[FFmpeg-devel] [PATCH v1] Bug #8027 - Wrong result for FFSIGN(0)

[Ulf Zibis]

Again with the patch attached ...

Am 17.07.19 um 08:30 schrieb Ulf Zibis:
> Hi,
>
> I have a patch for bug #8027 <https://trac.ffmpeg.org/ticket/8027> (see
> attachment).
>
> But there is still a problem with -0.0, but FFABS(-0.0) works fine.
>
> Testcode:
>    av_log(NULL, AV_LOG_ERROR, "FFSIGN(0): %d\n", FFSIGN(0));
>     av_log(NULL, AV_LOG_ERROR, "FFSIGN(-0): %d\n", FFSIGN(-0));
>     av_log(NULL, AV_LOG_ERROR, "FFSIGN(0.0D): %d\n", FFSIGN(0.0D));
>     av_log(NULL, AV_LOG_ERROR, "FFSIGN(-0.0D): %d\n", FFSIGN(-0.0D));
>     av_log(NULL, AV_LOG_ERROR, "FFSIGN(-0.0F): %d\n", FFSIGN(-0.0F));
>     av_log(NULL, AV_LOG_ERROR, "FFSIGN(-0.0): %d\n", FFSIGN(-0.0));
>
>     av_log(NULL, AV_LOG_ERROR, "FFABS(0): %d\n", FFABS(0));
>     av_log(NULL, AV_LOG_ERROR, "FFABS(-0): %d\n", FFABS(-0));
>     av_log(NULL, AV_LOG_ERROR, "FFABS(0.0D): %f\n", FFABS(0.0D));
>     av_log(NULL, AV_LOG_ERROR, "FFABS(-0.0D): %f\n", FFABS(-0.0D));
>     av_log(NULL, AV_LOG_ERROR, "FFABS(-0.0F): %f\n", FFABS(-0.0F));
>     av_log(NULL, AV_LOG_ERROR, "FFABS(-0.0): %f\n", FFABS(-0.0));
>
> Results:
> FFSIGN(0): 1
> FFSIGN(-0): 1
> FFSIGN(0.0D): 1
> FFSIGN(-0.0D): 1
> FFSIGN(-0.0F): 1
> FFSIGN(-0.0): 1
> FFABS(0): 0
> FFABS(-0): 0
> FFABS(0.0D): 0.000000
> FFABS(-0.0D): -0.000000
> FFABS(-0.0F): -0.000000
> FFABS(-0.0): -0.000000
>
> -Ulf
>
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