1 files changed, 6 insertions, 0 deletions
diff --git a/libsanitizer/tsan/tsan_defs.h b/libsanitizer/tsan/tsan_defs.h
index c14a6d19623..6683a4e1abb 100644
--- a/libsanitizer/tsan/tsan_defs.h
+++ b/libsanitizer/tsan/tsan_defs.h
@@ -137,6 +137,12 @@ T RoundDown(T p, u64 align) {
   return (T)((u64)p & ~(align - 1));
 }
 
+// Zeroizes high part, returns 'bits' lsb bits.
+template<typename T>
+T GetLsb(T v, int bits) {
+  return (T)((u64)v & ((1ull << bits) - 1));
+}
+
 struct MD5Hash {
   u64 hash[2];
   bool operator==(const MD5Hash &other) const;