gcc/testsuite/gfortran.dg/transpose_optimization_2.f90

   1 ! { dg-do run }
   2 ! { dg-options "-fdump-tree-original " }
   3 ! Checks the fix for PR46896, in which the optimization that passes
   4 ! the argument of TRANSPOSE directly missed the possible aliasing
   5 ! through host association.
   6 !
   7 ! Contributed by Jerry DeLisle  <jvdelisle@gcc.gnu.org>
   8 !
   9 module mod
  10   integer :: b(2,3) = reshape([1,2,3,4,5,6], [2,3])
  11 contains
  12   subroutine msub(x)
  13     integer :: x(:,:)
  14     b(1,:) = 99
  15     b(2,:) = x(:,1)
  16     if (any (b(:,1) /= [99, 1]).or.any (b(:,2) /= [99, 3])) STOP 1
  17   end subroutine msub
  18   subroutine pure_msub(x, y)
  19     integer, intent(in) :: x(:,:)
  20     integer, intent(OUT) :: y(size (x, 2), size (x, 1))
  21     y = transpose (x)
  22   end subroutine pure_msub
  23 end
  24
  25   use mod
  26   integer :: a(2,3) = reshape([1,2,3,4,5,6], [2,3])
  27   call impure
  28   call purity
  29 contains
  30 !
  31 ! pure_sub and pure_msub could be PURE, if so declared.  They do not
  32 ! need a temporary.
  33 !
  34   subroutine purity
  35     integer :: c(2,3)
  36     call pure_sub(transpose(a), c)
  37     if (any (c .ne. a)) STOP 1
  38     call pure_msub(transpose(b), c)
  39     if (any (c .ne. b)) STOP 2
  40   end subroutine purity
  41 !
  42 ! sub and msub both need temporaries to avoid aliasing.
  43 !
  44   subroutine impure
  45     call sub(transpose(a))
  46   end subroutine impure
  47
  48   subroutine sub(x)
  49     integer :: x(:,:)
  50     a(1,:) = 88
  51     a(2,:) = x(:,1)
  52     if (any (a(:,1) /= [88, 1]).or.any (a(:,2) /= [88, 3])) STOP 2
  53   end subroutine sub
  54   subroutine pure_sub(x, y)
  55     integer, intent(in) :: x(:,:)
  56     integer, intent(OUT) :: y(size (x, 2), size (x, 1))
  57     y = transpose (x)
  58   end subroutine pure_sub
  59 end
  60 !
  61 ! The check below for temporaries gave 14 and 33 for "parm" and "atmp".
  62 !
  63 ! { dg-final { scan-tree-dump-times "parm" 76 "original" } }
  64 ! { dg-final { scan-tree-dump-times "atmp" 13 "original" } }