re PR tree-optimization/15743 (Fold index() at tree level.)

	PR tree-optimization/15743.
	* builtins.c (fold_builtin_1): Fold index() and rindex().

From-SVN: r82491

gcc/ChangeLog

+2004-05-31  Kazu Hirata  <kazu@cs.umass.edu>
+
+	PR tree-optimization/15743.
+	* builtins.c (fold_builtin_1): Fold index() and rindex().
+
 2004-05-31  Roger Sayle  <roger@eyesopen.com>
 
 	PR middle-end/15069

gcc/builtins.c

@@ -7838,9 +7838,11 @@ fold_builtin_1 (tree exp)
     case BUILT_IN_STRNCPY:
       return fold_builtin_strncpy (exp);
 
+    case BUILT_IN_INDEX:
     case BUILT_IN_STRCHR:
       return fold_builtin_strchr (exp, false);
 
+    case BUILT_IN_RINDEX:
     case BUILT_IN_STRRCHR:
       return fold_builtin_strchr (exp, true);