[FFmpeg-devel] [PATCH] Altivec split-radix FFT

Guillaume POIRIER poirierg
Mon Aug 31 13:39:56 CEST 2009


On Thu, Aug 27, 2009 at 2:44 PM, Loren Merritt <lorenm at u.washington.edu>wrote:

> Now with MDCT, and tested on PPC64.

I can confirm it works as expected with FSF toolchain, but still fails with
Apple toolchain.

I fixed locally the fact that Apple toolchain doesn't supported named
parameters, but only supports numbered parameters ($0 to $9).

The problem I can't seem to be able to fix is the string concat problem
(i.e. generating symbol names based on the macro's parameters):

gcc-4.2 -arch ppc64 -DHAVE_AV_CONFIG_H -I.
-I"/Users/gpoirier/Prgm/ffmpeg-git" -D_ISOC99_SOURCE
-mcpu=970 -mpowerpc-gfxopt -mpowerpc64 -mdynamic-no-pic -MMD -MF
libavcodec/ppc/fft_altivec_s.d -MT libavcodec/ppc/fft_altivec_s.o -c
-o libavcodec/ppc/fft_altivec_s.o libavcodec/ppc/fft_altivec_s.S
libavcodec/ppc/fft_altivec_s.S:323:Invalid mnemonic 'fft_pass\()_altivec:'
libavcodec/ppc/fft_altivec_s.S:323:Invalid mnemonic 'fft32\()_altivec:'
libavcodec/ppc/fft_altivec_s.S:323:Parameter syntax error (parameter 1)
libavcodec/ppc/fft_altivec_s.S:323:Rest of line ignored. 1st junk
character valued 92 (\).
libavcodec/ppc/fft_altivec_s.S:323:Missing ')' assumed

I found the part of GAS' doc that refers to it:
http://sourceware.org/binutils/docs-2.19/as/Macro.html#MacroBut it looks
like Apple's GAS doesn't support that syntax:

I'll try with spaces as FSF's doc suggests it instead of \() (but Apple
doesn't suggests anything).

Only a very small fraction of our DNA does anything; the rest is all
comments and ifdefs.

Mike Ditka <http://www.brainyquote.com/quotes/authors/m/mike_ditka.html>  -
"If God had wanted man to play soccer, he wouldn't have given us arms."

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