From 7d243701d986b8b7fa2d3148e7a09b52cffd272a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philip=20J=C3=A4genstedt?= <philipj@opera.com>
Date: Tue, 13 Jul 2010 11:43:51 +0200
Subject: [PATCH] Replace pinsrw (SSE) with MMX instructions
Fixes http://code.google.com/p/webm/issues/detail?id=136
Change-Id: I5a3e294061644a1a9718e8ba4a39548ede25cc42
---
vp8/decoder/x86/dequantize_mmx.asm | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/vp8/decoder/x86/dequantize_mmx.asm b/vp8/decoder/x86/dequantize_mmx.asm
index 7ad9289cc2..f11eef35a7 100644
--- a/vp8/decoder/x86/dequantize_mmx.asm
+++ b/vp8/decoder/x86/dequantize_mmx.asm
@@ -261,8 +261,6 @@ sym(vp8_dequant_dc_idct_add_mmx):
mov rax, arg(0) ;input
mov rdx, arg(1) ;dq
- movsxd rcx, dword ptr arg(6) ;Dc
-
movq mm0, [rax ]
pmullw mm0, [rdx]
@@ -286,8 +284,13 @@ sym(vp8_dequant_dc_idct_add_mmx):
movq [rax+16],mm7
movq [rax+24],mm7
+ ; move lower word of Dc to lower word of mm0
+ psrlq mm0, 16
+ movzx rcx, word ptr arg(6) ;Dc
+ psllq mm0, 16
+ movd mm7, rcx
+ por mm0, mm7
- pinsrw mm0, rcx, 0
movsxd rax, dword ptr arg(4) ;pitch
movsxd rdi, dword ptr arg(5) ;stride
--
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