gcc/testsuite/gfortran.dg/directive_unroll_1.f90

   1 ! { dg-do compile }
   2 ! { dg-options "-O2 -fdump-tree-cunrolli-details -fdump-rtl-loop2_unroll-details" }
   3 ! Test that
   4 ! #pragma GCC unroll n
   5 ! works
   6
   7 subroutine test1(a)
   8   implicit NONE
   9   integer :: a(8)
  10   integer (kind=4) :: i
  11 !GCC$ unroll 8
  12   DO i=1, 8, 1
  13     call dummy(a(i))
  14   ENDDO
  15 ! { dg-final { scan-tree-dump "12:.*: loop with 8 iterations completely unrolled" "cunrolli" } } */
  16 end subroutine test1
  17
  18 subroutine test2(a, n)
  19   implicit NONE
  20   integer :: a(n)
  21   integer (kind=1), intent(in) :: n
  22   integer (kind=4) :: i
  23 !GCC$ unroll 8
  24   DO i=1, n, 1
  25     call dummy(a(i))
  26   ENDDO
  27 ! { dg-final { scan-rtl-dump "24:.: optimized: loop unrolled 7 times" "loop2_unroll" } }
  28 end subroutine test2
  29
  30 subroutine test3(a, n)
  31   implicit NONE
  32   integer (kind=1), intent(in) :: n
  33   integer :: a(n)
  34   integer (kind=4) :: i
  35 !GCC$ unroll 8
  36   DO i=n, 1, -1
  37     call dummy(a(i))
  38   ENDDO
  39 ! { dg-final { scan-rtl-dump "36:.: optimized: loop unrolled 7 times" "loop2_unroll" } }
  40 end subroutine test3
  41
  42 subroutine test4(a, n)
  43   implicit NONE
  44   integer (kind=1), intent(in) :: n
  45   integer :: a(n)
  46   integer (kind=4) :: i
  47 !GCC$ unroll 8
  48   DO i=1, n, 2
  49     call dummy(a(i))
  50   ENDDO
  51 ! { dg-final { scan-rtl-dump "48:.: optimized: loop unrolled 7 times" "loop2_unroll" } }
  52 end subroutine test4