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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/84779] [10/11/12/13 Regression] Compiling
 gfortran.fortran-torture/execute/entry_4.f90 with -O1 or -Os and
 -fdefault-integer-8 gives an ICE
Date: Thu, 30 Mar 2023 19:10:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D84779

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|anlauf at gmx dot de               |anlauf at gcc dot g=
nu.org

--- Comment #13 from anlauf at gcc dot gnu.org ---
I've come back to this PR again and spent a while trying to further narrow
things down and to find the gcc options that make the code compile or fail.

Minimal reproducer:

        complex function f2 (a)
        implicit none
        integer   a
        logical   e2
        entry e2 (a)
        if (a > 0) then
          e2 =3D .true.
        else
          f2 =3D 45
        endif
        end

Basic command line: "gfortran -fdefault-integer-8", plus:

these all lead to an ICE:
! -O1
! -O1 -fno-tree-pre
! -O2 -fno-tree-pre

but no ICE with:
! -O2
! -O1 -ftree-pre
! -O2 -ftree-pre
! -O1 -fno-tree-sra
! -O2 -fno-tree-sra
! -O1 -fno-tree-sra -fno-tree-pre
! -O2 -fno-tree-sra -fno-tree-pre

So is this now a frontend bug - what could it be? - or a middle-end issue?=