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avutil/pixelutils: faster pixelutils_sad_[au]_16x16

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~560 → ~500 decicycles

This is following the comments from Michael in
https://ffmpeg.org/pipermail/ffmpeg-devel/2014-August/160599.html

Using 2 registers for accumulator didn't help. On the other hand,
some re-ordering between the movs and psadbw allowed going ~538 to ~500.
This commit is contained in:
Clément Bœsch 2014-08-14 22:30:55 +02:00
parent c82a288f87
commit 45c7f3997e
1 changed files with 9 additions and 5 deletions
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14
libavutil/x86/pixelutils.asm
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@ -134,16 +134,20 @@ cglobal pixelutils_sad_16x16, 4,4,5, src1, stride1, src2, stride2
%macro SAD_XMM_16x16 1
INIT_XMM sse2
cglobal pixelutils_sad_%1_16x16, 4,4,3, src1, stride1, src2, stride2
pxor m2, m2
%rep 8
mov%1 m0, [src2q]
mov%1 m2, [src2q]
psadbw m2, [src1q]
mov%1 m1, [src2q + stride2q]
psadbw m1, [src1q + stride1q]
paddw m2, m1
%rep 7
lea src1q, [src1q + 2*stride1q]
lea src2q, [src2q + 2*stride2q]
mov%1 m0, [src2q]
psadbw m0, [src1q]
mov%1 m1, [src2q + stride2q]
psadbw m1, [src1q + stride1q]
paddw m2, m0
paddw m2, m1
lea src1q, [src1q + 2*stride1q]
lea src2q, [src2q + 2*stride2q]
%endrep
movhlps m0, m2
paddw m2, m0