[libFuzzer] replace slow std::mt19937 with a much faster std::minstd_rand
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@352732 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/FuzzerRandom.h b/FuzzerRandom.h
index f475797..4dde7d8 100644
--- a/FuzzerRandom.h
+++ b/FuzzerRandom.h
@@ -14,10 +14,10 @@
#include <random>
namespace fuzzer {
-class Random : public std::mt19937 {
+class Random : public std::minstd_rand {
public:
- Random(unsigned int seed) : std::mt19937(seed) {}
- result_type operator()() { return this->std::mt19937::operator()(); }
+ Random(unsigned int seed) : std::minstd_rand(seed) {}
+ result_type operator()() { return this->std::minstd_rand::operator()(); }
size_t Rand() { return this->operator()(); }
size_t RandBool() { return Rand() % 2; }
size_t operator()(size_t n) { return n ? Rand() % n : 0; }