From 1a9ca774b687ebae352d8795e5a3603605408580 Mon Sep 17 00:00:00 2001
From: Justin Bogner <mail@justinbogner.com>
Date: Thu, 14 May 2015 06:47:02 +0000
Subject: TableGen: Avoid undefined behaviour by doing this shift in int64

Found by ubsan. This was taking a bool and left shifting by 32 - the
result is 64 bit, so we should really do the math in a type it fits
in.

llvm-svn: 237345
---
 llvm/lib/TableGen/Record.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'llvm/lib')

diff --git a/llvm/lib/TableGen/Record.cpp b/llvm/lib/TableGen/Record.cpp
index 7229b8c30a3..1b5a902dea6 100644
--- a/llvm/lib/TableGen/Record.cpp
+++ b/llvm/lib/TableGen/Record.cpp
@@ -230,7 +230,7 @@ Init *IntRecTy::convertValue(BitsInit *BI) {
   int64_t Result = 0;
   for (unsigned i = 0, e = BI->getNumBits(); i != e; ++i)
     if (BitInit *Bit = dyn_cast<BitInit>(BI->getBit(i)))
-      Result |= Bit->getValue() << i;
+      Result |= static_cast<int64_t>(Bit->getValue()) << i;
     else
       return nullptr;
   return IntInit::get(Result);
-- 
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