[x265] [PATCH] blockfill_s_8x8 sse2 asm code optimization

[chen]

At 2015-02-02 16:55:16,praveen at multicorewareinc.com wrote:
># HG changeset patch
># User Praveen Tiwari
># Date 1422867249 -19800
># Branch stable
># Node ID 2618352a21d5917ee8c1f79bcc159e858dd19daa
># Parent  e2c958ff874e2bf8992ba22605e993530e8a2d8c
>blockfill_s_8x8 sse2 asm code optimization
>
>improved, 100.04c -> 90.05c
>
>diff -r e2c958ff874e -r 2618352a21d5 source/common/x86/blockcopy8.asm
>--- a/source/common/x86/blockcopy8.asm	Sat Jan 31 13:48:34 2015 -0600
>+++ b/source/common/x86/blockcopy8.asm	Mon Feb 02 14:24:09 2015 +0530
>@@ -1748,9 +1748,10 @@
> ; void blockfill_s_8x8(int16_t* dst, intptr_t dstride, int16_t val)
> ;-----------------------------------------------------------------------------
> INIT_XMM sse2
>-cglobal blockfill_s_8x8, 3, 3, 1, dst, dstStride, val
>+cglobal blockfill_s_8x8, 3, 4, 1, dst, dstStride, val
> 
> add        r1,            r1
>+lea        r3,            [3 * r1]
> 
> movd       m0,            r2d
> pshuflw    m0,            m0,         0
>@@ -1760,17 +1761,13 @@
> movu       [r0 + r1],     m0
> movu       [r0 + 2 * r1], m0
> 
>-lea        r0,            [r0 + 2 * r1]
>+movu       [r0 + r3],     m0
>+movu       [r0 + 4 * r1], m0
>+
>+lea        r0,            [r0 + 4 * r1]
swap LEA and above movu, you will get less bytes on binary code


> movu       [r0 + r1],     m0
> movu       [r0 + 2 * r1], m0
>-
>-lea        r0,            [r0 + 2 * r1]
>-movu       [r0 + r1],     m0
>-movu       [r0 + 2 * r1], m0
>-
>-lea        r0,            [r0 + 2 * r1]
>-movu       [r0 + r1],     m0
>-
>+movu       [r0 + r3],     m0
> RET
> 
> ;-----------------------------------------------------------------------------
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