On Fri, Jun 15, 2018 at 10:39 AM Szabolcs Nagy <szabolcs.n...@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.
