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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/111783] New: 'exit' intrinsic should be marked as
Date: Thu, 12 Oct 2023 11:59:06 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: burnus at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D111783

            Bug ID: 111783
           Summary: 'exit' intrinsic should be marked as
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: burnus at gcc dot gnu.org
  Target Milestone: ---

Compiling testsuite/gfortran.dg/team_number_1.f90 with -O3 produces the
following optimized dump:

  _gfortran_exit_i4 (0);
  _gfortran_exit_i4 (0);
  _gfortran_stop_numeric (2, 0);
}

The last three statements could be removed as the 'EXIT' intrinsic subrouti=
ne
is known not to return.

Thus, we should set
  ATTR_NORETURN_NOTHROW_LIST
(cf. fortran/f95-lang.cc).

There are probably more, at least the ABORT intrinsic subroutine and
the functions associated with STOP / ERROR STOP like _gfortran_stop_numeric=
.=