[Bug tree-optimization/18767] No vectorization for simple loop

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-09-21 
01:33 -------
With -ffast-math on the mainline, we get:
_Z6foobarv:
.LFB2:
        movaps  b(%rip), %xmm1
        mulps   a(%rip), %xmm1
        movaps  %xmm1, %xmm2
        movaps  %xmm1, %xmm0
        shufps  $85, %xmm1, %xmm2
        addss   %xmm2, %xmm0
        movaps  %xmm1, %xmm2
        unpckhps        %xmm1, %xmm2
        shufps  $255, %xmm1, %xmm1
        addss   %xmm2, %xmm0
        addss   %xmm1, %xmm0
        ret



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18767