-//===-- MipsISelDAGToDAG.cpp - A dag to dag inst selector for Mips --------===//
+//===-- MipsISelDAGToDAG.cpp - A Dag to Dag Inst Selector for Mips --------===//
//
// The LLVM Compiler Infrastructure
//
#define DEBUG_TYPE "mips-isel"
#include "Mips.h"
-#include "MipsISelLowering.h"
+#include "MipsAnalyzeImmediate.h"
#include "MipsMachineFunction.h"
#include "MipsRegisterInfo.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
+#include "MCTargetDesc/MipsBaseInfo.h"
#include "llvm/GlobalValue.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
+#include "llvm/CodeGen/SelectionDAGNodes.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
namespace {
-class VISIBILITY_HIDDEN MipsDAGToDAGISel : public SelectionDAGISel {
+class MipsDAGToDAGISel : public SelectionDAGISel {
/// TM - Keep a reference to MipsTargetMachine.
MipsTargetMachine &TM;
/// Subtarget - Keep a pointer to the MipsSubtarget around so that we can
/// make the right decision when generating code for different targets.
const MipsSubtarget &Subtarget;
-
+
public:
explicit MipsDAGToDAGISel(MipsTargetMachine &tm) :
SelectionDAGISel(tm),
TM(tm), Subtarget(tm.getSubtarget<MipsSubtarget>()) {}
-
- virtual void InstructionSelect();
// Pass Name
virtual const char *getPassName() const {
return "MIPS DAG->DAG Pattern Instruction Selection";
- }
-
+ }
+
+ virtual bool runOnMachineFunction(MachineFunction &MF);
-private:
+private:
// Include the pieces autogenerated from the target description.
#include "MipsGenDAGISel.inc"
- SDValue getGlobalBaseReg();
- SDNode *Select(SDValue N);
+ /// getTargetMachine - Return a reference to the TargetMachine, casted
+ /// to the target-specific type.
+ const MipsTargetMachine &getTargetMachine() {
+ return static_cast<const MipsTargetMachine &>(TM);
+ }
- // Complex Pattern.
- bool SelectAddr(SDValue Op, SDValue N,
- SDValue &Base, SDValue &Offset);
+ /// getInstrInfo - Return a reference to the TargetInstrInfo, casted
+ /// to the target-specific type.
+ const MipsInstrInfo *getInstrInfo() {
+ return getTargetMachine().getInstrInfo();
+ }
+ SDNode *getGlobalBaseReg();
- // getI32Imm - Return a target constant with the specified
- // value, of type i32.
- inline SDValue getI32Imm(unsigned Imm) {
- return CurDAG->getTargetConstant(Imm, MVT::i32);
+ std::pair<SDNode*, SDNode*> SelectMULT(SDNode *N, unsigned Opc, DebugLoc dl,
+ EVT Ty, bool HasLo, bool HasHi);
+
+ SDNode *Select(SDNode *N);
+
+ // Complex Pattern.
+ bool SelectAddr(SDNode *Parent, SDValue N, SDValue &Base, SDValue &Offset);
+
+ // getImm - Return a target constant with the specified value.
+ inline SDValue getImm(const SDNode *Node, unsigned Imm) {
+ return CurDAG->getTargetConstant(Imm, Node->getValueType(0));
}
+ void ProcessFunctionAfterISel(MachineFunction &MF);
+ bool ReplaceUsesWithZeroReg(MachineRegisterInfo *MRI, const MachineInstr&);
+ void InitGlobalBaseReg(MachineFunction &MF);
- #ifndef NDEBUG
- unsigned Indent;
- #endif
+ virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
+ char ConstraintCode,
+ std::vector<SDValue> &OutOps);
};
}
-/// InstructionSelect - This callback is invoked by
-/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
-void MipsDAGToDAGISel::
-InstructionSelect()
-{
- DEBUG(BB->dump());
- // Codegen the basic block.
- #ifndef NDEBUG
- DOUT << "===== Instruction selection begins:\n";
- Indent = 0;
- #endif
-
- // Select target instructions for the DAG.
- SelectRoot(*CurDAG);
-
- #ifndef NDEBUG
- DOUT << "===== Instruction selection ends:\n";
- #endif
-
- CurDAG->RemoveDeadNodes();
+// Insert instructions to initialize the global base register in the
+// first MBB of the function. When the ABI is O32 and the relocation model is
+// PIC, the necessary instructions are emitted later to prevent optimization
+// passes from moving them.
+void MipsDAGToDAGISel::InitGlobalBaseReg(MachineFunction &MF) {
+ MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
+
+ if (!MipsFI->globalBaseRegSet())
+ return;
+
+ MachineBasicBlock &MBB = MF.front();
+ MachineBasicBlock::iterator I = MBB.begin();
+ MachineRegisterInfo &RegInfo = MF.getRegInfo();
+ const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
+ DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
+ unsigned V0, V1, GlobalBaseReg = MipsFI->getGlobalBaseReg();
+ bool FixGlobalBaseReg = MipsFI->globalBaseRegFixed();
+
+ if (Subtarget.isABI_O32() && FixGlobalBaseReg)
+ // $gp is the global base register.
+ V0 = V1 = GlobalBaseReg;
+ else {
+ const TargetRegisterClass *RC;
+ RC = Subtarget.isABI_N64() ?
+ Mips::CPU64RegsRegisterClass : Mips::CPURegsRegisterClass;
+
+ V0 = RegInfo.createVirtualRegister(RC);
+ V1 = RegInfo.createVirtualRegister(RC);
+ }
+
+ if (Subtarget.isABI_N64()) {
+ MF.getRegInfo().addLiveIn(Mips::T9_64);
+
+ // lui $v0, %hi(%neg(%gp_rel(fname)))
+ // daddu $v1, $v0, $t9
+ // daddiu $globalbasereg, $v1, %lo(%neg(%gp_rel(fname)))
+ const GlobalValue *FName = MF.getFunction();
+ BuildMI(MBB, I, DL, TII.get(Mips::LUi64), V0)
+ .addGlobalAddress(FName, 0, MipsII::MO_GPOFF_HI);
+ BuildMI(MBB, I, DL, TII.get(Mips::DADDu), V1).addReg(V0).addReg(Mips::T9_64);
+ BuildMI(MBB, I, DL, TII.get(Mips::DADDiu), GlobalBaseReg).addReg(V1)
+ .addGlobalAddress(FName, 0, MipsII::MO_GPOFF_LO);
+ } else if (MF.getTarget().getRelocationModel() == Reloc::Static) {
+ // Set global register to __gnu_local_gp.
+ //
+ // lui $v0, %hi(__gnu_local_gp)
+ // addiu $globalbasereg, $v0, %lo(__gnu_local_gp)
+ BuildMI(MBB, I, DL, TII.get(Mips::LUi), V0)
+ .addExternalSymbol("__gnu_local_gp", MipsII::MO_ABS_HI);
+ BuildMI(MBB, I, DL, TII.get(Mips::ADDiu), GlobalBaseReg).addReg(V0)
+ .addExternalSymbol("__gnu_local_gp", MipsII::MO_ABS_LO);
+ } else {
+ MF.getRegInfo().addLiveIn(Mips::T9);
+
+ if (Subtarget.isABI_N32()) {
+ // lui $v0, %hi(%neg(%gp_rel(fname)))
+ // addu $v1, $v0, $t9
+ // addiu $globalbasereg, $v1, %lo(%neg(%gp_rel(fname)))
+ const GlobalValue *FName = MF.getFunction();
+ BuildMI(MBB, I, DL, TII.get(Mips::LUi), V0)
+ .addGlobalAddress(FName, 0, MipsII::MO_GPOFF_HI);
+ BuildMI(MBB, I, DL, TII.get(Mips::ADDu), V1).addReg(V0).addReg(Mips::T9);
+ BuildMI(MBB, I, DL, TII.get(Mips::ADDiu), GlobalBaseReg).addReg(V1)
+ .addGlobalAddress(FName, 0, MipsII::MO_GPOFF_LO);
+ } else if (!MipsFI->globalBaseRegFixed()) {
+ assert(Subtarget.isABI_O32());
+
+ BuildMI(MBB, I, DL, TII.get(Mips::SETGP2), GlobalBaseReg)
+ .addReg(Mips::T9);
+ }
+ }
+}
+
+bool MipsDAGToDAGISel::ReplaceUsesWithZeroReg(MachineRegisterInfo *MRI,
+ const MachineInstr& MI) {
+ unsigned DstReg = 0, ZeroReg = 0;
+
+ // Check if MI is "addiu $dst, $zero, 0" or "daddiu $dst, $zero, 0".
+ if ((MI.getOpcode() == Mips::ADDiu) &&
+ (MI.getOperand(1).getReg() == Mips::ZERO) &&
+ (MI.getOperand(2).getImm() == 0)) {
+ DstReg = MI.getOperand(0).getReg();
+ ZeroReg = Mips::ZERO;
+ } else if ((MI.getOpcode() == Mips::DADDiu) &&
+ (MI.getOperand(1).getReg() == Mips::ZERO_64) &&
+ (MI.getOperand(2).getImm() == 0)) {
+ DstReg = MI.getOperand(0).getReg();
+ ZeroReg = Mips::ZERO_64;
+ }
+
+ if (!DstReg)
+ return false;
+
+ // Replace uses with ZeroReg.
+ for (MachineRegisterInfo::use_iterator U = MRI->use_begin(DstReg),
+ E = MRI->use_end(); U != E; ++U) {
+ MachineOperand &MO = U.getOperand();
+ MachineInstr *MI = MO.getParent();
+
+ // Do not replace if it is a phi's operand or is tied to def operand.
+ if (MI->isPHI() || MI->isRegTiedToDefOperand(U.getOperandNo()))
+ continue;
+
+ MO.setReg(ZeroReg);
+ }
+
+ return true;
+}
+
+void MipsDAGToDAGISel::ProcessFunctionAfterISel(MachineFunction &MF) {
+ InitGlobalBaseReg(MF);
+
+ MachineRegisterInfo *MRI = &MF.getRegInfo();
+
+ for (MachineFunction::iterator MFI = MF.begin(), MFE = MF.end(); MFI != MFE;
+ ++MFI)
+ for (MachineBasicBlock::iterator I = MFI->begin(); I != MFI->end(); ++I)
+ ReplaceUsesWithZeroReg(MRI, *I);
+}
+
+bool MipsDAGToDAGISel::runOnMachineFunction(MachineFunction &MF) {
+ bool Ret = SelectionDAGISel::runOnMachineFunction(MF);
+
+ ProcessFunctionAfterISel(MF);
+
+ return Ret;
}
/// getGlobalBaseReg - Output the instructions required to put the
/// GOT address into a register.
-SDValue MipsDAGToDAGISel::getGlobalBaseReg() {
- MachineFunction* MF = BB->getParent();
- unsigned GP = 0;
- for(MachineRegisterInfo::livein_iterator ii = MF->getRegInfo().livein_begin(),
- ee = MF->getRegInfo().livein_end(); ii != ee; ++ii)
- if (ii->first == Mips::GP) {
- GP = ii->second;
- break;
- }
- assert(GP && "GOT PTR not in liveins");
- // FIXME is there a sensible place to get debug info for this?
- return CurDAG->getCopyFromReg(CurDAG->getEntryNode(),
- DebugLoc::getUnknownLoc(), GP, MVT::i32);
+SDNode *MipsDAGToDAGISel::getGlobalBaseReg() {
+ unsigned GlobalBaseReg = MF->getInfo<MipsFunctionInfo>()->getGlobalBaseReg();
+ return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
}
/// ComplexPattern used on MipsInstrInfo
/// Used on Mips Load/Store instructions
bool MipsDAGToDAGISel::
-SelectAddr(SDValue Op, SDValue Addr, SDValue &Offset, SDValue &Base)
-{
+SelectAddr(SDNode *Parent, SDValue Addr, SDValue &Base, SDValue &Offset) {
+ EVT ValTy = Addr.getValueType();
+
+ // If Parent is an unaligned f32 load or store, select a (base + index)
+ // floating point load/store instruction (luxc1 or suxc1).
+ const LSBaseSDNode* LS = 0;
+
+ if (Parent && (LS = dyn_cast<LSBaseSDNode>(Parent))) {
+ EVT VT = LS->getMemoryVT();
+
+ if (VT.getSizeInBits() / 8 > LS->getAlignment()) {
+ assert(TLI.allowsUnalignedMemoryAccesses(VT) &&
+ "Unaligned loads/stores not supported for this type.");
+ if (VT == MVT::f32)
+ return false;
+ }
+ }
+
// if Address is FI, get the TargetFrameIndex.
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
- Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
- Offset = CurDAG->getTargetConstant(0, MVT::i32);
+ Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), ValTy);
+ Offset = CurDAG->getTargetConstant(0, ValTy);
return true;
}
-
+
// on PIC code Load GA
- if (TM.getRelocationModel() == Reloc::PIC_) {
- if ((Addr.getOpcode() == ISD::TargetGlobalAddress) ||
- (Addr.getOpcode() == ISD::TargetJumpTable)){
- Base = CurDAG->getRegister(Mips::GP, MVT::i32);
- Offset = Addr;
- return true;
- }
- } else {
+ if (Addr.getOpcode() == MipsISD::Wrapper) {
+ Base = Addr.getOperand(0);
+ Offset = Addr.getOperand(1);
+ return true;
+ }
+
+ if (TM.getRelocationModel() != Reloc::PIC_) {
if ((Addr.getOpcode() == ISD::TargetExternalSymbol ||
Addr.getOpcode() == ISD::TargetGlobalAddress))
return false;
- }
-
+ }
+
+ // Addresses of the form FI+const or FI|const
+ if (CurDAG->isBaseWithConstantOffset(Addr)) {
+ ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1));
+ if (isInt<16>(CN->getSExtValue())) {
+
+ // If the first operand is a FI, get the TargetFI Node
+ if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>
+ (Addr.getOperand(0)))
+ Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), ValTy);
+ else
+ Base = Addr.getOperand(0);
+
+ Offset = CurDAG->getTargetConstant(CN->getZExtValue(), ValTy);
+ return true;
+ }
+ }
+
// Operand is a result from an ADD.
if (Addr.getOpcode() == ISD::ADD) {
- if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
- if (Predicate_immSExt16(CN)) {
-
- // If the first operand is a FI, get the TargetFI Node
- if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>
- (Addr.getOperand(0))) {
- Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
- } else {
- Base = Addr.getOperand(0);
- }
-
- Offset = CurDAG->getTargetConstant(CN->getZExtValue(), MVT::i32);
+ // When loading from constant pools, load the lower address part in
+ // the instruction itself. Example, instead of:
+ // lui $2, %hi($CPI1_0)
+ // addiu $2, $2, %lo($CPI1_0)
+ // lwc1 $f0, 0($2)
+ // Generate:
+ // lui $2, %hi($CPI1_0)
+ // lwc1 $f0, %lo($CPI1_0)($2)
+ if (Addr.getOperand(1).getOpcode() == MipsISD::Lo) {
+ SDValue LoVal = Addr.getOperand(1);
+ if (isa<ConstantPoolSDNode>(LoVal.getOperand(0)) ||
+ isa<GlobalAddressSDNode>(LoVal.getOperand(0))) {
+ Base = Addr.getOperand(0);
+ Offset = LoVal.getOperand(0);
return true;
}
}
+
+ // If an indexed floating point load/store can be emitted, return false.
+ if (LS && (LS->getMemoryVT() == MVT::f32 || LS->getMemoryVT() == MVT::f64) &&
+ Subtarget.hasMips32r2Or64())
+ return false;
}
Base = Addr;
- Offset = CurDAG->getTargetConstant(0, MVT::i32);
+ Offset = CurDAG->getTargetConstant(0, ValTy);
return true;
}
+/// Select multiply instructions.
+std::pair<SDNode*, SDNode*>
+MipsDAGToDAGISel::SelectMULT(SDNode *N, unsigned Opc, DebugLoc dl, EVT Ty,
+ bool HasLo, bool HasHi) {
+ SDNode *Lo = 0, *Hi = 0;
+ SDNode *Mul = CurDAG->getMachineNode(Opc, dl, MVT::Glue, N->getOperand(0),
+ N->getOperand(1));
+ SDValue InFlag = SDValue(Mul, 0);
+
+ if (HasLo) {
+ Lo = CurDAG->getMachineNode(Ty == MVT::i32 ? Mips::MFLO : Mips::MFLO64, dl,
+ Ty, MVT::Glue, InFlag);
+ InFlag = SDValue(Lo, 1);
+ }
+ if (HasHi)
+ Hi = CurDAG->getMachineNode(Ty == MVT::i32 ? Mips::MFHI : Mips::MFHI64, dl,
+ Ty, InFlag);
+
+ return std::make_pair(Lo, Hi);
+}
+
+
/// Select instructions not customized! Used for
/// expanded, promoted and normal instructions
-SDNode* MipsDAGToDAGISel::
-Select(SDValue N)
-{
- SDNode *Node = N.getNode();
+SDNode* MipsDAGToDAGISel::Select(SDNode *Node) {
unsigned Opcode = Node->getOpcode();
DebugLoc dl = Node->getDebugLoc();
// Dump information about the Node being selected
- #ifndef NDEBUG
- DOUT << std::string(Indent, ' ') << "Selecting: ";
- DEBUG(Node->dump(CurDAG));
- DOUT << "\n";
- Indent += 2;
- #endif
+ DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
// If we have a custom node, we already have selected!
if (Node->isMachineOpcode()) {
- #ifndef NDEBUG
- DOUT << std::string(Indent-2, ' ') << "== ";
- DEBUG(Node->dump(CurDAG));
- DOUT << "\n";
- Indent -= 2;
- #endif
+ DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
return NULL;
}
///
- // Instruction Selection not handled by the auto-generated
+ // Instruction Selection not handled by the auto-generated
// tablegen selection should be handled here.
- ///
+ ///
+ EVT NodeTy = Node->getValueType(0);
+ unsigned MultOpc;
+
switch(Opcode) {
+ default: break;
+
+ case ISD::SUBE:
+ case ISD::ADDE: {
+ SDValue InFlag = Node->getOperand(2), CmpLHS;
+ unsigned Opc = InFlag.getOpcode(); (void)Opc;
+ assert(((Opc == ISD::ADDC || Opc == ISD::ADDE) ||
+ (Opc == ISD::SUBC || Opc == ISD::SUBE)) &&
+ "(ADD|SUB)E flag operand must come from (ADD|SUB)C/E insn");
+
+ unsigned MOp;
+ if (Opcode == ISD::ADDE) {
+ CmpLHS = InFlag.getValue(0);
+ MOp = Mips::ADDu;
+ } else {
+ CmpLHS = InFlag.getOperand(0);
+ MOp = Mips::SUBu;
+ }
- default: break;
-
- case ISD::SUBE:
- case ISD::ADDE: {
- SDValue InFlag = Node->getOperand(2), CmpLHS;
- unsigned Opc = InFlag.getOpcode(); Opc=Opc;
- assert(((Opc == ISD::ADDC || Opc == ISD::ADDE) ||
- (Opc == ISD::SUBC || Opc == ISD::SUBE)) &&
- "(ADD|SUB)E flag operand must come from (ADD|SUB)C/E insn");
-
- unsigned MOp;
- if (Opcode == ISD::ADDE) {
- CmpLHS = InFlag.getValue(0);
- MOp = Mips::ADDu;
- } else {
- CmpLHS = InFlag.getOperand(0);
- MOp = Mips::SUBu;
- }
+ SDValue Ops[] = { CmpLHS, InFlag.getOperand(1) };
- SDValue Ops[] = { CmpLHS, InFlag.getOperand(1) };
+ SDValue LHS = Node->getOperand(0);
+ SDValue RHS = Node->getOperand(1);
- SDValue LHS = Node->getOperand(0);
- SDValue RHS = Node->getOperand(1);
+ EVT VT = LHS.getValueType();
+ SDNode *Carry = CurDAG->getMachineNode(Mips::SLTu, dl, VT, Ops, 2);
+ SDNode *AddCarry = CurDAG->getMachineNode(Mips::ADDu, dl, VT,
+ SDValue(Carry,0), RHS);
- MVT VT = LHS.getValueType();
- SDNode *Carry = CurDAG->getTargetNode(Mips::SLTu, dl, VT, Ops, 2);
- SDNode *AddCarry = CurDAG->getTargetNode(Mips::ADDu, dl, VT,
- SDValue(Carry,0), RHS);
+ return CurDAG->SelectNodeTo(Node, MOp, VT, MVT::Glue,
+ LHS, SDValue(AddCarry,0));
+ }
- return CurDAG->SelectNodeTo(N.getNode(), MOp, VT, MVT::Flag,
- LHS, SDValue(AddCarry,0));
- }
+ /// Mul with two results
+ case ISD::SMUL_LOHI:
+ case ISD::UMUL_LOHI: {
+ if (NodeTy == MVT::i32)
+ MultOpc = (Opcode == ISD::UMUL_LOHI ? Mips::MULTu : Mips::MULT);
+ else
+ MultOpc = (Opcode == ISD::UMUL_LOHI ? Mips::DMULTu : Mips::DMULT);
- /// Mul/Div with two results
- case ISD::SDIVREM:
- case ISD::UDIVREM:
- case ISD::SMUL_LOHI:
- case ISD::UMUL_LOHI: {
- SDValue Op1 = Node->getOperand(0);
- SDValue Op2 = Node->getOperand(1);
-
- unsigned Op;
- if (Opcode == ISD::UMUL_LOHI || Opcode == ISD::SMUL_LOHI)
- Op = (Opcode == ISD::UMUL_LOHI ? Mips::MULTu : Mips::MULT);
- else
- Op = (Opcode == ISD::UDIVREM ? Mips::DIVu : Mips::DIV);
+ std::pair<SDNode*, SDNode*> LoHi = SelectMULT(Node, MultOpc, dl, NodeTy,
+ true, true);
+
+ if (!SDValue(Node, 0).use_empty())
+ ReplaceUses(SDValue(Node, 0), SDValue(LoHi.first, 0));
- SDNode *Node = CurDAG->getTargetNode(Op, dl, MVT::Flag, Op1, Op2);
+ if (!SDValue(Node, 1).use_empty())
+ ReplaceUses(SDValue(Node, 1), SDValue(LoHi.second, 0));
- SDValue InFlag = SDValue(Node, 0);
- SDNode *Lo = CurDAG->getTargetNode(Mips::MFLO, dl, MVT::i32,
- MVT::Flag, InFlag);
- InFlag = SDValue(Lo,1);
- SDNode *Hi = CurDAG->getTargetNode(Mips::MFHI, dl, MVT::i32, InFlag);
+ return NULL;
+ }
- if (!N.getValue(0).use_empty())
- ReplaceUses(N.getValue(0), SDValue(Lo,0));
+ /// Special Muls
+ case ISD::MUL: {
+ // Mips32 has a 32-bit three operand mul instruction.
+ if (Subtarget.hasMips32() && NodeTy == MVT::i32)
+ break;
+ return SelectMULT(Node, NodeTy == MVT::i32 ? Mips::MULT : Mips::DMULT,
+ dl, NodeTy, true, false).first;
+ }
+ case ISD::MULHS:
+ case ISD::MULHU: {
+ if (NodeTy == MVT::i32)
+ MultOpc = (Opcode == ISD::MULHU ? Mips::MULTu : Mips::MULT);
+ else
+ MultOpc = (Opcode == ISD::MULHU ? Mips::DMULTu : Mips::DMULT);
+
+ return SelectMULT(Node, MultOpc, dl, NodeTy, false, true).second;
+ }
- if (!N.getValue(1).use_empty())
- ReplaceUses(N.getValue(1), SDValue(Hi,0));
+ // Get target GOT address.
+ case ISD::GLOBAL_OFFSET_TABLE:
+ return getGlobalBaseReg();
+
+ case ISD::ConstantFP: {
+ ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(Node);
+ if (Node->getValueType(0) == MVT::f64 && CN->isExactlyValue(+0.0)) {
+ if (Subtarget.hasMips64()) {
+ SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
+ Mips::ZERO_64, MVT::i64);
+ return CurDAG->getMachineNode(Mips::DMTC1, dl, MVT::f64, Zero);
+ }
- return NULL;
+ SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
+ Mips::ZERO, MVT::i32);
+ return CurDAG->getMachineNode(Mips::BuildPairF64, dl, MVT::f64, Zero,
+ Zero);
}
+ break;
+ }
- /// Special Muls
- case ISD::MUL:
- case ISD::MULHS:
- case ISD::MULHU: {
- SDValue MulOp1 = Node->getOperand(0);
- SDValue MulOp2 = Node->getOperand(1);
-
- unsigned MulOp = (Opcode == ISD::MULHU ? Mips::MULTu : Mips::MULT);
- SDNode *MulNode = CurDAG->getTargetNode(MulOp, dl,
- MVT::Flag, MulOp1, MulOp2);
+ case ISD::Constant: {
+ const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Node);
+ unsigned Size = CN->getValueSizeInBits(0);
- SDValue InFlag = SDValue(MulNode, 0);
+ if (Size == 32)
+ break;
- if (MulOp == ISD::MUL)
- return CurDAG->getTargetNode(Mips::MFLO, dl, MVT::i32, InFlag);
- else
- return CurDAG->getTargetNode(Mips::MFHI, dl, MVT::i32, InFlag);
+ MipsAnalyzeImmediate AnalyzeImm;
+ int64_t Imm = CN->getSExtValue();
+
+ const MipsAnalyzeImmediate::InstSeq &Seq =
+ AnalyzeImm.Analyze(Imm, Size, false);
+
+ MipsAnalyzeImmediate::InstSeq::const_iterator Inst = Seq.begin();
+ DebugLoc DL = CN->getDebugLoc();
+ SDNode *RegOpnd;
+ SDValue ImmOpnd = CurDAG->getTargetConstant(SignExtend64<16>(Inst->ImmOpnd),
+ MVT::i64);
+
+ // The first instruction can be a LUi which is different from other
+ // instructions (ADDiu, ORI and SLL) in that it does not have a register
+ // operand.
+ if (Inst->Opc == Mips::LUi64)
+ RegOpnd = CurDAG->getMachineNode(Inst->Opc, DL, MVT::i64, ImmOpnd);
+ else
+ RegOpnd =
+ CurDAG->getMachineNode(Inst->Opc, DL, MVT::i64,
+ CurDAG->getRegister(Mips::ZERO_64, MVT::i64),
+ ImmOpnd);
+
+ // The remaining instructions in the sequence are handled here.
+ for (++Inst; Inst != Seq.end(); ++Inst) {
+ ImmOpnd = CurDAG->getTargetConstant(SignExtend64<16>(Inst->ImmOpnd),
+ MVT::i64);
+ RegOpnd = CurDAG->getMachineNode(Inst->Opc, DL, MVT::i64,
+ SDValue(RegOpnd, 0), ImmOpnd);
}
- /// Div/Rem operations
- case ISD::SREM:
- case ISD::UREM:
- case ISD::SDIV:
- case ISD::UDIV: {
- SDValue Op1 = Node->getOperand(0);
- SDValue Op2 = Node->getOperand(1);
-
- unsigned Op, MOp;
- if (Opcode == ISD::SDIV || Opcode == ISD::UDIV) {
- Op = (Opcode == ISD::SDIV ? Mips::DIV : Mips::DIVu);
- MOp = Mips::MFLO;
- } else {
- Op = (Opcode == ISD::SREM ? Mips::DIV : Mips::DIVu);
- MOp = Mips::MFHI;
- }
- SDNode *Node = CurDAG->getTargetNode(Op, dl, MVT::Flag, Op1, Op2);
-
- SDValue InFlag = SDValue(Node, 0);
- return CurDAG->getTargetNode(MOp, dl, MVT::i32, InFlag);
- }
+ return RegOpnd;
+ }
- // Get target GOT address.
- case ISD::GLOBAL_OFFSET_TABLE: {
- SDValue Result = getGlobalBaseReg();
- ReplaceUses(N, Result);
- return NULL;
+ case MipsISD::ThreadPointer: {
+ EVT PtrVT = TLI.getPointerTy();
+ unsigned RdhwrOpc, SrcReg, DestReg;
+
+ if (PtrVT == MVT::i32) {
+ RdhwrOpc = Mips::RDHWR;
+ SrcReg = Mips::HWR29;
+ DestReg = Mips::V1;
+ } else {
+ RdhwrOpc = Mips::RDHWR64;
+ SrcReg = Mips::HWR29_64;
+ DestReg = Mips::V1_64;
}
- /// Handle direct and indirect calls when using PIC. On PIC, when
- /// GOT is smaller than about 64k (small code) the GA target is
- /// loaded with only one instruction. Otherwise GA's target must
- /// be loaded with 3 instructions.
- case MipsISD::JmpLink: {
- if (TM.getRelocationModel() == Reloc::PIC_) {
- //bool isCodeLarge = (TM.getCodeModel() == CodeModel::Large);
- SDValue Chain = Node->getOperand(0);
- SDValue Callee = Node->getOperand(1);
- SDValue T9Reg = CurDAG->getRegister(Mips::T9, MVT::i32);
- SDValue InFlag(0, 0);
-
- if ( (isa<GlobalAddressSDNode>(Callee)) ||
- (isa<ExternalSymbolSDNode>(Callee)) )
- {
- /// Direct call for global addresses and external symbols
- SDValue GPReg = CurDAG->getRegister(Mips::GP, MVT::i32);
-
- // Use load to get GOT target
- SDValue Ops[] = { Callee, GPReg, Chain };
- SDValue Load = SDValue(CurDAG->getTargetNode(Mips::LW, dl, MVT::i32,
- MVT::Other, Ops, 3), 0);
- Chain = Load.getValue(1);
-
- // Call target must be on T9
- Chain = CurDAG->getCopyToReg(Chain, dl, T9Reg, Load, InFlag);
- } else
- /// Indirect call
- Chain = CurDAG->getCopyToReg(Chain, dl, T9Reg, Callee, InFlag);
-
- // Emit Jump and Link Register
- SDNode *ResNode = CurDAG->getTargetNode(Mips::JALR, dl, MVT::Other,
- MVT::Flag, T9Reg, Chain);
- Chain = SDValue(ResNode, 0);
- InFlag = SDValue(ResNode, 1);
- ReplaceUses(SDValue(Node, 0), Chain);
- ReplaceUses(SDValue(Node, 1), InFlag);
- return ResNode;
- }
- }
+ SDNode *Rdhwr =
+ CurDAG->getMachineNode(RdhwrOpc, Node->getDebugLoc(),
+ Node->getValueType(0),
+ CurDAG->getRegister(SrcReg, PtrVT));
+ SDValue Chain = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, DestReg,
+ SDValue(Rdhwr, 0));
+ SDValue ResNode = CurDAG->getCopyFromReg(Chain, dl, DestReg, PtrVT);
+ ReplaceUses(SDValue(Node, 0), ResNode);
+ return ResNode.getNode();
+ }
}
// Select the default instruction
- SDNode *ResNode = SelectCode(N);
+ SDNode *ResNode = SelectCode(Node);
- #ifndef NDEBUG
- DOUT << std::string(Indent-2, ' ') << "=> ";
- if (ResNode == NULL || ResNode == N.getNode())
- DEBUG(N.getNode()->dump(CurDAG));
+ DEBUG(errs() << "=> ");
+ if (ResNode == NULL || ResNode == Node)
+ DEBUG(Node->dump(CurDAG));
else
DEBUG(ResNode->dump(CurDAG));
- DOUT << "\n";
- Indent -= 2;
- #endif
-
+ DEBUG(errs() << "\n");
return ResNode;
}
-/// createMipsISelDag - This pass converts a legalized DAG into a
+bool MipsDAGToDAGISel::
+SelectInlineAsmMemoryOperand(const SDValue &Op, char ConstraintCode,
+ std::vector<SDValue> &OutOps) {
+ assert(ConstraintCode == 'm' && "unexpected asm memory constraint");
+ OutOps.push_back(Op);
+ return false;
+}
+
+/// createMipsISelDag - This pass converts a legalized DAG into a
/// MIPS-specific DAG, ready for instruction scheduling.
FunctionPass *llvm::createMipsISelDag(MipsTargetMachine &TM) {
return new MipsDAGToDAGISel(TM);
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