[x264-devel] Wrong instruction

[SIEGERSTEIN]

В сообщении от Tuesday 23 October 2007 21:04:37 Loren Merritt написал(а):
> On Tue, 23 Oct 2007, SIEGERSTEIN wrote:
> > On Tue, 23 Oct 2007, Guillaume Poirier wrote:
> >> On Tue, 23 Oct 2007, SIEGERSTEIN wrote:
> >>> Hi! I found, that x264 encoder convert with wrong instruction:
> >>> Program received signal SIGFPE, Arithmetic exception.
>
> A wrong instruction would be SIGILL, not SIGFPE.
>
> My guess: transcode managed to enable floating-point exceptions, such
> that division by zero becomes a crash rather than infinity.
> The crash is near a division, and the denominator can be zero with some
> settings, but the result of that computation won't be used in the cases
> where it is zero, so inf or NaN don't matter.
>
> >> MMXExt is supported by your CPU. Your problem must be elsewhere.
> >
> > Where you see MMXEXT suport in my processor ?!?
> > I see only SSE, SSE2, SSE3(pni) and MMX instructions.
> >
> > MMXEXT is exclusive to AMD processors.
>
> SSE is Intel's name for MMXEXT. Or if you prefer, MMXEXT is AMD's name for
> a subset of SSE. In any case, x264 doesn't have any AMD-specific code.
> 3DNow detection is there only because we can detect it, not because it's
> used.
>
> --Loren Merritt
>
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ok, understand.
Thanks for powerfull answer.

Best regards,