Fix shift overflow bug that would occur when a field was a full 32-bits
in tblgen. This is PR2827, thanks to Waldemar Knorr for tracking this
down.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57124 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/CodeEmitterGen.cpp b/utils/TableGen/CodeEmitterGen.cpp
index 62df686..ae4a6aa 100644
--- a/utils/TableGen/CodeEmitterGen.cpp
+++ b/utils/TableGen/CodeEmitterGen.cpp
@@ -191,7 +191,7 @@
gotOp = true;
}
- unsigned opMask = (1 << N) - 1;
+ unsigned opMask = ~0U >> (32-N);
int opShift = beginVarBit - N + 1;
opMask <<= opShift;
opShift = beginInstBit - beginVarBit;