diff options
| author | James Darnley <jdarnley@obe.tv> | 2022-12-15 11:19:30 +0100 |
|---|---|---|
| committer | James Darnley <jdarnley@obe.tv> | 2022-12-20 15:02:45 +0100 |
| commit | f30b4c2f47ab689a570a9b36b2e96e78bb462691 (patch) | |
| tree | 15ca460d4c5b7778c8d5fe53d909abf816b1870e /libavcodec | |
| parent | f1f41d6ff5fdfc993e69972c074584efa56012ee (diff) | |
avcodec/x86/v210: add some comments to the improved avx2 function
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/x86/v210.asm | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/libavcodec/x86/v210.asm b/libavcodec/x86/v210.asm index 3b9e0761df..600a4ddc5f 100644 --- a/libavcodec/x86/v210.asm +++ b/libavcodec/x86/v210.asm @@ -65,18 +65,18 @@ cglobal v210_planar_unpack_%1, 5, 5, 6 + 2 * cpuflag(avx2), src, y, u, v, w mova m0, [srcq] %endif - pmullw m1, m0, m3 - pslld m0, 12 - psrlw m1, 6 ; yB yA u5 v4 y8 y7 v3 u3 y5 y4 u2 v1 y2 y1 v0 u0 - psrld m0, 22 ; 00 v5 00 y9 00 u4 00 y6 00 v2 00 y3 00 u1 00 y0 + pmullw m1, m0, m3 ; shifts the 1st and 3rd sample of each dword into the high 10 bits of each word + pslld m0, 12 ; shifts the 2nd sample of each dword into the high 10 bits of each dword + psrlw m1, 6 ; shifts the 1st and 3rd samples back into the low 10 bits + psrld m0, 22 ; shifts the 2nd sample back into the low 10 bits of each dword %if cpuflag(avx2) - vpblendd m2, m1, m0, 0x55 ; yB yA 00 y9 y8 y7 00 y6 y5 y4 00 y3 y2 y1 00 y0 + vpblendd m2, m1, m0, 0x55 ; merge the odd dwords from m0 and even from m1 ; yB yA 00 y9 y8 y7 00 y6 y5 y4 00 y3 y2 y1 00 y0 pshufb m2, m4 ; 00 00 yB yA y9 y8 y7 y6 00 00 y5 y4 y3 y2 y1 y0 vpermd m2, m6, m2 ; 00 00 00 00 yB yA y9 y8 y7 y6 y5 y4 y3 y2 y1 y0 movu [yq+2*wq], m2 - vpblendd m1, m1, m0, 0xaa ; 00 v5 u5 v4 00 u4 v3 u3 00 v2 u2 v1 00 u1 v0 u0 + vpblendd m1, m1, m0, 0xaa ; merge the even dwords from m0 and odd from m1 ; 00 v5 u5 v4 00 u4 v3 u3 00 v2 u2 v1 00 u1 v0 u0 pshufb m1, m5 ; 00 v5 v4 v3 00 u5 u4 u3 00 v2 v1 v0 00 u2 u1 u0 vpermq m1, m1, 0xd8 ; 00 v5 v4 v3 00 v2 v1 v0 00 u5 u4 u3 00 u2 u1 u0 pshufb m1, m7 ; 00 00 v5 v4 v3 v2 v1 v0 00 00 u5 u4 u3 u2 u1 u0 |