Commit Graph

5 Commits

Author SHA1 Message Date
Loren Merritt
1ee076b1b1 more credits to D. J. Bernstein for fft
Originally committed as revision 24308 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-18 20:06:42 +00:00
Måns Rullgård
a46b84d120 PPC: convert Altivec FFT to pure assembler
On PPC a leaf function has a 288-byte red zone below the stack pointer,
sparing these functions the chore of setting up a full stack frame.

When a function call is disguised within an inline asm block, the
compiler might not adjust the stack pointer as required before a
function call, resulting in the red zone being clobbered.

Moving the entire function to pure asm avoids this problem and also
results in somewhat better code.

Originally committed as revision 24044 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-04 18:33:47 +00:00
Måns Rullgård
deca86eab1 PPC: gas-preprocessor handles m[ft]spr shorthands
Originally committed as revision 24043 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-04 18:33:43 +00:00
Måns Rullgård
a075902f3d PPC: add _interleave versions of fft{4,6,16}_altivec
This removes the need for a post-swizzle with the small FFTs.

Originally committed as revision 24025 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-03 18:36:10 +00:00
Måns Rullgård
bf7ba15372 PPC: Altivec split-radix FFT
1.8x faster than altivec radix-2 on a G4
8% faster vorbis decoding

Patch (mostly) by Loren Merritt

Originally committed as revision 23956 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-01 23:21:39 +00:00