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| 1 //===- subzero/src/IceRNG.h - Random number generator -----------*- C++ -*-===// | 1 //===- subzero/src/IceRNG.h - Random number generator -----------*- C++ -*-===// |
| 2 // | 2 // |
| 3 // The Subzero Code Generator | 3 // The Subzero Code Generator |
| 4 // | 4 // |
| 5 // This file is distributed under the University of Illinois Open Source | 5 // This file is distributed under the University of Illinois Open Source |
| 6 // License. See LICENSE.TXT for details. | 6 // License. See LICENSE.TXT for details. |
| 7 // | 7 // |
| 8 //===----------------------------------------------------------------------===// | 8 //===----------------------------------------------------------------------===// |
| 9 // | 9 /// |
| 10 // This file declares a random number generator. | 10 /// \file |
| 11 // | 11 /// This file declares a random number generator. |
| 12 /// |
| 12 //===----------------------------------------------------------------------===// | 13 //===----------------------------------------------------------------------===// |
| 13 | 14 |
| 14 #ifndef SUBZERO_SRC_ICERNG_H | 15 #ifndef SUBZERO_SRC_ICERNG_H |
| 15 #define SUBZERO_SRC_ICERNG_H | 16 #define SUBZERO_SRC_ICERNG_H |
| 16 | 17 |
| 17 #include "llvm/ADT/StringRef.h" | 18 #include "llvm/ADT/StringRef.h" |
| 18 #include "llvm/Support/Compiler.h" | 19 #include "llvm/Support/Compiler.h" |
| 19 #include <cstdint> | 20 #include <cstdint> |
| 20 | 21 |
| 21 namespace Ice { | 22 namespace Ice { |
| 22 | 23 |
| 23 class RandomNumberGenerator { | 24 class RandomNumberGenerator { |
| 24 RandomNumberGenerator() = delete; | 25 RandomNumberGenerator() = delete; |
| 25 RandomNumberGenerator(const RandomNumberGenerator &) = delete; | 26 RandomNumberGenerator(const RandomNumberGenerator &) = delete; |
| 26 RandomNumberGenerator &operator=(const RandomNumberGenerator &) = delete; | 27 RandomNumberGenerator &operator=(const RandomNumberGenerator &) = delete; |
| 27 | 28 |
| 28 public: | 29 public: |
| 29 explicit RandomNumberGenerator(uint64_t Seed, llvm::StringRef Salt = ""); | 30 explicit RandomNumberGenerator(uint64_t Seed, llvm::StringRef Salt = ""); |
| 30 uint64_t next(uint64_t Max); | 31 uint64_t next(uint64_t Max); |
| 31 | 32 |
| 32 private: | 33 private: |
| 33 uint64_t State; | 34 uint64_t State; |
| 34 }; | 35 }; |
| 35 | 36 |
| 36 // This class adds additional random number generator utilities. The | 37 /// This class adds additional random number generator utilities. The |
| 37 // reason for the wrapper class is that we want to keep the | 38 /// reason for the wrapper class is that we want to keep the |
| 38 // RandomNumberGenerator interface identical to LLVM's. | 39 /// RandomNumberGenerator interface identical to LLVM's. |
| 39 class RandomNumberGeneratorWrapper { | 40 class RandomNumberGeneratorWrapper { |
| 40 RandomNumberGeneratorWrapper() = delete; | 41 RandomNumberGeneratorWrapper() = delete; |
| 41 RandomNumberGeneratorWrapper(const RandomNumberGeneratorWrapper &) = delete; | 42 RandomNumberGeneratorWrapper(const RandomNumberGeneratorWrapper &) = delete; |
| 42 RandomNumberGeneratorWrapper & | 43 RandomNumberGeneratorWrapper & |
| 43 operator=(const RandomNumberGeneratorWrapper &) = delete; | 44 operator=(const RandomNumberGeneratorWrapper &) = delete; |
| 44 | 45 |
| 45 public: | 46 public: |
| 46 uint64_t operator()(uint64_t Max) { return RNG.next(Max); } | 47 uint64_t operator()(uint64_t Max) { return RNG.next(Max); } |
| 47 bool getTrueWithProbability(float Probability); | 48 bool getTrueWithProbability(float Probability); |
| 48 explicit RandomNumberGeneratorWrapper(RandomNumberGenerator &RNG) | 49 explicit RandomNumberGeneratorWrapper(RandomNumberGenerator &RNG) |
| 49 : RNG(RNG) {} | 50 : RNG(RNG) {} |
| 50 | 51 |
| 51 private: | 52 private: |
| 52 RandomNumberGenerator &RNG; | 53 RandomNumberGenerator &RNG; |
| 53 }; | 54 }; |
| 54 | 55 |
| 55 // RandomShuffle is an implementation of std::random_shuffle() that | 56 /// RandomShuffle is an implementation of std::random_shuffle() that |
| 56 // doesn't change across stdlib implementations. Adapted from a | 57 /// doesn't change across stdlib implementations. Adapted from a |
| 57 // sample implementation at cppreference.com. | 58 /// sample implementation at cppreference.com. |
| 58 template <class RandomIt, class RandomFunc> | 59 template <class RandomIt, class RandomFunc> |
| 59 void RandomShuffle(RandomIt First, RandomIt Last, RandomFunc &&RNG) { | 60 void RandomShuffle(RandomIt First, RandomIt Last, RandomFunc &&RNG) { |
| 60 for (auto i = Last - First - 1; i > 0; --i) | 61 for (auto i = Last - First - 1; i > 0; --i) |
| 61 std::swap(First[i], First[RNG(i + 1)]); | 62 std::swap(First[i], First[RNG(i + 1)]); |
| 62 } | 63 } |
| 63 | 64 |
| 64 } // end of namespace Ice | 65 } // end of namespace Ice |
| 65 | 66 |
| 66 #endif // SUBZERO_SRC_ICERNG_H | 67 #endif // SUBZERO_SRC_ICERNG_H |
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