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re PR tree-optimization/21088 (VRP passes fold the type of operands of a comparison)

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PR tree-optimization/21088
	* fold-const.c (fold_unary, fold_binary, fold_ternary):
	Export.
	* tree-vrp.c (compare_values): Use fold_binary to compare
	pointers.  Use boolean_type_node as the type of a comparison
	expression being folded.
	* tree.h: Add prototypes for fold_unary, fold_binary,
	fold_ternary.

From-SVN: r98600
This commit is contained in:
Kazu Hirata 2005-04-23 02:01:53 +00:00 committed by Kazu Hirata
parent 84d658141e
commit 721425b6ad
4 changed files with 20 additions and 6 deletions
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11
gcc/ChangeLog
View File

@ -1,3 +1,14 @@
2005-04-23 Kazu Hirata <kazu@cs.umass.edu>
PR tree-optimization/21088
* fold-const.c (fold_unary, fold_binary, fold_ternary):
Export.
* tree-vrp.c (compare_values): Use fold_binary to compare
pointers. Use boolean_type_node as the type of a comparison
expression being folded.
* tree.h: Add prototypes for fold_unary, fold_binary,
fold_ternary.
2005-04-22 Diego Novillo <dnovillo@redhat.com>
* Makefile.in (tree-into-ssa.o): Add dependency on PARAMS_H.

6
gcc/fold-const.c
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@ -6678,7 +6678,7 @@ fold_complex_div (tree type, tree ac, tree bc, enum tree_code code)
OP0. Return the folded expression if folding is successful.
Otherwise, return NULL_TREE. */
static tree
tree
fold_unary (enum tree_code code, tree type, tree op0)
{
tree tem;
@ -7113,7 +7113,7 @@ fold_unary (enum tree_code code, tree type, tree op0)
OP0 and OP1. Return the folded expression if folding is
successful. Otherwise, return NULL_TREE. */
static tree
tree
fold_binary (enum tree_code code, tree type, tree op0, tree op1)
{
tree t1 = NULL_TREE;
@ -9852,7 +9852,7 @@ fold_binary (enum tree_code code, tree type, tree op0, tree op1)
OP0, OP1, and OP2. Return the folded expression if folding is
successful. Otherwise, return NULL_TREE. */
static tree
tree
fold_ternary (enum tree_code code, tree type, tree op0, tree op1, tree op2)
{
tree tem;

6
gcc/tree-vrp.c
View File

@ -416,17 +416,17 @@ compare_values (tree val1, tree val2)
return 0;
/* If VAL1 is a lower address than VAL2, return -1. */
t = fold (build2 (LT_EXPR, TREE_TYPE (val1), val1, val2));
t = fold_binary (LT_EXPR, boolean_type_node, val1, val2);
if (t == boolean_true_node)
return -1;
/* If VAL1 is a higher address than VAL2, return +1. */
t = fold (build2 (GT_EXPR, TREE_TYPE (val1), val1, val2));
t = fold_binary (GT_EXPR, boolean_type_node, val1, val2);
if (t == boolean_true_node)
return 1;
/* If VAL1 is different than VAL2, return +2. */
t = fold (build2 (NE_EXPR, TREE_TYPE (val1), val1, val2));
t = fold_binary (NE_EXPR, boolean_type_node, val1, val2);
if (t == boolean_true_node)
return 2;

3
gcc/tree.h
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@ -3511,6 +3511,9 @@ extern void using_eh_for_cleanups (void);
subexpressions are not changed. */
extern tree fold (tree);
extern tree fold_unary (enum tree_code, tree, tree);
extern tree fold_binary (enum tree_code, tree, tree, tree);
extern tree fold_ternary (enum tree_code, tree, tree, tree, tree);
extern tree fold_build1 (enum tree_code, tree, tree);
extern tree fold_build2 (enum tree_code, tree, tree, tree);
extern tree fold_build3 (enum tree_code, tree, tree, tree, tree);