01:       DOUBLE PRECISION FUNCTION DASUM(N,DX,INCX)
02: *     .. Scalar Arguments ..
03:       INTEGER INCX,N
04: *     ..
05: *     .. Array Arguments ..
06:       DOUBLE PRECISION DX(*)
07: *     ..
08: *
09: *  Purpose
10: *  =======
11: *
12: *     takes the sum of the absolute values.
13: *     jack dongarra, linpack, 3/11/78.
14: *     modified 3/93 to return if incx .le. 0.
15: *     modified 12/3/93, array(1) declarations changed to array(*)
16: *
17: *
18: *     .. Local Scalars ..
19:       DOUBLE PRECISION DTEMP
20:       INTEGER I,M,MP1,NINCX
21: *     ..
22: *     .. Intrinsic Functions ..
23:       INTRINSIC DABS,MOD
24: *     ..
25:       DASUM = 0.0d0
26:       DTEMP = 0.0d0
27:       IF (N.LE.0 .OR. INCX.LE.0) RETURN
28:       IF (INCX.EQ.1) GO TO 20
29: *
30: *        code for increment not equal to 1
31: *
32:       NINCX = N*INCX
33:       DO 10 I = 1,NINCX,INCX
34:           DTEMP = DTEMP + DABS(DX(I))
35:    10 CONTINUE
36:       DASUM = DTEMP
37:       RETURN
38: *
39: *        code for increment equal to 1
40: *
41: *
42: *        clean-up loop
43: *
44:    20 M = MOD(N,6)
45:       IF (M.EQ.0) GO TO 40
46:       DO 30 I = 1,M
47:           DTEMP = DTEMP + DABS(DX(I))
48:    30 CONTINUE
49:       IF (N.LT.6) GO TO 60
50:    40 MP1 = M + 1
51:       DO 50 I = MP1,N,6
52:           DTEMP = DTEMP + DABS(DX(I)) + DABS(DX(I+1)) + DABS(DX(I+2)) +
53:      +            DABS(DX(I+3)) + DABS(DX(I+4)) + DABS(DX(I+5))
54:    50 CONTINUE
55:    60 DASUM = DTEMP
56:       RETURN
57:       END
58: