Fix FastISel to recognize unhandled operands, such as constants
that aren't available as virtual registers (for now).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55026 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/FastISel.cpp b/lib/CodeGen/SelectionDAG/FastISel.cpp
index 996cea0..e56747a 100644
--- a/lib/CodeGen/SelectionDAG/FastISel.cpp
+++ b/lib/CodeGen/SelectionDAG/FastISel.cpp
@@ -25,6 +25,10 @@
DenseMap<const Value*, unsigned> &ValueMap) {
unsigned Op0 = ValueMap[I->getOperand(0)];
unsigned Op1 = ValueMap[I->getOperand(1)];
+ if (Op0 == 0 || Op1 == 0)
+ // Unhandled operand. Halt "fast" selection and bail.
+ return false;
+
MVT VT = MVT::getMVT(I->getType(), /*HandleUnknown=*/true);
if (VT == MVT::Other || !VT.isSimple())
// Unhandled type. Halt "fast" selection and bail.