diff --git a/clang/utils/TableGen/RISCVVEmitter.cpp b/clang/utils/TableGen/RISCVVEmitter.cpp
--- a/clang/utils/TableGen/RISCVVEmitter.cpp
+++ b/clang/utils/TableGen/RISCVVEmitter.cpp
@@ -58,7 +58,7 @@
   SmallVector<PrototypeDescriptor> OverloadedSuffix;
 
   // BitMask for supported policies.
-  uint16_t PolicyBitMask;
+  uint16_t PolicyBitMask = 0;
 
   // Number of field, large than 1 if it's segment load/store.
   unsigned NF;