On  27 Aug, this message from Kaoru Fukui echoed through cyberspace:

quoted

I've sat down a bit ;-) and came up with an Altivec-optimised IDCT

I don't know much.
Altivec-gcc need "-fvec" as gcc option.

It's not altivec-enabled gcc; just plain asm which the assembler knows
about (if you pass the right option which I'm doing ;-).

Cheers

Michel

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