Index: compiler-rt/lib/fuzzer/FuzzerUtil.h
===================================================================
--- compiler-rt/lib/fuzzer/FuzzerUtil.h
+++ compiler-rt/lib/fuzzer/FuzzerUtil.h
@@ -88,7 +88,8 @@
 
 std::string SearchRegexCmd(const std::string &Regex);
 
-size_t SimpleFastHash(const uint8_t *Data, size_t Size);
+size_t SimpleFastHash(const void *Data, size_t Size);
+void SimpleFastHash64(const void *Data, size_t Size, uint64_t *Hash);
 
 inline uint32_t Log(uint32_t X) { return 32 - Clz(X) - 1; }
 
Index: compiler-rt/lib/fuzzer/FuzzerUtil.cpp
===================================================================
--- compiler-rt/lib/fuzzer/FuzzerUtil.cpp
+++ compiler-rt/lib/fuzzer/FuzzerUtil.cpp
@@ -226,11 +226,21 @@
   return N;
 }
 
-size_t SimpleFastHash(const uint8_t *Data, size_t Size) {
-  size_t Res = 0;
+template <typename T>
+static T SimpleFastHashImpl(const void *Data, size_t Size, T Initial) {
+  T Result = Initial;
+  const uint8_t *Bytes = static_cast<const uint8_t *>(Data);
   for (size_t i = 0; i < Size; i++)
-    Res = Res * 11 + Data[i];
-  return Res;
+    Result = Result * 11 + Bytes[i];
+  return Result;
+}
+
+size_t SimpleFastHash(const void *Data, size_t Size) {
+  return SimpleFastHashImpl<size_t>(Data, Size, 0);
+}
+
+void SimpleFastHash64(const void *Data, size_t Size, uint64_t *Hash) {
+  *Hash = SimpleFastHashImpl<uint64_t>(Data, Size, *Hash);
 }
 
 }  // namespace fuzzer