llvm-6502/lib/Target/Mips/MipsISelDAGToDAG.cpp
Reed Kotler f99998a2b0 This patch is for the implementation of mips16 complex pattern addr16.
Previously mips16 was sharing the pattern addr which is used for mips32
and mips64. This had a number of problems:
1) Storing and loading byte and halfword quantities for mips16 has particular
problems due to the primarily non mips16 nature of SP. When we must
load/store byte/halfword stack objects in a function, we must create a mips16
alias register for SP. This functionality is tested in stchar.ll.
2) We need to have an FP register under certain conditions (such as 
dynamically sized alloca). We use mips16 register S0 for this purpose.
In this case, we also use this register when accessing frame objects so this
issue also affects the complex pattern addr16. This functionality is
tested in alloca16.ll.

The Mips16InstrInfo.td has been updated to use addr16 instead of addr.

The complex pattern C++ function for addr has been copied to addr16 and
updated to reflect the above issues.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166897 91177308-0d34-0410-b5e6-96231b3b80d8
2012-10-28 06:02:37 +00:00

771 lines
26 KiB
C++

//===-- MipsISelDAGToDAG.cpp - A Dag to Dag Inst Selector for Mips --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the MIPS target.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "mips-isel"
#include "Mips.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/Support/CFG.h"
#include "llvm/Type.h"
#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.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/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// MipsDAGToDAGISel - MIPS specific code to select MIPS machine
// instructions for SelectionDAG operations.
//===----------------------------------------------------------------------===//
namespace {
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>()) {}
// Pass Name
virtual const char *getPassName() const {
return "MIPS DAG->DAG Pattern Instruction Selection";
}
virtual bool runOnMachineFunction(MachineFunction &MF);
private:
// Include the pieces autogenerated from the target description.
#include "MipsGenDAGISel.inc"
/// getTargetMachine - Return a reference to the TargetMachine, casted
/// to the target-specific type.
const MipsTargetMachine &getTargetMachine() {
return static_cast<const MipsTargetMachine &>(TM);
}
/// getInstrInfo - Return a reference to the TargetInstrInfo, casted
/// to the target-specific type.
const MipsInstrInfo *getInstrInfo() {
return getTargetMachine().getInstrInfo();
}
SDNode *getGlobalBaseReg();
SDValue getMips16SPAliasReg();
void getMips16SPRefReg(SDNode *parent, SDValue &AliasReg);
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);
bool SelectAddr16(SDNode *Parent, SDValue N, SDValue &Base, SDValue &Offset,
SDValue &Alias);
// 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);
void InitMips16SPAliasReg(MachineFunction &MF);
virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
char ConstraintCode,
std::vector<SDValue> &OutOps);
};
}
// 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, V2, GlobalBaseReg = MipsFI->getGlobalBaseReg();
const TargetRegisterClass *RC;
if (Subtarget.isABI_N64())
RC = (const TargetRegisterClass*)&Mips::CPU64RegsRegClass;
else if (Subtarget.inMips16Mode())
RC = (const TargetRegisterClass*)&Mips::CPU16RegsRegClass;
else
RC = (const TargetRegisterClass*)&Mips::CPURegsRegClass;
V0 = RegInfo.createVirtualRegister(RC);
V1 = RegInfo.createVirtualRegister(RC);
V2 = RegInfo.createVirtualRegister(RC);
if (Subtarget.isABI_N64()) {
MF.getRegInfo().addLiveIn(Mips::T9_64);
MBB.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);
return;
}
if (Subtarget.inMips16Mode()) {
BuildMI(MBB, I, DL, TII.get(Mips::LiRxImmX16), V0)
.addExternalSymbol("_gp_disp", MipsII::MO_ABS_HI);
BuildMI(MBB, I, DL, TII.get(Mips::AddiuRxPcImmX16), V1)
.addExternalSymbol("_gp_disp", MipsII::MO_ABS_LO);
BuildMI(MBB, I, DL, TII.get(Mips::SllX16), V2).addReg(V0).addImm(16);
BuildMI(MBB, I, DL, TII.get(Mips::AdduRxRyRz16), GlobalBaseReg)
.addReg(V1).addReg(V2);
return;
}
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);
return;
}
MF.getRegInfo().addLiveIn(Mips::T9);
MBB.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);
return;
}
assert(Subtarget.isABI_O32());
// For O32 ABI, the following instruction sequence is emitted to initialize
// the global base register:
//
// 0. lui $2, %hi(_gp_disp)
// 1. addiu $2, $2, %lo(_gp_disp)
// 2. addu $globalbasereg, $2, $t9
//
// We emit only the last instruction here.
//
// GNU linker requires that the first two instructions appear at the beginning
// of a function and no instructions be inserted before or between them.
// The two instructions are emitted during lowering to MC layer in order to
// avoid any reordering.
//
// Register $2 (Mips::V0) is added to the list of live-in registers to ensure
// the value instruction 1 (addiu) defines is valid when instruction 2 (addu)
// reads it.
MF.getRegInfo().addLiveIn(Mips::V0);
MBB.addLiveIn(Mips::V0);
BuildMI(MBB, I, DL, TII.get(Mips::ADDu), GlobalBaseReg)
.addReg(Mips::V0).addReg(Mips::T9);
}
// Insert instructions to initialize the Mips16 SP Alias register in the
// first MBB of the function.
//
void MipsDAGToDAGISel::InitMips16SPAliasReg(MachineFunction &MF) {
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
if (!MipsFI->mips16SPAliasRegSet())
return;
MachineBasicBlock &MBB = MF.front();
MachineBasicBlock::iterator I = MBB.begin();
const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
DebugLoc DL = I != MBB.end() ? I->getDebugLoc() : DebugLoc();
unsigned Mips16SPAliasReg = MipsFI->getMips16SPAliasReg();
BuildMI(MBB, I, DL, TII.get(Mips::MoveR3216), Mips16SPAliasReg)
.addReg(Mips::SP);
}
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;) {
MachineOperand &MO = U.getOperand();
unsigned OpNo = U.getOperandNo();
MachineInstr *MI = MO.getParent();
++U;
// Do not replace if it is a phi's operand or is tied to def operand.
if (MI->isPHI() || MI->isRegTiedToDefOperand(OpNo) || MI->isPseudo())
continue;
MO.setReg(ZeroReg);
}
return true;
}
void MipsDAGToDAGISel::ProcessFunctionAfterISel(MachineFunction &MF) {
InitGlobalBaseReg(MF);
InitMips16SPAliasReg(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.
SDNode *MipsDAGToDAGISel::getGlobalBaseReg() {
unsigned GlobalBaseReg = MF->getInfo<MipsFunctionInfo>()->getGlobalBaseReg();
return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
}
/// getMips16SPAliasReg - Output the instructions required to put the
/// SP into a Mips16 accessible aliased register.
SDValue MipsDAGToDAGISel::getMips16SPAliasReg() {
unsigned Mips16SPAliasReg =
MF->getInfo<MipsFunctionInfo>()->getMips16SPAliasReg();
return CurDAG->getRegister(Mips16SPAliasReg, TLI.getPointerTy());
}
/// ComplexPattern used on MipsInstrInfo
/// Used on Mips Load/Store instructions
bool MipsDAGToDAGISel::
SelectAddr(SDNode *Parent, SDValue Addr, SDValue &Base, SDValue &Offset) {
EVT ValTy = Addr.getValueType();
// if Address is FI, get the TargetFrameIndex.
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), ValTy);
Offset = CurDAG->getTargetConstant(0, ValTy);
return true;
}
// on PIC code Load GA
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) {
// 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 ||
Addr.getOperand(1).getOpcode() == MipsISD::GPRel) {
SDValue Opnd0 = Addr.getOperand(1).getOperand(0);
if (isa<ConstantPoolSDNode>(Opnd0) || isa<GlobalAddressSDNode>(Opnd0) ||
isa<JumpTableSDNode>(Opnd0)) {
Base = Addr.getOperand(0);
Offset = Opnd0;
return true;
}
}
// If an indexed floating point load/store can be emitted, return false.
const LSBaseSDNode *LS = dyn_cast<LSBaseSDNode>(Parent);
if (LS &&
(LS->getMemoryVT() == MVT::f32 || LS->getMemoryVT() == MVT::f64) &&
Subtarget.hasMips32r2Or64())
return false;
}
Base = Addr;
Offset = CurDAG->getTargetConstant(0, ValTy);
return true;
}
void MipsDAGToDAGISel::getMips16SPRefReg(SDNode *Parent, SDValue &AliasReg) {
SDValue AliasFPReg = CurDAG->getRegister(Mips::S0, TLI.getPointerTy());
if (Parent) {
switch (Parent->getOpcode()) {
case ISD::LOAD: {
LoadSDNode *SD = dyn_cast<LoadSDNode>(Parent);
switch (SD->getMemoryVT().getSizeInBits()) {
case 8:
case 16:
AliasReg = TM.getFrameLowering()->hasFP(*MF)?
AliasFPReg: getMips16SPAliasReg();
return;
}
break;
}
case ISD::STORE: {
StoreSDNode *SD = dyn_cast<StoreSDNode>(Parent);
switch (SD->getMemoryVT().getSizeInBits()) {
case 8:
case 16:
AliasReg = TM.getFrameLowering()->hasFP(*MF)?
AliasFPReg: getMips16SPAliasReg();
return;
}
break;
}
}
}
AliasReg = CurDAG->getRegister(Mips::SP, TLI.getPointerTy());
return;
}
bool MipsDAGToDAGISel::SelectAddr16(
SDNode *Parent, SDValue Addr, SDValue &Base, SDValue &Offset,
SDValue &Alias) {
EVT ValTy = Addr.getValueType();
Alias = CurDAG->getTargetConstant(0, ValTy);
// if Address is FI, get the TargetFrameIndex.
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), ValTy);
Offset = CurDAG->getTargetConstant(0, ValTy);
getMips16SPRefReg(Parent, Alias);
return true;
}
// on PIC code Load GA
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);
getMips16SPRefReg(Parent, Alias);
}
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) {
// 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 ||
Addr.getOperand(1).getOpcode() == MipsISD::GPRel) {
SDValue Opnd0 = Addr.getOperand(1).getOperand(0);
if (isa<ConstantPoolSDNode>(Opnd0) || isa<GlobalAddressSDNode>(Opnd0) ||
isa<JumpTableSDNode>(Opnd0)) {
Base = Addr.getOperand(0);
Offset = Opnd0;
return true;
}
}
// If an indexed floating point load/store can be emitted, return false.
const LSBaseSDNode *LS = dyn_cast<LSBaseSDNode>(Parent);
if (LS &&
(LS->getMemoryVT() == MVT::f32 || LS->getMemoryVT() == MVT::f64) &&
Subtarget.hasMips32r2Or64())
return false;
}
Base = Addr;
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) {
unsigned Opcode = Subtarget.inMips16Mode() ? Mips::Mflo16 :
(Ty == MVT::i32 ? Mips::MFLO : Mips::MFLO64);
Lo = CurDAG->getMachineNode(Opcode, dl, Ty, MVT::Glue, InFlag);
InFlag = SDValue(Lo, 1);
}
if (HasHi) {
unsigned Opcode = Subtarget.inMips16Mode() ? Mips::Mfhi16 :
(Ty == MVT::i32 ? Mips::MFHI : Mips::MFHI64);
Hi = CurDAG->getMachineNode(Opcode, dl, Ty, InFlag);
}
return std::make_pair(Lo, Hi);
}
/// Select instructions not customized! Used for
/// expanded, promoted and normal instructions
SDNode* MipsDAGToDAGISel::Select(SDNode *Node) {
unsigned Opcode = Node->getOpcode();
DebugLoc dl = Node->getDebugLoc();
// Dump information about the Node being selected
DEBUG(errs() << "Selecting: "; Node->dump(CurDAG); errs() << "\n");
// If we have a custom node, we already have selected!
if (Node->isMachineOpcode()) {
DEBUG(errs() << "== "; Node->dump(CurDAG); errs() << "\n");
return NULL;
}
///
// 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: {
bool inMips16Mode = Subtarget.inMips16Mode();
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);
if (inMips16Mode)
MOp = Mips::AdduRxRyRz16;
else
MOp = Mips::ADDu;
} else {
CmpLHS = InFlag.getOperand(0);
if (inMips16Mode)
MOp = Mips::SubuRxRyRz16;
else
MOp = Mips::SUBu;
}
SDValue Ops[] = { CmpLHS, InFlag.getOperand(1) };
SDValue LHS = Node->getOperand(0);
SDValue RHS = Node->getOperand(1);
EVT VT = LHS.getValueType();
unsigned Sltu_op = inMips16Mode? Mips::SltuRxRyRz16: Mips::SLTu;
SDNode *Carry = CurDAG->getMachineNode(Sltu_op, dl, VT, Ops, 2);
unsigned Addu_op = inMips16Mode? Mips::AdduRxRyRz16 : Mips::ADDu;
SDNode *AddCarry = CurDAG->getMachineNode(Addu_op, dl, VT,
SDValue(Carry,0), RHS);
return CurDAG->SelectNodeTo(Node, MOp, VT, MVT::Glue,
LHS, SDValue(AddCarry,0));
}
/// Mul with two results
case ISD::SMUL_LOHI:
case ISD::UMUL_LOHI: {
if (NodeTy == MVT::i32) {
if (Subtarget.inMips16Mode())
MultOpc = (Opcode == ISD::UMUL_LOHI ? Mips::MultuRxRy16 :
Mips::MultRxRy16);
else
MultOpc = (Opcode == ISD::UMUL_LOHI ? Mips::MULTu : Mips::MULT);
}
else
MultOpc = (Opcode == ISD::UMUL_LOHI ? Mips::DMULTu : Mips::DMULT);
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));
if (!SDValue(Node, 1).use_empty())
ReplaceUses(SDValue(Node, 1), SDValue(LoHi.second, 0));
return NULL;
}
/// 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) {
if (Subtarget.inMips16Mode())
MultOpc = (Opcode == ISD::MULHU ?
Mips::MultuRxRy16 : Mips::MultRxRy16);
else
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;
}
// 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);
}
SDValue Zero = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
Mips::ZERO, MVT::i32);
return CurDAG->getMachineNode(Mips::BuildPairF64, dl, MVT::f64, Zero,
Zero);
}
break;
}
case ISD::Constant: {
const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Node);
unsigned Size = CN->getValueSizeInBits(0);
if (Size == 32)
break;
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);
}
return RegOpnd;
}
#ifndef NDEBUG
case ISD::LOAD:
case ISD::STORE:
assert(cast<MemSDNode>(Node)->getMemoryVT().getSizeInBits() / 8 <=
cast<MemSDNode>(Node)->getAlignment() &&
"Unexpected unaligned loads/stores.");
break;
#endif
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;
}
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(Node);
DEBUG(errs() << "=> ");
if (ResNode == NULL || ResNode == Node)
DEBUG(Node->dump(CurDAG));
else
DEBUG(ResNode->dump(CurDAG));
DEBUG(errs() << "\n");
return ResNode;
}
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);
}