[Bug rtl-optimization/57300] [4.8/4.9 Regression] statement in expression miscompiled at -O3 in 32-bit mode

[ebotcazou at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57300

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-05-16
     Ever confirmed|0                           |1

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> I'm worried if this isn't too expensive, as there are just 3 dead_or_set_p
> uses in define_split patterns in the compiler apparently, one in i386.md (the
> one hitting in this and the other PR), guarded with reload_completed, and two
> for movdi splitters in s390.md (not guarded by that).  If the s390.md
> splitters could be guarded by reload_completed, we could at least avoid the
> df_analyze in split1 pass.

I agree that calling DF for just 3 cases sounds a bit overkill.  Is the i386.md
splitter really necessary or could we use a peephole2 instead?