+2005-08-17 Steven Bosscher <stevenb@suse.de>
+
+ PR tree-optimization/21574
+ * tree-ssa-ccp.c (likely_value): If the right hand side is a
+ constant, return CONSTANT.
+ (ccp_lattice_meet): Use operand_equal_p instead of simple_cst_equal.
+ (ccp_fold, visit_assignment): Likewise.
+ (evaluate_stmt): Handle UNDEFINED and UNKNOWN_VAL the same way.
+
2005-08-16 James A. Morrison <phython@gcc.gnu.org>
* c-typeck.c (build_function_call): Call fold_buildN_initializer or
&& TREE_CODE (stmt) != SWITCH_EXPR)
return VARYING;
+ if (is_gimple_min_invariant (get_rhs (stmt)))
+ return CONSTANT;
+
found_constant = false;
FOR_EACH_SSA_TREE_OPERAND (use, stmt, iter, SSA_OP_USE|SSA_OP_VUSE)
{
&& val2->lattice_val == CONSTANT
&& simple_cst_equal (val1->value, val2->value) == 1
&& (!do_store_ccp
- || simple_cst_equal (val1->mem_ref, val2->mem_ref) == 1))
+ || (val1->mem_ref && val2->mem_ref
+ && operand_equal_p (val1->mem_ref, val2->mem_ref, 0))))
{
/* Ci M Cj = Ci if (i == j)
Ci M Cj = VARYING if (i != j)
/* If the RHS is a memory load, see if the VUSEs associated with
it are a valid constant for that memory load. */
prop_value_t *val = get_value_loaded_by (stmt, const_val);
- if (val && simple_cst_equal (val->mem_ref, rhs) == 1)
+ if (val && val->mem_ref
+ && operand_equal_p (val->mem_ref, rhs, 0))
return val->value;
else
return NULL_TREE;
/* The statement produced a nonconstant value. If the statement
had UNDEFINED operands, then the result of the statement
should be UNDEFINED. Otherwise, the statement is VARYING. */
- val.lattice_val = (likelyvalue == UNDEFINED) ? UNDEFINED : VARYING;
+ if (likelyvalue == UNDEFINED || likelyvalue == UNKNOWN_VAL)
+ val.lattice_val = likelyvalue;
+ else
+ val.lattice_val = VARYING;
+
val.value = NULL_TREE;
}
we can propagate the value on the RHS. */
prop_value_t *nval = get_value_loaded_by (stmt, const_val);
- if (nval && simple_cst_equal (nval->mem_ref, rhs) == 1)
+ if (nval && nval->mem_ref
+ && operand_equal_p (nval->mem_ref, rhs, 0))
val = *nval;
else
val = evaluate_stmt (stmt);