1 files changed, 176 insertions, 0 deletions
diff --git a/contrib/llvm-project/libcxx/include/__random/normal_distribution.h b/contrib/llvm-project/libcxx/include/__random/normal_distribution.h
new file mode 100644
index 000000000000..889f189e4161
--- /dev/null
+++ b/contrib/llvm-project/libcxx/include/__random/normal_distribution.h
@@ -0,0 +1,176 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___RANDOM_NORMAL_DISTRIBUTION_H
+#define _LIBCPP___RANDOM_NORMAL_DISTRIBUTION_H
+
+#include <__config>
+#include <__random/is_valid.h>
+#include <__random/uniform_real_distribution.h>
+#include <cmath>
+#include <iosfwd>
+#include <limits>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+#  pragma GCC system_header
+#endif
+
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+template <class _RealType = double>
+class _LIBCPP_TEMPLATE_VIS normal_distribution {
+  static_assert(__libcpp_random_is_valid_realtype<_RealType>::value,
+                "RealType must be a supported floating-point type");
+
+public:
+  // types
+  typedef _RealType result_type;
+
+  class _LIBCPP_TEMPLATE_VIS param_type {
+    result_type __mean_;
+    result_type __stddev_;
+
+  public:
+    typedef normal_distribution distribution_type;
+
+    _LIBCPP_HIDE_FROM_ABI explicit param_type(result_type __mean = 0, result_type __stddev = 1)
+        : __mean_(__mean), __stddev_(__stddev) {}
+
+    _LIBCPP_HIDE_FROM_ABI result_type mean() const { return __mean_; }
+    _LIBCPP_HIDE_FROM_ABI result_type stddev() const { return __stddev_; }
+
+    friend _LIBCPP_HIDE_FROM_ABI bool operator==(const param_type& __x, const param_type& __y) {
+      return __x.__mean_ == __y.__mean_ && __x.__stddev_ == __y.__stddev_;
+    }
+    friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const param_type& __x, const param_type& __y) { return !(__x == __y); }
+  };
+
+private:
+  param_type __p_;
+  result_type __v_;
+  bool __v_hot_;
+
+public:
+  // constructors and reset functions
+#ifndef _LIBCPP_CXX03_LANG
+  _LIBCPP_HIDE_FROM_ABI normal_distribution() : normal_distribution(0) {}
+  _LIBCPP_HIDE_FROM_ABI explicit normal_distribution(result_type __mean, result_type __stddev = 1)
+      : __p_(param_type(__mean, __stddev)), __v_hot_(false) {}
+#else
+  _LIBCPP_HIDE_FROM_ABI explicit normal_distribution(result_type __mean = 0, result_type __stddev = 1)
+      : __p_(param_type(__mean, __stddev)), __v_hot_(false) {}
+#endif
+  _LIBCPP_HIDE_FROM_ABI explicit normal_distribution(const param_type& __p) : __p_(__p), __v_hot_(false) {}
+  _LIBCPP_HIDE_FROM_ABI void reset() { __v_hot_ = false; }
+
+  // generating functions
+  template <class _URNG>
+  _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g) {
+    return (*this)(__g, __p_);
+  }
+  template <class _URNG>
+  _LIBCPP_HIDE_FROM_ABI result_type operator()(_URNG& __g, const param_type& __p);
+
+  // property functions
+  _LIBCPP_HIDE_FROM_ABI result_type mean() const { return __p_.mean(); }
+  _LIBCPP_HIDE_FROM_ABI result_type stddev() const { return __p_.stddev(); }
+
+  _LIBCPP_HIDE_FROM_ABI param_type param() const { return __p_; }
+  _LIBCPP_HIDE_FROM_ABI void param(const param_type& __p) { __p_ = __p; }
+
+  _LIBCPP_HIDE_FROM_ABI result_type min() const { return -numeric_limits<result_type>::infinity(); }
+  _LIBCPP_HIDE_FROM_ABI result_type max() const { return numeric_limits<result_type>::infinity(); }
+
+  friend _LIBCPP_HIDE_FROM_ABI bool operator==(const normal_distribution& __x, const normal_distribution& __y) {
+    return __x.__p_ == __y.__p_ && __x.__v_hot_ == __y.__v_hot_ && (!__x.__v_hot_ || __x.__v_ == __y.__v_);
+  }
+  friend _LIBCPP_HIDE_FROM_ABI bool operator!=(const normal_distribution& __x, const normal_distribution& __y) {
+    return !(__x == __y);
+  }
+
+  template <class _CharT, class _Traits, class _RT>
+  friend basic_ostream<_CharT, _Traits>&
+  operator<<(basic_ostream<_CharT, _Traits>& __os, const normal_distribution<_RT>& __x);
+
+  template <class _CharT, class _Traits, class _RT>
+  friend basic_istream<_CharT, _Traits>&
+  operator>>(basic_istream<_CharT, _Traits>& __is, normal_distribution<_RT>& __x);
+};
+
+template <class _RealType>
+template <class _URNG>
+_RealType normal_distribution<_RealType>::operator()(_URNG& __g, const param_type& __p) {
+  static_assert(__libcpp_random_is_valid_urng<_URNG>::value, "");
+  result_type __up;
+  if (__v_hot_) {
+    __v_hot_ = false;
+    __up     = __v_;
+  } else {
+    uniform_real_distribution<result_type> __uni(-1, 1);
+    result_type __u;
+    result_type __v;
+    result_type __s;
+    do {
+      __u = __uni(__g);
+      __v = __uni(__g);
+      __s = __u * __u + __v * __v;
+    } while (__s > 1 || __s == 0);
+    result_type __fp = std::sqrt(-2 * std::log(__s) / __s);
+    __v_             = __v * __fp;
+    __v_hot_         = true;
+    __up             = __u * __fp;
+  }
+  return __up * __p.stddev() + __p.mean();
+}
+
+template <class _CharT, class _Traits, class _RT>
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os, const normal_distribution<_RT>& __x) {
+  __save_flags<_CharT, _Traits> __lx(__os);
+  typedef basic_ostream<_CharT, _Traits> _OStream;
+  __os.flags(_OStream::dec | _OStream::left | _OStream::fixed | _OStream::scientific);
+  _CharT __sp = __os.widen(' ');
+  __os.fill(__sp);
+  __os << __x.mean() << __sp << __x.stddev() << __sp << __x.__v_hot_;
+  if (__x.__v_hot_)
+    __os << __sp << __x.__v_;
+  return __os;
+}
+
+template <class _CharT, class _Traits, class _RT>
+_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is, normal_distribution<_RT>& __x) {
+  typedef normal_distribution<_RT> _Eng;
+  typedef typename _Eng::result_type result_type;
+  typedef typename _Eng::param_type param_type;
+  __save_flags<_CharT, _Traits> __lx(__is);
+  typedef basic_istream<_CharT, _Traits> _Istream;
+  __is.flags(_Istream::dec | _Istream::skipws);
+  result_type __mean;
+  result_type __stddev;
+  result_type __vp = 0;
+  bool __v_hot     = false;
+  __is >> __mean >> __stddev >> __v_hot;
+  if (__v_hot)
+    __is >> __vp;
+  if (!__is.fail()) {
+    __x.param(param_type(__mean, __stddev));
+    __x.__v_hot_ = __v_hot;
+    __x.__v_     = __vp;
+  }
+  return __is;
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___RANDOM_NORMAL_DISTRIBUTION_H