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From: "mikael at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/112371] New: Wrong upper bound for the result of
 reduction intrinsics if the array is empty
Date: Fri, 03 Nov 2023 15:23:33 +0000
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X-Bugzilla-Version: 14.0
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D112371

            Bug ID: 112371
           Summary: Wrong upper bound for the result of reduction
                    intrinsics if the array is empty
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mikael at gcc dot gnu.org
  Target Milestone: ---

In the following example, I expect the ubound to be (/ 3, 0, 7 /), but the
printed values are (/ 0, 0, 7 /).


program p
  implicit none
  call check_iparity
  call check_sum
  call check_minloc
contains
  subroutine check_iparity
    integer :: a(9,3,0,7)
    integer :: i
    integer, allocatable :: r(:,:,:)
    i =3D 1
    a =3D reshape((/ integer:: /), shape(a))
    r =3D iparity(a, dim=3Di)
    print *, shape(r)
    print *, ubound(r)
!    if (any(shape(r) /=3D (/ 3, 0, 7 /))) stop 11
!    if (any(ubound(r) /=3D (/ 3, 0, 7 /))) stop 13
  end subroutine
  subroutine check_sum
    integer :: a(9,3,0,7)
    integer :: i
    integer, allocatable :: r(:,:,:)
    i =3D 1
    a =3D reshape((/ integer:: /), shape(a))
    r =3D sum(a, dim=3Di)
    print *, shape(r)
    print *, ubound(r)
!    if (any(shape(r) /=3D (/ 3, 0, 7 /))) stop 21
!    if (any(ubound(r) /=3D (/ 3, 0, 7 /))) stop 23
  end subroutine
  subroutine check_minloc
    integer :: a(9,3,0,7)
    integer :: i
    integer, allocatable :: r(:,:,:)
    i =3D 1
    a =3D reshape((/ integer:: /), shape(a))
    r =3D minloc(a, dim=3Di)
    print *, shape(r)
    print *, ubound(r)
!    if (any(shape(r) /=3D (/ 3, 0, 7 /))) stop 31
!    if (any(ubound(r) /=3D (/ 3, 0, 7 /))) stop 33
  end subroutine
end program=