pw_toy_code/pw_methods_acc.F at main · fstein93/pw_toy_code · GitHub

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MODULE pw_methods_acc

      PRIVATE

      PUBLIC :: pw_axpy_ref_acc

      CONTAINS

             SUBROUTINE pw_axpy_ref_acc(array1, array2, gidx, alpha)
                     COMPLEX(KIND=8), CONTIGUOUS, DIMENSION(:), INTENT(IN) :: array1
                     COMPLEX(KIND=8), CONTIGUOUS, DIMENSION(:), INTENT(INOUT) :: array2
                     INTEGER, DIMENSION(:), CONTIGUOUS, INTENT(IN) :: gidx
                     REAL(KIND=8), INTENT(IN) :: alpha

                     INTEGER :: ng, ng1, ng2, i, j

                     ng1 = SIZE(array1)
                     ng2 = SIZE(array2)
                     ng = MIN(ng1, ng2)

                     IF (ng1 >= ng2) THEN
                        IF (alpha == 1.0_8) THEN
!$acc kernels
                           DO i = 1, ng
                              j = gidx(i)
                              array2(i) = array2(i) + array1(j)
                           END DO
!$acc end kernels
                        ELSE IF (alpha /= 0.0_8) THEN
!$acc kernels
                           DO i = 1, ng
                              j = gidx(i)
                              array2(i) = array2(i) + alpha*array1(j)
                           END DO
!$acc end kernels
                        END IF
                     ELSE
                        IF (alpha == 1.0_8) THEN
!$acc kernels
                           DO i = 1, ng
                              j = gidx(i)
                              array2(j) = array2(j) + array1(i)
                           END DO
!$acc end kernels
                        ELSE IF (alpha /= 0.0_8) THEN
!$acc kernels
                           DO i = 1, ng
                              j = gidx(i)
                              array2(j) = array2(j) + alpha*array1(i)
                           END DO
!$acc end kernels
                        END IF
                     END IF
                     END SUBROUTINE pw_axpy_ref_acc
END MODULE pw_methods_acc