[Libav-user] Runtime ARM Neon detection?
Carl Eugen Hoyos
cehoyos at ag.or.at
Thu Apr 11 18:48:55 CEST 2013
Reuben Scratton <reuben.scratton at ...> writes:
> If I compile with -mfpu=neon then FFmpeg blows up
> with SIGILL (ILLOPTPC) when run on a non-Neon CPU.
> If I compile with -mfpu=vfvp3 then FFmpeg runs fine,
> but presumably without the optimized code
Did you test this? (with a debugger)
I don't know but it seems very unlikely to me that a
compiler option ("-mfpu=vfvp3") affects FFmpeg asm
> Would it be possible for FFmpeg to detect Neon at runtime?
Looking at ff_dsputil_init_arm() in
libavcodec/arm/dsputil_init_arm.c, that is exactly what it
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