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From: "rguenther at suse dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/59409] [4.9 Regression] 253.perlbmk in SPEC CPU 2K is miscompiled
Date: Mon, 09 Dec 2013 09:19:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59409

--- Comment #20 from rguenther at suse dot de <rguenther at suse dot de> ---
On Mon, 9 Dec 2013, hjl.tools at gmail dot com wrote:

> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59409
> 
> H.J. Lu <hjl.tools at gmail dot com> changed:
> 
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>              Status|NEW                         |RESOLVED
>          Resolution|---                         |INVALID
> 
> --- Comment #19 from H.J. Lu <hjl.tools at gmail dot com> ---
> Adding -fno-strict-aliasing fixed the problem.

If using Perl_my_bcopy is the problem then maybe defining
HAS_SAFE_BCOPY will fix it?