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List:       gcc-bugs
Subject:    [Bug fortran/107071] gfortran.dg/ieee/modes_1.f90 fails on aarch64-linux
From:       "fxcoudert at gcc dot gnu.org via Gcc-bugs" <gcc-bugs () gcc ! gnu ! org>
Date:       2022-09-30 17:42:21
Message-ID: bug-107071-4-2LVVDAdsPy () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107071

--- Comment #9 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org> ---
OK so there are three things tested here:

- underflow mode
- rounding mode
- trapping mode

For glibc targets, underflow control is only marked as supported for the float
and double types on __alpha__. For rounding mode, the code makes incorrect
assumptions and I have proposed a prototype patch to
support_fpu_rounding_mode().

For trapping modes, it means that support_fpu_trap() needs to perform correct
runtime checks. As I understand, this can be done by calling feenableexcept()
and checking whether it returns -1 (flag not supported) or something else (flag
supported). Then I need to restore the flag with fedisableexcept(), if the flag
was not already set prior to the feenableexcept() call.

I will write a patch when I have time. Thanks for pointing the issue out to me.=
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