[libav-bugs] [Bug 548] several FATE fft and ifft tests fail on GCC versions prior to 4.6 on PPC with Altivec enabled

bugzilla at libav.org bugzilla at libav.org
Mon Aug 12 19:12:18 CEST 2013


https://bugzilla.libav.org/show_bug.cgi?id=548

--- Comment #4 from lu_zero at gentoo.org <lu_zero at gentoo.org> 2013-08-12 19:12:18 CEST ---
>From fft_altivec_s.S

 * I ignore standard calling convention.
 * Instead, the following registers are treated as global constants:
 * v14: zero
 * v15..v18: cosines
 * v19..v29: permutations
 * r9: 16
 * r12: ff_cos_tabs
 * and the rest are free for local use.

I wonder what uses them in-between.

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