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Alternative and faster (on gcc x86) plane rotation.

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Originally committed as revision 12237 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-02-26 15:52:37 +00:00
parent 8af4d0fc8d
commit c3a3d34427
1 changed files with 10 additions and 0 deletions
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10
libavcodec/faandct.c
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@ -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;