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+MODULE reduction_test
+
+CONTAINS
+
+SUBROUTINE reduction_kernel(x_min,x_max,y_min,y_max,arr,sum)
+
+ IMPLICIT NONE
+
+ INTEGER :: x_min,x_max,y_min,y_max
+ REAL(KIND=8), DIMENSION(x_min-2:x_max+2,y_min-2:y_max+2) :: arr
+ REAL(KIND=8) :: sum
+
+ INTEGER :: j,k
+
+!$ACC DATA PRESENT(arr) COPY(sum)
+!$ACC PARALLEL LOOP REDUCTION(+ : sum)
+ DO k=y_min,y_max
+ DO j=x_min,x_max
+ sum=sum+arr(j,k)
+ ENDDO
+ ENDDO
+!$ACC END PARALLEL LOOP
+!$ACC END DATA
+END SUBROUTINE reduction_kernel
+
+END MODULE reduction_test
+
+program main
+ use reduction_test
+
+ integer :: x_min,x_max,y_min,y_max
+ real(kind=8), dimension(1:10,1:10) :: arr
+ real(kind=8) :: sum
+
+ x_min = 1
+ x_max = 2
+ y_min = 1
+ y_max = 2
+
+ arr(:,:) = 1.0
+
+ sum = 0.0
+
+ !$acc data copy(arr)
+
+ call reduction_kernel(x_min,x_max,y_min,y_max,arr,sum)
+
+ !$acc end data
+
+ if (sum .ne. 4.0) call abort
+end program