2 * Copyright (C) 1995-2008 University of Karlsruhe. All right reserved.
4 * This file is part of libFirm.
6 * This file may be distributed and/or modified under the terms of the
7 * GNU General Public License version 2 as published by the Free Software
8 * Foundation and appearing in the file LICENSE.GPL included in the
9 * packaging of this file.
11 * Licensees holding valid libFirm Professional Edition licenses may use
12 * this file in accordance with the libFirm Commercial License.
13 * Agreement provided with the Software.
15 * This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
16 * WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * @brief iropt --- optimizations intertwined with IR construction.
23 * @author Christian Schaefer, Goetz Lindenmaier, Michael Beck
31 #include "irgraph_t.h"
32 #include "iredges_t.h"
39 #include "dbginfo_t.h"
40 #include "iropt_dbg.h"
45 #include "opt_confirms.h"
46 #include "opt_polymorphy.h"
51 /* Make types visible to allow most efficient access */
55 * Returns the tarval of a Const node or tarval_bad for all other nodes.
57 static tarval *default_value_of(const ir_node *n) {
59 return get_Const_tarval(n); /* might return tarval_bad */
64 value_of_func value_of_ptr = default_value_of;
66 /* * Set a new value_of function. */
67 void set_value_of_func(value_of_func func) {
71 value_of_ptr = default_value_of;
75 * Return the value of a Constant.
77 static tarval *computed_value_Const(const ir_node *n) {
78 return get_Const_tarval(n);
79 } /* computed_value_Const */
82 * Return the value of a 'sizeof', 'alignof' or 'offsetof' SymConst.
84 static tarval *computed_value_SymConst(const ir_node *n) {
88 switch (get_SymConst_kind(n)) {
89 case symconst_type_size:
90 type = get_SymConst_type(n);
91 if (get_type_state(type) == layout_fixed)
92 return new_tarval_from_long(get_type_size_bytes(type), get_irn_mode(n));
94 case symconst_type_align:
95 type = get_SymConst_type(n);
96 if (get_type_state(type) == layout_fixed)
97 return new_tarval_from_long(get_type_alignment_bytes(type), get_irn_mode(n));
99 case symconst_ofs_ent:
100 ent = get_SymConst_entity(n);
101 type = get_entity_owner(ent);
102 if (get_type_state(type) == layout_fixed)
103 return new_tarval_from_long(get_entity_offset(ent), get_irn_mode(n));
109 } /* computed_value_SymConst */
112 * Return the value of an Add.
114 static tarval *computed_value_Add(const ir_node *n) {
115 ir_node *a = get_Add_left(n);
116 ir_node *b = get_Add_right(n);
118 tarval *ta = value_of(a);
119 tarval *tb = value_of(b);
121 if ((ta != tarval_bad) && (tb != tarval_bad))
122 return tarval_add(ta, tb);
125 } /* computed_value_Add */
128 * Return the value of a Sub.
129 * Special case: a - a
131 static tarval *computed_value_Sub(const ir_node *n) {
132 ir_mode *mode = get_irn_mode(n);
133 ir_node *a = get_Sub_left(n);
134 ir_node *b = get_Sub_right(n);
139 if (! mode_is_float(mode)) {
142 return get_mode_null(mode);
148 if ((ta != tarval_bad) && (tb != tarval_bad))
149 return tarval_sub(ta, tb, mode);
152 } /* computed_value_Sub */
155 * Return the value of a Carry.
156 * Special : a op 0, 0 op b
158 static tarval *computed_value_Carry(const ir_node *n) {
159 ir_node *a = get_binop_left(n);
160 ir_node *b = get_binop_right(n);
161 ir_mode *m = get_irn_mode(n);
163 tarval *ta = value_of(a);
164 tarval *tb = value_of(b);
166 if ((ta != tarval_bad) && (tb != tarval_bad)) {
168 return tarval_carry() ? get_mode_one(m) : get_mode_null(m);
170 if (tarval_is_null(ta) || tarval_is_null(tb))
171 return get_mode_null(m);
174 } /* computed_value_Carry */
177 * Return the value of a Borrow.
180 static tarval *computed_value_Borrow(const ir_node *n) {
181 ir_node *a = get_binop_left(n);
182 ir_node *b = get_binop_right(n);
183 ir_mode *m = get_irn_mode(n);
185 tarval *ta = value_of(a);
186 tarval *tb = value_of(b);
188 if ((ta != tarval_bad) && (tb != tarval_bad)) {
189 return tarval_cmp(ta, tb) == pn_Cmp_Lt ? get_mode_one(m) : get_mode_null(m);
190 } else if (tarval_is_null(ta)) {
191 return get_mode_null(m);
194 } /* computed_value_Borrow */
197 * Return the value of an unary Minus.
199 static tarval *computed_value_Minus(const ir_node *n) {
200 ir_node *a = get_Minus_op(n);
201 tarval *ta = value_of(a);
203 if (ta != tarval_bad)
204 return tarval_neg(ta);
207 } /* computed_value_Minus */
210 * Return the value of a Mul.
212 static tarval *computed_value_Mul(const ir_node *n) {
213 ir_node *a = get_Mul_left(n);
214 ir_node *b = get_Mul_right(n);
217 tarval *ta = value_of(a);
218 tarval *tb = value_of(b);
220 mode = get_irn_mode(n);
221 if (mode != get_irn_mode(a)) {
222 /* n * n = 2n bit multiplication */
223 ta = tarval_convert_to(ta, mode);
224 tb = tarval_convert_to(tb, mode);
227 if (ta != tarval_bad && tb != tarval_bad) {
228 return tarval_mul(ta, tb);
230 /* a * 0 != 0 if a == NaN or a == Inf */
231 if (!mode_is_float(mode)) {
232 /* a*0 = 0 or 0*b = 0 */
233 if (ta == get_mode_null(mode))
235 if (tb == get_mode_null(mode))
240 } /* computed_value_Mul */
243 * Return the value of an Abs.
245 static tarval *computed_value_Abs(const ir_node *n) {
246 ir_node *a = get_Abs_op(n);
247 tarval *ta = value_of(a);
249 if (ta != tarval_bad)
250 return tarval_abs(ta);
253 } /* computed_value_Abs */
256 * Return the value of an And.
257 * Special case: a & 0, 0 & b
259 static tarval *computed_value_And(const ir_node *n) {
260 ir_node *a = get_And_left(n);
261 ir_node *b = get_And_right(n);
263 tarval *ta = value_of(a);
264 tarval *tb = value_of(b);
266 if ((ta != tarval_bad) && (tb != tarval_bad)) {
267 return tarval_and (ta, tb);
269 if (tarval_is_null(ta)) return ta;
270 if (tarval_is_null(tb)) return tb;
273 } /* computed_value_And */
276 * Return the value of an Or.
277 * Special case: a | 1...1, 1...1 | b
279 static tarval *computed_value_Or(const ir_node *n) {
280 ir_node *a = get_Or_left(n);
281 ir_node *b = get_Or_right(n);
283 tarval *ta = value_of(a);
284 tarval *tb = value_of(b);
286 if ((ta != tarval_bad) && (tb != tarval_bad)) {
287 return tarval_or (ta, tb);
289 if (tarval_is_all_one(ta)) return ta;
290 if (tarval_is_all_one(tb)) return tb;
293 } /* computed_value_Or */
296 * Return the value of an Eor.
298 static tarval *computed_value_Eor(const ir_node *n) {
299 ir_node *a = get_Eor_left(n);
300 ir_node *b = get_Eor_right(n);
305 return get_mode_null(get_irn_mode(n));
310 if ((ta != tarval_bad) && (tb != tarval_bad)) {
311 return tarval_eor (ta, tb);
314 } /* computed_value_Eor */
317 * Return the value of a Not.
319 static tarval *computed_value_Not(const ir_node *n) {
320 ir_node *a = get_Not_op(n);
321 tarval *ta = value_of(a);
323 if (ta != tarval_bad)
324 return tarval_not(ta);
327 } /* computed_value_Not */
330 * Return the value of a Shl.
332 static tarval *computed_value_Shl(const ir_node *n) {
333 ir_node *a = get_Shl_left(n);
334 ir_node *b = get_Shl_right(n);
336 tarval *ta = value_of(a);
337 tarval *tb = value_of(b);
339 if ((ta != tarval_bad) && (tb != tarval_bad)) {
340 return tarval_shl (ta, tb);
343 } /* computed_value_Shl */
346 * Return the value of a Shr.
348 static tarval *computed_value_Shr(const ir_node *n) {
349 ir_node *a = get_Shr_left(n);
350 ir_node *b = get_Shr_right(n);
352 tarval *ta = value_of(a);
353 tarval *tb = value_of(b);
355 if ((ta != tarval_bad) && (tb != tarval_bad)) {
356 return tarval_shr (ta, tb);
359 } /* computed_value_Shr */
362 * Return the value of a Shrs.
364 static tarval *computed_value_Shrs(const ir_node *n) {
365 ir_node *a = get_Shrs_left(n);
366 ir_node *b = get_Shrs_right(n);
368 tarval *ta = value_of(a);
369 tarval *tb = value_of(b);
371 if ((ta != tarval_bad) && (tb != tarval_bad)) {
372 return tarval_shrs (ta, tb);
375 } /* computed_value_Shrs */
378 * Return the value of a Rotl.
380 static tarval *computed_value_Rotl(const ir_node *n) {
381 ir_node *a = get_Rotl_left(n);
382 ir_node *b = get_Rotl_right(n);
384 tarval *ta = value_of(a);
385 tarval *tb = value_of(b);
387 if ((ta != tarval_bad) && (tb != tarval_bad)) {
388 return tarval_rotl(ta, tb);
391 } /* computed_value_Rotl */
394 * Return the value of a Conv.
396 static tarval *computed_value_Conv(const ir_node *n) {
397 ir_node *a = get_Conv_op(n);
398 tarval *ta = value_of(a);
400 if (ta != tarval_bad)
401 return tarval_convert_to(ta, get_irn_mode(n));
404 } /* computed_value_Conv */
407 * Calculate the value of a Mux: can be evaluated, if the
408 * sel and the right input are known.
410 static tarval *computed_value_Mux(const ir_node *n) {
411 ir_node *sel = get_Mux_sel(n);
412 tarval *ts = value_of(sel);
414 if (ts == get_tarval_b_true()) {
415 ir_node *v = get_Mux_true(n);
418 else if (ts == get_tarval_b_false()) {
419 ir_node *v = get_Mux_false(n);
423 } /* computed_value_Mux */
426 * Calculate the value of a Confirm: can be evaluated,
427 * if it has the form Confirm(x, '=', Const).
429 static tarval *computed_value_Confirm(const ir_node *n) {
431 * Beware: we might produce Phi(Confirm(x == true), Confirm(x == false)).
432 * Do NOT optimize them away (CondEval wants them), so wait until
433 * remove_confirm is activated.
435 if (get_opt_remove_confirm()) {
436 if (get_Confirm_cmp(n) == pn_Cmp_Eq) {
437 tarval *tv = value_of(get_Confirm_bound(n));
438 if (tv != tarval_bad)
442 return value_of(get_Confirm_value(n));
443 } /* computed_value_Confirm */
446 * Return the value of a Proj(Cmp).
448 * This performs a first step of unreachable code elimination.
449 * Proj can not be computed, but folding a Cmp above the Proj here is
450 * not as wasteful as folding a Cmp into a Tuple of 16 Consts of which
452 * There are several case where we can evaluate a Cmp node, see later.
454 static tarval *computed_value_Proj_Cmp(const ir_node *n) {
455 ir_node *a = get_Proj_pred(n);
456 ir_node *aa = get_Cmp_left(a);
457 ir_node *ab = get_Cmp_right(a);
458 long proj_nr = get_Proj_proj(n);
461 * BEWARE: a == a is NOT always True for floating Point values, as
462 * NaN != NaN is defined, so we must check this here.
465 !mode_is_float(get_irn_mode(aa)) || proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Gt)
468 /* This is a trick with the bits used for encoding the Cmp
469 Proj numbers, the following statement is not the same:
470 return new_tarval_from_long (proj_nr == pn_Cmp_Eq, mode_b) */
471 return new_tarval_from_long (proj_nr & pn_Cmp_Eq, mode_b);
474 tarval *taa = value_of(aa);
475 tarval *tab = value_of(ab);
476 ir_mode *mode = get_irn_mode(aa);
479 * The predecessors of Cmp are target values. We can evaluate
482 if ((taa != tarval_bad) && (tab != tarval_bad)) {
483 /* strange checks... */
484 pn_Cmp flags = tarval_cmp(taa, tab);
485 if (flags != pn_Cmp_False) {
486 return new_tarval_from_long (proj_nr & flags, mode_b);
489 /* for integer values, we can check against MIN/MAX */
490 else if (mode_is_int(mode)) {
491 /* MIN <=/> x. This results in true/false. */
492 if (taa == get_mode_min(mode)) {
493 /* a compare with the MIN value */
494 if (proj_nr == pn_Cmp_Le)
495 return get_tarval_b_true();
496 else if (proj_nr == pn_Cmp_Gt)
497 return get_tarval_b_false();
499 /* x >=/< MIN. This results in true/false. */
501 if (tab == get_mode_min(mode)) {
502 /* a compare with the MIN value */
503 if (proj_nr == pn_Cmp_Ge)
504 return get_tarval_b_true();
505 else if (proj_nr == pn_Cmp_Lt)
506 return get_tarval_b_false();
508 /* MAX >=/< x. This results in true/false. */
509 else if (taa == get_mode_max(mode)) {
510 if (proj_nr == pn_Cmp_Ge)
511 return get_tarval_b_true();
512 else if (proj_nr == pn_Cmp_Lt)
513 return get_tarval_b_false();
515 /* x <=/> MAX. This results in true/false. */
516 else if (tab == get_mode_max(mode)) {
517 if (proj_nr == pn_Cmp_Le)
518 return get_tarval_b_true();
519 else if (proj_nr == pn_Cmp_Gt)
520 return get_tarval_b_false();
524 * The predecessors are Allocs or (void*)(0) constants. Allocs never
525 * return NULL, they raise an exception. Therefore we can predict
529 ir_node *aaa = skip_Proj(aa);
530 ir_node *aba = skip_Proj(ab);
532 if ( ( (/* aa is ProjP and aaa is Alloc */
534 && mode_is_reference(get_irn_mode(aa))
536 && ( (/* ab is NULL */
537 mode_is_reference(get_irn_mode(ab))
538 && tarval_is_null(tab))
539 || (/* ab is other Alloc */
541 && mode_is_reference(get_irn_mode(ab))
544 || (/* aa is NULL and aba is Alloc */
545 mode_is_reference(get_irn_mode(aa))
546 && tarval_is_null(taa)
548 && mode_is_reference(get_irn_mode(ab))
551 return new_tarval_from_long(proj_nr & pn_Cmp_Lg, mode_b);
554 return computed_value_Cmp_Confirm(a, aa, ab, proj_nr);
555 } /* computed_value_Proj_Cmp */
558 * Return the value of a floating point Quot.
560 static tarval *do_computed_value_Quot(const ir_node *a, const ir_node *b) {
561 tarval *ta = value_of(a);
562 tarval *tb = value_of(b);
564 /* cannot optimize 0 / b = 0 because of NaN */
565 if (ta != tarval_bad && tb != tarval_bad)
566 return tarval_quo(ta, tb);
568 } /* do_computed_value_Quot */
571 * Calculate the value of an integer Div of two nodes.
572 * Special case: 0 / b
574 static tarval *do_computed_value_Div(const ir_node *a, const ir_node *b) {
575 tarval *ta = value_of(a);
577 const ir_node *dummy;
579 /* Compute c1 / c2 or 0 / a, a != 0 */
580 if (tarval_is_null(ta) && value_not_zero(b, &dummy))
581 return ta; /* 0 / b == 0 */
583 if (ta != tarval_bad && tb != tarval_bad)
584 return tarval_div(ta, tb);
586 } /* do_computed_value_Div */
589 * Calculate the value of an integer Mod of two nodes.
590 * Special case: a % 1
592 static tarval *do_computed_value_Mod(const ir_node *a, const ir_node *b) {
593 tarval *ta = value_of(a);
594 tarval *tb = value_of(b);
596 /* Compute a % 1 or c1 % c2 */
597 if (tarval_is_one(tb))
598 return get_mode_null(get_irn_mode(a));
599 if (ta != tarval_bad && tb != tarval_bad)
600 return tarval_mod(ta, tb);
602 } /* do_computed_value_Mod */
605 * Return the value of a Proj(DivMod).
607 static tarval *computed_value_Proj_DivMod(const ir_node *n) {
608 long proj_nr = get_Proj_proj(n);
610 /* compute either the Div or the Mod part */
611 if (proj_nr == pn_DivMod_res_div) {
612 const ir_node *a = get_Proj_pred(n);
613 return do_computed_value_Div(get_DivMod_left(a), get_DivMod_right(a));
614 } else if (proj_nr == pn_DivMod_res_mod) {
615 const ir_node *a = get_Proj_pred(n);
616 return do_computed_value_Mod(get_DivMod_left(a), get_DivMod_right(a));
619 } /* computed_value_Proj_DivMod */
622 * Return the value of a Proj(Div).
624 static tarval *computed_value_Proj_Div(const ir_node *n) {
625 long proj_nr = get_Proj_proj(n);
627 if (proj_nr == pn_Div_res) {
628 const ir_node *a = get_Proj_pred(n);
629 return do_computed_value_Div(get_Div_left(a), get_Div_right(a));
632 } /* computed_value_Proj_Div */
635 * Return the value of a Proj(Mod).
637 static tarval *computed_value_Proj_Mod(const ir_node *n) {
638 long proj_nr = get_Proj_proj(n);
640 if (proj_nr == pn_Mod_res) {
641 const ir_node *a = get_Proj_pred(n);
642 return do_computed_value_Mod(get_Mod_left(a), get_Mod_right(a));
645 } /* computed_value_Proj_Mod */
648 * Return the value of a Proj(Quot).
650 static tarval *computed_value_Proj_Quot(const ir_node *n) {
651 long proj_nr = get_Proj_proj(n);
653 if (proj_nr == pn_Quot_res) {
654 const ir_node *a = get_Proj_pred(n);
655 return do_computed_value_Quot(get_Quot_left(a), get_Quot_right(a));
658 } /* computed_value_Proj_Quot */
661 * Return the value of a Proj.
663 static tarval *computed_value_Proj(const ir_node *proj) {
664 ir_node *n = get_Proj_pred(proj);
666 if (n->op->ops.computed_value_Proj != NULL)
667 return n->op->ops.computed_value_Proj(proj);
669 } /* computed_value_Proj */
672 * If the parameter n can be computed, return its value, else tarval_bad.
673 * Performs constant folding.
675 * @param n The node this should be evaluated
677 tarval *computed_value(const ir_node *n) {
678 if (n->op->ops.computed_value)
679 return n->op->ops.computed_value(n);
681 } /* computed_value */
684 * Set the default computed_value evaluator in an ir_op_ops.
686 * @param code the opcode for the default operation
687 * @param ops the operations initialized
692 static ir_op_ops *firm_set_default_computed_value(ir_opcode code, ir_op_ops *ops)
696 ops->computed_value = computed_value_##a; \
698 #define CASE_PROJ(a) \
700 ops->computed_value_Proj = computed_value_Proj_##a; \
737 } /* firm_set_default_computed_value */
740 * Returns a equivalent block for another block.
741 * If the block has only one predecessor, this is
742 * the equivalent one. If the only predecessor of a block is
743 * the block itself, this is a dead block.
745 * If both predecessors of a block are the branches of a binary
746 * Cond, the equivalent block is Cond's block.
748 * If all predecessors of a block are bad or lies in a dead
749 * block, the current block is dead as well.
751 * Note, that blocks are NEVER turned into Bad's, instead
752 * the dead_block flag is set. So, never test for is_Bad(block),
753 * always use is_dead_Block(block).
755 static ir_node *equivalent_node_Block(ir_node *n)
760 /* don't optimize dead or labeled blocks */
761 if (is_Block_dead(n) || has_Block_label(n))
764 n_preds = get_Block_n_cfgpreds(n);
766 /* The Block constructor does not call optimize, but mature_immBlock()
767 calls the optimization. */
768 assert(get_Block_matured(n));
770 /* Straightening: a single entry Block following a single exit Block
771 can be merged, if it is not the Start block. */
772 /* !!! Beware, all Phi-nodes of n must have been optimized away.
773 This should be true, as the block is matured before optimize is called.
774 But what about Phi-cycles with the Phi0/Id that could not be resolved?
775 Remaining Phi nodes are just Ids. */
777 ir_node *pred = skip_Proj(get_Block_cfgpred(n, 0));
780 ir_node *predblock = get_nodes_block(pred);
781 if (predblock == oldn) {
782 /* Jmp jumps into the block it is in -- deal self cycle. */
783 n = set_Block_dead(n);
784 DBG_OPT_DEAD_BLOCK(oldn, n);
785 } else if (get_opt_control_flow_straightening()) {
787 DBG_OPT_STG(oldn, n);
789 } else if (is_Cond(pred)) {
790 ir_node *predblock = get_nodes_block(pred);
791 if (predblock == oldn) {
792 /* Jmp jumps into the block it is in -- deal self cycle. */
793 n = set_Block_dead(n);
794 DBG_OPT_DEAD_BLOCK(oldn, n);
797 } else if ((n_preds == 2) &&
798 (get_opt_control_flow_weak_simplification())) {
799 /* Test whether Cond jumps twice to this block
800 * The more general case which more than 2 predecessors is handles
801 * in optimize_cf(), we handle only this special case for speed here.
803 ir_node *a = get_Block_cfgpred(n, 0);
804 ir_node *b = get_Block_cfgpred(n, 1);
806 if (is_Proj(a) && is_Proj(b)) {
807 ir_node *cond = get_Proj_pred(a);
809 if (cond == get_Proj_pred(b) && is_Cond(cond) &&
810 get_irn_mode(get_Cond_selector(cond)) == mode_b) {
811 /* Also a single entry Block following a single exit Block. Phis have
812 twice the same operand and will be optimized away. */
813 n = get_nodes_block(cond);
814 DBG_OPT_IFSIM1(oldn, a, b, n);
817 } else if (get_opt_unreachable_code() &&
818 (n != get_irg_start_block(current_ir_graph)) &&
819 (n != get_irg_end_block(current_ir_graph)) ) {
822 /* If all inputs are dead, this block is dead too, except if it is
823 the start or end block. This is one step of unreachable code
825 for (i = get_Block_n_cfgpreds(n) - 1; i >= 0; --i) {
826 ir_node *pred = get_Block_cfgpred(n, i);
829 if (is_Bad(pred)) continue;
830 pred_blk = get_nodes_block(skip_Proj(pred));
832 if (is_Block_dead(pred_blk)) continue;
835 /* really found a living input */
840 n = set_Block_dead(n);
841 DBG_OPT_DEAD_BLOCK(oldn, n);
846 } /* equivalent_node_Block */
849 * Returns a equivalent node for a Jmp, a Bad :-)
850 * Of course this only happens if the Block of the Jmp is dead.
852 static ir_node *equivalent_node_Jmp(ir_node *n) {
855 /* unreachable code elimination */
856 if (is_Block_dead(get_nodes_block(n))) {
857 n = get_irg_bad(current_ir_graph);
858 DBG_OPT_DEAD_BLOCK(oldn, n);
861 } /* equivalent_node_Jmp */
863 /** Raise is handled in the same way as Jmp. */
864 #define equivalent_node_Raise equivalent_node_Jmp
867 /* We do not evaluate Cond here as we replace it by a new node, a Jmp.
868 See transform_node_Proj_Cond(). */
871 * Optimize operations that are commutative and have neutral 0,
872 * so a op 0 = 0 op a = a.
874 static ir_node *equivalent_node_neutral_zero(ir_node *n) {
877 ir_node *a = get_binop_left(n);
878 ir_node *b = get_binop_right(n);
883 /* After running compute_node there is only one constant predecessor.
884 Find this predecessors value and remember the other node: */
885 if ((tv = value_of(a)) != tarval_bad) {
887 } else if ((tv = value_of(b)) != tarval_bad) {
892 /* If this predecessors constant value is zero, the operation is
893 * unnecessary. Remove it.
895 * Beware: If n is a Add, the mode of on and n might be different
896 * which happens in this rare construction: NULL + 3.
897 * Then, a Conv would be needed which we cannot include here.
899 if (tarval_is_null(tv) && get_irn_mode(on) == get_irn_mode(n)) {
902 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_0);
906 } /* equivalent_node_neutral_zero */
909 * Eor is commutative and has neutral 0.
911 static ir_node *equivalent_node_Eor(ir_node *n) {
916 n = equivalent_node_neutral_zero(n);
917 if (n != oldn) return n;
920 b = get_Eor_right(n);
923 ir_node *aa = get_Eor_left(a);
924 ir_node *ab = get_Eor_right(a);
927 /* (a ^ b) ^ a -> b */
929 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
931 } else if (ab == b) {
932 /* (a ^ b) ^ b -> a */
934 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
939 ir_node *ba = get_Eor_left(b);
940 ir_node *bb = get_Eor_right(b);
943 /* a ^ (a ^ b) -> b */
945 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
947 } else if (bb == a) {
948 /* a ^ (b ^ a) -> b */
950 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
958 * Optimize a - 0 and (a - x) + x (for modes with wrap-around).
960 * The second one looks strange, but this construct
961 * is used heavily in the LCC sources :-).
963 * Beware: The Mode of an Add may be different than the mode of its
964 * predecessors, so we could not return a predecessors in all cases.
966 static ir_node *equivalent_node_Add(ir_node *n) {
968 ir_node *left, *right;
969 ir_mode *mode = get_irn_mode(n);
971 n = equivalent_node_neutral_zero(n);
975 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
976 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
979 left = get_Add_left(n);
980 right = get_Add_right(n);
983 if (get_Sub_right(left) == right) {
986 n = get_Sub_left(left);
987 if (mode == get_irn_mode(n)) {
988 DBG_OPT_ALGSIM1(oldn, left, right, n, FS_OPT_ADD_SUB);
994 if (get_Sub_right(right) == left) {
997 n = get_Sub_left(right);
998 if (mode == get_irn_mode(n)) {
999 DBG_OPT_ALGSIM1(oldn, left, right, n, FS_OPT_ADD_SUB);
1005 } /* equivalent_node_Add */
1008 * optimize operations that are not commutative but have neutral 0 on left,
1011 static ir_node *equivalent_node_left_zero(ir_node *n) {
1014 ir_node *a = get_binop_left(n);
1015 ir_node *b = get_binop_right(n);
1016 tarval *tb = value_of(b);
1018 if (tarval_is_null(tb)) {
1021 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_0);
1024 } /* equivalent_node_left_zero */
1026 #define equivalent_node_Shl equivalent_node_left_zero
1027 #define equivalent_node_Shr equivalent_node_left_zero
1028 #define equivalent_node_Shrs equivalent_node_left_zero
1029 #define equivalent_node_Rotl equivalent_node_left_zero
1032 * Optimize a - 0 and (a + x) - x (for modes with wrap-around).
1034 * The second one looks strange, but this construct
1035 * is used heavily in the LCC sources :-).
1037 * Beware: The Mode of a Sub may be different than the mode of its
1038 * predecessors, so we could not return a predecessors in all cases.
1040 static ir_node *equivalent_node_Sub(ir_node *n) {
1043 ir_mode *mode = get_irn_mode(n);
1046 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
1047 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
1050 b = get_Sub_right(n);
1053 /* Beware: modes might be different */
1054 if (tarval_is_null(tb)) {
1055 ir_node *a = get_Sub_left(n);
1056 if (mode == get_irn_mode(a)) {
1059 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_0);
1063 } /* equivalent_node_Sub */
1067 * Optimize an "self-inverse unary op", ie op(op(n)) = n.
1070 * -(-a) == a, but might overflow two times.
1071 * We handle it anyway here but the better way would be a
1072 * flag. This would be needed for Pascal for instance.
1074 static ir_node *equivalent_node_idempotent_unop(ir_node *n) {
1076 ir_node *pred = get_unop_op(n);
1078 /* optimize symmetric unop */
1079 if (get_irn_op(pred) == get_irn_op(n)) {
1080 n = get_unop_op(pred);
1081 DBG_OPT_ALGSIM2(oldn, pred, n, FS_OPT_IDEM_UNARY);
1084 } /* equivalent_node_idempotent_unop */
1086 /** Optimize Not(Not(x)) == x. */
1087 #define equivalent_node_Not equivalent_node_idempotent_unop
1089 /** -(-x) == x ??? Is this possible or can --x raise an
1090 out of bounds exception if min =! max? */
1091 #define equivalent_node_Minus equivalent_node_idempotent_unop
1094 * Optimize a * 1 = 1 * a = a.
1096 static ir_node *equivalent_node_Mul(ir_node *n) {
1098 ir_node *a = get_Mul_left(n);
1100 /* we can handle here only the n * n = n bit cases */
1101 if (get_irn_mode(n) == get_irn_mode(a)) {
1102 ir_node *b = get_Mul_right(n);
1106 * Mul is commutative and has again an other neutral element.
1107 * Constants are place right, so check this case first.
1110 if (tarval_is_one(tv)) {
1112 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
1115 if (tarval_is_one(tv)) {
1117 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
1122 } /* equivalent_node_Mul */
1125 * Use algebraic simplification a | a = a | 0 = 0 | a = a.
1127 static ir_node *equivalent_node_Or(ir_node *n) {
1130 ir_node *a = get_Or_left(n);
1131 ir_node *b = get_Or_right(n);
1135 n = a; /* Or has it's own neutral element */
1136 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_OR);
1139 /* constants are cormalized to right, check this site first */
1141 if (tarval_is_null(tv)) {
1143 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_OR);
1147 if (tarval_is_null(tv)) {
1149 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_OR);
1154 } /* equivalent_node_Or */
1157 * Optimize a & 0b1...1 = 0b1...1 & a = a & a = (a|X) & a = a.
1159 static ir_node *equivalent_node_And(ir_node *n) {
1162 ir_node *a = get_And_left(n);
1163 ir_node *b = get_And_right(n);
1167 n = a; /* And has it's own neutral element */
1168 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_AND);
1171 /* constants are normalized to right, check this site first */
1173 if (tarval_is_all_one(tv)) {
1175 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1178 if (tv != get_tarval_bad()) {
1179 ir_mode *mode = get_irn_mode(n);
1180 if (!mode_is_signed(mode) && is_Conv(a)) {
1181 ir_node *convop = get_Conv_op(a);
1182 ir_mode *convopmode = get_irn_mode(convop);
1183 if (!mode_is_signed(convopmode)) {
1184 if (tarval_is_all_one(tarval_convert_to(tv, convopmode))) {
1185 /* Conv(X) & all_one(mode(X)) = Conv(X) */
1187 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1194 if (tarval_is_all_one(tv)) {
1196 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1200 if (b == get_Or_left(a) || b == get_Or_right(a)) {
1203 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1208 if (a == get_Or_left(b) || a == get_Or_right(b)) {
1211 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1216 } /* equivalent_node_And */
1219 * Try to remove useless Conv's:
1221 static ir_node *equivalent_node_Conv(ir_node *n) {
1223 ir_node *a = get_Conv_op(n);
1225 ir_mode *n_mode = get_irn_mode(n);
1226 ir_mode *a_mode = get_irn_mode(a);
1229 if (n_mode == a_mode) { /* No Conv necessary */
1230 if (get_Conv_strict(n)) {
1233 /* neither Minus nor Abs nor Confirm change the precision,
1234 so we can "look-through" */
1237 p = get_Minus_op(p);
1238 } else if (is_Abs(p)) {
1240 } else if (is_Confirm(p)) {
1241 p = get_Confirm_value(p);
1247 if (is_Conv(p) && get_Conv_strict(p)) {
1248 /* we known already, that a_mode == n_mode, and neither
1249 Abs nor Minus change the mode, so the second Conv
1251 assert(get_irn_mode(p) == n_mode);
1253 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
1257 ir_node *pred = get_Proj_pred(p);
1258 if (is_Load(pred)) {
1259 /* Loads always return with the exact precision of n_mode */
1260 assert(get_Load_mode(pred) == n_mode);
1262 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
1265 if (is_Proj(pred) && get_Proj_proj(pred) == pn_Start_T_args) {
1266 pred = get_Proj_pred(pred);
1267 if (is_Start(pred)) {
1268 /* Arguments always return with the exact precision,
1269 as strictConv's are place before Call -- if the
1270 caller was compiled with the same setting.
1271 Otherwise, the semantics is probably still right. */
1272 assert(get_irn_mode(p) == n_mode);
1274 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
1280 /* special case: the immediate predecessor is also a Conv */
1281 if (! get_Conv_strict(a)) {
1282 /* first one is not strict, kick it */
1284 a_mode = get_irn_mode(a);
1288 /* else both are strict conv, second is superfluous */
1290 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
1295 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
1298 } else if (is_Conv(a)) { /* Conv(Conv(b)) */
1299 ir_node *b = get_Conv_op(a);
1300 ir_mode *b_mode = get_irn_mode(b);
1302 if (get_Conv_strict(n) && get_Conv_strict(a)) {
1303 /* both are strict conv */
1304 if (smaller_mode(a_mode, n_mode)) {
1305 /* both are strict, but the first is smaller, so
1306 the second cannot remove more precision, remove the
1308 set_Conv_strict(n, 0);
1311 if (n_mode == b_mode) {
1312 if (! get_Conv_strict(n) && ! get_Conv_strict(a)) {
1313 if (n_mode == mode_b) {
1314 n = b; /* Convb(Conv*(xxxb(...))) == xxxb(...) */
1315 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1317 } else if (get_mode_arithmetic(n_mode) == get_mode_arithmetic(a_mode)) {
1318 if (values_in_mode(b_mode, a_mode)) {
1319 n = b; /* ConvS(ConvL(xxxS(...))) == xxxS(...) */
1320 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1325 if (mode_is_int(n_mode) && get_mode_arithmetic(a_mode) == irma_ieee754) {
1326 /* ConvI(ConvF(I)) -> I, iff float mantissa >= int mode */
1327 unsigned int_mantissa = get_mode_size_bits(n_mode) - (mode_is_signed(n_mode) ? 1 : 0);
1328 unsigned float_mantissa = tarval_ieee754_get_mantissa_size(a_mode);
1330 if (float_mantissa >= int_mantissa) {
1332 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1337 if (smaller_mode(b_mode, a_mode)) {
1338 if (get_Conv_strict(n))
1339 set_Conv_strict(b, 1);
1340 n = b; /* ConvA(ConvB(ConvA(...))) == ConvA(...) */
1341 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1348 } /* equivalent_node_Conv */
1351 * A Cast may be removed if the type of the previous node
1352 * is already the type of the Cast.
1354 static ir_node *equivalent_node_Cast(ir_node *n) {
1356 ir_node *pred = get_Cast_op(n);
1358 if (get_irn_type(pred) == get_Cast_type(n)) {
1360 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CAST);
1363 } /* equivalent_node_Cast */
1366 * - fold Phi-nodes, iff they have only one predecessor except
1369 static ir_node *equivalent_node_Phi(ir_node *n) {
1374 ir_node *first_val = NULL; /* to shutup gcc */
1376 if (!get_opt_normalize()) return n;
1378 n_preds = get_Phi_n_preds(n);
1380 block = get_nodes_block(n);
1381 if (is_Block_dead(block)) /* Control dead */
1382 return get_irg_bad(current_ir_graph);
1384 if (n_preds == 0) return n; /* Phi of dead Region without predecessors. */
1386 /* Find first non-self-referencing input */
1387 for (i = 0; i < n_preds; ++i) {
1388 first_val = get_Phi_pred(n, i);
1389 if ( (first_val != n) /* not self pointer */
1391 /* BEWARE: when the if is changed to 1, Phi's will ignore it's Bad
1392 * predecessors. Then, Phi nodes in dead code might be removed, causing
1393 * nodes pointing to themself (Add's for instance).
1394 * This is really bad and causes endless recursions in several
1395 * code pathes, so we do NOT optimize such a code.
1396 * This is not that bad as it sounds, optimize_cf() removes bad control flow
1397 * (and bad Phi predecessors), so live code is optimized later.
1399 && (! is_Bad(get_Block_cfgpred(block, i)))
1401 ) { /* value not dead */
1402 break; /* then found first value. */
1407 /* A totally Bad or self-referencing Phi (we didn't break the above loop) */
1408 return get_irg_bad(current_ir_graph);
1411 /* search for rest of inputs, determine if any of these
1412 are non-self-referencing */
1413 while (++i < n_preds) {
1414 ir_node *scnd_val = get_Phi_pred(n, i);
1415 if ( (scnd_val != n)
1416 && (scnd_val != first_val)
1419 && (! is_Bad(get_Block_cfgpred(block, i)))
1427 /* Fold, if no multiple distinct non-self-referencing inputs */
1429 DBG_OPT_PHI(oldn, n);
1432 } /* equivalent_node_Phi */
1435 * Several optimizations:
1436 * - fold Sync-nodes, iff they have only one predecessor except
1439 static ir_node *equivalent_node_Sync(ir_node *n) {
1440 int arity = get_Sync_n_preds(n);
1443 for (i = 0; i < arity;) {
1444 ir_node *pred = get_Sync_pred(n, i);
1447 /* Remove Bad predecessors */
1454 /* Remove duplicate predecessors */
1460 if (get_Sync_pred(n, j) == pred) {
1468 if (arity == 0) return get_irg_bad(current_ir_graph);
1469 if (arity == 1) return get_Sync_pred(n, 0);
1471 } /* equivalent_node_Sync */
1474 * Optimize Proj(Tuple).
1476 static ir_node *equivalent_node_Proj_Tuple(ir_node *proj) {
1477 ir_node *oldn = proj;
1478 ir_node *tuple = get_Proj_pred(proj);
1480 /* Remove the Tuple/Proj combination. */
1481 proj = get_Tuple_pred(tuple, get_Proj_proj(proj));
1482 DBG_OPT_TUPLE(oldn, tuple, proj);
1485 } /* equivalent_node_Proj_Tuple */
1488 * Optimize a / 1 = a.
1490 static ir_node *equivalent_node_Proj_Div(ir_node *proj) {
1491 ir_node *oldn = proj;
1492 ir_node *div = get_Proj_pred(proj);
1493 ir_node *b = get_Div_right(div);
1494 tarval *tb = value_of(b);
1496 /* Div is not commutative. */
1497 if (tarval_is_one(tb)) { /* div(x, 1) == x */
1498 switch (get_Proj_proj(proj)) {
1500 proj = get_Div_mem(div);
1501 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1505 proj = get_Div_left(div);
1506 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1510 /* we cannot replace the exception Proj's here, this is done in
1511 transform_node_Proj_Div() */
1516 } /* equivalent_node_Proj_Div */
1519 * Optimize a / 1.0 = a.
1521 static ir_node *equivalent_node_Proj_Quot(ir_node *proj) {
1522 ir_node *oldn = proj;
1523 ir_node *quot = get_Proj_pred(proj);
1524 ir_node *b = get_Quot_right(quot);
1525 tarval *tb = value_of(b);
1527 /* Div is not commutative. */
1528 if (tarval_is_one(tb)) { /* Quot(x, 1) == x */
1529 switch (get_Proj_proj(proj)) {
1531 proj = get_Quot_mem(quot);
1532 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1536 proj = get_Quot_left(quot);
1537 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1541 /* we cannot replace the exception Proj's here, this is done in
1542 transform_node_Proj_Quot() */
1547 } /* equivalent_node_Proj_Quot */
1550 * Optimize a / 1 = a.
1552 static ir_node *equivalent_node_Proj_DivMod(ir_node *proj) {
1553 ir_node *oldn = proj;
1554 ir_node *divmod = get_Proj_pred(proj);
1555 ir_node *b = get_DivMod_right(divmod);
1556 tarval *tb = value_of(b);
1558 /* Div is not commutative. */
1559 if (tarval_is_one(tb)) { /* div(x, 1) == x */
1560 switch (get_Proj_proj(proj)) {
1562 proj = get_DivMod_mem(divmod);
1563 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1566 case pn_DivMod_res_div:
1567 proj = get_DivMod_left(divmod);
1568 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1572 /* we cannot replace the exception Proj's here, this is done in
1573 transform_node_Proj_DivMod().
1574 Note further that the pn_DivMod_res_div case is handled in
1575 computed_value_Proj(). */
1580 } /* equivalent_node_Proj_DivMod */
1583 * Optimize CopyB(mem, x, x) into a Nop.
1585 static ir_node *equivalent_node_Proj_CopyB(ir_node *proj) {
1586 ir_node *oldn = proj;
1587 ir_node *copyb = get_Proj_pred(proj);
1588 ir_node *a = get_CopyB_dst(copyb);
1589 ir_node *b = get_CopyB_src(copyb);
1592 /* Turn CopyB into a tuple (mem, jmp, bad, bad) */
1593 switch (get_Proj_proj(proj)) {
1594 case pn_CopyB_M_regular:
1595 proj = get_CopyB_mem(copyb);
1596 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
1599 case pn_CopyB_M_except:
1600 case pn_CopyB_X_except:
1601 DBG_OPT_EXC_REM(proj);
1602 proj = get_irg_bad(current_ir_graph);
1607 } /* equivalent_node_Proj_CopyB */
1610 * Optimize Bounds(idx, idx, upper) into idx.
1612 static ir_node *equivalent_node_Proj_Bound(ir_node *proj) {
1613 ir_node *oldn = proj;
1614 ir_node *bound = get_Proj_pred(proj);
1615 ir_node *idx = get_Bound_index(bound);
1616 ir_node *pred = skip_Proj(idx);
1619 if (idx == get_Bound_lower(bound))
1621 else if (is_Bound(pred)) {
1623 * idx was Bounds checked in the same MacroBlock previously,
1624 * it is still valid if lower <= pred_lower && pred_upper <= upper.
1626 ir_node *lower = get_Bound_lower(bound);
1627 ir_node *upper = get_Bound_upper(bound);
1628 if (get_Bound_lower(pred) == lower &&
1629 get_Bound_upper(pred) == upper &&
1630 get_irn_MacroBlock(bound) == get_irn_MacroBlock(pred)) {
1632 * One could expect that we simply return the previous
1633 * Bound here. However, this would be wrong, as we could
1634 * add an exception Proj to a new location then.
1635 * So, we must turn in into a tuple.
1641 /* Turn Bound into a tuple (mem, jmp, bad, idx) */
1642 switch (get_Proj_proj(proj)) {
1644 DBG_OPT_EXC_REM(proj);
1645 proj = get_Bound_mem(bound);
1647 case pn_Bound_X_except:
1648 DBG_OPT_EXC_REM(proj);
1649 proj = get_irg_bad(current_ir_graph);
1653 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
1656 /* cannot optimize pn_Bound_X_regular, handled in transform ... */
1661 } /* equivalent_node_Proj_Bound */
1664 * Optimize an Exception Proj(Load) with a non-null address.
1666 static ir_node *equivalent_node_Proj_Load(ir_node *proj) {
1667 if (get_opt_ldst_only_null_ptr_exceptions()) {
1668 if (get_irn_mode(proj) == mode_X) {
1669 ir_node *load = get_Proj_pred(proj);
1671 /* get the Load address */
1672 const ir_node *addr = get_Load_ptr(load);
1673 const ir_node *confirm;
1675 if (value_not_null(addr, &confirm)) {
1676 if (get_Proj_proj(proj) == pn_Load_X_except) {
1677 DBG_OPT_EXC_REM(proj);
1678 return get_irg_bad(current_ir_graph);
1684 } /* equivalent_node_Proj_Load */
1687 * Optimize an Exception Proj(Store) with a non-null address.
1689 static ir_node *equivalent_node_Proj_Store(ir_node *proj) {
1690 if (get_opt_ldst_only_null_ptr_exceptions()) {
1691 if (get_irn_mode(proj) == mode_X) {
1692 ir_node *store = get_Proj_pred(proj);
1694 /* get the load/store address */
1695 const ir_node *addr = get_Store_ptr(store);
1696 const ir_node *confirm;
1698 if (value_not_null(addr, &confirm)) {
1699 if (get_Proj_proj(proj) == pn_Store_X_except) {
1700 DBG_OPT_EXC_REM(proj);
1701 return get_irg_bad(current_ir_graph);
1707 } /* equivalent_node_Proj_Store */
1710 * Does all optimizations on nodes that must be done on it's Proj's
1711 * because of creating new nodes.
1713 static ir_node *equivalent_node_Proj(ir_node *proj) {
1714 ir_node *n = get_Proj_pred(proj);
1716 if (get_irn_mode(proj) == mode_X) {
1717 if (is_Block_dead(get_nodes_block(n))) {
1718 /* Remove dead control flow -- early gigo(). */
1719 return get_irg_bad(current_ir_graph);
1722 if (n->op->ops.equivalent_node_Proj)
1723 return n->op->ops.equivalent_node_Proj(proj);
1725 } /* equivalent_node_Proj */
1730 static ir_node *equivalent_node_Id(ir_node *n) {
1737 DBG_OPT_ID(oldn, n);
1739 } /* equivalent_node_Id */
1744 static ir_node *equivalent_node_Mux(ir_node *n)
1746 ir_node *oldn = n, *sel = get_Mux_sel(n);
1748 tarval *ts = value_of(sel);
1750 /* Mux(true, f, t) == t */
1751 if (ts == tarval_b_true) {
1752 n = get_Mux_true(n);
1753 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_C);
1756 /* Mux(false, f, t) == f */
1757 if (ts == tarval_b_false) {
1758 n = get_Mux_false(n);
1759 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_C);
1762 n_t = get_Mux_true(n);
1763 n_f = get_Mux_false(n);
1765 /* Mux(v, x, T) == x */
1766 if (is_Unknown(n_f)) {
1768 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_EQ);
1771 /* Mux(v, T, x) == x */
1772 if (is_Unknown(n_t)) {
1774 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_EQ);
1778 /* Mux(v, x, x) == x */
1781 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_EQ);
1784 if (is_Proj(sel) && !mode_honor_signed_zeros(get_irn_mode(n))) {
1785 ir_node *cmp = get_Proj_pred(sel);
1786 long proj_nr = get_Proj_proj(sel);
1787 ir_node *f = get_Mux_false(n);
1788 ir_node *t = get_Mux_true(n);
1791 * Note further that these optimization work even for floating point
1792 * with NaN's because -NaN == NaN.
1793 * However, if +0 and -0 is handled differently, we cannot use the first one.
1796 ir_node *const cmp_l = get_Cmp_left(cmp);
1797 ir_node *const cmp_r = get_Cmp_right(cmp);
1801 if ((cmp_l == t && cmp_r == f) || /* Mux(t == f, t, f) -> f */
1802 (cmp_l == f && cmp_r == t)) { /* Mux(f == t, t, f) -> f */
1804 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1811 if ((cmp_l == t && cmp_r == f) || /* Mux(t != f, t, f) -> t */
1812 (cmp_l == f && cmp_r == t)) { /* Mux(f != t, t, f) -> t */
1814 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1821 * Note: normalization puts the constant on the right side,
1822 * so we check only one case.
1824 if (cmp_l == t && tarval_is_null(value_of(cmp_r))) {
1825 /* Mux(t CMP 0, X, t) */
1826 if (is_Minus(f) && get_Minus_op(f) == t) {
1827 /* Mux(t CMP 0, -t, t) */
1828 if (proj_nr == pn_Cmp_Eq) {
1829 /* Mux(t == 0, -t, t) ==> -t */
1831 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1832 } else if (proj_nr == pn_Cmp_Lg || proj_nr == pn_Cmp_Ne) {
1833 /* Mux(t != 0, -t, t) ==> t */
1835 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1842 } /* equivalent_node_Mux */
1845 * Remove Confirm nodes if setting is on.
1846 * Replace Confirms(x, '=', Constlike) by Constlike.
1848 static ir_node *equivalent_node_Confirm(ir_node *n) {
1849 ir_node *pred = get_Confirm_value(n);
1850 pn_Cmp pnc = get_Confirm_cmp(n);
1852 while (is_Confirm(pred) && pnc == get_Confirm_cmp(pred)) {
1854 * rare case: two identical Confirms one after another,
1855 * replace the second one with the first.
1858 pred = get_Confirm_value(n);
1859 pnc = get_Confirm_cmp(n);
1861 if (get_opt_remove_confirm())
1862 return get_Confirm_value(n);
1867 * equivalent_node() returns a node equivalent to input n. It skips all nodes that
1868 * perform no actual computation, as, e.g., the Id nodes. It does not create
1869 * new nodes. It is therefore safe to free n if the node returned is not n.
1870 * If a node returns a Tuple we can not just skip it. If the size of the
1871 * in array fits, we transform n into a tuple (e.g., Div).
1873 ir_node *equivalent_node(ir_node *n) {
1874 if (n->op->ops.equivalent_node)
1875 return n->op->ops.equivalent_node(n);
1877 } /* equivalent_node */
1880 * Sets the default equivalent node operation for an ir_op_ops.
1882 * @param code the opcode for the default operation
1883 * @param ops the operations initialized
1888 static ir_op_ops *firm_set_default_equivalent_node(ir_opcode code, ir_op_ops *ops)
1892 ops->equivalent_node = equivalent_node_##a; \
1894 #define CASE_PROJ(a) \
1896 ops->equivalent_node_Proj = equivalent_node_Proj_##a; \
1938 } /* firm_set_default_equivalent_node */
1941 * Returns non-zero if a node is a Phi node
1942 * with all predecessors constant.
1944 static int is_const_Phi(ir_node *n) {
1947 if (! is_Phi(n) || get_irn_arity(n) == 0)
1949 for (i = get_irn_arity(n) - 1; i >= 0; --i) {
1950 if (! is_Const(get_irn_n(n, i)))
1954 } /* is_const_Phi */
1956 typedef tarval *(*tarval_sub_type)(tarval *a, tarval *b, ir_mode *mode);
1957 typedef tarval *(*tarval_binop_type)(tarval *a, tarval *b);
1960 * Wrapper for the tarval binop evaluation, tarval_sub has one more parameter.
1962 static tarval *do_eval(tarval *(*eval)(), tarval *a, tarval *b, ir_mode *mode) {
1963 if (eval == tarval_sub) {
1964 tarval_sub_type func = (tarval_sub_type)eval;
1966 return func(a, b, mode);
1968 tarval_binop_type func = (tarval_binop_type)eval;
1975 * Apply an evaluator on a binop with a constant operators (and one Phi).
1977 * @param phi the Phi node
1978 * @param other the other operand
1979 * @param eval an evaluator function
1980 * @param mode the mode of the result, may be different from the mode of the Phi!
1981 * @param left if non-zero, other is the left operand, else the right
1983 * @return a new Phi node if the conversion was successful, NULL else
1985 static ir_node *apply_binop_on_phi(ir_node *phi, tarval *other, tarval *(*eval)(), ir_mode *mode, int left) {
1990 int i, n = get_irn_arity(phi);
1992 NEW_ARR_A(void *, res, n);
1994 for (i = 0; i < n; ++i) {
1995 pred = get_irn_n(phi, i);
1996 tv = get_Const_tarval(pred);
1997 tv = do_eval(eval, other, tv, mode);
1999 if (tv == tarval_bad) {
2000 /* folding failed, bad */
2006 for (i = 0; i < n; ++i) {
2007 pred = get_irn_n(phi, i);
2008 tv = get_Const_tarval(pred);
2009 tv = do_eval(eval, tv, other, mode);
2011 if (tv == tarval_bad) {
2012 /* folding failed, bad */
2018 irg = current_ir_graph;
2019 for (i = 0; i < n; ++i) {
2020 pred = get_irn_n(phi, i);
2021 res[i] = new_r_Const_type(irg, res[i], get_Const_type(pred));
2023 return new_r_Phi(irg, get_nodes_block(phi), n, (ir_node **)res, mode);
2024 } /* apply_binop_on_phi */
2027 * Apply an evaluator on a binop with two constant Phi.
2029 * @param a the left Phi node
2030 * @param b the right Phi node
2031 * @param eval an evaluator function
2032 * @param mode the mode of the result, may be different from the mode of the Phi!
2034 * @return a new Phi node if the conversion was successful, NULL else
2036 static ir_node *apply_binop_on_2_phis(ir_node *a, ir_node *b, tarval *(*eval)(), ir_mode *mode) {
2037 tarval *tv_l, *tv_r, *tv;
2043 if (get_nodes_block(a) != get_nodes_block(b))
2046 n = get_irn_arity(a);
2047 NEW_ARR_A(void *, res, n);
2049 for (i = 0; i < n; ++i) {
2050 pred = get_irn_n(a, i);
2051 tv_l = get_Const_tarval(pred);
2052 pred = get_irn_n(b, i);
2053 tv_r = get_Const_tarval(pred);
2054 tv = do_eval(eval, tv_l, tv_r, mode);
2056 if (tv == tarval_bad) {
2057 /* folding failed, bad */
2062 irg = current_ir_graph;
2063 for (i = 0; i < n; ++i) {
2064 pred = get_irn_n(a, i);
2065 res[i] = new_r_Const_type(irg, res[i], get_Const_type(pred));
2067 return new_r_Phi(irg, get_nodes_block(a), n, (ir_node **)res, mode);
2068 } /* apply_binop_on_2_phis */
2071 * Apply an evaluator on a unop with a constant operator (a Phi).
2073 * @param phi the Phi node
2074 * @param eval an evaluator function
2076 * @return a new Phi node if the conversion was successful, NULL else
2078 static ir_node *apply_unop_on_phi(ir_node *phi, tarval *(*eval)(tarval *)) {
2084 int i, n = get_irn_arity(phi);
2086 NEW_ARR_A(void *, res, n);
2087 for (i = 0; i < n; ++i) {
2088 pred = get_irn_n(phi, i);
2089 tv = get_Const_tarval(pred);
2092 if (tv == tarval_bad) {
2093 /* folding failed, bad */
2098 mode = get_irn_mode(phi);
2099 irg = current_ir_graph;
2100 for (i = 0; i < n; ++i) {
2101 pred = get_irn_n(phi, i);
2102 res[i] = new_r_Const_type(irg, res[i], get_Const_type(pred));
2104 return new_r_Phi(irg, get_nodes_block(phi), n, (ir_node **)res, mode);
2105 } /* apply_unop_on_phi */
2108 * Apply a conversion on a constant operator (a Phi).
2110 * @param phi the Phi node
2112 * @return a new Phi node if the conversion was successful, NULL else
2114 static ir_node *apply_conv_on_phi(ir_node *phi, ir_mode *mode) {
2119 int i, n = get_irn_arity(phi);
2121 NEW_ARR_A(void *, res, n);
2122 for (i = 0; i < n; ++i) {
2123 pred = get_irn_n(phi, i);
2124 tv = get_Const_tarval(pred);
2125 tv = tarval_convert_to(tv, mode);
2127 if (tv == tarval_bad) {
2128 /* folding failed, bad */
2133 irg = current_ir_graph;
2134 for (i = 0; i < n; ++i) {
2135 pred = get_irn_n(phi, i);
2136 res[i] = new_r_Const_type(irg, res[i], get_Const_type(pred));
2138 return new_r_Phi(irg, get_nodes_block(phi), n, (ir_node **)res, mode);
2139 } /* apply_conv_on_phi */
2142 * Transform AddP(P, ConvIs(Iu)), AddP(P, ConvIu(Is)) and
2143 * SubP(P, ConvIs(Iu)), SubP(P, ConvIu(Is)).
2144 * If possible, remove the Conv's.
2146 static ir_node *transform_node_AddSub(ir_node *n) {
2147 ir_mode *mode = get_irn_mode(n);
2149 if (mode_is_reference(mode)) {
2150 ir_node *left = get_binop_left(n);
2151 ir_node *right = get_binop_right(n);
2152 unsigned ref_bits = get_mode_size_bits(mode);
2154 if (is_Conv(left)) {
2155 ir_mode *lmode = get_irn_mode(left);
2156 unsigned bits = get_mode_size_bits(lmode);
2158 if (ref_bits == bits &&
2159 mode_is_int(lmode) &&
2160 get_mode_arithmetic(lmode) == irma_twos_complement) {
2161 ir_node *pre = get_Conv_op(left);
2162 ir_mode *pre_mode = get_irn_mode(pre);
2164 if (mode_is_int(pre_mode) &&
2165 get_mode_size_bits(pre_mode) == bits &&
2166 get_mode_arithmetic(pre_mode) == irma_twos_complement) {
2167 /* ok, this conv just changes to sign, moreover the calculation
2168 * is done with same number of bits as our address mode, so
2169 * we can ignore the conv as address calculation can be viewed
2170 * as either signed or unsigned
2172 set_binop_left(n, pre);
2177 if (is_Conv(right)) {
2178 ir_mode *rmode = get_irn_mode(right);
2179 unsigned bits = get_mode_size_bits(rmode);
2181 if (ref_bits == bits &&
2182 mode_is_int(rmode) &&
2183 get_mode_arithmetic(rmode) == irma_twos_complement) {
2184 ir_node *pre = get_Conv_op(right);
2185 ir_mode *pre_mode = get_irn_mode(pre);
2187 if (mode_is_int(pre_mode) &&
2188 get_mode_size_bits(pre_mode) == bits &&
2189 get_mode_arithmetic(pre_mode) == irma_twos_complement) {
2190 /* ok, this conv just changes to sign, moreover the calculation
2191 * is done with same number of bits as our address mode, so
2192 * we can ignore the conv as address calculation can be viewed
2193 * as either signed or unsigned
2195 set_binop_right(n, pre);
2200 /* let address arithmetic use unsigned modes */
2201 if (is_Const(right)) {
2202 ir_mode *rmode = get_irn_mode(right);
2204 if (mode_is_signed(rmode) && get_mode_arithmetic(rmode) == irma_twos_complement) {
2205 /* convert a AddP(P, *s) into AddP(P, *u) */
2206 ir_mode *nm = get_reference_mode_unsigned_eq(mode);
2208 ir_node *pre = new_r_Conv(current_ir_graph, get_nodes_block(n), right, nm);
2209 set_binop_right(n, pre);
2215 } /* transform_node_AddSub */
2217 #define HANDLE_BINOP_PHI(eval, a, b, c, mode) \
2219 if (is_Const(b) && is_const_Phi(a)) { \
2220 /* check for Op(Phi, Const) */ \
2221 c = apply_binop_on_phi(a, get_Const_tarval(b), eval, mode, 0);\
2223 else if (is_Const(a) && is_const_Phi(b)) { \
2224 /* check for Op(Const, Phi) */ \
2225 c = apply_binop_on_phi(b, get_Const_tarval(a), eval, mode, 1);\
2227 else if (is_const_Phi(a) && is_const_Phi(b)) { \
2228 /* check for Op(Phi, Phi) */ \
2229 c = apply_binop_on_2_phis(a, b, eval, mode); \
2232 DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI); \
2236 #define HANDLE_UNOP_PHI(eval, a, c) \
2238 if (is_const_Phi(a)) { \
2239 /* check for Op(Phi) */ \
2240 c = apply_unop_on_phi(a, eval); \
2242 DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI); \
2248 * Do the AddSub optimization, then Transform
2249 * Constant folding on Phi
2250 * Add(a,a) -> Mul(a, 2)
2251 * Add(Mul(a, x), a) -> Mul(a, x+1)
2252 * if the mode is integer or float.
2253 * Transform Add(a,-b) into Sub(a,b).
2254 * Reassociation might fold this further.
2256 static ir_node *transform_node_Add(ir_node *n) {
2258 ir_node *a, *b, *c, *oldn = n;
2260 n = transform_node_AddSub(n);
2262 a = get_Add_left(n);
2263 b = get_Add_right(n);
2265 mode = get_irn_mode(n);
2267 if (mode_is_reference(mode)) {
2268 ir_mode *lmode = get_irn_mode(a);
2270 if (is_Const(b) && is_Const_null(b) && mode_is_int(lmode)) {
2271 /* an Add(a, NULL) is a hidden Conv */
2272 dbg_info *dbg = get_irn_dbg_info(n);
2273 return new_rd_Conv(dbg, current_ir_graph, get_nodes_block(n), a, mode);
2277 HANDLE_BINOP_PHI(tarval_add, a, b, c, mode);
2279 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
2280 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
2283 if (mode_is_num(mode)) {
2284 /* the following code leads to endless recursion when Mul are replaced by a simple instruction chain */
2285 if (!is_arch_dep_running() && a == b && mode_is_int(mode)) {
2286 ir_node *block = get_nodes_block(n);
2289 get_irn_dbg_info(n),
2293 new_Const_long(mode, 2),
2295 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_A);
2300 get_irn_dbg_info(n),
2306 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
2311 get_irn_dbg_info(n),
2317 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
2320 if (get_mode_arithmetic(mode) == irma_twos_complement) {
2321 /* Here we rely on constants be on the RIGHT side */
2323 ir_node *op = get_Not_op(a);
2325 if (is_Const(b) && is_Const_one(b)) {
2327 ir_node *blk = get_nodes_block(n);
2328 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, op, mode);
2329 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_PLUS_1);
2334 n = new_Const(get_mode_minus_one(mode));
2335 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_X_NOT_X);
2340 ir_node *op = get_Not_op(b);
2344 n = new_Const(get_mode_minus_one(mode));
2345 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_X_NOT_X);
2352 } /* transform_node_Add */
2355 * returns -cnst or NULL if impossible
2357 static ir_node *const_negate(ir_node *cnst) {
2358 tarval *tv = tarval_neg(get_Const_tarval(cnst));
2359 dbg_info *dbgi = get_irn_dbg_info(cnst);
2360 ir_graph *irg = get_irn_irg(cnst);
2361 if (tv == tarval_bad) return NULL;
2362 return new_rd_Const(dbgi, irg, tv);
2366 * Do the AddSub optimization, then Transform
2367 * Constant folding on Phi
2368 * Sub(0,a) -> Minus(a)
2369 * Sub(Mul(a, x), a) -> Mul(a, x-1)
2370 * Sub(Sub(x, y), b) -> Sub(x, Add(y,b))
2371 * Sub(Add(a, x), x) -> a
2372 * Sub(x, Add(x, a)) -> -a
2373 * Sub(x, Const) -> Add(x, -Const)
2375 static ir_node *transform_node_Sub(ir_node *n) {
2380 n = transform_node_AddSub(n);
2382 a = get_Sub_left(n);
2383 b = get_Sub_right(n);
2385 mode = get_irn_mode(n);
2387 if (mode_is_int(mode)) {
2388 ir_mode *lmode = get_irn_mode(a);
2390 if (is_Const(b) && is_Const_null(b) && mode_is_reference(lmode)) {
2391 /* a Sub(a, NULL) is a hidden Conv */
2392 dbg_info *dbg = get_irn_dbg_info(n);
2393 n = new_rd_Conv(dbg, current_ir_graph, get_nodes_block(n), a, mode);
2394 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_CONV);
2398 if (mode == lmode &&
2399 get_mode_arithmetic(mode) == irma_twos_complement &&
2401 get_Const_tarval(a) == get_mode_minus_one(mode)) {
2403 dbg_info *dbg = get_irn_dbg_info(n);
2404 n = new_rd_Not(dbg, current_ir_graph, get_nodes_block(n), b, mode);
2405 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_NOT);
2411 HANDLE_BINOP_PHI(tarval_sub, a, b, c, mode);
2413 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
2414 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
2417 if (is_Const(b) && !mode_is_reference(get_irn_mode(b))) {
2418 /* a - C -> a + (-C) */
2419 ir_node *cnst = const_negate(b);
2421 ir_node *block = get_nodes_block(n);
2422 dbg_info *dbgi = get_irn_dbg_info(n);
2423 ir_graph *irg = get_irn_irg(n);
2425 n = new_rd_Add(dbgi, irg, block, a, cnst, mode);
2426 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2431 if (is_Minus(a)) { /* (-a) - b -> -(a + b) */
2432 ir_graph *irg = current_ir_graph;
2433 dbg_info *dbg = get_irn_dbg_info(n);
2434 ir_node *block = get_nodes_block(n);
2435 ir_node *left = get_Minus_op(a);
2436 ir_node *add = new_rd_Add(dbg, irg, block, left, b, mode);
2438 n = new_rd_Minus(dbg, irg, block, add, mode);
2439 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2441 } else if (is_Minus(b)) { /* a - (-b) -> a + b */
2442 ir_graph *irg = current_ir_graph;
2443 dbg_info *dbg = get_irn_dbg_info(n);
2444 ir_node *block = get_nodes_block(n);
2445 ir_node *right = get_Minus_op(b);
2447 n = new_rd_Add(dbg, irg, block, a, right, mode);
2448 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MINUS);
2450 } else if (is_Sub(b)) {
2451 /* a - (b - c) -> a + (c - b)
2452 * -> (a - b) + c iff (b - c) is a pointer */
2453 ir_graph *irg = current_ir_graph;
2454 dbg_info *s_dbg = get_irn_dbg_info(b);
2455 ir_node *s_block = get_nodes_block(b);
2456 ir_node *s_left = get_Sub_left(b);
2457 ir_node *s_right = get_Sub_right(b);
2458 ir_mode *s_mode = get_irn_mode(b);
2459 if (mode_is_reference(s_mode)) {
2460 ir_node *sub = new_rd_Sub(s_dbg, irg, s_block, a, s_left, mode);
2461 dbg_info *a_dbg = get_irn_dbg_info(n);
2462 ir_node *a_block = get_nodes_block(n);
2465 s_right = new_r_Conv(irg, a_block, s_right, mode);
2466 n = new_rd_Add(a_dbg, irg, a_block, sub, s_right, mode);
2468 ir_node *sub = new_rd_Sub(s_dbg, irg, s_block, s_right, s_left, s_mode);
2469 dbg_info *a_dbg = get_irn_dbg_info(n);
2470 ir_node *a_block = get_nodes_block(n);
2472 n = new_rd_Add(a_dbg, irg, a_block, a, sub, mode);
2474 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2476 } else if (is_Mul(b)) { /* a - (b * C) -> a + (b * -C) */
2477 ir_node *m_right = get_Mul_right(b);
2478 if (is_Const(m_right)) {
2479 ir_node *cnst2 = const_negate(m_right);
2480 if (cnst2 != NULL) {
2481 ir_graph *irg = current_ir_graph;
2482 dbg_info *m_dbg = get_irn_dbg_info(b);
2483 ir_node *m_block = get_nodes_block(b);
2484 ir_node *m_left = get_Mul_left(b);
2485 ir_mode *m_mode = get_irn_mode(b);
2486 ir_node *mul = new_rd_Mul(m_dbg, irg, m_block, m_left, cnst2, m_mode);
2487 dbg_info *a_dbg = get_irn_dbg_info(n);
2488 ir_node *a_block = get_nodes_block(n);
2490 n = new_rd_Add(a_dbg, irg, a_block, a, mul, mode);
2491 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2497 /* Beware of Sub(P, P) which cannot be optimized into a simple Minus ... */
2498 if (mode_is_num(mode) && mode == get_irn_mode(a) && is_Const(a) && is_Const_null(a)) {
2500 get_irn_dbg_info(n),
2505 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_0_A);
2509 if (mode_wrap_around(mode)) {
2510 ir_node *left = get_Add_left(a);
2511 ir_node *right = get_Add_right(a);
2513 /* FIXME: Does the Conv's work only for two complement or generally? */
2515 if (mode != get_irn_mode(right)) {
2516 /* This Sub is an effective Cast */
2517 right = new_r_Conv(get_irn_irg(n), get_nodes_block(n), right, mode);
2520 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2522 } else if (right == b) {
2523 if (mode != get_irn_mode(left)) {
2524 /* This Sub is an effective Cast */
2525 left = new_r_Conv(get_irn_irg(n), get_nodes_block(n), left, mode);
2528 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2534 if (mode_wrap_around(mode)) {
2535 ir_node *left = get_Add_left(b);
2536 ir_node *right = get_Add_right(b);
2538 /* FIXME: Does the Conv's work only for two complement or generally? */
2540 ir_mode *r_mode = get_irn_mode(right);
2542 n = new_r_Minus(get_irn_irg(n), get_nodes_block(n), right, r_mode);
2543 if (mode != r_mode) {
2544 /* This Sub is an effective Cast */
2545 n = new_r_Conv(get_irn_irg(n), get_nodes_block(n), n, mode);
2547 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2549 } else if (right == a) {
2550 ir_mode *l_mode = get_irn_mode(left);
2552 n = new_r_Minus(get_irn_irg(n), get_nodes_block(n), left, l_mode);
2553 if (mode != l_mode) {
2554 /* This Sub is an effective Cast */
2555 n = new_r_Conv(get_irn_irg(n), get_nodes_block(n), n, mode);
2557 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2562 if (mode_is_int(mode) && is_Conv(a) && is_Conv(b)) {
2563 ir_mode *mode = get_irn_mode(a);
2565 if (mode == get_irn_mode(b)) {
2567 ir_node *op_a = get_Conv_op(a);
2568 ir_node *op_b = get_Conv_op(b);
2570 /* check if it's allowed to skip the conv */
2571 ma = get_irn_mode(op_a);
2572 mb = get_irn_mode(op_b);
2574 if (mode_is_reference(ma) && mode_is_reference(mb)) {
2575 /* SubInt(ConvInt(aP), ConvInt(bP)) -> SubInt(aP,bP) */
2578 set_Sub_right(n, b);
2584 /* do NOT execute this code if reassociation is enabled, it does the inverse! */
2585 if (!is_reassoc_running() && is_Mul(a)) {
2586 ir_node *ma = get_Mul_left(a);
2587 ir_node *mb = get_Mul_right(a);
2590 ir_node *blk = get_nodes_block(n);
2592 get_irn_dbg_info(n),
2593 current_ir_graph, blk,
2596 get_irn_dbg_info(n),
2597 current_ir_graph, blk,
2599 new_Const_long(mode, 1),
2602 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
2604 } else if (mb == b) {
2605 ir_node *blk = get_nodes_block(n);
2607 get_irn_dbg_info(n),
2608 current_ir_graph, blk,
2611 get_irn_dbg_info(n),
2612 current_ir_graph, blk,
2614 new_Const_long(mode, 1),
2617 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
2621 if (is_Sub(a)) { /* (x - y) - b -> x - (y + b) */
2622 ir_node *x = get_Sub_left(a);
2623 ir_node *y = get_Sub_right(a);
2624 ir_node *blk = get_nodes_block(n);
2625 ir_mode *m_b = get_irn_mode(b);
2626 ir_mode *m_y = get_irn_mode(y);
2630 /* Determine the right mode for the Add. */
2633 else if (mode_is_reference(m_b))
2635 else if (mode_is_reference(m_y))
2639 * Both modes are different but none is reference,
2640 * happens for instance in SubP(SubP(P, Iu), Is).
2641 * We have two possibilities here: Cast or ignore.
2642 * Currently we ignore this case.
2647 add = new_r_Add(current_ir_graph, blk, y, b, add_mode);
2649 n = new_rd_Sub(get_irn_dbg_info(n), current_ir_graph, blk, x, add, mode);
2650 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_SUB_X_Y_Z);
2654 if (get_mode_arithmetic(mode) == irma_twos_complement) {
2655 if (is_Const(a) && is_Not(b)) {
2656 /* c - ~X = X + (c+1) */
2657 tarval *tv = get_Const_tarval(a);
2659 tv = tarval_add(tv, get_mode_one(mode));
2660 if (tv != tarval_bad) {
2661 ir_node *blk = get_nodes_block(n);
2662 ir_node *c = new_Const(tv);
2663 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, blk, get_Not_op(b), c, mode);
2664 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_C_NOT_X);
2670 } /* transform_node_Sub */
2673 * Several transformation done on n*n=2n bits mul.
2674 * These transformations must be done here because new nodes may be produced.
2676 static ir_node *transform_node_Mul2n(ir_node *n, ir_mode *mode) {
2678 ir_node *a = get_Mul_left(n);
2679 ir_node *b = get_Mul_right(n);
2680 tarval *ta = value_of(a);
2681 tarval *tb = value_of(b);
2682 ir_mode *smode = get_irn_mode(a);
2684 if (ta == get_mode_one(smode)) {
2685 /* (L)1 * (L)b = (L)b */
2686 ir_node *blk = get_nodes_block(n);
2687 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, b, mode);
2688 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
2691 else if (ta == get_mode_minus_one(smode)) {
2692 /* (L)-1 * (L)b = (L)b */
2693 ir_node *blk = get_nodes_block(n);
2694 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, b, smode);
2695 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, n, mode);
2696 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2699 if (tb == get_mode_one(smode)) {
2700 /* (L)a * (L)1 = (L)a */
2701 ir_node *blk = get_irn_n(a, -1);
2702 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, a, mode);
2703 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
2706 else if (tb == get_mode_minus_one(smode)) {
2707 /* (L)a * (L)-1 = (L)-a */
2708 ir_node *blk = get_nodes_block(n);
2709 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, a, smode);
2710 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, n, mode);
2711 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2718 * Transform Mul(a,-1) into -a.
2719 * Do constant evaluation of Phi nodes.
2720 * Do architecture dependent optimizations on Mul nodes
2722 static ir_node *transform_node_Mul(ir_node *n) {
2723 ir_node *c, *oldn = n;
2724 ir_mode *mode = get_irn_mode(n);
2725 ir_node *a = get_Mul_left(n);
2726 ir_node *b = get_Mul_right(n);
2728 if (is_Bad(a) || is_Bad(b))
2731 if (mode != get_irn_mode(a))
2732 return transform_node_Mul2n(n, mode);
2734 HANDLE_BINOP_PHI(tarval_mul, a, b, c, mode);
2736 if (mode_is_signed(mode)) {
2739 if (value_of(a) == get_mode_minus_one(mode))
2741 else if (value_of(b) == get_mode_minus_one(mode))
2744 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), r, mode);
2745 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2750 if (is_Const(b)) { /* (-a) * const -> a * -const */
2751 ir_node *cnst = const_negate(b);
2753 dbg_info *dbgi = get_irn_dbg_info(n);
2754 ir_node *block = get_nodes_block(n);
2755 n = new_rd_Mul(dbgi, current_ir_graph, block, get_Minus_op(a), cnst, mode);
2756 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2759 } else if (is_Minus(b)) { /* (-a) * (-b) -> a * b */
2760 dbg_info *dbgi = get_irn_dbg_info(n);
2761 ir_node *block = get_nodes_block(n);
2762 n = new_rd_Mul(dbgi, current_ir_graph, block, get_Minus_op(a), get_Minus_op(b), mode);
2763 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_MINUS);
2765 } else if (is_Sub(b)) { /* (-a) * (b - c) -> a * (c - b) */
2766 ir_node *sub_l = get_Sub_left(b);
2767 ir_node *sub_r = get_Sub_right(b);
2768 dbg_info *dbgi = get_irn_dbg_info(n);
2769 ir_graph *irg = current_ir_graph;
2770 ir_node *block = get_nodes_block(n);
2771 ir_node *new_b = new_rd_Sub(dbgi, irg, block, sub_r, sub_l, mode);
2772 n = new_rd_Mul(dbgi, irg, block, get_Minus_op(a), new_b, mode);
2773 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS);
2776 } else if (is_Minus(b)) {
2777 if (is_Sub(a)) { /* (a - b) * (-c) -> (b - a) * c */
2778 ir_node *sub_l = get_Sub_left(a);
2779 ir_node *sub_r = get_Sub_right(a);
2780 dbg_info *dbgi = get_irn_dbg_info(n);
2781 ir_graph *irg = current_ir_graph;
2782 ir_node *block = get_nodes_block(n);
2783 ir_node *new_a = new_rd_Sub(dbgi, irg, block, sub_r, sub_l, mode);
2784 n = new_rd_Mul(dbgi, irg, block, new_a, get_Minus_op(b), mode);
2785 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS);
2789 if (get_mode_arithmetic(mode) == irma_ieee754) {
2791 tarval *tv = get_Const_tarval(a);
2792 if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)
2793 && !tarval_is_negative(tv)) {
2794 /* 2.0 * b = b + b */
2795 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), b, b, mode);
2796 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
2800 else if (is_Const(b)) {
2801 tarval *tv = get_Const_tarval(b);
2802 if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)
2803 && !tarval_is_negative(tv)) {
2804 /* a * 2.0 = a + a */
2805 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), a, a, mode);
2806 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
2811 return arch_dep_replace_mul_with_shifts(n);
2812 } /* transform_node_Mul */
2815 * Transform a Div Node.
2817 static ir_node *transform_node_Div(ir_node *n) {
2818 ir_mode *mode = get_Div_resmode(n);
2819 ir_node *a = get_Div_left(n);
2820 ir_node *b = get_Div_right(n);
2824 if (is_Const(b) && is_const_Phi(a)) {
2825 /* check for Div(Phi, Const) */
2826 value = apply_binop_on_phi(a, get_Const_tarval(b), tarval_div, mode, 0);
2828 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2832 else if (is_Const(a) && is_const_Phi(b)) {
2833 /* check for Div(Const, Phi) */
2834 value = apply_binop_on_phi(b, get_Const_tarval(a), tarval_div, mode, 1);
2836 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2840 else if (is_const_Phi(a) && is_const_Phi(b)) {
2841 /* check for Div(Phi, Phi) */
2842 value = apply_binop_on_2_phis(a, b, tarval_div, mode);
2844 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2851 if (tv != tarval_bad) {
2852 value = new_Const(tv);
2854 DBG_OPT_CSTEVAL(n, value);
2857 ir_node *a = get_Div_left(n);
2858 ir_node *b = get_Div_right(n);
2859 const ir_node *dummy;
2861 if (a == b && value_not_zero(a, &dummy)) {
2862 /* BEWARE: we can optimize a/a to 1 only if this cannot cause a exception */
2863 value = new_Const(get_mode_one(mode));
2864 DBG_OPT_CSTEVAL(n, value);
2867 if (mode_is_signed(mode) && is_Const(b)) {
2868 tarval *tv = get_Const_tarval(b);
2870 if (tv == get_mode_minus_one(mode)) {
2872 value = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), a, mode);
2873 DBG_OPT_CSTEVAL(n, value);
2877 /* Try architecture dependent optimization */
2878 value = arch_dep_replace_div_by_const(n);
2886 /* Turn Div into a tuple (mem, jmp, bad, value) */
2887 mem = get_Div_mem(n);
2888 blk = get_nodes_block(n);
2890 /* skip a potential Pin */
2891 mem = skip_Pin(mem);
2892 turn_into_tuple(n, pn_Div_max);
2893 set_Tuple_pred(n, pn_Div_M, mem);
2894 set_Tuple_pred(n, pn_Div_X_regular, new_r_Jmp(current_ir_graph, blk));
2895 set_Tuple_pred(n, pn_Div_X_except, new_Bad());
2896 set_Tuple_pred(n, pn_Div_res, value);
2899 } /* transform_node_Div */
2902 * Transform a Mod node.
2904 static ir_node *transform_node_Mod(ir_node *n) {
2905 ir_mode *mode = get_Mod_resmode(n);
2906 ir_node *a = get_Mod_left(n);
2907 ir_node *b = get_Mod_right(n);
2911 if (is_Const(b) && is_const_Phi(a)) {
2912 /* check for Div(Phi, Const) */
2913 value = apply_binop_on_phi(a, get_Const_tarval(b), tarval_mod, mode, 0);
2915 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2919 else if (is_Const(a) && is_const_Phi(b)) {
2920 /* check for Div(Const, Phi) */
2921 value = apply_binop_on_phi(b, get_Const_tarval(a), tarval_mod, mode, 1);
2923 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2927 else if (is_const_Phi(a) && is_const_Phi(b)) {
2928 /* check for Div(Phi, Phi) */
2929 value = apply_binop_on_2_phis(a, b, tarval_mod, mode);
2931 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2938 if (tv != tarval_bad) {
2939 value = new_Const(tv);
2941 DBG_OPT_CSTEVAL(n, value);
2944 ir_node *a = get_Mod_left(n);
2945 ir_node *b = get_Mod_right(n);
2946 const ir_node *dummy;
2948 if (a == b && value_not_zero(a, &dummy)) {
2949 /* BEWARE: we can optimize a%a to 0 only if this cannot cause a exception */
2950 value = new_Const(get_mode_null(mode));
2951 DBG_OPT_CSTEVAL(n, value);
2954 if (mode_is_signed(mode) && is_Const(b)) {
2955 tarval *tv = get_Const_tarval(b);
2957 if (tv == get_mode_minus_one(mode)) {
2959 value = new_Const(get_mode_null(mode));
2960 DBG_OPT_CSTEVAL(n, value);
2964 /* Try architecture dependent optimization */
2965 value = arch_dep_replace_mod_by_const(n);
2973 /* Turn Mod into a tuple (mem, jmp, bad, value) */
2974 mem = get_Mod_mem(n);
2975 blk = get_nodes_block(n);
2977 /* skip a potential Pin */
2978 mem = skip_Pin(mem);
2979 turn_into_tuple(n, pn_Mod_max);
2980 set_Tuple_pred(n, pn_Mod_M, mem);
2981 set_Tuple_pred(n, pn_Mod_X_regular, new_r_Jmp(current_ir_graph, blk));
2982 set_Tuple_pred(n, pn_Mod_X_except, new_Bad());
2983 set_Tuple_pred(n, pn_Mod_res, value);
2986 } /* transform_node_Mod */
2989 * Transform a DivMod node.
2991 static ir_node *transform_node_DivMod(ir_node *n) {
2992 const ir_node *dummy;
2993 ir_node *a = get_DivMod_left(n);
2994 ir_node *b = get_DivMod_right(n);
2995 ir_mode *mode = get_DivMod_resmode(n);
3000 if (is_Const(b) && is_const_Phi(a)) {
3001 /* check for Div(Phi, Const) */
3002 va = apply_binop_on_phi(a, get_Const_tarval(b), tarval_div, mode, 0);
3003 vb = apply_binop_on_phi(a, get_Const_tarval(b), tarval_mod, mode, 0);
3005 DBG_OPT_ALGSIM0(n, va, FS_OPT_CONST_PHI);
3006 DBG_OPT_ALGSIM0(n, vb, FS_OPT_CONST_PHI);
3010 else if (is_Const(a) && is_const_Phi(b)) {
3011 /* check for Div(Const, Phi) */
3012 va = apply_binop_on_phi(b, get_Const_tarval(a), tarval_div, mode, 1);
3013 vb = apply_binop_on_phi(b, get_Const_tarval(a), tarval_mod, mode, 1);
3015 DBG_OPT_ALGSIM0(n, va, FS_OPT_CONST_PHI);
3016 DBG_OPT_ALGSIM0(n, vb, FS_OPT_CONST_PHI);
3020 else if (is_const_Phi(a) && is_const_Phi(b)) {
3021 /* check for Div(Phi, Phi) */
3022 va = apply_binop_on_2_phis(a, b, tarval_div, mode);
3023 vb = apply_binop_on_2_phis(a, b, tarval_mod, mode);
3025 DBG_OPT_ALGSIM0(n, va, FS_OPT_CONST_PHI);
3026 DBG_OPT_ALGSIM0(n, vb, FS_OPT_CONST_PHI);
3033 if (tb != tarval_bad) {
3034 if (tb == get_mode_one(get_tarval_mode(tb))) {
3036 vb = new_Const(get_mode_null(mode));
3037 DBG_OPT_CSTEVAL(n, vb);
3039 } else if (ta != tarval_bad) {
3040 tarval *resa, *resb;
3041 resa = tarval_div(ta, tb);
3042 if (resa == tarval_bad) return n; /* Causes exception!!! Model by replacing through
3043 Jmp for X result!? */
3044 resb = tarval_mod(ta, tb);
3045 if (resb == tarval_bad) return n; /* Causes exception! */
3046 va = new_Const(resa);
3047 vb = new_Const(resb);
3048 DBG_OPT_CSTEVAL(n, va);
3049 DBG_OPT_CSTEVAL(n, vb);
3051 } else if (mode_is_signed(mode) && tb == get_mode_minus_one(mode)) {
3052 va = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), a, mode);
3053 vb = new_Const(get_mode_null(mode));
3054 DBG_OPT_CSTEVAL(n, va);
3055 DBG_OPT_CSTEVAL(n, vb);
3057 } else { /* Try architecture dependent optimization */
3060 arch_dep_replace_divmod_by_const(&va, &vb, n);
3061 evaluated = va != NULL;
3063 } else if (a == b) {
3064 if (value_not_zero(a, &dummy)) {
3066 va = new_Const(get_mode_one(mode));
3067 vb = new_Const(get_mode_null(mode));
3068 DBG_OPT_CSTEVAL(n, va);
3069 DBG_OPT_CSTEVAL(n, vb);
3072 /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
3075 } else if (ta == get_mode_null(mode) && value_not_zero(b, &dummy)) {
3076 /* 0 / non-Const = 0 */
3081 if (evaluated) { /* replace by tuple */
3085 mem = get_DivMod_mem(n);
3086 /* skip a potential Pin */
3087 mem = skip_Pin(mem);
3089 blk = get_nodes_block(n);
3090 turn_into_tuple(n, pn_DivMod_max);
3091 set_Tuple_pred(n, pn_DivMod_M, mem);
3092 set_Tuple_pred(n, pn_DivMod_X_regular, new_r_Jmp(current_ir_graph, blk));
3093 set_Tuple_pred(n, pn_DivMod_X_except, new_Bad()); /* no exception */
3094 set_Tuple_pred(n, pn_DivMod_res_div, va);
3095 set_Tuple_pred(n, pn_DivMod_res_mod, vb);
3099 } /* transform_node_DivMod */
3102 * Optimize x / c to x * (1/c)
3104 static ir_node *transform_node_Quot(ir_node *n) {
3105 ir_mode *mode = get_Quot_resmode(n);
3108 if (get_mode_arithmetic(mode) == irma_ieee754) {
3109 ir_node *b = get_Quot_right(n);
3110 tarval *tv = value_of(b);
3112 if (tv != tarval_bad) {
3113 int rem = tarval_fp_ops_enabled();
3116 * Floating point constant folding might be disabled here to
3118 * However, as we check for exact result, doing it is safe.
3121 tarval_enable_fp_ops(1);
3122 tv = tarval_quo(get_mode_one(mode), tv);
3123 tarval_enable_fp_ops(rem);
3125 /* Do the transformation if the result is either exact or we are not
3126 using strict rules. */
3127 if (tv != tarval_bad &&
3128 (tarval_ieee754_get_exact() || (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic) == 0)) {
3129 ir_node *blk = get_nodes_block(n);
3130 ir_node *c = new_Const(tv);
3131 ir_node *a = get_Quot_left(n);
3132 ir_node *m = new_rd_Mul(get_irn_dbg_info(n), current_ir_graph, blk, a, c, mode);
3133 ir_node *mem = get_Quot_mem(n);
3135 /* skip a potential Pin */
3136 mem = skip_Pin(mem);
3137 turn_into_tuple(n, pn_Quot_max);
3138 set_Tuple_pred(n, pn_Quot_M, mem);
3139 set_Tuple_pred(n, pn_Quot_X_regular, new_r_Jmp(current_ir_graph, blk));
3140 set_Tuple_pred(n, pn_Quot_X_except, new_r_Bad(current_ir_graph));
3141 set_Tuple_pred(n, pn_Quot_res, m);
3142 DBG_OPT_ALGSIM1(oldn, a, b, m, FS_OPT_FP_INV_MUL);
3147 } /* transform_node_Quot */
3150 * Optimize Abs(x) into x if x is Confirmed >= 0
3151 * Optimize Abs(x) into -x if x is Confirmed <= 0
3152 * Optimize Abs(-x) int Abs(x)
3154 static ir_node *transform_node_Abs(ir_node *n) {
3155 ir_node *c, *oldn = n;
3156 ir_node *a = get_Abs_op(n);
3159 HANDLE_UNOP_PHI(tarval_abs, a, c);
3161 switch (classify_value_sign(a)) {
3162 case value_classified_negative:
3163 mode = get_irn_mode(n);
3166 * We can replace the Abs by -x here.
3167 * We even could add a new Confirm here
3168 * (if not twos complement)
3170 * Note that -x would create a new node, so we could
3171 * not run it in the equivalent_node() context.
3173 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph,
3174 get_nodes_block(n), a, mode);
3176 DBG_OPT_CONFIRM(oldn, n);
3178 case value_classified_positive:
3179 /* n is positive, Abs is not needed */
3182 DBG_OPT_CONFIRM(oldn, n);
3188 /* Abs(-x) = Abs(x) */
3189 mode = get_irn_mode(n);
3190 n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph,
3191 get_nodes_block(n), get_Minus_op(a), mode);
3192 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ABS_MINUS_X);
3196 } /* transform_node_Abs */
3199 * Optimize -a CMP -b into b CMP a.
3200 * This works only for for modes where unary Minus
3202 * Note that two-complement integers can Overflow
3203 * so it will NOT work.
3205 * For == and != can be handled in Proj(Cmp)
3207 static ir_node *transform_node_Cmp(ir_node *n) {
3209 ir_node *left = get_Cmp_left(n);
3210 ir_node *right = get_Cmp_right(n);
3212 if (is_Minus(left) && is_Minus(right) &&
3213 !mode_overflow_on_unary_Minus(get_irn_mode(left))) {
3214 ir_node *const new_left = get_Minus_op(right);
3215 ir_node *const new_right = get_Minus_op(left);
3216 n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph,
3217 get_nodes_block(n), new_left, new_right);
3218 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CMP_OP_OP);
3221 } /* transform_node_Cmp */
3225 * Transform a Cond node.
3227 * Replace the Cond by a Jmp if it branches on a constant
3230 static ir_node *transform_node_Cond(ir_node *n) {
3233 ir_node *a = get_Cond_selector(n);
3234 tarval *ta = value_of(a);
3236 /* we need block info which is not available in floating irgs */
3237 if (get_irg_pinned(current_ir_graph) == op_pin_state_floats)
3240 if ((ta != tarval_bad) &&
3241 (get_irn_mode(a) == mode_b) &&
3242 (get_opt_unreachable_code())) {
3243 /* It's a boolean Cond, branching on a boolean constant.
3244 Replace it by a tuple (Bad, Jmp) or (Jmp, Bad) */
3245 ir_node *blk = get_nodes_block(n);
3246 jmp = new_r_Jmp(current_ir_graph, blk);
3247 turn_into_tuple(n, pn_Cond_max);
3248 if (ta == tarval_b_true) {
3249 set_Tuple_pred(n, pn_Cond_false, new_Bad());
3250 set_Tuple_pred(n, pn_Cond_true, jmp);
3252 set_Tuple_pred(n, pn_Cond_false, jmp);
3253 set_Tuple_pred(n, pn_Cond_true, new_Bad());
3255 /* We might generate an endless loop, so keep it alive. */
3256 add_End_keepalive(get_irg_end(current_ir_graph), blk);
3259 } /* transform_node_Cond */
3262 * Prototype of a recursive transform function
3263 * for bitwise distributive transformations.
3265 typedef ir_node* (*recursive_transform)(ir_node *n);
3268 * makes use of distributive laws for and, or, eor
3269 * and(a OP c, b OP c) -> and(a, b) OP c
3270 * note, might return a different op than n
3272 static ir_node *transform_bitwise_distributive(ir_node *n,
3273 recursive_transform trans_func)
3276 ir_node *a = get_binop_left(n);
3277 ir_node *b = get_binop_right(n);
3278 ir_op *op = get_irn_op(a);
3279 ir_op *op_root = get_irn_op(n);
3281 if(op != get_irn_op(b))
3284 /* and(conv(a), conv(b)) -> conv(and(a,b)) */
3285 if (op == op_Conv) {
3286 ir_node *a_op = get_Conv_op(a);
3287 ir_node *b_op = get_Conv_op(b);
3288 ir_mode *a_mode = get_irn_mode(a_op);
3289 ir_mode *b_mode = get_irn_mode(b_op);
3290 if(a_mode == b_mode && (mode_is_int(a_mode) || a_mode == mode_b)) {
3291 ir_node *blk = get_nodes_block(n);
3294 set_binop_left(n, a_op);
3295 set_binop_right(n, b_op);
3296 set_irn_mode(n, a_mode);
3298 n = new_r_Conv(current_ir_graph, blk, n, get_irn_mode(oldn));
3300 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_SHIFT_AND);
3306 /* nothing to gain here */
3310 if (op == op_Shrs || op == op_Shr || op == op_Shl
3311 || op == op_And || op == op_Or || op == op_Eor) {
3312 ir_node *a_left = get_binop_left(a);
3313 ir_node *a_right = get_binop_right(a);
3314 ir_node *b_left = get_binop_left(b);
3315 ir_node *b_right = get_binop_right(b);
3317 ir_node *op1 = NULL;
3318 ir_node *op2 = NULL;
3320 if (is_op_commutative(op)) {
3321 if (a_left == b_left) {
3325 } else if(a_left == b_right) {
3329 } else if(a_right == b_left) {
3335 if(a_right == b_right) {
3342 /* (a sop c) & (b sop c) => (a & b) sop c */
3343 ir_node *blk = get_nodes_block(n);
3345 ir_node *new_n = exact_copy(n);
3346 set_binop_left(new_n, op1);
3347 set_binop_right(new_n, op2);
3348 new_n = trans_func(new_n);
3350 if(op_root == op_Eor && op == op_Or) {
3351 dbg_info *dbgi = get_irn_dbg_info(n);
3352 ir_graph *irg = current_ir_graph;
3353 ir_mode *mode = get_irn_mode(c);
3355 c = new_rd_Not(dbgi, irg, blk, c, mode);
3356 n = new_rd_And(dbgi, irg, blk, new_n, c, mode);
3359 set_nodes_block(n, blk);
3360 set_binop_left(n, new_n);
3361 set_binop_right(n, c);
3362 add_identities(current_ir_graph->value_table, n);
3365 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_SHIFT_AND);
3376 static ir_node *transform_node_And(ir_node *n) {
3377 ir_node *c, *oldn = n;
3378 ir_node *a = get_And_left(n);
3379 ir_node *b = get_And_right(n);
3382 mode = get_irn_mode(n);
3383 HANDLE_BINOP_PHI(tarval_and, a, b, c, mode);
3385 /* we can evaluate 2 Projs of the same Cmp */
3386 if (mode == mode_b && is_Proj(a) && is_Proj(b)) {
3387 ir_node *pred_a = get_Proj_pred(a);
3388 ir_node *pred_b = get_Proj_pred(b);
3389 if (pred_a == pred_b) {
3390 dbg_info *dbgi = get_irn_dbg_info(n);
3391 ir_node *block = get_nodes_block(pred_a);
3392 pn_Cmp pn_a = get_Proj_proj(a);
3393 pn_Cmp pn_b = get_Proj_proj(b);
3394 /* yes, we can simply calculate with pncs */
3395 pn_Cmp new_pnc = pn_a & pn_b;
3397 return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b, new_pnc);
3402 ir_node *op = get_Not_op(b);
3404 ir_node *ba = get_And_left(op);
3405 ir_node *bb = get_And_right(op);
3407 /* it's enough to test the following cases due to normalization! */
3408 if (get_Or_left(a) == ba && get_Or_right(a) == bb) {
3409 /* (a|b) & ~(a&b) = a^b */
3410 ir_node *block = get_nodes_block(n);
3412 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph, block, ba, bb, mode);
3413 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_TO_EOR);
3421 ir_node *op = get_Not_op(a);
3423 ir_node *aa = get_And_left(op);
3424 ir_node *ab = get_And_right(op);
3426 /* it's enough to test the following cases due to normalization! */
3427 if (get_Or_left(b) == aa && get_Or_right(b) == ab) {
3428 /* (a|b) & ~(a&b) = a^b */
3429 ir_node *block = get_nodes_block(n);
3431 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph, block, aa, ab, mode);
3432 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_TO_EOR);
3439 ir_node *al = get_Eor_left(a);
3440 ir_node *ar = get_Eor_right(a);
3443 /* (b ^ a) & b -> ~a & b */
3444 dbg_info *dbg = get_irn_dbg_info(n);
3445 ir_node *block = get_nodes_block(n);
3447 ar = new_rd_Not(dbg, current_ir_graph, block, ar, mode);
3448 n = new_rd_And(dbg, current_ir_graph, block, ar, b, mode);
3449 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3453 /* (a ^ b) & b -> ~a & b */
3454 dbg_info *dbg = get_irn_dbg_info(n);
3455 ir_node *block = get_nodes_block(n);
3457 al = new_rd_Not(dbg, current_ir_graph, block, al, mode);
3458 n = new_rd_And(dbg, current_ir_graph, block, al, b, mode);
3459 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3464 ir_node *bl = get_Eor_left(b);
3465 ir_node *br = get_Eor_right(b);
3468 /* a & (a ^ b) -> a & ~b */
3469 dbg_info *dbg = get_irn_dbg_info(n);
3470 ir_node *block = get_nodes_block(n);
3472 br = new_rd_Not(dbg, current_ir_graph, block, br, mode);
3473 n = new_rd_And(dbg, current_ir_graph, block, br, a, mode);
3474 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3478 /* a & (b ^ a) -> a & ~b */
3479 dbg_info *dbg = get_irn_dbg_info(n);
3480 ir_node *block = get_nodes_block(n);
3482 bl = new_rd_Not(dbg, current_ir_graph, block, bl, mode);
3483 n = new_rd_And(dbg, current_ir_graph, block, bl, a, mode);
3484 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3488 if (is_Not(a) && is_Not(b)) {
3489 /* ~a & ~b = ~(a|b) */
3490 ir_node *block = get_nodes_block(n);
3491 ir_mode *mode = get_irn_mode(n);
3495 n = new_rd_Or(get_irn_dbg_info(n), current_ir_graph, block, a, b, mode);
3496 n = new_rd_Not(get_irn_dbg_info(n), current_ir_graph, block, n, mode);
3497 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_DEMORGAN);
3501 n = transform_bitwise_distributive(n, transform_node_And);
3504 } /* transform_node_And */
3509 static ir_node *transform_node_Eor(ir_node *n) {
3510 ir_node *c, *oldn = n;
3511 ir_node *a = get_Eor_left(n);
3512 ir_node *b = get_Eor_right(n);
3513 ir_mode *mode = get_irn_mode(n);
3515 HANDLE_BINOP_PHI(tarval_eor, a, b, c, mode);
3517 /* we can evaluate 2 Projs of the same Cmp */
3518 if (mode == mode_b && is_Proj(a) && is_Proj(b)) {
3519 ir_node *pred_a = get_Proj_pred(a);
3520 ir_node *pred_b = get_Proj_pred(b);
3521 if(pred_a == pred_b) {
3522 dbg_info *dbgi = get_irn_dbg_info(n);
3523 ir_node *block = get_nodes_block(pred_a);
3524 pn_Cmp pn_a = get_Proj_proj(a);
3525 pn_Cmp pn_b = get_Proj_proj(b);
3526 /* yes, we can simply calculate with pncs */
3527 pn_Cmp new_pnc = pn_a ^ pn_b;
3529 return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
3536 n = new_rd_Const(get_irn_dbg_info(n), current_ir_graph,
3537 get_mode_null(mode));
3538 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_A_A);
3539 } else if (mode == mode_b &&
3541 is_Const(b) && is_Const_one(b) &&
3542 is_Cmp(get_Proj_pred(a))) {
3543 /* The Eor negates a Cmp. The Cmp has the negated result anyways! */
3544 n = new_r_Proj(current_ir_graph, get_nodes_block(n), get_Proj_pred(a),
3545 mode_b, get_negated_pnc(get_Proj_proj(a), mode));
3547 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT_BOOL);
3548 } else if (is_Const(b)) {
3549 if (is_Not(a)) { /* ~x ^ const -> x ^ ~const */
3550 ir_node *cnst = new_Const(tarval_not(get_Const_tarval(b)));
3551 ir_node *not_op = get_Not_op(a);
3552 dbg_info *dbg = get_irn_dbg_info(n);
3553 ir_graph *irg = current_ir_graph;
3554 ir_node *block = get_nodes_block(n);
3555 ir_mode *mode = get_irn_mode(n);
3556 n = new_rd_Eor(dbg, irg, block, not_op, cnst, mode);
3558 } else if (is_Const_all_one(b)) { /* x ^ 1...1 -> ~1 */
3559 n = new_r_Not(current_ir_graph, get_nodes_block(n), a, mode);
3560 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3563 n = transform_bitwise_distributive(n, transform_node_Eor);
3567 } /* transform_node_Eor */
3572 static ir_node *transform_node_Not(ir_node *n) {
3573 ir_node *c, *oldn = n;
3574 ir_node *a = get_Not_op(n);
3575 ir_mode *mode = get_irn_mode(n);
3577 HANDLE_UNOP_PHI(tarval_not,a,c);
3579 /* check for a boolean Not */
3580 if (mode == mode_b &&
3582 is_Cmp(get_Proj_pred(a))) {
3583 /* We negate a Cmp. The Cmp has the negated result anyways! */
3584 n = new_r_Proj(current_ir_graph, get_nodes_block(n), get_Proj_pred(a),
3585 mode_b, get_negated_pnc(get_Proj_proj(a), mode_b));
3586 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_CMP);
3590 ir_node *eor_b = get_Eor_right(a);
3591 if (is_Const(eor_b)) { /* ~(x ^ const) -> x ^ ~const */
3592 ir_node *cnst = new_Const(tarval_not(get_Const_tarval(eor_b)));
3593 ir_node *eor_a = get_Eor_left(a);
3594 dbg_info *dbg = get_irn_dbg_info(n);
3595 ir_graph *irg = current_ir_graph;
3596 ir_node *block = get_nodes_block(n);
3597 ir_mode *mode = get_irn_mode(n);
3598 n = new_rd_Eor(dbg, irg, block, eor_a, cnst, mode);
3602 if (get_mode_arithmetic(mode) == irma_twos_complement) {
3603 if (is_Minus(a)) { /* ~-x -> x + -1 */
3604 dbg_info *dbg = get_irn_dbg_info(n);
3605 ir_graph *irg = current_ir_graph;
3606 ir_node *block = get_nodes_block(n);
3607 ir_node *add_l = get_Minus_op(a);
3608 ir_node *add_r = new_rd_Const(dbg, irg, get_mode_minus_one(mode));
3609 n = new_rd_Add(dbg, irg, block, add_l, add_r, mode);
3610 } else if (is_Add(a)) {
3611 ir_node *add_r = get_Add_right(a);
3612 if (is_Const(add_r) && is_Const_all_one(add_r)) {
3613 /* ~(x + -1) = -x */
3614 ir_node *op = get_Add_left(a);
3615 ir_node *blk = get_nodes_block(n);
3616 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, op, get_irn_mode(n));
3617 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_MINUS_1);
3622 } /* transform_node_Not */
3625 * Transform a Minus.
3629 * -(a >>u (size-1)) = a >>s (size-1)
3630 * -(a >>s (size-1)) = a >>u (size-1)
3631 * -(a * const) -> a * -const
3633 static ir_node *transform_node_Minus(ir_node *n) {
3634 ir_node *c, *oldn = n;
3635 ir_node *a = get_Minus_op(n);
3638 HANDLE_UNOP_PHI(tarval_neg,a,c);
3640 mode = get_irn_mode(a);
3641 if (get_mode_arithmetic(mode) == irma_twos_complement) {
3642 /* the following rules are only to twos-complement */
3645 ir_node *op = get_Not_op(a);
3646 tarval *tv = get_mode_one(mode);
3647 ir_node *blk = get_nodes_block(n);
3648 ir_node *c = new_Const(tv);
3649 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, blk, op, c, mode);
3650 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_NOT);
3654 ir_node *c = get_Shr_right(a);
3657 tarval *tv = get_Const_tarval(c);
3659 if (tarval_is_long(tv) && get_tarval_long(tv) == (int) get_mode_size_bits(mode) - 1) {
3660 /* -(a >>u (size-1)) = a >>s (size-1) */
3661 ir_node *v = get_Shr_left(a);
3663 n = new_rd_Shrs(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), v, c, mode);
3664 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_PREDICATE);
3670 ir_node *c = get_Shrs_right(a);
3673 tarval *tv = get_Const_tarval(c);
3675 if (tarval_is_long(tv) && get_tarval_long(tv) == (int) get_mode_size_bits(mode) - 1) {
3676 /* -(a >>s (size-1)) = a >>u (size-1) */
3677 ir_node *v = get_Shrs_left(a);
3679 n = new_rd_Shr(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), v, c, mode);
3680 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_PREDICATE);
3687 /* - (a-b) = b - a */
3688 ir_node *la = get_Sub_left(a);
3689 ir_node *ra = get_Sub_right(a);
3690 ir_node *blk = get_nodes_block(n);
3692 n = new_rd_Sub(get_irn_dbg_info(n), current_ir_graph, blk, ra, la, mode);
3693 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_SUB);
3697 if (is_Mul(a)) { /* -(a * const) -> a * -const */
3698 ir_node *mul_l = get_Mul_left(a);
3699 ir_node *mul_r = get_Mul_right(a);
3700 tarval *tv = value_of(mul_r);
3701 if (tv != tarval_bad) {
3702 tv = tarval_neg(tv);
3703 if (tv != tarval_bad) {
3704 ir_node *cnst = new_Const(tv);
3705 dbg_info *dbg = get_irn_dbg_info(a);
3706 ir_graph *irg = current_ir_graph;
3707 ir_node *block = get_nodes_block(a);
3708 n = new_rd_Mul(dbg, irg, block, mul_l, cnst, mode);
3709 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_MUL_C);
3716 } /* transform_node_Minus */
3719 * Transform a Cast_type(Const) into a new Const_type
3721 static ir_node *transform_node_Cast(ir_node *n) {
3723 ir_node *pred = get_Cast_op(n);
3724 ir_type *tp = get_irn_type(n);
3726 if (is_Const(pred) && get_Const_type(pred) != tp) {
3727 n = new_rd_Const_type(NULL, current_ir_graph, get_Const_tarval(pred), tp);
3728 DBG_OPT_CSTEVAL(oldn, n);
3729 } else if (is_SymConst(pred) && get_SymConst_value_type(pred) != tp) {
3730 n = new_rd_SymConst_type(NULL, current_ir_graph, get_irn_n(pred, -1), get_irn_mode(pred),
3731 get_SymConst_symbol(pred), get_SymConst_kind(pred), tp);
3732 DBG_OPT_CSTEVAL(oldn, n);
3736 } /* transform_node_Cast */
3739 * Transform a Proj(Load) with a non-null address.
3741 static ir_node *transform_node_Proj_Load(ir_node *proj) {
3742 if (get_opt_ldst_only_null_ptr_exceptions()) {
3743 if (get_irn_mode(proj) == mode_X) {
3744 ir_node *load = get_Proj_pred(proj);
3746 /* get the Load address */
3747 const ir_node *addr = get_Load_ptr(load);
3748 const ir_node *confirm;
3750 if (value_not_null(addr, &confirm)) {
3751 if (confirm == NULL) {
3752 /* this node may float if it did not depend on a Confirm */
3753 set_irn_pinned(load, op_pin_state_floats);
3755 if (get_Proj_proj(proj) == pn_Load_X_except) {
3756 DBG_OPT_EXC_REM(proj);
3757 return get_irg_bad(current_ir_graph);
3759 ir_node *blk = get_nodes_block(load);
3760 return new_r_Jmp(current_ir_graph, blk);
3766 } /* transform_node_Proj_Load */
3769 * Transform a Proj(Store) with a non-null address.
3771 static ir_node *transform_node_Proj_Store(ir_node *proj) {
3772 if (get_opt_ldst_only_null_ptr_exceptions()) {
3773 if (get_irn_mode(proj) == mode_X) {
3774 ir_node *store = get_Proj_pred(proj);
3776 /* get the load/store address */
3777 const ir_node *addr = get_Store_ptr(store);
3778 const ir_node *confirm;
3780 if (value_not_null(addr, &confirm)) {
3781 if (confirm == NULL) {
3782 /* this node may float if it did not depend on a Confirm */
3783 set_irn_pinned(store, op_pin_state_floats);
3785 if (get_Proj_proj(proj) == pn_Store_X_except) {
3786 DBG_OPT_EXC_REM(proj);
3787 return get_irg_bad(current_ir_graph);
3789 ir_node *blk = get_nodes_block(store);
3790 return new_r_Jmp(current_ir_graph, blk);
3796 } /* transform_node_Proj_Store */
3799 * Transform a Proj(Div) with a non-zero value.
3800 * Removes the exceptions and routes the memory to the NoMem node.
3802 static ir_node *transform_node_Proj_Div(ir_node *proj) {
3803 ir_node *div = get_Proj_pred(proj);
3804 ir_node *b = get_Div_right(div);
3805 ir_node *res, *new_mem;
3806 const ir_node *confirm;
3809 if (value_not_zero(b, &confirm)) {
3810 /* div(x, y) && y != 0 */
3811 if (confirm == NULL) {
3812 /* we are sure we have a Const != 0 */
3813 new_mem = get_Div_mem(div);
3814 new_mem = skip_Pin(new_mem);
3815 set_Div_mem(div, new_mem);
3816 set_irn_pinned(div, op_pin_state_floats);
3819 proj_nr = get_Proj_proj(proj);
3821 case pn_Div_X_regular:
3822 return new_r_Jmp(current_ir_graph, get_irn_n(div, -1));
3824 case pn_Div_X_except:
3825 /* we found an exception handler, remove it */
3826 DBG_OPT_EXC_REM(proj);
3830 res = get_Div_mem(div);
3831 new_mem = get_irg_no_mem(current_ir_graph);
3834 /* This node can only float up to the Confirm block */
3835 new_mem = new_r_Pin(current_ir_graph, get_nodes_block(confirm), new_mem);
3837 set_irn_pinned(div, op_pin_state_floats);
3838 /* this is a Div without exception, we can remove the memory edge */
3839 set_Div_mem(div, new_mem);
3844 } /* transform_node_Proj_Div */
3847 * Transform a Proj(Mod) with a non-zero value.
3848 * Removes the exceptions and routes the memory to the NoMem node.
3850 static ir_node *transform_node_Proj_Mod(ir_node *proj) {
3851 ir_node *mod = get_Proj_pred(proj);
3852 ir_node *b = get_Mod_right(mod);
3853 ir_node *res, *new_mem;
3854 const ir_node *confirm;
3857 if (value_not_zero(b, &confirm)) {
3858 /* mod(x, y) && y != 0 */
3859 proj_nr = get_Proj_proj(proj);
3861 if (confirm == NULL) {
3862 /* we are sure we have a Const != 0 */
3863 new_mem = get_Mod_mem(mod);
3864 new_mem = skip_Pin(new_mem);
3865 set_Mod_mem(mod, new_mem);
3866 set_irn_pinned(mod, op_pin_state_floats);
3871 case pn_Mod_X_regular:
3872 return new_r_Jmp(current_ir_graph, get_irn_n(mod, -1));
3874 case pn_Mod_X_except:
3875 /* we found an exception handler, remove it */
3876 DBG_OPT_EXC_REM(proj);
3880 res = get_Mod_mem(mod);
3881 new_mem = get_irg_no_mem(current_ir_graph);
3884 /* This node can only float up to the Confirm block */
3885 new_mem = new_r_Pin(current_ir_graph, get_nodes_block(confirm), new_mem);
3887 /* this is a Mod without exception, we can remove the memory edge */
3888 set_Mod_mem(mod, new_mem);
3891 if (get_Mod_left(mod) == b) {
3892 /* a % a = 0 if a != 0 */
3893 ir_mode *mode = get_irn_mode(proj);
3894 ir_node *res = new_Const(get_mode_null(mode));
3896 DBG_OPT_CSTEVAL(mod, res);
3902 } /* transform_node_Proj_Mod */
3905 * Transform a Proj(DivMod) with a non-zero value.
3906 * Removes the exceptions and routes the memory to the NoMem node.
3908 static ir_node *transform_node_Proj_DivMod(ir_node *proj) {
3909 ir_node *divmod = get_Proj_pred(proj);
3910 ir_node *b = get_DivMod_right(divmod);
3911 ir_node *res, *new_mem;
3912 const ir_node *confirm;
3915 if (value_not_zero(b, &confirm)) {
3916 /* DivMod(x, y) && y != 0 */
3917 proj_nr = get_Proj_proj(proj);
3919 if (confirm == NULL) {
3920 /* we are sure we have a Const != 0 */
3921 new_mem = get_DivMod_mem(divmod);
3922 new_mem = skip_Pin(new_mem);
3923 set_DivMod_mem(divmod, new_mem);
3924 set_irn_pinned(divmod, op_pin_state_floats);
3929 case pn_DivMod_X_regular:
3930 return new_r_Jmp(current_ir_graph, get_irn_n(divmod, -1));
3932 case pn_DivMod_X_except:
3933 /* we found an exception handler, remove it */
3934 DBG_OPT_EXC_REM(proj);
3938 res = get_DivMod_mem(divmod);
3939 new_mem = get_irg_no_mem(current_ir_graph);
3942 /* This node can only float up to the Confirm block */
3943 new_mem = new_r_Pin(current_ir_graph, get_nodes_block(confirm), new_mem);
3945 /* this is a DivMod without exception, we can remove the memory edge */
3946 set_DivMod_mem(divmod, new_mem);
3949 case pn_DivMod_res_mod:
3950 if (get_DivMod_left(divmod) == b) {
3951 /* a % a = 0 if a != 0 */
3952 ir_mode *mode = get_irn_mode(proj);
3953 ir_node *res = new_Const(get_mode_null(mode));
3955 DBG_OPT_CSTEVAL(divmod, res);
3961 } /* transform_node_Proj_DivMod */
3964 * Optimizes jump tables (CondIs or CondIu) by removing all impossible cases.
3966 static ir_node *transform_node_Proj_Cond(ir_node *proj) {
3967 if (get_opt_unreachable_code()) {
3968 ir_node *n = get_Proj_pred(proj);
3969 ir_node *b = get_Cond_selector(n);
3971 if (mode_is_int(get_irn_mode(b))) {
3972 tarval *tb = value_of(b);
3974 if (tb != tarval_bad) {
3975 /* we have a constant switch */
3976 long num = get_Proj_proj(proj);
3978 if (num != get_Cond_default_proj(n)) { /* we cannot optimize default Proj's yet */
3979 if (get_tarval_long(tb) == num) {
3980 /* Do NOT create a jump here, or we will have 2 control flow ops
3981 * in a block. This case is optimized away in optimize_cf(). */
3984 /* this case will NEVER be taken, kill it */
3985 return get_irg_bad(current_ir_graph);
3992 } /* transform_node_Proj_Cond */
3995 * Create a 0 constant of given mode.
3997 static ir_node *create_zero_const(ir_mode *mode) {
3998 tarval *tv = get_mode_null(mode);
3999 ir_node *cnst = new_Const(tv);
4004 /* the order of the values is important! */
4005 typedef enum const_class {
4011 static const_class classify_const(const ir_node* n)
4013 if (is_Const(n)) return const_const;
4014 if (is_irn_constlike(n)) return const_like;
4019 * Determines whether r is more constlike or has a larger index (in that order)
4022 static int operands_are_normalized(const ir_node *l, const ir_node *r)
4024 const const_class l_order = classify_const(l);
4025 const const_class r_order = classify_const(r);
4027 l_order > r_order ||
4028 (l_order == r_order && get_irn_idx(l) <= get_irn_idx(r));
4032 * Normalizes and optimizes Cmp nodes.
4034 static ir_node *transform_node_Proj_Cmp(ir_node *proj) {
4035 ir_node *n = get_Proj_pred(proj);
4036 ir_node *left = get_Cmp_left(n);
4037 ir_node *right = get_Cmp_right(n);
4040 ir_mode *mode = NULL;
4041 long proj_nr = get_Proj_proj(proj);
4043 /* we can evaluate some cases directly */
4046 return new_Const(get_tarval_b_false());
4048 return new_Const(get_tarval_b_true());
4050 if (!mode_is_float(get_irn_mode(left)))
4051 return new_Const(get_tarval_b_true());
4057 /* remove Casts of both sides */
4058 left = skip_Cast(left);
4059 right = skip_Cast(right);
4061 /* Remove unnecessary conversions */
4062 /* TODO handle constants */
4063 if (is_Conv(left) && is_Conv(right)) {
4064 ir_mode *mode = get_irn_mode(left);
4065 ir_node *op_left = get_Conv_op(left);
4066 ir_node *op_right = get_Conv_op(right);
4067 ir_mode *mode_left = get_irn_mode(op_left);
4068 ir_mode *mode_right = get_irn_mode(op_right);
4070 if (smaller_mode(mode_left, mode) && smaller_mode(mode_right, mode)
4071 && mode_left != mode_b && mode_right != mode_b) {
4072 ir_graph *irg = current_ir_graph;
4073 ir_node *block = get_nodes_block(n);
4075 if (mode_left == mode_right) {
4079 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV_CONV);
4080 } else if (smaller_mode(mode_left, mode_right)) {
4081 left = new_r_Conv(irg, block, op_left, mode_right);
4084 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV);
4085 } else if (smaller_mode(mode_right, mode_left)) {
4087 right = new_r_Conv(irg, block, op_right, mode_left);
4089 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV);
4094 /* remove operation on both sides if possible */
4095 if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
4097 * The following operations are NOT safe for floating point operations, for instance
4098 * 1.0 + inf == 2.0 + inf, =/=> x == y
4100 if (mode_is_int(get_irn_mode(left))) {
4101 unsigned lop = get_irn_opcode(left);
4103 if (lop == get_irn_opcode(right)) {
4104 ir_node *ll, *lr, *rl, *rr;
4106 /* same operation on both sides, try to remove */
4110 /* ~a CMP ~b => a CMP b, -a CMP -b ==> a CMP b */
4111 left = get_unop_op(left);
4112 right = get_unop_op(right);
4114 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4117 ll = get_Add_left(left);
4118 lr = get_Add_right(left);
4119 rl = get_Add_left(right);
4120 rr = get_Add_right(right);
4123 /* X + a CMP X + b ==> a CMP b */
4127 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4128 } else if (ll == rr) {
4129 /* X + a CMP b + X ==> a CMP b */
4133 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4134 } else if (lr == rl) {
4135 /* a + X CMP X + b ==> a CMP b */
4139 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4140 } else if (lr == rr) {
4141 /* a + X CMP b + X ==> a CMP b */
4145 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4149 ll = get_Sub_left(left);
4150 lr = get_Sub_right(left);
4151 rl = get_Sub_left(right);
4152 rr = get_Sub_right(right);
4155 /* X - a CMP X - b ==> a CMP b */
4159 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4160 } else if (lr == rr) {
4161 /* a - X CMP b - X ==> a CMP b */
4165 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4169 if (get_Rotl_right(left) == get_Rotl_right(right)) {
4170 /* a ROTL X CMP b ROTL X ==> a CMP b */
4171 left = get_Rotl_left(left);
4172 right = get_Rotl_left(right);
4174 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4182 /* X+A == A, A+X == A, A-X == A -> X == 0 */
4183 if (is_Add(left) || is_Sub(left)) {
4184 ir_node *ll = get_binop_left(left);
4185 ir_node *lr = get_binop_right(left);
4187 if (lr == right && is_Add(left)) {
4194 right = create_zero_const(get_irn_mode(left));
4196 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4199 if (is_Add(right) || is_Sub(right)) {
4200 ir_node *rl = get_binop_left(right);
4201 ir_node *rr = get_binop_right(right);
4203 if (rr == left && is_Add(right)) {
4210 right = create_zero_const(get_irn_mode(left));
4212 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4215 if (is_And(left) && is_Const(right)) {
4216 ir_node *ll = get_binop_left(left);
4217 ir_node *lr = get_binop_right(left);
4218 if (is_Shr(ll) && is_Const(lr)) {
4219 /* Cmp((x >>u c1) & c2, c3) = Cmp(x & (c2 << c1), c3 << c1) */
4220 ir_node *block = get_nodes_block(n);
4221 ir_mode *mode = get_irn_mode(left);
4223 ir_node *llr = get_Shr_right(ll);
4224 if (is_Const(llr)) {
4225 ir_graph *irg = current_ir_graph;
4226 dbg_info *dbg = get_irn_dbg_info(left);
4228 tarval *c1 = get_Const_tarval(llr);
4229 tarval *c2 = get_Const_tarval(lr);
4230 tarval *c3 = get_Const_tarval(right);
4231 tarval *mask = tarval_shl(c2, c1);
4232 tarval *value = tarval_shl(c3, c1);
4234 left = new_rd_And(dbg, irg, block, get_Shr_left(ll), new_Const(mask), mode);
4235 right = new_Const(value);
4240 } /* mode_is_int(...) */
4241 } /* proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg */
4243 /* replace mode_b compares with ands/ors */
4244 if (get_irn_mode(left) == mode_b) {
4245 ir_graph *irg = current_ir_graph;
4246 ir_node *block = get_nodes_block(n);
4250 case pn_Cmp_Le: bres = new_r_Or( irg, block, new_r_Not(irg, block, left, mode_b), right, mode_b); break;
4251 case pn_Cmp_Lt: bres = new_r_And(irg, block, new_r_Not(irg, block, left, mode_b), right, mode_b); break;
4252 case pn_Cmp_Ge: bres = new_r_Or( irg, block, left, new_r_Not(irg, block, right, mode_b), mode_b); break;
4253 case pn_Cmp_Gt: bres = new_r_And(irg, block, left, new_r_Not(irg, block, right, mode_b), mode_b); break;
4254 case pn_Cmp_Lg: bres = new_r_Eor(irg, block, left, right, mode_b); break;
4255 case pn_Cmp_Eq: bres = new_r_Not(irg, block, new_r_Eor(irg, block, left, right, mode_b), mode_b); break;
4256 default: bres = NULL;
4259 DBG_OPT_ALGSIM0(n, bres, FS_OPT_CMP_TO_BOOL);
4265 * First step: normalize the compare op
4266 * by placing the constant on the right side
4267 * or moving the lower address node to the left.
4269 if (!operands_are_normalized(left, right)) {
4275 proj_nr = get_inversed_pnc(proj_nr);
4280 * Second step: Try to reduce the magnitude
4281 * of a constant. This may help to generate better code
4282 * later and may help to normalize more compares.
4283 * Of course this is only possible for integer values.
4285 tv = value_of(right);
4286 if (tv != tarval_bad) {
4287 mode = get_irn_mode(right);
4289 /* TODO extend to arbitrary constants */
4290 if (is_Conv(left) && tarval_is_null(tv)) {
4291 ir_node *op = get_Conv_op(left);
4292 ir_mode *op_mode = get_irn_mode(op);
4295 * UpConv(x) REL 0 ==> x REL 0
4297 if (get_mode_size_bits(mode) > get_mode_size_bits(op_mode) &&
4298 ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) ||
4299 mode_is_signed(mode) || !mode_is_signed(op_mode))) {
4300 tv = get_mode_null(op_mode);
4304 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV);
4308 if (tv != tarval_bad) {
4309 /* the following optimization is possible on modes without Overflow
4310 * on Unary Minus or on == and !=:
4311 * -a CMP c ==> a swap(CMP) -c
4313 * Beware: for two-complement Overflow may occur, so only == and != can
4314 * be optimized, see this:
4315 * -MININT < 0 =/=> MININT > 0 !!!
4317 if (is_Minus(left) &&
4318 (!mode_overflow_on_unary_Minus(mode) ||
4319 (mode_is_int(mode) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)))) {
4320 tv = tarval_neg(tv);
4322 if (tv != tarval_bad) {
4323 left = get_Minus_op(left);
4324 proj_nr = get_inversed_pnc(proj_nr);
4326 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4328 } else if (is_Not(left) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)) {
4329 /* Not(a) ==/!= c ==> a ==/!= Not(c) */
4330 tv = tarval_not(tv);
4332 if (tv != tarval_bad) {
4333 left = get_Not_op(left);
4335 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4339 /* for integer modes, we have more */
4340 if (mode_is_int(mode)) {
4341 /* Ne includes Unordered which is not possible on integers.
4342 * However, frontends often use this wrong, so fix it here */
4343 if (proj_nr & pn_Cmp_Uo) {
4344 proj_nr &= ~pn_Cmp_Uo;
4345 set_Proj_proj(proj, proj_nr);
4348 /* c > 0 : a < c ==> a <= (c-1) a >= c ==> a > (c-1) */
4349 if ((proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Ge) &&
4350 tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Gt) {
4351 tv = tarval_sub(tv, get_mode_one(mode), NULL);
4353 if (tv != tarval_bad) {
4354 proj_nr ^= pn_Cmp_Eq;
4356 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CNST_MAGN);
4359 /* c < 0 : a > c ==> a >= (c+1) a <= c ==> a < (c+1) */
4360 else if ((proj_nr == pn_Cmp_Gt || proj_nr == pn_Cmp_Le) &&
4361 tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Lt) {
4362 tv = tarval_add(tv, get_mode_one(mode));
4364 if (tv != tarval_bad) {
4365 proj_nr ^= pn_Cmp_Eq;
4367 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CNST_MAGN);
4371 /* the following reassociations work only for == and != */
4372 if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
4374 #if 0 /* Might be not that good in general */
4375 /* a-b == 0 ==> a == b, a-b != 0 ==> a != b */
4376 if (tarval_is_null(tv) && is_Sub(left)) {
4377 right = get_Sub_right(left);
4378 left = get_Sub_left(left);
4380 tv = value_of(right);
4382 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4386 if (tv != tarval_bad) {
4387 /* a-c1 == c2 ==> a == c2+c1, a-c1 != c2 ==> a != c2+c1 */
4389 ir_node *c1 = get_Sub_right(left);
4390 tarval *tv2 = value_of(c1);
4392 if (tv2 != tarval_bad) {
4393 tv2 = tarval_add(tv, value_of(c1));
4395 if (tv2 != tarval_bad) {
4396 left = get_Sub_left(left);
4399 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4403 /* a+c1 == c2 ==> a == c2-c1, a+c1 != c2 ==> a != c2-c1 */
4404 else if (is_Add(left)) {
4405 ir_node *a_l = get_Add_left(left);
4406 ir_node *a_r = get_Add_right(left);
4410 if (is_Const(a_l)) {
4412 tv2 = value_of(a_l);
4415 tv2 = value_of(a_r);
4418 if (tv2 != tarval_bad) {
4419 tv2 = tarval_sub(tv, tv2, NULL);
4421 if (tv2 != tarval_bad) {
4425 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4429 /* -a == c ==> a == -c, -a != c ==> a != -c */
4430 else if (is_Minus(left)) {
4431 tarval *tv2 = tarval_sub(get_mode_null(mode), tv, NULL);
4433 if (tv2 != tarval_bad) {
4434 left = get_Minus_op(left);
4437 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4442 /* the following reassociations work only for <= */
4443 else if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
4444 if (tv != tarval_bad) {
4445 /* c >= 0 : Abs(a) <= c ==> (unsigned)(a + c) <= 2*c */
4446 if (is_Abs(left)) { // TODO something is missing here
4452 if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
4453 switch (get_irn_opcode(left)) {
4457 c1 = get_And_right(left);
4460 * And(x, C1) == C2 ==> FALSE if C2 & C1 != C2
4461 * And(x, C1) != C2 ==> TRUE if C2 & C1 != C2
4463 tarval *mask = tarval_and(get_Const_tarval(c1), tv);
4465 /* TODO: move to constant evaluation */
4466 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4468 DBG_OPT_CSTEVAL(proj, c1);
4472 if (tarval_is_single_bit(tv)) {
4474 * optimization for AND:
4476 * And(x, C) == C ==> And(x, C) != 0
4477 * And(x, C) != C ==> And(X, C) == 0
4479 * if C is a single Bit constant.
4482 /* check for Constant's match. We have check hare the tarvals,
4483 because our const might be changed */
4484 if (get_Const_tarval(c1) == tv) {
4485 /* fine: do the transformation */
4486 tv = get_mode_null(get_tarval_mode(tv));
4487 proj_nr ^= pn_Cmp_Leg;
4489 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CNST_MAGN);
4495 c1 = get_Or_right(left);
4496 if (is_Const(c1) && tarval_is_null(tv)) {
4498 * Or(x, C) == 0 && C != 0 ==> FALSE
4499 * Or(x, C) != 0 && C != 0 ==> TRUE
4501 if (! tarval_is_null(get_Const_tarval(c1))) {
4502 /* TODO: move to constant evaluation */
4503 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4505 DBG_OPT_CSTEVAL(proj, c1);
4512 * optimize x << c1 == c into x & (-1 >>u c1) == c >> c1 if c & (-1 << c1) == c
4514 * optimize x << c1 != c into x & (-1 >>u c1) != c >> c1 if c & (-1 << c1) == c
4517 c1 = get_Shl_right(left);
4519 tarval *tv1 = get_Const_tarval(c1);
4520 ir_mode *mode = get_irn_mode(left);
4521 tarval *minus1 = get_mode_all_one(mode);
4522 tarval *amask = tarval_shr(minus1, tv1);
4523 tarval *cmask = tarval_shl(minus1, tv1);
4526 if (tarval_and(tv, cmask) != tv) {
4527 /* condition not met */
4528 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4530 DBG_OPT_CSTEVAL(proj, c1);
4533 sl = get_Shl_left(left);
4534 blk = get_nodes_block(n);
4535 left = new_rd_And(get_irn_dbg_info(left), current_ir_graph, blk, sl, new_Const(amask), mode);
4536 tv = tarval_shr(tv, tv1);
4538 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_SHF_TO_AND);
4543 * optimize x >>u c1 == c into x & (-1 << c1) == c << c1 if c & (-1 >>u c1) == c
4545 * optimize x >>u c1 != c into x & (-1 << c1) != c << c1 if c & (-1 >>u c1) == c
4548 c1 = get_Shr_right(left);
4550 tarval *tv1 = get_Const_tarval(c1);
4551 ir_mode *mode = get_irn_mode(left);
4552 tarval *minus1 = get_mode_all_one(mode);
4553 tarval *amask = tarval_shl(minus1, tv1);
4554 tarval *cmask = tarval_shr(minus1, tv1);
4557 if (tarval_and(tv, cmask) != tv) {
4558 /* condition not met */
4559 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4561 DBG_OPT_CSTEVAL(proj, c1);
4564 sl = get_Shr_left(left);
4565 blk = get_nodes_block(n);
4566 left = new_rd_And(get_irn_dbg_info(left), current_ir_graph, blk, sl, new_Const(amask), mode);
4567 tv = tarval_shl(tv, tv1);
4569 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_SHF_TO_AND);
4574 * optimize x >>s c1 == c into x & (-1 << c1) == c << c1 if (c >>s (BITS - c1)) \in {0,-1}
4576 * optimize x >>s c1 != c into x & (-1 << c1) != c << c1 if (c >>s (BITS - c1)) \in {0,-1}
4579 c1 = get_Shrs_right(left);
4581 tarval *tv1 = get_Const_tarval(c1);
4582 ir_mode *mode = get_irn_mode(left);
4583 tarval *minus1 = get_mode_all_one(mode);
4584 tarval *amask = tarval_shl(minus1, tv1);
4585 tarval *cond = new_tarval_from_long(get_mode_size_bits(mode), get_tarval_mode(tv1));
4588 cond = tarval_sub(cond, tv1, NULL);
4589 cond = tarval_shrs(tv, cond);
4591 if (!tarval_is_all_one(cond) && !tarval_is_null(cond)) {
4592 /* condition not met */
4593 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4595 DBG_OPT_CSTEVAL(proj, c1);
4598 sl = get_Shrs_left(left);
4599 blk = get_nodes_block(n);
4600 left = new_rd_And(get_irn_dbg_info(left), current_ir_graph, blk, sl, new_Const(amask), mode);
4601 tv = tarval_shl(tv, tv1);
4603 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_SHF_TO_AND);
4608 } /* tarval != bad */
4611 if (changed & 2) /* need a new Const */
4612 right = new_Const(tv);
4614 if ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) && is_Const(right) && is_Const_null(right) && is_Proj(left)) {
4615 ir_node *op = get_Proj_pred(left);
4617 if ((is_Mod(op) && get_Proj_proj(left) == pn_Mod_res) ||
4618 (is_DivMod(op) && get_Proj_proj(left) == pn_DivMod_res_mod)) {
4619 ir_node *c = get_binop_right(op);
4622 tarval *tv = get_Const_tarval(c);
4624 if (tarval_is_single_bit(tv)) {
4625 /* special case: (x % 2^n) CMP 0 ==> x & (2^n-1) CMP 0 */
4626 ir_node *v = get_binop_left(op);
4627 ir_node *blk = get_irn_n(op, -1);
4628 ir_mode *mode = get_irn_mode(v);
4630 tv = tarval_sub(tv, get_mode_one(mode), NULL);
4631 left = new_rd_And(get_irn_dbg_info(op), current_ir_graph, blk, v, new_Const(tv), mode);
4633 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_MOD_TO_AND);
4640 ir_node *block = get_nodes_block(n);
4642 /* create a new compare */
4643 n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph, block, left, right);
4644 proj = new_rd_Proj(get_irn_dbg_info(proj), current_ir_graph, block, n, get_irn_mode(proj), proj_nr);
4648 } /* transform_node_Proj_Cmp */
4651 * Optimize CopyB(mem, x, x) into a Nop.
4653 static ir_node *transform_node_Proj_CopyB(ir_node *proj) {
4654 ir_node *copyb = get_Proj_pred(proj);
4655 ir_node *a = get_CopyB_dst(copyb);
4656 ir_node *b = get_CopyB_src(copyb);
4659 switch (get_Proj_proj(proj)) {
4660 case pn_CopyB_X_regular:
4661 /* Turn CopyB into a tuple (mem, jmp, bad, bad) */
4662 DBG_OPT_EXC_REM(proj);
4663 proj = new_r_Jmp(current_ir_graph, get_nodes_block(copyb));
4665 case pn_CopyB_M_except:
4666 case pn_CopyB_X_except:
4667 DBG_OPT_EXC_REM(proj);
4668 proj = get_irg_bad(current_ir_graph);
4675 } /* transform_node_Proj_CopyB */
4678 * Optimize Bounds(idx, idx, upper) into idx.
4680 static ir_node *transform_node_Proj_Bound(ir_node *proj) {
4681 ir_node *oldn = proj;
4682 ir_node *bound = get_Proj_pred(proj);
4683 ir_node *idx = get_Bound_index(bound);
4684 ir_node *pred = skip_Proj(idx);
4687 if (idx == get_Bound_lower(bound))
4689 else if (is_Bound(pred)) {
4691 * idx was Bounds checked in the same MacroBlock previously,
4692 * it is still valid if lower <= pred_lower && pred_upper <= upper.
4694 ir_node *lower = get_Bound_lower(bound);
4695 ir_node *upper = get_Bound_upper(bound);
4696 if (get_Bound_lower(pred) == lower &&
4697 get_Bound_upper(pred) == upper &&
4698 get_irn_MacroBlock(bound) == get_irn_MacroBlock(pred)) {
4700 * One could expect that we simply return the previous
4701 * Bound here. However, this would be wrong, as we could
4702 * add an exception Proj to a new location then.
4703 * So, we must turn in into a tuple.
4709 /* Turn Bound into a tuple (mem, jmp, bad, idx) */
4710 switch (get_Proj_proj(proj)) {
4712 DBG_OPT_EXC_REM(proj);
4713 proj = get_Bound_mem(bound);
4715 case pn_Bound_X_except:
4716 DBG_OPT_EXC_REM(proj);
4717 proj = get_irg_bad(current_ir_graph);
4721 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
4723 case pn_Bound_X_regular:
4724 DBG_OPT_EXC_REM(proj);
4725 proj = new_r_Jmp(current_ir_graph, get_nodes_block(bound));
4732 } /* transform_node_Proj_Bound */
4735 * Does all optimizations on nodes that must be done on it's Proj's
4736 * because of creating new nodes.
4738 static ir_node *transform_node_Proj(ir_node *proj) {
4739 ir_node *n = get_Proj_pred(proj);
4741 if (n->op->ops.transform_node_Proj)
4742 return n->op->ops.transform_node_Proj(proj);
4744 } /* transform_node_Proj */
4747 * Move Confirms down through Phi nodes.
4749 static ir_node *transform_node_Phi(ir_node *phi) {
4751 ir_mode *mode = get_irn_mode(phi);
4753 if (mode_is_reference(mode)) {
4754 n = get_irn_arity(phi);
4756 /* Beware of Phi0 */
4758 ir_node *pred = get_irn_n(phi, 0);
4759 ir_node *bound, *new_Phi, *block, **in;
4762 if (! is_Confirm(pred))
4765 bound = get_Confirm_bound(pred);
4766 pnc = get_Confirm_cmp(pred);
4768 NEW_ARR_A(ir_node *, in, n);
4769 in[0] = get_Confirm_value(pred);
4771 for (i = 1; i < n; ++i) {
4772 pred = get_irn_n(phi, i);
4774 if (! is_Confirm(pred) ||
4775 get_Confirm_bound(pred) != bound ||
4776 get_Confirm_cmp(pred) != pnc)
4778 in[i] = get_Confirm_value(pred);
4780 /* move the Confirm nodes "behind" the Phi */
4781 block = get_irn_n(phi, -1);
4782 new_Phi = new_r_Phi(current_ir_graph, block, n, in, get_irn_mode(phi));
4783 return new_r_Confirm(current_ir_graph, block, new_Phi, bound, pnc);
4787 } /* transform_node_Phi */
4790 * Returns the operands of a commutative bin-op, if one operand is
4791 * a const, it is returned as the second one.
4793 static void get_comm_Binop_Ops(ir_node *binop, ir_node **a, ir_node **c) {
4794 ir_node *op_a = get_binop_left(binop);
4795 ir_node *op_b = get_binop_right(binop);
4797 assert(is_op_commutative(get_irn_op(binop)));
4799 if (is_Const(op_a)) {
4806 } /* get_comm_Binop_Ops */
4809 * Optimize a Or(And(Or(And(v,c4),c3),c2),c1) pattern if possible.
4810 * Such pattern may arise in bitfield stores.
4812 * value c4 value c4 & c2
4813 * AND c3 AND c1 | c3
4820 * AND c1 ===> OR if (c1 | c2) == 0x111..11
4823 static ir_node *transform_node_Or_bf_store(ir_node *or) {
4826 ir_node *and_l, *c3;
4827 ir_node *value, *c4;
4828 ir_node *new_and, *new_const, *block;
4829 ir_mode *mode = get_irn_mode(or);
4831 tarval *tv1, *tv2, *tv3, *tv4, *tv, *n_tv4, *n_tv2;
4834 get_comm_Binop_Ops(or, &and, &c1);
4835 if (!is_Const(c1) || !is_And(and))
4838 get_comm_Binop_Ops(and, &or_l, &c2);
4842 tv1 = get_Const_tarval(c1);
4843 tv2 = get_Const_tarval(c2);
4845 tv = tarval_or(tv1, tv2);
4846 if (tarval_is_all_one(tv)) {
4847 /* the AND does NOT clear a bit with isn't set by the OR */
4848 set_Or_left(or, or_l);
4849 set_Or_right(or, c1);
4851 /* check for more */
4858 get_comm_Binop_Ops(or_l, &and_l, &c3);
4859 if (!is_Const(c3) || !is_And(and_l))
4862 get_comm_Binop_Ops(and_l, &value, &c4);
4866 /* ok, found the pattern, check for conditions */
4867 assert(mode == get_irn_mode(and));
4868 assert(mode == get_irn_mode(or_l));
4869 assert(mode == get_irn_mode(and_l));
4871 tv3 = get_Const_tarval(c3);
4872 tv4 = get_Const_tarval(c4);
4874 tv = tarval_or(tv4, tv2);
4875 if (!tarval_is_all_one(tv)) {
4876 /* have at least one 0 at the same bit position */
4880 n_tv4 = tarval_not(tv4);
4881 if (tv3 != tarval_and(tv3, n_tv4)) {
4882 /* bit in the or_mask is outside the and_mask */
4886 n_tv2 = tarval_not(tv2);
4887 if (tv1 != tarval_and(tv1, n_tv2)) {
4888 /* bit in the or_mask is outside the and_mask */
4892 /* ok, all conditions met */
4893 block = get_irn_n(or, -1);
4895 new_and = new_r_And(current_ir_graph, block,
4896 value, new_Const(tarval_and(tv4, tv2)), mode);
4898 new_const = new_Const(tarval_or(tv3, tv1));
4900 set_Or_left(or, new_and);
4901 set_Or_right(or, new_const);
4903 /* check for more */
4905 } /* transform_node_Or_bf_store */
4908 * Optimize an Or(shl(x, c), shr(x, bits - c)) into a Rotl
4910 static ir_node *transform_node_Or_Rotl(ir_node *or) {
4911 ir_mode *mode = get_irn_mode(or);
4912 ir_node *shl, *shr, *block;
4913 ir_node *irn, *x, *c1, *c2, *v, *sub, *n, *rotval;
4916 if (! mode_is_int(mode))
4919 shl = get_binop_left(or);
4920 shr = get_binop_right(or);
4929 } else if (!is_Shl(shl)) {
4931 } else if (!is_Shr(shr)) {
4934 x = get_Shl_left(shl);
4935 if (x != get_Shr_left(shr))
4938 c1 = get_Shl_right(shl);
4939 c2 = get_Shr_right(shr);
4940 if (is_Const(c1) && is_Const(c2)) {
4941 tv1 = get_Const_tarval(c1);
4942 if (! tarval_is_long(tv1))
4945 tv2 = get_Const_tarval(c2);
4946 if (! tarval_is_long(tv2))
4949 if (get_tarval_long(tv1) + get_tarval_long(tv2)
4950 != (int) get_mode_size_bits(mode))
4953 /* yet, condition met */
4954 block = get_nodes_block(or);
4956 n = new_r_Rotl(current_ir_graph, block, x, c1, mode);
4958 DBG_OPT_ALGSIM1(or, shl, shr, n, FS_OPT_OR_SHFT_TO_ROTL);
4965 rotval = sub; /* a Rot right is not supported, so use a rot left */
4966 } else if (is_Sub(c2)) {
4972 if (get_Sub_right(sub) != v)
4975 c1 = get_Sub_left(sub);
4979 tv1 = get_Const_tarval(c1);
4980 if (! tarval_is_long(tv1))
4983 if (get_tarval_long(tv1) != (int) get_mode_size_bits(mode))
4986 /* yet, condition met */
4987 block = get_nodes_block(or);
4989 n = new_r_Rotl(current_ir_graph, block, x, rotval, mode);
4991 DBG_OPT_ALGSIM0(or, n, FS_OPT_OR_SHFT_TO_ROTL);
4993 } /* transform_node_Or_Rotl */
4998 static ir_node *transform_node_Or(ir_node *n) {
4999 ir_node *c, *oldn = n;
5000 ir_node *a = get_Or_left(n);
5001 ir_node *b = get_Or_right(n);
5004 if (is_Not(a) && is_Not(b)) {
5005 /* ~a | ~b = ~(a&b) */
5006 ir_node *block = get_nodes_block(n);
5008 mode = get_irn_mode(n);
5011 n = new_rd_And(get_irn_dbg_info(n), current_ir_graph, block, a, b, mode);
5012 n = new_rd_Not(get_irn_dbg_info(n), current_ir_graph, block, n, mode);
5013 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_DEMORGAN);
5017 /* we can evaluate 2 Projs of the same Cmp */
5018 if (get_irn_mode(n) == mode_b && is_Proj(a) && is_Proj(b)) {
5019 ir_node *pred_a = get_Proj_pred(a);
5020 ir_node *pred_b = get_Proj_pred(b);
5021 if (pred_a == pred_b) {
5022 dbg_info *dbgi = get_irn_dbg_info(n);
5023 ir_node *block = get_nodes_block(pred_a);
5024 pn_Cmp pn_a = get_Proj_proj(a);
5025 pn_Cmp pn_b = get_Proj_proj(b);
5026 /* yes, we can simply calculate with pncs */
5027 pn_Cmp new_pnc = pn_a | pn_b;
5029 return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
5034 mode = get_irn_mode(n);
5035 HANDLE_BINOP_PHI(tarval_or, a, b, c, mode);
5037 n = transform_node_Or_bf_store(n);
5038 n = transform_node_Or_Rotl(n);
5042 n = transform_bitwise_distributive(n, transform_node_Or);
5045 } /* transform_node_Or */
5049 static ir_node *transform_node(ir_node *n);
5052 * Optimize (a >> c1) >> c2), works for Shr, Shrs, Shl, Rotl.
5054 * Should be moved to reassociation?
5056 static ir_node *transform_node_shift(ir_node *n) {
5057 ir_node *left, *right;
5059 tarval *tv1, *tv2, *res;
5060 ir_node *in[2], *irn, *block;
5062 left = get_binop_left(n);
5064 /* different operations */
5065 if (get_irn_op(left) != get_irn_op(n))
5068 right = get_binop_right(n);
5069 tv1 = value_of(right);
5070 if (tv1 == tarval_bad)
5073 tv2 = value_of(get_binop_right(left));
5074 if (tv2 == tarval_bad)
5077 res = tarval_add(tv1, tv2);
5078 mode = get_irn_mode(n);
5080 /* beware: a simple replacement works only, if res < modulo shift */
5082 int modulo_shf = get_mode_modulo_shift(mode);
5083 if (modulo_shf > 0) {
5084 tarval *modulo = new_tarval_from_long(modulo_shf,
5085 get_tarval_mode(res));
5087 assert(modulo_shf >= (int) get_mode_size_bits(mode));
5089 /* shifting too much */
5090 if (!(tarval_cmp(res, modulo) & pn_Cmp_Lt)) {
5092 ir_graph *irg = get_irn_irg(n);
5093 ir_node *block = get_nodes_block(n);
5094 dbg_info *dbgi = get_irn_dbg_info(n);
5095 ir_mode *smode = get_irn_mode(right);
5096 ir_node *cnst = new_Const_long(smode, get_mode_size_bits(mode) - 1);
5097 return new_rd_Shrs(dbgi, irg, block, get_binop_left(left),
5101 return new_Const(get_mode_null(mode));
5105 res = tarval_mod(res, new_tarval_from_long(get_mode_size_bits(mode), get_tarval_mode(res)));
5108 /* ok, we can replace it */
5109 block = get_nodes_block(n);
5111 in[0] = get_binop_left(left);
5112 in[1] = new_Const(res);
5114 irn = new_ir_node(NULL, current_ir_graph, block, get_irn_op(n), mode, 2, in);
5116 DBG_OPT_ALGSIM0(n, irn, FS_OPT_REASSOC_SHIFT);
5118 return transform_node(irn);
5119 } /* transform_node_shift */
5122 * normalisation: (x & c1) >> c2 to (x >> c2) & (c1 >> c2)
5124 * - and, or, xor instead of &
5125 * - Shl, Shr, Shrs, rotl instead of >>
5126 * (with a special case for Or/Xor + Shrs)
5128 static ir_node *transform_node_bitop_shift(ir_node *n) {
5130 ir_node *right = get_binop_right(n);
5131 ir_mode *mode = get_irn_mode(n);
5132 ir_node *bitop_left;
5133 ir_node *bitop_right;
5145 assert(is_Shrs(n) || is_Shr(n) || is_Shl(n) || is_Rotl(n));
5147 if (!is_Const(right))
5150 left = get_binop_left(n);
5151 op_left = get_irn_op(left);
5152 if (op_left != op_And && op_left != op_Or && op_left != op_Eor)
5155 /* doing it with Shrs is not legal if the Or/Eor affects the topmost bit */
5156 if (is_Shrs(n) && (op_left == op_Or || op_left == op_Eor)) {
5157 /* TODO: test if sign bit is affectes */
5161 bitop_right = get_binop_right(left);
5162 if (!is_Const(bitop_right))
5165 bitop_left = get_binop_left(left);
5167 irg = get_irn_irg(n);
5168 block = get_nodes_block(n);
5169 dbgi = get_irn_dbg_info(n);
5170 tv1 = get_Const_tarval(bitop_right);
5171 tv2 = get_Const_tarval(right);
5173 assert(get_tarval_mode(tv1) == mode);
5176 new_shift = new_rd_Shl(dbgi, irg, block, bitop_left, right, mode);
5177 tv_shift = tarval_shl(tv1, tv2);
5178 } else if(is_Shr(n)) {
5179 new_shift = new_rd_Shr(dbgi, irg, block, bitop_left, right, mode);
5180 tv_shift = tarval_shr(tv1, tv2);
5181 } else if(is_Shrs(n)) {
5182 new_shift = new_rd_Shrs(dbgi, irg, block, bitop_left, right, mode);
5183 tv_shift = tarval_shrs(tv1, tv2);
5186 new_shift = new_rd_Rotl(dbgi, irg, block, bitop_left, right, mode);
5187 tv_shift = tarval_rotl(tv1, tv2);
5190 assert(get_tarval_mode(tv_shift) == mode);
5191 new_const = new_Const(tv_shift);
5193 if (op_left == op_And) {
5194 new_bitop = new_rd_And(dbgi, irg, block, new_shift, new_const, mode);
5195 } else if(op_left == op_Or) {
5196 new_bitop = new_rd_Or(dbgi, irg, block, new_shift, new_const, mode);
5198 assert(op_left == op_Eor);
5199 new_bitop = new_rd_Eor(dbgi, irg, block, new_shift, new_const, mode);
5207 * (x << c1) >> c2 <=> x OP (c2-c1) & ((-1 << c1) >> c2)
5209 * (x >> c1) << c2 <=> x OP (c2-c1) & ((-1 >> c1) << c2)
5210 * (also with x >>s c1 when c1>=c2)
5212 static ir_node *transform_node_shl_shr(ir_node *n) {
5214 ir_node *right = get_binop_right(n);
5230 assert(is_Shl(n) || is_Shr(n) || is_Shrs(n));
5232 if (!is_Const(right))
5235 left = get_binop_left(n);
5236 mode = get_irn_mode(n);
5237 if (is_Shl(n) && (is_Shr(left) || is_Shrs(left))) {
5238 ir_node *shr_right = get_binop_right(left);
5240 if (!is_Const(shr_right))
5243 x = get_binop_left(left);
5244 tv_shr = get_Const_tarval(shr_right);
5245 tv_shl = get_Const_tarval(right);
5247 if (is_Shrs(left)) {
5248 /* shrs variant only allowed if c1 >= c2 */
5249 if (! (tarval_cmp(tv_shl, tv_shr) & pn_Cmp_Ge))
5252 tv_mask = tarval_shrs(get_mode_all_one(mode), tv_shr);
5255 tv_mask = tarval_shr(get_mode_all_one(mode), tv_shr);
5257 tv_mask = tarval_shl(tv_mask, tv_shl);
5258 } else if(is_Shr(n) && is_Shl(left)) {
5259 ir_node *shl_right = get_Shl_right(left);
5261 if (!is_Const(shl_right))
5264 x = get_Shl_left(left);
5265 tv_shr = get_Const_tarval(right);
5266 tv_shl = get_Const_tarval(shl_right);
5268 tv_mask = tarval_shl(get_mode_all_one(mode), tv_shl);
5269 tv_mask = tarval_shr(tv_mask, tv_shr);
5274 if (get_tarval_mode(tv_shl) != get_tarval_mode(tv_shr)) {
5275 tv_shl = tarval_convert_to(tv_shl, get_tarval_mode(tv_shr));
5278 assert(tv_mask != tarval_bad);
5279 assert(get_tarval_mode(tv_mask) == mode);
5281 irg = get_irn_irg(n);
5282 block = get_nodes_block(n);
5283 dbgi = get_irn_dbg_info(n);
5285 pnc = tarval_cmp(tv_shl, tv_shr);
5286 if (pnc == pn_Cmp_Lt || pnc == pn_Cmp_Eq) {
5287 tv_shift = tarval_sub(tv_shr, tv_shl, NULL);
5288 new_const = new_Const(tv_shift);
5290 new_shift = new_rd_Shrs(dbgi, irg, block, x, new_const, mode);
5292 new_shift = new_rd_Shr(dbgi, irg, block, x, new_const, mode);
5295 assert(pnc == pn_Cmp_Gt);
5296 tv_shift = tarval_sub(tv_shl, tv_shr, NULL);
5297 new_const = new_Const(tv_shift);
5298 new_shift = new_rd_Shl(dbgi, irg, block, x, new_const, mode);
5301 new_const = new_Const(tv_mask);
5302 new_and = new_rd_And(dbgi, irg, block, new_shift, new_const, mode);
5310 static ir_node *transform_node_Shr(ir_node *n) {
5311 ir_node *c, *oldn = n;
5312 ir_node *left = get_Shr_left(n);
5313 ir_node *right = get_Shr_right(n);
5314 ir_mode *mode = get_irn_mode(n);
5316 HANDLE_BINOP_PHI(tarval_shr, left, right, c, mode);
5317 n = transform_node_shift(n);
5320 n = transform_node_shl_shr(n);
5322 n = transform_node_bitop_shift(n);
5325 } /* transform_node_Shr */
5330 static ir_node *transform_node_Shrs(ir_node *n) {
5331 ir_node *c, *oldn = n;
5332 ir_node *a = get_Shrs_left(n);
5333 ir_node *b = get_Shrs_right(n);
5334 ir_mode *mode = get_irn_mode(n);
5336 HANDLE_BINOP_PHI(tarval_shrs, a, b, c, mode);
5337 n = transform_node_shift(n);
5340 n = transform_node_bitop_shift(n);
5343 } /* transform_node_Shrs */
5348 static ir_node *transform_node_Shl(ir_node *n) {
5349 ir_node *c, *oldn = n;
5350 ir_node *a = get_Shl_left(n);
5351 ir_node *b = get_Shl_right(n);
5352 ir_mode *mode = get_irn_mode(n);
5354 HANDLE_BINOP_PHI(tarval_shl, a, b, c, mode);
5355 n = transform_node_shift(n);
5358 n = transform_node_shl_shr(n);
5360 n = transform_node_bitop_shift(n);
5363 } /* transform_node_Shl */
5368 static ir_node *transform_node_Rotl(ir_node *n) {
5369 ir_node *c, *oldn = n;
5370 ir_node *a = get_Rotl_left(n);
5371 ir_node *b = get_Rotl_right(n);
5372 ir_mode *mode = get_irn_mode(n);
5374 HANDLE_BINOP_PHI(tarval_rotl, a, b, c, mode);
5375 n = transform_node_shift(n);
5378 n = transform_node_bitop_shift(n);
5381 } /* transform_node_Rotl */
5386 static ir_node *transform_node_Conv(ir_node *n) {
5387 ir_node *c, *oldn = n;
5388 ir_mode *mode = get_irn_mode(n);
5389 ir_node *a = get_Conv_op(n);
5391 if (mode != mode_b && is_const_Phi(a)) {
5392 /* Do NOT optimize mode_b Conv's, this leads to remaining
5393 * Phib nodes later, because the conv_b_lower operation
5394 * is instantly reverted, when it tries to insert a Convb.
5396 c = apply_conv_on_phi(a, mode);
5398 DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI);
5403 if (is_Unknown(a)) { /* Conv_A(Unknown_B) -> Unknown_A */
5404 return new_r_Unknown(current_ir_graph, mode);
5407 if (mode_is_reference(mode) &&
5408 get_mode_size_bits(mode) == get_mode_size_bits(get_irn_mode(a)) &&
5410 ir_node *l = get_Add_left(a);
5411 ir_node *r = get_Add_right(a);
5412 dbg_info *dbgi = get_irn_dbg_info(a);
5413 ir_node *block = get_nodes_block(n);
5415 ir_node *lop = get_Conv_op(l);
5416 if(get_irn_mode(lop) == mode) {
5417 /* ConvP(AddI(ConvI(P), x)) -> AddP(P, x) */
5418 n = new_rd_Add(dbgi, current_ir_graph, block, lop, r, mode);
5423 ir_node *rop = get_Conv_op(r);
5424 if(get_irn_mode(rop) == mode) {
5425 /* ConvP(AddI(x, ConvI(P))) -> AddP(x, P) */
5426 n = new_rd_Add(dbgi, current_ir_graph, block, l, rop, mode);
5433 } /* transform_node_Conv */
5436 * Remove dead blocks and nodes in dead blocks
5437 * in keep alive list. We do not generate a new End node.
5439 static ir_node *transform_node_End(ir_node *n) {
5440 int i, j, n_keepalives = get_End_n_keepalives(n);
5443 NEW_ARR_A(ir_node *, in, n_keepalives);
5445 for (i = j = 0; i < n_keepalives; ++i) {
5446 ir_node *ka = get_End_keepalive(n, i);
5448 if (! is_Block_dead(ka)) {
5452 } else if (is_irn_pinned_in_irg(ka) && is_Block_dead(get_nodes_block(ka))) {
5454 } else if (is_Bad(ka)) {
5455 /* no need to keep Bad */
5460 if (j != n_keepalives)
5461 set_End_keepalives(n, j, in);
5463 } /* transform_node_End */
5465 /** returns 1 if a == -b */
5466 static int is_negated_value(ir_node *a, ir_node *b) {
5467 if (is_Minus(a) && get_Minus_op(a) == b)
5469 if (is_Minus(b) && get_Minus_op(b) == a)
5471 if (is_Sub(a) && is_Sub(b)) {
5472 ir_node *a_left = get_Sub_left(a);
5473 ir_node *a_right = get_Sub_right(a);
5474 ir_node *b_left = get_Sub_left(b);
5475 ir_node *b_right = get_Sub_right(b);
5477 if (a_left == b_right && a_right == b_left)
5485 * Optimize a Mux into some simpler cases.
5487 static ir_node *transform_node_Mux(ir_node *n) {
5488 ir_node *oldn = n, *sel = get_Mux_sel(n);
5489 ir_mode *mode = get_irn_mode(n);
5490 ir_node *t = get_Mux_true(n);
5491 ir_node *f = get_Mux_false(n);
5492 ir_graph *irg = current_ir_graph;
5495 ir_node* block = get_nodes_block(n);
5497 ir_node* c1 = get_Mux_sel(t);
5498 ir_node* t1 = get_Mux_true(t);
5499 ir_node* f1 = get_Mux_false(t);
5501 /* Mux(cond0, Mux(cond1, x, y), y) -> typical if (cond0 && cond1) x else y */
5502 ir_node* and_ = new_r_And(irg, block, c0, c1, mode_b);
5503 ir_node* new_mux = new_r_Mux(irg, block, and_, f1, t1, mode);
5508 DBG_OPT_ALGSIM0(oldn, t, FS_OPT_MUX_COMBINE);
5509 } else if (f == t1) {
5510 /* Mux(cond0, Mux(cond1, x, y), x) */
5511 ir_node* not_c1 = new_r_Not(irg, block, c1, mode_b);
5512 ir_node* and_ = new_r_And(irg, block, c0, not_c1, mode_b);
5513 ir_node* new_mux = new_r_Mux(irg, block, and_, t1, f1, mode);
5518 DBG_OPT_ALGSIM0(oldn, t, FS_OPT_MUX_COMBINE);
5520 } else if (is_Mux(f)) {
5521 ir_node* block = get_nodes_block(n);
5523 ir_node* c1 = get_Mux_sel(f);
5524 ir_node* t1 = get_Mux_true(f);
5525 ir_node* f1 = get_Mux_false(f);
5527 /* Mux(cond0, x, Mux(cond1, x, y)) -> typical if (cond0 || cond1) x else y */
5528 ir_node* or_ = new_r_Or(irg, block, c0, c1, mode_b);
5529 ir_node* new_mux = new_r_Mux(irg, block, or_, f1, t1, mode);
5534 DBG_OPT_ALGSIM0(oldn, f, FS_OPT_MUX_COMBINE);
5535 } else if (t == f1) {
5536 /* Mux(cond0, x, Mux(cond1, y, x)) */
5537 ir_node* not_c1 = new_r_Not(irg, block, c1, mode_b);
5538 ir_node* or_ = new_r_Or(irg, block, c0, not_c1, mode_b);
5539 ir_node* new_mux = new_r_Mux(irg, block, or_, t1, f1, mode);
5544 DBG_OPT_ALGSIM0(oldn, f, FS_OPT_MUX_COMBINE);
5548 /* first normalization step: move a possible zero to the false case */
5550 ir_node *cmp = get_Proj_pred(sel);
5553 if (is_Const(t) && is_Const_null(t)) {
5556 /* Mux(x, 0, y) => Mux(x, y, 0) */
5557 pn_Cmp pnc = get_Proj_proj(sel);
5558 sel = new_r_Proj(irg, get_nodes_block(cmp), cmp, mode_b,
5559 get_negated_pnc(pnc, get_irn_mode(get_Cmp_left(cmp))));
5560 n = new_rd_Mux(get_irn_dbg_info(n), irg, get_nodes_block(n), sel, t, f, mode);
5568 /* note: after normalization, false can only happen on default */
5569 if (mode == mode_b) {
5570 dbg_info *dbg = get_irn_dbg_info(n);
5571 ir_node *block = get_nodes_block(n);
5572 ir_graph *irg = current_ir_graph;
5575 tarval *tv_t = get_Const_tarval(t);
5576 if (tv_t == tarval_b_true) {
5578 /* Muxb(sel, true, false) = sel */
5579 assert(get_Const_tarval(f) == tarval_b_false);
5580 DBG_OPT_ALGSIM0(oldn, sel, FS_OPT_MUX_BOOL);
5583 /* Muxb(sel, true, x) = Or(sel, x) */
5584 n = new_rd_Or(dbg, irg, block, sel, f, mode_b);
5585 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_OR_BOOL);
5589 } else if (is_Const(f)) {
5590 tarval *tv_f = get_Const_tarval(f);
5591 if (tv_f == tarval_b_true) {
5592 /* Muxb(sel, x, true) = Or(Not(sel), x) */
5593 ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
5594 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_ORNOT_BOOL);
5595 n = new_rd_Or(dbg, irg, block, not_sel, t, mode_b);
5598 /* Muxb(sel, x, false) = And(sel, x) */
5599 assert(tv_f == tarval_b_false);
5600 n = new_rd_And(dbg, irg, block, sel, t, mode_b);
5601 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_AND_BOOL);
5607 /* more normalization: try to normalize Mux(x, C1, C2) into Mux(x, +1/-1, 0) op C2 */
5608 if (is_Const(t) && is_Const(f) && mode_is_int(mode)) {
5609 tarval *a = get_Const_tarval(t);
5610 tarval *b = get_Const_tarval(f);
5611 tarval *null = get_tarval_null(mode);
5614 if (tarval_is_one(a) && tarval_is_null(b)) {
5615 ir_node *block = get_nodes_block(n);
5616 ir_node *conv = new_r_Conv(current_ir_graph, block, sel, mode);
5618 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_CONV);
5620 } else if (tarval_is_null(a) && tarval_is_one(b)) {
5621 ir_node *block = get_nodes_block(n);
5622 ir_node *not_ = new_r_Not(current_ir_graph, block, sel, mode_b);
5623 ir_node *conv = new_r_Conv(current_ir_graph, block, not_, mode);
5625 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_CONV);
5628 /* TODO: it's not really clear if that helps in general or should be moved
5629 * to backend, especially with the MUX->Conv transformation above */
5630 if (tarval_cmp(a, b) & pn_Cmp_Gt) {
5631 diff = tarval_sub(a, b, NULL);
5634 diff = tarval_sub(b, a, NULL);
5638 if (diff == get_tarval_one(mode)) {
5639 dbg_info *dbg = get_irn_dbg_info(n);
5640 ir_node *block = get_nodes_block(n);
5641 ir_node *t = new_Const(tarval_sub(a, min, NULL));
5642 ir_node *f = new_Const(tarval_sub(b, min, NULL));
5643 n = new_rd_Mux(dbg, irg, block, sel, f, t, mode);
5644 n = new_rd_Add(dbg, irg, block, n, new_Const(min), mode);
5650 ir_node *cmp = get_Proj_pred(sel);
5651 long pn = get_Proj_proj(sel);
5654 * Note: normalization puts the constant on the right side,
5655 * so we check only one case.
5657 * Note further that these optimization work even for floating point
5658 * with NaN's because -NaN == NaN.
5659 * However, if +0 and -0 is handled differently, we cannot use the Abs/-Abs
5663 ir_node *cmp_r = get_Cmp_right(cmp);
5664 if (is_Const(cmp_r) && is_Const_null(cmp_r)) {
5665 ir_node *block = get_nodes_block(n);
5666 ir_node *cmp_l = get_Cmp_left(cmp);
5668 if (!mode_honor_signed_zeros(mode) && is_negated_value(f, t)) {
5671 if ( (cmp_l == t && (pn == pn_Cmp_Ge || pn == pn_Cmp_Gt))
5672 || (cmp_l == f && (pn == pn_Cmp_Le || pn == pn_Cmp_Lt)))
5674 /* Mux(a >/>= 0, a, -a) = Mux(a </<= 0, -a, a) ==> Abs(a) */
5675 n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph, block,
5677 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
5679 } else if ((cmp_l == t && (pn == pn_Cmp_Le || pn == pn_Cmp_Lt))
5680 || (cmp_l == f && (pn == pn_Cmp_Ge || pn == pn_Cmp_Gt)))
5682 /* Mux(a </<= 0, a, -a) = Mux(a >/>= 0, -a, a) ==> -Abs(a) */
5683 n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph, block,
5685 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph,
5687 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
5692 if (mode_is_int(mode)) {
5694 if ((pn == pn_Cmp_Lg || pn == pn_Cmp_Eq) && is_And(cmp_l)) {
5695 /* Mux((a & b) != 0, c, 0) */
5696 ir_node *and_r = get_And_right(cmp_l);
5699 if (and_r == t && f == cmp_r) {
5700 if (is_Const(t) && tarval_is_single_bit(get_Const_tarval(t))) {
5701 if (pn == pn_Cmp_Lg) {
5702 /* Mux((a & 2^C) != 0, 2^C, 0) */
5704 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5706 /* Mux((a & 2^C) == 0, 2^C, 0) */
5707 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
5708 block, cmp_l, t, mode);
5709 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5714 if (is_Shl(and_r)) {
5715 ir_node *shl_l = get_Shl_left(and_r);
5716 if (is_Const(shl_l) && is_Const_one(shl_l)) {
5717 if (and_r == t && f == cmp_r) {
5718 if (pn == pn_Cmp_Lg) {
5719 /* (a & (1 << n)) != 0, (1 << n), 0) */
5721 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5723 /* (a & (1 << n)) == 0, (1 << n), 0) */
5724 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
5725 block, cmp_l, t, mode);
5726 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5732 and_l = get_And_left(cmp_l);
5733 if (is_Shl(and_l)) {
5734 ir_node *shl_l = get_Shl_left(and_l);
5735 if (is_Const(shl_l) && is_Const_one(shl_l)) {
5736 if (and_l == t && f == cmp_r) {
5737 if (pn == pn_Cmp_Lg) {
5738 /* ((1 << n) & a) != 0, (1 << n), 0) */
5740 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5742 /* ((1 << n) & a) == 0, (1 << n), 0) */
5743 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
5744 block, cmp_l, t, mode);
5745 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5758 } /* transform_node_Mux */
5761 * optimize Sync nodes that have other syncs as input we simply add the inputs
5762 * of the other sync to our own inputs
5764 static ir_node *transform_node_Sync(ir_node *n) {
5765 int arity = get_Sync_n_preds(n);
5768 for (i = 0; i < arity;) {
5769 ir_node *pred = get_Sync_pred(n, i);
5773 if (!is_Sync(pred)) {
5781 pred_arity = get_Sync_n_preds(pred);
5782 for (j = 0; j < pred_arity; ++j) {
5783 ir_node *pred_pred = get_Sync_pred(pred, j);
5788 add_irn_n(n, pred_pred);
5792 if (get_Sync_pred(n, k) == pred_pred) break;
5797 /* rehash the sync node */
5798 add_identities(current_ir_graph->value_table, n);
5801 } /* transform_node_Sync */
5804 * optimize a trampoline Call into a direct Call
5806 static ir_node *transform_node_Call(ir_node *call) {
5807 ir_node *callee = get_Call_ptr(call);
5808 ir_node *adr, *mem, *res, *bl, **in;
5809 ir_type *ctp, *mtp, *tp;
5812 int i, n_res, n_param;
5815 if (! is_Proj(callee))
5817 callee = get_Proj_pred(callee);
5818 if (! is_Builtin(callee))
5820 if (get_Builtin_kind(callee) != ir_bk_inner_trampoline)
5823 mem = get_Call_mem(call);
5825 if (skip_Proj(mem) == callee) {
5826 /* memory is routed to the trampoline, skip */
5827 mem = get_Builtin_mem(callee);
5830 /* build a new call type */
5831 mtp = get_Call_type(call);
5832 id = get_type_ident(mtp);
5833 id = id_mangle(new_id_from_chars("T_", 2), id);
5834 db = get_type_dbg_info(mtp);
5836 n_res = get_method_n_ress(mtp);
5837 n_param = get_method_n_params(mtp);
5838 ctp = new_d_type_method(id, n_param + 1, n_res, db);
5840 for (i = 0; i < n_res; ++i)
5841 set_method_res_type(ctp, i, get_method_res_type(mtp, i));
5843 NEW_ARR_A(ir_node *, in, n_param + 1);
5845 /* FIXME: we don't need a new pointer type in every step */
5846 tp = get_irg_frame_type(current_ir_graph);
5847 id = id_mangle(get_type_ident(tp), new_id_from_chars("_ptr", 4));
5848 tp = new_type_pointer(id, tp, mode_P_data);
5849 set_method_param_type(ctp, 0, tp);
5851 in[0] = get_Builtin_param(callee, 2);
5852 for (i = 0; i < n_param; ++i) {
5853 set_method_param_type(ctp, i + 1, get_method_param_type(mtp, i));
5854 in[i + 1] = get_Call_param(call, i);
5856 var = get_method_variadicity(mtp);
5857 set_method_variadicity(ctp, var);
5858 if (var == variadicity_variadic) {
5859 set_method_first_variadic_param_index(ctp, get_method_first_variadic_param_index(mtp) + 1);
5861 /* When we resolve a trampoline, the function must be called by a this-call */
5862 set_method_calling_convention(ctp, get_method_calling_convention(mtp) | cc_this_call);
5863 set_method_additional_properties(ctp, get_method_additional_properties(mtp));
5865 adr = get_Builtin_param(callee, 1);
5867 db = get_irn_dbg_info(call);
5868 bl = get_nodes_block(call);
5870 res = new_rd_Call(db, current_ir_graph, bl, mem, adr, n_param + 1, in, ctp);
5871 if (get_irn_pinned(call) == op_pin_state_floats)
5872 set_irn_pinned(res, op_pin_state_floats);
5874 } /* transform_node_Call */
5877 * Tries several [inplace] [optimizing] transformations and returns an
5878 * equivalent node. The difference to equivalent_node() is that these
5879 * transformations _do_ generate new nodes, and thus the old node must
5880 * not be freed even if the equivalent node isn't the old one.
5882 static ir_node *transform_node(ir_node *n) {
5886 * Transform_node is the only "optimizing transformation" that might
5887 * return a node with a different opcode. We iterate HERE until fixpoint
5888 * to get the final result.
5892 if (n->op->ops.transform_node)
5893 n = n->op->ops.transform_node(n);
5894 } while (oldn != n);
5897 } /* transform_node */
5900 * Sets the default transform node operation for an ir_op_ops.
5902 * @param code the opcode for the default operation
5903 * @param ops the operations initialized
5908 static ir_op_ops *firm_set_default_transform_node(ir_opcode code, ir_op_ops *ops)
5912 ops->transform_node = transform_node_##a; \
5914 #define CASE_PROJ(a) \
5916 ops->transform_node_Proj = transform_node_Proj_##a; \
5918 #define CASE_PROJ_EX(a) \
5920 ops->transform_node = transform_node_##a; \
5921 ops->transform_node_Proj = transform_node_Proj_##a; \
5930 CASE_PROJ_EX(DivMod);
5965 } /* firm_set_default_transform_node */
5968 /* **************** Common Subexpression Elimination **************** */
5970 /** The size of the hash table used, should estimate the number of nodes
5972 #define N_IR_NODES 512
5974 /** Compares the attributes of two Const nodes. */
5975 static int node_cmp_attr_Const(ir_node *a, ir_node *b) {
5976 return (get_Const_tarval(a) != get_Const_tarval(b))
5977 || (get_Const_type(a) != get_Const_type(b));
5978 } /* node_cmp_attr_Const */
5980 /** Compares the attributes of two Proj nodes. */
5981 static int node_cmp_attr_Proj(ir_node *a, ir_node *b) {
5982 return get_irn_proj_attr(a) != get_irn_proj_attr(b);
5983 } /* node_cmp_attr_Proj */
5985 /** Compares the attributes of two Filter nodes. */
5986 static int node_cmp_attr_Filter(ir_node *a, ir_node *b) {
5987 return get_Filter_proj(a) != get_Filter_proj(b);
5988 } /* node_cmp_attr_Filter */
5990 /** Compares the attributes of two Alloc nodes. */
5991 static int node_cmp_attr_Alloc(ir_node *a, ir_node *b) {
5992 const alloc_attr *pa = get_irn_alloc_attr(a);
5993 const alloc_attr *pb = get_irn_alloc_attr(b);
5994 return (pa->where != pb->where) || (pa->type != pb->type);
5995 } /* node_cmp_attr_Alloc */
5997 /** Compares the attributes of two Free nodes. */
5998 static int node_cmp_attr_Free(ir_node *a, ir_node *b) {
5999 const free_attr *pa = get_irn_free_attr(a);
6000 const free_attr *pb = get_irn_free_attr(b);
6001 return (pa->where != pb->where) || (pa->type != pb->type);
6002 } /* node_cmp_attr_Free */
6004 /** Compares the attributes of two SymConst nodes. */
6005 static int node_cmp_attr_SymConst(ir_node *a, ir_node *b) {
6006 const symconst_attr *pa = get_irn_symconst_attr(a);
6007 const symconst_attr *pb = get_irn_symconst_attr(b);
6008 return (pa->kind != pb->kind)
6009 || (pa->sym.type_p != pb->sym.type_p)
6010 || (pa->tp != pb->tp);
6011 } /* node_cmp_attr_SymConst */
6013 /** Compares the attributes of two Call nodes. */
6014 static int node_cmp_attr_Call(ir_node *a, ir_node *b) {
6015 return get_irn_call_attr(a) != get_irn_call_attr(b);
6016 } /* node_cmp_attr_Call */
6018 /** Compares the attributes of two Sel nodes. */
6019 static int node_cmp_attr_Sel(ir_node *a, ir_node *b) {
6020 const ir_entity *a_ent = get_Sel_entity(a);
6021 const ir_entity *b_ent = get_Sel_entity(b);
6024 (a_ent->kind != b_ent->kind) ||
6025 (a_ent->name != b_ent->name) ||
6026 (a_ent->owner != b_ent->owner) ||
6027 (a_ent->ld_name != b_ent->ld_name) ||
6028 (a_ent->type != b_ent->type);
6030 /* Matze: inlining of functions can produce 2 entities with same type,
6032 return a_ent != b_ent;
6033 } /* node_cmp_attr_Sel */
6035 /** Compares the attributes of two Phi nodes. */
6036 static int node_cmp_attr_Phi(ir_node *a, ir_node *b) {
6037 /* we can only enter this function if both nodes have the same number of inputs,
6038 hence it is enough to check if one of them is a Phi0 */
6040 /* check the Phi0 pos attribute */
6041 return get_irn_phi_attr(a)->u.pos != get_irn_phi_attr(b)->u.pos;
6044 } /* node_cmp_attr_Phi */
6046 /** Compares the attributes of two Conv nodes. */
6047 static int node_cmp_attr_Conv(ir_node *a, ir_node *b) {
6048 return get_Conv_strict(a) != get_Conv_strict(b);
6049 } /* node_cmp_attr_Conv */
6051 /** Compares the attributes of two Cast nodes. */
6052 static int node_cmp_attr_Cast(ir_node *a, ir_node *b) {
6053 return get_Cast_type(a) != get_Cast_type(b);
6054 } /* node_cmp_attr_Cast */
6056 /** Compares the attributes of two Load nodes. */
6057 static int node_cmp_attr_Load(ir_node *a, ir_node *b) {
6058 if (get_Load_volatility(a) == volatility_is_volatile ||
6059 get_Load_volatility(b) == volatility_is_volatile)
6060 /* NEVER do CSE on volatile Loads */
6062 /* do not CSE Loads with different alignment. Be conservative. */
6063 if (get_Load_align(a) != get_Load_align(b))
6066 return get_Load_mode(a) != get_Load_mode(b);
6067 } /* node_cmp_attr_Load */
6069 /** Compares the attributes of two Store nodes. */
6070 static int node_cmp_attr_Store(ir_node *a, ir_node *b) {
6071 /* do not CSE Stores with different alignment. Be conservative. */
6072 if (get_Store_align(a) != get_Store_align(b))
6075 /* NEVER do CSE on volatile Stores */
6076 return (get_Store_volatility(a) == volatility_is_volatile ||
6077 get_Store_volatility(b) == volatility_is_volatile);
6078 } /* node_cmp_attr_Store */
6080 /** Compares two exception attributes */
6081 static int node_cmp_exception(ir_node *a, ir_node *b) {
6082 const except_attr *ea = get_irn_except_attr(a);
6083 const except_attr *eb = get_irn_except_attr(b);
6085 return ea->pin_state != eb->pin_state;
6088 #define node_cmp_attr_Bound node_cmp_exception
6090 /** Compares the attributes of two Div nodes. */
6091 static int node_cmp_attr_Div(ir_node *a, ir_node *b) {
6092 const divmod_attr *ma = get_irn_divmod_attr(a);
6093 const divmod_attr *mb = get_irn_divmod_attr(b);
6094 return ma->exc.pin_state != mb->exc.pin_state ||
6095 ma->resmode != mb->resmode ||
6096 ma->no_remainder != mb->no_remainder;
6097 } /* node_cmp_attr_Div */
6099 /** Compares the attributes of two DivMod nodes. */
6100 static int node_cmp_attr_DivMod(ir_node *a, ir_node *b) {
6101 const divmod_attr *ma = get_irn_divmod_attr(a);
6102 const divmod_attr *mb = get_irn_divmod_attr(b);
6103 return ma->exc.pin_state != mb->exc.pin_state ||
6104 ma->resmode != mb->resmode;
6105 } /* node_cmp_attr_DivMod */
6107 /** Compares the attributes of two Mod nodes. */
6108 static int node_cmp_attr_Mod(ir_node *a, ir_node *b) {
6109 const divmod_attr *ma = get_irn_divmod_attr(a);
6110 const divmod_attr *mb = get_irn_divmod_attr(b);
6111 return ma->exc.pin_state != mb->exc.pin_state ||
6112 ma->resmode != mb->resmode;
6113 } /* node_cmp_attr_Mod */
6115 /** Compares the attributes of two Quot nodes. */
6116 static int node_cmp_attr_Quot(ir_node *a, ir_node *b) {
6117 const divmod_attr *ma = get_irn_divmod_attr(a);
6118 const divmod_attr *mb = get_irn_divmod_attr(b);
6119 return ma->exc.pin_state != mb->exc.pin_state ||
6120 ma->resmode != mb->resmode;
6121 } /* node_cmp_attr_Quot */
6123 /** Compares the attributes of two Confirm nodes. */
6124 static int node_cmp_attr_Confirm(ir_node *a, ir_node *b) {
6125 /* no need to compare the bound, as this is a input */
6126 return (get_Confirm_cmp(a) != get_Confirm_cmp(b));
6127 } /* node_cmp_attr_Confirm */
6129 /** Compares the attributes of two Builtin nodes. */
6130 static int node_cmp_attr_Builtin(ir_node *a, ir_node *b) {
6131 const builtin_attr *ma = get_irn_builtin_attr(a);
6132 const builtin_attr *mb = get_irn_builtin_attr(b);
6134 /* no need to compare the type, equal kind means equal type */
6135 return ma->kind != mb->kind;
6136 } /* node_cmp_attr_Builtin */
6138 /** Compares the attributes of two ASM nodes. */
6139 static int node_cmp_attr_ASM(ir_node *a, ir_node *b) {
6141 const ir_asm_constraint *ca;
6142 const ir_asm_constraint *cb;
6145 if (get_ASM_text(a) != get_ASM_text(b))
6148 /* Should we really check the constraints here? Should be better, but is strange. */
6149 n = get_ASM_n_input_constraints(a);
6150 if (n != get_ASM_n_input_constraints(b))
6153 ca = get_ASM_input_constraints(a);
6154 cb = get_ASM_input_constraints(b);
6155 for (i = 0; i < n; ++i) {
6156 if (ca[i].pos != cb[i].pos || ca[i].constraint != cb[i].constraint)
6160 n = get_ASM_n_output_constraints(a);
6161 if (n != get_ASM_n_output_constraints(b))
6164 ca = get_ASM_output_constraints(a);
6165 cb = get_ASM_output_constraints(b);
6166 for (i = 0; i < n; ++i) {
6167 if (ca[i].pos != cb[i].pos || ca[i].constraint != cb[i].constraint)
6171 n = get_ASM_n_clobbers(a);
6172 if (n != get_ASM_n_clobbers(b))
6175 cla = get_ASM_clobbers(a);
6176 clb = get_ASM_clobbers(b);
6177 for (i = 0; i < n; ++i) {
6178 if (cla[i] != clb[i])
6182 } /* node_cmp_attr_ASM */
6184 /** Compares the inexistent attributes of two Dummy nodes. */
6185 static int node_cmp_attr_Dummy(ir_node *a, ir_node *b)
6193 * Set the default node attribute compare operation for an ir_op_ops.
6195 * @param code the opcode for the default operation
6196 * @param ops the operations initialized
6201 static ir_op_ops *firm_set_default_node_cmp_attr(ir_opcode code, ir_op_ops *ops)
6205 ops->node_cmp_attr = node_cmp_attr_##a; \
6238 } /* firm_set_default_node_cmp_attr */
6241 * Compare function for two nodes in the value table. Gets two
6242 * nodes as parameters. Returns 0 if the nodes are a Common Sub Expression.
6244 int identities_cmp(const void *elt, const void *key) {
6245 ir_node *a = (ir_node *)elt;
6246 ir_node *b = (ir_node *)key;
6249 if (a == b) return 0;
6251 if ((get_irn_op(a) != get_irn_op(b)) ||
6252 (get_irn_mode(a) != get_irn_mode(b))) return 1;
6254 /* compare if a's in and b's in are of equal length */
6255 irn_arity_a = get_irn_intra_arity(a);
6256 if (irn_arity_a != get_irn_intra_arity(b))
6259 if (get_irn_pinned(a) == op_pin_state_pinned) {
6260 /* for pinned nodes, the block inputs must be equal */
6261 if (get_irn_intra_n(a, -1) != get_irn_intra_n(b, -1))
6263 } else if (! get_opt_global_cse()) {
6264 /* for block-local CSE both nodes must be in the same MacroBlock */
6265 if (get_irn_MacroBlock(a) != get_irn_MacroBlock(b))
6269 /* compare a->in[0..ins] with b->in[0..ins] */
6270 for (i = 0; i < irn_arity_a; i++)
6271 if (get_irn_intra_n(a, i) != get_irn_intra_n(b, i))
6275 * here, we already now that the nodes are identical except their
6278 if (a->op->ops.node_cmp_attr)
6279 return a->op->ops.node_cmp_attr(a, b);
6282 } /* identities_cmp */
6285 * Calculate a hash value of a node.
6287 * @param node The IR-node
6289 unsigned ir_node_hash(const ir_node *node) {
6290 return node->op->ops.hash(node);
6291 } /* ir_node_hash */
6294 pset *new_identities(void) {
6295 return new_pset(identities_cmp, N_IR_NODES);
6296 } /* new_identities */
6298 void del_identities(pset *value_table) {
6299 del_pset(value_table);
6300 } /* del_identities */
6302 /* Normalize a node by putting constants (and operands with larger
6303 * node index) on the right (operator side). */
6304 void ir_normalize_node(ir_node *n) {
6305 if (is_op_commutative(get_irn_op(n))) {
6306 ir_node *l = get_binop_left(n);
6307 ir_node *r = get_binop_right(n);
6309 /* For commutative operators perform a OP b == b OP a but keep
6310 * constants on the RIGHT side. This helps greatly in some
6311 * optimizations. Moreover we use the idx number to make the form
6313 if (!operands_are_normalized(l, r)) {
6314 set_binop_left(n, r);
6315 set_binop_right(n, l);
6319 } /* ir_normalize_node */
6322 * Update the nodes after a match in the value table. If both nodes have
6323 * the same MacroBlock but different Blocks, we must ensure that the node
6324 * with the dominating Block (the node that is near to the MacroBlock header
6325 * is stored in the table.
6326 * Because a MacroBlock has only one "non-exception" flow, we don't need
6327 * dominance info here: We known, that one block must dominate the other and
6328 * following the only block input will allow to find it.
6330 static void update_known_irn(ir_node *known_irn, const ir_node *new_ir_node) {
6331 ir_node *known_blk, *new_block, *block, *mbh;
6333 if (get_opt_global_cse()) {
6334 /* Block inputs are meaning less */
6337 known_blk = get_irn_n(known_irn, -1);
6338 new_block = get_irn_n(new_ir_node, -1);
6339 if (known_blk == new_block) {
6340 /* already in the same block */
6344 * We expect the typical case when we built the graph. In that case, the
6345 * known_irn is already the upper one, so checking this should be faster.
6348 mbh = get_Block_MacroBlock(new_block);
6350 if (block == known_blk) {
6351 /* ok, we have found it: known_block dominates new_block as expected */
6356 * We have reached the MacroBlock header NOT founding
6357 * the known_block. new_block must dominate known_block.
6360 set_irn_n(known_irn, -1, new_block);
6363 assert(get_Block_n_cfgpreds(block) == 1);
6364 block = get_Block_cfgpred_block(block, 0);
6366 } /* update_value_table */
6369 * Return the canonical node computing the same value as n.
6370 * Looks up the node in a hash table, enters it in the table
6371 * if it isn't there yet.
6373 * @param value_table the HashSet containing all nodes in the
6375 * @param n the node to look up
6377 * @return a node that computes the same value as n or n if no such
6378 * node could be found
6380 ir_node *identify_remember(pset *value_table, ir_node *n) {
6383 if (!value_table) return n;
6385 ir_normalize_node(n);
6386 /* lookup or insert in hash table with given hash key. */
6387 o = pset_insert(value_table, n, ir_node_hash(n));
6390 update_known_irn(o, n);
6394 } /* identify_remember */
6397 * During construction we set the op_pin_state_pinned flag in the graph right when the
6398 * optimization is performed. The flag turning on procedure global cse could
6399 * be changed between two allocations. This way we are safe.
6401 * @param value_table The value table
6402 * @param n The node to lookup
6404 static inline ir_node *identify_cons(pset *value_table, ir_node *n) {
6407 n = identify_remember(value_table, n);
6408 if (n != old && get_irn_MacroBlock(old) != get_irn_MacroBlock(n))
6409 set_irg_pinned(current_ir_graph, op_pin_state_floats);
6411 } /* identify_cons */
6413 /* Add a node to the identities value table. */
6414 void add_identities(pset *value_table, ir_node *node) {
6415 if (get_opt_cse() && is_no_Block(node))
6416 identify_remember(value_table, node);
6417 } /* add_identities */
6419 /* Visit each node in the value table of a graph. */
6420 void visit_all_identities(ir_graph *irg, irg_walk_func visit, void *env) {
6422 ir_graph *rem = current_ir_graph;
6424 current_ir_graph = irg;
6425 foreach_pset(irg->value_table, node)
6427 current_ir_graph = rem;
6428 } /* visit_all_identities */
6431 * Garbage in, garbage out. If a node has a dead input, i.e., the
6432 * Bad node is input to the node, return the Bad node.
6434 static ir_node *gigo(ir_node *node) {
6436 ir_op *op = get_irn_op(node);
6438 /* remove garbage blocks by looking at control flow that leaves the block
6439 and replacing the control flow by Bad. */
6440 if (get_irn_mode(node) == mode_X) {
6441 ir_node *block = get_nodes_block(skip_Proj(node));
6443 /* Don't optimize nodes in immature blocks. */
6444 if (!get_Block_matured(block))
6446 /* Don't optimize End, may have Bads. */
6447 if (op == op_End) return node;
6449 if (is_Block(block)) {
6450 if (is_Block_dead(block)) {
6451 /* control flow from dead block is dead */
6455 for (i = get_irn_arity(block) - 1; i >= 0; --i) {
6456 if (!is_Bad(get_irn_n(block, i)))
6460 ir_graph *irg = get_irn_irg(block);
6461 /* the start block is never dead */
6462 if (block != get_irg_start_block(irg)
6463 && block != get_irg_end_block(irg)) {
6465 * Do NOT kill control flow without setting
6466 * the block to dead of bad things can happen:
6467 * We get a Block that is not reachable be irg_block_walk()
6468 * but can be found by irg_walk()!
6470 set_Block_dead(block);
6477 /* Blocks, Phis and Tuples may have dead inputs, e.g., if one of the
6478 blocks predecessors is dead. */
6479 if (op != op_Block && op != op_Phi && op != op_Tuple) {
6480 irn_arity = get_irn_arity(node);
6483 * Beware: we can only read the block of a non-floating node.
6485 if (is_irn_pinned_in_irg(node) &&
6486 is_Block_dead(get_nodes_block(skip_Proj(node))))
6489 for (i = 0; i < irn_arity; i++) {
6490 ir_node *pred = get_irn_n(node, i);
6495 /* Propagating Unknowns here seems to be a bad idea, because
6496 sometimes we need a node as a input and did not want that
6498 However, it might be useful to move this into a later phase
6499 (if you think that optimizing such code is useful). */
6500 if (is_Unknown(pred) && mode_is_data(get_irn_mode(node)))
6501 return new_Unknown(get_irn_mode(node));
6506 /* With this code we violate the agreement that local_optimize
6507 only leaves Bads in Block, Phi and Tuple nodes. */
6508 /* If Block has only Bads as predecessors it's garbage. */
6509 /* If Phi has only Bads as predecessors it's garbage. */
6510 if ((op == op_Block && get_Block_matured(node)) || op == op_Phi) {
6511 irn_arity = get_irn_arity(node);
6512 for (i = 0; i < irn_arity; i++) {
6513 if (!is_Bad(get_irn_n(node, i))) break;
6515 if (i == irn_arity) node = new_Bad();
6522 * These optimizations deallocate nodes from the obstack.
6523 * It can only be called if it is guaranteed that no other nodes
6524 * reference this one, i.e., right after construction of a node.
6526 * @param n The node to optimize
6528 * current_ir_graph must be set to the graph of the node!
6530 ir_node *optimize_node(ir_node *n) {
6533 ir_opcode iro = get_irn_opcode(n);
6535 /* Always optimize Phi nodes: part of the construction. */
6536 if ((!get_opt_optimize()) && (iro != iro_Phi)) return n;
6538 /* constant expression evaluation / constant folding */
6539 if (get_opt_constant_folding()) {
6540 /* neither constants nor Tuple values can be evaluated */
6541 if (iro != iro_Const && (get_irn_mode(n) != mode_T)) {
6542 unsigned fp_model = get_irg_fp_model(current_ir_graph);
6543 int old_fp_mode = tarval_fp_ops_enabled();
6545 tarval_enable_fp_ops(! (fp_model & fp_no_float_fold));
6547 /* try to evaluate */
6548 tv = computed_value(n);
6549 if (tv != tarval_bad) {
6551 ir_type *old_tp = get_irn_type(n);
6552 int i, arity = get_irn_arity(n);
6556 * Try to recover the type of the new expression.
6558 for (i = 0; i < arity && !old_tp; ++i)
6559 old_tp = get_irn_type(get_irn_n(n, i));
6562 * we MUST copy the node here temporary, because it's still needed
6563 * for DBG_OPT_CSTEVAL
6565 node_size = offsetof(ir_node, attr) + n->op->attr_size;
6566 oldn = alloca(node_size);
6568 memcpy(oldn, n, node_size);
6569 CLONE_ARR_A(ir_node *, oldn->in, n->in);
6571 /* ARG, copy the in array, we need it for statistics */
6572 memcpy(oldn->in, n->in, ARR_LEN(n->in) * sizeof(n->in[0]));
6574 /* note the inplace edges module */
6575 edges_node_deleted(n, current_ir_graph);
6577 /* evaluation was successful -- replace the node. */
6578 irg_kill_node(current_ir_graph, n);
6581 if (old_tp && get_type_mode(old_tp) == get_tarval_mode(tv))
6582 set_Const_type(nw, old_tp);
6583 DBG_OPT_CSTEVAL(oldn, nw);
6584 tarval_enable_fp_ops(old_fp_mode);
6587 tarval_enable_fp_ops(old_fp_mode);
6591 /* remove unnecessary nodes */
6592 if (get_opt_algebraic_simplification() ||
6593 (iro == iro_Phi) || /* always optimize these nodes. */
6595 (iro == iro_Proj) ||
6596 (iro == iro_Block) ) /* Flags tested local. */
6597 n = equivalent_node(n);
6599 /* Common Subexpression Elimination.
6601 * Checks whether n is already available.
6602 * The block input is used to distinguish different subexpressions. Right
6603 * now all nodes are op_pin_state_pinned to blocks, i.e., the CSE only finds common
6604 * subexpressions within a block.
6607 n = identify_cons(current_ir_graph->value_table, n);
6610 edges_node_deleted(oldn, current_ir_graph);
6612 /* We found an existing, better node, so we can deallocate the old node. */
6613 irg_kill_node(current_ir_graph, oldn);
6617 /* Some more constant expression evaluation that does not allow to
6619 iro = get_irn_opcode(n);
6620 if (get_opt_algebraic_simplification() ||
6621 (iro == iro_Cond) ||
6622 (iro == iro_Proj)) /* Flags tested local. */
6623 n = transform_node(n);
6625 /* Remove nodes with dead (Bad) input.
6626 Run always for transformation induced Bads. */
6629 /* Now we have a legal, useful node. Enter it in hash table for CSE */
6630 if (get_opt_cse() && (get_irn_opcode(n) != iro_Block)) {
6632 n = identify_remember(current_ir_graph->value_table, o);
6638 } /* optimize_node */
6642 * These optimizations never deallocate nodes (in place). This can cause dead
6643 * nodes lying on the obstack. Remove these by a dead node elimination,
6644 * i.e., a copying garbage collection.
6646 ir_node *optimize_in_place_2(ir_node *n) {
6649 ir_opcode iro = get_irn_opcode(n);
6651 if (!get_opt_optimize() && !is_Phi(n)) return n;
6653 /* constant expression evaluation / constant folding */
6654 if (get_opt_constant_folding()) {
6655 /* neither constants nor Tuple values can be evaluated */
6656 if (iro != iro_Const && get_irn_mode(n) != mode_T) {
6657 unsigned fp_model = get_irg_fp_model(current_ir_graph);
6658 int old_fp_mode = tarval_fp_ops_enabled();
6660 tarval_enable_fp_ops((fp_model & fp_strict_algebraic) == 0);
6661 /* try to evaluate */
6662 tv = computed_value(n);
6663 if (tv != tarval_bad) {
6664 /* evaluation was successful -- replace the node. */
6665 ir_type *old_tp = get_irn_type(n);
6666 int i, arity = get_irn_arity(n);
6669 * Try to recover the type of the new expression.
6671 for (i = 0; i < arity && !old_tp; ++i)
6672 old_tp = get_irn_type(get_irn_n(n, i));
6676 if (old_tp && get_type_mode(old_tp) == get_tarval_mode(tv))
6677 set_Const_type(n, old_tp);
6679 DBG_OPT_CSTEVAL(oldn, n);
6680 tarval_enable_fp_ops(old_fp_mode);
6683 tarval_enable_fp_ops(old_fp_mode);
6687 /* remove unnecessary nodes */
6688 if (get_opt_constant_folding() ||
6689 (iro == iro_Phi) || /* always optimize these nodes. */
6690 (iro == iro_Id) || /* ... */
6691 (iro == iro_Proj) || /* ... */
6692 (iro == iro_Block) ) /* Flags tested local. */
6693 n = equivalent_node(n);
6695 /** common subexpression elimination **/
6696 /* Checks whether n is already available. */
6697 /* The block input is used to distinguish different subexpressions. Right
6698 now all nodes are op_pin_state_pinned to blocks, i.e., the cse only finds common
6699 subexpressions within a block. */
6700 if (get_opt_cse()) {
6702 n = identify_remember(current_ir_graph->value_table, o);
6707 /* Some more constant expression evaluation. */
6708 iro = get_irn_opcode(n);
6709 if (get_opt_constant_folding() ||
6710 (iro == iro_Cond) ||
6711 (iro == iro_Proj)) /* Flags tested local. */
6712 n = transform_node(n);
6714 /* Remove nodes with dead (Bad) input.
6715 Run always for transformation induced Bads. */
6718 /* Now we can verify the node, as it has no dead inputs any more. */
6721 /* Now we have a legal, useful node. Enter it in hash table for cse.
6722 Blocks should be unique anyways. (Except the successor of start:
6723 is cse with the start block!) */
6724 if (get_opt_cse() && (get_irn_opcode(n) != iro_Block)) {
6726 n = identify_remember(current_ir_graph->value_table, o);
6732 } /* optimize_in_place_2 */
6735 * Wrapper for external use, set proper status bits after optimization.
6737 ir_node *optimize_in_place(ir_node *n) {
6738 /* Handle graph state */
6739 assert(get_irg_phase_state(current_ir_graph) != phase_building);
6741 if (get_opt_global_cse())
6742 set_irg_pinned(current_ir_graph, op_pin_state_floats);
6743 if (get_irg_outs_state(current_ir_graph) == outs_consistent)
6744 set_irg_outs_inconsistent(current_ir_graph);
6746 /* FIXME: Maybe we could also test whether optimizing the node can
6747 change the control graph. */
6748 set_irg_doms_inconsistent(current_ir_graph);
6749 return optimize_in_place_2(n);
6750 } /* optimize_in_place */
6753 * Calculate a hash value of a Const node.
6755 static unsigned hash_Const(const ir_node *node) {
6758 /* special value for const, as they only differ in their tarval. */
6759 h = HASH_PTR(node->attr.con.tv);
6765 * Calculate a hash value of a SymConst node.
6767 static unsigned hash_SymConst(const ir_node *node) {
6770 /* special value for const, as they only differ in their symbol. */
6771 if (node->attr.symc.kind == symconst_label)
6772 h = (unsigned)node->attr.symc.sym.label;
6774 /* all others are pointers */
6775 h = HASH_PTR(node->attr.symc.sym.type_p);
6779 } /* hash_SymConst */
6782 * Set the default hash operation in an ir_op_ops.
6784 * @param code the opcode for the default operation
6785 * @param ops the operations initialized
6790 static ir_op_ops *firm_set_default_hash(ir_opcode code, ir_op_ops *ops)
6794 ops->hash = hash_##a; \
6797 /* hash function already set */
6798 if (ops->hash != NULL)
6805 /* use input/mode default hash if no function was given */
6806 ops->hash = firm_default_hash;
6814 * Sets the default operation for an ir_ops.
6816 ir_op_ops *firm_set_default_operations(ir_opcode code, ir_op_ops *ops) {
6817 ops = firm_set_default_hash(code, ops);
6818 ops = firm_set_default_computed_value(code, ops);
6819 ops = firm_set_default_equivalent_node(code, ops);
6820 ops = firm_set_default_transform_node(code, ops);
6821 ops = firm_set_default_node_cmp_attr(code, ops);
6822 ops = firm_set_default_get_type(code, ops);
6823 ops = firm_set_default_get_type_attr(code, ops);
6824 ops = firm_set_default_get_entity_attr(code, ops);
6827 } /* firm_set_default_operations */