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avcodec/x86/videodsp: Small speedups in ff_emulated_edge_mc x86 SIMD. 

Don't use word-size multiplications if size == 2, and if we're using
SIMD instructions (size >= 8), complete leftover 4byte sets using movd,
not mov. Both of these changes lead to minor speedups.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Ronald S. Bultje 2013-10-26 08:24:09 -04:00 committed by Michael Niedermayer
parent cd86eb265f
commit 960490c0b2
1 changed files with 17 additions and 17 deletions
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34
libavcodec/x86/videodsp.asm
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@ -344,10 +344,6 @@ VERTICAL_EXTEND 16, 22
; obviously not the same on both sides.
%macro READ_V_PIXEL 2
%if %1 == 2
movzx valw, byte %2
imul valw, 0x0101
%else
movzx vald, byte %2
imul vald, 0x01010101
%if %1 >= 8
@ -356,13 +352,15 @@ VERTICAL_EXTEND 16, 22
pshufd m0, m0, q0000
%else
punpckldq m0, m0
%endif
%endif ; %1 >= 8
%endif
%endif ; mmsize == 16
%endif ; %1 > 16
%endmacro ; READ_V_PIXEL
%macro WRITE_V_PIXEL 2
%assign %%off 0
%if %1 >= 8
%rep %1/mmsize
movu [%2+%%off], m0
%assign %%off %%off+mmsize
@ -378,27 +376,29 @@ VERTICAL_EXTEND 16, 22
%assign %%off %%off+8
%endif
%endif ; %1-%%off >= 8
%endif
%endif ; mmsize == 16
%if %1-%%off >= 4
%if %1 > 8 && %1-%%off > 4
movq [%2+%1-8], m0
%assign %%off %1
%elif %1 >= 8 && %1-%%off >= 4
movd [%2+%%off], m0
%assign %%off %%off+4
%else
mov [%2+%%off], vald
movd [%2+%%off], m0
%assign %%off %%off+4
%endif
%endif ; %1-%%off >= 4
%if %1-%%off >= 2
%if %1 >= 8
movd [%2+%1-4], m0
%else
%else ; %1 < 8
%rep %1/4
mov [%2+%%off], vald
%assign %%off %%off+4
%endrep ; %1/4
%endif ; %1 >=/< 8
%if %1-%%off == 2
mov [%2+%%off], valw
%endif
%endif ; (%1-%%off)/2
%endmacro ; WRITE_V_PIXEL