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Unroll inner bidir loop in h264_loop_filter_strength_mmx2(), which gets rid

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of the d_idx variable and therefore allows for future optimizations. No speed
difference by this commit itself.

Originally committed as revision 25253 to svn://svn.ffmpeg.org/ffmpeg/trunk
oldabi
Ronald S. Bultje 15 years ago
parent 4b81511cab
commit 2c3135f6d3
1 changed files with 19 additions and 5 deletions
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  1. 24
      libavcodec/x86/h264dsp_mmx.c

24
libavcodec/x86/h264dsp_mmx.c
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@ -86,7 +86,7 @@ static av_always_inline void h264_loop_filter_strength_iteration_mmx2(int16_t bS
"pshufw $0x4E, %%mm2, %%mm3 \n"
"psubb %%mm2, %%mm0 \n" // { ref0[b]!=ref0[bn], ref0[b]!=ref1[bn] }
"psubb %%mm3, %%mm1 \n" // { ref1[b]!=ref1[bn], ref1[b]!=ref0[bn] }
"1: \n"
"por %%mm1, %%mm0 \n"
"movq (%2,%0,4), %%mm1 \n"
"movq 8(%2,%0,4), %%mm2 \n"
@ -103,10 +103,24 @@ static av_always_inline void h264_loop_filter_strength_iteration_mmx2(int16_t bS
"psubusb %%mm5, %%mm1 \n" // abs(mv[b] - mv[bn]) >= limit
"psubusb %%mm5, %%mm3 \n"
"packsswb %%mm3, %%mm1 \n"
"add $40, %0 \n"
"cmp $40, %0 \n"
"jl 1b \n"
"sub $80, %0 \n"
"por %%mm1, %%mm0 \n"
"movq 160(%2,%0,4), %%mm1 \n"
"movq 168(%2,%0,4), %%mm2 \n"
"movq %%mm1, %%mm3 \n"
"movq %%mm2, %%mm4 \n"
"psubw (%2), %%mm1 \n"
"psubw 8(%2), %%mm2 \n"
"psubw 160(%2), %%mm3 \n"
"psubw 168(%2), %%mm4 \n"
"packsswb %%mm2, %%mm1 \n"
"packsswb %%mm4, %%mm3 \n"
"paddb %%mm6, %%mm1 \n"
"paddb %%mm6, %%mm3 \n"
"psubusb %%mm5, %%mm1 \n" // abs(mv[b] - mv[bn]) >= limit
"psubusb %%mm5, %%mm3 \n"
"packsswb %%mm3, %%mm1 \n"
"pshufw $0x4E, %%mm1, %%mm1 \n"
"por %%mm1, %%mm0 \n"
"pshufw $0x4E, %%mm0, %%mm1 \n"

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