https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91970
--- Comment #3 from nsz at gcc dot gnu.org ---
(In reply to Andreas Schwab from comment #2)
> Don't you need #pragma STDC FENV_ACCESS?
yes, for iso c conformance you need it, but gcc does not
handle it anyway, instead it requires -frounding-math.
however if double prec instructions are available, using them
may be even faster in the difficult inexact case, e.g.
double uconv64(uint64_t x)
{
double lo = uconv32(x); // single instruction, always exact
double hi = uconv32(x>>32);
return lo + hi*0x1p32;
}
so i would not make the fix depend on -frounding-math,
just always use hardfloat instructions on hardfloat targets
to do the conv.
(i suspect it affects more than just armhf)
