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Merge pull request #2793 from verilog-to-routing/temp_rand_remove_static
Random number generation classes
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,91 +1,67 @@ | ||
| #include <cstddef> | ||
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| #include "vtr_random.h" | ||
| #include "specrand.h" | ||
| #include "vtr_util.h" | ||
| #include "vtr_error.h" | ||
| #include "specrand.h" | ||
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| #define CHECK_RAND | ||
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| namespace vtr { | ||
| /* Portable random number generator defined below. Taken from ANSI C by * | ||
| * K & R. Not a great generator, but fast, and good enough for my needs. */ | ||
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| constexpr size_t IA = 1103515245u; | ||
| constexpr size_t IC = 12345u; | ||
| constexpr size_t IM = 2147483648u; | ||
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| static RandState random_state = 0; | ||
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| /** | ||
| * @brief The pseudo-random number generator is initialized using the argument passed as seed. | ||
| */ | ||
| void srandom(int seed) { | ||
| random_state = (unsigned int)seed; | ||
| #ifdef SPEC_CPU | ||
| /* SPEC CPU requires a different random number generator */ | ||
| spec_init_genrand((unsigned long)seed); | ||
| #endif | ||
| RandomNumberGenerator::RandomNumberGenerator(int seed) { | ||
| random_state_ = (unsigned int)seed; | ||
| } | ||
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| /* returns the random_state value */ | ||
| RandState get_random_state() { | ||
| return random_state; | ||
| RandomNumberGenerator::RandomNumberGenerator() | ||
| : RandomNumberGenerator(0) {} | ||
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| void RandomNumberGenerator::srandom(int seed) { | ||
| random_state_ = (unsigned int)seed; | ||
| } | ||
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| int irand(int imax, RandState& state) { | ||
| #ifdef SPEC_CPU | ||
| /* SPEC CPU requires a different random number generator */ | ||
| return (int)(spec_genrand_int31() % (imax + 1)); | ||
| #else | ||
| /* Creates a random integer between 0 and imax, inclusive. i.e. [0..imax] */ | ||
| int RandomNumberGenerator::irand(int imax) { | ||
| // Creates a random integer between 0 and imax, inclusive. i.e. [0..imax] | ||
| int ival; | ||
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| /* state = (state * IA + IC) % IM; */ | ||
| state = state * IA + IC; /* Use overflow to wrap */ | ||
| ival = state & (IM - 1); /* Modulus */ | ||
| // state = (state * IA + IC) % IM; | ||
| random_state_ = random_state_ * IA + IC; // Use overflow to wrap | ||
| ival = random_state_ & (IM - 1); // Modulus | ||
| ival = (int)((float)ival * (float)(imax + 0.999) / (float)IM); | ||
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| # ifdef CHECK_RAND | ||
| if ((ival < 0) || (ival > imax)) { | ||
| if (ival == imax + 1) { | ||
| /* Due to random floating point rounding, sometimes above calculation gives number greater than ival by 1 */ | ||
| ival = imax; | ||
| } else { | ||
| throw VtrError(string_fmt("Bad value in my_irand, imax = %d ival = %d", imax, ival), __FILE__, __LINE__); | ||
| if constexpr (CHECK_RAND_CONSTEXPR) { | ||
| if ((ival < 0) || (ival > imax)) { | ||
| if (ival == imax + 1) { | ||
| // Due to random floating point rounding, sometimes above calculation gives number greater than ival by 1 | ||
| ival = imax; | ||
| } else { | ||
| throw VtrError(string_fmt("Bad value in my_irand, imax = %d ival = %d", imax, ival), __FILE__, __LINE__); | ||
| } | ||
| } | ||
| } | ||
| # endif | ||
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| return ival; | ||
| #endif | ||
| } | ||
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| int irand(int imax) { | ||
| return irand(imax, random_state); | ||
| } | ||
| float RandomNumberGenerator::frand() { | ||
| random_state_ = random_state_ * IA + IC; /* Use overflow to wrap */ | ||
| int ival = random_state_ & (IM - 1); /* Modulus */ | ||
| float fval = (float)ival / (float)IM; | ||
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| float frand() { | ||
| /* Creates a random float between 0 and 1. i.e. [0..1). */ | ||
| #ifdef SPEC_CPU | ||
| /* SPEC CPU requires a different random number generator */ | ||
| return (float)spec_genrand_real2(); | ||
| #else | ||
| float fval; | ||
| int ival; | ||
| if constexpr (CHECK_RAND_CONSTEXPR) { | ||
| if (fval < 0 || fval > 1.) { | ||
| throw VtrError(string_fmt("Bad value in my_frand, fval = %g", fval), __FILE__, __LINE__); | ||
| } | ||
| } | ||
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| random_state = random_state * IA + IC; /* Use overflow to wrap */ | ||
| ival = random_state & (IM - 1); /* Modulus */ | ||
| fval = (float)ival / (float)IM; | ||
| return fval; | ||
| } | ||
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| # ifdef CHECK_RAND | ||
| if ((fval < 0) || (fval > 1.)) { | ||
| throw VtrError(string_fmt("Bad value in my_frand, fval = %g", fval), __FILE__, __LINE__); | ||
| RngContainer::RngContainer(int seed) { | ||
| if constexpr (SPEC_CPU_CONSTEXPR) { | ||
| rng_ = std::make_unique<SpecRandomNumberGenerator>(seed); | ||
| } else { | ||
| rng_ = std::make_unique<vtr::RandomNumberGenerator>(seed); | ||
| } | ||
| # endif | ||
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| return (fval); | ||
| #endif | ||
| } | ||
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| RngContainer::RngContainer() | ||
| : RngContainer(0) {} | ||
| } // namespace vtr |
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