re PR tree-optimization/46806 (-O3 implies 0 <= 8 <= 7)

2010-12-06  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/46806
	* tree-ssa-copyrename.c (copy_rename_partition_coalesce): Do not
	coalesce different types.

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

From-SVN: r167490

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ccb7019fa41b3f3116bd81c4e42ec7156ced0bcb..f01b9fe11aea4fdc561a00ee1e5b977858bf051d 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2010-12-06  Richard Guenther  <rguenther@suse.de>
+
+       PR tree-optimization/46806
+       * tree-ssa-copyrename.c (copy_rename_partition_coalesce): Do not
+       coalesce different types.
+
 2010-12-06  Richard Guenther  <rguenther@suse.de>
 
        PR tree-optimization/46785

diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 600655d1d2cc5584cfecd30b6f30dc8c0b34d72b..5c3b6971e3415645e1c7c5f7ed7b717f492e2315 100644 (file)
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2010-12-06  Richard Guenther  <rguenther@suse.de>
+
+       PR tree-optimization/46806
+       * g++.dg/torture/20100825.C: New testcase.
+
 2010-12-06  Richard Guenther  <rguenther@suse.de>
 
        PR tree-optimization/46785

diff --git a/gcc/testsuite/g++.dg/torture/20100825.C b/gcc/testsuite/g++.dg/torture/20100825.C
new file mode 100644 (file)
index 0000000..460c1b6
--- /dev/null
+++ b/gcc/testsuite/g++.dg/torture/20100825.C
@@ -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 ();
+}

diff --git a/gcc/tree-ssa-copyrename.c b/gcc/tree-ssa-copyrename.c
index 41d43a6179cd7effea9107c08f03a4af43472df7..abee6b9407fbabb74cf0adb64e1c1b1ab67485eb 100644 (file)
--- a/gcc/tree-ssa-copyrename.c
+++ b/gcc/tree-ssa-copyrename.c
@@ -226,11 +226,11 @@ copy_rename_partition_coalesce (var_map map, tree var1, tree var2, FILE *debug)
       ign2 = false;
     }
 
-  /* Don't coalesce if the two variables aren't type compatible.  */
-  if (!types_compatible_p (TREE_TYPE (root1), TREE_TYPE (root2)))
+  /* Don't coalesce if the two variables are not of the same type.  */
+  if (TREE_TYPE (root1) != TREE_TYPE (root2))
     {
       if (debug)
-       fprintf (debug, " : Incompatible types.  No coalesce.\n");
+       fprintf (debug, " : Different types.  No coalesce.\n");
       return false;
     }