gcc/testsuite/gfortran.dg/pr44592.f90

   1 ! { dg-do run }
   2 ! { dg-options "-O3" }
   3 ! From forall_12.f90
   4 ! Fails with loop reversal at -O3
   5 !
   6   character(len=1) :: b(4) = (/"1","2","3","4"/), c(4)
   7   c = b
   8   i = 1
   9   ! This statement must be here for the abort below
  10   b(1:3)(i:i) = b(2:4)(i:i)
  11
  12   b = c
  13   b(4:2:-1)(i:i) = b(3:1:-1)(i:i)
  14
  15   ! This fails.  If the condition is printed, the result is F F F F
  16   if (any (b .ne. (/"1","1","2","3"/))) i = 2
  17   print *, b
  18   print *, b .ne. (/"1","1","2","3"/)
  19   if (i == 2) call abort
  20 end