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From: "fxcoudert at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/95644] [F2018] IEEE_FMA is missing from the
 IEEE_ARITHMETIC module
Date: Thu, 30 Dec 2021 17:15:45 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95644

--- Comment #15 from Francois-Xavier Coudert <fxcoudert at gcc dot gnu.org>=
 ---
Created attachment 52094
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D52094&action=3Dedit
Tentative patch, adding IEEE_FMA and IEEE_SIGNBIT

I am attaching a tentative patch for the issue. I also added IEEE_SIGNBIT w=
hile
I was at it, since it was relatively simple. Other new IEEE functions in
Fortran 2018 will be more work.

The patch converts calls to IEEE_FMA and IEEE_SIGNBIT to the GCC builtins of
the same name. For IEEE_FMA, it also works with _Float128, and there it will
generate calls to the fmaq() function in libquadmath.

It generates the right code on simple examples, but I would welcome example=
s of
test programs that check the output of both IEEE_SIGNBIT and IEEE_FMA on
"interesting" cases.=