------- Comment #1 from ubizjak at gmail dot com  2010-08-19 06:49 -------
It is just insn preferences for IX86_TUNE_PARTIAL_REG_STALL. We are not testing
this flag but move insn, so can you please test:

Index: volatile-bitfields-1.c
===================================================================
--- volatile-bitfields-1.c      (revision 163363)
+++ volatile-bitfields-1.c      (working copy)
@@ -14,4 +14,4 @@
   return bits.b;
 }

-/* { dg-final { scan-assembler "movzbl.*bits" } } */
+/* { dg-final { scan-assembler "mov(zbl|b).*bits" } } */

The patch is pre-approved if it solves your failure.


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2010-08-19 06:49:24
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45324

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