ieee on Windows problem

[FX]

Dear Brad,

(I’m CC’ing your email to the list, so others can chime in.)


> Great to see that you are back working on improving gfortran.  I built a new version of the mingw release of gfortran using the source after you added your new IEEE patches.  I have not used IEEE math routines previously, so to test it out, I copied some code from the IBM compiler manual.  I compiled the code with
> 
> gfortran sample1.f90  -fno-unsafe-math-optimizations -frounding-math -fsignaling-nans
> 
> Unfortunately, executing the program produced a strange error message.
> 
> Assertion failed: sizeof(my_fenv_t) <= (size_t) GFC_FPE_STATE_BUFFER_SIZE, file ./fpu-target.h, line 434

It looks like on mingw the my_fenv_t struct in libgfortran/config/fpu-387.h has larger size than it should. It probably is the alignment of bitfields __opcode and __unused4. Since we don’t actually access those, the following patch should restore the proper structure size/alignment. Could you check for me? I’ll also check it on x86_64-apple-darwin, and if both go okay, I’ll commit it ASAP.

In addition to your sample, you can find new testsuite files in gcc/testsuite/gfortran.dg/ieee directory. See inside as one of them requires special options (like -ffree-line-length-none -O0).

Cheers, and many many thanks for that quick testing!
FX


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