      SUBROUTINE DCOPY(N,DX,INCX,DY,INCY)
*     .. Scalar Arguments ..
      INTEGER INCX,INCY,N
*     ..
*     .. Array Arguments ..
      DOUBLE PRECISION DX(*),DY(*)
*     ..
*
*  Purpose
*  =======
*
*     DCOPY copies a vector, x, to a vector, y.
*     uses unrolled loops for increments equal to one. 
*
*  Further Details
*  ===============
*
*     jack dongarra, linpack, 3/11/78. 
*     modified 12/3/93, array(1) declarations changed to array(*)
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER I,IX,IY,M,MP1
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC MOD
*     ..
      IF (N.LE.0) RETURN
      IF (INCX.EQ.1 .AND.  INCY.EQ.1) THEN
*
*        code for both increments equal to 1
*
*
*        clean-up loop
*
         M = MOD(N,7)
         IF (M.NE.0) THEN
            DO I = 1,M
               DY(I) = DX(I)
            END DO
            IF (N.LT.7) RETURN
         END IF   
         MP1 = M + 1
         DO I = MP1,N,7
            DY(I) = DX(I)
            DY(I+1) = DX(I+1)
            DY(I+2) = DX(I+2)
            DY(I+3) = DX(I+3)
            DY(I+4) = DX(I+4)
            DY(I+5) = DX(I+5)
            DY(I+6) = DX(I+6)
         END DO
      ELSE      
*
*        code for unequal increments or equal increments
*          not equal to 1
*
         IX = 1
         IY = 1
         IF (INCX.LT.0) IX = (-N+1)*INCX + 1
         IF (INCY.LT.0) IY = (-N+1)*INCY + 1
         DO I = 1,N
            DY(IY) = DX(IX)
            IX = IX + INCX
            IY = IY + INCY
         END DO
      END IF
      RETURN
      END
