[compiler-rt] r352732 - [libFuzzer] replace slow std::mt19937 with a much faster std::minstd_rand

[Kostya Serebryany via llvm-commits]

Author: kcc
Date: Wed Jan 30 22:52:55 2019
New Revision: 352732

URL: http://llvm.org/viewvc/llvm-project?rev=352732&view=rev
Log:
[libFuzzer] replace slow std::mt19937 with a much faster std::minstd_rand

Modified:
    compiler-rt/trunk/lib/fuzzer/FuzzerRandom.h

Modified: compiler-rt/trunk/lib/fuzzer/FuzzerRandom.h
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/fuzzer/FuzzerRandom.h?rev=352732&r1=352731&r2=352732&view=diff
==============================================================================
--- compiler-rt/trunk/lib/fuzzer/FuzzerRandom.h (original)
+++ compiler-rt/trunk/lib/fuzzer/FuzzerRandom.h Wed Jan 30 22:52:55 2019
@@ -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; }