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b56f4176cb
* Denested src folder to root, renamed testing to asmjit-testing
* Refactored how headers are included into <asmjit/...> form. This
is necessary as compilers would never simplify a path once a ..
appears in include directory - then paths such as ../core/../core
appeared in asserts, which was ugly
* Moved support utilities into asmjit/support/... (still included
by asmjit/core.h for convenience and compatibility)
* Added CMakePresets.json for making it easy to develop AsmJit
* Reworked CMakeLists to be shorter and use CMake option(),
etc... This simplifies it and makes it using more standard
features
* ASMJIT_EMBED now creates asmjit_embed INTERFACE library,
which is accessible via asmjit::asmjit target - this simplifies
embedding and makes it the same as library targets from a CMake
perspective
* Removed ASMJIT_DEPS - this is now provided by cmake target
aliases - 'asmjit::asmjit' so users should not need this variable
* Changed meaning of ASMJIT_LIBS - this now contains only AsmJit
dependencies without asmjit::asmjit target alias. Don't rely on
ASMJIT_LIBS anymore as it's only used internally
* Removed ASMJIT_NO_DEPRECATED option - AsmJit is not going
to provide controllable deprecations in the future
* Removed ASMJIT_NO_VALIDATION in favor of ASMJIT_NO_INTROSPECTION,
which now controls query, features, and validation API presence
* Removed ASMJIT_DIR option - it was never really needed
* Removed AMX_TRANSPOSE feature from instruction database (X86).
Intel has removed it as well, so it's a feature that won't
be siliconized
78 lines
2.0 KiB
C++
78 lines
2.0 KiB
C++
// This file is part of AsmJit project <https://asmjit.com>
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//
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// See <asmjit/core.h> or LICENSE.md for license and copyright information
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// SPDX-License-Identifier: Zlib
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#ifndef TESTING_COMMONS_RANDOM_H_INCLUDED
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#define TESTING_COMMONS_RANDOM_H_INCLUDED
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#include <stdint.h>
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#include <string.h>
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namespace TestUtils {
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namespace {
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// A pseudo random number generator based on a paper by Sebastiano Vigna:
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// http://vigna.di.unimi.it/ftp/papers/xorshiftplus.pdf
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class Random {
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public:
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// Constants suggested as `23/18/5`.
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static inline constexpr uint32_t kStep1_SHL = 23;
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static inline constexpr uint32_t kStep2_SHR = 18;
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static inline constexpr uint32_t kStep3_SHR = 5;
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uint64_t _state[2];
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inline explicit Random(uint64_t seed = 0) noexcept { reset(seed); }
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inline Random(const Random& other) noexcept = default;
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inline void reset(uint64_t seed = 0) noexcept {
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// The number is arbitrary, it means nothing.
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constexpr uint64_t kZeroSeed = 0x1F0A2BE71D163FA0u;
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// Generate the state data by using splitmix64.
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for (uint32_t i = 0; i < 2; i++) {
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seed += 0x9E3779B97F4A7C15u;
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uint64_t x = seed;
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x = (x ^ (x >> 30)) * 0xBF58476D1CE4E5B9u;
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x = (x ^ (x >> 27)) * 0x94D049BB133111EBu;
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x = (x ^ (x >> 31));
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_state[i] = x != 0 ? x : kZeroSeed;
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}
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}
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inline uint32_t next_uint32() noexcept {
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return uint32_t(next_uint64() >> 32);
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}
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inline uint64_t next_uint64() noexcept {
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uint64_t x = _state[0];
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uint64_t y = _state[1];
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x ^= x << kStep1_SHL;
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y ^= y >> kStep3_SHR;
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x ^= x >> kStep2_SHR;
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x ^= y;
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_state[0] = y;
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_state[1] = x;
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return x + y;
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}
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inline double next_double() noexcept {
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constexpr uint32_t kMantissaShift = 64 - 52;
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constexpr uint64_t kExpMsk = 0x3FF0000000000000u;
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uint64_t u = (next_uint64() >> kMantissaShift) | kExpMsk;
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double d = 0.0;
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memcpy(&d, &u, 8);
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return d - 1.0;
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}
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};
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} // {anonymous}
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} // {TestUtils}
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#endif // TESTING_COMMONS_RANDOM_H_INCLUDED
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