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! { dg-do compile }

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

!

! During the discussion of the fix for PR43072, in which unnecessary

! calls to internal PACK/UNPACK were being generated, the following,

! further unnecessary temporaries or PACk/UNPACK were found.

!

! Contributed by Tobias Burnus 

!

! Case 1: Substring encompassing the whole string

subroutine foo2

  implicit none

  external foo

  character(len=20) :: str(2) = '1234567890'

  call foo(str(:)(1:20)) ! This is still not fixed.

end

! Case 2: Contiguous array section

subroutine bar

  implicit none

  external foo

  integer :: a(3,3,3)

  call foo(a(:,:,:)) ! OK, no temporary

  call foo(a(:,:,1)) ! OK, no temporary

  call foo(a(:,2,2)) ! Used unnecessarily a temporary -FIXED

  call foo(a(2,:,1)) ! OK, creates a temporary(1)

end

! Case 3: Stride 1 section.

subroutine foobar

  implicit none

  external foo

  integer :: A(10,10)

  call foo(A(3:7,4)) ! Used unnecessarily a temporary - FIXED

  call foo(A(:,3:7)) ! OK (no temporary)

  call foo(A(1:10,3:7)) ! OK (no temporary)

  call foo(A(4,3:7)) ! temporary OK(2)

  call foo(A(:,3:7:-1)) ! temporary(3) OK because of stride

end

! { dg-final { scan-tree-dump-times "unpack" 3 "original" } }

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