Upgrade to 2022-era LLVM LIBCXX

2025-05-28 00:02:28 +00:00 · 2024-05-27 02:12:27 -07:00 · 2024-05-27 02:12:27 -07:00 · 8e68384e15
commit 8e68384e15
parent 2f4ca71f26
2078 changed files with 165657 additions and 65010 deletions
--- a/third_party/libcxx/__random/student_t_distribution.h
+++ b/third_party/libcxx/__random/student_t_distribution.h
@ -0,0 +1,156 @@
+//===----------------------------------------------------------------------===//
+//
+// 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_STUDENT_T_DISTRIBUTION_H
+#define _LIBCPP___RANDOM_STUDENT_T_DISTRIBUTION_H
+
+#include <__config>
+#include <__random/gamma_distribution.h>
+#include <__random/is_valid.h>
+#include <__random/normal_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 student_t_distribution
+{
+public:
+    // types
+    typedef _RealType result_type;
+
+    class _LIBCPP_TEMPLATE_VIS param_type
+    {
+        result_type __n_;
+    public:
+        typedef student_t_distribution distribution_type;
+
+        _LIBCPP_INLINE_VISIBILITY
+        explicit param_type(result_type __n = 1) : __n_(__n) {}
+
+        _LIBCPP_INLINE_VISIBILITY
+        result_type n() const {return __n_;}
+
+        friend _LIBCPP_INLINE_VISIBILITY
+            bool operator==(const param_type& __x, const param_type& __y)
+            {return __x.__n_ == __y.__n_;}
+        friend _LIBCPP_INLINE_VISIBILITY
+            bool operator!=(const param_type& __x, const param_type& __y)
+            {return !(__x == __y);}
+    };
+
+private:
+    param_type __p_;
+    normal_distribution<result_type> __nd_;
+
+public:
+    // constructor and reset functions
+#ifndef _LIBCPP_CXX03_LANG
+    _LIBCPP_INLINE_VISIBILITY
+    student_t_distribution() : student_t_distribution(1) {}
+    _LIBCPP_INLINE_VISIBILITY
+    explicit student_t_distribution(result_type __n)
+        : __p_(param_type(__n)) {}
+#else
+    _LIBCPP_INLINE_VISIBILITY
+    explicit student_t_distribution(result_type __n = 1)
+        : __p_(param_type(__n)) {}
+#endif
+    _LIBCPP_INLINE_VISIBILITY
+    explicit student_t_distribution(const param_type& __p)
+        : __p_(__p) {}
+    _LIBCPP_INLINE_VISIBILITY
+    void reset() {__nd_.reset();}
+
+    // generating functions
+    template<class _URNG>
+        _LIBCPP_INLINE_VISIBILITY
+        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_INLINE_VISIBILITY
+    result_type n() const {return __p_.n();}
+
+    _LIBCPP_INLINE_VISIBILITY
+    param_type param() const {return __p_;}
+    _LIBCPP_INLINE_VISIBILITY
+    void param(const param_type& __p) {__p_ = __p;}
+
+    _LIBCPP_INLINE_VISIBILITY
+    result_type min() const {return -numeric_limits<result_type>::infinity();}
+    _LIBCPP_INLINE_VISIBILITY
+    result_type max() const {return numeric_limits<result_type>::infinity();}
+
+    friend _LIBCPP_INLINE_VISIBILITY
+        bool operator==(const student_t_distribution& __x,
+                        const student_t_distribution& __y)
+        {return __x.__p_ == __y.__p_;}
+    friend _LIBCPP_INLINE_VISIBILITY
+        bool operator!=(const student_t_distribution& __x,
+                        const student_t_distribution& __y)
+        {return !(__x == __y);}
+};
+
+template <class _RealType>
+template<class _URNG>
+_RealType
+student_t_distribution<_RealType>::operator()(_URNG& __g, const param_type& __p)
+{
+    static_assert(__libcpp_random_is_valid_urng<_URNG>::value, "");
+    gamma_distribution<result_type> __gd(__p.n() * .5, 2);
+    return __nd_(__g) * _VSTD::sqrt(__p.n()/__gd(__g));
+}
+
+template <class _CharT, class _Traits, class _RT>
+_LIBCPP_HIDE_FROM_ABI basic_ostream<_CharT, _Traits>&
+operator<<(basic_ostream<_CharT, _Traits>& __os,
+           const student_t_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);
+    __os << __x.n();
+    return __os;
+}
+
+template <class _CharT, class _Traits, class _RT>
+_LIBCPP_HIDE_FROM_ABI basic_istream<_CharT, _Traits>&
+operator>>(basic_istream<_CharT, _Traits>& __is,
+           student_t_distribution<_RT>& __x)
+{
+    typedef student_t_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 __n;
+    __is >> __n;
+    if (!__is.fail())
+        __x.param(param_type(__n));
+    return __is;
+}
+
+_LIBCPP_END_NAMESPACE_STD
+
+_LIBCPP_POP_MACROS
+
+#endif // _LIBCPP___RANDOM_STUDENT_T_DISTRIBUTION_H