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! { dg-do run }

! { dg-options "-O2 -fdump-tree-original" }

module foo

contains

  subroutine bar(a)

    real, dimension(:,:) :: a

    a(1,:) = 0.

  end subroutine bar

end module foo

program test

  use foo

  implicit none

  real, dimension (2,2) :: a, d, e

  real, dimension (1,2) :: b

  real, dimension (2) :: c

  data a, d, e /12*1.0/

  data b /2*1.0/

  data c /2*1.0/

  a(1,:) = 0.    ! This can't be optimized to a memset.

  b(1,:) = 0.    ! This is optimized to = {}.

  c = 0.         ! This is optimized to = {}.

  d(:,1) = 0.    ! This can't be otimized to a memset.

  call bar(e)

  if (any(a /= reshape((/ 0.0, 1.0, 0.0, 1.0/), shape(a)))) call abort

  if (any(b /= 0.)) call abort

  if (any(c /= 0.)) call abort

  if (any(d /= reshape((/ 0.0, 0.0, 1.0, 1.0/), shape(d)))) call abort

  if (any(e /= reshape((/ 0.0, 1.0, 0.0, 1.0/), shape(e)))) call abort

end program

! { dg-final { scan-tree-dump-times "= {}" 2 "original" } }

! { dg-final { cleanup-tree-dump "original" } }

! { dg-final { cleanup-modules "foo" } }