https://github.com/python/cpython
- HEAD
- refs/heads/3.10
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- refs/heads/dependabot/pip/Tools/hypothesis-6.100.0
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Tip revision: f9774e57d84162ff0cba0b17a3dcdb93dfbce45e authored by Thomas Wouters on 07 March 2023, 21:41:50 UTC
Python 3.12.0a6
Python 3.12.0a6
Tip revision: f9774e5
_math.h
/* log1p(x) = log(1+x). The log1p function is designed to avoid the
significant loss of precision that arises from direct evaluation when x is
small. Use the substitute from _math.h on all platforms: it includes
workarounds for buggy handling of zeros.
*/
static double
_Py_log1p(double x)
{
/* Some platforms (e.g. MacOS X 10.8, see gh-59682) supply a log1p function
but don't respect the sign of zero: log1p(-0.0) gives 0.0 instead of
the correct result of -0.0.
To save fiddling with configure tests and platform checks, we handle the
special case of zero input directly on all platforms.
*/
if (x == 0.0) {
return x;
}
else {
return log1p(x);
}
}
#define m_log1p _Py_log1p