[Bug target/56560] [4.6/4.7 regression] vzeroupper clobbers argument with AVX

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56560

--- Comment #2 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2013-03-07 10:17:56 UTC ---
> Confirmed, same code generated on the 4.6 branch.  Works on the 4.5 branch
> where no vzeroupper is inserted.  Likewise no vzeroupper on trunk.

Thanks for confirming.  The vzeroupper pass didn't exist on the 4.5 branch and
has been rewritten to use the mode-switching machinery on mainline.