51 lines
1.3 KiB
C++
51 lines
1.3 KiB
C++
#ifdef __cplusplus
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extern "C" {
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#endif
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#include "lmp_f2c.h"
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doublereal dasum_(integer *n, doublereal *dx, integer *incx)
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{
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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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integer i__, m, mp1;
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doublereal dtemp;
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integer nincx;
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--dx;
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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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m = *n % 6;
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if (m != 0) {
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i__1 = m;
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for (i__ = 1; i__ <= i__1; ++i__) {
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dtemp += (d__1 = dx[i__], abs(d__1));
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}
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if (*n < 6) {
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ret_val = dtemp;
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return ret_val;
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}
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}
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mp1 = m + 1;
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i__1 = *n;
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for (i__ = mp1; i__ <= i__1; i__ += 6) {
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dtemp = dtemp + (d__1 = dx[i__], abs(d__1)) + (d__2 = dx[i__ + 1], abs(d__2)) +
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(d__3 = dx[i__ + 2], abs(d__3)) + (d__4 = dx[i__ + 3], abs(d__4)) +
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(d__5 = dx[i__ + 4], abs(d__5)) + (d__6 = dx[i__ + 5], abs(d__6));
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}
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} else {
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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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}
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}
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ret_val = dtemp;
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return ret_val;
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}
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#ifdef __cplusplus
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}
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#endif
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