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//===-- RNG.cpp -------------------------------------------------*- C++ -*-===//
//
// The KLEE Symbolic Virtual Machine
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "klee/ADT/RNG.h"
#include "klee/Support/OptionCategories.h"
using namespace klee;
namespace {
llvm::cl::opt<RNG::result_type> RNGInitialSeed(
"rng-initial-seed", llvm::cl::init(5489U),
llvm::cl::desc("seed value for random number generator (default=5489)"),
llvm::cl::cat(klee::MiscCat));
}
RNG::RNG() : std::mt19937(RNGInitialSeed.getValue()) { }
RNG::RNG(RNG::result_type seed) : std::mt19937(seed) {}
/* generates a random number on [0,0xffffffff]-interval */
unsigned int RNG::getInt32() {
static_assert((min)() == 0);
static_assert((max)() == -1u);
return (*this)();
}
/* generates a random number on [0,1)-real-interval */
double RNG::getDoubleL() {
return getInt32()*(1.0/4294967296.0);
/* divided by 2^32 */
}
/* generates a random number on (0,1)-real-interval */
double RNG::getDouble() {
return (((double)getInt32()) + 0.5)*(1.0/4294967296.0);
/* divided by 2^32 */
}
bool RNG::getBool() {
unsigned bits = getInt32();
bits ^= bits >> 16U;
bits ^= bits >> 8U;
bits ^= bits >> 4U;
bits ^= bits >> 2U;
bits ^= bits >> 1U;
return bits & 1U;
}
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