dscal.f

*> \brief \b DSCAL
*
*  =========== DOCUMENTATION ===========
*
* Online html documentation available at
*            http://www.netlib.org/lapack/explore-html/
*
*  Definition:
*  ===========
*
*       SUBROUTINE DSCAL(N,DA,DX,INCX)
*
*       .. Scalar Arguments ..
*       DOUBLE PRECISION DA
*       INTEGER INCX,N
*       ..
*       .. Array Arguments ..
*       DOUBLE PRECISION DX(*)
*       ..
*
*
*> \par Purpose:
*  =============
*>
*> \verbatim
*>
*>    DSCAL scales a vector by a constant.
*>    uses unrolled loops for increment equal to 1.
*> \endverbatim
*
*  Arguments:
*  ==========
*
*> \param[in] N
*> \verbatim
*>          N is INTEGER
*>         number of elements in input vector(s)
*> \endverbatim
*>
*> \param[in] DA
*> \verbatim
*>          DA is DOUBLE PRECISION
*>           On entry, DA specifies the scalar alpha.
*> \endverbatim
*>
*> \param[in,out] DX
*> \verbatim
*>          DX is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCX ) )
*> \endverbatim
*>
*> \param[in] INCX
*> \verbatim
*>          INCX is INTEGER
*>         storage spacing between elements of DX
*> \endverbatim
*
*  Authors:
*  ========
*
*> \author Univ. of Tennessee
*> \author Univ. of California Berkeley
*> \author Univ. of Colorado Denver
*> \author NAG Ltd.
*
*> \date November 2017
*
*> \ingroup double_blas_level1
*
*> \par Further Details:
*  =====================
*>
*> \verbatim
*>
*>     jack dongarra, linpack, 3/11/78.
*>     modified 3/93 to return if incx .le. 0.
*>     modified 12/3/93, array(1) declarations changed to array(*)
*> \endverbatim
*>
*  =====================================================================
      SUBROUTINE DSCAL(N,DA,DX,INCX)
*
*  -- Reference BLAS level1 routine (version 3.8.0) --
*  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
*  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
*     November 2017
*
*     .. Scalar Arguments ..
      DOUBLE PRECISION DA
      INTEGER INCX,N
*     ..
*     .. Array Arguments ..
      DOUBLE PRECISION DX(*)
*     ..
*
*  =====================================================================
*
*     .. Local Scalars ..
      INTEGER I,M,MP1,NINCX
*     ..
*     .. Intrinsic Functions ..
      INTRINSIC MOD
*     ..
      IF (N.LE.0 .OR. INCX.LE.0) RETURN
      IF (INCX.EQ.1) THEN
*
*        code for increment equal to 1
*
*
*        clean-up loop
*
         M = MOD(N,5)
         IF (M.NE.0) THEN
            DO I = 1,M
               DX(I) = DA*DX(I)
            END DO
            IF (N.LT.5) RETURN
         END IF
         MP1 = M + 1
         DO I = MP1,N,5
            DX(I) = DA*DX(I)
            DX(I+1) = DA*DX(I+1)
            DX(I+2) = DA*DX(I+2)
            DX(I+3) = DA*DX(I+3)
            DX(I+4) = DA*DX(I+4)
         END DO
      ELSE
*
*        code for increment not equal to 1
*
         NINCX = N*INCX
         DO I = 1,NINCX,INCX
            DX(I) = DA*DX(I)
         END DO
      END IF
      RETURN
      END