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re PR tree-optimization/15738 ([tree-ssa] Convert strrchr(s, c) to strchr(s, c) if c is known to be 0)

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PR tree-optimization/15738.
	* builtins.c (fold_builtin_strchr): Transform
	strrchr (s, '\0') to strchr (s, '\0').

From-SVN: r82572
This commit is contained in:
Kazu Hirata 2004-06-02 18:41:40 +00:00 committed by Kazu Hirata
parent dff008b446
commit 91fa0e3de6
2 changed files with 21 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-06-02 Kazu Hirata <kazu@cs.umass.edu>
PR tree-optimization/15738.
* builtins.c (fold_builtin_strchr): Transform
strrchr (s, '\0') to strchr (s, '\0').
2004-06-02 Steven Bosscher <stevenb@suse.de>
* i386.c (ix86_adjust_cost): Don't increase the cost for

15
gcc/builtins.c
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@ -7123,6 +7123,21 @@ fold_builtin_strchr (tree exp, bool actually_strrchr)
ssize_int (r - p1))));
}
if (actually_strrchr)
{
tree fn;
if (!integer_zerop (s2))
return 0;
fn = implicit_built_in_decls[BUILT_IN_STRCHR];
if (!fn)
return 0;
/* Transform strrchr(s1, '\0') to strchr(s1, '\0'). */
return build_function_call_expr (fn, arglist);
}
return 0;
}
}