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Annotation of researchv10no/cmd/view2d/num/sscal.f, revision 1.1

1.1     ! root        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
        !             7:       real sa,sx(1)
        !             8:       integer i,incx,m,mp1,n,nincx
        !             9: c
        !            10:       if(n.le.0)return
        !            11:       if(incx.eq.1)go to 20
        !            12: c
        !            13: c        code for increment not equal to 1
        !            14: c
        !            15:       nincx = n*incx
        !            16:       do 10 i = 1,nincx,incx
        !            17:         sx(i) = sa*sx(i)
        !            18:    10 continue
        !            19:       return
        !            20: c
        !            21: c        code for increment equal to 1
        !            22: c
        !            23: c
        !            24: c        clean-up loop
        !            25: c
        !            26:    20 m = mod(n,5)
        !            27:       if( m .eq. 0 ) go to 40
        !            28:       do 30 i = 1,m
        !            29:         sx(i) = sa*sx(i)
        !            30:    30 continue
        !            31:       if( n .lt. 5 ) return
        !            32:    40 mp1 = m + 1
        !            33:       do 50 i = mp1,n,5
        !            34:         sx(i) = sa*sx(i)
        !            35:         sx(i + 1) = sa*sx(i + 1)
        !            36:         sx(i + 2) = sa*sx(i + 2)
        !            37:         sx(i + 3) = sa*sx(i + 3)
        !            38:         sx(i + 4) = sa*sx(i + 4)
        !            39:    50 continue
        !            40:       return
        !            41:       end

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