[Bug rtl-optimization/47379] fwprop1 generates bad codes for x86-64

[egallager at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47379

Eric Gallager <egallager at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |egallager at gcc dot gnu.org

--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #5)
> (In reply to comment #4)
> > Can you try after:
> > 2011-12-19  Richard Sandiford  <rdsandiford@googlemail.com>
> > 
> >         PR rtl-optimization/42839
> >         * fwprop.c (forward_propagate_subreg): Skip the SIGN/ZERO_EXTEND
> >         optimization if the source register is already extended.
> 
> GCC 4.7.0 20120131 still does it.

4.7.0 branch is closed now, could you try a branch that's still open now?