tree-ssa-pre.c (is_exception_related): New function

2007-06-30  Daniel Berlin  <dberlin@dberlin.org>

	* tree-ssa-pre.c (is_exception_related): New function
	(can_value_number_operation): Use it.

From-SVN: r126162

gcc/ChangeLog

@@ -25,6 +25,11 @@
 	* pa.c (hppa_can_use_return_insn_p): Delete function.  Include "df.h".
 
 2007-06-30  Daniel Berlin  <dberlin@dberlin.org>
+
+	* tree-ssa-pre.c (is_exception_related): New function
+	(can_value_number_operation): Use it.
+
+2007-06-30  Daniel Berlin  <dberlin@dberlin.org>
 	
 	Fix PR tree-optimization/32540
 	Fix PR tree-optimization/31651

gcc/tree-ssa-pre.c

@@ -2122,13 +2122,23 @@ can_value_number_call (tree stmt)
   return false;
 }
 
+/* Return true if OP is an exception handler related operation, such as
+   FILTER_EXPRor EXC_PTR_EXPR.  */
+
+static bool
+is_exception_related (tree op)
+{
+  return TREE_CODE (op) == FILTER_EXPR || TREE_CODE (op) == EXC_PTR_EXPR;
+}
+
 /* Return true if OP is a tree which we can perform value numbering
    on.  */
 
 static bool
 can_value_number_operation (tree op)
 {
-  return UNARY_CLASS_P (op)
+  return (UNARY_CLASS_P (op) 
+	  && !is_exception_related (TREE_OPERAND (op, 0)))
     || BINARY_CLASS_P (op)
     || COMPARISON_CLASS_P (op)
     || REFERENCE_CLASS_P (op)