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
33 #include "irgraph_t.h"
34 #include "iredges_t.h"
41 #include "dbginfo_t.h"
42 #include "iropt_dbg.h"
48 #include "opt_confirms.h"
49 #include "opt_polymorphy.h"
53 /* Make types visible to allow most efficient access */
57 * Returns the tarval of a Const node or tarval_bad for all other nodes.
59 static tarval *default_value_of(const ir_node *n) {
61 return get_Const_tarval(n); /* might return tarval_bad */
66 value_of_func value_of_ptr = default_value_of;
68 /* * Set a new value_of function. */
69 void set_value_of_func(value_of_func func) {
73 value_of_ptr = default_value_of;
77 * Return the value of a Constant.
79 static tarval *computed_value_Const(const ir_node *n) {
80 return get_Const_tarval(n);
81 } /* computed_value_Const */
84 * Return the value of a 'sizeof', 'alignof' or 'offsetof' SymConst.
86 static tarval *computed_value_SymConst(const ir_node *n) {
90 switch (get_SymConst_kind(n)) {
91 case symconst_type_size:
92 type = get_SymConst_type(n);
93 if (get_type_state(type) == layout_fixed)
94 return new_tarval_from_long(get_type_size_bytes(type), get_irn_mode(n));
96 case symconst_type_align:
97 type = get_SymConst_type(n);
98 if (get_type_state(type) == layout_fixed)
99 return new_tarval_from_long(get_type_alignment_bytes(type), get_irn_mode(n));
101 case symconst_ofs_ent:
102 ent = get_SymConst_entity(n);
103 type = get_entity_owner(ent);
104 if (get_type_state(type) == layout_fixed)
105 return new_tarval_from_long(get_entity_offset(ent), get_irn_mode(n));
111 } /* computed_value_SymConst */
114 * Return the value of an Add.
116 static tarval *computed_value_Add(const ir_node *n) {
117 ir_node *a = get_Add_left(n);
118 ir_node *b = get_Add_right(n);
120 tarval *ta = value_of(a);
121 tarval *tb = value_of(b);
123 if ((ta != tarval_bad) && (tb != tarval_bad))
124 return tarval_add(ta, tb);
127 } /* computed_value_Add */
130 * Return the value of a Sub.
131 * Special case: a - a
133 static tarval *computed_value_Sub(const ir_node *n) {
134 ir_mode *mode = get_irn_mode(n);
135 ir_node *a = get_Sub_left(n);
136 ir_node *b = get_Sub_right(n);
141 if (a == b && !is_Bad(a))
142 return get_mode_null(mode);
147 if ((ta != tarval_bad) && (tb != tarval_bad))
148 return tarval_sub(ta, tb, mode);
151 } /* computed_value_Sub */
154 * Return the value of a Carry.
155 * Special : a op 0, 0 op b
157 static tarval *computed_value_Carry(const ir_node *n) {
158 ir_node *a = get_binop_left(n);
159 ir_node *b = get_binop_right(n);
160 ir_mode *m = get_irn_mode(n);
162 tarval *ta = value_of(a);
163 tarval *tb = value_of(b);
165 if ((ta != tarval_bad) && (tb != tarval_bad)) {
167 return tarval_carry() ? get_mode_one(m) : get_mode_null(m);
169 if (tarval_is_null(ta) || tarval_is_null(tb))
170 return get_mode_null(m);
173 } /* computed_value_Carry */
176 * Return the value of a Borrow.
179 static tarval *computed_value_Borrow(const ir_node *n) {
180 ir_node *a = get_binop_left(n);
181 ir_node *b = get_binop_right(n);
182 ir_mode *m = get_irn_mode(n);
184 tarval *ta = value_of(a);
185 tarval *tb = value_of(b);
187 if ((ta != tarval_bad) && (tb != tarval_bad)) {
188 return tarval_cmp(ta, tb) == pn_Cmp_Lt ? get_mode_one(m) : get_mode_null(m);
189 } else if (tarval_is_null(ta)) {
190 return get_mode_null(m);
193 } /* computed_value_Borrow */
196 * Return the value of an unary Minus.
198 static tarval *computed_value_Minus(const ir_node *n) {
199 ir_node *a = get_Minus_op(n);
200 tarval *ta = value_of(a);
202 if (ta != tarval_bad)
203 return tarval_neg(ta);
206 } /* computed_value_Minus */
209 * Return the value of a Mul.
211 static tarval *computed_value_Mul(const ir_node *n) {
212 ir_node *a = get_Mul_left(n);
213 ir_node *b = get_Mul_right(n);
216 tarval *ta = value_of(a);
217 tarval *tb = value_of(b);
219 mode = get_irn_mode(n);
220 if (mode != get_irn_mode(a)) {
221 /* n * n = 2n bit multiplication */
222 ta = tarval_convert_to(ta, mode);
223 tb = tarval_convert_to(tb, mode);
226 if (ta != tarval_bad && tb != tarval_bad) {
227 return tarval_mul(ta, tb);
229 /* a*0 = 0 or 0*b = 0 */
230 if (ta == get_mode_null(mode))
232 if (tb == get_mode_null(mode))
236 } /* computed_value_Mul */
239 * Return the value of an Abs.
241 static tarval *computed_value_Abs(const ir_node *n) {
242 ir_node *a = get_Abs_op(n);
243 tarval *ta = value_of(a);
245 if (ta != tarval_bad)
246 return tarval_abs(ta);
249 } /* computed_value_Abs */
252 * Return the value of an And.
253 * Special case: a & 0, 0 & b
255 static tarval *computed_value_And(const ir_node *n) {
256 ir_node *a = get_And_left(n);
257 ir_node *b = get_And_right(n);
259 tarval *ta = value_of(a);
260 tarval *tb = value_of(b);
262 if ((ta != tarval_bad) && (tb != tarval_bad)) {
263 return tarval_and (ta, tb);
265 if (tarval_is_null(ta)) return ta;
266 if (tarval_is_null(tb)) return tb;
269 } /* computed_value_And */
272 * Return the value of an Or.
273 * Special case: a | 1...1, 1...1 | b
275 static tarval *computed_value_Or(const ir_node *n) {
276 ir_node *a = get_Or_left(n);
277 ir_node *b = get_Or_right(n);
279 tarval *ta = value_of(a);
280 tarval *tb = value_of(b);
282 if ((ta != tarval_bad) && (tb != tarval_bad)) {
283 return tarval_or (ta, tb);
285 if (tarval_is_all_one(ta)) return ta;
286 if (tarval_is_all_one(tb)) return tb;
289 } /* computed_value_Or */
292 * Return the value of an Eor.
294 static tarval *computed_value_Eor(const ir_node *n) {
295 ir_node *a = get_Eor_left(n);
296 ir_node *b = get_Eor_right(n);
301 return get_mode_null(get_irn_mode(n));
306 if ((ta != tarval_bad) && (tb != tarval_bad)) {
307 return tarval_eor (ta, tb);
310 } /* computed_value_Eor */
313 * Return the value of a Not.
315 static tarval *computed_value_Not(const ir_node *n) {
316 ir_node *a = get_Not_op(n);
317 tarval *ta = value_of(a);
319 if (ta != tarval_bad)
320 return tarval_not(ta);
323 } /* computed_value_Not */
326 * Return the value of a Shl.
328 static tarval *computed_value_Shl(const ir_node *n) {
329 ir_node *a = get_Shl_left(n);
330 ir_node *b = get_Shl_right(n);
332 tarval *ta = value_of(a);
333 tarval *tb = value_of(b);
335 if ((ta != tarval_bad) && (tb != tarval_bad)) {
336 return tarval_shl (ta, tb);
339 } /* computed_value_Shl */
342 * Return the value of a Shr.
344 static tarval *computed_value_Shr(const ir_node *n) {
345 ir_node *a = get_Shr_left(n);
346 ir_node *b = get_Shr_right(n);
348 tarval *ta = value_of(a);
349 tarval *tb = value_of(b);
351 if ((ta != tarval_bad) && (tb != tarval_bad)) {
352 return tarval_shr (ta, tb);
355 } /* computed_value_Shr */
358 * Return the value of a Shrs.
360 static tarval *computed_value_Shrs(const ir_node *n) {
361 ir_node *a = get_Shrs_left(n);
362 ir_node *b = get_Shrs_right(n);
364 tarval *ta = value_of(a);
365 tarval *tb = value_of(b);
367 if ((ta != tarval_bad) && (tb != tarval_bad)) {
368 return tarval_shrs (ta, tb);
371 } /* computed_value_Shrs */
374 * Return the value of a Rotl.
376 static tarval *computed_value_Rotl(const ir_node *n) {
377 ir_node *a = get_Rotl_left(n);
378 ir_node *b = get_Rotl_right(n);
380 tarval *ta = value_of(a);
381 tarval *tb = value_of(b);
383 if ((ta != tarval_bad) && (tb != tarval_bad)) {
384 return tarval_rotl(ta, tb);
387 } /* computed_value_Rotl */
390 * Return the value of a Conv.
392 static tarval *computed_value_Conv(const ir_node *n) {
393 ir_node *a = get_Conv_op(n);
394 tarval *ta = value_of(a);
396 if (ta != tarval_bad)
397 return tarval_convert_to(ta, get_irn_mode(n));
400 } /* computed_value_Conv */
403 * Calculate the value of a Mux: can be evaluated, if the
404 * sel and the right input are known.
406 static tarval *computed_value_Mux(const ir_node *n) {
407 ir_node *sel = get_Mux_sel(n);
408 tarval *ts = value_of(sel);
410 if (ts == get_tarval_b_true()) {
411 ir_node *v = get_Mux_true(n);
414 else if (ts == get_tarval_b_false()) {
415 ir_node *v = get_Mux_false(n);
419 } /* computed_value_Mux */
422 * Calculate the value of a Confirm: can be evaluated,
423 * if it has the form Confirm(x, '=', Const).
425 static tarval *computed_value_Confirm(const ir_node *n) {
427 * Beware: we might produce Phi(Confirm(x == true), Confirm(x == false)).
428 * Do NOT optimize them away (CondEval wants them), so wait until
429 * remove_confirm is activated.
431 if (get_opt_remove_confirm()) {
432 if (get_Confirm_cmp(n) == pn_Cmp_Eq) {
433 tarval *tv = value_of(get_Confirm_bound(n));
434 if (tv != tarval_bad)
438 return value_of(get_Confirm_value(n));
439 } /* computed_value_Confirm */
442 * Return the value of a Proj(Cmp).
444 * This performs a first step of unreachable code elimination.
445 * Proj can not be computed, but folding a Cmp above the Proj here is
446 * not as wasteful as folding a Cmp into a Tuple of 16 Consts of which
448 * There are several case where we can evaluate a Cmp node, see later.
450 static tarval *computed_value_Proj_Cmp(const ir_node *n) {
451 ir_node *a = get_Proj_pred(n);
452 ir_node *aa = get_Cmp_left(a);
453 ir_node *ab = get_Cmp_right(a);
454 long proj_nr = get_Proj_proj(n);
457 * BEWARE: a == a is NOT always True for floating Point values, as
458 * NaN != NaN is defined, so we must check this here.
461 !mode_is_float(get_irn_mode(aa)) || proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Gt)
464 /* This is a trick with the bits used for encoding the Cmp
465 Proj numbers, the following statement is not the same:
466 return new_tarval_from_long (proj_nr == pn_Cmp_Eq, mode_b) */
467 return new_tarval_from_long (proj_nr & pn_Cmp_Eq, mode_b);
470 tarval *taa = value_of(aa);
471 tarval *tab = value_of(ab);
472 ir_mode *mode = get_irn_mode(aa);
475 * The predecessors of Cmp are target values. We can evaluate
478 if ((taa != tarval_bad) && (tab != tarval_bad)) {
479 /* strange checks... */
480 pn_Cmp flags = tarval_cmp(taa, tab);
481 if (flags != pn_Cmp_False) {
482 return new_tarval_from_long (proj_nr & flags, mode_b);
485 /* for integer values, we can check against MIN/MAX */
486 else if (mode_is_int(mode)) {
487 /* MIN <=/> x. This results in true/false. */
488 if (taa == get_mode_min(mode)) {
489 /* a compare with the MIN value */
490 if (proj_nr == pn_Cmp_Le)
491 return get_tarval_b_true();
492 else if (proj_nr == pn_Cmp_Gt)
493 return get_tarval_b_false();
495 /* x >=/< MIN. This results in true/false. */
497 if (tab == get_mode_min(mode)) {
498 /* a compare with the MIN value */
499 if (proj_nr == pn_Cmp_Ge)
500 return get_tarval_b_true();
501 else if (proj_nr == pn_Cmp_Lt)
502 return get_tarval_b_false();
504 /* MAX >=/< x. This results in true/false. */
505 else if (taa == get_mode_max(mode)) {
506 if (proj_nr == pn_Cmp_Ge)
507 return get_tarval_b_true();
508 else if (proj_nr == pn_Cmp_Lt)
509 return get_tarval_b_false();
511 /* x <=/> MAX. This results in true/false. */
512 else if (tab == get_mode_max(mode)) {
513 if (proj_nr == pn_Cmp_Le)
514 return get_tarval_b_true();
515 else if (proj_nr == pn_Cmp_Gt)
516 return get_tarval_b_false();
520 * The predecessors are Allocs or (void*)(0) constants. Allocs never
521 * return NULL, they raise an exception. Therefore we can predict
525 ir_node *aaa = skip_Proj(aa);
526 ir_node *aba = skip_Proj(ab);
528 if ( ( (/* aa is ProjP and aaa is Alloc */
530 && mode_is_reference(get_irn_mode(aa))
532 && ( (/* ab is NULL */
533 mode_is_reference(get_irn_mode(ab))
534 && tarval_is_null(tab))
535 || (/* ab is other Alloc */
537 && mode_is_reference(get_irn_mode(ab))
540 || (/* aa is NULL and aba is Alloc */
541 mode_is_reference(get_irn_mode(aa))
542 && tarval_is_null(taa)
544 && mode_is_reference(get_irn_mode(ab))
547 return new_tarval_from_long(proj_nr & pn_Cmp_Lg, mode_b);
550 return computed_value_Cmp_Confirm(a, aa, ab, proj_nr);
551 } /* computed_value_Proj_Cmp */
554 * Return the value of a floating point Quot.
556 static tarval *do_computed_value_Quot(const ir_node *a, const ir_node *b) {
557 tarval *ta = value_of(a);
558 tarval *tb = value_of(b);
560 /* cannot optimize 0 / b = 0 because of NaN */
561 if (ta != tarval_bad && tb != tarval_bad)
562 return tarval_quo(ta, tb);
564 } /* do_computed_value_Quot */
567 * Calculate the value of an integer Div of two nodes.
568 * Special case: 0 / b
570 static tarval *do_computed_value_Div(const ir_node *a, const ir_node *b) {
571 tarval *ta = value_of(a);
573 const ir_node *dummy;
575 /* Compute c1 / c2 or 0 / a, a != 0 */
576 if (tarval_is_null(ta) && value_not_zero(b, &dummy))
577 return ta; /* 0 / b == 0 */
579 if (ta != tarval_bad && tb != tarval_bad)
580 return tarval_div(ta, tb);
582 } /* do_computed_value_Div */
585 * Calculate the value of an integer Mod of two nodes.
586 * Special case: a % 1
588 static tarval *do_computed_value_Mod(const ir_node *a, const ir_node *b) {
589 tarval *ta = value_of(a);
590 tarval *tb = value_of(b);
592 /* Compute a % 1 or c1 % c2 */
593 if (tarval_is_one(tb))
594 return get_mode_null(get_irn_mode(a));
595 if (ta != tarval_bad && tb != tarval_bad)
596 return tarval_mod(ta, tb);
598 } /* do_computed_value_Mod */
601 * Return the value of a Proj(DivMod).
603 static tarval *computed_value_Proj_DivMod(const ir_node *n) {
604 long proj_nr = get_Proj_proj(n);
606 /* compute either the Div or the Mod part */
607 if (proj_nr == pn_DivMod_res_div) {
608 const ir_node *a = get_Proj_pred(n);
609 return do_computed_value_Div(get_DivMod_left(a), get_DivMod_right(a));
610 } else if (proj_nr == pn_DivMod_res_mod) {
611 const ir_node *a = get_Proj_pred(n);
612 return do_computed_value_Mod(get_DivMod_left(a), get_DivMod_right(a));
615 } /* computed_value_Proj_DivMod */
618 * Return the value of a Proj(Div).
620 static tarval *computed_value_Proj_Div(const ir_node *n) {
621 long proj_nr = get_Proj_proj(n);
623 if (proj_nr == pn_Div_res) {
624 const ir_node *a = get_Proj_pred(n);
625 return do_computed_value_Div(get_Div_left(a), get_Div_right(a));
628 } /* computed_value_Proj_Div */
631 * Return the value of a Proj(Mod).
633 static tarval *computed_value_Proj_Mod(const ir_node *n) {
634 long proj_nr = get_Proj_proj(n);
636 if (proj_nr == pn_Mod_res) {
637 const ir_node *a = get_Proj_pred(n);
638 return do_computed_value_Mod(get_Mod_left(a), get_Mod_right(a));
641 } /* computed_value_Proj_Mod */
644 * Return the value of a Proj(Quot).
646 static tarval *computed_value_Proj_Quot(const ir_node *n) {
647 long proj_nr = get_Proj_proj(n);
649 if (proj_nr == pn_Quot_res) {
650 const ir_node *a = get_Proj_pred(n);
651 return do_computed_value_Quot(get_Quot_left(a), get_Quot_right(a));
654 } /* computed_value_Proj_Quot */
657 * Return the value of a Proj.
659 static tarval *computed_value_Proj(const ir_node *proj) {
660 ir_node *n = get_Proj_pred(proj);
662 if (n->op->ops.computed_value_Proj != NULL)
663 return n->op->ops.computed_value_Proj(proj);
665 } /* computed_value_Proj */
668 * If the parameter n can be computed, return its value, else tarval_bad.
669 * Performs constant folding.
671 * @param n The node this should be evaluated
673 tarval *computed_value(const ir_node *n) {
674 if (n->op->ops.computed_value)
675 return n->op->ops.computed_value(n);
677 } /* computed_value */
680 * Set the default computed_value evaluator in an ir_op_ops.
682 * @param code the opcode for the default operation
683 * @param ops the operations initialized
688 static ir_op_ops *firm_set_default_computed_value(ir_opcode code, ir_op_ops *ops)
692 ops->computed_value = computed_value_##a; \
694 #define CASE_PROJ(a) \
696 ops->computed_value_Proj = computed_value_Proj_##a; \
733 } /* firm_set_default_computed_value */
736 * Returns a equivalent block for another block.
737 * If the block has only one predecessor, this is
738 * the equivalent one. If the only predecessor of a block is
739 * the block itself, this is a dead block.
741 * If both predecessors of a block are the branches of a binary
742 * Cond, the equivalent block is Cond's block.
744 * If all predecessors of a block are bad or lies in a dead
745 * block, the current block is dead as well.
747 * Note, that blocks are NEVER turned into Bad's, instead
748 * the dead_block flag is set. So, never test for is_Bad(block),
749 * always use is_dead_Block(block).
751 static ir_node *equivalent_node_Block(ir_node *n)
756 /* don't optimize dead blocks */
757 if (is_Block_dead(n))
760 n_preds = get_Block_n_cfgpreds(n);
762 /* The Block constructor does not call optimize, but mature_immBlock()
763 calls the optimization. */
764 assert(get_Block_matured(n));
766 /* Straightening: a single entry Block following a single exit Block
767 can be merged, if it is not the Start block. */
768 /* !!! Beware, all Phi-nodes of n must have been optimized away.
769 This should be true, as the block is matured before optimize is called.
770 But what about Phi-cycles with the Phi0/Id that could not be resolved?
771 Remaining Phi nodes are just Ids. */
773 ir_node *pred = skip_Proj(get_Block_cfgpred(n, 0));
776 ir_node *predblock = get_nodes_block(pred);
777 if (predblock == oldn) {
778 /* Jmp jumps into the block it is in -- deal self cycle. */
779 n = set_Block_dead(n);
780 DBG_OPT_DEAD_BLOCK(oldn, n);
781 } else if (get_opt_control_flow_straightening()) {
783 DBG_OPT_STG(oldn, n);
785 } else if (is_Cond(pred)) {
786 ir_node *predblock = get_nodes_block(pred);
787 if (predblock == oldn) {
788 /* Jmp jumps into the block it is in -- deal self cycle. */
789 n = set_Block_dead(n);
790 DBG_OPT_DEAD_BLOCK(oldn, n);
793 } else if ((n_preds == 2) &&
794 (get_opt_control_flow_weak_simplification())) {
795 /* Test whether Cond jumps twice to this block
796 * The more general case which more than 2 predecessors is handles
797 * in optimize_cf(), we handle only this special case for speed here.
799 ir_node *a = get_Block_cfgpred(n, 0);
800 ir_node *b = get_Block_cfgpred(n, 1);
802 if (is_Proj(a) && is_Proj(b)) {
803 ir_node *cond = get_Proj_pred(a);
805 if (cond == get_Proj_pred(b) && is_Cond(cond) &&
806 get_irn_mode(get_Cond_selector(cond)) == mode_b) {
807 /* Also a single entry Block following a single exit Block. Phis have
808 twice the same operand and will be optimized away. */
809 n = get_nodes_block(cond);
810 DBG_OPT_IFSIM1(oldn, a, b, n);
813 } else if (get_opt_unreachable_code() &&
814 (n != get_irg_start_block(current_ir_graph)) &&
815 (n != get_irg_end_block(current_ir_graph)) ) {
818 /* If all inputs are dead, this block is dead too, except if it is
819 the start or end block. This is one step of unreachable code
821 for (i = get_Block_n_cfgpreds(n) - 1; i >= 0; --i) {
822 ir_node *pred = get_Block_cfgpred(n, i);
825 if (is_Bad(pred)) continue;
826 pred_blk = get_nodes_block(skip_Proj(pred));
828 if (is_Block_dead(pred_blk)) continue;
831 /* really found a living input */
836 n = set_Block_dead(n);
837 DBG_OPT_DEAD_BLOCK(oldn, n);
842 } /* equivalent_node_Block */
845 * Returns a equivalent node for a Jmp, a Bad :-)
846 * Of course this only happens if the Block of the Jmp is dead.
848 static ir_node *equivalent_node_Jmp(ir_node *n) {
851 /* unreachable code elimination */
852 if (is_Block_dead(get_nodes_block(n))) {
853 n = get_irg_bad(current_ir_graph);
854 DBG_OPT_DEAD_BLOCK(oldn, n);
857 } /* equivalent_node_Jmp */
859 /** Raise is handled in the same way as Jmp. */
860 #define equivalent_node_Raise equivalent_node_Jmp
863 /* We do not evaluate Cond here as we replace it by a new node, a Jmp.
864 See transform_node_Proj_Cond(). */
867 * Optimize operations that are commutative and have neutral 0,
868 * so a op 0 = 0 op a = a.
870 static ir_node *equivalent_node_neutral_zero(ir_node *n) {
873 ir_node *a = get_binop_left(n);
874 ir_node *b = get_binop_right(n);
879 /* After running compute_node there is only one constant predecessor.
880 Find this predecessors value and remember the other node: */
881 if ((tv = value_of(a)) != tarval_bad) {
883 } else if ((tv = value_of(b)) != tarval_bad) {
888 /* If this predecessors constant value is zero, the operation is
889 * unnecessary. Remove it.
891 * Beware: If n is a Add, the mode of on and n might be different
892 * which happens in this rare construction: NULL + 3.
893 * Then, a Conv would be needed which we cannot include here.
895 if (tarval_is_null(tv) && get_irn_mode(on) == get_irn_mode(n)) {
898 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_0);
902 } /* equivalent_node_neutral_zero */
905 * Eor is commutative and has neutral 0.
907 static ir_node *equivalent_node_Eor(ir_node *n) {
912 n = equivalent_node_neutral_zero(n);
913 if (n != oldn) return n;
916 b = get_Eor_right(n);
919 ir_node *aa = get_Eor_left(a);
920 ir_node *ab = get_Eor_right(a);
923 /* (a ^ b) ^ a -> b */
925 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
927 } else if (ab == b) {
928 /* (a ^ b) ^ b -> a */
930 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
935 ir_node *ba = get_Eor_left(b);
936 ir_node *bb = get_Eor_right(b);
939 /* a ^ (a ^ b) -> b */
941 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
943 } else if (bb == a) {
944 /* a ^ (b ^ a) -> b */
946 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_EOR_A_B_A);
954 * Optimize a - 0 and (a - x) + x (for modes with wrap-around).
956 * The second one looks strange, but this construct
957 * is used heavily in the LCC sources :-).
959 * Beware: The Mode of an Add may be different than the mode of its
960 * predecessors, so we could not return a predecessors in all cases.
962 static ir_node *equivalent_node_Add(ir_node *n) {
964 ir_node *left, *right;
965 ir_mode *mode = get_irn_mode(n);
967 n = equivalent_node_neutral_zero(n);
971 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
972 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
975 left = get_Add_left(n);
976 right = get_Add_right(n);
979 if (get_Sub_right(left) == right) {
982 n = get_Sub_left(left);
983 if (mode == get_irn_mode(n)) {
984 DBG_OPT_ALGSIM1(oldn, left, right, n, FS_OPT_ADD_SUB);
990 if (get_Sub_right(right) == left) {
993 n = get_Sub_left(right);
994 if (mode == get_irn_mode(n)) {
995 DBG_OPT_ALGSIM1(oldn, left, right, n, FS_OPT_ADD_SUB);
1001 } /* equivalent_node_Add */
1004 * optimize operations that are not commutative but have neutral 0 on left,
1007 static ir_node *equivalent_node_left_zero(ir_node *n) {
1010 ir_node *a = get_binop_left(n);
1011 ir_node *b = get_binop_right(n);
1012 tarval *tb = value_of(b);
1014 if (tarval_is_null(tb)) {
1017 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_0);
1020 } /* equivalent_node_left_zero */
1022 #define equivalent_node_Shl equivalent_node_left_zero
1023 #define equivalent_node_Shr equivalent_node_left_zero
1024 #define equivalent_node_Shrs equivalent_node_left_zero
1025 #define equivalent_node_Rotl equivalent_node_left_zero
1028 * Optimize a - 0 and (a + x) - x (for modes with wrap-around).
1030 * The second one looks strange, but this construct
1031 * is used heavily in the LCC sources :-).
1033 * Beware: The Mode of a Sub may be different than the mode of its
1034 * predecessors, so we could not return a predecessors in all cases.
1036 static ir_node *equivalent_node_Sub(ir_node *n) {
1039 ir_mode *mode = get_irn_mode(n);
1042 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
1043 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
1046 b = get_Sub_right(n);
1049 /* Beware: modes might be different */
1050 if (tarval_is_null(tb)) {
1051 ir_node *a = get_Sub_left(n);
1052 if (mode == get_irn_mode(a)) {
1055 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_0);
1059 } /* equivalent_node_Sub */
1063 * Optimize an "self-inverse unary op", ie op(op(n)) = n.
1066 * -(-a) == a, but might overflow two times.
1067 * We handle it anyway here but the better way would be a
1068 * flag. This would be needed for Pascal for instance.
1070 static ir_node *equivalent_node_idempotent_unop(ir_node *n) {
1072 ir_node *pred = get_unop_op(n);
1074 /* optimize symmetric unop */
1075 if (get_irn_op(pred) == get_irn_op(n)) {
1076 n = get_unop_op(pred);
1077 DBG_OPT_ALGSIM2(oldn, pred, n, FS_OPT_IDEM_UNARY);
1080 } /* equivalent_node_idempotent_unop */
1082 /** Optimize Not(Not(x)) == x. */
1083 #define equivalent_node_Not equivalent_node_idempotent_unop
1085 /** -(-x) == x ??? Is this possible or can --x raise an
1086 out of bounds exception if min =! max? */
1087 #define equivalent_node_Minus equivalent_node_idempotent_unop
1090 * Optimize a * 1 = 1 * a = a.
1092 static ir_node *equivalent_node_Mul(ir_node *n) {
1094 ir_node *a = get_Mul_left(n);
1096 /* we can handle here only the n * n = n bit cases */
1097 if (get_irn_mode(n) == get_irn_mode(a)) {
1098 ir_node *b = get_Mul_right(n);
1102 * Mul is commutative and has again an other neutral element.
1103 * Constants are place right, so check this case first.
1106 if (tarval_is_one(tv)) {
1108 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
1111 if (tarval_is_one(tv)) {
1113 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
1118 } /* equivalent_node_Mul */
1121 * Use algebraic simplification a | a = a | 0 = 0 | a = a.
1123 static ir_node *equivalent_node_Or(ir_node *n) {
1126 ir_node *a = get_Or_left(n);
1127 ir_node *b = get_Or_right(n);
1131 n = a; /* Or has it's own neutral element */
1132 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_OR);
1135 /* constants are cormalized to right, check this site first */
1137 if (tarval_is_null(tv)) {
1139 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_OR);
1143 if (tarval_is_null(tv)) {
1145 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_OR);
1150 } /* equivalent_node_Or */
1153 * Optimize a & 0b1...1 = 0b1...1 & a = a & a = (a|X) & a = a.
1155 static ir_node *equivalent_node_And(ir_node *n) {
1158 ir_node *a = get_And_left(n);
1159 ir_node *b = get_And_right(n);
1163 n = a; /* And has it's own neutral element */
1164 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_AND);
1167 /* constants are cormalized to right, check this site first */
1169 if (tarval_is_all_one(tv)) {
1171 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1175 if (tarval_is_all_one(tv)) {
1177 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1181 if (b == get_Or_left(a) || b == get_Or_right(a)) {
1184 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1189 if (a == get_Or_left(b) || a == get_Or_right(b)) {
1192 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_AND);
1197 } /* equivalent_node_And */
1200 * Try to remove useless Conv's:
1202 static ir_node *equivalent_node_Conv(ir_node *n) {
1204 ir_node *a = get_Conv_op(n);
1206 ir_mode *n_mode = get_irn_mode(n);
1207 ir_mode *a_mode = get_irn_mode(a);
1210 if (n_mode == a_mode) { /* No Conv necessary */
1211 if (get_Conv_strict(n)) {
1212 /* special case: the predecessor might be a also a Conv */
1214 if (! get_Conv_strict(a)) {
1215 /* first one is not strict, kick it */
1217 a_mode = get_irn_mode(a);
1221 /* else both are strict conv, second is superfluous */
1224 ir_node *pred = get_Proj_pred(a);
1225 if (is_Load(pred)) {
1226 /* loads always return with the exact precision of n_mode */
1227 assert(get_Load_mode(pred) == n_mode);
1231 /* leave strict floating point Conv's */
1236 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
1237 } else if (is_Conv(a)) { /* Conv(Conv(b)) */
1238 ir_node *b = get_Conv_op(a);
1239 ir_mode *b_mode = get_irn_mode(b);
1241 if (get_Conv_strict(n) && get_Conv_strict(a)) {
1242 /* both are strict conv */
1243 if (smaller_mode(a_mode, n_mode)) {
1244 /* both are strict, but the first is smaller, so
1245 the second cannot remove more precision, remove the
1247 set_Conv_strict(n, 0);
1250 if (n_mode == b_mode) {
1251 if (! get_Conv_strict(n) && ! get_Conv_strict(a)) {
1252 if (n_mode == mode_b) {
1253 n = b; /* Convb(Conv*(xxxb(...))) == xxxb(...) */
1254 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1255 } else if (get_mode_arithmetic(n_mode) == get_mode_arithmetic(a_mode)) {
1256 if (smaller_mode(b_mode, a_mode)) {
1257 n = b; /* ConvS(ConvL(xxxS(...))) == xxxS(...) */
1258 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1262 if (get_mode_arithmetic(n_mode) == irma_twos_complement &&
1263 get_mode_arithmetic(a_mode) == irma_ieee754) {
1264 /* ConvI(ConvF(I)) -> I, iff float mantissa >= int mode */
1265 unsigned int_mantissa = get_mode_size_bits(n_mode) - (mode_is_signed(n_mode) ? 1 : 0);
1266 unsigned float_mantissa = tarval_ieee754_get_mantissa_size(a_mode);
1268 if (float_mantissa >= int_mantissa) {
1270 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1275 if (smaller_mode(b_mode, a_mode)) {
1276 if (get_Conv_strict(n))
1277 set_Conv_strict(b, 1);
1278 n = b; /* ConvA(ConvB(ConvA(...))) == ConvA(...) */
1279 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
1285 } /* equivalent_node_Conv */
1288 * A Cast may be removed if the type of the previous node
1289 * is already the type of the Cast.
1291 static ir_node *equivalent_node_Cast(ir_node *n) {
1293 ir_node *pred = get_Cast_op(n);
1295 if (get_irn_type(pred) == get_Cast_type(n)) {
1297 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CAST);
1300 } /* equivalent_node_Cast */
1303 * - fold Phi-nodes, iff they have only one predecessor except
1306 static ir_node *equivalent_node_Phi(ir_node *n) {
1311 ir_node *first_val = NULL; /* to shutup gcc */
1313 if (!get_opt_normalize()) return n;
1315 n_preds = get_Phi_n_preds(n);
1317 block = get_nodes_block(n);
1318 if (is_Block_dead(block)) /* Control dead */
1319 return get_irg_bad(current_ir_graph);
1321 if (n_preds == 0) return n; /* Phi of dead Region without predecessors. */
1323 /* Find first non-self-referencing input */
1324 for (i = 0; i < n_preds; ++i) {
1325 first_val = get_Phi_pred(n, i);
1326 if ( (first_val != n) /* not self pointer */
1328 /* BEWARE: when the if is changed to 1, Phi's will ignore it's Bad
1329 * predecessors. Then, Phi nodes in dead code might be removed, causing
1330 * nodes pointing to themself (Add's for instance).
1331 * This is really bad and causes endless recursions in several
1332 * code pathes, so we do NOT optimize such a code.
1333 * This is not that bad as it sounds, optimize_cf() removes bad control flow
1334 * (and bad Phi predecessors), so live code is optimized later.
1336 && (! is_Bad(get_Block_cfgpred(block, i)))
1338 ) { /* value not dead */
1339 break; /* then found first value. */
1344 /* A totally Bad or self-referencing Phi (we didn't break the above loop) */
1345 return get_irg_bad(current_ir_graph);
1348 /* search for rest of inputs, determine if any of these
1349 are non-self-referencing */
1350 while (++i < n_preds) {
1351 ir_node *scnd_val = get_Phi_pred(n, i);
1352 if ( (scnd_val != n)
1353 && (scnd_val != first_val)
1356 && (! is_Bad(get_Block_cfgpred(block, i)))
1364 /* Fold, if no multiple distinct non-self-referencing inputs */
1366 DBG_OPT_PHI(oldn, n);
1369 } /* equivalent_node_Phi */
1372 * Several optimizations:
1373 * - fold Sync-nodes, iff they have only one predecessor except
1376 static ir_node *equivalent_node_Sync(ir_node *n) {
1377 int arity = get_Sync_n_preds(n);
1380 for (i = 0; i < arity;) {
1381 ir_node *pred = get_Sync_pred(n, i);
1384 /* Remove Bad predecessors */
1391 /* Remove duplicate predecessors */
1397 if (get_Sync_pred(n, j) == pred) {
1405 if (arity == 0) return get_irg_bad(current_ir_graph);
1406 if (arity == 1) return get_Sync_pred(n, 0);
1408 } /* equivalent_node_Sync */
1411 * Optimize Proj(Tuple).
1413 static ir_node *equivalent_node_Proj_Tuple(ir_node *proj) {
1414 ir_node *oldn = proj;
1415 ir_node *tuple = get_Proj_pred(proj);
1417 /* Remove the Tuple/Proj combination. */
1418 proj = get_Tuple_pred(tuple, get_Proj_proj(proj));
1419 DBG_OPT_TUPLE(oldn, tuple, proj);
1422 } /* equivalent_node_Proj_Tuple */
1425 * Optimize a / 1 = a.
1427 static ir_node *equivalent_node_Proj_Div(ir_node *proj) {
1428 ir_node *oldn = proj;
1429 ir_node *div = get_Proj_pred(proj);
1430 ir_node *b = get_Div_right(div);
1431 tarval *tb = value_of(b);
1433 /* Div is not commutative. */
1434 if (tarval_is_one(tb)) { /* div(x, 1) == x */
1435 switch (get_Proj_proj(proj)) {
1437 proj = get_Div_mem(div);
1438 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1442 proj = get_Div_left(div);
1443 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1447 /* we cannot replace the exception Proj's here, this is done in
1448 transform_node_Proj_Div() */
1453 } /* equivalent_node_Proj_Div */
1456 * Optimize a / 1.0 = a.
1458 static ir_node *equivalent_node_Proj_Quot(ir_node *proj) {
1459 ir_node *oldn = proj;
1460 ir_node *quot = get_Proj_pred(proj);
1461 ir_node *b = get_Quot_right(quot);
1462 tarval *tb = value_of(b);
1464 /* Div is not commutative. */
1465 if (tarval_is_one(tb)) { /* Quot(x, 1) == x */
1466 switch (get_Proj_proj(proj)) {
1468 proj = get_Quot_mem(quot);
1469 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1473 proj = get_Quot_left(quot);
1474 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1478 /* we cannot replace the exception Proj's here, this is done in
1479 transform_node_Proj_Quot() */
1484 } /* equivalent_node_Proj_Quot */
1487 * Optimize a / 1 = a.
1489 static ir_node *equivalent_node_Proj_DivMod(ir_node *proj) {
1490 ir_node *oldn = proj;
1491 ir_node *divmod = get_Proj_pred(proj);
1492 ir_node *b = get_DivMod_right(divmod);
1493 tarval *tb = value_of(b);
1495 /* Div is not commutative. */
1496 if (tarval_is_one(tb)) { /* div(x, 1) == x */
1497 switch (get_Proj_proj(proj)) {
1499 proj = get_DivMod_mem(divmod);
1500 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1503 case pn_DivMod_res_div:
1504 proj = get_DivMod_left(divmod);
1505 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NEUTRAL_1);
1509 /* we cannot replace the exception Proj's here, this is done in
1510 transform_node_Proj_DivMod().
1511 Note further that the pn_DivMod_res_div case is handled in
1512 computed_value_Proj(). */
1517 } /* equivalent_node_Proj_DivMod */
1520 * Optimize CopyB(mem, x, x) into a Nop.
1522 static ir_node *equivalent_node_Proj_CopyB(ir_node *proj) {
1523 ir_node *oldn = proj;
1524 ir_node *copyb = get_Proj_pred(proj);
1525 ir_node *a = get_CopyB_dst(copyb);
1526 ir_node *b = get_CopyB_src(copyb);
1529 /* Turn CopyB into a tuple (mem, jmp, bad, bad) */
1530 switch (get_Proj_proj(proj)) {
1531 case pn_CopyB_M_regular:
1532 proj = get_CopyB_mem(copyb);
1533 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
1536 case pn_CopyB_M_except:
1537 case pn_CopyB_X_except:
1538 DBG_OPT_EXC_REM(proj);
1539 proj = get_irg_bad(current_ir_graph);
1544 } /* equivalent_node_Proj_CopyB */
1547 * Optimize Bounds(idx, idx, upper) into idx.
1549 static ir_node *equivalent_node_Proj_Bound(ir_node *proj) {
1550 ir_node *oldn = proj;
1551 ir_node *bound = get_Proj_pred(proj);
1552 ir_node *idx = get_Bound_index(bound);
1553 ir_node *pred = skip_Proj(idx);
1556 if (idx == get_Bound_lower(bound))
1558 else if (is_Bound(pred)) {
1560 * idx was Bounds checked in the same MacroBlock previously,
1561 * it is still valid if lower <= pred_lower && pred_upper <= upper.
1563 ir_node *lower = get_Bound_lower(bound);
1564 ir_node *upper = get_Bound_upper(bound);
1565 if (get_Bound_lower(pred) == lower &&
1566 get_Bound_upper(pred) == upper &&
1567 get_irn_MacroBlock(bound) == get_irn_MacroBlock(pred)) {
1569 * One could expect that we simply return the previous
1570 * Bound here. However, this would be wrong, as we could
1571 * add an exception Proj to a new location then.
1572 * So, we must turn in into a tuple.
1578 /* Turn Bound into a tuple (mem, jmp, bad, idx) */
1579 switch (get_Proj_proj(proj)) {
1581 DBG_OPT_EXC_REM(proj);
1582 proj = get_Bound_mem(bound);
1584 case pn_Bound_X_except:
1585 DBG_OPT_EXC_REM(proj);
1586 proj = get_irg_bad(current_ir_graph);
1590 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
1593 /* cannot optimize pn_Bound_X_regular, handled in transform ... */
1598 } /* equivalent_node_Proj_Bound */
1601 * Optimize an Exception Proj(Load) with a non-null address.
1603 static ir_node *equivalent_node_Proj_Load(ir_node *proj) {
1604 if (get_opt_ldst_only_null_ptr_exceptions()) {
1605 if (get_irn_mode(proj) == mode_X) {
1606 ir_node *load = get_Proj_pred(proj);
1608 /* get the Load address */
1609 const ir_node *addr = get_Load_ptr(load);
1610 const ir_node *confirm;
1612 if (value_not_null(addr, &confirm)) {
1613 if (get_Proj_proj(proj) == pn_Load_X_except) {
1614 DBG_OPT_EXC_REM(proj);
1615 return get_irg_bad(current_ir_graph);
1621 } /* equivalent_node_Proj_Load */
1624 * Optimize an Exception Proj(Store) with a non-null address.
1626 static ir_node *equivalent_node_Proj_Store(ir_node *proj) {
1627 if (get_opt_ldst_only_null_ptr_exceptions()) {
1628 if (get_irn_mode(proj) == mode_X) {
1629 ir_node *store = get_Proj_pred(proj);
1631 /* get the load/store address */
1632 const ir_node *addr = get_Store_ptr(store);
1633 const ir_node *confirm;
1635 if (value_not_null(addr, &confirm)) {
1636 if (get_Proj_proj(proj) == pn_Store_X_except) {
1637 DBG_OPT_EXC_REM(proj);
1638 return get_irg_bad(current_ir_graph);
1644 } /* equivalent_node_Proj_Store */
1647 * Does all optimizations on nodes that must be done on it's Proj's
1648 * because of creating new nodes.
1650 static ir_node *equivalent_node_Proj(ir_node *proj) {
1651 ir_node *n = get_Proj_pred(proj);
1653 if (get_irn_mode(proj) == mode_X) {
1654 if (is_Block_dead(get_nodes_block(n))) {
1655 /* Remove dead control flow -- early gigo(). */
1656 return get_irg_bad(current_ir_graph);
1659 if (n->op->ops.equivalent_node_Proj)
1660 return n->op->ops.equivalent_node_Proj(proj);
1662 } /* equivalent_node_Proj */
1667 static ir_node *equivalent_node_Id(ir_node *n) {
1674 DBG_OPT_ID(oldn, n);
1676 } /* equivalent_node_Id */
1681 static ir_node *equivalent_node_Mux(ir_node *n)
1683 ir_node *oldn = n, *sel = get_Mux_sel(n);
1684 tarval *ts = value_of(sel);
1686 /* Mux(true, f, t) == t */
1687 if (ts == tarval_b_true) {
1688 n = get_Mux_true(n);
1689 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_C);
1691 /* Mux(false, f, t) == f */
1692 else if (ts == tarval_b_false) {
1693 n = get_Mux_false(n);
1694 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_C);
1696 /* Mux(v, x, x) == x */
1697 else if (get_Mux_false(n) == get_Mux_true(n)) {
1698 n = get_Mux_true(n);
1699 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_EQ);
1701 else if (is_Proj(sel) && !mode_honor_signed_zeros(get_irn_mode(n))) {
1702 ir_node *cmp = get_Proj_pred(sel);
1703 long proj_nr = get_Proj_proj(sel);
1704 ir_node *f = get_Mux_false(n);
1705 ir_node *t = get_Mux_true(n);
1708 * Note further that these optimization work even for floating point
1709 * with NaN's because -NaN == NaN.
1710 * However, if +0 and -0 is handled differently, we cannot use the first one.
1713 ir_node *const cmp_l = get_Cmp_left(cmp);
1714 ir_node *const cmp_r = get_Cmp_right(cmp);
1718 if ((cmp_l == t && cmp_r == f) || /* Mux(t == f, t, f) -> f */
1719 (cmp_l == f && cmp_r == t)) { /* Mux(f == t, t, f) -> f */
1721 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1728 if ((cmp_l == t && cmp_r == f) || /* Mux(t != f, t, f) -> t */
1729 (cmp_l == f && cmp_r == t)) { /* Mux(f != t, t, f) -> t */
1731 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1738 * Note: normalization puts the constant on the right side,
1739 * so we check only one case.
1741 if (cmp_l == t && tarval_is_null(value_of(cmp_r))) {
1742 /* Mux(t CMP 0, X, t) */
1743 if (is_Minus(f) && get_Minus_op(f) == t) {
1744 /* Mux(t CMP 0, -t, t) */
1745 if (proj_nr == pn_Cmp_Eq) {
1746 /* Mux(t == 0, -t, t) ==> -t */
1748 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1749 } else if (proj_nr == pn_Cmp_Lg || proj_nr == pn_Cmp_Ne) {
1750 /* Mux(t != 0, -t, t) ==> t */
1752 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_TRANSFORM);
1759 } /* equivalent_node_Mux */
1762 * Remove Confirm nodes if setting is on.
1763 * Replace Confirms(x, '=', Constlike) by Constlike.
1765 static ir_node *equivalent_node_Confirm(ir_node *n) {
1766 ir_node *pred = get_Confirm_value(n);
1767 pn_Cmp pnc = get_Confirm_cmp(n);
1769 while (is_Confirm(pred) && pnc == get_Confirm_cmp(pred)) {
1771 * rare case: two identical Confirms one after another,
1772 * replace the second one with the first.
1775 pred = get_Confirm_value(n);
1776 pnc = get_Confirm_cmp(n);
1778 if (get_opt_remove_confirm())
1779 return get_Confirm_value(n);
1784 * equivalent_node() returns a node equivalent to input n. It skips all nodes that
1785 * perform no actual computation, as, e.g., the Id nodes. It does not create
1786 * new nodes. It is therefore safe to free n if the node returned is not n.
1787 * If a node returns a Tuple we can not just skip it. If the size of the
1788 * in array fits, we transform n into a tuple (e.g., Div).
1790 ir_node *equivalent_node(ir_node *n) {
1791 if (n->op->ops.equivalent_node)
1792 return n->op->ops.equivalent_node(n);
1794 } /* equivalent_node */
1797 * Sets the default equivalent node operation for an ir_op_ops.
1799 * @param code the opcode for the default operation
1800 * @param ops the operations initialized
1805 static ir_op_ops *firm_set_default_equivalent_node(ir_opcode code, ir_op_ops *ops)
1809 ops->equivalent_node = equivalent_node_##a; \
1811 #define CASE_PROJ(a) \
1813 ops->equivalent_node_Proj = equivalent_node_Proj_##a; \
1855 } /* firm_set_default_equivalent_node */
1858 * Returns non-zero if a node is a Phi node
1859 * with all predecessors constant.
1861 static int is_const_Phi(ir_node *n) {
1864 if (! is_Phi(n) || get_irn_arity(n) == 0)
1866 for (i = get_irn_arity(n) - 1; i >= 0; --i)
1867 if (! is_Const(get_irn_n(n, i)))
1870 } /* is_const_Phi */
1872 typedef tarval *(*tarval_sub_type)(tarval *a, tarval *b, ir_mode *mode);
1873 typedef tarval *(*tarval_binop_type)(tarval *a, tarval *b);
1876 * Wrapper for the tarval binop evaluation, tarval_sub has one more parameter.
1878 static tarval *do_eval(tarval *(*eval)(), tarval *a, tarval *b, ir_mode *mode) {
1879 if (eval == tarval_sub) {
1880 tarval_sub_type func = (tarval_sub_type)eval;
1882 return func(a, b, mode);
1884 tarval_binop_type func = (tarval_binop_type)eval;
1891 * Apply an evaluator on a binop with a constant operators (and one Phi).
1893 * @param phi the Phi node
1894 * @param other the other operand
1895 * @param eval an evaluator function
1896 * @param mode the mode of the result, may be different from the mode of the Phi!
1897 * @param left if non-zero, other is the left operand, else the right
1899 * @return a new Phi node if the conversion was successful, NULL else
1901 static ir_node *apply_binop_on_phi(ir_node *phi, tarval *other, tarval *(*eval)(), ir_mode *mode, int left) {
1906 int i, n = get_irn_arity(phi);
1908 NEW_ARR_A(void *, res, n);
1910 for (i = 0; i < n; ++i) {
1911 pred = get_irn_n(phi, i);
1912 tv = get_Const_tarval(pred);
1913 tv = do_eval(eval, other, tv, mode);
1915 if (tv == tarval_bad) {
1916 /* folding failed, bad */
1922 for (i = 0; i < n; ++i) {
1923 pred = get_irn_n(phi, i);
1924 tv = get_Const_tarval(pred);
1925 tv = do_eval(eval, tv, other, mode);
1927 if (tv == tarval_bad) {
1928 /* folding failed, bad */
1934 irg = current_ir_graph;
1935 for (i = 0; i < n; ++i) {
1936 pred = get_irn_n(phi, i);
1937 res[i] = new_r_Const_type(irg, get_irg_start_block(irg),
1938 mode, res[i], get_Const_type(pred));
1940 return new_r_Phi(irg, get_nodes_block(phi), n, (ir_node **)res, mode);
1941 } /* apply_binop_on_phi */
1944 * Apply an evaluator on a binop with two constant Phi.
1946 * @param a the left Phi node
1947 * @param b the right Phi node
1948 * @param eval an evaluator function
1949 * @param mode the mode of the result, may be different from the mode of the Phi!
1951 * @return a new Phi node if the conversion was successful, NULL else
1953 static ir_node *apply_binop_on_2_phis(ir_node *a, ir_node *b, tarval *(*eval)(), ir_mode *mode) {
1954 tarval *tv_l, *tv_r, *tv;
1960 if (get_nodes_block(a) != get_nodes_block(b))
1963 n = get_irn_arity(a);
1964 NEW_ARR_A(void *, res, n);
1966 for (i = 0; i < n; ++i) {
1967 pred = get_irn_n(a, i);
1968 tv_l = get_Const_tarval(pred);
1969 pred = get_irn_n(b, i);
1970 tv_r = get_Const_tarval(pred);
1971 tv = do_eval(eval, tv_l, tv_r, mode);
1973 if (tv == tarval_bad) {
1974 /* folding failed, bad */
1979 irg = current_ir_graph;
1980 for (i = 0; i < n; ++i) {
1981 pred = get_irn_n(a, i);
1982 res[i] = new_r_Const_type(irg, get_irg_start_block(irg), mode, res[i], get_Const_type(pred));
1984 return new_r_Phi(irg, get_nodes_block(a), n, (ir_node **)res, mode);
1985 } /* apply_binop_on_2_phis */
1988 * Apply an evaluator on a unop with a constant operator (a Phi).
1990 * @param phi the Phi node
1991 * @param eval an evaluator function
1993 * @return a new Phi node if the conversion was successful, NULL else
1995 static ir_node *apply_unop_on_phi(ir_node *phi, tarval *(*eval)(tarval *)) {
2001 int i, n = get_irn_arity(phi);
2003 NEW_ARR_A(void *, res, n);
2004 for (i = 0; i < n; ++i) {
2005 pred = get_irn_n(phi, i);
2006 tv = get_Const_tarval(pred);
2009 if (tv == tarval_bad) {
2010 /* folding failed, bad */
2015 mode = get_irn_mode(phi);
2016 irg = current_ir_graph;
2017 for (i = 0; i < n; ++i) {
2018 pred = get_irn_n(phi, i);
2019 res[i] = new_r_Const_type(irg, get_irg_start_block(irg),
2020 mode, res[i], get_Const_type(pred));
2022 return new_r_Phi(irg, get_nodes_block(phi), n, (ir_node **)res, mode);
2023 } /* apply_unop_on_phi */
2026 * Apply a conversion on a constant operator (a Phi).
2028 * @param phi the Phi node
2030 * @return a new Phi node if the conversion was successful, NULL else
2032 static ir_node *apply_conv_on_phi(ir_node *phi, ir_mode *mode) {
2037 int i, n = get_irn_arity(phi);
2039 NEW_ARR_A(void *, res, n);
2040 for (i = 0; i < n; ++i) {
2041 pred = get_irn_n(phi, i);
2042 tv = get_Const_tarval(pred);
2043 tv = tarval_convert_to(tv, mode);
2045 if (tv == tarval_bad) {
2046 /* folding failed, bad */
2051 irg = current_ir_graph;
2052 for (i = 0; i < n; ++i) {
2053 pred = get_irn_n(phi, i);
2054 res[i] = new_r_Const_type(irg, get_irg_start_block(irg),
2055 mode, res[i], get_Const_type(pred));
2057 return new_r_Phi(irg, get_nodes_block(phi), n, (ir_node **)res, mode);
2058 } /* apply_conv_on_phi */
2061 * Transform AddP(P, ConvIs(Iu)), AddP(P, ConvIu(Is)) and
2062 * SubP(P, ConvIs(Iu)), SubP(P, ConvIu(Is)).
2063 * If possible, remove the Conv's.
2065 static ir_node *transform_node_AddSub(ir_node *n) {
2066 ir_mode *mode = get_irn_mode(n);
2068 if (mode_is_reference(mode)) {
2069 ir_node *left = get_binop_left(n);
2070 ir_node *right = get_binop_right(n);
2071 unsigned ref_bits = get_mode_size_bits(mode);
2073 if (is_Conv(left)) {
2074 ir_mode *lmode = get_irn_mode(left);
2075 unsigned bits = get_mode_size_bits(lmode);
2077 if (ref_bits == bits &&
2078 mode_is_int(lmode) &&
2079 get_mode_arithmetic(lmode) == irma_twos_complement) {
2080 ir_node *pre = get_Conv_op(left);
2081 ir_mode *pre_mode = get_irn_mode(pre);
2083 if (mode_is_int(pre_mode) &&
2084 get_mode_size_bits(pre_mode) == bits &&
2085 get_mode_arithmetic(pre_mode) == irma_twos_complement) {
2086 /* ok, this conv just changes to sign, moreover the calculation
2087 * is done with same number of bits as our address mode, so
2088 * we can ignore the conv as address calculation can be viewed
2089 * as either signed or unsigned
2091 set_binop_left(n, pre);
2096 if (is_Conv(right)) {
2097 ir_mode *rmode = get_irn_mode(right);
2098 unsigned bits = get_mode_size_bits(rmode);
2100 if (ref_bits == bits &&
2101 mode_is_int(rmode) &&
2102 get_mode_arithmetic(rmode) == irma_twos_complement) {
2103 ir_node *pre = get_Conv_op(right);
2104 ir_mode *pre_mode = get_irn_mode(pre);
2106 if (mode_is_int(pre_mode) &&
2107 get_mode_size_bits(pre_mode) == bits &&
2108 get_mode_arithmetic(pre_mode) == irma_twos_complement) {
2109 /* ok, this conv just changes to sign, moreover the calculation
2110 * is done with same number of bits as our address mode, so
2111 * we can ignore the conv as address calculation can be viewed
2112 * as either signed or unsigned
2114 set_binop_right(n, pre);
2119 /* let address arithmetic use unsigned modes */
2120 if (is_Const(right)) {
2121 ir_mode *rmode = get_irn_mode(right);
2123 if (mode_is_signed(rmode) && get_mode_arithmetic(rmode) == irma_twos_complement) {
2124 /* convert a AddP(P, *s) into AddP(P, *u) */
2125 ir_mode *nm = get_reference_mode_unsigned_eq(mode);
2127 ir_node *pre = new_r_Conv(current_ir_graph, get_nodes_block(n), right, nm);
2128 set_binop_right(n, pre);
2134 } /* transform_node_AddSub */
2136 #define HANDLE_BINOP_PHI(eval, a, b, c, mode) \
2138 if (is_Const(b) && is_const_Phi(a)) { \
2139 /* check for Op(Phi, Const) */ \
2140 c = apply_binop_on_phi(a, get_Const_tarval(b), eval, mode, 0);\
2142 else if (is_Const(a) && is_const_Phi(b)) { \
2143 /* check for Op(Const, Phi) */ \
2144 c = apply_binop_on_phi(b, get_Const_tarval(a), eval, mode, 1);\
2146 else if (is_const_Phi(a) && is_const_Phi(b)) { \
2147 /* check for Op(Phi, Phi) */ \
2148 c = apply_binop_on_2_phis(a, b, eval, mode); \
2151 DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI); \
2155 #define HANDLE_UNOP_PHI(eval, a, c) \
2157 if (is_const_Phi(a)) { \
2158 /* check for Op(Phi) */ \
2159 c = apply_unop_on_phi(a, eval); \
2161 DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI); \
2167 * Do the AddSub optimization, then Transform
2168 * Constant folding on Phi
2169 * Add(a,a) -> Mul(a, 2)
2170 * Add(Mul(a, x), a) -> Mul(a, x+1)
2171 * if the mode is integer or float.
2172 * Transform Add(a,-b) into Sub(a,b).
2173 * Reassociation might fold this further.
2175 static ir_node *transform_node_Add(ir_node *n) {
2177 ir_node *a, *b, *c, *oldn = n;
2179 n = transform_node_AddSub(n);
2181 a = get_Add_left(n);
2182 b = get_Add_right(n);
2184 mode = get_irn_mode(n);
2186 if (mode_is_reference(mode)) {
2187 ir_mode *lmode = get_irn_mode(a);
2189 if (is_Const(b) && is_Const_null(b) && mode_is_int(lmode)) {
2190 /* an Add(a, NULL) is a hidden Conv */
2191 dbg_info *dbg = get_irn_dbg_info(n);
2192 return new_rd_Conv(dbg, current_ir_graph, get_nodes_block(n), a, mode);
2196 HANDLE_BINOP_PHI(tarval_add, a, b, c, mode);
2198 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
2199 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
2202 if (mode_is_num(mode)) {
2203 /* the following code leads to endless recursion when Mul are replaced by a simple instruction chain */
2204 if (!is_arch_dep_running() && a == b && mode_is_int(mode)) {
2205 ir_node *block = get_nodes_block(n);
2208 get_irn_dbg_info(n),
2212 new_r_Const_long(current_ir_graph, block, mode, 2),
2214 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_A);
2219 get_irn_dbg_info(n),
2225 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
2230 get_irn_dbg_info(n),
2236 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_A_MINUS_B);
2239 if (get_mode_arithmetic(mode) == irma_twos_complement) {
2240 /* Here we rely on constants be on the RIGHT side */
2242 ir_node *op = get_Not_op(a);
2244 if (is_Const(b) && is_Const_one(b)) {
2246 ir_node *blk = get_nodes_block(n);
2247 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, op, mode);
2248 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_PLUS_1);
2253 ir_node *blk = get_nodes_block(n);
2254 n = new_r_Const(current_ir_graph, blk, mode, get_mode_minus_one(mode));
2255 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_X_NOT_X);
2260 ir_node *op = get_Not_op(b);
2264 ir_node *blk = get_nodes_block(n);
2265 n = new_r_Const(current_ir_graph, blk, mode, get_mode_minus_one(mode));
2266 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_X_NOT_X);
2273 } /* transform_node_Add */
2276 * returns -cnst or NULL if impossible
2278 static ir_node *const_negate(ir_node *cnst) {
2279 tarval *tv = tarval_neg(get_Const_tarval(cnst));
2280 dbg_info *dbgi = get_irn_dbg_info(cnst);
2281 ir_graph *irg = get_irn_irg(cnst);
2282 ir_node *block = get_nodes_block(cnst);
2283 ir_mode *mode = get_irn_mode(cnst);
2284 if (tv == tarval_bad) return NULL;
2285 return new_rd_Const(dbgi, irg, block, mode, tv);
2289 * Do the AddSub optimization, then Transform
2290 * Constant folding on Phi
2291 * Sub(0,a) -> Minus(a)
2292 * Sub(Mul(a, x), a) -> Mul(a, x-1)
2293 * Sub(Sub(x, y), b) -> Sub(x, Add(y,b))
2294 * Sub(Add(a, x), x) -> a
2295 * Sub(x, Add(x, a)) -> -a
2296 * Sub(x, Const) -> Add(x, -Const)
2298 static ir_node *transform_node_Sub(ir_node *n) {
2303 n = transform_node_AddSub(n);
2305 a = get_Sub_left(n);
2306 b = get_Sub_right(n);
2308 mode = get_irn_mode(n);
2310 if (mode_is_int(mode)) {
2311 ir_mode *lmode = get_irn_mode(a);
2313 if (is_Const(b) && is_Const_null(b) && mode_is_reference(lmode)) {
2314 /* a Sub(a, NULL) is a hidden Conv */
2315 dbg_info *dbg = get_irn_dbg_info(n);
2316 n = new_rd_Conv(dbg, current_ir_graph, get_nodes_block(n), a, mode);
2317 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_CONV);
2321 if (mode == lmode &&
2322 get_mode_arithmetic(mode) == irma_twos_complement &&
2324 get_Const_tarval(a) == get_mode_minus_one(mode)) {
2326 dbg_info *dbg = get_irn_dbg_info(n);
2327 n = new_rd_Not(dbg, current_ir_graph, get_nodes_block(n), b, mode);
2328 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_NOT);
2334 HANDLE_BINOP_PHI(tarval_sub, a, b, c, mode);
2336 /* for FP these optimizations are only allowed if fp_strict_algebraic is disabled */
2337 if (mode_is_float(mode) && (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic))
2340 if (is_Const(b) && get_irn_mode(b) != mode_P) {
2341 /* a - C -> a + (-C) */
2342 ir_node *cnst = const_negate(b);
2344 ir_node *block = get_nodes_block(n);
2345 dbg_info *dbgi = get_irn_dbg_info(n);
2346 ir_graph *irg = get_irn_irg(n);
2348 n = new_rd_Add(dbgi, irg, block, a, cnst, mode);
2349 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2354 if (is_Minus(a)) { /* (-a) - b -> -(a + b) */
2355 ir_graph *irg = current_ir_graph;
2356 dbg_info *dbg = get_irn_dbg_info(n);
2357 ir_node *block = get_nodes_block(n);
2358 ir_node *left = get_Minus_op(a);
2359 ir_node *add = new_rd_Add(dbg, irg, block, left, b, mode);
2361 n = new_rd_Minus(dbg, irg, block, add, mode);
2362 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2364 } else if (is_Minus(b)) { /* a - (-b) -> a + b */
2365 ir_graph *irg = current_ir_graph;
2366 dbg_info *dbg = get_irn_dbg_info(n);
2367 ir_node *block = get_nodes_block(n);
2368 ir_node *right = get_Minus_op(b);
2370 n = new_rd_Add(dbg, irg, block, a, right, mode);
2371 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MINUS);
2373 } else if (is_Sub(b)) {
2374 /* a - (b - c) -> a + (c - b)
2375 * -> (a - b) + c iff (b - c) is a pointer */
2376 ir_graph *irg = current_ir_graph;
2377 dbg_info *s_dbg = get_irn_dbg_info(b);
2378 ir_node *s_block = get_nodes_block(b);
2379 ir_node *s_left = get_Sub_left(b);
2380 ir_node *s_right = get_Sub_right(b);
2381 ir_mode *s_mode = get_irn_mode(b);
2382 if (s_mode == mode_P) {
2383 ir_node *sub = new_rd_Sub(s_dbg, irg, s_block, a, s_left, mode);
2384 dbg_info *a_dbg = get_irn_dbg_info(n);
2385 ir_node *a_block = get_nodes_block(n);
2388 s_right = new_r_Conv(irg, a_block, s_right, mode);
2389 n = new_rd_Add(a_dbg, irg, a_block, sub, s_right, mode);
2391 ir_node *sub = new_rd_Sub(s_dbg, irg, s_block, s_right, s_left, s_mode);
2392 dbg_info *a_dbg = get_irn_dbg_info(n);
2393 ir_node *a_block = get_nodes_block(n);
2395 n = new_rd_Add(a_dbg, irg, a_block, a, sub, mode);
2397 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2399 } else if (is_Mul(b)) { /* a - (b * C) -> a + (b * -C) */
2400 ir_node *m_right = get_Mul_right(b);
2401 if (is_Const(m_right)) {
2402 ir_node *cnst2 = const_negate(m_right);
2403 if (cnst2 != NULL) {
2404 ir_graph *irg = current_ir_graph;
2405 dbg_info *m_dbg = get_irn_dbg_info(b);
2406 ir_node *m_block = get_nodes_block(b);
2407 ir_node *m_left = get_Mul_left(b);
2408 ir_mode *m_mode = get_irn_mode(b);
2409 ir_node *mul = new_rd_Mul(m_dbg, irg, m_block, m_left, cnst2, m_mode);
2410 dbg_info *a_dbg = get_irn_dbg_info(n);
2411 ir_node *a_block = get_nodes_block(n);
2413 n = new_rd_Add(a_dbg, irg, a_block, a, mul, mode);
2414 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_TO_ADD);
2420 /* Beware of Sub(P, P) which cannot be optimized into a simple Minus ... */
2421 if (mode_is_num(mode) && mode == get_irn_mode(a) && is_Const(a) && is_Const_null(a)) {
2423 get_irn_dbg_info(n),
2428 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_0_A);
2432 if (mode_wrap_around(mode)) {
2433 ir_node *left = get_Add_left(a);
2434 ir_node *right = get_Add_right(a);
2436 /* FIXME: Does the Conv's work only for two complement or generally? */
2438 if (mode != get_irn_mode(right)) {
2439 /* This Sub is an effective Cast */
2440 right = new_r_Conv(get_irn_irg(n), get_nodes_block(n), right, mode);
2443 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2445 } else if (right == b) {
2446 if (mode != get_irn_mode(left)) {
2447 /* This Sub is an effective Cast */
2448 left = new_r_Conv(get_irn_irg(n), get_nodes_block(n), left, mode);
2451 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2457 if (mode_wrap_around(mode)) {
2458 ir_node *left = get_Add_left(b);
2459 ir_node *right = get_Add_right(b);
2461 /* FIXME: Does the Conv's work only for two complement or generally? */
2463 ir_mode *r_mode = get_irn_mode(right);
2465 n = new_r_Minus(get_irn_irg(n), get_nodes_block(n), right, r_mode);
2466 if (mode != r_mode) {
2467 /* This Sub is an effective Cast */
2468 n = new_r_Conv(get_irn_irg(n), get_nodes_block(n), n, mode);
2470 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2472 } else if (right == a) {
2473 ir_mode *l_mode = get_irn_mode(left);
2475 n = new_r_Minus(get_irn_irg(n), get_nodes_block(n), left, l_mode);
2476 if (mode != l_mode) {
2477 /* This Sub is an effective Cast */
2478 n = new_r_Conv(get_irn_irg(n), get_nodes_block(n), n, mode);
2480 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_SUB);
2485 if (mode_is_int(mode) && is_Conv(a) && is_Conv(b)) {
2486 ir_mode *mode = get_irn_mode(a);
2488 if (mode == get_irn_mode(b)) {
2490 ir_node *op_a = get_Conv_op(a);
2491 ir_node *op_b = get_Conv_op(b);
2493 /* check if it's allowed to skip the conv */
2494 ma = get_irn_mode(op_a);
2495 mb = get_irn_mode(op_b);
2497 if (mode_is_reference(ma) && mode_is_reference(mb)) {
2498 /* SubInt(ConvInt(aP), ConvInt(bP)) -> SubInt(aP,bP) */
2501 set_Sub_right(n, b);
2507 /* do NOT execute this code if reassociation is enabled, it does the inverse! */
2508 if (!is_reassoc_running() && is_Mul(a)) {
2509 ir_node *ma = get_Mul_left(a);
2510 ir_node *mb = get_Mul_right(a);
2513 ir_node *blk = get_nodes_block(n);
2515 get_irn_dbg_info(n),
2516 current_ir_graph, blk,
2519 get_irn_dbg_info(n),
2520 current_ir_graph, blk,
2522 new_r_Const_long(current_ir_graph, blk, mode, 1),
2525 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
2527 } else if (mb == b) {
2528 ir_node *blk = get_nodes_block(n);
2530 get_irn_dbg_info(n),
2531 current_ir_graph, blk,
2534 get_irn_dbg_info(n),
2535 current_ir_graph, blk,
2537 new_r_Const_long(current_ir_graph, blk, mode, 1),
2540 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_MUL_A_X_A);
2544 if (is_Sub(a)) { /* (x - y) - b -> x - (y + b) */
2545 ir_node *x = get_Sub_left(a);
2546 ir_node *y = get_Sub_right(a);
2547 ir_node *blk = get_nodes_block(n);
2548 ir_mode *m_b = get_irn_mode(b);
2549 ir_mode *m_y = get_irn_mode(y);
2553 /* Determine the right mode for the Add. */
2556 else if (mode_is_reference(m_b))
2558 else if (mode_is_reference(m_y))
2562 * Both modes are different but none is reference,
2563 * happens for instance in SubP(SubP(P, Iu), Is).
2564 * We have two possibilities here: Cast or ignore.
2565 * Currently we ignore this case.
2570 add = new_r_Add(current_ir_graph, blk, y, b, add_mode);
2572 n = new_rd_Sub(get_irn_dbg_info(n), current_ir_graph, blk, x, add, mode);
2573 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_SUB_X_Y_Z);
2577 if (get_mode_arithmetic(mode) == irma_twos_complement) {
2578 if (is_Const(a) && is_Not(b)) {
2579 /* c - ~X = X + (c+1) */
2580 tarval *tv = get_Const_tarval(a);
2582 tv = tarval_add(tv, get_mode_one(mode));
2583 if (tv != tarval_bad) {
2584 ir_node *blk = get_nodes_block(n);
2585 ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
2586 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, blk, get_Not_op(b), c, mode);
2587 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_SUB_C_NOT_X);
2593 } /* transform_node_Sub */
2596 * Several transformation done on n*n=2n bits mul.
2597 * These transformations must be done here because new nodes may be produced.
2599 static ir_node *transform_node_Mul2n(ir_node *n, ir_mode *mode) {
2601 ir_node *a = get_Mul_left(n);
2602 ir_node *b = get_Mul_right(n);
2603 tarval *ta = value_of(a);
2604 tarval *tb = value_of(b);
2605 ir_mode *smode = get_irn_mode(a);
2607 if (ta == get_mode_one(smode)) {
2608 /* (L)1 * (L)b = (L)b */
2609 ir_node *blk = get_nodes_block(n);
2610 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, b, mode);
2611 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
2614 else if (ta == get_mode_minus_one(smode)) {
2615 /* (L)-1 * (L)b = (L)b */
2616 ir_node *blk = get_nodes_block(n);
2617 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, b, smode);
2618 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, n, mode);
2619 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2622 if (tb == get_mode_one(smode)) {
2623 /* (L)a * (L)1 = (L)a */
2624 ir_node *blk = get_irn_n(a, -1);
2625 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, a, mode);
2626 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_NEUTRAL_1);
2629 else if (tb == get_mode_minus_one(smode)) {
2630 /* (L)a * (L)-1 = (L)-a */
2631 ir_node *blk = get_nodes_block(n);
2632 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, a, smode);
2633 n = new_rd_Conv(get_irn_dbg_info(n), current_ir_graph, blk, n, mode);
2634 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2641 * Transform Mul(a,-1) into -a.
2642 * Do constant evaluation of Phi nodes.
2643 * Do architecture dependent optimizations on Mul nodes
2645 static ir_node *transform_node_Mul(ir_node *n) {
2646 ir_node *c, *oldn = n;
2647 ir_mode *mode = get_irn_mode(n);
2648 ir_node *a = get_Mul_left(n);
2649 ir_node *b = get_Mul_right(n);
2651 if (is_Bad(a) || is_Bad(b))
2654 if (mode != get_irn_mode(a))
2655 return transform_node_Mul2n(n, mode);
2657 HANDLE_BINOP_PHI(tarval_mul, a, b, c, mode);
2659 if (mode_is_signed(mode)) {
2662 if (value_of(a) == get_mode_minus_one(mode))
2664 else if (value_of(b) == get_mode_minus_one(mode))
2667 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), r, mode);
2668 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2673 if (is_Const(b)) { /* (-a) * const -> a * -const */
2674 ir_node *cnst = const_negate(b);
2676 dbg_info *dbgi = get_irn_dbg_info(n);
2677 ir_node *block = get_nodes_block(n);
2678 n = new_rd_Mul(dbgi, current_ir_graph, block, get_Minus_op(a), cnst, mode);
2679 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_1);
2682 } else if (is_Minus(b)) { /* (-a) * (-b) -> a * b */
2683 dbg_info *dbgi = get_irn_dbg_info(n);
2684 ir_node *block = get_nodes_block(n);
2685 n = new_rd_Mul(dbgi, current_ir_graph, block, get_Minus_op(a), get_Minus_op(b), mode);
2686 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS_MINUS);
2688 } else if (is_Sub(b)) { /* (-a) * (b - c) -> a * (c - b) */
2689 ir_node *sub_l = get_Sub_left(b);
2690 ir_node *sub_r = get_Sub_right(b);
2691 dbg_info *dbgi = get_irn_dbg_info(n);
2692 ir_graph *irg = current_ir_graph;
2693 ir_node *block = get_nodes_block(n);
2694 ir_node *new_b = new_rd_Sub(dbgi, irg, block, sub_r, sub_l, mode);
2695 n = new_rd_Mul(dbgi, irg, block, get_Minus_op(a), new_b, mode);
2696 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS);
2699 } else if (is_Minus(b)) {
2700 if (is_Sub(a)) { /* (a - b) * (-c) -> (b - a) * c */
2701 ir_node *sub_l = get_Sub_left(a);
2702 ir_node *sub_r = get_Sub_right(a);
2703 dbg_info *dbgi = get_irn_dbg_info(n);
2704 ir_graph *irg = current_ir_graph;
2705 ir_node *block = get_nodes_block(n);
2706 ir_node *new_a = new_rd_Sub(dbgi, irg, block, sub_r, sub_l, mode);
2707 n = new_rd_Mul(dbgi, irg, block, new_a, get_Minus_op(b), mode);
2708 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_MUL_MINUS);
2712 if (get_mode_arithmetic(mode) == irma_ieee754) {
2714 tarval *tv = get_Const_tarval(a);
2715 if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)
2716 && !tarval_is_negative(tv)) {
2717 /* 2.0 * b = b + b */
2718 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), b, b, mode);
2719 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
2723 else if (is_Const(b)) {
2724 tarval *tv = get_Const_tarval(b);
2725 if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)
2726 && !tarval_is_negative(tv)) {
2727 /* a * 2.0 = a + a */
2728 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), a, a, mode);
2729 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
2734 return arch_dep_replace_mul_with_shifts(n);
2735 } /* transform_node_Mul */
2738 * Transform a Div Node.
2740 static ir_node *transform_node_Div(ir_node *n) {
2741 ir_mode *mode = get_Div_resmode(n);
2742 ir_node *a = get_Div_left(n);
2743 ir_node *b = get_Div_right(n);
2747 if (is_Const(b) && is_const_Phi(a)) {
2748 /* check for Div(Phi, Const) */
2749 value = apply_binop_on_phi(a, get_Const_tarval(b), tarval_div, mode, 0);
2751 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2755 else if (is_Const(a) && is_const_Phi(b)) {
2756 /* check for Div(Const, Phi) */
2757 value = apply_binop_on_phi(b, get_Const_tarval(a), tarval_div, mode, 1);
2759 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2763 else if (is_const_Phi(a) && is_const_Phi(b)) {
2764 /* check for Div(Phi, Phi) */
2765 value = apply_binop_on_2_phis(a, b, tarval_div, mode);
2767 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2774 if (tv != tarval_bad) {
2775 value = new_Const(get_tarval_mode(tv), tv);
2777 DBG_OPT_CSTEVAL(n, value);
2780 ir_node *a = get_Div_left(n);
2781 ir_node *b = get_Div_right(n);
2782 const ir_node *dummy;
2784 if (a == b && value_not_zero(a, &dummy)) {
2785 /* BEWARE: we can optimize a/a to 1 only if this cannot cause a exception */
2786 value = new_Const(mode, get_mode_one(mode));
2787 DBG_OPT_CSTEVAL(n, value);
2790 if (mode_is_signed(mode) && is_Const(b)) {
2791 tarval *tv = get_Const_tarval(b);
2793 if (tv == get_mode_minus_one(mode)) {
2795 value = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), a, mode);
2796 DBG_OPT_CSTEVAL(n, value);
2800 /* Try architecture dependent optimization */
2801 value = arch_dep_replace_div_by_const(n);
2809 /* Turn Div into a tuple (mem, jmp, bad, value) */
2810 mem = get_Div_mem(n);
2811 blk = get_nodes_block(n);
2813 /* skip a potential Pin */
2814 mem = skip_Pin(mem);
2815 turn_into_tuple(n, pn_Div_max);
2816 set_Tuple_pred(n, pn_Div_M, mem);
2817 set_Tuple_pred(n, pn_Div_X_regular, new_r_Jmp(current_ir_graph, blk));
2818 set_Tuple_pred(n, pn_Div_X_except, new_Bad());
2819 set_Tuple_pred(n, pn_Div_res, value);
2822 } /* transform_node_Div */
2825 * Transform a Mod node.
2827 static ir_node *transform_node_Mod(ir_node *n) {
2828 ir_mode *mode = get_Mod_resmode(n);
2829 ir_node *a = get_Mod_left(n);
2830 ir_node *b = get_Mod_right(n);
2834 if (is_Const(b) && is_const_Phi(a)) {
2835 /* check for Div(Phi, Const) */
2836 value = apply_binop_on_phi(a, get_Const_tarval(b), tarval_mod, mode, 0);
2838 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2842 else if (is_Const(a) && is_const_Phi(b)) {
2843 /* check for Div(Const, Phi) */
2844 value = apply_binop_on_phi(b, get_Const_tarval(a), tarval_mod, mode, 1);
2846 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2850 else if (is_const_Phi(a) && is_const_Phi(b)) {
2851 /* check for Div(Phi, Phi) */
2852 value = apply_binop_on_2_phis(a, b, tarval_mod, mode);
2854 DBG_OPT_ALGSIM0(n, value, FS_OPT_CONST_PHI);
2861 if (tv != tarval_bad) {
2862 value = new_Const(get_tarval_mode(tv), tv);
2864 DBG_OPT_CSTEVAL(n, value);
2867 ir_node *a = get_Mod_left(n);
2868 ir_node *b = get_Mod_right(n);
2869 const ir_node *dummy;
2871 if (a == b && value_not_zero(a, &dummy)) {
2872 /* BEWARE: we can optimize a%a to 0 only if this cannot cause a exception */
2873 value = new_Const(mode, get_mode_null(mode));
2874 DBG_OPT_CSTEVAL(n, value);
2877 if (mode_is_signed(mode) && is_Const(b)) {
2878 tarval *tv = get_Const_tarval(b);
2880 if (tv == get_mode_minus_one(mode)) {
2882 value = new_Const(mode, get_mode_null(mode));
2883 DBG_OPT_CSTEVAL(n, value);
2887 /* Try architecture dependent optimization */
2888 value = arch_dep_replace_mod_by_const(n);
2896 /* Turn Mod into a tuple (mem, jmp, bad, value) */
2897 mem = get_Mod_mem(n);
2898 blk = get_nodes_block(n);
2900 /* skip a potential Pin */
2901 mem = skip_Pin(mem);
2902 turn_into_tuple(n, pn_Mod_max);
2903 set_Tuple_pred(n, pn_Mod_M, mem);
2904 set_Tuple_pred(n, pn_Mod_X_regular, new_r_Jmp(current_ir_graph, blk));
2905 set_Tuple_pred(n, pn_Mod_X_except, new_Bad());
2906 set_Tuple_pred(n, pn_Mod_res, value);
2909 } /* transform_node_Mod */
2912 * Transform a DivMod node.
2914 static ir_node *transform_node_DivMod(ir_node *n) {
2915 const ir_node *dummy;
2916 ir_node *a = get_DivMod_left(n);
2917 ir_node *b = get_DivMod_right(n);
2918 ir_mode *mode = get_DivMod_resmode(n);
2923 if (is_Const(b) && is_const_Phi(a)) {
2924 /* check for Div(Phi, Const) */
2925 va = apply_binop_on_phi(a, get_Const_tarval(b), tarval_div, mode, 0);
2926 vb = apply_binop_on_phi(a, get_Const_tarval(b), tarval_mod, mode, 0);
2928 DBG_OPT_ALGSIM0(n, va, FS_OPT_CONST_PHI);
2929 DBG_OPT_ALGSIM0(n, vb, FS_OPT_CONST_PHI);
2933 else if (is_Const(a) && is_const_Phi(b)) {
2934 /* check for Div(Const, Phi) */
2935 va = apply_binop_on_phi(b, get_Const_tarval(a), tarval_div, mode, 1);
2936 vb = apply_binop_on_phi(b, get_Const_tarval(a), tarval_mod, mode, 1);
2938 DBG_OPT_ALGSIM0(n, va, FS_OPT_CONST_PHI);
2939 DBG_OPT_ALGSIM0(n, vb, FS_OPT_CONST_PHI);
2943 else if (is_const_Phi(a) && is_const_Phi(b)) {
2944 /* check for Div(Phi, Phi) */
2945 va = apply_binop_on_2_phis(a, b, tarval_div, mode);
2946 vb = apply_binop_on_2_phis(a, b, tarval_mod, mode);
2948 DBG_OPT_ALGSIM0(n, va, FS_OPT_CONST_PHI);
2949 DBG_OPT_ALGSIM0(n, vb, FS_OPT_CONST_PHI);
2956 if (tb != tarval_bad) {
2957 if (tb == get_mode_one(get_tarval_mode(tb))) {
2959 vb = new_Const(mode, get_mode_null(mode));
2960 DBG_OPT_CSTEVAL(n, vb);
2962 } else if (ta != tarval_bad) {
2963 tarval *resa, *resb;
2964 resa = tarval_div(ta, tb);
2965 if (resa == tarval_bad) return n; /* Causes exception!!! Model by replacing through
2966 Jmp for X result!? */
2967 resb = tarval_mod(ta, tb);
2968 if (resb == tarval_bad) return n; /* Causes exception! */
2969 va = new_Const(mode, resa);
2970 vb = new_Const(mode, resb);
2971 DBG_OPT_CSTEVAL(n, va);
2972 DBG_OPT_CSTEVAL(n, vb);
2974 } else if (mode_is_signed(mode) && tb == get_mode_minus_one(mode)) {
2975 va = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), a, mode);
2976 vb = new_Const(mode, get_mode_null(mode));
2977 DBG_OPT_CSTEVAL(n, va);
2978 DBG_OPT_CSTEVAL(n, vb);
2980 } else { /* Try architecture dependent optimization */
2983 arch_dep_replace_divmod_by_const(&va, &vb, n);
2984 evaluated = va != NULL;
2986 } else if (a == b) {
2987 if (value_not_zero(a, &dummy)) {
2989 va = new_Const(mode, get_mode_one(mode));
2990 vb = new_Const(mode, get_mode_null(mode));
2991 DBG_OPT_CSTEVAL(n, va);
2992 DBG_OPT_CSTEVAL(n, vb);
2995 /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
2998 } else if (ta == get_mode_null(mode) && value_not_zero(b, &dummy)) {
2999 /* 0 / non-Const = 0 */
3004 if (evaluated) { /* replace by tuple */
3008 mem = get_DivMod_mem(n);
3009 /* skip a potential Pin */
3010 mem = skip_Pin(mem);
3012 blk = get_nodes_block(n);
3013 turn_into_tuple(n, pn_DivMod_max);
3014 set_Tuple_pred(n, pn_DivMod_M, mem);
3015 set_Tuple_pred(n, pn_DivMod_X_regular, new_r_Jmp(current_ir_graph, blk));
3016 set_Tuple_pred(n, pn_DivMod_X_except, new_Bad()); /* no exception */
3017 set_Tuple_pred(n, pn_DivMod_res_div, va);
3018 set_Tuple_pred(n, pn_DivMod_res_mod, vb);
3022 } /* transform_node_DivMod */
3025 * Optimize x / c to x * (1/c)
3027 static ir_node *transform_node_Quot(ir_node *n) {
3028 ir_mode *mode = get_Quot_resmode(n);
3031 if (get_mode_arithmetic(mode) == irma_ieee754) {
3032 ir_node *b = get_Quot_right(n);
3033 tarval *tv = value_of(b);
3035 if (tv != tarval_bad) {
3039 * Floating point constant folding might be disabled here to
3041 * However, as we check for exact result, doing it is safe.
3044 rem = tarval_enable_fp_ops(1);
3045 tv = tarval_quo(get_mode_one(mode), tv);
3046 (void)tarval_enable_fp_ops(rem);
3048 /* Do the transformation if the result is either exact or we are not
3049 using strict rules. */
3050 if (tv != tarval_bad &&
3051 (tarval_ieee754_get_exact() || (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic) == 0)) {
3052 ir_node *blk = get_nodes_block(n);
3053 ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
3054 ir_node *a = get_Quot_left(n);
3055 ir_node *m = new_rd_Mul(get_irn_dbg_info(n), current_ir_graph, blk, a, c, mode);
3056 ir_node *mem = get_Quot_mem(n);
3058 /* skip a potential Pin */
3059 mem = skip_Pin(mem);
3060 turn_into_tuple(n, pn_Quot_max);
3061 set_Tuple_pred(n, pn_Quot_M, mem);
3062 set_Tuple_pred(n, pn_Quot_X_regular, new_r_Jmp(current_ir_graph, blk));
3063 set_Tuple_pred(n, pn_Quot_X_except, new_r_Bad(current_ir_graph));
3064 set_Tuple_pred(n, pn_Quot_res, m);
3065 DBG_OPT_ALGSIM1(oldn, a, b, m, FS_OPT_FP_INV_MUL);
3070 } /* transform_node_Quot */
3073 * Optimize Abs(x) into x if x is Confirmed >= 0
3074 * Optimize Abs(x) into -x if x is Confirmed <= 0
3075 * Optimize Abs(-x) int Abs(x)
3077 static ir_node *transform_node_Abs(ir_node *n) {
3078 ir_node *c, *oldn = n;
3079 ir_node *a = get_Abs_op(n);
3082 HANDLE_UNOP_PHI(tarval_abs, a, c);
3084 switch (classify_value_sign(a)) {
3085 case value_classified_negative:
3086 mode = get_irn_mode(n);
3089 * We can replace the Abs by -x here.
3090 * We even could add a new Confirm here
3091 * (if not twos complement)
3093 * Note that -x would create a new node, so we could
3094 * not run it in the equivalent_node() context.
3096 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph,
3097 get_nodes_block(n), a, mode);
3099 DBG_OPT_CONFIRM(oldn, n);
3101 case value_classified_positive:
3102 /* n is positive, Abs is not needed */
3105 DBG_OPT_CONFIRM(oldn, n);
3111 /* Abs(-x) = Abs(x) */
3112 mode = get_irn_mode(n);
3113 n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph,
3114 get_nodes_block(n), get_Minus_op(a), mode);
3115 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ABS_MINUS_X);
3119 } /* transform_node_Abs */
3122 * Optimize -a CMP -b into b CMP a.
3123 * This works only for for modes where unary Minus
3125 * Note that two-complement integers can Overflow
3126 * so it will NOT work.
3128 * For == and != can be handled in Proj(Cmp)
3130 static ir_node *transform_node_Cmp(ir_node *n) {
3132 ir_node *left = get_Cmp_left(n);
3133 ir_node *right = get_Cmp_right(n);
3135 if (is_Minus(left) && is_Minus(right) &&
3136 !mode_overflow_on_unary_Minus(get_irn_mode(left))) {
3137 ir_node *const new_left = get_Minus_op(right);
3138 ir_node *const new_right = get_Minus_op(left);
3139 n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph,
3140 get_nodes_block(n), new_left, new_right);
3141 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CMP_OP_OP);
3144 } /* transform_node_Cmp */
3148 * Transform a Cond node.
3150 * Replace the Cond by a Jmp if it branches on a constant
3153 static ir_node *transform_node_Cond(ir_node *n) {
3156 ir_node *a = get_Cond_selector(n);
3157 tarval *ta = value_of(a);
3159 /* we need block info which is not available in floating irgs */
3160 if (get_irg_pinned(current_ir_graph) == op_pin_state_floats)
3163 if ((ta != tarval_bad) &&
3164 (get_irn_mode(a) == mode_b) &&
3165 (get_opt_unreachable_code())) {
3166 /* It's a boolean Cond, branching on a boolean constant.
3167 Replace it by a tuple (Bad, Jmp) or (Jmp, Bad) */
3168 ir_node *blk = get_nodes_block(n);
3169 jmp = new_r_Jmp(current_ir_graph, blk);
3170 turn_into_tuple(n, pn_Cond_max);
3171 if (ta == tarval_b_true) {
3172 set_Tuple_pred(n, pn_Cond_false, new_Bad());
3173 set_Tuple_pred(n, pn_Cond_true, jmp);
3175 set_Tuple_pred(n, pn_Cond_false, jmp);
3176 set_Tuple_pred(n, pn_Cond_true, new_Bad());
3178 /* We might generate an endless loop, so keep it alive. */
3179 add_End_keepalive(get_irg_end(current_ir_graph), blk);
3182 } /* transform_node_Cond */
3185 * Prototype of a recursive transform function
3186 * for bitwise distributive transformations.
3188 typedef ir_node* (*recursive_transform)(ir_node *n);
3191 * makes use of distributive laws for and, or, eor
3192 * and(a OP c, b OP c) -> and(a, b) OP c
3193 * note, might return a different op than n
3195 static ir_node *transform_bitwise_distributive(ir_node *n,
3196 recursive_transform trans_func)
3199 ir_node *a = get_binop_left(n);
3200 ir_node *b = get_binop_right(n);
3201 ir_op *op = get_irn_op(a);
3202 ir_op *op_root = get_irn_op(n);
3204 if(op != get_irn_op(b))
3207 if (op == op_Conv) {
3208 ir_node *a_op = get_Conv_op(a);
3209 ir_node *b_op = get_Conv_op(b);
3210 ir_mode *a_mode = get_irn_mode(a_op);
3211 ir_mode *b_mode = get_irn_mode(b_op);
3212 if(a_mode == b_mode && (mode_is_int(a_mode) || a_mode == mode_b)) {
3213 ir_node *blk = get_nodes_block(n);
3216 set_binop_left(n, a_op);
3217 set_binop_right(n, b_op);
3218 set_irn_mode(n, a_mode);
3220 n = new_r_Conv(current_ir_graph, blk, n, get_irn_mode(oldn));
3222 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_SHIFT_AND);
3228 /* nothing to gain here */
3232 if (op == op_Shrs || op == op_Shr || op == op_Shl
3233 || op == op_And || op == op_Or || op == op_Eor) {
3234 ir_node *a_left = get_binop_left(a);
3235 ir_node *a_right = get_binop_right(a);
3236 ir_node *b_left = get_binop_left(b);
3237 ir_node *b_right = get_binop_right(b);
3239 ir_node *op1 = NULL;
3240 ir_node *op2 = NULL;
3242 if (is_op_commutative(op)) {
3243 if (a_left == b_left) {
3247 } else if(a_left == b_right) {
3251 } else if(a_right == b_left) {
3257 if(a_right == b_right) {
3264 /* (a sop c) & (b sop c) => (a & b) sop c */
3265 ir_node *blk = get_nodes_block(n);
3267 ir_node *new_n = exact_copy(n);
3268 set_binop_left(new_n, op1);
3269 set_binop_right(new_n, op2);
3270 new_n = trans_func(new_n);
3272 if(op_root == op_Eor && op == op_Or) {
3273 dbg_info *dbgi = get_irn_dbg_info(n);
3274 ir_graph *irg = current_ir_graph;
3275 ir_mode *mode = get_irn_mode(c);
3277 c = new_rd_Not(dbgi, irg, blk, c, mode);
3278 n = new_rd_And(dbgi, irg, blk, new_n, c, mode);
3281 set_nodes_block(n, blk);
3282 set_binop_left(n, new_n);
3283 set_binop_right(n, c);
3284 add_identities(current_ir_graph->value_table, n);
3287 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_SHIFT_AND);
3298 static ir_node *transform_node_And(ir_node *n) {
3299 ir_node *c, *oldn = n;
3300 ir_node *a = get_And_left(n);
3301 ir_node *b = get_And_right(n);
3304 mode = get_irn_mode(n);
3305 HANDLE_BINOP_PHI(tarval_and, a, b, c, mode);
3307 /* we can evaluate 2 Projs of the same Cmp */
3308 if (mode == mode_b && is_Proj(a) && is_Proj(b)) {
3309 ir_node *pred_a = get_Proj_pred(a);
3310 ir_node *pred_b = get_Proj_pred(b);
3311 if (pred_a == pred_b) {
3312 dbg_info *dbgi = get_irn_dbg_info(n);
3313 ir_node *block = get_nodes_block(pred_a);
3314 pn_Cmp pn_a = get_Proj_proj(a);
3315 pn_Cmp pn_b = get_Proj_proj(b);
3316 /* yes, we can simply calculate with pncs */
3317 pn_Cmp new_pnc = pn_a & pn_b;
3319 return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b, new_pnc);
3324 ir_node *op = get_Not_op(b);
3326 ir_node *ba = get_And_left(op);
3327 ir_node *bb = get_And_right(op);
3329 /* it's enough to test the following cases due to normalization! */
3330 if (get_Or_left(a) == ba && get_Or_right(a) == bb) {
3331 /* (a|b) & ~(a&b) = a^b */
3332 ir_node *block = get_nodes_block(n);
3334 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph, block, ba, bb, mode);
3335 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_TO_EOR);
3343 ir_node *op = get_Not_op(a);
3345 ir_node *aa = get_And_left(op);
3346 ir_node *ab = get_And_right(op);
3348 /* it's enough to test the following cases due to normalization! */
3349 if (get_Or_left(b) == aa && get_Or_right(b) == ab) {
3350 /* (a|b) & ~(a&b) = a^b */
3351 ir_node *block = get_nodes_block(n);
3353 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph, block, aa, ab, mode);
3354 DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_TO_EOR);
3361 ir_node *al = get_Eor_left(a);
3362 ir_node *ar = get_Eor_right(a);
3365 /* (b ^ a) & b -> ~a & b */
3366 dbg_info *dbg = get_irn_dbg_info(n);
3367 ir_node *block = get_nodes_block(n);
3369 ar = new_rd_Not(dbg, current_ir_graph, block, ar, mode);
3370 n = new_rd_And(dbg, current_ir_graph, block, ar, b, mode);
3371 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3375 /* (a ^ b) & b -> ~a & b */
3376 dbg_info *dbg = get_irn_dbg_info(n);
3377 ir_node *block = get_nodes_block(n);
3379 al = new_rd_Not(dbg, current_ir_graph, block, al, mode);
3380 n = new_rd_And(dbg, current_ir_graph, block, al, b, mode);
3381 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3386 ir_node *bl = get_Eor_left(b);
3387 ir_node *br = get_Eor_right(b);
3390 /* a & (a ^ b) -> a & ~b */
3391 dbg_info *dbg = get_irn_dbg_info(n);
3392 ir_node *block = get_nodes_block(n);
3394 br = new_rd_Not(dbg, current_ir_graph, block, br, mode);
3395 n = new_rd_And(dbg, current_ir_graph, block, br, a, mode);
3396 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3400 /* a & (b ^ a) -> a & ~b */
3401 dbg_info *dbg = get_irn_dbg_info(n);
3402 ir_node *block = get_nodes_block(n);
3404 bl = new_rd_Not(dbg, current_ir_graph, block, bl, mode);
3405 n = new_rd_And(dbg, current_ir_graph, block, bl, a, mode);
3406 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3410 if (is_Not(a) && is_Not(b)) {
3411 /* ~a & ~b = ~(a|b) */
3412 ir_node *block = get_nodes_block(n);
3413 ir_mode *mode = get_irn_mode(n);
3417 n = new_rd_Or(get_irn_dbg_info(n), current_ir_graph, block, a, b, mode);
3418 n = new_rd_Not(get_irn_dbg_info(n), current_ir_graph, block, n, mode);
3419 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_DEMORGAN);
3423 n = transform_bitwise_distributive(n, transform_node_And);
3426 } /* transform_node_And */
3431 static ir_node *transform_node_Eor(ir_node *n) {
3432 ir_node *c, *oldn = n;
3433 ir_node *a = get_Eor_left(n);
3434 ir_node *b = get_Eor_right(n);
3435 ir_mode *mode = get_irn_mode(n);
3437 HANDLE_BINOP_PHI(tarval_eor, a, b, c, mode);
3439 /* we can evaluate 2 Projs of the same Cmp */
3440 if (mode == mode_b && is_Proj(a) && is_Proj(b)) {
3441 ir_node *pred_a = get_Proj_pred(a);
3442 ir_node *pred_b = get_Proj_pred(b);
3443 if(pred_a == pred_b) {
3444 dbg_info *dbgi = get_irn_dbg_info(n);
3445 ir_node *block = get_nodes_block(pred_a);
3446 pn_Cmp pn_a = get_Proj_proj(a);
3447 pn_Cmp pn_b = get_Proj_proj(b);
3448 /* yes, we can simply calculate with pncs */
3449 pn_Cmp new_pnc = pn_a ^ pn_b;
3451 return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
3458 n = new_rd_Const(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n),
3459 mode, get_mode_null(mode));
3460 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_A_A);
3461 } else if (mode == mode_b &&
3463 is_Const(b) && is_Const_one(b) &&
3464 is_Cmp(get_Proj_pred(a))) {
3465 /* The Eor negates a Cmp. The Cmp has the negated result anyways! */
3466 n = new_r_Proj(current_ir_graph, get_nodes_block(n), get_Proj_pred(a),
3467 mode_b, get_negated_pnc(get_Proj_proj(a), mode));
3469 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT_BOOL);
3470 } else if (is_Const(b)) {
3471 if (is_Not(a)) { /* ~x ^ const -> x ^ ~const */
3472 ir_node *cnst = new_Const(mode, tarval_not(get_Const_tarval(b)));
3473 ir_node *not_op = get_Not_op(a);
3474 dbg_info *dbg = get_irn_dbg_info(n);
3475 ir_graph *irg = current_ir_graph;
3476 ir_node *block = get_nodes_block(n);
3477 ir_mode *mode = get_irn_mode(n);
3478 n = new_rd_Eor(dbg, irg, block, not_op, cnst, mode);
3480 } else if (is_Const_all_one(b)) { /* x ^ 1...1 -> ~1 */
3481 n = new_r_Not(current_ir_graph, get_nodes_block(n), a, mode);
3482 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_EOR_TO_NOT);
3485 n = transform_bitwise_distributive(n, transform_node_Eor);
3489 } /* transform_node_Eor */
3494 static ir_node *transform_node_Not(ir_node *n) {
3495 ir_node *c, *oldn = n;
3496 ir_node *a = get_Not_op(n);
3497 ir_mode *mode = get_irn_mode(n);
3499 HANDLE_UNOP_PHI(tarval_not,a,c);
3501 /* check for a boolean Not */
3502 if (mode == mode_b &&
3504 is_Cmp(get_Proj_pred(a))) {
3505 /* We negate a Cmp. The Cmp has the negated result anyways! */
3506 n = new_r_Proj(current_ir_graph, get_nodes_block(n), get_Proj_pred(a),
3507 mode_b, get_negated_pnc(get_Proj_proj(a), mode_b));
3508 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_CMP);
3512 ir_node *eor_b = get_Eor_right(a);
3513 if (is_Const(eor_b)) { /* ~(x ^ const) -> x ^ ~const */
3514 ir_node *cnst = new_Const(mode, tarval_not(get_Const_tarval(eor_b)));
3515 ir_node *eor_a = get_Eor_left(a);
3516 dbg_info *dbg = get_irn_dbg_info(n);
3517 ir_graph *irg = current_ir_graph;
3518 ir_node *block = get_nodes_block(n);
3519 ir_mode *mode = get_irn_mode(n);
3520 n = new_rd_Eor(dbg, irg, block, eor_a, cnst, mode);
3524 if (get_mode_arithmetic(mode) == irma_twos_complement) {
3525 if (is_Minus(a)) { /* ~-x -> x + -1 */
3526 dbg_info *dbg = get_irn_dbg_info(n);
3527 ir_graph *irg = current_ir_graph;
3528 ir_node *block = get_nodes_block(n);
3529 ir_node *add_l = get_Minus_op(a);
3530 ir_node *add_r = new_rd_Const(dbg, irg, block, mode, get_mode_minus_one(mode));
3531 n = new_rd_Add(dbg, irg, block, add_l, add_r, mode);
3532 } else if (is_Add(a)) {
3533 ir_node *add_r = get_Add_right(a);
3534 if (is_Const(add_r) && is_Const_all_one(add_r)) {
3535 /* ~(x + -1) = -x */
3536 ir_node *op = get_Add_left(a);
3537 ir_node *blk = get_nodes_block(n);
3538 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, op, get_irn_mode(n));
3539 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_MINUS_1);
3544 } /* transform_node_Not */
3547 * Transform a Minus.
3551 * -(a >>u (size-1)) = a >>s (size-1)
3552 * -(a >>s (size-1)) = a >>u (size-1)
3553 * -(a * const) -> a * -const
3555 static ir_node *transform_node_Minus(ir_node *n) {
3556 ir_node *c, *oldn = n;
3557 ir_node *a = get_Minus_op(n);
3560 HANDLE_UNOP_PHI(tarval_neg,a,c);
3562 mode = get_irn_mode(a);
3563 if (get_mode_arithmetic(mode) == irma_twos_complement) {
3564 /* the following rules are only to twos-complement */
3567 ir_node *op = get_Not_op(a);
3568 tarval *tv = get_mode_one(mode);
3569 ir_node *blk = get_nodes_block(n);
3570 ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
3571 n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, blk, op, c, mode);
3572 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_NOT);
3576 ir_node *c = get_Shr_right(a);
3579 tarval *tv = get_Const_tarval(c);
3581 if (tarval_is_long(tv) && get_tarval_long(tv) == (int) get_mode_size_bits(mode) - 1) {
3582 /* -(a >>u (size-1)) = a >>s (size-1) */
3583 ir_node *v = get_Shr_left(a);
3585 n = new_rd_Shrs(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), v, c, mode);
3586 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_PREDICATE);
3592 ir_node *c = get_Shrs_right(a);
3595 tarval *tv = get_Const_tarval(c);
3597 if (tarval_is_long(tv) && get_tarval_long(tv) == (int) get_mode_size_bits(mode) - 1) {
3598 /* -(a >>s (size-1)) = a >>u (size-1) */
3599 ir_node *v = get_Shrs_left(a);
3601 n = new_rd_Shr(get_irn_dbg_info(n), current_ir_graph, get_nodes_block(n), v, c, mode);
3602 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_PREDICATE);
3609 /* - (a-b) = b - a */
3610 ir_node *la = get_Sub_left(a);
3611 ir_node *ra = get_Sub_right(a);
3612 ir_node *blk = get_nodes_block(n);
3614 n = new_rd_Sub(get_irn_dbg_info(n), current_ir_graph, blk, ra, la, mode);
3615 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_SUB);
3619 if (is_Mul(a)) { /* -(a * const) -> a * -const */
3620 ir_node *mul_l = get_Mul_left(a);
3621 ir_node *mul_r = get_Mul_right(a);
3622 tarval *tv = value_of(mul_r);
3623 if (tv != tarval_bad) {
3624 tv = tarval_neg(tv);
3625 if (tv != tarval_bad) {
3626 ir_node *cnst = new_Const(mode, tv);
3627 dbg_info *dbg = get_irn_dbg_info(a);
3628 ir_graph *irg = current_ir_graph;
3629 ir_node *block = get_nodes_block(a);
3630 n = new_rd_Mul(dbg, irg, block, mul_l, cnst, mode);
3631 DBG_OPT_ALGSIM2(oldn, a, n, FS_OPT_MINUS_MUL_C);
3638 } /* transform_node_Minus */
3641 * Transform a Cast_type(Const) into a new Const_type
3643 static ir_node *transform_node_Cast(ir_node *n) {
3645 ir_node *pred = get_Cast_op(n);
3646 ir_type *tp = get_irn_type(n);
3648 if (is_Const(pred) && get_Const_type(pred) != tp) {
3649 n = new_rd_Const_type(NULL, current_ir_graph, get_irn_n(pred, -1), get_irn_mode(pred),
3650 get_Const_tarval(pred), tp);
3651 DBG_OPT_CSTEVAL(oldn, n);
3652 } else if (is_SymConst(pred) && get_SymConst_value_type(pred) != tp) {
3653 n = new_rd_SymConst_type(NULL, current_ir_graph, get_irn_n(pred, -1), get_irn_mode(pred),
3654 get_SymConst_symbol(pred), get_SymConst_kind(pred), tp);
3655 DBG_OPT_CSTEVAL(oldn, n);
3659 } /* transform_node_Cast */
3662 * Transform a Proj(Load) with a non-null address.
3664 static ir_node *transform_node_Proj_Load(ir_node *proj) {
3665 if (get_opt_ldst_only_null_ptr_exceptions()) {
3666 if (get_irn_mode(proj) == mode_X) {
3667 ir_node *load = get_Proj_pred(proj);
3669 /* get the Load address */
3670 const ir_node *addr = get_Load_ptr(load);
3671 const ir_node *confirm;
3673 if (value_not_null(addr, &confirm)) {
3674 if (confirm == NULL) {
3675 /* this node may float if it did not depend on a Confirm */
3676 set_irn_pinned(load, op_pin_state_floats);
3678 if (get_Proj_proj(proj) == pn_Load_X_except) {
3679 DBG_OPT_EXC_REM(proj);
3680 return get_irg_bad(current_ir_graph);
3682 ir_node *blk = get_nodes_block(load);
3683 return new_r_Jmp(current_ir_graph, blk);
3689 } /* transform_node_Proj_Load */
3692 * Transform a Proj(Store) with a non-null address.
3694 static ir_node *transform_node_Proj_Store(ir_node *proj) {
3695 if (get_opt_ldst_only_null_ptr_exceptions()) {
3696 if (get_irn_mode(proj) == mode_X) {
3697 ir_node *store = get_Proj_pred(proj);
3699 /* get the load/store address */
3700 const ir_node *addr = get_Store_ptr(store);
3701 const ir_node *confirm;
3703 if (value_not_null(addr, &confirm)) {
3704 if (confirm == NULL) {
3705 /* this node may float if it did not depend on a Confirm */
3706 set_irn_pinned(store, op_pin_state_floats);
3708 if (get_Proj_proj(proj) == pn_Store_X_except) {
3709 DBG_OPT_EXC_REM(proj);
3710 return get_irg_bad(current_ir_graph);
3712 ir_node *blk = get_nodes_block(store);
3713 return new_r_Jmp(current_ir_graph, blk);
3719 } /* transform_node_Proj_Store */
3722 * Transform a Proj(Div) with a non-zero value.
3723 * Removes the exceptions and routes the memory to the NoMem node.
3725 static ir_node *transform_node_Proj_Div(ir_node *proj) {
3726 ir_node *div = get_Proj_pred(proj);
3727 ir_node *b = get_Div_right(div);
3728 ir_node *res, *new_mem;
3729 const ir_node *confirm;
3732 if (value_not_zero(b, &confirm)) {
3733 /* div(x, y) && y != 0 */
3734 if (confirm == NULL) {
3735 /* we are sure we have a Const != 0 */
3736 new_mem = get_Div_mem(div);
3737 new_mem = skip_Pin(new_mem);
3738 set_Div_mem(div, new_mem);
3739 set_irn_pinned(div, op_pin_state_floats);
3742 proj_nr = get_Proj_proj(proj);
3744 case pn_Div_X_regular:
3745 return new_r_Jmp(current_ir_graph, get_irn_n(div, -1));
3747 case pn_Div_X_except:
3748 /* we found an exception handler, remove it */
3749 DBG_OPT_EXC_REM(proj);
3753 res = get_Div_mem(div);
3754 new_mem = get_irg_no_mem(current_ir_graph);
3757 /* This node can only float up to the Confirm block */
3758 new_mem = new_r_Pin(current_ir_graph, get_nodes_block(confirm), new_mem);
3760 set_irn_pinned(div, op_pin_state_floats);
3761 /* this is a Div without exception, we can remove the memory edge */
3762 set_Div_mem(div, new_mem);
3767 } /* transform_node_Proj_Div */
3770 * Transform a Proj(Mod) with a non-zero value.
3771 * Removes the exceptions and routes the memory to the NoMem node.
3773 static ir_node *transform_node_Proj_Mod(ir_node *proj) {
3774 ir_node *mod = get_Proj_pred(proj);
3775 ir_node *b = get_Mod_right(mod);
3776 ir_node *res, *new_mem;
3777 const ir_node *confirm;
3780 if (value_not_zero(b, &confirm)) {
3781 /* mod(x, y) && y != 0 */
3782 proj_nr = get_Proj_proj(proj);
3784 if (confirm == NULL) {
3785 /* we are sure we have a Const != 0 */
3786 new_mem = get_Mod_mem(mod);
3787 new_mem = skip_Pin(new_mem);
3788 set_Mod_mem(mod, new_mem);
3789 set_irn_pinned(mod, op_pin_state_floats);
3794 case pn_Mod_X_regular:
3795 return new_r_Jmp(current_ir_graph, get_irn_n(mod, -1));
3797 case pn_Mod_X_except:
3798 /* we found an exception handler, remove it */
3799 DBG_OPT_EXC_REM(proj);
3803 res = get_Mod_mem(mod);
3804 new_mem = get_irg_no_mem(current_ir_graph);
3807 /* This node can only float up to the Confirm block */
3808 new_mem = new_r_Pin(current_ir_graph, get_nodes_block(confirm), new_mem);
3810 /* this is a Mod without exception, we can remove the memory edge */
3811 set_Mod_mem(mod, new_mem);
3814 if (get_Mod_left(mod) == b) {
3815 /* a % a = 0 if a != 0 */
3816 ir_mode *mode = get_irn_mode(proj);
3817 ir_node *res = new_Const(mode, get_mode_null(mode));
3819 DBG_OPT_CSTEVAL(mod, res);
3825 } /* transform_node_Proj_Mod */
3828 * Transform a Proj(DivMod) with a non-zero value.
3829 * Removes the exceptions and routes the memory to the NoMem node.
3831 static ir_node *transform_node_Proj_DivMod(ir_node *proj) {
3832 ir_node *divmod = get_Proj_pred(proj);
3833 ir_node *b = get_DivMod_right(divmod);
3834 ir_node *res, *new_mem;
3835 const ir_node *confirm;
3838 if (value_not_zero(b, &confirm)) {
3839 /* DivMod(x, y) && y != 0 */
3840 proj_nr = get_Proj_proj(proj);
3842 if (confirm == NULL) {
3843 /* we are sure we have a Const != 0 */
3844 new_mem = get_DivMod_mem(divmod);
3845 new_mem = skip_Pin(new_mem);
3846 set_DivMod_mem(divmod, new_mem);
3847 set_irn_pinned(divmod, op_pin_state_floats);
3852 case pn_DivMod_X_regular:
3853 return new_r_Jmp(current_ir_graph, get_irn_n(divmod, -1));
3855 case pn_DivMod_X_except:
3856 /* we found an exception handler, remove it */
3857 DBG_OPT_EXC_REM(proj);
3861 res = get_DivMod_mem(divmod);
3862 new_mem = get_irg_no_mem(current_ir_graph);
3865 /* This node can only float up to the Confirm block */
3866 new_mem = new_r_Pin(current_ir_graph, get_nodes_block(confirm), new_mem);
3868 /* this is a DivMod without exception, we can remove the memory edge */
3869 set_DivMod_mem(divmod, new_mem);
3872 case pn_DivMod_res_mod:
3873 if (get_DivMod_left(divmod) == b) {
3874 /* a % a = 0 if a != 0 */
3875 ir_mode *mode = get_irn_mode(proj);
3876 ir_node *res = new_Const(mode, get_mode_null(mode));
3878 DBG_OPT_CSTEVAL(divmod, res);
3884 } /* transform_node_Proj_DivMod */
3887 * Optimizes jump tables (CondIs or CondIu) by removing all impossible cases.
3889 static ir_node *transform_node_Proj_Cond(ir_node *proj) {
3890 if (get_opt_unreachable_code()) {
3891 ir_node *n = get_Proj_pred(proj);
3892 ir_node *b = get_Cond_selector(n);
3894 if (mode_is_int(get_irn_mode(b))) {
3895 tarval *tb = value_of(b);
3897 if (tb != tarval_bad) {
3898 /* we have a constant switch */
3899 long num = get_Proj_proj(proj);
3901 if (num != get_Cond_defaultProj(n)) { /* we cannot optimize default Proj's yet */
3902 if (get_tarval_long(tb) == num) {
3903 /* Do NOT create a jump here, or we will have 2 control flow ops
3904 * in a block. This case is optimized away in optimize_cf(). */
3907 /* this case will NEVER be taken, kill it */
3908 return get_irg_bad(current_ir_graph);
3915 } /* transform_node_Proj_Cond */
3918 * Create a 0 constant of given mode.
3920 static ir_node *create_zero_const(ir_mode *mode) {
3921 tarval *tv = get_mode_null(mode);
3922 ir_node *cnst = new_Const(mode, tv);
3927 /* the order of the values is important! */
3928 typedef enum const_class {
3934 static const_class classify_const(const ir_node* n)
3936 if (is_Const(n)) return const_const;
3937 if (is_irn_constlike(n)) return const_like;
3942 * Determines whether r is more constlike or has a larger index (in that order)
3945 static int operands_are_normalized(const ir_node *l, const ir_node *r)
3947 const const_class l_order = classify_const(l);
3948 const const_class r_order = classify_const(r);
3950 l_order > r_order ||
3951 (l_order == r_order && get_irn_idx(l) <= get_irn_idx(r));
3955 * Normalizes and optimizes Cmp nodes.
3957 static ir_node *transform_node_Proj_Cmp(ir_node *proj) {
3958 ir_node *n = get_Proj_pred(proj);
3959 ir_node *left = get_Cmp_left(n);
3960 ir_node *right = get_Cmp_right(n);
3963 ir_mode *mode = NULL;
3964 long proj_nr = get_Proj_proj(proj);
3966 /* we can evaluate some cases directly */
3969 return new_Const(mode_b, get_tarval_b_false());
3971 return new_Const(mode_b, get_tarval_b_true());
3973 if (!mode_is_float(get_irn_mode(left)))
3974 return new_Const(mode_b, get_tarval_b_true());
3980 /* remove Casts of both sides */
3981 left = skip_Cast(left);
3982 right = skip_Cast(right);
3984 /* Remove unnecessary conversions */
3985 /* TODO handle constants */
3986 if (is_Conv(left) && is_Conv(right)) {
3987 ir_mode *mode = get_irn_mode(left);
3988 ir_node *op_left = get_Conv_op(left);
3989 ir_node *op_right = get_Conv_op(right);
3990 ir_mode *mode_left = get_irn_mode(op_left);
3991 ir_mode *mode_right = get_irn_mode(op_right);
3993 if (smaller_mode(mode_left, mode) && smaller_mode(mode_right, mode)
3994 && mode_left != mode_b && mode_right != mode_b) {
3995 ir_graph *irg = current_ir_graph;
3996 ir_node *block = get_nodes_block(n);
3998 if (mode_left == mode_right) {
4002 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV_CONV);
4003 } else if (smaller_mode(mode_left, mode_right)) {
4004 left = new_r_Conv(irg, block, op_left, mode_right);
4007 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV);
4008 } else if (smaller_mode(mode_right, mode_left)) {
4010 right = new_r_Conv(irg, block, op_right, mode_left);
4012 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV);
4017 /* remove operation on both sides if possible */
4018 if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
4020 * The following operations are NOT safe for floating point operations, for instance
4021 * 1.0 + inf == 2.0 + inf, =/=> x == y
4023 if (mode_is_int(get_irn_mode(left))) {
4024 unsigned lop = get_irn_opcode(left);
4026 if (lop == get_irn_opcode(right)) {
4027 ir_node *ll, *lr, *rl, *rr;
4029 /* same operation on both sides, try to remove */
4033 /* ~a CMP ~b => a CMP b, -a CMP -b ==> a CMP b */
4034 left = get_unop_op(left);
4035 right = get_unop_op(right);
4037 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4040 ll = get_Add_left(left);
4041 lr = get_Add_right(left);
4042 rl = get_Add_left(right);
4043 rr = get_Add_right(right);
4046 /* X + a CMP X + b ==> a CMP b */
4050 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4051 } else if (ll == rr) {
4052 /* X + a CMP b + X ==> a CMP b */
4056 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4057 } else if (lr == rl) {
4058 /* a + X CMP X + b ==> a CMP b */
4062 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4063 } else if (lr == rr) {
4064 /* a + X CMP b + X ==> a CMP b */
4068 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4072 ll = get_Sub_left(left);
4073 lr = get_Sub_right(left);
4074 rl = get_Sub_left(right);
4075 rr = get_Sub_right(right);
4078 /* X - a CMP X - b ==> a CMP b */
4082 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4083 } else if (lr == rr) {
4084 /* a - X CMP b - X ==> a CMP b */
4088 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4092 if (get_Rotl_right(left) == get_Rotl_right(right)) {
4093 /* a ROTL X CMP b ROTL X ==> a CMP b */
4094 left = get_Rotl_left(left);
4095 right = get_Rotl_left(right);
4097 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4105 /* X+A == A, A+X == A, A-X == A -> X == 0 */
4106 if (is_Add(left) || is_Sub(left)) {
4107 ir_node *ll = get_binop_left(left);
4108 ir_node *lr = get_binop_right(left);
4110 if (lr == right && is_Add(left)) {
4117 right = create_zero_const(get_irn_mode(left));
4119 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4122 if (is_Add(right) || is_Sub(right)) {
4123 ir_node *rl = get_binop_left(right);
4124 ir_node *rr = get_binop_right(right);
4126 if (rr == left && is_Add(right)) {
4133 right = create_zero_const(get_irn_mode(left));
4135 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_OP);
4138 } /* mode_is_int(...) */
4139 } /* proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg */
4141 /* replace mode_b compares with ands/ors */
4142 if (get_irn_mode(left) == mode_b) {
4143 ir_graph *irg = current_ir_graph;
4144 ir_node *block = get_nodes_block(n);
4148 case pn_Cmp_Le: bres = new_r_Or( irg, block, new_r_Not(irg, block, left, mode_b), right, mode_b); break;
4149 case pn_Cmp_Lt: bres = new_r_And(irg, block, new_r_Not(irg, block, left, mode_b), right, mode_b); break;
4150 case pn_Cmp_Ge: bres = new_r_Or( irg, block, left, new_r_Not(irg, block, right, mode_b), mode_b); break;
4151 case pn_Cmp_Gt: bres = new_r_And(irg, block, left, new_r_Not(irg, block, right, mode_b), mode_b); break;
4152 case pn_Cmp_Lg: bres = new_r_Eor(irg, block, left, right, mode_b); break;
4153 case pn_Cmp_Eq: bres = new_r_Not(irg, block, new_r_Eor(irg, block, left, right, mode_b), mode_b); break;
4154 default: bres = NULL;
4157 DBG_OPT_ALGSIM0(n, bres, FS_OPT_CMP_TO_BOOL);
4163 * First step: normalize the compare op
4164 * by placing the constant on the right side
4165 * or moving the lower address node to the left.
4167 if (!operands_are_normalized(left, right)) {
4173 proj_nr = get_inversed_pnc(proj_nr);
4178 * Second step: Try to reduce the magnitude
4179 * of a constant. This may help to generate better code
4180 * later and may help to normalize more compares.
4181 * Of course this is only possible for integer values.
4183 tv = value_of(right);
4184 if (tv != tarval_bad) {
4185 mode = get_irn_mode(right);
4187 /* TODO extend to arbitrary constants */
4188 if (is_Conv(left) && tarval_is_null(tv)) {
4189 ir_node *op = get_Conv_op(left);
4190 ir_mode *op_mode = get_irn_mode(op);
4193 * UpConv(x) REL 0 ==> x REL 0
4195 if (get_mode_size_bits(mode) > get_mode_size_bits(op_mode) &&
4196 ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) ||
4197 mode_is_signed(mode) || !mode_is_signed(op_mode))) {
4198 tv = get_mode_null(op_mode);
4202 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CONV);
4206 if (tv != tarval_bad) {
4207 /* the following optimization is possible on modes without Overflow
4208 * on Unary Minus or on == and !=:
4209 * -a CMP c ==> a swap(CMP) -c
4211 * Beware: for two-complement Overflow may occur, so only == and != can
4212 * be optimized, see this:
4213 * -MININT < 0 =/=> MININT > 0 !!!
4215 if (is_Minus(left) &&
4216 (!mode_overflow_on_unary_Minus(mode) ||
4217 (mode_is_int(mode) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)))) {
4218 tv = tarval_neg(tv);
4220 if (tv != tarval_bad) {
4221 left = get_Minus_op(left);
4222 proj_nr = get_inversed_pnc(proj_nr);
4224 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4226 } else if (is_Not(left) && (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg)) {
4227 /* Not(a) ==/!= c ==> a ==/!= Not(c) */
4228 tv = tarval_not(tv);
4230 if (tv != tarval_bad) {
4231 left = get_Not_op(left);
4233 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4237 /* for integer modes, we have more */
4238 if (mode_is_int(mode)) {
4239 /* Ne includes Unordered which is not possible on integers.
4240 * However, frontends often use this wrong, so fix it here */
4241 if (proj_nr & pn_Cmp_Uo) {
4242 proj_nr &= ~pn_Cmp_Uo;
4243 set_Proj_proj(proj, proj_nr);
4246 /* c > 0 : a < c ==> a <= (c-1) a >= c ==> a > (c-1) */
4247 if ((proj_nr == pn_Cmp_Lt || proj_nr == pn_Cmp_Ge) &&
4248 tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Gt) {
4249 tv = tarval_sub(tv, get_mode_one(mode), NULL);
4251 if (tv != tarval_bad) {
4252 proj_nr ^= pn_Cmp_Eq;
4254 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CNST_MAGN);
4257 /* c < 0 : a > c ==> a >= (c+1) a <= c ==> a < (c+1) */
4258 else if ((proj_nr == pn_Cmp_Gt || proj_nr == pn_Cmp_Le) &&
4259 tarval_cmp(tv, get_mode_null(mode)) == pn_Cmp_Lt) {
4260 tv = tarval_add(tv, get_mode_one(mode));
4262 if (tv != tarval_bad) {
4263 proj_nr ^= pn_Cmp_Eq;
4265 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CNST_MAGN);
4269 /* the following reassociations work only for == and != */
4270 if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
4272 #if 0 /* Might be not that good in general */
4273 /* a-b == 0 ==> a == b, a-b != 0 ==> a != b */
4274 if (tarval_is_null(tv) && is_Sub(left)) {
4275 right = get_Sub_right(left);
4276 left = get_Sub_left(left);
4278 tv = value_of(right);
4280 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4284 if (tv != tarval_bad) {
4285 /* a-c1 == c2 ==> a == c2+c1, a-c1 != c2 ==> a != c2+c1 */
4287 ir_node *c1 = get_Sub_right(left);
4288 tarval *tv2 = value_of(c1);
4290 if (tv2 != tarval_bad) {
4291 tv2 = tarval_add(tv, value_of(c1));
4293 if (tv2 != tarval_bad) {
4294 left = get_Sub_left(left);
4297 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4301 /* a+c1 == c2 ==> a == c2-c1, a+c1 != c2 ==> a != c2-c1 */
4302 else if (is_Add(left)) {
4303 ir_node *a_l = get_Add_left(left);
4304 ir_node *a_r = get_Add_right(left);
4308 if (is_Const(a_l)) {
4310 tv2 = value_of(a_l);
4313 tv2 = value_of(a_r);
4316 if (tv2 != tarval_bad) {
4317 tv2 = tarval_sub(tv, tv2, NULL);
4319 if (tv2 != tarval_bad) {
4323 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4327 /* -a == c ==> a == -c, -a != c ==> a != -c */
4328 else if (is_Minus(left)) {
4329 tarval *tv2 = tarval_sub(get_mode_null(mode), tv, NULL);
4331 if (tv2 != tarval_bad) {
4332 left = get_Minus_op(left);
4335 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_OP_C);
4340 /* the following reassociations work only for <= */
4341 else if (proj_nr == pn_Cmp_Le || proj_nr == pn_Cmp_Lt) {
4342 if (tv != tarval_bad) {
4343 /* c >= 0 : Abs(a) <= c ==> (unsigned)(a + c) <= 2*c */
4344 if (get_irn_op(left) == op_Abs) { // TODO something is missing here
4350 if (proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) {
4351 switch (get_irn_opcode(left)) {
4355 c1 = get_And_right(left);
4358 * And(x, C1) == C2 ==> FALSE if C2 & C1 != C2
4359 * And(x, C1) != C2 ==> TRUE if C2 & C1 != C2
4361 tarval *mask = tarval_and(get_Const_tarval(c1), tv);
4363 /* TODO: move to constant evaluation */
4364 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4365 c1 = new_Const(mode_b, tv);
4366 DBG_OPT_CSTEVAL(proj, c1);
4370 if (tarval_is_single_bit(tv)) {
4372 * optimization for AND:
4374 * And(x, C) == C ==> And(x, C) != 0
4375 * And(x, C) != C ==> And(X, C) == 0
4377 * if C is a single Bit constant.
4380 /* check for Constant's match. We have check hare the tarvals,
4381 because our const might be changed */
4382 if (get_Const_tarval(c1) == tv) {
4383 /* fine: do the transformation */
4384 tv = get_mode_null(get_tarval_mode(tv));
4385 proj_nr ^= pn_Cmp_Leg;
4387 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_CNST_MAGN);
4393 c1 = get_Or_right(left);
4394 if (is_Const(c1) && tarval_is_null(tv)) {
4396 * Or(x, C) == 0 && C != 0 ==> FALSE
4397 * Or(x, C) != 0 && C != 0 ==> TRUE
4399 if (! tarval_is_null(get_Const_tarval(c1))) {
4400 /* TODO: move to constant evaluation */
4401 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4402 c1 = new_Const(mode_b, tv);
4403 DBG_OPT_CSTEVAL(proj, c1);
4410 * optimize x << c1 == c into x & (-1 >>u c1) == c >> c1 if c & (-1 << c1) == c
4412 * optimize x << c1 != c into x & (-1 >>u c1) != c >> c1 if c & (-1 << c1) == c
4415 c1 = get_Shl_right(left);
4417 tarval *tv1 = get_Const_tarval(c1);
4418 ir_mode *mode = get_irn_mode(left);
4419 tarval *minus1 = get_mode_all_one(mode);
4420 tarval *amask = tarval_shr(minus1, tv1);
4421 tarval *cmask = tarval_shl(minus1, tv1);
4424 if (tarval_and(tv, cmask) != tv) {
4425 /* condition not met */
4426 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4427 c1 = new_Const(mode_b, tv);
4428 DBG_OPT_CSTEVAL(proj, c1);
4431 sl = get_Shl_left(left);
4432 blk = get_nodes_block(n);
4433 left = new_rd_And(get_irn_dbg_info(left), current_ir_graph, blk, sl, new_Const(mode, amask), mode);
4434 tv = tarval_shr(tv, tv1);
4436 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_SHF_TO_AND);
4441 * optimize x >>u c1 == c into x & (-1 << c1) == c << c1 if c & (-1 >>u c1) == c
4443 * optimize x >>u c1 != c into x & (-1 << c1) != c << c1 if c & (-1 >>u c1) == c
4446 c1 = get_Shr_right(left);
4448 tarval *tv1 = get_Const_tarval(c1);
4449 ir_mode *mode = get_irn_mode(left);
4450 tarval *minus1 = get_mode_all_one(mode);
4451 tarval *amask = tarval_shl(minus1, tv1);
4452 tarval *cmask = tarval_shr(minus1, tv1);
4455 if (tarval_and(tv, cmask) != tv) {
4456 /* condition not met */
4457 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4458 c1 = new_Const(mode_b, tv);
4459 DBG_OPT_CSTEVAL(proj, c1);
4462 sl = get_Shr_left(left);
4463 blk = get_nodes_block(n);
4464 left = new_rd_And(get_irn_dbg_info(left), current_ir_graph, blk, sl, new_Const(mode, amask), mode);
4465 tv = tarval_shl(tv, tv1);
4467 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_SHF_TO_AND);
4472 * optimize x >>s c1 == c into x & (-1 << c1) == c << c1 if (c >>s (BITS - c1)) \in {0,-1}
4474 * optimize x >>s c1 != c into x & (-1 << c1) != c << c1 if (c >>s (BITS - c1)) \in {0,-1}
4477 c1 = get_Shrs_right(left);
4479 tarval *tv1 = get_Const_tarval(c1);
4480 ir_mode *mode = get_irn_mode(left);
4481 tarval *minus1 = get_mode_all_one(mode);
4482 tarval *amask = tarval_shl(minus1, tv1);
4483 tarval *cond = new_tarval_from_long(get_mode_size_bits(mode), get_tarval_mode(tv1));
4486 cond = tarval_sub(cond, tv1, NULL);
4487 cond = tarval_shrs(tv, cond);
4489 if (!tarval_is_all_one(cond) && !tarval_is_null(cond)) {
4490 /* condition not met */
4491 tv = proj_nr == pn_Cmp_Eq ? get_tarval_b_false() : get_tarval_b_true();
4492 c1 = new_Const(mode_b, tv);
4493 DBG_OPT_CSTEVAL(proj, c1);
4496 sl = get_Shrs_left(left);
4497 blk = get_nodes_block(n);
4498 left = new_rd_And(get_irn_dbg_info(left), current_ir_graph, blk, sl, new_Const(mode, amask), mode);
4499 tv = tarval_shl(tv, tv1);
4501 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_SHF_TO_AND);
4506 } /* tarval != bad */
4509 if (changed & 2) /* need a new Const */
4510 right = new_Const(mode, tv);
4512 if ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) && is_Const(right) && is_Const_null(right) && is_Proj(left)) {
4513 ir_node *op = get_Proj_pred(left);
4515 if ((is_Mod(op) && get_Proj_proj(left) == pn_Mod_res) ||
4516 (is_DivMod(op) && get_Proj_proj(left) == pn_DivMod_res_mod)) {
4517 ir_node *c = get_binop_right(op);
4520 tarval *tv = get_Const_tarval(c);
4522 if (tarval_is_single_bit(tv)) {
4523 /* special case: (x % 2^n) CMP 0 ==> x & (2^n-1) CMP 0 */
4524 ir_node *v = get_binop_left(op);
4525 ir_node *blk = get_irn_n(op, -1);
4526 ir_mode *mode = get_irn_mode(v);
4528 tv = tarval_sub(tv, get_mode_one(mode), NULL);
4529 left = new_rd_And(get_irn_dbg_info(op), current_ir_graph, blk, v, new_Const(mode, tv), mode);
4531 DBG_OPT_ALGSIM0(n, n, FS_OPT_CMP_MOD_TO_AND);
4538 ir_node *block = get_nodes_block(n);
4540 /* create a new compare */
4541 n = new_rd_Cmp(get_irn_dbg_info(n), current_ir_graph, block, left, right);
4542 proj = new_rd_Proj(get_irn_dbg_info(proj), current_ir_graph, block, n, get_irn_mode(proj), proj_nr);
4546 } /* transform_node_Proj_Cmp */
4549 * Optimize CopyB(mem, x, x) into a Nop.
4551 static ir_node *transform_node_Proj_CopyB(ir_node *proj) {
4552 ir_node *copyb = get_Proj_pred(proj);
4553 ir_node *a = get_CopyB_dst(copyb);
4554 ir_node *b = get_CopyB_src(copyb);
4557 switch (get_Proj_proj(proj)) {
4558 case pn_CopyB_X_regular:
4559 /* Turn CopyB into a tuple (mem, jmp, bad, bad) */
4560 DBG_OPT_EXC_REM(proj);
4561 proj = new_r_Jmp(current_ir_graph, get_nodes_block(copyb));
4563 case pn_CopyB_M_except:
4564 case pn_CopyB_X_except:
4565 DBG_OPT_EXC_REM(proj);
4566 proj = get_irg_bad(current_ir_graph);
4573 } /* transform_node_Proj_CopyB */
4576 * Optimize Bounds(idx, idx, upper) into idx.
4578 static ir_node *transform_node_Proj_Bound(ir_node *proj) {
4579 ir_node *oldn = proj;
4580 ir_node *bound = get_Proj_pred(proj);
4581 ir_node *idx = get_Bound_index(bound);
4582 ir_node *pred = skip_Proj(idx);
4585 if (idx == get_Bound_lower(bound))
4587 else if (is_Bound(pred)) {
4589 * idx was Bounds checked in the same MacroBlock previously,
4590 * it is still valid if lower <= pred_lower && pred_upper <= upper.
4592 ir_node *lower = get_Bound_lower(bound);
4593 ir_node *upper = get_Bound_upper(bound);
4594 if (get_Bound_lower(pred) == lower &&
4595 get_Bound_upper(pred) == upper &&
4596 get_irn_MacroBlock(bound) == get_irn_MacroBlock(pred)) {
4598 * One could expect that we simply return the previous
4599 * Bound here. However, this would be wrong, as we could
4600 * add an exception Proj to a new location then.
4601 * So, we must turn in into a tuple.
4607 /* Turn Bound into a tuple (mem, jmp, bad, idx) */
4608 switch (get_Proj_proj(proj)) {
4610 DBG_OPT_EXC_REM(proj);
4611 proj = get_Bound_mem(bound);
4613 case pn_Bound_X_except:
4614 DBG_OPT_EXC_REM(proj);
4615 proj = get_irg_bad(current_ir_graph);
4619 DBG_OPT_ALGSIM0(oldn, proj, FS_OPT_NOP);
4621 case pn_Bound_X_regular:
4622 DBG_OPT_EXC_REM(proj);
4623 proj = new_r_Jmp(current_ir_graph, get_nodes_block(bound));
4630 } /* transform_node_Proj_Bound */
4633 * Does all optimizations on nodes that must be done on it's Proj's
4634 * because of creating new nodes.
4636 static ir_node *transform_node_Proj(ir_node *proj) {
4637 ir_node *n = get_Proj_pred(proj);
4639 if (n->op->ops.transform_node_Proj)
4640 return n->op->ops.transform_node_Proj(proj);
4642 } /* transform_node_Proj */
4645 * Move Confirms down through Phi nodes.
4647 static ir_node *transform_node_Phi(ir_node *phi) {
4649 ir_mode *mode = get_irn_mode(phi);
4651 if (mode_is_reference(mode)) {
4652 n = get_irn_arity(phi);
4654 /* Beware of Phi0 */
4656 ir_node *pred = get_irn_n(phi, 0);
4657 ir_node *bound, *new_Phi, *block, **in;
4660 if (! is_Confirm(pred))
4663 bound = get_Confirm_bound(pred);
4664 pnc = get_Confirm_cmp(pred);
4666 NEW_ARR_A(ir_node *, in, n);
4667 in[0] = get_Confirm_value(pred);
4669 for (i = 1; i < n; ++i) {
4670 pred = get_irn_n(phi, i);
4672 if (! is_Confirm(pred) ||
4673 get_Confirm_bound(pred) != bound ||
4674 get_Confirm_cmp(pred) != pnc)
4676 in[i] = get_Confirm_value(pred);
4678 /* move the Confirm nodes "behind" the Phi */
4679 block = get_irn_n(phi, -1);
4680 new_Phi = new_r_Phi(current_ir_graph, block, n, in, get_irn_mode(phi));
4681 return new_r_Confirm(current_ir_graph, block, new_Phi, bound, pnc);
4685 } /* transform_node_Phi */
4688 * Returns the operands of a commutative bin-op, if one operand is
4689 * a const, it is returned as the second one.
4691 static void get_comm_Binop_Ops(ir_node *binop, ir_node **a, ir_node **c) {
4692 ir_node *op_a = get_binop_left(binop);
4693 ir_node *op_b = get_binop_right(binop);
4695 assert(is_op_commutative(get_irn_op(binop)));
4697 if (is_Const(op_a)) {
4704 } /* get_comm_Binop_Ops */
4707 * Optimize a Or(And(Or(And(v,c4),c3),c2),c1) pattern if possible.
4708 * Such pattern may arise in bitfield stores.
4710 * value c4 value c4 & c2
4711 * AND c3 AND c1 | c3
4718 * AND c1 ===> OR if (c1 | c2) == 0x111..11
4721 static ir_node *transform_node_Or_bf_store(ir_node *or) {
4724 ir_node *and_l, *c3;
4725 ir_node *value, *c4;
4726 ir_node *new_and, *new_const, *block;
4727 ir_mode *mode = get_irn_mode(or);
4729 tarval *tv1, *tv2, *tv3, *tv4, *tv, *n_tv4, *n_tv2;
4732 get_comm_Binop_Ops(or, &and, &c1);
4733 if (!is_Const(c1) || !is_And(and))
4736 get_comm_Binop_Ops(and, &or_l, &c2);
4740 tv1 = get_Const_tarval(c1);
4741 tv2 = get_Const_tarval(c2);
4743 tv = tarval_or(tv1, tv2);
4744 if (tarval_is_all_one(tv)) {
4745 /* the AND does NOT clear a bit with isn't set by the OR */
4746 set_Or_left(or, or_l);
4747 set_Or_right(or, c1);
4749 /* check for more */
4756 get_comm_Binop_Ops(or_l, &and_l, &c3);
4757 if (!is_Const(c3) || !is_And(and_l))
4760 get_comm_Binop_Ops(and_l, &value, &c4);
4764 /* ok, found the pattern, check for conditions */
4765 assert(mode == get_irn_mode(and));
4766 assert(mode == get_irn_mode(or_l));
4767 assert(mode == get_irn_mode(and_l));
4769 tv3 = get_Const_tarval(c3);
4770 tv4 = get_Const_tarval(c4);
4772 tv = tarval_or(tv4, tv2);
4773 if (!tarval_is_all_one(tv)) {
4774 /* have at least one 0 at the same bit position */
4778 n_tv4 = tarval_not(tv4);
4779 if (tv3 != tarval_and(tv3, n_tv4)) {
4780 /* bit in the or_mask is outside the and_mask */
4784 n_tv2 = tarval_not(tv2);
4785 if (tv1 != tarval_and(tv1, n_tv2)) {
4786 /* bit in the or_mask is outside the and_mask */
4790 /* ok, all conditions met */
4791 block = get_irn_n(or, -1);
4793 new_and = new_r_And(current_ir_graph, block,
4794 value, new_r_Const(current_ir_graph, block, mode, tarval_and(tv4, tv2)), mode);
4796 new_const = new_r_Const(current_ir_graph, block, mode, tarval_or(tv3, tv1));
4798 set_Or_left(or, new_and);
4799 set_Or_right(or, new_const);
4801 /* check for more */
4803 } /* transform_node_Or_bf_store */
4806 * Optimize an Or(shl(x, c), shr(x, bits - c)) into a Rotl
4808 static ir_node *transform_node_Or_Rotl(ir_node *or) {
4809 ir_mode *mode = get_irn_mode(or);
4810 ir_node *shl, *shr, *block;
4811 ir_node *irn, *x, *c1, *c2, *v, *sub, *n, *rotval;
4814 if (! mode_is_int(mode))
4817 shl = get_binop_left(or);
4818 shr = get_binop_right(or);
4827 } else if (!is_Shl(shl)) {
4829 } else if (!is_Shr(shr)) {
4832 x = get_Shl_left(shl);
4833 if (x != get_Shr_left(shr))
4836 c1 = get_Shl_right(shl);
4837 c2 = get_Shr_right(shr);
4838 if (is_Const(c1) && is_Const(c2)) {
4839 tv1 = get_Const_tarval(c1);
4840 if (! tarval_is_long(tv1))
4843 tv2 = get_Const_tarval(c2);
4844 if (! tarval_is_long(tv2))
4847 if (get_tarval_long(tv1) + get_tarval_long(tv2)
4848 != (int) get_mode_size_bits(mode))
4851 /* yet, condition met */
4852 block = get_nodes_block(or);
4854 n = new_r_Rotl(current_ir_graph, block, x, c1, mode);
4856 DBG_OPT_ALGSIM1(or, shl, shr, n, FS_OPT_OR_SHFT_TO_ROTL);
4863 rotval = sub; /* a Rot right is not supported, so use a rot left */
4864 } else if (is_Sub(c2)) {
4870 if (get_Sub_right(sub) != v)
4873 c1 = get_Sub_left(sub);
4877 tv1 = get_Const_tarval(c1);
4878 if (! tarval_is_long(tv1))
4881 if (get_tarval_long(tv1) != (int) get_mode_size_bits(mode))
4884 /* yet, condition met */
4885 block = get_nodes_block(or);
4887 n = new_r_Rotl(current_ir_graph, block, x, rotval, mode);
4889 DBG_OPT_ALGSIM0(or, n, FS_OPT_OR_SHFT_TO_ROTL);
4891 } /* transform_node_Or_Rotl */
4896 static ir_node *transform_node_Or(ir_node *n) {
4897 ir_node *c, *oldn = n;
4898 ir_node *a = get_Or_left(n);
4899 ir_node *b = get_Or_right(n);
4902 if (is_Not(a) && is_Not(b)) {
4903 /* ~a | ~b = ~(a&b) */
4904 ir_node *block = get_nodes_block(n);
4906 mode = get_irn_mode(n);
4909 n = new_rd_And(get_irn_dbg_info(n), current_ir_graph, block, a, b, mode);
4910 n = new_rd_Not(get_irn_dbg_info(n), current_ir_graph, block, n, mode);
4911 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_DEMORGAN);
4915 /* we can evaluate 2 Projs of the same Cmp */
4916 if (get_irn_mode(n) == mode_b && is_Proj(a) && is_Proj(b)) {
4917 ir_node *pred_a = get_Proj_pred(a);
4918 ir_node *pred_b = get_Proj_pred(b);
4919 if (pred_a == pred_b) {
4920 dbg_info *dbgi = get_irn_dbg_info(n);
4921 ir_node *block = get_nodes_block(pred_a);
4922 pn_Cmp pn_a = get_Proj_proj(a);
4923 pn_Cmp pn_b = get_Proj_proj(b);
4924 /* yes, we can simply calculate with pncs */
4925 pn_Cmp new_pnc = pn_a | pn_b;
4927 return new_rd_Proj(dbgi, current_ir_graph, block, pred_a, mode_b,
4932 mode = get_irn_mode(n);
4933 HANDLE_BINOP_PHI(tarval_or, a, b, c, mode);
4935 n = transform_node_Or_bf_store(n);
4936 n = transform_node_Or_Rotl(n);
4940 n = transform_bitwise_distributive(n, transform_node_Or);
4943 } /* transform_node_Or */
4947 static ir_node *transform_node(ir_node *n);
4950 * Optimize (a >> c1) >> c2), works for Shr, Shrs, Shl, Rotl.
4952 * Should be moved to reassociation?
4954 static ir_node *transform_node_shift(ir_node *n) {
4955 ir_node *left, *right;
4957 tarval *tv1, *tv2, *res;
4958 ir_node *in[2], *irn, *block;
4960 left = get_binop_left(n);
4962 /* different operations */
4963 if (get_irn_op(left) != get_irn_op(n))
4966 right = get_binop_right(n);
4967 tv1 = value_of(right);
4968 if (tv1 == tarval_bad)
4971 tv2 = value_of(get_binop_right(left));
4972 if (tv2 == tarval_bad)
4975 res = tarval_add(tv1, tv2);
4976 mode = get_irn_mode(n);
4978 /* beware: a simple replacement works only, if res < modulo shift */
4980 int modulo_shf = get_mode_modulo_shift(mode);
4981 assert(modulo_shf >= (int) get_mode_size_bits(mode));
4982 if (modulo_shf > 0) {
4983 tarval *modulo = new_tarval_from_long(modulo_shf,
4984 get_tarval_mode(res));
4986 /* shifting too much */
4987 if (!(tarval_cmp(res, modulo) & pn_Cmp_Lt)) {
4989 ir_graph *irg = get_irn_irg(n);
4990 ir_node *block = get_nodes_block(n);
4991 dbg_info *dbgi = get_irn_dbg_info(n);
4992 ir_node *cnst = new_Const(mode_Iu, new_tarval_from_long(get_mode_size_bits(mode)-1, mode_Iu));
4993 return new_rd_Shrs(dbgi, irg, block, get_binop_left(left),
4997 return new_Const(mode, get_mode_null(mode));
5001 res = tarval_mod(res, new_tarval_from_long(get_mode_size_bits(mode), get_tarval_mode(res)));
5004 /* ok, we can replace it */
5005 block = get_nodes_block(n);
5007 in[0] = get_binop_left(left);
5008 in[1] = new_r_Const(current_ir_graph, block, get_tarval_mode(res), res);
5010 irn = new_ir_node(NULL, current_ir_graph, block, get_irn_op(n), mode, 2, in);
5012 DBG_OPT_ALGSIM0(n, irn, FS_OPT_REASSOC_SHIFT);
5014 return transform_node(irn);
5015 } /* transform_node_shift */
5018 * normalisation: (x & c1) >> c2 to (x >> c2) & (c1 >> c2)
5020 * - and, or, xor instead of &
5021 * - Shl, Shr, Shrs, rotl instead of >>
5022 * (with a special case for Or/Xor + Shrs)
5024 static ir_node *transform_node_bitop_shift(ir_node *n) {
5026 ir_node *right = get_binop_right(n);
5027 ir_mode *mode = get_irn_mode(n);
5028 ir_node *bitop_left;
5029 ir_node *bitop_right;
5041 assert(is_Shrs(n) || is_Shr(n) || is_Shl(n) || is_Rotl(n));
5043 if (!is_Const(right))
5046 left = get_binop_left(n);
5047 op_left = get_irn_op(left);
5048 if (op_left != op_And && op_left != op_Or && op_left != op_Eor)
5051 /* doing it with Shrs is not legal if the Or/Eor affects the topmost bit */
5052 if (is_Shrs(n) && (op_left == op_Or || op_left == op_Eor)) {
5053 /* TODO: test if sign bit is affectes */
5057 bitop_right = get_binop_right(left);
5058 if (!is_Const(bitop_right))
5061 bitop_left = get_binop_left(left);
5063 irg = get_irn_irg(n);
5064 block = get_nodes_block(n);
5065 dbgi = get_irn_dbg_info(n);
5066 tv1 = get_Const_tarval(bitop_right);
5067 tv2 = get_Const_tarval(right);
5069 assert(get_tarval_mode(tv1) == mode);
5072 new_shift = new_rd_Shl(dbgi, irg, block, bitop_left, right, mode);
5073 tv_shift = tarval_shl(tv1, tv2);
5074 } else if(is_Shr(n)) {
5075 new_shift = new_rd_Shr(dbgi, irg, block, bitop_left, right, mode);
5076 tv_shift = tarval_shr(tv1, tv2);
5077 } else if(is_Shrs(n)) {
5078 new_shift = new_rd_Shrs(dbgi, irg, block, bitop_left, right, mode);
5079 tv_shift = tarval_shrs(tv1, tv2);
5082 new_shift = new_rd_Rotl(dbgi, irg, block, bitop_left, right, mode);
5083 tv_shift = tarval_rotl(tv1, tv2);
5086 assert(get_tarval_mode(tv_shift) == mode);
5087 new_const = new_Const(mode, tv_shift);
5089 if (op_left == op_And) {
5090 new_bitop = new_rd_And(dbgi, irg, block, new_shift, new_const, mode);
5091 } else if(op_left == op_Or) {
5092 new_bitop = new_rd_Or(dbgi, irg, block, new_shift, new_const, mode);
5094 assert(op_left == op_Eor);
5095 new_bitop = new_rd_Eor(dbgi, irg, block, new_shift, new_const, mode);
5103 * (x << c1) >> c2 <=> x OP (c2-c1) & ((-1 << c1) >> c2)
5105 * (x >> c1) << c2 <=> x OP (c2-c1) & ((-1 >> c1) << c2)
5106 * (also with x >>s c1 when c1>=c2)
5108 static ir_node *transform_node_shl_shr(ir_node *n) {
5110 ir_node *right = get_binop_right(n);
5126 assert(is_Shl(n) || is_Shr(n) || is_Shrs(n));
5128 if (!is_Const(right))
5131 left = get_binop_left(n);
5132 mode = get_irn_mode(n);
5133 if (is_Shl(n) && (is_Shr(left) || is_Shrs(left))) {
5134 ir_node *shr_right = get_binop_right(left);
5136 if (!is_Const(shr_right))
5139 x = get_binop_left(left);
5140 tv_shr = get_Const_tarval(shr_right);
5141 tv_shl = get_Const_tarval(right);
5143 if (is_Shrs(left)) {
5144 /* shrs variant only allowed if c1 >= c2 */
5145 if (! (tarval_cmp(tv_shl, tv_shr) & pn_Cmp_Ge))
5148 tv_mask = tarval_shrs(get_mode_all_one(mode), tv_shr);
5151 tv_mask = tarval_shr(get_mode_all_one(mode), tv_shr);
5153 tv_mask = tarval_shl(tv_mask, tv_shl);
5154 } else if(is_Shr(n) && is_Shl(left)) {
5155 ir_node *shl_right = get_Shl_right(left);
5157 if (!is_Const(shl_right))
5160 x = get_Shl_left(left);
5161 tv_shr = get_Const_tarval(right);
5162 tv_shl = get_Const_tarval(shl_right);
5164 tv_mask = tarval_shl(get_mode_all_one(mode), tv_shl);
5165 tv_mask = tarval_shr(tv_mask, tv_shr);
5170 assert(get_tarval_mode(tv_shl) == get_tarval_mode(tv_shr));
5171 assert(tv_mask != tarval_bad);
5172 assert(get_tarval_mode(tv_mask) == mode);
5174 irg = get_irn_irg(n);
5175 block = get_nodes_block(n);
5176 dbgi = get_irn_dbg_info(n);
5178 pnc = tarval_cmp(tv_shl, tv_shr);
5179 if (pnc == pn_Cmp_Lt || pnc == pn_Cmp_Eq) {
5180 tv_shift = tarval_sub(tv_shr, tv_shl, NULL);
5181 new_const = new_Const(get_tarval_mode(tv_shift), tv_shift);
5183 new_shift = new_rd_Shrs(dbgi, irg, block, x, new_const, mode);
5185 new_shift = new_rd_Shr(dbgi, irg, block, x, new_const, mode);
5188 assert(pnc == pn_Cmp_Gt);
5189 tv_shift = tarval_sub(tv_shl, tv_shr, NULL);
5190 new_const = new_Const(get_tarval_mode(tv_shift), tv_shift);
5191 new_shift = new_rd_Shl(dbgi, irg, block, x, new_const, mode);
5194 new_const = new_Const(mode, tv_mask);
5195 new_and = new_rd_And(dbgi, irg, block, new_shift, new_const, mode);
5203 static ir_node *transform_node_Shr(ir_node *n) {
5204 ir_node *c, *oldn = n;
5205 ir_node *left = get_Shr_left(n);
5206 ir_node *right = get_Shr_right(n);
5207 ir_mode *mode = get_irn_mode(n);
5209 HANDLE_BINOP_PHI(tarval_shr, left, right, c, mode);
5210 n = transform_node_shift(n);
5213 n = transform_node_shl_shr(n);
5215 n = transform_node_bitop_shift(n);
5218 } /* transform_node_Shr */
5223 static ir_node *transform_node_Shrs(ir_node *n) {
5224 ir_node *c, *oldn = n;
5225 ir_node *a = get_Shrs_left(n);
5226 ir_node *b = get_Shrs_right(n);
5227 ir_mode *mode = get_irn_mode(n);
5229 HANDLE_BINOP_PHI(tarval_shrs, a, b, c, mode);
5230 n = transform_node_shift(n);
5233 n = transform_node_bitop_shift(n);
5236 } /* transform_node_Shrs */
5241 static ir_node *transform_node_Shl(ir_node *n) {
5242 ir_node *c, *oldn = n;
5243 ir_node *a = get_Shl_left(n);
5244 ir_node *b = get_Shl_right(n);
5245 ir_mode *mode = get_irn_mode(n);
5247 HANDLE_BINOP_PHI(tarval_shl, a, b, c, mode);
5248 n = transform_node_shift(n);
5251 n = transform_node_shl_shr(n);
5253 n = transform_node_bitop_shift(n);
5256 } /* transform_node_Shl */
5261 static ir_node *transform_node_Rotl(ir_node *n) {
5262 ir_node *c, *oldn = n;
5263 ir_node *a = get_Rotl_left(n);
5264 ir_node *b = get_Rotl_right(n);
5265 ir_mode *mode = get_irn_mode(n);
5267 HANDLE_BINOP_PHI(tarval_rotl, a, b, c, mode);
5268 n = transform_node_shift(n);
5271 n = transform_node_bitop_shift(n);
5274 } /* transform_node_Rotl */
5279 static ir_node *transform_node_Conv(ir_node *n) {
5280 ir_node *c, *oldn = n;
5281 ir_node *a = get_Conv_op(n);
5283 if (is_const_Phi(a)) {
5284 c = apply_conv_on_phi(a, get_irn_mode(n));
5286 DBG_OPT_ALGSIM0(oldn, c, FS_OPT_CONST_PHI);
5291 if (is_Unknown(a)) { /* Conv_A(Unknown_B) -> Unknown_A */
5292 ir_mode *mode = get_irn_mode(n);
5293 return new_r_Unknown(current_ir_graph, mode);
5297 } /* transform_node_Conv */
5300 * Remove dead blocks and nodes in dead blocks
5301 * in keep alive list. We do not generate a new End node.
5303 static ir_node *transform_node_End(ir_node *n) {
5304 int i, j, n_keepalives = get_End_n_keepalives(n);
5307 NEW_ARR_A(ir_node *, in, n_keepalives);
5309 for (i = j = 0; i < n_keepalives; ++i) {
5310 ir_node *ka = get_End_keepalive(n, i);
5312 if (! is_Block_dead(ka)) {
5316 } else if (is_irn_pinned_in_irg(ka) && is_Block_dead(get_nodes_block(ka))) {
5321 if (j != n_keepalives)
5322 set_End_keepalives(n, j, in);
5324 } /* transform_node_End */
5326 /** returns 1 if a == -b */
5327 static int is_negated_value(ir_node *a, ir_node *b) {
5328 if (is_Minus(a) && get_Minus_op(a) == b)
5330 if (is_Minus(b) && get_Minus_op(b) == a)
5332 if (is_Sub(a) && is_Sub(b)) {
5333 ir_node *a_left = get_Sub_left(a);
5334 ir_node *a_right = get_Sub_right(a);
5335 ir_node *b_left = get_Sub_left(b);
5336 ir_node *b_right = get_Sub_right(b);
5338 if (a_left == b_right && a_right == b_left)
5346 * Optimize a Mux into some simpler cases.
5348 static ir_node *transform_node_Mux(ir_node *n) {
5349 ir_node *oldn = n, *sel = get_Mux_sel(n);
5350 ir_mode *mode = get_irn_mode(n);
5351 ir_node *t = get_Mux_true(n);
5352 ir_node *f = get_Mux_false(n);
5353 ir_graph *irg = current_ir_graph;
5355 /* first normalization step: move a possible zero to the false case */
5357 ir_node *cmp = get_Proj_pred(sel);
5360 if (is_Const(t) && is_Const_null(t)) {
5363 /* Mux(x, 0, y) => Mux(x, y, 0) */
5364 pn_Cmp pnc = get_Proj_proj(sel);
5365 sel = new_r_Proj(irg, get_nodes_block(cmp), cmp, mode_b,
5366 get_negated_pnc(pnc, get_irn_mode(get_Cmp_left(cmp))));
5367 n = new_rd_Mux(get_irn_dbg_info(n), irg, get_nodes_block(n), sel, t, f, mode);
5375 /* note: after normalization, false can only happen on default */
5376 if (mode == mode_b) {
5377 dbg_info *dbg = get_irn_dbg_info(n);
5378 ir_node *block = get_nodes_block(n);
5379 ir_graph *irg = current_ir_graph;
5382 tarval *tv_t = get_Const_tarval(t);
5383 if (tv_t == tarval_b_true) {
5385 /* Muxb(sel, true, false) = sel */
5386 assert(get_Const_tarval(f) == tarval_b_false);
5387 DBG_OPT_ALGSIM0(oldn, sel, FS_OPT_MUX_BOOL);
5390 /* Muxb(sel, true, x) = Or(sel, x) */
5391 n = new_rd_Or(dbg, irg, block, sel, f, mode_b);
5392 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_OR_BOOL);
5396 } else if (is_Const(f)) {
5397 tarval *tv_f = get_Const_tarval(f);
5398 if (tv_f == tarval_b_true) {
5399 /* Muxb(sel, x, true) = Or(Not(sel), x) */
5400 ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
5401 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_ORNOT_BOOL);
5402 n = new_rd_Or(dbg, irg, block, not_sel, t, mode_b);
5405 /* Muxb(sel, x, false) = And(sel, x) */
5406 assert(tv_f == tarval_b_false);
5407 n = new_rd_And(dbg, irg, block, sel, t, mode_b);
5408 DBG_OPT_ALGSIM0(oldn, n, FS_OPT_MUX_AND_BOOL);
5414 /* more normalization: try to normalize Mux(x, C1, C2) into Mux(x, +1/-1, 0) op C2 */
5415 if (is_Const(t) && is_Const(f) && mode_is_int(mode)) {
5416 tarval *a = get_Const_tarval(t);
5417 tarval *b = get_Const_tarval(f);
5418 tarval *null = get_tarval_null(mode);
5421 if (tarval_cmp(a, b) & pn_Cmp_Gt) {
5422 diff = tarval_sub(a, b, NULL);
5425 diff = tarval_sub(b, a, NULL);
5429 if (diff == get_tarval_one(mode) && min != null) {
5430 dbg_info *dbg = get_irn_dbg_info(n);
5431 ir_node *block = get_nodes_block(n);
5432 ir_graph *irg = current_ir_graph;
5433 ir_node *t = new_Const(mode, tarval_sub(a, min, NULL));
5434 ir_node *f = new_Const(mode, tarval_sub(b, min, NULL));
5435 n = new_rd_Mux(dbg, irg, block, sel, f, t, mode);
5436 n = new_rd_Add(dbg, irg, block, n, new_Const(mode, min), mode);
5442 ir_node *cmp = get_Proj_pred(sel);
5443 long pn = get_Proj_proj(sel);
5446 * Note: normalization puts the constant on the right side,
5447 * so we check only one case.
5449 * Note further that these optimization work even for floating point
5450 * with NaN's because -NaN == NaN.
5451 * However, if +0 and -0 is handled differently, we cannot use the Abs/-Abs
5455 ir_node *cmp_r = get_Cmp_right(cmp);
5456 if (is_Const(cmp_r) && is_Const_null(cmp_r)) {
5457 ir_node *block = get_nodes_block(n);
5458 ir_node *cmp_l = get_Cmp_left(cmp);
5460 if (!mode_honor_signed_zeros(mode) && is_negated_value(f, t)) {
5463 if ( (cmp_l == t && (pn == pn_Cmp_Ge || pn == pn_Cmp_Gt))
5464 || (cmp_l == f && (pn == pn_Cmp_Le || pn == pn_Cmp_Lt)))
5466 /* Mux(a >/>= 0, a, -a) = Mux(a </<= 0, -a, a) ==> Abs(a) */
5467 n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph, block,
5469 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
5471 } else if ((cmp_l == t && (pn == pn_Cmp_Le || pn == pn_Cmp_Lt))
5472 || (cmp_l == f && (pn == pn_Cmp_Ge || pn == pn_Cmp_Gt)))
5474 /* Mux(a </<= 0, a, -a) = Mux(a >/>= 0, -a, a) ==> -Abs(a) */
5475 n = new_rd_Abs(get_irn_dbg_info(n), current_ir_graph, block,
5477 n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph,
5479 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_ABS);
5484 if (mode_is_int(mode)) {
5486 if ((pn == pn_Cmp_Lg || pn == pn_Cmp_Eq) && is_And(cmp_l)) {
5487 /* Mux((a & b) != 0, c, 0) */
5488 ir_node *and_r = get_And_right(cmp_l);
5491 if (and_r == t && f == cmp_r) {
5492 if (is_Const(t) && tarval_is_single_bit(get_Const_tarval(t))) {
5493 if (pn == pn_Cmp_Lg) {
5494 /* Mux((a & 2^C) != 0, 2^C, 0) */
5496 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5498 /* Mux((a & 2^C) == 0, 2^C, 0) */
5499 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
5500 block, cmp_l, t, mode);
5501 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5506 if (is_Shl(and_r)) {
5507 ir_node *shl_l = get_Shl_left(and_r);
5508 if (is_Const(shl_l) && is_Const_one(shl_l)) {
5509 if (and_r == t && f == cmp_r) {
5510 if (pn == pn_Cmp_Lg) {
5511 /* (a & (1 << n)) != 0, (1 << n), 0) */
5513 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5515 /* (a & (1 << n)) == 0, (1 << n), 0) */
5516 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
5517 block, cmp_l, t, mode);
5518 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5524 and_l = get_And_left(cmp_l);
5525 if (is_Shl(and_l)) {
5526 ir_node *shl_l = get_Shl_left(and_l);
5527 if (is_Const(shl_l) && is_Const_one(shl_l)) {
5528 if (and_l == t && f == cmp_r) {
5529 if (pn == pn_Cmp_Lg) {
5530 /* ((1 << n) & a) != 0, (1 << n), 0) */
5532 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5534 /* ((1 << n) & a) == 0, (1 << n), 0) */
5535 n = new_rd_Eor(get_irn_dbg_info(n), current_ir_graph,
5536 block, cmp_l, t, mode);
5537 DBG_OPT_ALGSIM1(oldn, cmp, sel, n, FS_OPT_MUX_TO_BITOP);
5548 return arch_transform_node_Mux(n);
5549 } /* transform_node_Mux */
5552 * optimize Sync nodes that have other syncs as input we simply add the inputs
5553 * of the other sync to our own inputs
5555 static ir_node *transform_node_Sync(ir_node *n) {
5556 int arity = get_Sync_n_preds(n);
5559 for (i = 0; i < arity;) {
5560 ir_node *pred = get_Sync_pred(n, i);
5564 if (!is_Sync(pred)) {
5572 pred_arity = get_Sync_n_preds(pred);
5573 for (j = 0; j < pred_arity; ++j) {
5574 ir_node *pred_pred = get_Sync_pred(pred, j);
5579 add_irn_n(n, pred_pred);
5583 if (get_Sync_pred(n, k) == pred_pred) break;
5588 /* rehash the sync node */
5589 add_identities(current_ir_graph->value_table, n);
5595 * Tries several [inplace] [optimizing] transformations and returns an
5596 * equivalent node. The difference to equivalent_node() is that these
5597 * transformations _do_ generate new nodes, and thus the old node must
5598 * not be freed even if the equivalent node isn't the old one.
5600 static ir_node *transform_node(ir_node *n) {
5604 * Transform_node is the only "optimizing transformation" that might
5605 * return a node with a different opcode. We iterate HERE until fixpoint
5606 * to get the final result.
5610 if (n->op->ops.transform_node)
5611 n = n->op->ops.transform_node(n);
5612 } while (oldn != n);
5615 } /* transform_node */
5618 * Sets the default transform node operation for an ir_op_ops.
5620 * @param code the opcode for the default operation
5621 * @param ops the operations initialized
5626 static ir_op_ops *firm_set_default_transform_node(ir_opcode code, ir_op_ops *ops)
5630 ops->transform_node = transform_node_##a; \
5632 #define CASE_PROJ(a) \
5634 ops->transform_node_Proj = transform_node_Proj_##a; \
5636 #define CASE_PROJ_EX(a) \
5638 ops->transform_node = transform_node_##a; \
5639 ops->transform_node_Proj = transform_node_Proj_##a; \
5648 CASE_PROJ_EX(DivMod);
5682 } /* firm_set_default_transform_node */
5685 /* **************** Common Subexpression Elimination **************** */
5687 /** The size of the hash table used, should estimate the number of nodes
5689 #define N_IR_NODES 512
5691 /** Compares the attributes of two Const nodes. */
5692 static int node_cmp_attr_Const(ir_node *a, ir_node *b) {
5693 return (get_Const_tarval(a) != get_Const_tarval(b))
5694 || (get_Const_type(a) != get_Const_type(b));
5695 } /* node_cmp_attr_Const */
5697 /** Compares the attributes of two Proj nodes. */
5698 static int node_cmp_attr_Proj(ir_node *a, ir_node *b) {
5699 return get_irn_proj_attr(a) != get_irn_proj_attr(b);
5700 } /* node_cmp_attr_Proj */
5702 /** Compares the attributes of two Filter nodes. */
5703 static int node_cmp_attr_Filter(ir_node *a, ir_node *b) {
5704 return get_Filter_proj(a) != get_Filter_proj(b);
5705 } /* node_cmp_attr_Filter */
5707 /** Compares the attributes of two Alloc nodes. */
5708 static int node_cmp_attr_Alloc(ir_node *a, ir_node *b) {
5709 const alloc_attr *pa = get_irn_alloc_attr(a);
5710 const alloc_attr *pb = get_irn_alloc_attr(b);
5711 return (pa->where != pb->where) || (pa->type != pb->type);
5712 } /* node_cmp_attr_Alloc */
5714 /** Compares the attributes of two Free nodes. */
5715 static int node_cmp_attr_Free(ir_node *a, ir_node *b) {
5716 const free_attr *pa = get_irn_free_attr(a);
5717 const free_attr *pb = get_irn_free_attr(b);
5718 return (pa->where != pb->where) || (pa->type != pb->type);
5719 } /* node_cmp_attr_Free */
5721 /** Compares the attributes of two SymConst nodes. */
5722 static int node_cmp_attr_SymConst(ir_node *a, ir_node *b) {
5723 const symconst_attr *pa = get_irn_symconst_attr(a);
5724 const symconst_attr *pb = get_irn_symconst_attr(b);
5725 return (pa->kind != pb->kind)
5726 || (pa->sym.type_p != pb->sym.type_p)
5727 || (pa->tp != pb->tp);
5728 } /* node_cmp_attr_SymConst */
5730 /** Compares the attributes of two Call nodes. */
5731 static int node_cmp_attr_Call(ir_node *a, ir_node *b) {
5732 return get_irn_call_attr(a) != get_irn_call_attr(b);
5733 } /* node_cmp_attr_Call */
5735 /** Compares the attributes of two Sel nodes. */
5736 static int node_cmp_attr_Sel(ir_node *a, ir_node *b) {
5737 const ir_entity *a_ent = get_Sel_entity(a);
5738 const ir_entity *b_ent = get_Sel_entity(b);
5741 (a_ent->kind != b_ent->kind) ||
5742 (a_ent->name != b_ent->name) ||
5743 (a_ent->owner != b_ent->owner) ||
5744 (a_ent->ld_name != b_ent->ld_name) ||
5745 (a_ent->type != b_ent->type);
5747 /* Matze: inlining of functions can produce 2 entities with same type,
5749 return a_ent != b_ent;
5750 } /* node_cmp_attr_Sel */
5752 /** Compares the attributes of two Phi nodes. */
5753 static int node_cmp_attr_Phi(ir_node *a, ir_node *b) {
5754 /* we can only enter this function if both nodes have the same number of inputs,
5755 hence it is enough to check if one of them is a Phi0 */
5757 /* check the Phi0 pos attribute */
5758 return get_irn_phi_attr(a)->u.pos != get_irn_phi_attr(b)->u.pos;
5761 } /* node_cmp_attr_Phi */
5763 /** Compares the attributes of two Conv nodes. */
5764 static int node_cmp_attr_Conv(ir_node *a, ir_node *b) {
5765 return get_Conv_strict(a) != get_Conv_strict(b);
5766 } /* node_cmp_attr_Conv */
5768 /** Compares the attributes of two Cast nodes. */
5769 static int node_cmp_attr_Cast(ir_node *a, ir_node *b) {
5770 return get_Cast_type(a) != get_Cast_type(b);
5771 } /* node_cmp_attr_Cast */
5773 /** Compares the attributes of two Load nodes. */
5774 static int node_cmp_attr_Load(ir_node *a, ir_node *b) {
5775 if (get_Load_volatility(a) == volatility_is_volatile ||
5776 get_Load_volatility(b) == volatility_is_volatile)
5777 /* NEVER do CSE on volatile Loads */
5779 /* do not CSE Loads with different alignment. Be conservative. */
5780 if (get_Load_align(a) != get_Load_align(b))
5783 return get_Load_mode(a) != get_Load_mode(b);
5784 } /* node_cmp_attr_Load */
5786 /** Compares the attributes of two Store nodes. */
5787 static int node_cmp_attr_Store(ir_node *a, ir_node *b) {
5788 /* do not CSE Stores with different alignment. Be conservative. */
5789 if (get_Store_align(a) != get_Store_align(b))
5792 /* NEVER do CSE on volatile Stores */
5793 return (get_Store_volatility(a) == volatility_is_volatile ||
5794 get_Store_volatility(b) == volatility_is_volatile);
5795 } /* node_cmp_attr_Store */
5797 /** Compares two exception attributes */
5798 static int node_cmp_exception(ir_node *a, ir_node *b) {
5799 const except_attr *ea = get_irn_except_attr(a);
5800 const except_attr *eb = get_irn_except_attr(b);
5802 return ea->pin_state != eb->pin_state;
5805 #define node_cmp_attr_Bound node_cmp_exception
5807 /** Compares the attributes of two Div nodes. */
5808 static int node_cmp_attr_Div(ir_node *a, ir_node *b) {
5809 const divmod_attr *ma = get_irn_divmod_attr(a);
5810 const divmod_attr *mb = get_irn_divmod_attr(b);
5811 return ma->exc.pin_state != mb->exc.pin_state ||
5812 ma->res_mode != mb->res_mode ||
5813 ma->no_remainder != mb->no_remainder;
5814 } /* node_cmp_attr_Div */
5816 /** Compares the attributes of two DivMod nodes. */
5817 static int node_cmp_attr_DivMod(ir_node *a, ir_node *b) {
5818 const divmod_attr *ma = get_irn_divmod_attr(a);
5819 const divmod_attr *mb = get_irn_divmod_attr(b);
5820 return ma->exc.pin_state != mb->exc.pin_state ||
5821 ma->res_mode != mb->res_mode;
5822 } /* node_cmp_attr_DivMod */
5824 /** Compares the attributes of two Mod nodes. */
5825 static int node_cmp_attr_Mod(ir_node *a, ir_node *b) {
5826 const divmod_attr *ma = get_irn_divmod_attr(a);
5827 const divmod_attr *mb = get_irn_divmod_attr(b);
5828 return ma->exc.pin_state != mb->exc.pin_state ||
5829 ma->res_mode != mb->res_mode;
5830 } /* node_cmp_attr_Mod */
5832 /** Compares the attributes of two Quot nodes. */
5833 static int node_cmp_attr_Quot(ir_node *a, ir_node *b) {
5834 const divmod_attr *ma = get_irn_divmod_attr(a);
5835 const divmod_attr *mb = get_irn_divmod_attr(b);
5836 return ma->exc.pin_state != mb->exc.pin_state ||
5837 ma->res_mode != mb->res_mode;
5838 } /* node_cmp_attr_Quot */
5840 /** Compares the attributes of two Confirm nodes. */
5841 static int node_cmp_attr_Confirm(ir_node *a, ir_node *b) {
5842 return (get_Confirm_cmp(a) != get_Confirm_cmp(b));
5843 } /* node_cmp_attr_Confirm */
5845 /** Compares the attributes of two ASM nodes. */
5846 static int node_cmp_attr_ASM(ir_node *a, ir_node *b) {
5848 const ir_asm_constraint *ca;
5849 const ir_asm_constraint *cb;
5852 if (get_ASM_text(a) != get_ASM_text(b))
5855 /* Should we really check the constraints here? Should be better, but is strange. */
5856 n = get_ASM_n_input_constraints(a);
5857 if (n != get_ASM_n_input_constraints(b))
5860 ca = get_ASM_input_constraints(a);
5861 cb = get_ASM_input_constraints(b);
5862 for (i = 0; i < n; ++i) {
5863 if (ca[i].pos != cb[i].pos || ca[i].constraint != cb[i].constraint)
5867 n = get_ASM_n_output_constraints(a);
5868 if (n != get_ASM_n_output_constraints(b))
5871 ca = get_ASM_output_constraints(a);
5872 cb = get_ASM_output_constraints(b);
5873 for (i = 0; i < n; ++i) {
5874 if (ca[i].pos != cb[i].pos || ca[i].constraint != cb[i].constraint)
5878 n = get_ASM_n_clobbers(a);
5879 if (n != get_ASM_n_clobbers(b))
5882 cla = get_ASM_clobbers(a);
5883 clb = get_ASM_clobbers(b);
5884 for (i = 0; i < n; ++i) {
5885 if (cla[i] != clb[i])
5889 } /* node_cmp_attr_ASM */
5892 * Set the default node attribute compare operation for an ir_op_ops.
5894 * @param code the opcode for the default operation
5895 * @param ops the operations initialized
5900 static ir_op_ops *firm_set_default_node_cmp_attr(ir_opcode code, ir_op_ops *ops)
5904 ops->node_cmp_attr = node_cmp_attr_##a; \
5935 } /* firm_set_default_node_cmp_attr */
5938 * Compare function for two nodes in the value table. Gets two
5939 * nodes as parameters. Returns 0 if the nodes are a Common Sub Expression.
5941 int identities_cmp(const void *elt, const void *key) {
5942 ir_node *a = (ir_node *)elt;
5943 ir_node *b = (ir_node *)key;
5946 if (a == b) return 0;
5948 if ((get_irn_op(a) != get_irn_op(b)) ||
5949 (get_irn_mode(a) != get_irn_mode(b))) return 1;
5951 /* compare if a's in and b's in are of equal length */
5952 irn_arity_a = get_irn_intra_arity(a);
5953 if (irn_arity_a != get_irn_intra_arity(b))
5956 if (get_irn_pinned(a) == op_pin_state_pinned) {
5957 /* for pinned nodes, the block inputs must be equal */
5958 if (get_irn_intra_n(a, -1) != get_irn_intra_n(b, -1))
5960 } else if (! get_opt_global_cse()) {
5961 /* for block-local CSE both nodes must be in the same MacroBlock */
5962 if (get_irn_MacroBlock(a) != get_irn_MacroBlock(b))
5966 /* compare a->in[0..ins] with b->in[0..ins] */
5967 for (i = 0; i < irn_arity_a; i++)
5968 if (get_irn_intra_n(a, i) != get_irn_intra_n(b, i))
5972 * here, we already now that the nodes are identical except their
5975 if (a->op->ops.node_cmp_attr)
5976 return a->op->ops.node_cmp_attr(a, b);
5979 } /* identities_cmp */
5982 * Calculate a hash value of a node.
5984 * @param node The IR-node
5986 unsigned ir_node_hash(const ir_node *node) {
5987 return node->op->ops.hash(node);
5988 } /* ir_node_hash */
5991 pset *new_identities(void) {
5992 return new_pset(identities_cmp, N_IR_NODES);
5993 } /* new_identities */
5995 void del_identities(pset *value_table) {
5996 del_pset(value_table);
5997 } /* del_identities */
6000 * Normalize a node by putting constants (and operands with larger
6001 * node index) on the right (operator side).
6003 * @param n The node to normalize
6005 static void normalize_node(ir_node *n) {
6006 if (is_op_commutative(get_irn_op(n))) {
6007 ir_node *l = get_binop_left(n);
6008 ir_node *r = get_binop_right(n);
6010 /* For commutative operators perform a OP b == b OP a but keep
6011 * constants on the RIGHT side. This helps greatly in some
6012 * optimizations. Moreover we use the idx number to make the form
6014 if (!operands_are_normalized(l, r)) {
6015 set_binop_left(n, r);
6016 set_binop_right(n, l);
6019 } /* normalize_node */
6022 * Update the nodes after a match in the value table. If both nodes have
6023 * the same MacroBlock but different Blocks, we must ensure that the node
6024 * with the dominating Block (the node that is near to the MacroBlock header
6025 * is stored in the table.
6026 * Because a MacroBlock has only one "non-exception" flow, we don't need
6027 * dominance info here: We known, that one block must dominate the other and
6028 * following the only block input will allow to find it.
6030 static void update_known_irn(ir_node *known_irn, const ir_node *new_ir_node) {
6031 ir_node *known_blk, *new_block, *block, *mbh;
6033 if (get_opt_global_cse()) {
6034 /* Block inputs are meaning less */
6037 known_blk = get_irn_n(known_irn, -1);
6038 new_block = get_irn_n(new_ir_node, -1);
6039 if (known_blk == new_block) {
6040 /* already in the same block */
6044 * We expect the typical case when we built the graph. In that case, the
6045 * known_irn is already the upper one, so checking this should be faster.
6048 mbh = get_Block_MacroBlock(new_block);
6050 if (block == known_blk) {
6051 /* ok, we have found it: known_block dominates new_block as expected */
6056 * We have reached the MacroBlock header NOT founding
6057 * the known_block. new_block must dominate known_block.
6060 set_irn_n(known_irn, -1, new_block);
6063 assert(get_Block_n_cfgpreds(block) == 1);
6064 block = get_Block_cfgpred_block(block, 0);
6066 } /* update_value_table */
6069 * Return the canonical node computing the same value as n.
6070 * Looks up the node in a hash table, enters it in the table
6071 * if it isn't there yet.
6073 * @param value_table the HashSet containing all nodes in the
6075 * @param n the node to look up
6077 * @return a node that computes the same value as n or n if no such
6078 * node could be found
6080 ir_node *identify_remember(pset *value_table, ir_node *n) {
6083 if (!value_table) return n;
6086 /* lookup or insert in hash table with given hash key. */
6087 o = pset_insert(value_table, n, ir_node_hash(n));
6090 update_known_irn(o, n);
6094 } /* identify_remember */
6097 * During construction we set the op_pin_state_pinned flag in the graph right when the
6098 * optimization is performed. The flag turning on procedure global cse could
6099 * be changed between two allocations. This way we are safe.
6101 * @param value_table The value table
6102 * @param n The node to lookup
6104 static INLINE ir_node *identify_cons(pset *value_table, ir_node *n) {
6107 n = identify_remember(value_table, n);
6108 if (n != old && get_irn_MacroBlock(old) != get_irn_MacroBlock(n))
6109 set_irg_pinned(current_ir_graph, op_pin_state_floats);
6111 } /* identify_cons */
6113 /* Add a node to the identities value table. */
6114 void add_identities(pset *value_table, ir_node *node) {
6115 if (get_opt_cse() && is_no_Block(node))
6116 identify_remember(value_table, node);
6117 } /* add_identities */
6119 /* Visit each node in the value table of a graph. */
6120 void visit_all_identities(ir_graph *irg, irg_walk_func visit, void *env) {
6122 ir_graph *rem = current_ir_graph;
6124 current_ir_graph = irg;
6125 foreach_pset(irg->value_table, node)
6127 current_ir_graph = rem;
6128 } /* visit_all_identities */
6131 * Garbage in, garbage out. If a node has a dead input, i.e., the
6132 * Bad node is input to the node, return the Bad node.
6134 static ir_node *gigo(ir_node *node) {
6136 ir_op *op = get_irn_op(node);
6138 /* remove garbage blocks by looking at control flow that leaves the block
6139 and replacing the control flow by Bad. */
6140 if (get_irn_mode(node) == mode_X) {
6141 ir_node *block = get_nodes_block(skip_Proj(node));
6143 /* Don't optimize nodes in immature blocks. */
6144 if (!get_Block_matured(block))
6146 /* Don't optimize End, may have Bads. */
6147 if (op == op_End) return node;
6149 if (is_Block(block)) {
6150 if (is_Block_dead(block)) {
6151 /* control flow from dead block is dead */
6155 for (i = get_irn_arity(block) - 1; i >= 0; --i) {
6156 if (!is_Bad(get_irn_n(block, i)))
6160 ir_graph *irg = get_irn_irg(block);
6161 /* the start block is never dead */
6162 if (block != get_irg_start_block(irg)
6163 && block != get_irg_end_block(irg)) {
6165 * Do NOT kill control flow without setting
6166 * the block to dead of bad things can happen:
6167 * We get a Block that is not reachable be irg_block_walk()
6168 * but can be found by irg_walk()!
6170 set_Block_dead(block);
6177 /* Blocks, Phis and Tuples may have dead inputs, e.g., if one of the
6178 blocks predecessors is dead. */
6179 if (op != op_Block && op != op_Phi && op != op_Tuple) {
6180 irn_arity = get_irn_arity(node);
6183 * Beware: we can only read the block of a non-floating node.
6185 if (is_irn_pinned_in_irg(node) &&
6186 is_Block_dead(get_nodes_block(skip_Proj(node))))
6189 for (i = 0; i < irn_arity; i++) {
6190 ir_node *pred = get_irn_n(node, i);
6195 /* Propagating Unknowns here seems to be a bad idea, because
6196 sometimes we need a node as a input and did not want that
6198 However, it might be useful to move this into a later phase
6199 (if you think that optimizing such code is useful). */
6200 if (is_Unknown(pred) && mode_is_data(get_irn_mode(node)))
6201 return new_Unknown(get_irn_mode(node));
6206 /* With this code we violate the agreement that local_optimize
6207 only leaves Bads in Block, Phi and Tuple nodes. */
6208 /* If Block has only Bads as predecessors it's garbage. */
6209 /* If Phi has only Bads as predecessors it's garbage. */
6210 if ((op == op_Block && get_Block_matured(node)) || op == op_Phi) {
6211 irn_arity = get_irn_arity(node);
6212 for (i = 0; i < irn_arity; i++) {
6213 if (!is_Bad(get_irn_n(node, i))) break;
6215 if (i == irn_arity) node = new_Bad();
6222 * These optimizations deallocate nodes from the obstack.
6223 * It can only be called if it is guaranteed that no other nodes
6224 * reference this one, i.e., right after construction of a node.
6226 * @param n The node to optimize
6228 * current_ir_graph must be set to the graph of the node!
6230 ir_node *optimize_node(ir_node *n) {
6233 ir_opcode iro = get_irn_opcode(n);
6235 /* Always optimize Phi nodes: part of the construction. */
6236 if ((!get_opt_optimize()) && (iro != iro_Phi)) return n;
6238 /* constant expression evaluation / constant folding */
6239 if (get_opt_constant_folding()) {
6240 /* neither constants nor Tuple values can be evaluated */
6241 if (iro != iro_Const && (get_irn_mode(n) != mode_T)) {
6242 unsigned fp_model = get_irg_fp_model(current_ir_graph);
6243 int old_fp_mode = tarval_enable_fp_ops((fp_model & fp_strict_algebraic) == 0);
6244 /* try to evaluate */
6245 tv = computed_value(n);
6246 if (tv != tarval_bad) {
6248 ir_type *old_tp = get_irn_type(n);
6249 int i, arity = get_irn_arity(n);
6253 * Try to recover the type of the new expression.
6255 for (i = 0; i < arity && !old_tp; ++i)
6256 old_tp = get_irn_type(get_irn_n(n, i));
6259 * we MUST copy the node here temporary, because it's still needed
6260 * for DBG_OPT_CSTEVAL
6262 node_size = offsetof(ir_node, attr) + n->op->attr_size;
6263 oldn = alloca(node_size);
6265 memcpy(oldn, n, node_size);
6266 CLONE_ARR_A(ir_node *, oldn->in, n->in);
6268 /* ARG, copy the in array, we need it for statistics */
6269 memcpy(oldn->in, n->in, ARR_LEN(n->in) * sizeof(n->in[0]));
6271 /* note the inplace edges module */
6272 edges_node_deleted(n, current_ir_graph);
6274 /* evaluation was successful -- replace the node. */
6275 irg_kill_node(current_ir_graph, n);
6276 nw = new_Const(get_tarval_mode(tv), tv);
6278 if (old_tp && get_type_mode(old_tp) == get_tarval_mode(tv))
6279 set_Const_type(nw, old_tp);
6280 DBG_OPT_CSTEVAL(oldn, nw);
6281 tarval_enable_fp_ops(old_fp_mode);
6284 tarval_enable_fp_ops(old_fp_mode);
6288 /* remove unnecessary nodes */
6289 if (get_opt_algebraic_simplification() ||
6290 (iro == iro_Phi) || /* always optimize these nodes. */
6292 (iro == iro_Proj) ||
6293 (iro == iro_Block) ) /* Flags tested local. */
6294 n = equivalent_node(n);
6296 /* Common Subexpression Elimination.
6298 * Checks whether n is already available.
6299 * The block input is used to distinguish different subexpressions. Right
6300 * now all nodes are op_pin_state_pinned to blocks, i.e., the CSE only finds common
6301 * subexpressions within a block.
6304 n = identify_cons(current_ir_graph->value_table, n);
6307 edges_node_deleted(oldn, current_ir_graph);
6309 /* We found an existing, better node, so we can deallocate the old node. */
6310 irg_kill_node(current_ir_graph, oldn);
6314 /* Some more constant expression evaluation that does not allow to
6316 iro = get_irn_opcode(n);
6317 if (get_opt_algebraic_simplification() ||
6318 (iro == iro_Cond) ||
6319 (iro == iro_Proj)) /* Flags tested local. */
6320 n = transform_node(n);
6322 /* Remove nodes with dead (Bad) input.
6323 Run always for transformation induced Bads. */
6326 /* Now we have a legal, useful node. Enter it in hash table for CSE */
6327 if (get_opt_cse() && (get_irn_opcode(n) != iro_Block)) {
6329 n = identify_remember(current_ir_graph->value_table, o);
6335 } /* optimize_node */
6339 * These optimizations never deallocate nodes (in place). This can cause dead
6340 * nodes lying on the obstack. Remove these by a dead node elimination,
6341 * i.e., a copying garbage collection.
6343 ir_node *optimize_in_place_2(ir_node *n) {
6346 ir_opcode iro = get_irn_opcode(n);
6348 if (!get_opt_optimize() && !is_Phi(n)) return n;
6350 /* constant expression evaluation / constant folding */
6351 if (get_opt_constant_folding()) {
6352 /* neither constants nor Tuple values can be evaluated */
6353 if (iro != iro_Const && get_irn_mode(n) != mode_T) {
6354 unsigned fp_model = get_irg_fp_model(current_ir_graph);
6355 int old_fp_mode = tarval_enable_fp_ops((fp_model & fp_strict_algebraic) == 0);
6356 /* try to evaluate */
6357 tv = computed_value(n);
6358 if (tv != tarval_bad) {
6359 /* evaluation was successful -- replace the node. */
6360 ir_type *old_tp = get_irn_type(n);
6361 int i, arity = get_irn_arity(n);
6364 * Try to recover the type of the new expression.
6366 for (i = 0; i < arity && !old_tp; ++i)
6367 old_tp = get_irn_type(get_irn_n(n, i));
6369 n = new_Const(get_tarval_mode(tv), tv);
6371 if (old_tp && get_type_mode(old_tp) == get_tarval_mode(tv))
6372 set_Const_type(n, old_tp);
6374 DBG_OPT_CSTEVAL(oldn, n);
6375 tarval_enable_fp_ops(old_fp_mode);
6378 tarval_enable_fp_ops(old_fp_mode);
6382 /* remove unnecessary nodes */
6383 if (get_opt_constant_folding() ||
6384 (iro == iro_Phi) || /* always optimize these nodes. */
6385 (iro == iro_Id) || /* ... */
6386 (iro == iro_Proj) || /* ... */
6387 (iro == iro_Block) ) /* Flags tested local. */
6388 n = equivalent_node(n);
6390 /** common subexpression elimination **/
6391 /* Checks whether n is already available. */
6392 /* The block input is used to distinguish different subexpressions. Right
6393 now all nodes are op_pin_state_pinned to blocks, i.e., the cse only finds common
6394 subexpressions within a block. */
6395 if (get_opt_cse()) {
6397 n = identify_remember(current_ir_graph->value_table, o);
6402 /* Some more constant expression evaluation. */
6403 iro = get_irn_opcode(n);
6404 if (get_opt_constant_folding() ||
6405 (iro == iro_Cond) ||
6406 (iro == iro_Proj)) /* Flags tested local. */
6407 n = transform_node(n);
6409 /* Remove nodes with dead (Bad) input.
6410 Run always for transformation induced Bads. */
6413 /* Now we can verify the node, as it has no dead inputs any more. */
6416 /* Now we have a legal, useful node. Enter it in hash table for cse.
6417 Blocks should be unique anyways. (Except the successor of start:
6418 is cse with the start block!) */
6419 if (get_opt_cse() && (get_irn_opcode(n) != iro_Block)) {
6421 n = identify_remember(current_ir_graph->value_table, o);
6427 } /* optimize_in_place_2 */
6430 * Wrapper for external use, set proper status bits after optimization.
6432 ir_node *optimize_in_place(ir_node *n) {
6433 /* Handle graph state */
6434 assert(get_irg_phase_state(current_ir_graph) != phase_building);
6436 if (get_opt_global_cse())
6437 set_irg_pinned(current_ir_graph, op_pin_state_floats);
6438 if (get_irg_outs_state(current_ir_graph) == outs_consistent)
6439 set_irg_outs_inconsistent(current_ir_graph);
6441 /* FIXME: Maybe we could also test whether optimizing the node can
6442 change the control graph. */
6443 set_irg_doms_inconsistent(current_ir_graph);
6444 return optimize_in_place_2(n);
6445 } /* optimize_in_place */
6448 * Calculate a hash value of a Const node.
6450 static unsigned hash_Const(const ir_node *node) {
6453 /* special value for const, as they only differ in their tarval. */
6454 h = HASH_PTR(node->attr.con.tv);
6455 h = 9*h + HASH_PTR(get_irn_mode(node));
6461 * Calculate a hash value of a SymConst node.
6463 static unsigned hash_SymConst(const ir_node *node) {
6466 /* special value for const, as they only differ in their symbol. */
6467 h = HASH_PTR(node->attr.symc.sym.type_p);
6468 h = 9*h + HASH_PTR(get_irn_mode(node));
6471 } /* hash_SymConst */
6474 * Set the default hash operation in an ir_op_ops.
6476 * @param code the opcode for the default operation
6477 * @param ops the operations initialized
6482 static ir_op_ops *firm_set_default_hash(ir_opcode code, ir_op_ops *ops)
6486 ops->hash = hash_##a; \
6489 /* hash function already set */
6490 if (ops->hash != NULL)
6497 /* use input/mode default hash if no function was given */
6498 ops->hash = firm_default_hash;
6506 * Sets the default operation for an ir_ops.
6508 ir_op_ops *firm_set_default_operations(ir_opcode code, ir_op_ops *ops) {
6509 ops = firm_set_default_hash(code, ops);
6510 ops = firm_set_default_computed_value(code, ops);
6511 ops = firm_set_default_equivalent_node(code, ops);
6512 ops = firm_set_default_transform_node(code, ops);
6513 ops = firm_set_default_node_cmp_attr(code, ops);
6514 ops = firm_set_default_get_type(code, ops);
6515 ops = firm_set_default_get_type_attr(code, ops);
6516 ops = firm_set_default_get_entity_attr(code, ops);
6519 } /* firm_set_default_operations */