From c3a3d34427498fe32eb81dd80319e401725a85e8 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Tue, 26 Feb 2008 15:52:37 +0000
Subject: [PATCH] Alternative and faster (on gcc x86) plane rotation.

Originally committed as revision 12237 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/faandct.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/libavcodec/faandct.c b/libavcodec/faandct.c
index 35969754db..014c2d7514 100644
--- a/libavcodec/faandct.c
+++ b/libavcodec/faandct.c
@@ -107,9 +107,14 @@ static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data)
         tmp5 += tmp6;
         tmp6 += tmp7;
 
+#if 0
         z5= (tmp4 - tmp6) * A5;
         z2= tmp4*A2 + z5;
         z4= tmp6*A4 + z5;
+#else
+        z2= tmp4*(A2+A5) - tmp6*A5;
+        z4= tmp6*(A4-A5) + tmp4*A5;
+#endif
         tmp5*=A1;
 
         z11= tmp7 + tmp5;
@@ -161,9 +166,14 @@ void ff_faandct(DCTELEM * data)
         tmp5 += tmp6;
         tmp6 += tmp7;
 
+#if 0
         z5= (tmp4 - tmp6) * A5;
         z2= tmp4*A2 + z5;
         z4= tmp6*A4 + z5;
+#else
+        z2= tmp4*(A2+A5) - tmp6*A5;
+        z4= tmp6*(A4-A5) + tmp4*A5;
+#endif
         tmp5*=A1;
 
         z11= tmp7 + tmp5;