Mercurial > octave-nkf

view libcruft/blas/saxpy.f @ 7789:82be108cc558

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
First attempt at single precision tyeps * * * corrections to qrupdate single precision routines * * * prefer demotion to single over promotion to double * * * Add single precision support to log2 function * * * Trivial PROJECT file update * * * Cache optimized hermitian/transpose methods * * * Add tests for tranpose/hermitian and ChangeLog entry for new transpose code
author David Bateman <dbateman@free.fr>
date Sun, 27 Apr 2008 22:34:17 +0200
parents
children
line wrap: on
line source

      SUBROUTINE SAXPY(N,SA,SX,INCX,SY,INCY)
*     .. Scalar Arguments ..
      REAL SA
      INTEGER INCX,INCY,N
*     ..
*     .. Array Arguments ..
      REAL SX(*),SY(*)
*     ..
*
*  Purpose
*  =======
*
*     SAXPY constant times a vector plus a vector.
*     uses unrolled loop for increments equal to one.
*     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 (SA.EQ.0.0) RETURN
      IF (INCX.EQ.1 .AND. INCY.EQ.1) GO TO 20
*
*        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
          SY(IY) = SY(IY) + SA*SX(IX)
          IX = IX + INCX
          IY = IY + INCY
   10 CONTINUE
      RETURN
*
*        code for both increments equal to 1
*
*
*        clean-up loop
*
   20 M = MOD(N,4)
      IF (M.EQ.0) GO TO 40
      DO 30 I = 1,M
          SY(I) = SY(I) + SA*SX(I)
   30 CONTINUE
      IF (N.LT.4) RETURN
   40 MP1 = M + 1
      DO 50 I = MP1,N,4
          SY(I) = SY(I) + SA*SX(I)
          SY(I+1) = SY(I+1) + SA*SX(I+1)
          SY(I+2) = SY(I+2) + SA*SX(I+2)
          SY(I+3) = SY(I+3) + SA*SX(I+3)
   50 CONTINUE
      RETURN
      END