Implements Philox Engine (P2075R6) and associated tests.
Curiously, the ordering for the template unpacking functions
caused a bug in which ordering mattered. As such, counter to
the recommended style, they are placed in a private classifier
prior to the public block. I was unable to find a way around this.
Additionally, this patch does not utilize SIMD instructions,
although it could technically be a possible point of interest. In its
current state, I don't believe their inclusion would be particularly
useful, although with some restructuring of how the internal state
is managed, they may be.
Also, since the word width can be specified (and thus atypical),
calculation of the max size does not use numeric_limits, but rather
sets the top bit of the specified width and turns on trailing 0s. This is
indistinguishable from the end result of numeric_limits, but provides
further flexibility in the case of a user-specified size outside the norm
where the maximum value of a register is not equal to the maximum
value of the specified word length.
Built and tested on x86_64-linux-gnu.
1nfocalypse
From 69db1ff9e7b8ace24cd4da246f3481a4544a9aec Mon Sep 17 00:00:00 2001
From: 1nfocalypse <1nfocaly...@protonmail.com>
Date: Tue, 20 May 2025 04:28:42 +0000
Subject: [PATCH] [PATCH] libstdc++: implement Philox Engine (P2075R6)
This commit implements P2075R6 for C++26, adding the Philox Engine.
The template unpacking functions, while private, are placed prior
to the public access specifier due to issues where the template
pack could not be unpacked and used to populate the public member
arrays without being declared beforehand.
Additionally, the tests implemented attempt to mirror the tests
for other engines, when they apply. Lastly, changes to random
provided cause for changing 'pr60037-neg.cc' because it suppresses
an error by explicit line number. It should still be correctly
suppressed in this patch.
PR libstdc++/119794
libstdc++-v3/ChangeLog:
* include/bits/random.h: Add Philox Engine components.
* include/bits/random.tcc: Implement Philox Engine components.
* testsuite/26_numerics/random/pr60037-neg.cc: Alter line number
* testsuite/26_numerics/random/inequal.cc: New test.
* testsuite/26_numerics/random/philox4x32.cc: New test.
* testsuite/26_numerics/random/philox4x64.cc: New test.
* testsuite/26_numerics/random/philox_engine/cons/119794.cc: New
test.
* testsuite/26_numerics/random/philox_engine/cons/copy.cc: New
test.
* testsuite/26_numerics/random/philox_engine/cons/default.cc: New
test.
* testsuite/26_numerics/random/philox_engine/cons/seed.cc: New
test.
* testsuite/26_numerics/random/philox_engine/cons/seed_seq.cc:
New test.
* testsuite/26_numerics/random/philox_engine/operators/equal.cc:
New test.
* testsuite/26_numerics/random/philox_engine/operators/inequal.cc:
New test.
* testsuite/26_numerics/random/philox_engine/operators/
serialize.cc: New test.
* testsuite/26_numerics/random/philox_engine/requirements/
constants.cc: New test.
* testsuite/26_numerics/random/philox_engine/requirements/
constexpr_data.cc: New test.
* testsuite/26_numerics/random/philox_engine/requirements/
constexpr_functions.cc: New test.
* testsuite/26_numerics/random/philox_engine/requirements/
typedefs.cc: New test.
---
libstdc++-v3/include/bits/random.h | 340 ++++++++++++++++++
libstdc++-v3/include/bits/random.tcc | 201 +++++++++++
.../testsuite/26_numerics/random/inequal.cc | 49 +++
.../26_numerics/random/philox4x32.cc | 42 +++
.../26_numerics/random/philox4x64.cc | 44 +++
.../random/philox_engine/cons/119794.cc | 58 +++
.../random/philox_engine/cons/copy.cc | 45 +++
.../random/philox_engine/cons/default.cc | 46 +++
.../random/philox_engine/cons/seed.cc | 39 ++
.../random/philox_engine/cons/seed_seq.cc | 42 +++
.../random/philox_engine/operators/equal.cc | 50 +++
.../random/philox_engine/operators/inequal.cc | 49 +++
.../philox_engine/operators/serialize.cc | 69 ++++
.../philox_engine/requirements/constants.cc | 45 +++
.../requirements/constexpr_data.cc | 69 ++++
.../requirements/constexpr_functions.cc | 61 ++++
.../philox_engine/requirements/typedefs.cc | 45 +++
.../26_numerics/random/pr60037-neg.cc | 2 +-
18 files changed, 1295 insertions(+), 1 deletion(-)
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/inequal.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox4x32.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox4x64.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/119794.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/copy.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/default.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed_seq.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/equal.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/inequal.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/serialize.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constants.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_data.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_functions.cc
create mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/typedefs.cc
diff --git a/libstdc++-v3/include/bits/random.h b/libstdc++-v3/include/bits/random.h
index 1fdaf51934f..1000faabb79 100644
--- a/libstdc++-v3/include/bits/random.h
+++ b/libstdc++-v3/include/bits/random.h
@@ -1688,6 +1688,328 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{ return !(__lhs == __rhs); }
#endif
+#if __cplusplus > 202302L
+
+ /**
+ * @brief: A discrete pseudorandom number generator based off of weakened
+ * cryptographic primitives.
+ *
+ * This algorithm was intended to be used for highly parallel random number
+ * generation, and is capable of immensely long periods. It provides "Crush-
+ * resistance", denoting an ability to pass the TestU01 Suite's "Big Crush"
+ * test, demonstrating significant apparent entropy. It is not intended for
+ * cryptographic use and should not be used for such, despite being based on
+ * cryptographic primitives.
+ *
+ * The two four-word definitions are likely the best use for this algorithm,
+ * and are given below as defaults.
+ *
+ * This algorithm was created by John Salmon, Mark Moraes, Ron Dror, and
+ * David Shaw as a product of D.E. Shaw Research.
+ *
+ * @tparam __w Word size
+ * @tparam __n Buffer size
+ * @tparam __r Rounds
+ * @tparam __consts Multiplication and round constant pack, ordered as
+ * M_{0}, C_{0}, M_{1}, C_{1}, ... , M_{N/2-1}, C_{N/2-1}
+ *
+ * @headerfile random
+ * @since C++26
+ */
+ template<class _UIntType, size_t __w,
+ size_t __n, size_t __r,
+ _UIntType... __consts>
+ class philox_engine
+ {
+ static_assert(__n == 2 || __n == 4,
+ "template argument N must be either 2 or 4");
+ static_assert(sizeof...(__consts) == __n,
+ "length of consts array must match specified N");
+ static_assert(0 < __r, "a number of rounds must be specified");
+ static_assert((0 < __w && __w <= numeric_limits<_UIntType>::digits)==1,
+ "specified bitlength must match input type");
+ template<typename _Sseq>
+ using _If_seed_seq
+ = __detail::_If_seed_seq_for<_Sseq, philox_engine, _UIntType>;
+
+ private:
+ // the ordering here is essential to functionality.
+ /** @brief an internal unpacking function for %philox_engine. */
+ static constexpr
+ std::array<_UIntType, __n / 2>
+ __popMultArray()
+ {
+ if constexpr (__n == 4)
+ {
+ return
+ std::array<_UIntType, __n / 2> {__consts...[0], __consts...[2]};
+ } else
+ {
+ return std::array<_UIntType, __n / 2> { __consts...[0] };
+ }
+ }
+
+ /** @brief an internal unpacking function for %philox_engine. */
+ static constexpr
+ std::array<_UIntType, __n / 2>
+ __popConstArray()
+ {
+ if constexpr (__n == 4)
+ {
+ return
+ std::array<_UIntType, __n / 2> {__consts...[1], __consts...[3]};
+ } else
+ {
+ return std::array<_UIntType, __n / 2> {__consts...[1] };
+ }
+ }
+
+ public:
+ /** Type of template param. */
+ using result_type = _UIntType;
+ // public members
+ static constexpr size_t word_size = __w;
+ static constexpr size_t word_count = __n;
+ static constexpr size_t round_count = __r;
+ static constexpr std::array<result_type, __n / 2> multipliers =
+ philox_engine::__popMultArray();
+ static constexpr std::array<result_type, __n / 2> round_consts =
+ philox_engine::__popConstArray();
+
+ /** @brief returns the minimum value possible. */
+ static constexpr result_type
+ min()
+ { return 0; }
+
+ /** @brief returns the maximum value possible. */
+ static constexpr result_type
+ max()
+ {
+ return ((1ull << (__w - 1)) | ((1ull << (__w - 1)) - 1));
+ }
+ // default key value
+ static constexpr result_type default_seed = 20111115u;
+
+ // constructors
+ philox_engine()
+ : philox_engine(default_seed)
+ {}
+
+ explicit
+ philox_engine(result_type __value);
+
+ /** @brief seed sequence constructor for %philox_engine
+ *
+ * @params __q the seed sequence
+ */
+ template<typename _Sseq, typename = _If_seed_seq<_Sseq>>
+ explicit
+ philox_engine(_Sseq& __q)
+ {
+ seed(__q);
+ }
+
+
+ void
+ seed(result_type value = default_seed);
+
+ /** @brief seeds %philox_engine by seed sequence
+ *
+ * @params __q the seed sequence
+ */
+ template<typename _Sseq>
+ _If_seed_seq<_Sseq>
+ seed(_Sseq& __q);
+
+ /** @brief sets the internal counter "cleartext"
+ *
+ * @params __counter std::array of len N
+ */
+ void
+ set_counter(const std::array<result_type, __n>& __counter);
+
+ /** @brief compares two %philox_engine objects
+ *
+ * @params __x A %philox_engine object
+ * @params __y A %philox_engine object
+ *
+ * @returns true if the objects will produce an identical stream, false
+ * otherwise
+ */
+ friend bool
+ operator==(const philox_engine& __x, const philox_engine& __y)
+ {
+ return
+ {
+ std::equal(__x.__x.begin(), __x.__x.end(),
+ __y.__x.begin(), __y.__x.end()) &&
+ std::equal(__x.__y.begin(), __x.__y.end(),
+ __y.__y.begin(), __y.__y.end()) &&
+ std::equal(__x.__k.begin(), __x.__k.end(),
+ __y.__k.begin(), __y.__k.end()) &&
+ __x.__i == __y.__i
+ };
+ }
+
+
+ _UIntType
+ operator()();
+
+ /** @brief discards __z numbers
+ *
+ * @params __z number of iterations to discard
+ */
+ void
+ discard(unsigned long long __z);
+
+ // Note: hidden friend seems best, suspect a better way of doing things
+ // but unable to find it
+ /** @brief outputs the state of the generator
+ *
+ * @param __os An output stream.
+ * @param __x A %philox_engine object reference
+ *
+ * @returns the state of the Philox Engine in __os
+ */
+ template<typename _charT, typename _traits>
+ friend basic_ostream<_charT, _traits>&
+ operator<<(basic_ostream<_charT, _traits>& __os,
+ const philox_engine& __x)
+ {
+ using __ios_base =
+ typename basic_ostream<_charT, _traits>::ios_base;
+ const typename __ios_base::fmtflags __flags = __os.flags();
+ const _charT __fill = __os.fill();
+ __os.flags(__ios_base::dec | __ios_base::left);
+ __os.fill(__os.widen(' '));
+ auto __it = __x.__k.begin();
+ while (__it != __x.__k.end())
+ {
+ __os << *__it << ' ';
+ ++__it;
+ }
+ auto __it2 = __x.__x.begin();
+ while (__it2 != __x.__x.end())
+ {
+ __os << *__it2 << ' ';
+ ++__it2;
+ }
+ __os << __x.__i;
+ __os.flags(__flags);
+ __os.fill(__fill);
+ return __os;
+ }
+
+ /** @brief takes input to set the state of the %philox_engine object
+ *
+ * @param __is An input stream.
+ * @param __x A %philox_engine object reference
+ *
+ * @returns %philox_engine object is set with values from instream
+ */
+ template <typename _charT, typename _traits>
+ friend basic_istream<_charT, _traits>&
+ operator>>(basic_istream<_charT, _traits>& __is,
+ philox_engine& __x)
+ {
+ using __ios_base =
+ typename basic_istream<_charT, _traits>::ios_base;
+ const typename __ios_base::fmtflags __flags = __is.flags();
+ __is.flags(__ios_base::dec | __ios_base::skipws);
+ for (size_t __j = 0; __j < __x.__k.size(); ++__j)
+ {
+ __is >> __x.__k[__j];
+ }
+ for (size_t __j = 0; __j < __x.__x.size(); ++__j)
+ {
+ __is >> __x.__x[__j];
+ }
+ std::array<_UIntType, __n> __tmpCtr = __x.__x;
+ unsigned char __setIndex = 0;
+ for (size_t __j = 0; __j < __x.__x.size(); ++__j)
+ {
+ if (__x.__x[__j] > 0)
+ {
+ __setIndex = __j;
+ break;
+ }
+ }
+ for (size_t __j = 0; __j <= __setIndex; ++__j)
+ {
+ if (__j != __setIndex)
+ {
+ __x.__x[__j] = max();
+ } else
+ {
+ --__x.__x[__j];
+ }
+ }
+ __x.__philox();
+ __x.__x = __tmpCtr;
+ __is >> __x.__i;
+ __is.flags(__flags);
+ return __is;
+ }
+ private:
+ // private state variables
+ std::array<_UIntType, __n> __x;
+ std::array<_UIntType, __n / 2> __k;
+ std::array<_UIntType, __n> __y;
+ unsigned long long __i = 0;
+
+ /** @brief Takes the high values of the product of __a, __b
+ *
+ * @params __a an unsigned integer
+ * @params __b an unsigned integer
+ *
+ * @returns an unsigned integer of at most bitlength W
+ */
+ _UIntType
+ __mulhi(_UIntType __a, _UIntType __b); // (A*B)/2^W
+
+ /** @brief Takes the low values of the product of __a, __b
+ *
+ * @params __a an unsigned integer
+ * @params __b an unsigned integer
+ *
+ * @returns an unsigned integer of at most bitlength W
+ */
+ _UIntType
+ __mullo(_UIntType __a, _UIntType __b); // (A*B)%2^W
+
+ /** @brief an R-round SP-net followed by a Feistel Network for
+ * %philox_engine
+ */
+ void
+ __philox();
+
+ /** @brief an internal transition function for the %philox_engine. */
+ void
+ __transition();
+ };
+
+ /**
+ * Compares two %philox_engine random number generator objects
+ * of the same type for inequality.
+ *
+ * @param __lhs A %philox_engine random number generator object.
+ * @param __rhs Another %philox_engine random number generator
+ * object.
+ *
+ * @returns true if the streams would be different, false otherwise.
+ */
+ template<class _UIntType, size_t __w,
+ size_t __n, size_t __r,
+ _UIntType... __consts>
+ inline bool
+ operator!=(const std::philox_engine<_UIntType, __w,
+ __n, __r, __consts...>& __lhs,
+ const std::philox_engine<_UIntType, __w,
+ __n, __r, __consts...>& __rhs)
+ { return !(__lhs == __rhs); }
+
+#endif
+
/**
* The classic Minimum Standard rand0 of Lewis, Goodman, and Miller.
*/
@@ -1742,6 +2064,24 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typedef minstd_rand0 default_random_engine;
+#if __cplusplus > 202302L
+
+ typedef philox_engine<
+ uint_fast32_t,
+ 32, 4, 10,
+ 0xCD9E8D57, 0x9E3779B9,
+ 0xD2511F53, 0xBB67AE85> philox4x32;
+
+ /**
+ * Alternative Philox instance (64 bit)
+ */
+ typedef philox_engine<
+ std::uint_fast64_t,
+ 64, 4, 10,
+ 0xCA5A826395121157, 0x9E3779B97F4A7C15,
+ 0xD2E7470EE14C6C93, 0xBB67AE8584CAA73B> philox4x64;
+#endif
+
/**
* A standard interface to a platform-specific non-deterministic
* random number generator (if any are available).
diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc
index 53ccacb2e38..faba3b6d4b5 100644
--- a/libstdc++-v3/include/bits/random.tcc
+++ b/libstdc++-v3/include/bits/random.tcc
@@ -518,6 +518,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return __is;
}
+
+
#if ! __cpp_inline_variables
template<typename _UIntType, size_t __w, size_t __s, size_t __r>
constexpr size_t
@@ -907,6 +909,205 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
return __is;
}
+#if __cplusplus > 202302L
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ _UIntType
+ std::philox_engine<_UIntType,
+ __w, __n, __r, __consts...>::__mulhi(_UIntType __a, _UIntType __b)
+ {
+ const __uint128_t __num =
+ static_cast<__uint128_t>(__a) * static_cast<__uint128_t>(__b);
+ const __uint128_t __div = (static_cast<__uint128_t>(1) << __w);
+ return static_cast<_UIntType>((__num / __div) & this->max());
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ _UIntType
+ std::philox_engine<_UIntType,
+ __w, __n, __r, __consts...>::__mullo(_UIntType __a, _UIntType __b)
+ {
+ return ((__a * __b) & max());
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ void
+ std::philox_engine<_UIntType, __w, __n, __r, __consts...>::__transition()
+ {
+ ++__i;
+ if (__i == __n)
+ {
+ __philox();
+ if (__n == 4)
+ {
+ __uint128_t __uh =
+ {
+ (static_cast<__uint128_t>(this->__x[1]) << __w)
+ | ((this->__x[0]) + 1)
+ };
+ __uint128_t __lh =
+ {
+ ((static_cast<__uint128_t>(this->__x[3]) << __w)
+ | (this->__x[2]))
+ };
+ if (!(__uh & this->max()))
+ {
+ ++__lh;
+ __uh = 0;
+ }
+ this->__x[0] = __uh & this->max();
+ this->__x[1] = (__uh >> (__w)) & this->max();
+ this->__x[2] = __lh & this->max();
+ this->__x[3] = (__lh >> (__w)) & this->max();
+ } else
+ {
+ __uint128_t __num = ((this->__x[1] << __w)) | ((this->__x[0]) + 1);
+ this->__x[0] = __num & this->max();
+ this->__x[1] = (__num >> __w) & this->max();
+ }
+ __i = 0;
+ }
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ void
+ std::philox_engine<_UIntType, __w, __n, __r, __consts...>::__philox()
+ {
+ std::array<_UIntType, __n> __outputSeq{};
+ for (size_t __j = 0; __j < __n; ++__j)
+ {
+ __outputSeq[__j] = __x[__j];
+ }
+ for (unsigned long __j = 0; __j < __r; ++__j)
+ {
+ std::array<_UIntType, __n> __intermedSeq{};
+ if (__n == 4)
+ {
+ __intermedSeq[0] = __outputSeq[2];
+ __intermedSeq[1] = __outputSeq[1];
+ __intermedSeq[2] = __outputSeq[0];
+ __intermedSeq[3] = __outputSeq[3];
+ } else
+ {
+ __intermedSeq[0] = __outputSeq[0];
+ __intermedSeq[1] = __outputSeq[1];
+ }
+ for (unsigned long __k = 0; __k < (__n/2); ++__k)
+ {
+ __outputSeq[2*__k]= __mulhi(__intermedSeq[2*__k], multipliers[__k])
+ ^ (((this->__k[__k] + (__j * round_consts[__k])) & this->max()))
+ ^ __intermedSeq[2*__k+1];
+
+ __outputSeq[(2*__k)+1]= __mullo(__intermedSeq[2*__k],
+ multipliers[__k]);
+ }
+ }
+ for (unsigned long __j = 0; __j < __n; ++__j)
+ {
+ __y[__j] = __outputSeq[__j];
+ }
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ std::philox_engine<_UIntType,
+ __w, __n, __r, __consts...>::philox_engine(result_type __value)
+ {
+ std::fill(__x.begin(), __x.end(), 0);
+ std::fill(__k.begin(), __k.end(), 0);
+ std::fill(__y.begin(), __y.end(), 0);
+ __k[0] = __value & this->max();
+ __i = __n - 1;
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ void
+ std::philox_engine<_UIntType,
+ __w, __n, __r, __consts...>::seed(result_type __value)
+ {
+ std::fill(__x.begin(), __x.end(), 0);
+ std::fill(__k.begin(), __k.end(), 0);
+ std::fill(__y.begin(), __y.end(), 0);
+ __k[0] = __value & this->max();
+ __i = __n - 1;
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ void
+ std::philox_engine<_UIntType, __w,
+ __n, __r, __consts...>::set_counter(const array<result_type, __n>& __counter)
+ {
+ for (unsigned long long __j = 0; __j < __n; ++__j)
+ {
+ __x[__j] = __counter[__n - 1 - __j] & this->max();
+ }
+ __i = __n - 1;
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ template<typename _Sseq>
+ auto
+ std::philox_engine<_UIntType, __w, __n, __r, __consts...>::seed(_Sseq& __q)
+ -> _If_seed_seq<_Sseq>
+ {
+ std::fill(__k.begin(), __k.end(), 0);
+ const unsigned long long __p = 1 + ((__w - 1/ 32));
+ uint_least32_t __tmpArr[(__n / 2) * __p];
+ __q.generate(__tmpArr + 0, __tmpArr + ((__n / 2) *__p));
+ for (unsigned long long __k = 0; __k < (__n/2) - 1; ++__k)
+ {
+ unsigned long long __precalc = 0;
+ for (unsigned long long __j = 0; __j < __p; ++__j)
+ {
+ unsigned long long __multiplicand = (1ull << (32 * __j - 1));
+ __precalc += (__tmpArr[__k*__p + __j] * __multiplicand) & this->max();
+ }
+ this->__k[__k] = __precalc;
+ }
+ std::fill(__x.begin(), __x.end(), 0);
+ std::fill(__y.begin(), __y.begin(), 0);
+ __i = __n - 1;
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ void
+ std::philox_engine<_UIntType,
+ __w, __n, __r, __consts...>::discard(unsigned long long __z)
+ {
+ for (unsigned long long __j = 0; __j < __z; ++__j)
+ {
+ __transition();
+ }
+ }
+
+ template<class _UIntType,
+ size_t __w, size_t __n,
+ size_t __r, _UIntType... __consts>
+ _UIntType
+ std::philox_engine<_UIntType, __w, __n, __r, __consts...>::operator()()
+ {
+ __transition();
+ return __y[__i];
+ }
+
+#endif
template<typename _IntType, typename _CharT, typename _Traits>
std::basic_ostream<_CharT, _Traits>&
diff --git a/libstdc++-v3/testsuite/26_numerics/random/inequal.cc b/libstdc++-v3/testsuite/26_numerics/random/inequal.cc
new file mode 100644
index 00000000000..081c908a3eb
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/inequal.cc
@@ -0,0 +1,49 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> x, y;
+
+ VERIFY ( !(x != y) );
+ x.discard(100);
+ y.discard(100);
+
+ VERIFY ( !(x != y) );
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox4x32.cc b/libstdc++-v3/testsuite/26_numerics/random/philox4x32.cc
new file mode 100644
index 00000000000..67fd8455f51
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox4x32.cc
@@ -0,0 +1,42 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::philox4x32 a;
+ a.discard(9999);
+
+ VERIFY( a() == 1955073260 );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox4x64.cc b/libstdc++-v3/testsuite/26_numerics/random/philox4x64.cc
new file mode 100644
index 00000000000..60550649104
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox4x64.cc
@@ -0,0 +1,44 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::philox4x64 a;
+ a.discard(9999);
+
+ VERIFY( a() == 3409172418970261260 );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
+
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/119794.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/119794.cc
new file mode 100644
index 00000000000..2ae53ff8b0f
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/119794.cc
@@ -0,0 +1,58 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// Copyright (C) 2025 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+
+#include <random>
+#include <testsuite_hooks.h>
+
+int f(int x)
+{
+ std::seed_seq sq(&x, &x + 1);
+ auto rnd = std::philox4x32(sq);
+ return std::uniform_int_distribution<int>()(rnd);
+}
+
+int g(int x)
+{
+ std::seed_seq sq(&x, &x + 1);
+ auto rnd = std::philox4x32();
+ rnd.seed(sq);
+ return std::uniform_int_distribution<int>()(rnd);
+}
+
+void test01()
+{
+ const int f1 = f(0);
+ const int f2 = f(0);
+
+ const int g1 = g(0);
+ const int g2 = g(0);
+
+ VERIFY( f1 == f2 );
+ VERIFY( g1 == g2 );
+ VERIFY( f1 == g1 ); // this is the bug
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/copy.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/copy.cc
new file mode 100644
index 00000000000..1765f802c4a
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/copy.cc
@@ -0,0 +1,45 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+
+void
+test01()
+{
+
+ std::philox_engine<std::uint_fast32_t, 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53, 0xBB67AE85> e(1ul);
+
+ const auto f(e);
+ auto g(f);
+ g = g; // Suppress unused warning
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/default.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/default.cc
new file mode 100644
index 00000000000..1bdee6e7911
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/default.cc
@@ -0,0 +1,46 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> philox4x32nullkey(0);
+
+ VERIFY( philox4x32nullkey.min() == 0 );
+ VERIFY( philox4x32nullkey.max() == (1ul << 31 | (1ul << 31) - 1) );
+ VERIFY( philox4x32nullkey() == 0x6627e8d5ul );
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed.cc
new file mode 100644
index 00000000000..7e52a308b16
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed.cc
@@ -0,0 +1,39 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <random>
+
+void
+test01()
+{
+ unsigned long seed = 2;
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> philox4x32seeded(seed);
+}
+
+int main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed_seq.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed_seq.cc
new file mode 100644
index 00000000000..9dd1c886e93
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/cons/seed_seq.cc
@@ -0,0 +1,42 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+void
+test01()
+{
+ std::seed_seq sseq{ 1, 2, 3, 4 };
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> philox4x32sseq(sseq);
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/equal.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/equal.cc
new file mode 100644
index 00000000000..caa6f04f737
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/equal.cc
@@ -0,0 +1,50 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> x, y;
+
+ VERIFY ( x == y);
+ x.discard(100);
+ y.discard(100);
+
+ VERIFY (x == y);
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/inequal.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/inequal.cc
new file mode 100644
index 00000000000..081c908a3eb
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/inequal.cc
@@ -0,0 +1,49 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> x, y;
+
+ VERIFY ( !(x != y) );
+ x.discard(100);
+ y.discard(100);
+
+ VERIFY ( !(x != y) );
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/serialize.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/serialize.cc
new file mode 100644
index 00000000000..07c93623d4a
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/serialize.cc
@@ -0,0 +1,69 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <sstream>
+#include <random>
+#include <testsuite_hooks.h>
+#include <iostream>
+
+void
+test01()
+{
+ std::stringstream str;
+ std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> x, y;
+
+ x();
+ str << x;
+
+ VERIFY ( !(x == y) );
+ str >> y;
+ VERIFY ( x == y );
+ for (unsigned long i = 0; i < 100; ++i)
+ {
+ VERIFY (x() == y());
+ }
+ str.clear();
+ str << y();
+ x();
+ x();
+ x();
+ str >> x;
+ /*VERIFY ( x == y );
+ for (unsigned long i = 0; i < 1000; ++i)
+ {
+ VERIFY (x() == y());
+ }*/
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constants.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constants.cc
new file mode 100644
index 00000000000..80579f4cf91
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constants.cc
@@ -0,0 +1,45 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+
+void test01()
+{
+ std::philox4x32 philox;
+ const void* p = &philox.word_size;
+ p = &philox.word_count;
+ p = &philox.round_count;
+ p = &philox.multipliers;
+ p = &philox.round_consts;
+ p = &philox.default_seed;
+ p = p; // Suppress unused warning.
+}
+
+int
+main()
+{
+ test01;
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_data.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_data.cc
new file mode 100644
index 00000000000..0b93b0cd344
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_data.cc
@@ -0,0 +1,69 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_common_types.h>
+
+namespace __gnu_test
+{
+ struct constexpr_member_data
+ {
+ template<typename _Ttesttype>
+ void
+ operator()()
+ {
+ struct _Concept
+ {
+ void __constraint()
+ {
+ constexpr auto v1 __attribute__((unused))
+ = _Ttesttype::word_size;
+ constexpr auto v2 __attribute__((unused))
+ = _Ttesttype::word_count;
+ constexpr auto v3 __attribute__((unused))
+ = _Ttesttype::round_count;
+ constexpr auto v4 __attribute__((unused))
+ = _Ttesttype::multipliers;
+ constexpr auto v5 __attribute__((unused))
+ = _Ttesttype::round_consts;
+ constexpr auto v6 __attribute__((unused))
+ = _Ttesttype::default_seed;
+ }
+ };
+
+ _Concept c;
+ c.__constraint();
+ }
+ };
+};
+
+int
+main()
+{
+ __gnu_test::constexpr_member_data test;
+ typedef std::philox4x32 type;
+ test.operator()<type>();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_functions.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_functions.cc
new file mode 100644
index 00000000000..c3a4ecc5e0e
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/constexpr_functions.cc
@@ -0,0 +1,61 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+#include <random>
+#include <testsuite_common_types.h>
+
+namespace __gnu_test
+{
+ struct constexpr_member_functions
+ {
+ template<typename _Ttesttype>
+ void
+ operator()()
+ {
+ struct _Concept
+ {
+ void __constraint()
+ {
+ constexpr auto v1 __attribute__((unused))
+ = _Ttesttype::min();
+ constexpr auto v2 __attribute__((unused))
+ = _Ttesttype::max();
+ }
+ };
+ _Concept c;
+ c.__constraint();
+ }
+ };
+}
+
+int
+main()
+{
+ __gnu_test::constexpr_member_functions test;
+ typedef std::philox4x32 type;
+ test.operator()<type>();
+ return 0;
+}
+
diff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/typedefs.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/typedefs.cc
new file mode 100644
index 00000000000..e037ad2db1a
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/requirements/typedefs.cc
@@ -0,0 +1,45 @@
+// { dg-do run { target c++26 } }
+// { dg-require-cstdint "" }
+//
+// 2025-04-09 1nfocalypse <1nfocaly...@protonmail.com>
+//
+// Copyright (C) 2025-2034 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3. If not see
+// https://www.gnu.org/licenses>
+
+// 29.5.4 Random Number Engine Class Templates
+// 29.5.4.5 Class Template philox_engine
+
+
+#include <random>
+
+void
+test01()
+{
+ typedef std::philox_engine<std::uint_fast32_t,
+ 32, 4, 10, 0xCD9E8D57,
+ 0x9E3779B9, 0xD2511F53,
+ 0xBB67AE85> testType;
+
+ typedef testType::result_type result_type;
+}
+
+int
+main()
+{
+ test01();
+ return 0;
+}
diff --git a/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc b/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc
index 0afba654152..5bb3f31eddc 100644
--- a/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc
+++ b/libstdc++-v3/testsuite/26_numerics/random/pr60037-neg.cc
@@ -12,4 +12,4 @@ auto x = std::generate_canonical<std::size_t,
// { dg-error "static assertion failed: template argument must be a floating point type" "" { target *-*-* } 270 }
-// { dg-error "static assertion failed: template argument must be a floating point type" "" { target *-*-* } 3357 }
+// { dg-error "static assertion failed: template argument must be a floating point type" "" { target *-*-* } 3558 }
--
2.49.0
