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improve compensated summation in ias15 #890

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improve compensated summation in ias15 #890

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5 changes: 2 additions & 3 deletions src/integrator_ias15.c
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Original file line number Diff line number Diff line change
Expand Up @@ -157,9 +157,8 @@ static struct reb_dpconst7 dpcast(struct reb_dp7 dp){
}

static inline void add_cs(double* p, double* csp, double inp){
const double y = inp - *csp;
const double t = *p + y;
*csp = (t - *p) - y;
const double t = *p + (inp - *csp);
*csp += (t - *p) - inp;
*p = t;
}

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