Hi Martin,

On Aug 1, 2024, at 2:47 AM, Martin Guy <martinwguy@gmail.com> wrote:

Hi!
I'm finding libmad's compilation fails on cfarm230.cfarm.net, an
   EdgeRouter4 (big-endian)
   mips64
   Cavium Octeon III V0.2 FPU V0.0
   Debian 10.13 buster 4.9.79-UBNT_E300
with
   gcc (Debian 8.3.0-6) 8.3.0
saying
   In file included from layer12.c:34:
   layer12.c: In function 'I_sample':
   fixed.h:307:5: error: impossible constraint in 'asm'
        asm ("mult %2,%3" \
        ^~~

It appears FPM_MIPS is not tuned for your architecture. Perhaps someone could suggest a patch?

If I configure with --disable-osa instead I get the same error and it needs
./configure --enable-fpm=default
to work.

Am I missing something, or is that what it should do?

FPM_DEFAULT (--enable-fpm=default) will certainly work, although it doesn’t provide the best accuracy. You could try FPM_64BIT (--enable-fpm=64bit) for better accuracy.