gcc/testsuite/gfortran.dg/loop_versioning_2.f90

   1 ! { dg-options "-O3 -fdump-tree-lversion-details -fno-frontend-loop-interchange" }
   2
   3 ! We could version the loop for when the first dimension has a stride
   4 ! of 1, but at present there's no real benefit.  The gimple loop
   5 ! interchange pass couldn't handle the versioned loop, and interchange
   6 ! is instead done by the frontend (but disabled by the options above).
   7
   8 subroutine f1(x)
   9   real :: x(:, :)
  10   do i = lbound(x, 1), ubound(x, 1)
  11      do j = lbound(x, 2), ubound(x, 2)
  12         x(i, j) = 100
  13      end do
  14   end do
  15 end subroutine f1
  16
  17 subroutine f2(x, n, step)
  18   integer :: n, step
  19   real :: x(100, 100)
  20   do i = 1, n
  21      do j = 1, n
  22         x(i * step, j) = 100
  23      end do
  24   end do
  25 end subroutine f2
  26
  27 subroutine f3(x, n, step)
  28   integer :: n, step
  29   real :: x(n * step, n)
  30   do i = 1, n
  31      do j = 1, n
  32         x(i * step, j) = 100
  33      end do
  34   end do
  35 end subroutine f3
  36
  37 ! { dg-final { scan-tree-dump-times {likely to be the innermost dimension} 1 "lversion" } }
  38 ! { dg-final { scan-tree-dump-not {want to version} "lversion" } }
  39 ! { dg-final { scan-tree-dump-not {versioned} "lversion" } }