gcc/testsuite/gfortran.dg/pr25623-2.f90

   1 ! { dg-do compile }
   2 ! { dg-options "-fdump-tree-optimized-blocks-details -O3" }
   3
   4 SUBROUTINE S42(a,b,c,N)
   5  IMPLICIT NONE
   6  integer :: N
   7  real*8  :: a(N),b(N),c(N),tmp,tmp2,tmp4
   8  real*8, parameter :: p=1.0D0/3.0D0
   9  integer :: i
  10  c=0.0D0
  11  DO i=1,N
  12    tmp=a(i)**p ! could even be done with a cube root
  13    tmp2=tmp*tmp
  14    tmp4=tmp2*tmp2
  15    b(i)=b(i)+tmp4
  16    c(i)=c(i)+tmp2
  17  ENDDO
  18 END SUBROUTINE
  19 ! { dg-final { scan-tree-dump-not "Invalid sum" "optimized" } }