# include "iropt_dbg.h"
# include "irflag_t.h"
# include "firmstat.h"
+# include "irarch.h"
/* Make types visible to allow most efficient access */
# include "entity_t.h"
return n;
}
-/**
- * Returns the tarval of a Const node or tarval_bad for all other nodes.
- */
-static INLINE tarval *
-value_of (ir_node *n)
-{
- if ((n != NULL) && (get_irn_op(n) == op_Const))
- return get_Const_tarval(n); /* might return tarval_bad */
- else
- return tarval_bad;
-}
-
/**
* return the value of a Constant
*/
return tarval_bad;
}
+/**
+ * return the value of an Add
+ */
static tarval *computed_value_Add(ir_node *n)
{
ir_node *a = get_Add_left(n);
return tarval_bad;
}
+/**
+ * return the value of a Sub
+ * Special case: a - a
+ */
static tarval *computed_value_Sub(ir_node *n)
{
ir_node *a = get_Sub_left(n);
return tarval_bad;
}
+/**
+ * return the value of an unary Minus
+ */
static tarval *computed_value_Minus(ir_node *n)
{
ir_node *a = get_Minus_op(n);
return tarval_bad;
}
+/**
+ * return the value of a Mul
+ */
static tarval *computed_value_Mul(ir_node *n)
{
ir_node *a = get_Mul_left(n);
return tarval_bad;
}
+/**
+ * return the value of a floating point Quot
+ */
static tarval *computed_value_Quot(ir_node *n)
{
ir_node *a = get_Quot_left(n);
return tarval_bad;
}
-static tarval *computed_value_Div(ir_node *n)
+/**
+ * calculate the value of an integer Div of two nodes
+ * Special case: 0 / b
+ */
+static tarval *do_computed_value_Div(ir_node *a, ir_node *b)
{
- ir_node *a = get_Div_left(n);
- ir_node *b = get_Div_right(n);
-
tarval *ta = value_of(a);
tarval *tb = value_of(b);
- /* This was missing in original implementation. Why? */
- if ((ta != tarval_bad) && (tb != tarval_bad) && (get_irn_mode(a) == get_irn_mode(b))) {
- if (tb != get_mode_null(get_tarval_mode(tb))) /* div by zero: return tarval_bad */
+ /* Compute c1 / c2 or 0 / a, a != 0 */
+ if ((ta != tarval_bad) && (tb != get_mode_null(get_irn_mode(b)))) {
+ if (tb != tarval_bad) /* div by zero: return tarval_bad */
return tarval_div(ta, tb);
+ else if (ta == get_mode_null(get_tarval_mode(ta))) /* 0 / b == 0 */
+ return ta;
}
return tarval_bad;
}
-static tarval *computed_value_Mod(ir_node *n)
+/**
+ * return the value of an integer Div
+ */
+static tarval *computed_value_Div(ir_node *n)
{
- ir_node *a = get_Mod_left(n);
- ir_node *b = get_Mod_right(n);
+ return do_computed_value_Div(get_Div_left(n), get_Div_right(n));
+}
+/**
+ * calculate the value of an integer Mod of two nodes
+ * Special case: a % 1
+ */
+static tarval *do_computed_value_Mod(ir_node *a, ir_node *b)
+{
tarval *ta = value_of(a);
tarval *tb = value_of(b);
- /* This was missing in original implementation. Why? */
- if ((ta != tarval_bad) && (tb != tarval_bad) && (get_irn_mode(a) == get_irn_mode(b))) {
- if (tb != get_mode_null(get_tarval_mode(tb))) /* div by zero: return tarval_bad */
+ /* Compute c1 % c2 or a % 1 */
+ if (tb != tarval_bad) {
+ if ((ta != tarval_bad) && (tb != get_mode_null(get_tarval_mode(tb)))) /* div by zero: return tarval_bad */
return tarval_mod(ta, tb);
+ else if (tb == get_mode_one(get_tarval_mode(tb))) /* x mod 1 == 0 */
+ return get_mode_null(get_irn_mode(a));
}
return tarval_bad;
}
+/**
+ * return the value of an integer Mod
+ */
+static tarval *computed_value_Mod(ir_node *n)
+{
+ return do_computed_value_Mod(get_Mod_left(n), get_Mod_right(n));
+}
+
+/**
+ * return the value of an Abs
+ */
static tarval *computed_value_Abs(ir_node *n)
{
ir_node *a = get_Abs_op(n);
return tarval_bad;
}
+/**
+ * return the value of an And
+ * Special case: a & 0, 0 & b
+ */
static tarval *computed_value_And(ir_node *n)
{
ir_node *a = get_And_left(n);
return tarval_bad;
}
+/**
+ * return the value of an Or
+ * Special case: a | 1...1, 1...1 | b
+ */
static tarval *computed_value_Or(ir_node *n)
{
ir_node *a = get_Or_left(n);
return tarval_bad;
}
+/**
+ * return the value of an Eor
+ */
static tarval *computed_value_Eor(ir_node *n)
{
ir_node *a = get_Eor_left(n);
return tarval_bad;
}
+/**
+ * return the value of a Not
+ */
static tarval *computed_value_Not(ir_node *n)
{
ir_node *a = get_Not_op(n);
return tarval_bad;
}
+/**
+ * return the value of a Shl
+ */
static tarval *computed_value_Shl(ir_node *n)
{
ir_node *a = get_Shl_left(n);
return tarval_bad;
}
+/**
+ * return the value of a Shr
+ */
static tarval *computed_value_Shr(ir_node *n)
{
ir_node *a = get_Shr_left(n);
return tarval_bad;
}
+/**
+ * return the value of a Shrs
+ */
static tarval *computed_value_Shrs(ir_node *n)
{
ir_node *a = get_Shrs_left(n);
return tarval_bad;
}
+/**
+ * return the value of a Rot
+ */
static tarval *computed_value_Rot(ir_node *n)
{
ir_node *a = get_Rot_left(n);
return tarval_bad;
}
+/**
+ * return the value of a Conv
+ */
static tarval *computed_value_Conv(ir_node *n)
{
ir_node *a = get_Conv_op(n);
return tarval_bad;
}
+/**
+ * return the value of a Proj, handle Proj(Cmp), Proj(Div), Proj(Mod), Proj(DivMod)
+ */
static tarval *computed_value_Proj(ir_node *n)
{
- ir_node *a = get_Proj_pred(n), *b;
+ ir_node *a = get_Proj_pred(n);
ir_node *aa, *ab;
+ long proj_nr;
/* Optimize Cmp nodes.
This performs a first step of unreachable code elimination.
case iro_Cmp:
aa = get_Cmp_left(a);
ab = get_Cmp_right(a);
+ proj_nr = get_Proj_proj(n);
if (aa == ab) { /* 1.: */
/* This is a trick with the bits used for encoding the Cmp
Proj numbers, the following statement is not the same:
- return new_tarval_from_long ((get_Proj_proj(n) == Eq), mode_b) */
- return new_tarval_from_long ((get_Proj_proj(n) & Eq), mode_b);
+ return new_tarval_from_long (proj_nr == Eq, mode_b) */
+ return new_tarval_from_long (proj_nr & Eq, mode_b);
} else {
tarval *taa = computed_value (aa);
tarval *tab = computed_value (ab);
/* strange checks... */
pnc_number flags = tarval_cmp (taa, tab);
if (flags != False) {
- return new_tarval_from_long (get_Proj_proj(n) & flags, mode_b);
+ return new_tarval_from_long (proj_nr & flags, mode_b);
}
} else { /* check for 3.: */
ir_node *aaa = skip_Id(skip_Proj(aa));
&& (mode_is_reference(get_irn_mode(ab)))
&& (get_irn_op(aba) == op_Alloc)))
/* 3.: */
- return new_tarval_from_long (get_Proj_proj(n) & Ne, mode_b);
+ return new_tarval_from_long (proj_nr & Ne, mode_b);
}
}
break;
case iro_DivMod:
- {
- tarval *tb = value_of(b = get_DivMod_right(a));
- tarval *ta = value_of(a = get_DivMod_left(a));
-
- if ((ta != tarval_bad) && (tb != tarval_bad) && (get_irn_mode(a) == get_irn_mode(b))) {
- if (tb == get_mode_null(get_tarval_mode(tb))) /* div by zero: return tarval_bad */
- return tarval_bad;
- if (get_Proj_proj(n)== pn_DivMod_res_div)
- return tarval_div(ta, tb);
- else if (get_Proj_proj(n)== pn_DivMod_res_mod)
- return tarval_mod(ta, tb);
- }
+ /* compute either the Div or the Mod part */
+ proj_nr = get_Proj_proj(n);
+ if (proj_nr == pn_DivMod_res_div)
+ return do_computed_value_Div(get_DivMod_left(a), get_DivMod_right(a));
+ else if (proj_nr == pn_DivMod_res_mod)
+ return do_computed_value_Mod(get_DivMod_left(a), get_DivMod_right(a));
break;
- }
case iro_Div:
- {
- tarval *tb = value_of(b = get_Div_right(a));
- tarval *ta = value_of(a = get_Div_left(a));
-
- if ((ta != tarval_bad) && (tb != tarval_bad) && (get_irn_mode(a) == get_irn_mode(b))) {
- if (tb == get_mode_null(get_tarval_mode(tb))) /* div by zero: return tarval_bad */
- return tarval_bad;
- if (get_Proj_proj(n)== pn_Div_res)
- return tarval_div(ta, tb);
- }
+ if (get_Proj_proj(n) == pn_Div_res)
+ return computed_value(a);
break;
- }
case iro_Mod:
- {
- tarval *tb = value_of(b = get_Mod_right(a));
- tarval *ta = value_of(a = get_Mod_left(a));
-
- if ((ta != tarval_bad) && (tb != tarval_bad) && (get_irn_mode(a) == get_irn_mode(b))) {
- if (tb == get_mode_null(get_tarval_mode(tb))) /* div by zero: return tarval_bad */
- return tarval_bad;
- if (get_Proj_proj(n)== pn_Mod_res)
- return tarval_mod(ta, tb);
- }
+ if (get_Proj_proj(n) == pn_Mod_res)
+ return computed_value(a);
break;
- }
default:
return tarval_bad;
return n;
}
+/**
+ * Optimize a / 1 = a.
+ */
+static ir_node *equivalent_node_DivMod(ir_node *n)
+{
+ ir_node *a = get_DivMod_left(n);
+ ir_node *b = get_DivMod_right(n);
+
+ /* Div is not commutative. */
+ if (classify_tarval(computed_value(b)) == TV_CLASSIFY_ONE) { /* div(x, 1) == x */
+ /* Turn DivMod into a tuple (mem, bad, a, 0) */
+ ir_node *mem = get_Div_mem(n);
+ ir_mode *mode = get_irn_mode(b);
+
+ turn_into_tuple(n, 4);
+ set_Tuple_pred(n, pn_DivMod_M, mem);
+ set_Tuple_pred(n, pn_DivMod_X_except, new_Bad()); /* no exception */
+ set_Tuple_pred(n, pn_DivMod_res_div, a);
+ set_Tuple_pred(n, pn_DivMod_res_mod, new_Const(mode, get_mode_null(mode)));
+ }
+ return n;
+}
+
/**
* Optimize a & 0b1...1 = 0b1...1 & a = a & a = a.
*/
return n;
}
+static ir_node *equivalent_node_Cast(ir_node *n) {
+ ir_node *pred = get_Cast_op(n);
+ if (get_irn_type(pred) == get_Cast_type(n))
+ n = pred;
+ return n;
+}
+
static ir_node *equivalent_node_Phi(ir_node *n)
{
/* Several optimizations:
CASE(Minus);
CASE(Mul);
CASE(Div);
+ CASE(DivMod);
CASE(And);
CASE(Conv);
+ CASE(Cast);
CASE(Phi);
CASE(Proj);
CASE(Id);
} /* end switch */
}
+/** Do architecture dependend optimizations on Mul nodes */
+static ir_node *transform_node_Mul(ir_node *n) {
+ return arch_dep_replace_mul_with_shifts(n);
+}
+
static ir_node *transform_node_Div(ir_node *n)
{
tarval *tv = computed_value(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) {
+ if (tv != tarval_bad)
+ value = new_Const(get_tarval_mode(tv), tv);
+ else /* Try architecture dependand optimization */
+ value = arch_dep_replace_div_by_const(n);
+
+ if (value != n) {
/* Turn Div into a tuple (mem, bad, value) */
ir_node *mem = get_Div_mem(n);
turn_into_tuple(n, 3);
set_Tuple_pred(n, pn_Div_M, mem);
set_Tuple_pred(n, pn_Div_X_except, new_Bad());
- set_Tuple_pred(n, pn_Div_res, new_Const(get_tarval_mode(tv), tv));
+ set_Tuple_pred(n, pn_Div_res, value);
}
return n;
}
static ir_node *transform_node_Mod(ir_node *n)
{
tarval *tv = computed_value(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) {
+ if (tv != tarval_bad)
+ value = new_Const(get_tarval_mode(tv), tv);
+ else /* Try architecture dependand optimization */
+ value = arch_dep_replace_mod_by_const(n);
+
+ if (value != n) {
/* Turn Mod into a tuple (mem, bad, value) */
ir_node *mem = get_Mod_mem(n);
+
turn_into_tuple(n, 3);
set_Tuple_pred(n, pn_Mod_M, mem);
set_Tuple_pred(n, pn_Mod_X_except, new_Bad());
- set_Tuple_pred(n, pn_Mod_res, new_Const(get_tarval_mode(tv), tv));
+ set_Tuple_pred(n, pn_Mod_res, value);
}
return n;
}
b = new_Const (mode, resb);
evaluated = 1;
}
+ else { /* Try architecture dependand optimization */
+ arch_dep_replace_divmod_by_const(&a, &b, n);
+ evaluated = a != NULL;
+ }
} else if (ta == get_mode_null(mode)) {
+ /* 0 / non-Const = 0 */
b = a;
evaluated = 1;
}
+
if (evaluated) { /* replace by tuple */
ir_node *mem = get_DivMod_mem(n);
turn_into_tuple(n, 4);
}
/**
- * Transfor a boolean Not.
+ * Transform a boolean Not.
*/
static ir_node *transform_node_Not(ir_node *n)
{
return n;
}
+static ir_node *transform_node_Cast(ir_node *n) {
+ ir_node *pred = get_Cast_op(n);
+ type *tp = get_irn_type(pred);
+ if (get_irn_op(pred) == op_Const && get_Const_type(pred) != tp) {
+ n = new_rd_Const_type(NULL, current_ir_graph, get_nodes_block(pred), get_irn_mode(pred),
+ get_Const_tarval(pred), tp);
+ } else if ((get_irn_op(pred) == op_SymConst) && (get_SymConst_value_type(pred) != tp)) {
+ n = new_rd_SymConst_type(NULL, current_ir_graph, get_nodes_block(pred), get_SymConst_symbol(pred),
+ get_SymConst_kind(pred), tp);
+ }
+ return n;
+}
+
/**
* Transform a Div/Mod/DivMod with a non-zero constant. Must be
- * done here instead of equivalent node because in creates new
+ * done here instead of equivalent node because it creates new
* nodes.
+ * Removes the exceptions and routes the memory to the initial mem.
+ *
+ * Further, it optimizes jump tables by removing all impossible cases.
*/
static ir_node *transform_node_Proj(ir_node *proj)
{
if (tb != tarval_bad && classify_tarval(tb) != TV_CLASSIFY_NULL) { /* div(x, c) && c != 0 */
proj_nr = get_Proj_proj(proj);
+ /* this node may float */
+ set_irn_pinned(n, op_pin_state_floats);
+
if (proj_nr == pn_Div_X_except) {
/* we found an exception handler, remove it */
return new_Bad();
}
- else if (proj_nr == pn_Div_M) {
+ else {
/* the memory Proj can be removed */
ir_node *res = get_Div_mem(n);
set_Div_mem(n, get_irg_initial_mem(current_ir_graph));
- return res;
+
+ if (proj_nr == pn_Div_M)
+ return res;
}
}
break;
if (tb != tarval_bad && classify_tarval(tb) != TV_CLASSIFY_NULL) { /* mod(x, c) && c != 0 */
proj_nr = get_Proj_proj(proj);
+ /* this node may float */
+ set_irn_pinned(n, op_pin_state_floats);
+
if (proj_nr == pn_Mod_X_except) {
/* we found an exception handler, remove it */
return new_Bad();
}
- else if (proj_nr == pn_Mod_M) {
+ else {
/* the memory Proj can be removed */
ir_node *res = get_Mod_mem(n);
set_Mod_mem(n, get_irg_initial_mem(current_ir_graph));
- return res;
+ if (proj_nr == pn_Mod_M)
+ return res;
}
}
break;
if (tb != tarval_bad && classify_tarval(tb) != TV_CLASSIFY_NULL) { /* DivMod(x, c) && c != 0 */
proj_nr = get_Proj_proj(proj);
+ /* this node may float */
+ set_irn_pinned(n, op_pin_state_floats);
+
if (proj_nr == pn_DivMod_X_except) {
+ /* we found an exception handler, remove it */
return new_Bad();
}
- else if (proj_nr == pn_DivMod_M) {
+ else {
/* the memory Proj can be removed */
ir_node *res = get_DivMod_mem(n);
set_DivMod_mem(n, get_irg_initial_mem(current_ir_graph));
- return res;
+ if (proj_nr == pn_DivMod_M)
+ return res;
}
}
break;
return transform_node_Or(or);
}
+/* forward */
+static ir_node *transform_node(ir_node *n);
+
+/**
+ * Optimize (a >> c1) >> c2), works for Shr, Shrs, Shl
+ */
+static ir_node * transform_node_shift(ir_node *n)
+{
+ ir_node *left;
+ tarval *tv1, *tv2, *res;
+ ir_mode *mode;
+ int modulo_shf, flag;
+
+ left = get_binop_left(n);
+
+ /* different operations */
+ if (get_irn_op(left) != get_irn_op(n))
+ return n;
+
+ tv1 = computed_value(get_binop_right(n));
+ if (tv1 == tarval_bad)
+ return n;
+
+ tv2 = computed_value(get_binop_right(left));
+ if (tv2 == tarval_bad)
+ return n;
+
+ res = tarval_add(tv1, tv2);
+
+ /* beware: a simple replacement works only, if res < modulo shift */
+ mode = get_irn_mode(n);
+
+ flag = 0;
+
+ modulo_shf = get_mode_modulo_shift(mode);
+ if (modulo_shf > 0) {
+ tarval *modulo = new_tarval_from_long(modulo_shf, get_tarval_mode(res));
+
+ if (tarval_cmp(res, modulo) & Lt)
+ flag = 1;
+ }
+ else
+ flag = 1;
+
+ if (flag) {
+ /* ok, we can replace it */
+ ir_node *in[2], *irn, *block = get_nodes_block(n);
+
+ in[0] = get_binop_left(left);
+ in[1] = new_r_Const(current_ir_graph, block, get_tarval_mode(res), res);
+
+ irn = new_ir_node(NULL, current_ir_graph, block, get_irn_op(n), mode, 2, in);
+
+ return transform_node(irn);
+ }
+ return n;
+}
+
+
/**
* Tries several [inplace] [optimizing] transformations and returns an
* equivalent node. The difference to equivalent_node() is that these
break
switch (op->code) {
+ CASE(Mul);
CASE(Div);
CASE(Mod);
CASE(DivMod);
CASE(Cond);
CASE(Eor);
CASE(Not);
+ CASE(Cast);
CASE(Proj);
CASE(Or);
+ case iro_Shr:
+ case iro_Shrs:
+ case iro_Shl:
+ op->transform_node = transform_node_shift;
+ break;
default:
op->transform_node = NULL;
}
in a graph. */
#define N_IR_NODES 512
+/** Compares the attributes of two Const nodes. */
static int node_cmp_attr_Const(ir_node *a, ir_node *b)
{
return (get_Const_tarval(a) != get_Const_tarval(b))
|| (get_Const_type(a) != get_Const_type(b));
}
+/** Compares the attributes of two Proj nodes. */
static int node_cmp_attr_Proj(ir_node *a, ir_node *b)
{
return get_irn_proj_attr (a) != get_irn_proj_attr (b);
}
+/** Compares the attributes of two Filter nodes. */
static int node_cmp_attr_Filter(ir_node *a, ir_node *b)
{
return get_Filter_proj(a) != get_Filter_proj(b);
}
+/** Compares the attributes of two Alloc nodes. */
static int node_cmp_attr_Alloc(ir_node *a, ir_node *b)
{
return (get_irn_alloc_attr(a).where != get_irn_alloc_attr(b).where)
- || (get_irn_alloc_attr(a).type != get_irn_alloc_attr(b).type);
+ || (get_irn_alloc_attr(a).type != get_irn_alloc_attr(b).type);
}
+/** Compares the attributes of two Free nodes. */
static int node_cmp_attr_Free(ir_node *a, ir_node *b)
{
return (get_irn_free_attr(a) != get_irn_free_attr(b));
}
+/** Compares the attributes of two SymConst nodes. */
static int node_cmp_attr_SymConst(ir_node *a, ir_node *b)
{
return (get_irn_symconst_attr(a).num != get_irn_symconst_attr(b).num)
- || (get_irn_symconst_attr(a).sym.type_p != get_irn_symconst_attr(b).sym.type_p);
+ || (get_irn_symconst_attr(a).sym.type_p != get_irn_symconst_attr(b).sym.type_p)
+ || (get_irn_symconst_attr(a).tp != get_irn_symconst_attr(b).tp);
}
+/** Compares the attributes of two Call nodes. */
static int node_cmp_attr_Call(ir_node *a, ir_node *b)
{
return (get_irn_call_attr(a) != get_irn_call_attr(b));
}
+/** Compares the attributes of two FuncCall nodes. */
static int node_cmp_attr_FuncCall(ir_node *a, ir_node *b)
{
return (get_irn_funccall_attr(a) != get_irn_funccall_attr(b));
}
+/** Compares the attributes of two Sel nodes. */
static int node_cmp_attr_Sel(ir_node *a, ir_node *b)
{
- return (get_irn_sel_attr(a).ent->kind != get_irn_sel_attr(b).ent->kind)
- || (get_irn_sel_attr(a).ent->name != get_irn_sel_attr(b).ent->name)
- || (get_irn_sel_attr(a).ent->owner != get_irn_sel_attr(b).ent->owner)
+ return (get_irn_sel_attr(a).ent->kind != get_irn_sel_attr(b).ent->kind)
+ || (get_irn_sel_attr(a).ent->name != get_irn_sel_attr(b).ent->name)
+ || (get_irn_sel_attr(a).ent->owner != get_irn_sel_attr(b).ent->owner)
|| (get_irn_sel_attr(a).ent->ld_name != get_irn_sel_attr(b).ent->ld_name)
- || (get_irn_sel_attr(a).ent->type != get_irn_sel_attr(b).ent->type);
+ || (get_irn_sel_attr(a).ent->type != get_irn_sel_attr(b).ent->type);
}
+/** Compares the attributes of two Phi nodes. */
static int node_cmp_attr_Phi(ir_node *a, ir_node *b)
{
return get_irn_phi_attr (a) != get_irn_phi_attr (b);
}
+/** Compares the attributes of two Cast nodes. */
static int node_cmp_attr_Cast(ir_node *a, ir_node *b)
{
return get_Cast_type(a) != get_Cast_type(b);
}
+/** Compares the attributes of two Load nodes. */
static int node_cmp_attr_Load(ir_node *a, ir_node *b)
{
if (get_Load_volatility(a) == volatility_is_volatile ||
return get_Load_mode(a) != get_Load_mode(b);
}
+/** Compares the attributes of two Store nodes. */
static int node_cmp_attr_Store(ir_node *a, ir_node *b)
{
/* NEVER do CSE on volatile Stores */
return (get_Store_volatility(a) == volatility_is_volatile ||
- get_Load_volatility(b) == volatility_is_volatile);
+ get_Store_volatility(b) == volatility_is_volatile);
}
/**
return 1;
/* for block-local cse and op_pin_state_pinned nodes: */
- if (!get_opt_global_cse() || (get_op_pinned(get_irn_op(a)) == op_pin_state_pinned)) {
+ if (!get_opt_global_cse() || (get_irn_pinned(a) == op_pin_state_pinned)) {
if (get_irn_n(a, -1) != get_irn_n(b, -1))
return 1;
}
if (!value_table) return n;
- /* TODO: use a generic commutative attribute */
if (get_opt_reassociation()) {
if (is_op_commutative(get_irn_op(n))) {
ir_node *l = get_binop_left(n);
o = pset_find (value_table, n, ir_node_hash (n));
if (!o) return n;
+ DBG_OPT_CSE(n, o);
+
return o;
}
* if it isn't there yet.
*/
static ir_node *
-identify_remember (pset *value_table, ir_node *node)
+identify_remember (pset *value_table, ir_node *n)
{
ir_node *o = NULL;
- if (!value_table) return node;
+ if (!value_table) return n;
+
+ if (get_opt_reassociation()) {
+ if (is_op_commutative(get_irn_op(n))) {
+ ir_node *l = get_binop_left(n);
+ ir_node *r = get_binop_right(n);
+
+ /* for commutative operators perform a OP b == b OP a */
+ if (l > r) {
+ set_binop_left(n, r);
+ set_binop_right(n, l);
+ }
+ }
+ }
/* lookup or insert in hash table with given hash key. */
- o = pset_insert (value_table, node, ir_node_hash (node));
+ o = pset_insert (value_table, n, ir_node_hash (n));
- if (o == node) return node;
+ if (o != n) {
+ DBG_OPT_CSE(n, o);
+ }
return o;
}
void
add_identities (pset *value_table, ir_node *node) {
- identify_remember (value_table, node);
+ if (get_opt_cse() && (get_irn_opcode(node) != iro_Block))
+ identify_remember (value_table, node);
}
/**
ir_node *oldn = n;
opcode iro = get_irn_opcode(n);
+ type *old_tp = get_irn_type(n);
+ {
+ int i, arity = get_irn_arity(n);
+ for (i = 0; i < arity && !old_tp; ++i)
+ old_tp = get_irn_type(get_irn_n(n, i));
+ }
+
/* Allways optimize Phi nodes: part of the construction. */
if ((!get_opt_optimize()) && (iro != iro_Phi)) return n;
/* evaluation was successful -- replace the node. */
obstack_free (current_ir_graph->obst, n);
n = new_Const (get_tarval_mode (tv), tv);
-
- DBG_OPT_ALGSIM0(oldn, n);
+ if (old_tp && get_type_mode(old_tp) == get_tarval_mode (tv))
+ set_Const_type(n, old_tp);
+ DBG_OPT_ALGSIM0(oldn, n);
return n;
}
}
ir_node *oldn = n;
opcode iro = get_irn_opcode(n);
+ type *old_tp = get_irn_type(n);
+ {
+ int i, arity = get_irn_arity(n);
+ for (i = 0; i < arity && !old_tp; ++i)
+ old_tp = get_irn_type(get_irn_n(n, i));
+ }
+
if (!get_opt_optimize() && (get_irn_op(n) != op_Phi)) return n;
/* if not optimize return n */
return n;
}
-
/* constant expression evaluation / constant folding */
if (get_opt_constant_folding()) {
/* constants can not be evaluated */
if ((get_irn_mode(n) != mode_T) && (tv != tarval_bad)) {
/* evaluation was successful -- replace the node. */
n = new_Const (get_tarval_mode (tv), tv);
-
- DBG_OPT_ALGSIM0(oldn, n);
+ if (old_tp && get_type_mode(old_tp) == get_tarval_mode (tv))
+ set_Const_type(n, old_tp);
+ DBG_OPT_ALGSIM0(oldn, n);
return n;
}
}