1 files changed, 1 insertions, 1 deletions
diff --git a/lib/Support/ScaledNumber.cpp b/lib/Support/ScaledNumber.cpp
index fc6d4e7..6f6699c 100644
--- a/lib/Support/ScaledNumber.cpp
+++ b/lib/Support/ScaledNumber.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/ScaledNumber.h"
-
 #include "llvm/ADT/APFloat.h"
 #include "llvm/Support/Debug.h"
 
@@ -169,6 +168,7 @@ static std::string toStringAPFloat(uint64_t D, int E, unsigned Precision) {
   int Shift = 63 - (NewE - E);
   assert(Shift <= LeadingZeros);
   assert(Shift == LeadingZeros || NewE == ScaledNumbers::MaxScale);
+  assert(Shift >= 0 && Shift < 64 && "undefined behavior");
   D <<= Shift;
   E = NewE;