[x265] [PATCH] blockfill_s_16x16 sse2 asm code optimization

[praveen at multicorewareinc.com]

# HG changeset patch
# User Praveen Tiwari
# Date 1422877414 -19800
# Branch stable
# Node ID 8d03acd70332ccf642fc7222bf6f9e7f005983ba
# Parent  8e1f8ca9d4112d8ad9801bf79518482306ff55ce
blockfill_s_16x16 sse2 asm code optimization

eliminated branch instructions and optimized LEA instruction

diff -r 8e1f8ca9d411 -r 8d03acd70332 source/common/x86/blockcopy8.asm
--- a/source/common/x86/blockcopy8.asm	Mon Feb 02 17:03:40 2015 +0530
+++ b/source/common/x86/blockcopy8.asm	Mon Feb 02 17:13:34 2015 +0530
@@ -1771,57 +1771,58 @@
 RET
 
 ;-----------------------------------------------------------------------------
-; void blockfill_s_%1x%2(int16_t* dst, intptr_t dstride, int16_t val)
+; void blockfill_s_16x16(int16_t* dst, intptr_t dstride, int16_t val)
 ;-----------------------------------------------------------------------------
-%macro BLOCKFILL_S_W16_H8 2
 INIT_XMM sse2
-cglobal blockfill_s_%1x%2, 3, 5, 1, dst, dstStride, val
-
-mov        r3d,           %2/8
+cglobal blockfill_s_16x16, 3, 4, 1, dst, dstStride, val
 
 add        r1,            r1
+lea        r3,            [3 * r1]
 
 movd       m0,            r2d
-pshuflw    m0,            m0,       0
-pshufd     m0,            m0,       0
-
-.loop:
-     movu       [r0],               m0
-     movu       [r0 + 16],          m0
-
-     movu       [r0 + r1],          m0
-     movu       [r0 + r1 + 16],     m0
-
-     movu       [r0 + 2 * r1],      m0
-     movu       [r0 + 2 * r1 + 16], m0
-
-     lea        r4,                 [r0 + 2 * r1]
-     movu       [r4 + r1],          m0
-     movu       [r4 + r1 + 16],     m0
-
-     movu       [r0 + 4 * r1],      m0
-     movu       [r0 + 4 * r1 + 16], m0
-
-     lea        r4,                 [r0 + 4 * r1]
-     movu       [r4 + r1],          m0
-     movu       [r4 + r1 + 16],     m0
-
-     movu       [r4 + 2 * r1],      m0
-     movu       [r4 + 2 * r1 + 16], m0
-
-     lea        r4,                 [r4 + 2 * r1]
-     movu       [r4 + r1],          m0
-     movu       [r4 + r1 + 16],     m0
-
-     lea        r0,                 [r0 + 8 * r1]
-
-     dec        r3d
-     jnz        .loop
-
+pshuflw    m0,            m0,         0
+pshufd     m0,            m0,         0
+
+movu       [r0],           m0
+movu       [r0 + 16],      m0
+movu       [r0 + r1],      m0
+movu       [r0 + r1 + 16], m0
+movu       [r0 + 2 * r1],  m0
+movu       [r0 + 2 * r1 + 16], m0
+
+movu       [r0 + r3],          m0
+movu       [r0 + r3 + 16],     m0
+lea        r0,                 [r0 + 4 * r1]
+movu       [r0],               m0
+movu       [r0 + 16],          m0
+
+movu       [r0 + r1],          m0
+movu       [r0 + r1 + 16],     m0
+movu       [r0 + 2 * r1],      m0
+movu       [r0 + 2 * r1 + 16], m0
+movu       [r0 + r3],          m0
+movu       [r0 + r3 + 16],     m0
+lea        r0,                 [r0 + 4 * r1]
+movu       [r0],               m0
+movu       [r0 + 16],          m0
+
+movu       [r0 + r1],          m0
+movu       [r0 + r1 + 16],     m0
+movu       [r0 + 2 * r1],      m0
+movu       [r0 + 2 * r1 + 16], m0
+movu       [r0 + r3],          m0
+movu       [r0 + r3 + 16],     m0
+lea        r0,                 [r0 + 4 * r1]
+movu       [r0],               m0
+movu       [r0 + 16],          m0
+
+movu       [r0 + r1],          m0
+movu       [r0 + r1 + 16],     m0
+movu       [r0 + 2 * r1],      m0
+movu       [r0 + 2 * r1 + 16], m0
+movu       [r0 + r3],          m0
+movu       [r0 + r3 + 16],     m0
 RET
-%endmacro
-
-BLOCKFILL_S_W16_H8 16, 16
 
 INIT_YMM avx2
 cglobal blockfill_s_16x16, 3, 4, 1