[fortran,patch] Support for IEEE underflow control on x86/x86_64

[FX]

> I'd suggest to name this fie ieee_underflow_1.f90 for consistency.

In fact, since the directory is called ieee/, I think I’ll rename the others so they don’t all start with ieee_


> BTW: underflow control also works on alpha, using following code:

Could you test the attached libgfortran/config/fpu-glibc.h file on alpha?


> You can mark variables with “volatile”

Indeed, I should have thought of that. Once you report the results of the alpha modification, I’ll propose an updated patch with all of those remarks.

Thanks,
FX



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