[Bug rtl-optimization/47614] [4.6 Regression] cpu2000 benchmark 301.apsi fails with revision 169782

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47614

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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  Attachment #23288|0                           |1
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--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-02-09 18:48:46 UTC ---
Created attachment 23289
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23289
gcc46-pr47614-2.patch

Actually, the second patch is not enough, we don't delete the insn in that
case, but still reload_cse_simplify_operands optimizes the MEM into a register,
ignoring its side-effects.
I think this should work.  Alternatively, if we go the first patch route, I
think side_effects_p guard in reload_cse_simplify_operands is still desirable.