[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

[anlauf at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84779

anlauf at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|anlauf at gmx dot de               |anlauf at gcc dot gnu.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 = .true.
        else
          f2 = 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?