[Bug tree-optimization/32825] Reduction with nonzero start (arbitrary also) causes an extra add to happen

pinskia at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Sat Jan 28 03:18:00 GMT 2012


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32825

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-01-28
     Ever Confirmed|0                           |1

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-01-28 03:03:51 UTC ---
Even on x86, it is just as fast to generate {0,0,0,0} as it is {e,0,0,0}:
    movd    %edi, %xmm0
or:
    xorps    %xmm1, %xmm1
    movss    %xmm0, %xmm1
    movaps    %xmm1, %xmm0



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