From c3a3d34427498fe32eb81dd80319e401725a85e8 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 26 Feb 2008 15:52:37 +0000 Subject: 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(+) (limited to 'libavcodec/faandct.c') 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; -- cgit v1.2.3