[Webkit-unassigned] [Bug 77950] SSE optimization for vsvesq and vmaxmgv
bugzilla-daemon at webkit.org
bugzilla-daemon at webkit.org
Fri Feb 24 21:41:43 PST 2012
https://bugs.webkit.org/show_bug.cgi?id=77950
--- Comment #12 from xingnan.wang at intel.com 2012-02-24 21:41:43 PST ---
(In reply to comment #10)
> (From update of attachment 128369 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=128369&action=review
>
> >> Source/WebCore/platform/audio/VectorMath.cpp:500
> >> + source = _mm_and_ps(source, mMask);
> >
> > You mentioned that the performance with and_ps is less than the previous version with min_ps. Is this because and_ps is slower or maybe because of some pipelining isues? I'm just curious as to why this is slower.
>
> It`s not slower with and_ps, my expression may not be clear so sorry for misleading you. I mean the performance between using and_ps and min_ps is not too much different, so I think the performance data is no needed to be updated.
>
> >> Source/WebCore/platform/audio/VectorMath.cpp:508
> >> + max = std::max(groupMaxP[2], groupMaxP[3]);
> >
> > The assignment to max here at line 508 overwrites the max computed in line 485 when the source is not aligned. This needs to be rearranged a little so as not to destroy that.
>
> I`ll fix it.
Fixed.
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