[X86][AVX512] change broadcast to use maskable pattern

[oota-llvm.git] / lib / Support / RandomNumberGenerator.cpp

diff --git a/lib/Support/RandomNumberGenerator.cpp b/lib/Support/RandomNumberGenerator.cpp
index 5513982e7b13b9904ec1a15d5041370184776eda..81d0411d60b465920322cf4b515a0f8f488eb00a 100644 (file)
--- a/lib/Support/RandomNumberGenerator.cpp
+++ b/lib/Support/RandomNumberGenerator.cpp
@@ -7,19 +7,21 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements random number generation (RNG).
+// This file implements deterministic random number generation (RNG).
 // The current implementation is NOT cryptographically secure as it uses
 // the C++11 <random> facilities.
 //
 //===----------------------------------------------------------------------===//
 
-#define DEBUG_TYPE "rng"
 #include "llvm/Support/RandomNumberGenerator.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
+#define DEBUG_TYPE "rng"
+
 // Tracking BUG: 19665
 // http://llvm.org/bugs/show_bug.cgi?id=19665
 //
@@ -31,22 +33,25 @@ Seed("rng-seed", cl::value_desc("seed"),
 RandomNumberGenerator::RandomNumberGenerator(StringRef Salt) {
   DEBUG(
     if (Seed == 0)
-      errs() << "Warning! Using unseeded random number generator.\n"
+      dbgs() << "Warning! Using unseeded random number generator.\n"
   );
 
-  // Combine seed and salt using std::seed_seq.
-  // Entropy: Seed-low, Seed-high, Salt...
-  size_t Size = Salt.size() + 2;
-  uint32_t Data[Size];
-  Data[0] = Seed;
-  Data[1] = Seed >> 32;
-  std::copy_n(Salt.begin(), Salt.size(), Data + 2);
+  // Combine seed and salts using std::seed_seq.
+  // Data: Seed-low, Seed-high, Salt
+  // Note: std::seed_seq can only store 32-bit values, even though we
+  // are using a 64-bit RNG. This isn't a problem since the Mersenne
+  // twister constructor copies these correctly into its initial state.
+  std::vector<uint32_t> Data;
+  Data.reserve(2 + Salt.size());
+  Data.push_back(Seed);
+  Data.push_back(Seed >> 32);
+
+  std::copy(Salt.begin(), Salt.end(), Data.end());
 
-  std::seed_seq SeedSeq(Data, Data + Size);
+  std::seed_seq SeedSeq(Data.begin(), Data.end());
   Generator.seed(SeedSeq);
 }
 
-uint64_t RandomNumberGenerator::next(uint64_t Max) {
-  std::uniform_int_distribution<uint64_t> distribution(0, Max - 1);
-  return distribution(Generator);
+uint_fast64_t RandomNumberGenerator::operator()() {
+  return Generator();
 }