diff options
Diffstat (limited to 'lib/CodeGen/SelectionDAG/LegalizeDAG.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/LegalizeDAG.cpp | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp index 5f8a21aca0..52449ef376 100644 --- a/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp +++ b/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp @@ -219,6 +219,23 @@ SDOperand SelectionDAGLegalize::LegalizeOp(SDOperand Op) { if (Tmp1 != Node->getOperand(0)) Result = DAG.getImplicitDef(Tmp1, cast<RegSDNode>(Node)->getReg()); break; + case ISD::UNDEF: { + MVT::ValueType VT = Op.getValueType(); + switch (TLI.getOperationAction(ISD::UNDEF, VT)) { + case Expand: + case Promote: + if (MVT::isInteger(VT)) + Result = DAG.getConstant(0, VT); + else if (MVT::isFloatingPoint(VT)) + Result = DAG.getConstantFP(0, VT); + else + assert(0 && "Unknown value type!"); + break; + case Legal: + break; + } + break; + } case ISD::Constant: // We know we don't need to expand constants here, constants only have one // value and we check that it is fine above. @@ -1018,6 +1035,9 @@ SDOperand SelectionDAGLegalize::PromoteOp(SDOperand Op) { std::cerr << "NODE: "; Node->dump(); std::cerr << "\n"; assert(0 && "Do not know how to promote this operator!"); abort(); + case ISD::UNDEF: + Result = DAG.getNode(ISD::UNDEF, NVT); + break; case ISD::Constant: Result = DAG.getNode(ISD::ZERO_EXTEND, NVT, Op); assert(isa<ConstantSDNode>(Result) && "Didn't constant fold zext?"); @@ -1574,6 +1594,10 @@ void SelectionDAGLegalize::ExpandOp(SDOperand Op, SDOperand &Lo, SDOperand &Hi){ std::cerr << "NODE: "; Node->dump(); std::cerr << "\n"; assert(0 && "Do not know how to expand this operator!"); abort(); + case ISD::UNDEF: + Lo = DAG.getNode(ISD::UNDEF, NVT); + Hi = DAG.getNode(ISD::UNDEF, NVT); + break; case ISD::Constant: { uint64_t Cst = cast<ConstantSDNode>(Node)->getValue(); Lo = DAG.getConstant(Cst, NVT); |