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Annotation of researchv10no/cmd/view2d/num/scopy.f, revision 1.1.1.1

1.1       root        1:       subroutine scopy(n,sx,incx,sy,incy)
                      2: c
                      3: c     copies a vector, x, to a vector, y.
                      4: c     uses unrolled loops for increments equal to 1.
                      5: c     jack dongarra, linpack, 3/11/78.
                      6: c
                      7:       real sx(1),sy(1)
                      8:       integer i,incx,incy,ix,iy,m,mp1,n
                      9: c
                     10:       if(n.le.0)return
                     11:       if(incx.eq.1.and.incy.eq.1)go to 20
                     12: c
                     13: c        code for unequal increments or equal increments
                     14: c          not equal to 1
                     15: c
                     16:       ix = 1
                     17:       iy = 1
                     18:       if(incx.lt.0)ix = (-n+1)*incx + 1
                     19:       if(incy.lt.0)iy = (-n+1)*incy + 1
                     20:       do 10 i = 1,n
                     21:         sy(iy) = sx(ix)
                     22:         ix = ix + incx
                     23:         iy = iy + incy
                     24:    10 continue
                     25:       return
                     26: c
                     27: c        code for both increments equal to 1
                     28: c
                     29: c
                     30: c        clean-up loop
                     31: c
                     32:    20 m = mod(n,7)
                     33:       if( m .eq. 0 ) go to 40
                     34:       do 30 i = 1,m
                     35:         sy(i) = sx(i)
                     36:    30 continue
                     37:       if( n .lt. 7 ) return
                     38:    40 mp1 = m + 1
                     39:       do 50 i = mp1,n,7
                     40:         sy(i) = sx(i)
                     41:         sy(i + 1) = sx(i + 1)
                     42:         sy(i + 2) = sx(i + 2)
                     43:         sy(i + 3) = sx(i + 3)
                     44:         sy(i + 4) = sx(i + 4)
                     45:         sy(i + 5) = sx(i + 5)
                     46:         sy(i + 6) = sx(i + 6)
                     47:    50 continue
                     48:       return
                     49:       end

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