On Thu, Jul 18, 2019 at 01:41:02 +0200, Ulf Zibis wrote:
> Given this code snippet:
> float a = 0.0F;
> float b = -0.0F;
> printf("a: %f, signbit(a): %d\n", a, signbit(a));
> printf("b: %f, signbit(b): %d\n", b, signbit(b));
> Result:
> a: 0.000000, signbit(a): 0
> b: -0.000000, signbit(b): 0
> I would expect:
> a: 0.000000, signbit(a): 0
> b: -0.000000, signbit(b): <something not 0>
> ... according to: http://man7.org/linux/man-pages/man3/signbit.3.html
>
> Are there some flags in the your build script which cause this problem?
Obviously "-fno-signed-zeros".
Committed here with an explanation:
https://github.com/FFmpeg/FFmpeg/commit/b2eb2ff098b
It doesn't have an effect with all compilers, apparently. Not sure if
that's important.
Are you developing something use the libav* libraries? Or are you
developing something for inclusion within ffmpeg? At least in the
former case, I recommend the "libav-user" mailing list.
Cheers,
Moritz
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