73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
#include "blaswrap.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "f2c.h"
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doublereal dasum_(integer *n, doublereal *dx, integer *incx)
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{
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/* System generated locals */
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integer i__1, i__2;
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doublereal ret_val, d__1, d__2, d__3, d__4, d__5, d__6;
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/* Local variables */
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static integer i__, m;
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static doublereal dtemp;
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static integer nincx, mp1;
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/* takes the sum of the absolute values.
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jack dongarra, linpack, 3/11/78.
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modified 3/93 to return if incx .le. 0.
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modified 12/3/93, array(1) declarations changed to array(*)
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Parameter adjustments */
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--dx;
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/* Function Body */
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ret_val = 0.;
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dtemp = 0.;
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if (*n <= 0 || *incx <= 0) {
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return ret_val;
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}
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if (*incx == 1) {
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goto L20;
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}
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/* code for increment not equal to 1 */
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nincx = *n * *incx;
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i__1 = nincx;
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i__2 = *incx;
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for (i__ = 1; i__2 < 0 ? i__ >= i__1 : i__ <= i__1; i__ += i__2) {
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dtemp += (d__1 = dx[i__], abs(d__1));
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/* L10: */
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}
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ret_val = dtemp;
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return ret_val;
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/* code for increment equal to 1
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clean-up loop */
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L20:
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m = *n % 6;
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if (m == 0) {
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goto L40;
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}
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i__2 = m;
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for (i__ = 1; i__ <= i__2; ++i__) {
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dtemp += (d__1 = dx[i__], abs(d__1));
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/* L30: */
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}
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if (*n < 6) {
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goto L60;
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}
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L40:
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mp1 = m + 1;
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i__2 = *n;
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for (i__ = mp1; i__ <= i__2; i__ += 6) {
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dtemp = dtemp + (d__1 = dx[i__], abs(d__1)) + (d__2 = dx[i__ + 1],
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abs(d__2)) + (d__3 = dx[i__ + 2], abs(d__3)) + (d__4 = dx[i__
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+ 3], abs(d__4)) + (d__5 = dx[i__ + 4], abs(d__5)) + (d__6 =
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dx[i__ + 5], abs(d__6));
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/* L50: */
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}
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L60:
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ret_val = dtemp;
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return ret_val;
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} /* dasum_ */
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#ifdef __cplusplus
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}
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#endif
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