File nvl623386.patch of Package gcc43

2010-08-26  Richard Guenther  <rguenther@suse.de>

	* tree-ssa-copyrename.c (copy_rename_partition_coalesce): Do not
	coalesce different types.

	* g++.dg/torture/20100825.C: New testcase.

Index: gcc/tree-ssa-copyrename.c
===================================================================
--- gcc/tree-ssa-copyrename.c.orig	2011-01-21 12:26:07.000000000 +0100
+++ gcc/tree-ssa-copyrename.c	2011-01-21 12:27:22.000000000 +0100
@@ -239,7 +239,12 @@ copy_rename_partition_coalesce (var_map
     }
 
   /* Don't coalesce if the two variables aren't type compatible.  */
-  if (!types_compatible_p (TREE_TYPE (root1), TREE_TYPE (root2)))
+  if (!types_compatible_p (TREE_TYPE (root1), TREE_TYPE (root2))
+      /* There is a disconnect between the middle-end type-system and
+	 VRP, avoid coalescing enum types with different bounds.  */
+      || ((TREE_CODE (TREE_TYPE (root1)) == ENUMERAL_TYPE
+	   || TREE_CODE (TREE_TYPE (root2)) == ENUMERAL_TYPE)
+	  && TREE_TYPE (root1) != TREE_TYPE (root2)))
     {
       if (debug)
 	fprintf (debug, " : Incompatible types.  No coalesce.\n");
Index: gcc/testsuite/g++.dg/torture/20100825.C
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ gcc/testsuite/g++.dg/torture/20100825.C	2011-01-21 12:26:26.000000000 +0100
@@ -0,0 +1,15 @@
+// { dg-do run }
+
+typedef enum { zero = 0, one = 1, two = 2, ENUM_MAX = 3 } my_enum;
+my_enum e;
+extern "C" void abort (void);
+int __attribute__((noinline)) foo() { return 10; }
+int main()
+{
+  int r;
+  r = foo();
+  if ((r < 0) || (r >= ENUM_MAX))
+    return 0;
+  e = (my_enum)r;
+  abort ();
+}