[x265] [PATCH 5 of 8] asm: intra_pred_ang4_6_sse2 improved ~2% 622.50 -> 609.99 with nits and tweaks

[dtyx265 at gmail.com]

# HG changeset patch
# User David T Yuen <dtyx265 at gmail.com>
# Date 1427577282 25200
# Node ID befc4da18fcf11e471a17bb5a58a14d8c6803162
# Parent  c55ff3e7f4842c5bc9ce5fb45b6de2a1bdabcd4c
asm: intra_pred_ang4_6_sse2 improved ~2% 622.50 -> 609.99 with nits and tweaks

Corrected parameter count
Changed r3 and r4 to r3d and r4d
tweaked unpacking for performance

diff -r c55ff3e7f484 -r befc4da18fcf source/common/x86/intrapred8.asm
--- a/source/common/x86/intrapred8.asm	Sat Mar 28 14:06:53 2015 -0700
+++ b/source/common/x86/intrapred8.asm	Sat Mar 28 14:14:42 2015 -0700
@@ -1461,17 +1461,16 @@
     mova        m7, [r3 -  6 * 16]  ; [ 4]
     jmp         mangle(private_prefix %+ _ %+ intra_pred_ang4_3 %+ SUFFIX %+ .do_filter4x4)
 
-cglobal intra_pred_ang4_6, 3,5,8
-    xor         r4, r4
-    inc         r4
+cglobal intra_pred_ang4_6, 4,5,8
+    xor         r4d, r4d
+    inc         r4d
     cmp         r3m, byte 30
-    mov         r3, 9
-    cmove       r3, r4
+    mov         r3d, 9
+    cmove       r3d, r4d
 
     movh        m0, [r2 + r3]    ; [8 7 6 5 4 3 2 1]
-    mova        m1, m0
-    psrldq      m1, 1           ; [x 8 7 6 5 4 3 2]
-    punpcklbw   m0, m1          ; [x 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1]
+    punpcklbw   m0, m0
+    psrldq      m0, 1           ; [x 8 7 6 5 4 3 2]
     mova        m2, m0
     psrldq      m2, 2           ; [x x x x x x x x 6 5 5 4 4 3 3 2]
     punpcklqdq  m0, m0