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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/101123] [11/12 Regression] Invalid code for MAX0 with
 -fdefault-integer-8
Date: Fri, 18 Jun 2021 16:44:15 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101123

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This is clearly a FE bug:
gfc_conv_intrinsic_minmax does:
  if (TREE_CODE (type) =3D=3D INTEGER_TYPE)
    se->expr =3D fold_build1_loc (input_location, FIX_TRUNC_EXPR, type, mva=
r);
  else
    se->expr =3D convert (type, mvar);
and as type (in this kase integer(kind=3D8)) is INTEGER_TYPE, it creates a
FIX_TRUNC_EXPR.  But that is only valid if mvar has floating point type, wh=
ich
is not the case here.
Why don't you do se->expr =3D convert (type, mvar); unconditionally?  That =
should
create FIX_TRUNC_EXPR for the FLOAT_TYPE -> INTEGER_TYPE conversion as well,
but will handle correctly even INTEGER_TYPE -> INTEGER_TYPE conversions etc=
.?=