[x265] [PATCH Review only] asm: pixel_add_pp routine for 16x4 block size

[murugan at multicorewareinc.com]

# HG changeset patch
# User Murugan Vairavel <murugan at multicorewareinc.com>
# Date 1383718677 -19800
#      Wed Nov 06 11:47:57 2013 +0530
# Node ID d8385d7126cb3e32a19661f50a9dd850bfdc8b39
# Parent  6b08828ab11c4b5e0244faea9187f162d04e615c
asm: pixel_add_pp routine for 16x4 block size

diff -r 6b08828ab11c -r d8385d7126cb source/common/x86/pixel-add8.asm
--- a/source/common/x86/pixel-add8.asm	Wed Nov 06 11:37:33 2013 +0530
+++ b/source/common/x86/pixel-add8.asm	Wed Nov 06 11:47:57 2013 +0530
@@ -298,3 +298,40 @@
 PIXELADD_PP_W8_H4 8, 16
 PIXELADD_PP_W8_H4 8, 32
 
+;-----------------------------------------------------------------------------
+; void pixel_add_pp_c_16x4(pixel *dest, intptr_t destride, pixel *src0, pixel *src1, intptr_t srcstride0, intptr_t srcstride1);
+;-----------------------------------------------------------------------------
+INIT_XMM sse2
+cglobal pixel_add_pp_16x4, 4, 6, 8, dest, deststride, src0, src1
+
+mov        r4d,        r4m
+mov        r5d,        r5m
+
+movu       m0,    [r2]
+movu       m1,    [r3]
+
+movu       m2,    [r2 + r4]
+movu       m3,    [r3 + r5]
+
+movu       m4,    [r2 + 2 * r4]
+movu       m5,    [r3 + 2 * r5]
+
+lea        r2,    [r2 + 2 * r4]
+lea        r3,    [r3 + 2 * r5]
+
+movu       m6,    [r2 +  r4]
+movu       m7,    [r3 +  r5]
+
+paddusb    m0,    m1
+paddusb    m2,    m3
+paddusb    m4,    m5
+paddusb    m6,    m7
+
+movu    [r0],             m0
+movu    [r0 + r1],        m2
+movu    [r0 + 2 * r1],    m4
+
+lea     r0,               [r0 + 2 * r1]
+movu    [r0 + r1],        m6
+
+RET