rpl/lapack/blas/ddot.f - diff

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Diff for /rpl/lapack/blas/ddot.f between versions 1.5 and 1.16

-version 1.5, 2010/08/13 21:03:39
+version 1.16, 2023/08/07 08:38:42
  Line 1
+ *> \brief \b DDOT
+ *
+ *  =========== DOCUMENTATION ===========
+ *
+ * Online html documentation available at
+ *            http://www.netlib.org/lapack/explore-html/
+ *
+ *  Definition:
+ *  ===========
+ *
+ *       DOUBLE PRECISION FUNCTION DDOT(N,DX,INCX,DY,INCY)
+ *
+ *       .. Scalar Arguments ..
+ *       INTEGER INCX,INCY,N
+ *       ..
+ *       .. Array Arguments ..
+ *       DOUBLE PRECISION DX(*),DY(*)
+ *       ..
+ *
+ *
+ *> \par Purpose:
+ *  =============
+ *>
+ *> \verbatim
+ *>
+ *>    DDOT forms the dot product of two vectors.
+ *>    uses unrolled loops for increments equal to one.
+ *> \endverbatim
+ *
+ *  Arguments:
+ *  ==========
+ *
+ *> \param[in] N
+ *> \verbatim
+ *>          N is INTEGER
+ *>         number of elements in input vector(s)
+ *> \endverbatim
+ *>
+ *> \param[in] 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
+ *>
+ *> \param[in] DY
+ *> \verbatim
+ *>          DY is DOUBLE PRECISION array, dimension ( 1 + ( N - 1 )*abs( INCY ) )
+ *> \endverbatim
+ *>
+ *> \param[in] INCY
+ *> \verbatim
+ *>          INCY is INTEGER
+ *>         storage spacing between elements of DY
+ *> \endverbatim
+ *
+ *  Authors:
+ *  ========
+ *
+ *> \author Univ. of Tennessee
+ *> \author Univ. of California Berkeley
+ *> \author Univ. of Colorado Denver
+ *> \author NAG Ltd.
+ *
+ *> \ingroup double_blas_level1
+ *
+ *> \par Further Details:
+ *  =====================
+ *>
+ *> \verbatim
+ *>
+ *>     jack dongarra, linpack, 3/11/78.
+ *>     modified 12/3/93, array(1) declarations changed to array(*)
+ *> \endverbatim
+ *>
+ *  =====================================================================
        DOUBLE PRECISION FUNCTION DDOT(N,DX,INCX,DY,INCY)
+ *
+ *  -- 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..--
+ *
  *     .. Scalar Arguments ..
        INTEGER INCX,INCY,N
  *     ..
- Line 6
+ Line 91
        DOUBLE PRECISION DX(*),DY(*)
  *     ..
  *
- *  Purpose
- *  =======
- *
- *     DDOT forms the dot product of two vectors.
- *     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 ..
- Line 30
+ Line 103
        DDOT = 0.0d0
        DTEMP = 0.0d0
        IF (N.LE.0) RETURN
-       IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
+       IF (INCX.EQ.1 .AND. INCY.EQ.1) THEN
- *
- *        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 10 I = 1,N
-           DTEMP = DTEMP + DX(IX)*DY(IY)
-           IX = IX + INCX
-           IY = IY + INCY
-CONTINUE
-       DDOT = DTEMP
-       RETURN
  *
  *        code for both increments equal to 1
  *
  *
  *        clean-up loop
  *
-M = MOD(N,5)
+          M = MOD(N,5)
-       IF (M.EQ.0) GO TO 40
+          IF (M.NE.0) THEN
-       DO 30 I = 1,M
+             DO I = 1,M
-           DTEMP = DTEMP + DX(I)*DY(I)
+                DTEMP = DTEMP + DX(I)*DY(I)
-CONTINUE
+             END DO
-       IF (N.LT.5) GO TO 60
+             IF (N.LT.5) THEN
-MP1 = M + 1
+                DDOT=DTEMP
-       DO 50 I = MP1,N,5
+             RETURN
+             END IF
+          END IF
+          MP1 = M + 1
+          DO I = MP1,N,5
            DTEMP = DTEMP + DX(I)*DY(I) + DX(I+1)*DY(I+1) +
-      +            DX(I+2)*DY(I+2) + DX(I+3)*DY(I+3) + DX(I+4)*DY(I+4)
+      $            DX(I+2)*DY(I+2) + DX(I+3)*DY(I+3) + DX(I+4)*DY(I+4)
-CONTINUE
+          END DO
-DDOT = DTEMP
+       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
+             DTEMP = DTEMP + DX(IX)*DY(IY)
+             IX = IX + INCX
+             IY = IY + INCY
+          END DO
+       END IF
+       DDOT = DTEMP
        RETURN
+ *
+ *     End of DDOT
+ *
        END

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