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re PR tree-optimization/14819 ([tree-ssa] strchr is not folded at tree-level)

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PR tree-optimization/14819
	* builtins.c (fold_builtin_strchr): New.
	(fold_builtin_1): Handle BUILT_IN_STRCHR and BUILT_IN_STRRCHR
	with fold_builtin_strchr().

From-SVN: r82464
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Steven Bosscher 2004-05-30 21:05:20 +00:00 committed by Kazu Hirata
parent 9cf737f89f
commit b3dd9f3535
2 changed files with 54 additions and 0 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2004-05-30 Steven Bosscher <stevenb@suse.de>
PR tree-optimization/14819
* builtins.c (fold_builtin_strchr): New.
(fold_builtin_1): Handle BUILT_IN_STRCHR and BUILT_IN_STRRCHR
with fold_builtin_strchr().
2004-05-30 Kazu Hirata <kazu@cs.umass.edu>
* bb-reorder.c, builtins.c, c-common.c, c-gimplify.c,

47
gcc/builtins.c
View File

@ -7085,6 +7085,47 @@ fold_builtin_strncpy (tree exp)
return 0;
}
/* Fold function call to builtin strchr and strrchr.
Return NULL_TREE if no simplification can be made. */
static tree
fold_builtin_strchr (tree exp, bool actually_strrchr)
{
tree arglist = TREE_OPERAND (exp, 1);
if (!validate_arglist (arglist, POINTER_TYPE, INTEGER_TYPE, VOID_TYPE))
return 0;
else
{
tree s1 = TREE_VALUE (arglist), s2 = TREE_VALUE (TREE_CHAIN (arglist));
const char *p1;
if (TREE_CODE (s2) != INTEGER_CST)
return 0;
p1 = c_getstr (s1);
if (p1 != NULL)
{
char c;
const char *r;
if (target_char_cast (s2, &c))
return 0;
r = actually_strrchr ? strrchr (p1, c) : strchr (p1, c);
if (r == NULL)
return fold_convert (TREE_TYPE (s1), integer_zero_node);
/* Return an offset into the constant string argument. */
return fold (build2 (PLUS_EXPR, TREE_TYPE (s1),
s1, fold_convert (TREE_TYPE (s1),
ssize_int (r - p1))));
}
return 0;
}
}
/* Fold function call to builtin memcmp. Return
NULL_TREE if no simplification can be made. */
@ -7796,6 +7837,12 @@ fold_builtin_1 (tree exp)
case BUILT_IN_STRNCPY:
return fold_builtin_strncpy (exp);
case BUILT_IN_STRCHR:
return fold_builtin_strchr (exp, false);
case BUILT_IN_STRRCHR:
return fold_builtin_strchr (exp, true);
case BUILT_IN_MEMCMP:
return fold_builtin_memcmp (exp);