[x265] [PATCH] blockcopy_pp_2x16 SSE2 asm code: optimization

[chen]

right


At 2015-02-05 17:25:05,praveen at multicorewareinc.com wrote:
># HG changeset patch
># User Praveen Tiwari
># Date 1423128295 -19800
># Node ID 1265aafe5af1d66b8151ffd9bdc6fe595f7e6343
># Parent  6843cdeae82b7429eedee297c33b0eb6b49401a2
>blockcopy_pp_2x16 SSE2 asm code: optimization
>
>reduced LEA instructions and eliminated branch instructions
>improved, 310.94c -> 268.89c
>
>diff -r 6843cdeae82b -r 1265aafe5af1 source/common/x86/blockcopy8.asm
>--- a/source/common/x86/blockcopy8.asm	Thu Feb 05 14:46:54 2015 +0530
>+++ b/source/common/x86/blockcopy8.asm	Thu Feb 05 14:54:55 2015 +0530
>@@ -93,16 +93,30 @@
> ;-----------------------------------------------------------------------------
> INIT_XMM sse2
> cglobal blockcopy_pp_2x16, 4, 7, 0
>-    mov     r6d,    16/2
>-.loop:
>-    mov     r4w,    [r2]
>-    mov     r5w,    [r2 + r3]
>-    dec     r6d
>-    lea     r2,     [r2 + r3 * 2]
>-    mov     [r0],       r4w
>-    mov     [r0 + r1],  r5w
>-    lea     r0,     [r0 + r1 * 2]
>-    jnz     .loop
>+    lea     r5,      [3 * r1]
>+    lea     r6,      [3 * r3]
>+
>+    mov     r4w,           [r2]
>+    mov     [r0],          r4w
>+    mov     r4w,           [r2 + r3]
>+    mov     [r0 + r1],     r4w
>+    mov     r4w,           [r2 + 2 * r3]
>+    mov     [r0 + 2 * r1], r4w
>+    mov     r4w,           [r2 + r6]
>+    mov     [r0 + r5],     r4w
>+
>+%rep 3
>+    lea     r2,            [r2 + 4 * r3]
>+    mov     r4w,           [r2]
>+    lea     r0,            [r0 + 4 * r1]
>+    mov     [r0],          r4w
>+    mov     r4w,           [r2 + r3]
>+    mov     [r0 + r1],     r4w
>+    mov     r4w,           [r2 + 2 * r3]
>+    mov     [r0 + 2 * r1], r4w
>+    mov     r4w,           [r2 + r6]
>+    mov     [r0 + r5],     r4w
>+%endrep
>     RET
> 
> 
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