From 51f0ac65df62c8da804f2e995c38ab9adaf32b9b Mon Sep 17 00:00:00 2001
From: Loren Merritt <lorenm@u.washington.edu>
Date: Sun, 3 Feb 2008 03:21:47 +0000
Subject: [PATCH] remove some movq in ff_h264_idct8_add_mmx. 225->217 cycles on
core2.
Originally committed as revision 11825 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/i386/h264dsp_mmx.c | 52 ++++++++++++++++-------------------
1 file changed, 23 insertions(+), 29 deletions(-)
diff --git a/libavcodec/i386/h264dsp_mmx.c b/libavcodec/i386/h264dsp_mmx.c
index 1ecb0cbef11..8d96ba7f1fc 100644
--- a/libavcodec/i386/h264dsp_mmx.c
+++ b/libavcodec/i386/h264dsp_mmx.c
@@ -94,44 +94,38 @@ static inline void h264_idct8_1d(int16_t *block)
{
asm volatile(
"movq 112(%0), %%mm7 \n\t"
- "movq 80(%0), %%mm5 \n\t"
+ "movq 80(%0), %%mm0 \n\t"
"movq 48(%0), %%mm3 \n\t"
- "movq 16(%0), %%mm1 \n\t"
+ "movq 16(%0), %%mm5 \n\t"
- "movq %%mm7, %%mm4 \n\t"
- "movq %%mm3, %%mm6 \n\t"
- "movq %%mm5, %%mm0 \n\t"
- "movq %%mm7, %%mm2 \n\t"
+ "movq %%mm0, %%mm4 \n\t"
+ "movq %%mm5, %%mm1 \n\t"
"psraw $1, %%mm4 \n\t"
- "psraw $1, %%mm6 \n\t"
- "psubw %%mm7, %%mm0 \n\t"
- "psubw %%mm6, %%mm2 \n\t"
- "psubw %%mm4, %%mm0 \n\t"
- "psubw %%mm3, %%mm2 \n\t"
- "psubw %%mm3, %%mm0 \n\t"
- "paddw %%mm1, %%mm2 \n\t"
-
- "movq %%mm5, %%mm4 \n\t"
- "movq %%mm1, %%mm6 \n\t"
- "psraw $1, %%mm4 \n\t"
- "psraw $1, %%mm6 \n\t"
- "paddw %%mm5, %%mm4 \n\t"
- "paddw %%mm1, %%mm6 \n\t"
+ "psraw $1, %%mm1 \n\t"
+ "paddw %%mm0, %%mm4 \n\t"
+ "paddw %%mm5, %%mm1 \n\t"
"paddw %%mm7, %%mm4 \n\t"
- "paddw %%mm5, %%mm6 \n\t"
- "psubw %%mm1, %%mm4 \n\t"
- "paddw %%mm3, %%mm6 \n\t"
+ "paddw %%mm0, %%mm1 \n\t"
+ "psubw %%mm5, %%mm4 \n\t"
+ "paddw %%mm3, %%mm1 \n\t"
+
+ "psubw %%mm3, %%mm5 \n\t"
+ "psubw %%mm3, %%mm0 \n\t"
+ "paddw %%mm7, %%mm5 \n\t"
+ "psubw %%mm7, %%mm0 \n\t"
+ "psraw $1, %%mm3 \n\t"
+ "psraw $1, %%mm7 \n\t"
+ "psubw %%mm3, %%mm5 \n\t"
+ "psubw %%mm7, %%mm0 \n\t"
- "movq %%mm0, %%mm1 \n\t"
"movq %%mm4, %%mm3 \n\t"
- "movq %%mm2, %%mm5 \n\t"
- "movq %%mm6, %%mm7 \n\t"
- "psraw $2, %%mm6 \n\t"
+ "movq %%mm1, %%mm7 \n\t"
+ "psraw $2, %%mm1 \n\t"
"psraw $2, %%mm3 \n\t"
+ "paddw %%mm5, %%mm3 \n\t"
"psraw $2, %%mm5 \n\t"
+ "paddw %%mm0, %%mm1 \n\t"
"psraw $2, %%mm0 \n\t"
- "paddw %%mm6, %%mm1 \n\t"
- "paddw %%mm2, %%mm3 \n\t"
"psubw %%mm4, %%mm5 \n\t"
"psubw %%mm0, %%mm7 \n\t"
--
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