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| author | Jason Garrett-Glaser <jason@x264.com> | 2011-07-26 19:08:05 -0700 |
|---|---|---|
| committer | Jason Garrett-Glaser <jason@x264.com> | 2011-07-28 13:06:13 -0700 |
| commit | 6c3257654801d525aa61e6fb46022a2a3b12c074 (patch) | |
| tree | 8777edbbe56440b243395f4fc5f2534e0d384af8 /libavcodec/x86/cabac.h | |
| parent | 8dcf5184307f072d55fb29373be05ef8b0fd02df (diff) | |
| download | ffmpeg-6c3257654801d525aa61e6fb46022a2a3b12c074.tar.gz | |
H.264: optimize CABAC x86 asm for Atom
Diffstat (limited to 'libavcodec/x86/cabac.h')
| -rw-r--r-- | libavcodec/x86/cabac.h | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/libavcodec/x86/cabac.h b/libavcodec/x86/cabac.h index 52bea9c53d..1ad74ff3e0 100644 --- a/libavcodec/x86/cabac.h +++ b/libavcodec/x86/cabac.h @@ -34,8 +34,8 @@ "cmova %%ecx , "range" \n\t"\ "sbb %%ecx , %%ecx \n\t"\ "and %%ecx , "tmp" \n\t"\ - "sub "tmp" , "low" \n\t"\ - "xor %%ecx , "ret" \n\t" + "xor %%ecx , "ret" \n\t"\ + "sub "tmp" , "low" \n\t" #else /* HAVE_FAST_CMOV */ #define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\ "mov "tmp" , %%ecx \n\t"\ @@ -62,21 +62,20 @@ "movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\ "shl %%cl , "range" \n\t"\ "movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\ - "mov "tmpbyte" , "statep" \n\t"\ "shl %%cl , "low" \n\t"\ + "mov "tmpbyte" , "statep" \n\t"\ "test "lowword" , "lowword" \n\t"\ " jnz 1f \n\t"\ "mov "byte"("cabac"), %%"REG_c" \n\t"\ + "add $2 , "byte "("cabac") \n\t"\ "movzwl (%%"REG_c") , "tmp" \n\t"\ - "bswap "tmp" \n\t"\ - "shr $15 , "tmp" \n\t"\ - "sub $0xFFFF , "tmp" \n\t"\ - "add $2 , %%"REG_c" \n\t"\ - "mov %%"REG_c" , "byte "("cabac") \n\t"\ "lea -1("low") , %%ecx \n\t"\ "xor "low" , %%ecx \n\t"\ "shr $15 , %%ecx \n\t"\ + "bswap "tmp" \n\t"\ + "shr $15 , "tmp" \n\t"\ "movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\ + "sub $0xFFFF , "tmp" \n\t"\ "neg %%ecx \n\t"\ "add $7 , %%ecx \n\t"\ "shl %%cl , "tmp" \n\t"\ |