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Fix lgamma_r linking errors on Windows. It appears the normal lgamma function is thread safe anyway

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@302330 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-05-06 02:58:43 +00:00
parent 5dbf234992
commit a9f9f0b205
1 changed files with 14 additions and 4 deletions
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18
include/random
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@@ -3997,7 +3997,18 @@ public:
{return !(__x == __y);}
};
#ifndef _LIBCPP_MSVCRT
extern "C" double lgamma_r(double, int *);
#endif
inline _LIBCPP_INLINE_VISIBILITY double __libcpp_lgamma(double __d) {
#if defined(_LIBCPP_MSVCRT)
return lgamma(__d);
#else
int __sign;
return lgamma_r(__d, &__sign);
#endif
}
template<class _IntType>
binomial_distribution<_IntType>::param_type::param_type(const result_type __t, const double __p)
@@ -4005,11 +4016,10 @@ binomial_distribution<_IntType>::param_type::param_type(const result_type __t, c
{
if (0 < __p_ && __p_ < 1)
{
int __sign;
__r0_ = static_cast<result_type>((__t_ + 1) * __p_);
__pr_ = _VSTD::exp(lgamma_r(__t_ + 1., &__sign) -
lgamma_r(__r0_ + 1., &__sign) -
lgamma_r(__t_ - __r0_ + 1., &__sign) + __r0_ * _VSTD::log(__p_) +
__pr_ = _VSTD::exp(__libcpp_lgamma(__t_ + 1.) -
__libcpp_lgamma(__r0_ + 1.) -
__libcpp_lgamma(__t_ - __r0_ + 1.) + __r0_ * _VSTD::log(__p_) +
(__t_ - __r0_) * _VSTD::log(1 - __p_));
__odds_ratio_ = __p_ / (1 - __p_);
}