From: NAKAMURA Takumi <geek4civic@gmail.com>
Date: Wed, 26 Dec 2012 06:43:14 +0000 (+0000)
Subject: TableGen/FixedLenDecoderEmitter.cpp: Fix a potential mask overflow in fieldFromInstru... 
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=fc093def2d892a2ea068d3b9e6d5839c187cc942;p=oota-llvm.git

TableGen/FixedLenDecoderEmitter.cpp: Fix a potential mask overflow in fieldFromInstruction().

Reported by Yang Yongyong, thanks!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171101 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/utils/TableGen/FixedLenDecoderEmitter.cpp b/utils/TableGen/FixedLenDecoderEmitter.cpp
index b2dc8788809..0c3017f3892 100644
--- a/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/utils/TableGen/FixedLenDecoderEmitter.cpp
@@ -1866,7 +1866,7 @@ static void emitFieldFromInstruction(formatted_raw_ostream &OS) {
      << "    if (numBits == sizeof(InsnType)*8)\n"
      << "      fieldMask = (InsnType)(-1LL);\n"
      << "    else\n"
-     << "      fieldMask = ((1 << numBits) - 1) << startBit;\n"
+     << "      fieldMask = (((InsnType)1 << numBits) - 1) << startBit;\n"
      << "    return (insn & fieldMask) >> startBit;\n"
      << "}\n\n";
 }