gcc/testsuite/gfortran.dg/array_memset_2.f90

   1 ! { dg-do run }
   2 ! { dg-options "-O2 -fdump-tree-original" }
   3
   4 module foo
   5 contains
   6   subroutine bar(a)
   7     real, dimension(:,:) :: a
   8     a(1,:) = 0.
   9   end subroutine bar
  10 end module foo
  11
  12 program test
  13   use foo
  14   implicit none
  15   real, dimension (2,2) :: a, d, e
  16   real, dimension (1,2) :: b
  17   real, dimension (2) :: c
  18   data a, d, e /12*1.0/
  19   data b /2*1.0/
  20   data c /2*1.0/
  21
  22   a(1,:) = 0.    ! This can't be optimized to a memset.
  23   b(1,:) = 0.    ! This is optimized to = {}.
  24   c = 0.         ! This is optimized to = {}.
  25   d(:,1) = 0.    ! This can't be otimized to a memset.
  26   call bar(e)
  27
  28   if (any(a /= reshape((/ 0.0, 1.0, 0.0, 1.0/), shape(a)))) STOP 1
  29   if (any(b /= 0.)) STOP 2
  30   if (any(c /= 0.)) STOP 3
  31   if (any(d /= reshape((/ 0.0, 0.0, 1.0, 1.0/), shape(d)))) STOP 4
  32   if (any(e /= reshape((/ 0.0, 1.0, 0.0, 1.0/), shape(e)))) STOP 5
  33
  34 end program
  35
  36 ! { dg-final { scan-tree-dump-times "= {}" 2 "original" } }