[Bug target/40648] misaligned store vectorizer patch introduced 10% runtime regression on Polyhedron test_fpu

rguenth at gcc dot gnu dot org gcc-bugzilla@gcc.gnu.org
Sat Jul 4 12:36:00 GMT 2009



------- Comment #3 from rguenth at gcc dot gnu dot org  2009-07-04 12:36 -------
Tuned for Core2 I get for the innermost loop

.L19:
        leal    (%eax,%ebx), %edx
        movsd   (%eax,%ecx), %xmm1
        movsd   (%edx), %xmm7
        movhpd  8(%eax,%ecx), %xmm1
        movhpd  8(%edx), %xmm7
        movapd  %xmm1, %xmm0
        incl    %esi
        mulpd   %xmm3, %xmm0
        addl    $16, %eax
        addpd   %xmm7, %xmm0
        cmpl    %edi, %esi
        movlpd  %xmm0, (%edx)
        movhpd  %xmm0, 8(%edx)
        jb      .L19

which is slower than with vectorization disabled (which is what happened
before the patch?).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40648



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