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- /* sasum.f -- translated by f2c (version 20061008).
- You must link the resulting object file with libf2c:
- on Microsoft Windows system, link with libf2c.lib;
- on Linux or Unix systems, link with .../path/to/libf2c.a -lm
- or, if you install libf2c.a in a standard place, with -lf2c -lm
- -- in that order, at the end of the command line, as in
- cc *.o -lf2c -lm
- Source for libf2c is in /netlib/f2c/libf2c.zip, e.g.,
- http://www.netlib.org/f2c/libf2c.zip
- */
- #include "f2c.h"
- #include "blaswrap.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_ */
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