Commit Graph

5 Commits

Author SHA1 Message Date
Jason Garrett-Glaser
19fb234e4a H.264: split luma dc idct out and implement MMX/SSE2 versions
About 2.5x the speed.

NOTE: the way that the asm code handles large qmuls is a bit suboptimal.
If x264-style dequant was used (separate shift and qmul values), it might
be possible to get some extra speed.

Originally committed as revision 26336 to svn://svn.ffmpeg.org/ffmpeg/trunk
2011-01-14 21:34:25 +00:00
Reimar Döffinger
02b424d9c8 Add d suffix to movd target register to make it work with nasm.
Originally committed as revision 25206 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-09-26 09:15:18 +00:00
Ronald S. Bultje
ae11291865 Unroll loop in h264_idct_add16intra_sse2(). Basically identical to r25171, this
inlines scan8[] and removes loop setup. 15% faster, 0.4% overall.

See "[PATCH] unroll loop in h264_idct_add8_sse2()" thread on ML.

Originally committed as revision 25172 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-09-24 14:07:23 +00:00
Ronald S. Bultje
4bca677494 Unroll loop in h264_idct_add8_sse2(). This means we can inline scan8[] in the
code directly also and remove loop setup. 20% faster in function, 0.8% overall.

See "[PATCH] unroll loop in h264_idct_add8_sse2()" thread on ML.

Originally committed as revision 25171 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-09-24 14:05:45 +00:00
Ronald S. Bultje
1d16a1cf99 Rename h264_idct_sse2.asm to h264_idct.asm; move inline IDCT asm from
h264dsp_mmx.c to h264_idct.asm (as yasm code). Because the loops are now
coded in asm instead of C, this is (depending on the function) up to 50%
faster for cases where gcc didn't do a great job at looping.

Since h264_idct_add8() is now faster than the manual loop setup in h264.c,
in-asm idct calling can now be enabled for chroma as well (see r16207). For
MMX, this is 5% faster. For SSE2 (which isn't done for chroma if h264.c does
the looping), this makes it up to 50% faster. Speed gain overall is ~0.5-1.0%.

Originally committed as revision 25119 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-09-14 13:36:26 +00:00