http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49503

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2011.06.22 16:48:48
     Ever Confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> 2011-06-22 16:48:48 
UTC ---
(In reply to comment #0)
> 
> As _L_mutex_lock is a function, GCC generates a prologue and epilogue for it -
> in prologue stack alignment is performed (according to ABI64, stack should be
> aligned to 128-bit).

I didn't see any prologue and epilogue for _L_mutex_lock. Do you have
a run-time testcase to show the problem?

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