From: Jason Garrett-Glaser <[email protected]>
Simplifies pshufb masks that operate on words.
---
Ported from x264. LGPL relicense ok'd by Jason on IRC.
libavcodec/x86/dsputil_yasm.asm | 2 +-
libavutil/x86/x86util.asm | 12 ++++++++++++
2 files changed, 13 insertions(+), 1 deletions(-)
diff --git a/libavcodec/x86/dsputil_yasm.asm b/libavcodec/x86/dsputil_yasm.asm
index 07d011d..37467f9 100644
--- a/libavcodec/x86/dsputil_yasm.asm
+++ b/libavcodec/x86/dsputil_yasm.asm
@@ -28,7 +28,7 @@ pb_zzzzzzzz77777777: times 8 db -1
pb_7: times 8 db 7
pb_zzzz3333zzzzbbbb: db -1,-1,-1,-1,3,3,3,3,-1,-1,-1,-1,11,11,11,11
pb_zz11zz55zz99zzdd: db -1,-1,1,1,-1,-1,5,5,-1,-1,9,9,-1,-1,13,13
-pb_revwords: db 14, 15, 12, 13, 10, 11, 8, 9, 6, 7, 4, 5, 2, 3, 0, 1
+pb_revwords: SHUFFLE_MASK_W 7, 6, 5, 4, 3, 2, 1, 0
pd_16384: times 4 dd 16384
pb_bswap32: db 3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12
diff --git a/libavutil/x86/x86util.asm b/libavutil/x86/x86util.asm
index 2ac792f..69b3c82 100644
--- a/libavutil/x86/x86util.asm
+++ b/libavutil/x86/x86util.asm
@@ -638,3 +638,15 @@
shufps %1, %1, 0
%endif
%endmacro
+
+%macro SHUFFLE_MASK_W 8
+ %rep 8
+ %if %1>=0x80
+ db %1, %1
+ %else
+ db %1*2
+ db %1*2+1
+ %endif
+ %rotate 1
+ %endrep
+%endmacro
--
1.7.1
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