1 //===-- XCoreISelDAGToDAG.cpp - A dag to dag inst selector for XCore ------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines an instruction selector for the XCore target.
12 //===----------------------------------------------------------------------===//
15 #include "XCoreISelLowering.h"
16 #include "XCoreTargetMachine.h"
17 #include "llvm/DerivedTypes.h"
18 #include "llvm/Function.h"
19 #include "llvm/Intrinsics.h"
20 #include "llvm/CallingConv.h"
21 #include "llvm/Constants.h"
22 #include "llvm/CodeGen/MachineFrameInfo.h"
23 #include "llvm/CodeGen/MachineFunction.h"
24 #include "llvm/CodeGen/MachineInstrBuilder.h"
25 #include "llvm/CodeGen/MachineRegisterInfo.h"
26 #include "llvm/CodeGen/SelectionDAG.h"
27 #include "llvm/CodeGen/SelectionDAGISel.h"
28 #include "llvm/Target/TargetLowering.h"
29 #include "llvm/Support/Compiler.h"
30 #include "llvm/Support/Debug.h"
35 /// XCoreDAGToDAGISel - XCore specific code to select XCore machine
36 /// instructions for SelectionDAG operations.
39 class XCoreDAGToDAGISel : public SelectionDAGISel {
40 XCoreTargetLowering &Lowering;
41 const XCoreSubtarget &Subtarget;
44 XCoreDAGToDAGISel(XCoreTargetMachine &TM)
45 : SelectionDAGISel(TM),
46 Lowering(*TM.getTargetLowering()),
47 Subtarget(*TM.getSubtargetImpl()) { }
49 SDNode *Select(SDValue Op);
51 /// getI32Imm - Return a target constant with the specified value, of type
53 inline SDValue getI32Imm(unsigned Imm) {
54 return CurDAG->getTargetConstant(Imm, MVT::i32);
57 // Complex Pattern Selectors.
58 bool SelectADDRspii(SDValue Op, SDValue Addr, SDValue &Base,
60 bool SelectADDRdpii(SDValue Op, SDValue Addr, SDValue &Base,
62 bool SelectADDRcpii(SDValue Op, SDValue Addr, SDValue &Base,
65 virtual void InstructionSelect();
67 virtual const char *getPassName() const {
68 return "XCore DAG->DAG Pattern Instruction Selection";
71 // Include the pieces autogenerated from the target description.
72 #include "XCoreGenDAGISel.inc"
74 } // end anonymous namespace
76 /// createXCoreISelDag - This pass converts a legalized DAG into a
77 /// XCore-specific DAG, ready for instruction scheduling.
79 FunctionPass *llvm::createXCoreISelDag(XCoreTargetMachine &TM) {
80 return new XCoreDAGToDAGISel(TM);
83 bool XCoreDAGToDAGISel::SelectADDRspii(SDValue Op, SDValue Addr,
84 SDValue &Base, SDValue &Offset) {
85 FrameIndexSDNode *FIN = 0;
86 if ((FIN = dyn_cast<FrameIndexSDNode>(Addr))) {
87 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
88 Offset = CurDAG->getTargetConstant(0, MVT::i32);
91 if (Addr.getOpcode() == ISD::ADD) {
92 ConstantSDNode *CN = 0;
93 if ((FIN = dyn_cast<FrameIndexSDNode>(Addr.getOperand(0)))
94 && (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
95 && (CN->getSExtValue() % 4 == 0 && CN->getSExtValue() >= 0)) {
96 // Constant positive word offset from frame index
97 Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
98 Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);
105 bool XCoreDAGToDAGISel::SelectADDRdpii(SDValue Op, SDValue Addr,
106 SDValue &Base, SDValue &Offset) {
107 if (Addr.getOpcode() == XCoreISD::DPRelativeWrapper) {
108 Base = Addr.getOperand(0);
109 Offset = CurDAG->getTargetConstant(0, MVT::i32);
112 if (Addr.getOpcode() == ISD::ADD) {
113 ConstantSDNode *CN = 0;
114 if ((Addr.getOperand(0).getOpcode() == XCoreISD::DPRelativeWrapper)
115 && (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
116 && (CN->getSExtValue() % 4 == 0)) {
117 // Constant word offset from a object in the data region
118 Base = Addr.getOperand(0).getOperand(0);
119 Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);
126 bool XCoreDAGToDAGISel::SelectADDRcpii(SDValue Op, SDValue Addr,
127 SDValue &Base, SDValue &Offset) {
128 if (Addr.getOpcode() == XCoreISD::CPRelativeWrapper) {
129 Base = Addr.getOperand(0);
130 Offset = CurDAG->getTargetConstant(0, MVT::i32);
133 if (Addr.getOpcode() == ISD::ADD) {
134 ConstantSDNode *CN = 0;
135 if ((Addr.getOperand(0).getOpcode() == XCoreISD::CPRelativeWrapper)
136 && (CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1)))
137 && (CN->getSExtValue() % 4 == 0)) {
138 // Constant word offset from a object in the data region
139 Base = Addr.getOperand(0).getOperand(0);
140 Offset = CurDAG->getTargetConstant(CN->getSExtValue(), MVT::i32);
147 /// InstructionSelect - This callback is invoked by
148 /// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
149 void XCoreDAGToDAGISel::
150 InstructionSelect() {
153 // Select target instructions for the DAG.
156 CurDAG->RemoveDeadNodes();
159 SDNode *XCoreDAGToDAGISel::Select(SDValue Op) {
160 SDNode *N = Op.getNode();
161 MVT NVT = N->getValueType(0);
162 if (NVT == MVT::i32) {
163 switch (N->getOpcode()) {
165 case ISD::Constant: {
166 if (Predicate_immMskBitp(N)) {
167 SDValue MskSize = Transform_msksize_xform(N);
168 return CurDAG->getTargetNode(XCore::MKMSK_rus, MVT::i32, MskSize);
170 else if (! Predicate_immU16(N)) {
171 unsigned Val = cast<ConstantSDNode>(N)->getZExtValue();
173 CurDAG->getTargetConstantPool(ConstantInt::get(Type::Int32Ty, Val),
175 return CurDAG->getTargetNode(XCore::LDWCP_lru6, MVT::i32, MVT::Other,
176 CPIdx, CurDAG->getEntryNode());
180 case ISD::SMUL_LOHI: {
181 // FIXME fold addition into the macc instruction
182 if (!Subtarget.isXS1A()) {
183 SDValue Zero(CurDAG->getTargetNode(XCore::LDC_ru6, MVT::i32,
184 CurDAG->getTargetConstant(0, MVT::i32)), 0);
185 SDValue Ops[] = { Zero, Zero, Op.getOperand(0), Op.getOperand(1) };
186 SDNode *ResNode = CurDAG->getTargetNode(XCore::MACCS_l4r, MVT::i32,
188 ReplaceUses(SDValue(N, 0), SDValue(ResNode, 1));
189 ReplaceUses(SDValue(N, 1), SDValue(ResNode, 0));
194 case ISD::UMUL_LOHI: {
195 // FIXME fold addition into the macc / lmul instruction
196 SDValue Zero(CurDAG->getTargetNode(XCore::LDC_ru6, MVT::i32,
197 CurDAG->getTargetConstant(0, MVT::i32)), 0);
198 SDValue Ops[] = { Op.getOperand(0), Op.getOperand(1),
200 SDNode *ResNode = CurDAG->getTargetNode(XCore::LMUL_l6r, MVT::i32,
202 ReplaceUses(SDValue(N, 0), SDValue(ResNode, 1));
203 ReplaceUses(SDValue(N, 1), SDValue(ResNode, 0));
206 case XCoreISD::LADD: {
207 if (!Subtarget.isXS1A()) {
208 SDValue Ops[] = { Op.getOperand(0), Op.getOperand(1),
210 return CurDAG->getTargetNode(XCore::LADD_l5r, MVT::i32, MVT::i32,
215 case XCoreISD::LSUB: {
216 if (!Subtarget.isXS1A()) {
217 SDValue Ops[] = { Op.getOperand(0), Op.getOperand(1),
219 return CurDAG->getTargetNode(XCore::LSUB_l5r, MVT::i32, MVT::i32,
224 // Other cases are autogenerated.
227 return SelectCode(Op);