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From: "andrew.burgess at embecosm dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/99027] New: Incorrect ubound result
Date: Tue, 09 Feb 2021 15:30:30 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99027

            Bug ID: 99027
           Summary: Incorrect ubound result
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: andrew.burgess at embecosm dot com
  Target Milestone: ---

I believe I have run into a case where ubound is giving the wrong result.

Given:

  program test
    integer, dimension (1:3,1:6) :: array
    print *, "ubound =3D ", ubound (array (1, 1:4))
  end program test

I see the output:

  ubound =3D            1

When I would have expected:

  ubound =3D            4

Due to array (1, 1:4) being a 4 element 1-dimensional array.

I am seeing this behaviour in my default Fedora compiler:

  GNU Fortran (GCC) 9.3.1 20200408 (Red Hat 9.3.1-2)

But I also build current HEAD from git (26a3f288f18) and am still seeing th=
is
issue:

  GNU Fortran (GCC) 11.0.0 20210209 (experimental)

Interestingly, if I change the test program to:

  program test
    integer, dimension (1:3,1:6) :: array
    print *, "ubound =3D ", ubound (array (1:2, 1:4))
  end program test

Then I do now see what I would expect for this case:

  ubound =3D            2           4=