#include "clapack.h" doublereal sasum_(integer *n, real *sx, integer *incx) { /* System generated locals */ integer i__1, i__2; real ret_val, r__1, r__2, r__3, r__4, r__5, r__6; /* Local variables */ integer i__, m, mp1, nincx; real stemp; /* .. Scalar Arguments .. */ /* .. */ /* .. Array Arguments .. */ /* .. */ /* Purpose */ /* ======= */ /* takes the sum of the absolute values. */ /* uses unrolled loops for increment equal to one. */ /* jack dongarra, linpack, 3/11/78. */ /* modified 3/93 to return if incx .le. 0. */ /* modified 12/3/93, array(1) declarations changed to array(*) */ /* .. Local Scalars .. */ /* .. */ /* .. Intrinsic Functions .. */ /* .. */ /* Parameter adjustments */ --sx; /* Function Body */ ret_val = 0.f; stemp = 0.f; if (*n <= 0 || *incx <= 0) { return ret_val; } if (*incx == 1) { goto L20; } /* code for increment not equal to 1 */ nincx = *n * *incx; i__1 = nincx; i__2 = *incx; for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) { stemp += (r__1 = sx[i__], dabs(r__1)); /* L10: */ } ret_val = stemp; return ret_val; /* code for increment equal to 1 */ /* clean-up loop */ L20: m = *n % 6; if (m == 0) { goto L40; } i__2 = m; for (i__ = 1; i__ <= i__2; ++i__) { stemp += (r__1 = sx[i__], dabs(r__1)); /* L30: */ } if (*n < 6) { goto L60; } L40: mp1 = m + 1; i__2 = *n; for (i__ = mp1; i__ <= i__2; i__ += 6) { stemp = stemp + (r__1 = sx[i__], dabs(r__1)) + (r__2 = sx[i__ + 1], dabs(r__2)) + (r__3 = sx[i__ + 2], dabs(r__3)) + (r__4 = sx[ i__ + 3], dabs(r__4)) + (r__5 = sx[i__ + 4], dabs(r__5)) + ( r__6 = sx[i__ + 5], dabs(r__6)); /* L50: */ } L60: ret_val = stemp; return ret_val; } /* sasum_ */