commit 4a90d5fbbb6802c59093b866f3478a814bf02b95
author Ben Murdoch <benm@google.com> Tue Mar 22 12:00:34 2016 +0000
committer Dirk Vogt <dirk@fairphone.com> Fri Mar 17 16:05:42 2017 +0100
tree 486867e3a04e7f17454c94a4c97891bb0e237f1f
parent 3821a70061b1b2077ee51c70eda717bddac94f58

Upgrade V8 to version 4.9.385.28

https://chromium.googlesource.com/v8/v8/+/4.9.385.28

FPIIM-449

Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4

src/base/utils/random-number-generator.cc

diff --git a/src/base/utils/random-number-generator.cc b/src/base/utils/random-number-generator.cc
index 29a48ff..ff42840 100644
--- a/src/base/utils/random-number-generator.cc
+++ b/src/base/utils/random-number-generator.cc
@@ -97,15 +97,14 @@
 
 
 double RandomNumberGenerator::NextDouble() {
-  return ((static_cast<int64_t>(Next(26)) << 27) + Next(27)) /
-      static_cast<double>(static_cast<int64_t>(1) << 53);
+  XorShift128(&state0_, &state1_);
+  return ToDouble(state0_, state1_);
 }
 
 
 int64_t RandomNumberGenerator::NextInt64() {
-  uint64_t lo = bit_cast<unsigned>(Next(32));
-  uint64_t hi = bit_cast<unsigned>(Next(32));
-  return lo | (hi << 32);
+  XorShift128(&state0_, &state1_);
+  return bit_cast<int64_t>(state0_ + state1_);
 }
 
 
@@ -119,21 +118,27 @@
 int RandomNumberGenerator::Next(int bits) {
   DCHECK_LT(0, bits);
   DCHECK_GE(32, bits);
-  // Do unsigned multiplication, which has the intended modulo semantics, while
-  // signed multiplication would expose undefined behavior.
-  uint64_t product = static_cast<uint64_t>(seed_) * kMultiplier;
-  // Assigning a uint64_t to an int64_t is implementation defined, but this
-  // should be OK. Use a static_cast to explicitly state that we know what we're
-  // doing. (Famous last words...)
-  int64_t seed = static_cast<int64_t>((product + kAddend) & kMask);
-  seed_ = seed;
-  return static_cast<int>(seed >> (48 - bits));
+  XorShift128(&state0_, &state1_);
+  return static_cast<int>((state0_ + state1_) >> (64 - bits));
 }
 
 
 void RandomNumberGenerator::SetSeed(int64_t seed) {
+  if (seed == 0) seed = 1;
   initial_seed_ = seed;
-  seed_ = (seed ^ kMultiplier) & kMask;
+  state0_ = MurmurHash3(bit_cast<uint64_t>(seed));
+  state1_ = MurmurHash3(state0_);
 }
 
-} }  // namespace v8::base
+
+uint64_t RandomNumberGenerator::MurmurHash3(uint64_t h) {
+  h ^= h >> 33;
+  h *= V8_UINT64_C(0xFF51AFD7ED558CCD);
+  h ^= h >> 33;
+  h *= V8_UINT64_C(0xC4CEB9FE1A85EC53);
+  h ^= h >> 33;
+  return h;
+}
+
+}  // namespace base
+}  // namespace v8