/** Optimize Not(Not(x)) == x. */
#define equivalent_node_Not equivalent_node_idempotent_unop
-/** --x == x ??? Is this possible or can --x raise an
+/** -(-x) == x ??? Is this possible or can --x raise an
out of bounds exception if min =! max? */
#define equivalent_node_Minus equivalent_node_idempotent_unop
ir_mode *a_mode = get_irn_mode(a);
if (n_mode == a_mode) { /* No Conv necessary */
- /* leave strict floating point Conv's */
- if (get_Conv_strict(n))
- return n;
+ if (get_Conv_strict(n)) {
+ /* special case: the predecessor might be a also a Conv */
+ if (is_Conv(a)) {
+ if (! get_Conv_strict(a)) {
+ /* first one is not strict, kick it */
+ set_Conv_op(n, get_Conv_op(a));
+ return n;
+ }
+ /* else both are strict conv, second is superflous */
+ } else {
+ /* leave strict floating point Conv's */
+ return n;
+ }
+ }
n = a;
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_CONV);
} else if (get_irn_op(a) == op_Conv) { /* Conv(Conv(b)) */
if (n_mode == mode_b) {
n = b; /* Convb(Conv*(xxxb(...))) == xxxb(...) */
DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
- } else if (mode_is_int(n_mode) || mode_is_character(n_mode)) {
+ } else if (mode_is_int(n_mode)) {
if (smaller_mode(b_mode, a_mode)){
n = b; /* ConvS(ConvL(xxxS(...))) == xxxS(...) */
DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_CONV);
/*
* One could expect that we simply return the previous
* Bound here. However, this would be wrong, as we could
- * add an exception Proj to a new location than.
- * So, we must turn in into a tuple
+ * add an exception Proj to a new location then.
+ * So, we must turn in into a tuple.
*/
ret_tuple = 1;
}
return n;
if (mode_is_num(mode)) {
- if (a == b) {
+ if (a == b && mode_is_int(mode)) {
ir_node *block = get_irn_n(n, -1);
n = new_rd_Mul(
DBG_OPT_ALGSIM0(oldn, n, FS_OPT_ADD_MUL_A_X_A);
}
}
+ /* Here we rely on constants be on the RIGHT side */
+ else if (get_mode_arithmetic(mode) == irma_twos_complement &&
+ is_Not(a) && classify_Const(b) == CNST_ONE) {
+ /* ~x + 1 = -x */
+ ir_node *op = get_Not_op(a);
+ ir_node *blk = get_irn_n(n, -1);
+ n = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, blk, op, mode);
+ DBG_OPT_ALGSIM0(oldn, n, FS_OPT_NOT_PLUS_1);
+ }
}
return n;
} /* transform_node_Add */
return n;
}
}
+ if (get_mode_arithmetic(mode) == irma_ieee754) {
+ if (is_Const(a)) {
+ tarval *tv = get_Const_tarval(a);
+ if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)) {
+ n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), b, b, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
+ return n;
+ }
+ }
+ else if (is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+ if (tarval_ieee754_get_exponent(tv) == 1 && tarval_ieee754_zero_mantissa(tv)) {
+ n = new_rd_Add(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), a, a, mode);
+ DBG_OPT_ALGSIM1(oldn, a, b, n, FS_OPT_ADD_A_A);
+ return n;
+ }
+ }
+ }
return arch_dep_replace_mul_with_shifts(n);
} /* transform_node_Mul */
*/
static ir_node *transform_node_Div(ir_node *n) {
tarval *tv = value_of(n);
+ ir_mode *mode = get_Div_resmode(n);
ir_node *value = n;
- /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
-
if (tv != tarval_bad) {
value = new_Const(get_tarval_mode(tv), tv);
DBG_OPT_CSTEVAL(n, value);
- } else /* Try architecture dependent optimization */
- value = arch_dep_replace_div_by_const(n);
+ goto make_tuple;
+ } else {
+ ir_node *a = get_Div_left(n);
+ ir_node *b = get_Div_right(n);
+ ir_node *dummy;
+
+ if (a == b && value_not_zero(a, &dummy)) {
+ /* BEWARE: we can optimize a/a to 1 only if this cannot cause a exception */
+ value = new_Const(mode, get_mode_one(mode));
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ } else {
+ if (mode_is_signed(mode) && is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+
+ if (tv == get_mode_minus_one(mode)) {
+ /* a / -1 */
+ value = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), a, mode);
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ }
+ }
+ /* Try architecture dependent optimization */
+ value = arch_dep_replace_div_by_const(n);
+ }
+ }
if (value != n) {
+ ir_node *mem, *blk;
+
+make_tuple:
/* Turn Div into a tuple (mem, jmp, bad, value) */
- ir_node *mem = get_Div_mem(n);
- ir_node *blk = get_irn_n(n, -1);
+ mem = get_Div_mem(n);
+ blk = get_irn_n(n, -1);
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
turn_into_tuple(n, pn_Div_max);
set_Tuple_pred(n, pn_Div_M, mem);
set_Tuple_pred(n, pn_Div_X_regular, new_r_Jmp(current_ir_graph, blk));
*/
static ir_node *transform_node_Mod(ir_node *n) {
tarval *tv = value_of(n);
+ ir_mode *mode = get_Mod_resmode(n);
ir_node *value = n;
- /* BEWARE: it is NOT possible to optimize a%a to 0, as this may cause a exception */
-
if (tv != tarval_bad) {
value = new_Const(get_tarval_mode(tv), tv);
DBG_OPT_CSTEVAL(n, value);
- } else /* Try architecture dependent optimization */
- value = arch_dep_replace_mod_by_const(n);
+ goto make_tuple;
+ } else {
+ ir_node *a = get_Mod_left(n);
+ ir_node *b = get_Mod_right(n);
+ ir_node *dummy;
+
+ if (a == b && value_not_zero(a, &dummy)) {
+ /* BEWARE: we can optimize a%a to 0 only if this cannot cause a exception */
+ value = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ } else {
+ if (mode_is_signed(mode) && is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+
+ if (tv == get_mode_minus_one(mode)) {
+ /* a % -1 = 0 */
+ value = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, value);
+ goto make_tuple;
+ }
+ }
+ /* Try architecture dependent optimization */
+ value = arch_dep_replace_mod_by_const(n);
+ }
+ }
if (value != n) {
+ ir_node *mem, *blk;
+
+make_tuple:
/* Turn Mod into a tuple (mem, jmp, bad, value) */
- ir_node *mem = get_Mod_mem(n);
- ir_node *blk = get_irn_n(n, -1);
+ mem = get_Mod_mem(n);
+ blk = get_irn_n(n, -1);
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
turn_into_tuple(n, pn_Mod_max);
set_Tuple_pred(n, pn_Mod_M, mem);
set_Tuple_pred(n, pn_Mod_X_regular, new_r_Jmp(current_ir_graph, blk));
* Transform a DivMod node.
*/
static ir_node *transform_node_DivMod(ir_node *n) {
- int evaluated = 0;
-
+ ir_node *dummy;
ir_node *a = get_DivMod_left(n);
ir_node *b = get_DivMod_right(n);
- ir_mode *mode = get_irn_mode(a);
+ ir_mode *mode = get_DivMod_resmode(n);
tarval *ta = value_of(a);
tarval *tb = value_of(b);
-
- if (!(mode_is_int(mode) && mode_is_int(get_irn_mode(b))))
- return n;
-
- /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
+ int evaluated = 0;
if (tb != tarval_bad) {
if (tb == get_mode_one(get_tarval_mode(tb))) {
- b = new_Const (mode, get_mode_null(mode));
- evaluated = 1;
-
+ b = new_Const(mode, get_mode_null(mode));
DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
} else if (ta != tarval_bad) {
tarval *resa, *resb;
- resa = tarval_div (ta, tb);
+ resa = tarval_div(ta, tb);
if (resa == tarval_bad) return n; /* Causes exception!!! Model by replacing through
Jmp for X result!? */
- resb = tarval_mod (ta, tb);
+ resb = tarval_mod(ta, tb);
if (resb == tarval_bad) return n; /* Causes exception! */
- a = new_Const (mode, resa);
- b = new_Const (mode, resb);
- evaluated = 1;
-
+ a = new_Const(mode, resa);
+ b = new_Const(mode, resb);
+ DBG_OPT_CSTEVAL(n, a);
+ DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
+ } else if (mode_is_signed(mode) && tb == get_mode_minus_one(mode)) {
+ a = new_rd_Minus(get_irn_dbg_info(n), current_ir_graph, get_irn_n(n, -1), a, mode);
+ b = new_Const(mode, get_mode_null(mode));
DBG_OPT_CSTEVAL(n, a);
DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
} else { /* Try architecture dependent optimization */
arch_dep_replace_divmod_by_const(&a, &b, n);
evaluated = a != NULL;
}
- } else if (ta == get_mode_null(mode)) {
+ } else if (a == b) {
+ if (value_not_zero(a, &dummy)) {
+ /* a/a && a != 0 */
+ a = new_Const(mode, get_mode_one(mode));
+ b = new_Const(mode, get_mode_null(mode));
+ DBG_OPT_CSTEVAL(n, a);
+ DBG_OPT_CSTEVAL(n, b);
+ goto make_tuple;
+ } else {
+ /* BEWARE: it is NOT possible to optimize a/a to 1, as this may cause a exception */
+ return n;
+ }
+ } else if (ta == get_mode_null(mode) && value_not_zero(b, &dummy)) {
/* 0 / non-Const = 0 */
b = a;
- evaluated = 1;
+ goto make_tuple;
}
if (evaluated) { /* replace by tuple */
- ir_node *mem = get_DivMod_mem(n);
- ir_node *blk = get_irn_n(n, -1);
+ ir_node *mem, *blk;
+
+make_tuple:
+ mem = get_DivMod_mem(n);
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
+
+ blk = get_irn_n(n, -1);
turn_into_tuple(n, pn_DivMod_max);
set_Tuple_pred(n, pn_DivMod_M, mem);
set_Tuple_pred(n, pn_DivMod_X_regular, new_r_Jmp(current_ir_graph, blk));
return n;
} /* transform_node_DivMod */
+/**
+ * Optimize x / c to x * (1/c)
+ */
+static ir_node *transform_node_Quot(ir_node *n) {
+ ir_mode *mode = get_Quot_resmode(n);
+ ir_node *oldn = n;
+
+ if (get_mode_arithmetic(mode) == irma_ieee754) {
+ ir_node *b = get_Quot_right(n);
+
+ if (is_Const(b)) {
+ tarval *tv = get_Const_tarval(b);
+
+ tv = tarval_quo(get_mode_one(mode), tv);
+
+ /* Do the transformation if the result is either exact or we are not
+ using strict rules. */
+ if (tv != tarval_bad &&
+ (tarval_ieee754_get_exact() || (get_irg_fp_model(current_ir_graph) & fp_strict_algebraic) == 0)) {
+ ir_node *blk = get_irn_n(n, -1);
+ ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
+ ir_node *a = get_Quot_left(n);
+ ir_node *m = new_rd_Mul(get_irn_dbg_info(n), current_ir_graph, blk, a, c, mode);
+ ir_node *mem = get_Quot_mem(n);
+
+ /* skip a potential Pin */
+ if (is_Pin(mem))
+ mem = get_Pin_op(mem);
+ turn_into_tuple(n, pn_Quot_max);
+ set_Tuple_pred(n, pn_Quot_M, mem);
+ set_Tuple_pred(n, pn_Quot_X_regular, new_r_Jmp(current_ir_graph, blk));
+ set_Tuple_pred(n, pn_Quot_X_except, new_r_Bad(current_ir_graph));
+ set_Tuple_pred(n, pn_Quot_res, m);
+ DBG_OPT_ALGSIM1(oldn, a, b, m, FS_OPT_FP_INV_MUL);
+ }
+ }
+ }
+ return n;
+} /* transform_node_Quot */
+
/**
* Optimize Abs(x) into x if x is Confirmed >= 0
* Optimize Abs(x) into -x if x is Confirmed <= 0
static ir_node *transform_node_Minus(ir_node *n) {
ir_node *c, *oldn = n;
ir_node *a = get_Minus_op(n);
+ ir_mode *mode;
HANDLE_UNOP_PHI(tarval_neg,a,c);
- if (is_Not(a)) {
+ mode = get_irn_mode(a);
+ if (get_mode_arithmetic(mode) == irma_twos_complement && is_Not(a)) {
/* -(~x) = x + 1 */
ir_node *op = get_Not_op(a);
- ir_mode *mode = get_irn_mode(op);
tarval *tv = get_mode_one(mode);
ir_node *blk = get_irn_n(n, -1);
ir_node *c = new_r_Const(current_ir_graph, blk, mode, tv);
*/
if ((proj_nr == pn_Cmp_Eq || proj_nr == pn_Cmp_Lg) &&
(get_irn_op(left) == op_And)) {
- if (is_single_bit_tarval(tv)) {
+ if (tarval_is_single_bit(tv)) {
/* check for Constant's match. We have check hare the tarvals,
because our const might be changed */
ir_node *la = get_And_left(left);
* OR c2 ===> OR
* AND c1
* OR
+ *
+ *
+ * value c2 value c1
+ * AND c1 ===> OR if (c1 | c2) == 0x111..11
+ * OR
*/
static ir_node *transform_node_Or_bf_store(ir_node *or) {
ir_node *and, *c1;
tarval *tv1, *tv2, *tv3, *tv4, *tv, *n_tv4, *n_tv2;
- get_comm_Binop_Ops(or, &and, &c1);
- if ((get_irn_op(c1) != op_Const) || (get_irn_op(and) != op_And))
- return or;
+ while (1) {
+ get_comm_Binop_Ops(or, &and, &c1);
+ if (!is_Const(c1) || !is_And(and))
+ return or;
- get_comm_Binop_Ops(and, &or_l, &c2);
- if ((get_irn_op(c2) != op_Const) || (get_irn_op(or_l) != op_Or))
- return or;
+ get_comm_Binop_Ops(and, &or_l, &c2);
+ if (!is_Const(c2))
+ return or;
- get_comm_Binop_Ops(or_l, &and_l, &c3);
- if ((get_irn_op(c3) != op_Const) || (get_irn_op(and_l) != op_And))
- return or;
+ tv1 = get_Const_tarval(c1);
+ tv2 = get_Const_tarval(c2);
- get_comm_Binop_Ops(and_l, &value, &c4);
- if (get_irn_op(c4) != op_Const)
- return or;
+ tv = tarval_or(tv1, tv2);
+ if (classify_tarval(tv) == TV_CLASSIFY_ALL_ONE) {
+ /* the AND does NOT clear a bit with isn't set be the OR */
+ set_Or_left(or, or_l);
+ set_Or_right(or, c1);
- /* ok, found the pattern, check for conditions */
- assert(mode == get_irn_mode(and));
- assert(mode == get_irn_mode(or_l));
- assert(mode == get_irn_mode(and_l));
+ /* check for more */
+ continue;
+ }
- tv1 = get_Const_tarval(c1);
- tv2 = get_Const_tarval(c2);
- tv3 = get_Const_tarval(c3);
- tv4 = get_Const_tarval(c4);
+ if (!is_Or(or_l))
+ return or;
- tv = tarval_or(tv4, tv2);
- if (classify_tarval(tv) != TV_CLASSIFY_ALL_ONE) {
- /* have at least one 0 at the same bit position */
- return or;
- }
+ get_comm_Binop_Ops(or_l, &and_l, &c3);
+ if (!is_Const(c3) || !is_And(and_l))
+ return or;
- n_tv4 = tarval_not(tv4);
- if (tv3 != tarval_and(tv3, n_tv4)) {
- /* bit in the or_mask is outside the and_mask */
- return or;
- }
+ get_comm_Binop_Ops(and_l, &value, &c4);
+ if (!is_Const(c4))
+ return or;
- n_tv2 = tarval_not(tv2);
- if (tv1 != tarval_and(tv1, n_tv2)) {
- /* bit in the or_mask is outside the and_mask */
- return or;
- }
+ /* ok, found the pattern, check for conditions */
+ assert(mode == get_irn_mode(and));
+ assert(mode == get_irn_mode(or_l));
+ assert(mode == get_irn_mode(and_l));
- /* ok, all conditions met */
- block = get_irn_n(or, -1);
+ tv3 = get_Const_tarval(c3);
+ tv4 = get_Const_tarval(c4);
- new_and = new_r_And(current_ir_graph, block,
- value, new_r_Const(current_ir_graph, block, mode, tarval_and(tv4, tv2)), mode);
+ tv = tarval_or(tv4, tv2);
+ if (classify_tarval(tv) != TV_CLASSIFY_ALL_ONE) {
+ /* have at least one 0 at the same bit position */
+ return or;
+ }
+
+ n_tv4 = tarval_not(tv4);
+ if (tv3 != tarval_and(tv3, n_tv4)) {
+ /* bit in the or_mask is outside the and_mask */
+ return or;
+ }
- new_const = new_r_Const(current_ir_graph, block, mode, tarval_or(tv3, tv1));
+ n_tv2 = tarval_not(tv2);
+ if (tv1 != tarval_and(tv1, n_tv2)) {
+ /* bit in the or_mask is outside the and_mask */
+ return or;
+ }
+
+ /* ok, all conditions met */
+ block = get_irn_n(or, -1);
- set_Or_left(or, new_and);
- set_Or_right(or, new_const);
+ new_and = new_r_And(current_ir_graph, block,
+ value, new_r_Const(current_ir_graph, block, mode, tarval_and(tv4, tv2)), mode);
- /* check for more */
- return transform_node_Or_bf_store(or);
+ new_const = new_r_Const(current_ir_graph, block, mode, tarval_or(tv3, tv1));
+
+ set_Or_left(or, new_and);
+ set_Or_right(or, new_const);
+
+ /* check for more */
+ }
} /* transform_node_Or_bf_store */
/**
ir_node *oldn = n, *sel = get_Mux_sel(n);
ir_mode *mode = get_irn_mode(n);
+ if (mode == mode_b) {
+ ir_node *t = get_Mux_true(n);
+ ir_node *f = get_Mux_false(n);
+ dbg_info *dbg = get_irn_dbg_info(n);
+ ir_node *block = get_irn_n(n, -1);
+ ir_graph *irg = current_ir_graph;
+
+ if (is_Const(t)) {
+ tarval *tv_t = get_Const_tarval(t);
+ if (tv_t == tarval_b_true) {
+ if (is_Const(f)) {
+ assert(get_Const_tarval(f) == tarval_b_false);
+ return sel;
+ } else {
+ return new_rd_Or(dbg, irg, block, sel, f, mode_b);
+ }
+ } else {
+ ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
+ assert(tv_t == tarval_b_false);
+ if (is_Const(f)) {
+ assert(get_Const_tarval(f) == tarval_b_true);
+ return not_sel;
+ } else {
+ return new_rd_And(dbg, irg, block, not_sel, f, mode_b);
+ }
+ }
+ } else if (is_Const(f)) {
+ tarval *tv_f = get_Const_tarval(f);
+ if (tv_f == tarval_b_true) {
+ ir_node* not_sel = new_rd_Not(dbg, irg, block, sel, mode_b);
+ return new_rd_Or(dbg, irg, block, not_sel, t, mode_b);
+ } else {
+ assert(tv_f == tarval_b_false);
+ return new_rd_And(dbg, irg, block, sel, t, mode_b);
+ }
+ }
+ }
+
if (get_irn_op(sel) == op_Proj && !mode_honor_signed_zeros(mode)) {
ir_node *cmp = get_Proj_pred(sel);
long proj_nr = get_Proj_proj(sel);
* not be freed even if the equivalent node isn't the old one.
*/
static ir_node *transform_node(ir_node *n) {
- if (n->op->ops.transform_node)
- n = n->op->ops.transform_node(n);
+ ir_node *oldn;
+
+ /*
+ * Transform_node is the only "optimizing transformation" that might
+ * return a node with a different opcode. We iterate HERE until fixpoint
+ * to get the final result.
+ */
+ do {
+ oldn = n;
+ if (n->op->ops.transform_node)
+ n = n->op->ops.transform_node(n);
+ } while (oldn != n);
+
return n;
} /* transform_node */
CASE(Div);
CASE(Mod);
CASE(DivMod);
+ CASE(Quot);
CASE(Abs);
CASE(Cond);
CASE(And);
get_Load_volatility(b) == volatility_is_volatile)
/* NEVER do CSE on volatile Loads */
return 1;
+ /* do not CSE Loads with different alignment. Be conservative. */
+ if (get_Load_align(a) != get_Load_align(b))
+ return 1;
return get_Load_mode(a) != get_Load_mode(b);
} /* node_cmp_attr_Load */
/** Compares the attributes of two Store nodes. */
static int node_cmp_attr_Store(ir_node *a, ir_node *b) {
+ /* do not CSE Stores with different alignment. Be conservative. */
+ if (get_Store_align(a) != get_Store_align(b))
+ return 1;
+
/* NEVER do CSE on volatile Stores */
return (get_Store_volatility(a) == volatility_is_volatile ||
get_Store_volatility(b) == volatility_is_volatile);
projects / libfirm / blobdiff