ffast-math disables signed zero by design I think... I'm particularly interested in problems of numeric stability and loss of dynamic range.
--Albin On Mon, Sep 2, 2019, 15:27 Johannes Demel <de...@ant.uni-bremen.de> wrote: > Hi Albin, > > one of my students reported a little oddity about `-ffast-math`. Assume > you want to set a float to -0, i.e. set the sign bit only. In this case > `-ffast-math` seems to remove the sign bit. > > In VOLK this might be an issue with `_mm256_conjugate_ps` in > `include/volk/volk_avx_intrinsics.h`. I didn't check for other potential > error sources. > > Cheers > Johannes > > Am 01.09.19 um 16:10 schrieb Albin Stigö: > > Anyone has experience with the real world impact of using gcc > > -ffast-math with SDR in general, and GNURadio/Volk in particular? > > > > > > --Albin SM6WJM > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > Discuss-gnuradio@gnu.org > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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