Lines Matching defs:log1p
27 /* double log1p(double x)
41 * 2. Approximation of log1p(f).
59 * log1p(f) = f - (hfsq - s*(hfsq+R)).
61 * 3. Finally, log1p(x) = k*ln2 + log1p(f).
68 * log1p(x) is NaN with signal if x < -1 (including -INF) ;
69 * log1p(+INF) is +INF; log1p(-1) is -INF with signal;
70 * log1p(NaN) is that NaN with no signal.
83 * algorithm can be used to compute log1p(x) to within a few ULP:
113 double log1p(double x)
115 double log1p(x)
132 if(x==-1.0 && (hx==0xbff00000)) /* log1p(-1)=-inf */
135 return (x-x)/(x-x); /* log1p(x<-1)=NaN */