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From: "anlauf 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 16:23:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101123

--- Comment #2 from anlauf at gcc dot gnu.org ---
Why on Earth would somebody really want to combine legacy MAX0 with
IMPLICIT INTEGER*4 and -fdefault-integer-8?

Reduced testcase:

      SUBROUTINE TEST
      IMPLICIT INTEGER*4 (I-N)
      MAXMN=3DMAX0(M,N)
      END

Dump tree:

__attribute__((fn spec (". ")))
void test ()
{
  integer(kind=3D4) m;
  integer(kind=3D4) maxmn;
  integer(kind=3D4) n;

  {
    integer(kind=3D4) M.0;

    M.0 =3D m;
    M.0 =3D MAX_EXPR <n, M.0>;
    maxmn =3D (integer(kind=3D4)) (integer(kind=3D8)) M.0;
  }
}

Is the dump tree inaccurate?  It matches my expectation.

Note: the code compiles with MAX0 replaced by (the generic) MAX.=