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! { dg-do run }

! Program to check corner cases for DO statements.

program do_1

  implicit none

  integer i, j

  ! limit=HUGE(i), step 1

  j = 0

  do i = HUGE(i) - 10, HUGE(i), 1

    j = j + 1

  end do

  if (j .ne. 11) call abort

  ! limit=HUGE(i), step > 1

  j = 0

  do i = HUGE(i) - 10, HUGE(i), 2

    j = j + 1

  end do

  if (j .ne. 6) call abort

  j = 0

  do i = HUGE(i) - 9, HUGE(i), 2

    j = j + 1

  end do

  if (j .ne. 5) call abort

  ! Same again, but unknown loop step

  if (test1(10, 1) .ne. 11) call abort

  if (test1(10, 2) .ne. 6) call abort

  if (test1(9, 2) .ne. 5) call abort

  ! Zero iterations

  j = 0

  do i = 1, 0, 1 ! { dg-warning "executed zero times" }

    j = j + 1

  end do

  if (j .ne. 0) call abort

  j = 0

  do i = 1, 0, 2 ! { dg-warning "executed zero times" }

    j = j + 1

  end do

  if (j .ne. 0) call abort

  j = 0

  do i = 1, 2, -1 ! { dg-warning "executed zero times" }

    j = j + 1

  end do

  if (j .ne. 0) call abort

  call test2 (0, 1)

  call test2 (0, 2)

  call test2 (2, -1)

  call test2 (2, -2)

  ! Bound near smallest value

  j = 0;

  do i = -HUGE(i), -HUGE(i), 10

    j = j + 1

  end do

  if (j .ne. 1) call abort

contains

! Returns the number of iterations performed.

function test1(r, step)

  implicit none

  integer test1, r, step

  integer k, n

  k = 0

  do n = HUGE(n) - r, HUGE(n), step

    k = k + 1

  end do

  test1 = k

end function

subroutine test2 (lim, step)

  implicit none

  integer lim, step

  integer k, n

  k = 0

  do n = 1, lim, step

    k = k + 1

  end do

  if (k .ne. 0) call abort

end subroutine

end program