Lines Matching defs:log1p
17 /* double log1p(double x)
31 * 2. Approximation of log1p(f).
49 * log1p(f) = f - (hfsq - s*(hfsq+R)).
51 * 3. Finally, log1p(x) = k*ln2 + log1p(f).
58 * log1p(x) is NaN with signal if x < -1 (including -INF) ;
59 * log1p(+INF) is +INF; log1p(-1) is -INF with signal;
60 * log1p(NaN) is that NaN with no signal.
73 * algorithm can be used to compute log1p(x) to within a few ULP:
100 log1p(double x)
111 if(x==-1.0) return -two54/zero; /* log1p(-1)=+inf */
112 else return (x-x)/(x-x); /* log1p(x<-1)=NaN */
