From 43c77eaa7684a741554c41a07d954bdab755ca1e Mon Sep 17 00:00:00 2001
From: kazu <kazu@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 2 Jun 2004 18:41:40 +0000
Subject: [PATCH] 	PR tree-optimization/15738. 	* builtins.c
 (fold_builtin_strchr): Transform 	strrchr (s, '\0') to strchr (s, '\0').

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@82572 138bc75d-0d04-0410-961f-82ee72b054a4
---
 gcc/ChangeLog  |  6 ++++++
 gcc/builtins.c | 15 +++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index bb675bb3fea..8d22422d993 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -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
diff --git a/gcc/builtins.c b/gcc/builtins.c
index e44ad61b7b2..e2651866d63 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -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;
     }
 }
-- 
2.11.4.GIT