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