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

Reported by Yang Yongyong, thanks! llvm-svn: 171101
2012-12-26 06:43:14 +00:00 · 2012-12-26 06:43:14 +00:00 · bf99a426cb
parent 794a73124b
commit bf99a426cb
1 changed files with 1 additions and 1 deletions
--- a/llvm/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/llvm/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";
 }