[libFuzzer] fix UB and simplify the computation of the RNG seed (https://llvm.org...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290622 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Fuzzer/FuzzerDriver.cpp b/lib/Fuzzer/FuzzerDriver.cpp
index 95b0721..f45ed04 100644 (file)
--- a/lib/Fuzzer/FuzzerDriver.cpp
+++ b/lib/Fuzzer/FuzzerDriver.cpp
@@ -442,8 +442,8 @@ int FuzzerDriver(int *argc, char ***argv, UserCallback Callback) {
   unsigned Seed = Flags.seed;
   // Initialize Seed.
   if (Seed == 0)
-    Seed = (std::chrono::system_clock::now().time_since_epoch().count() << 10) +
-           GetPid();
+    Seed =
+        std::chrono::system_clock::now().time_since_epoch().count() + GetPid();
   if (Flags.verbosity)
     Printf("INFO: Seed: %u\n", Seed);