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! { dg-do run }

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

! Test that expressions in subroutine calls are also optimized

program main

  implicit none

  character(len=4) :: c

  c = 'abcd'

  call yes(c == c)

  call no(c /= c)

end program main

subroutine yes(a)

  implicit none

  logical, intent(in) :: a

  if (.not. a) call abort

end subroutine yes

subroutine no(a)

  implicit none

  logical, intent(in) :: a

  if (a) call abort

end subroutine no

! { dg-final { scan-tree-dump-times "gfortran_compare_string" 0 "original" } }

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