On Nov 21 2013, Joseph S. Myers wrote:
On Thu, 21 Nov 2013, FX wrote:
Indeed, 387/SSE has flush-to-zero modes. But other APIs do not (glibc,
SysV, AIX).
Note that glibc libm functions may not work when called in a flush-to-zero
mode, only in modes that can be established by the <fenv.h> functions.
Well, that's two clear bugs :-(
If, as you say, they may not work at all in combination with -ffast-math,
that's one.
Setting __STDC_IEC_559__ to 1 in combination with -ffast-math is another,
given that C99 and C11 reference ISO/IEC 10559 (1989).
Regards,
Nick Maclaren.
