--- rpl/lapack/blas/dscal.f	2012/12/14 14:22:02	1.10
+++ rpl/lapack/blas/dscal.f	2023/08/07 08:38:43	1.16
@@ -2,14 +2,14 @@
 *
 *  =========== DOCUMENTATION ===========
 *
-* Online html documentation available at 
-*            http://www.netlib.org/lapack/explore-html/ 
+* 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
@@ -17,7 +17,7 @@
 *       .. Array Arguments ..
 *       DOUBLE PRECISION DX(*)
 *       ..
-*  
+*
 *
 *> \par Purpose:
 *  =============
@@ -25,18 +25,42 @@
 *> \verbatim
 *>
 *>    DSCAL scales a vector by a constant.
-*>    uses unrolled loops for increment equal to one.
+*>    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 2011
+*> \author Univ. of Tennessee
+*> \author Univ. of California Berkeley
+*> \author Univ. of Colorado Denver
+*> \author NAG Ltd.
 *
 *> \ingroup double_blas_level1
 *
@@ -53,10 +77,9 @@
 *  =====================================================================
       SUBROUTINE DSCAL(N,DA,DX,INCX)
 *
-*  -- Reference BLAS level1 routine (version 3.4.0) --
+*  -- Reference BLAS level1 routine --
 *  -- Reference BLAS is a software package provided by Univ. of Tennessee,    --
 *  -- Univ. of California Berkeley, Univ. of Colorado Denver and NAG Ltd..--
-*     November 2011
 *
 *     .. Scalar Arguments ..
       DOUBLE PRECISION DA
@@ -70,11 +93,14 @@
 *
 *     .. Local Scalars ..
       INTEGER I,M,MP1,NINCX
+*     .. Parameters ..
+      DOUBLE PRECISION ONE
+      PARAMETER (ONE=1.0D+0)
 *     ..
 *     .. Intrinsic Functions ..
       INTRINSIC MOD
 *     ..
-      IF (N.LE.0 .OR. INCX.LE.0) RETURN
+      IF (N.LE.0 .OR. INCX.LE.0 .OR. DA.EQ.ONE) RETURN
       IF (INCX.EQ.1) THEN
 *
 *        code for increment equal to 1
@@ -107,4 +133,7 @@
          END DO
       END IF
       RETURN
+*
+*     End of DSCAL
+*
       END