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From: Richard Biener <richard.guenther@gmail.com>
Date: Fri, 15 Jun 2018 09:08:00 -0000
Message-ID: <CAFiYyc2HYq3bG1rusi5et0AENYbtK4k+_ODY9ZG_3o3n2zSNNA@mail.gmail.com>
Subject: Re: libmvec in gcc to have vector math in fortran
To: szabolcs.nagy@arm.com
Cc: Florian Weimer <fw@deneb.enyo.de>, nd@arm.com, Jakub Jelinek <jakub@redhat.com>, 	Janne Blomqvist <blomqvist.janne@gmail.com>, GCC Development <gcc@gcc.gnu.org>, 	"fortran@gcc.gnu.org" <fortran@gcc.gnu.org>, sellcey@cavium.com
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On Fri, Jun 15, 2018 at 10:39 AM Szabolcs Nagy <szabolcs.nagy@arm.com> wrote:
>
> On 15/06/18 08:59, Florian Weimer wrote:
> > * Richard Biener:
> >
> >> 'pure' makes it pure but there doesn't seem to be a way to make it const?
> >
> > Does Fortran support setting the rounding mode?
> >
>
> yes, but vec math is only enabled with -ffast-math (so it can
> assume -fno-rounding-math)
>
> > In C, sin is not const because it depends on the current rounding
> > mode.
> >
>
> hm i don't see const in glibc even in case of -ffast-math compilation,
> i wonder if that can be changed.

For sin() it also depends on -fno-math-errno (default for fortran) given
sin() may set errno according to the manpage (that means it isn't
even pure by default).

Richard.