> Please look at libgcc/config/i386/crtfastmath.c for how to set
> MXCSR_FTZ from mxcsr. You already have all necessary bits in place,
> the function is basically only:
>
> + if (has_sse())
> + {
> + unsigned int cw_sse;
> +
> + __asm__ __volatile__ ("%vstmxcsr\t%0" : "=m" (cw_sse));
> + cw_sse |= MXCSR_DAZ;
> + __asm__ __volatile__ ("%vldmxcsr\t%0" : : "m" (cw_sse));
> + }
Thanks for the suggestion!
> Please note, that FTZ applies only to SSE math. x87 and (IIRC) soft-FP
> don't handle this setting.
Yeah, that’s also why I prefer for now to have it declared as unsupported: the
Fortran standard doesn’t really allow for partial support such as this, so I’m
still trying to figure out what The Right Thing To Do is.
FX
