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Subject: [Bug middle-end/53708] [4.8 Regression] Many failures of the objc tests with -O3 -fnext-runtime and -m32
Date: Mon, 18 Jun 2012 08:52:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53708

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.8.0

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-06-18 08:51:33 UTC ---
I suppose vect_can_force_dr_alignment_p should be restricted more.  Can you
try

Index: gcc/tree-vect-data-refs.c
===================================================================
--- gcc/tree-vect-data-refs.c   (revision 188662)
+++ gcc/tree-vect-data-refs.c   (working copy)
@@ -4731,6 +4720,12 @@ vect_can_force_dr_alignment_p (const_tre
   if (TREE_ASM_WRITTEN (decl))
     return false;

+  /* Do not override explicit alignment set by the user or the alignment
+     as specified by the ABI when the used attribute is set.  */
+  if (DECL_USER_ALIGN (decl)
+      || DECL_PRESERVE_P (decl))
+    return false;
+
   if (TREE_STATIC (decl))
     return (alignment <= MAX_OFILE_ALIGNMENT);
   else

ok if it passes bootstrap & regtesting for you.