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From: "nickpapior at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99355] -freal-X-real-Y -freal-Z-real-X promotes Z to Y
Date: Wed, 03 Mar 2021 09:16:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99355

--- Comment #3 from Nick <nickpapior at gmail dot com> ---
Yes, real*4 -> real*16.=20

I agree that the option semantics are not clear. However, the documentation
says:

Promote all REAL(KIND=3DM) entities to REAL(KIND=3DN) entities. If REAL(KIN=
D=3DN) is
unavailable, then an error will be issued. All other real kind types are
unaffected by this option. These options should be used with care and may n=
ot
be suitable for your codes. Areas of possible concern include calls to exte=
rnal
procedures, alignment in EQUIVALENCE and/or COMMON, generic interfaces, BOZ
literal constant conversion, and I/O. Inspection of the intermediate
representation of the translated Fortran code, produced by
-fdump-tree-original, is suggested.

>>From this I read that no *double* promotions are done. However, the text is=
n't
clear either.

I would just not assume that *everything* gets promoted, especially since t=
here
is a -freal-4-real-16 option, so users can already be explicit.


I guess this also applies to the -finteger-4-integer-8 and friends (unteste=
d)=