commit fc093def2d892a2ea068d3b9e6d5839c187cc942
author NAKAMURA Takumi <geek4civic@gmail.com> Wed Dec 26 06:43:14 2012 +0000
committer NAKAMURA Takumi <geek4civic@gmail.com> Wed Dec 26 06:43:14 2012 +0000
tree a275e5687c740da434cb8898015bbaf1c6393563
parent 00ba3014d8f6694b03997022259e5b266e5e112a

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

utils/TableGen/FixedLenDecoderEmitter.cpp

diff --git a/utils/TableGen/FixedLenDecoderEmitter.cpp b/utils/TableGen/FixedLenDecoderEmitter.cpp
index b2dc878..0c3017f 100644
--- a/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/utils/TableGen/FixedLenDecoderEmitter.cpp
@@ -1866,7 +1866,7 @@
      << "    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";
 }