[FFmpeg-devel] [PATCH] ac3dsp: Change punpckhqdq to movhlps in ac3_max_msb_abs_int16().
Ronald S. Bultje
Wed Feb 16 19:54:13 CET 2011
2011/2/16 Justin Ruggles <justin.ruggles at gmail.com>:
> There really isn't any measurable speed difference, mostly because this is outside the loop, but it makes the intention clearer I think.
> ?libavcodec/x86/ac3dsp.asm | ? ?2 +-
> ?1 files changed, 1 insertions(+), 1 deletions(-)
> @@ -111,7 +111,7 @@ cglobal ac3_max_msb_abs_int16_%1, 2,2,5, src, len
> %ifidn mmsize, 16
> mova m0, m2
> - punpckhqdq m0, m0
> + movhlps m0, m0
> por m2, m0
He meant remove the mova also.
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