Lines Matching defs:log1p
13 /* double log1p(double x)
27 * 2. Approximation of log1p(f).
45 * log1p(f) = f - (hfsq - s*(hfsq+R)).
47 * 3. Finally, log1p(x) = k*ln2 + log1p(f).
54 * log1p(x) is NaN with signal if x < -1 (including -INF) ;
55 * log1p(+INF) is +INF; log1p(-1) is -INF with signal;
56 * log1p(NaN) is that NaN with no signal.
69 * algorithm can be used to compute log1p(x) to within a few ULP:
98 log1p(double x)
109 if(x==-1.0) return -two54/zero; /* log1p(-1)=+inf */
110 else return (x-x)/(x-x); /* log1p(x<-1)=NaN */
160 DEF_STD(log1p);
161 LDBL_MAYBE_CLONE(log1p);