# Contents of /trunk/blas/dasum.f

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 1 C dasum.f 2 C is freely available from netlib. It is not subject to any GNU License 3 C set by the authors of the ASCEND math programming system. 4 C \$Date: 1996/04/30 18:14:07 \$ \$Revision: 1.1.1.1 \$ 5 C 6 double precision function dasum(n,dx,incx) 7 c 8 c takes the sum of the absolute values. 9 c jack dongarra, linpack, 3/11/78. 10 c 11 double precision dx(*),dtemp 12 integer i,incx,m,mp1,n,nincx 13 c 14 dasum = 0.0d0 15 dtemp = 0.0d0 16 if(n.le.0)return 17 if(incx.eq.1)go to 20 18 c 19 c code for increment not equal to 1 20 c 21 nincx = n*incx 22 do 10 i = 1,nincx,incx 23 dtemp = dtemp + dabs(dx(i)) 24 10 continue 25 dasum = dtemp 26 return 27 c 28 c code for increment equal to 1 29 c 30 c 31 c clean-up loop 32 c 33 20 m = mod(n,6) 34 if( m .eq. 0 ) go to 40 35 do 30 i = 1,m 36 dtemp = dtemp + dabs(dx(i)) 37 30 continue 38 if( n .lt. 6 ) go to 60 39 40 mp1 = m + 1 40 do 50 i = mp1,n,6 41 dtemp = dtemp + dabs(dx(i)) + dabs(dx(i + 1)) + dabs(dx(i + 2)) 42 * + dabs(dx(i + 3)) + dabs(dx(i + 4)) + dabs(dx(i + 5)) 43 50 continue 44 60 dasum = dtemp 45 return 46 end 47

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