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/bionic/libm/src/
H A Ds_log1p.c17 /* 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(
100 log1p(double x) function
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