On Mon, May 22, 2017 at 05:22:48PM +0200, Mattia Verga wrote:
> https://github.com/OpenPHDGuiding/phd2/issues/608
>
> I'm getting ctest failure only on F26 (and rawhide) i386, while on F25 all
> it's working fine.
> Can a precision problem be introduced in Eigen3 with the passage from GCC6
> to GCC7?
> Is it possible to set up a F26 mock chroot using GCC6 instead of GCC7?
If it affects just i?86, then it might very well be just some code unable to
deal with excess precision that i?86 has or with the default excess
precision of fast.
You can try -mfpmath=sse -msse2 (don't remember if Fedora still supports
pre-SSE2 HW, if yes, then this isn't an option), or -ffloat-store (if you are
willing to take the performance penalty, ideally on i?86 only), or make some
floating point variable volatile, or, if C and not C++/Fortran,
-fexcess-precision=standard.
Jakub
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