osse/EnKF/sscal.F

      subroutine sscal(n,sa,sx,incx)
c
c     scales a vector by a constant.
c     uses unrolled loops for increment equal to 1.
c     jack dongarra, linpack, 3/11/78.
c     modified 3/93 to return if incx .le. 0.
c
      real sa,sx(1)
      integer i,incx,m,mp1,n,nincx
c
      if( n.le.0 .or. incx.le.0 )return
      if(incx.eq.1)go to 20
c
c        code for increment not equal to 1
c
      nincx = n*incx
      do 10 i = 1,nincx,incx
        sx(i) = sa*sx(i)
   10 continue
      return
c
c        code for increment equal to 1
c
c
c        clean-up loop
c
   20 m = mod(n,5)
      if( m .eq. 0 ) go to 40
      do 30 i = 1,m
        sx(i) = sa*sx(i)
   30 continue
      if( n .lt. 5 ) return
   40 mp1 = m + 1
      do 50 i = mp1,n,5
        sx(i) = sa*sx(i)
        sx(i + 1) = sa*sx(i + 1)
        sx(i + 2) = sa*sx(i + 2)
        sx(i + 3) = sa*sx(i + 3)
        sx(i + 4) = sa*sx(i + 4)
   50 continue
      return
      end
1	afe	1.1	subroutine sscal(n,sa,sx,incx)
2			c
3			c scales a vector by a constant.
4			c uses unrolled loops for increment equal to 1.
5			c jack dongarra, linpack, 3/11/78.
6			c modified 3/93 to return if incx .le. 0.
7			c
8			real sa,sx(1)
9			integer i,incx,m,mp1,n,nincx
10			c
11			if( n.le.0 .or. incx.le.0 )return
12			if(incx.eq.1)go to 20
13			c
14			c code for increment not equal to 1
15			c
16			nincx = n*incx
17			do 10 i = 1,nincx,incx
18			sx(i) = sa*sx(i)
19			10 continue
20			return
21			c
22			c code for increment equal to 1
23			c
24			c
25			c clean-up loop
26			c
27			20 m = mod(n,5)
28			if( m .eq. 0 ) go to 40
29			do 30 i = 1,m
30			sx(i) = sa*sx(i)
31			30 continue
32			if( n .lt. 5 ) return
33			40 mp1 = m + 1
34			do 50 i = mp1,n,5
35			sx(i) = sa*sx(i)
36			sx(i + 1) = sa*sx(i + 1)
37			sx(i + 2) = sa*sx(i + 2)
38			sx(i + 3) = sa*sx(i + 3)
39			sx(i + 4) = sa*sx(i + 4)
40			50 continue
41			return
42			end