PPCISelDAGToDAG.cpp [plain text]
#include "PPC.h"
#include "MCTargetDesc/PPCPredicates.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCTargetMachine.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
#define DEBUG_TYPE "ppc-codegen"
cl::opt<bool> ANDIGlueBug("expose-ppc-andi-glue-bug",
cl::desc("expose the ANDI glue bug on PPC"), cl::Hidden);
static cl::opt<bool>
UseBitPermRewriter("ppc-use-bit-perm-rewriter", cl::init(true),
cl::desc("use aggressive ppc isel for bit permutations"),
cl::Hidden);
static cl::opt<bool> BPermRewriterNoMasking(
"ppc-bit-perm-rewriter-stress-rotates",
cl::desc("stress rotate selection in aggressive ppc isel for "
"bit permutations"),
cl::Hidden);
namespace llvm {
void initializePPCDAGToDAGISelPass(PassRegistry&);
}
namespace {
class PPCDAGToDAGISel : public SelectionDAGISel {
const PPCTargetMachine &TM;
const PPCSubtarget *PPCSubTarget;
const PPCTargetLowering *PPCLowering;
unsigned GlobalBaseReg;
public:
explicit PPCDAGToDAGISel(PPCTargetMachine &tm)
: SelectionDAGISel(tm), TM(tm) {
initializePPCDAGToDAGISelPass(*PassRegistry::getPassRegistry());
}
bool runOnMachineFunction(MachineFunction &MF) override {
GlobalBaseReg = 0;
PPCSubTarget = &MF.getSubtarget<PPCSubtarget>();
PPCLowering = PPCSubTarget->getTargetLowering();
SelectionDAGISel::runOnMachineFunction(MF);
if (!PPCSubTarget->isSVR4ABI())
InsertVRSaveCode(MF);
return true;
}
void PreprocessISelDAG() override;
void PostprocessISelDAG() override;
inline SDValue getI32Imm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
}
inline SDValue getI64Imm(uint64_t Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i64);
}
inline SDValue getSmallIPtrImm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, PPCLowering->getPointerTy());
}
static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME);
static bool isRotateAndMask(SDNode *N, unsigned Mask, bool isShiftMask,
unsigned &SH, unsigned &MB, unsigned &ME);
SDNode *getGlobalBaseReg();
SDNode *getFrameIndex(SDNode *SN, SDNode *N, unsigned Offset = 0);
SDNode *Select(SDNode *N) override;
SDNode *SelectBitfieldInsert(SDNode *N);
SDNode *SelectBitPermutation(SDNode *N);
SDValue SelectCC(SDValue LHS, SDValue RHS, ISD::CondCode CC, SDLoc dl);
bool SelectAddrImm(SDValue N, SDValue &Disp,
SDValue &Base) {
return PPCLowering->SelectAddressRegImm(N, Disp, Base, *CurDAG, false);
}
bool SelectAddrImmOffs(SDValue N, SDValue &Out) const {
if (N.getOpcode() == ISD::TargetConstant ||
N.getOpcode() == ISD::TargetGlobalAddress) {
Out = N;
return true;
}
return false;
}
bool SelectAddrIdx(SDValue N, SDValue &Base, SDValue &Index) {
return PPCLowering->SelectAddressRegReg(N, Base, Index, *CurDAG);
}
bool SelectAddrIdxOnly(SDValue N, SDValue &Base, SDValue &Index) {
return PPCLowering->SelectAddressRegRegOnly(N, Base, Index, *CurDAG);
}
bool SelectAddrImmX4(SDValue N, SDValue &Disp, SDValue &Base) {
return PPCLowering->SelectAddressRegImm(N, Disp, Base, *CurDAG, true);
}
bool SelectAddr(SDValue N, SDValue &Base) {
Base = N;
return true;
}
bool SelectInlineAsmMemoryOperand(const SDValue &Op,
char ConstraintCode,
std::vector<SDValue> &OutOps) override {
const TargetRegisterInfo *TRI = PPCSubTarget->getRegisterInfo();
const TargetRegisterClass *TRC = TRI->getPointerRegClass(*MF, 1);
SDValue RC = CurDAG->getTargetConstant(TRC->getID(), MVT::i32);
SDValue NewOp =
SDValue(CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
SDLoc(Op), Op.getValueType(),
Op, RC), 0);
OutOps.push_back(NewOp);
return false;
}
void InsertVRSaveCode(MachineFunction &MF);
const char *getPassName() const override {
return "PowerPC DAG->DAG Pattern Instruction Selection";
}
#include "PPCGenDAGISel.inc"
private:
SDNode *SelectSETCC(SDNode *N);
void PeepholePPC64();
void PeepholePPC64ZExt();
void PeepholeCROps();
SDValue combineToCMPB(SDNode *N);
void foldBoolExts(SDValue &Res, SDNode *&N);
bool AllUsersSelectZero(SDNode *N);
void SwapAllSelectUsers(SDNode *N);
SDNode *transferMemOperands(SDNode *N, SDNode *Result);
};
}
void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
bool HasVectorVReg = false;
for (unsigned i = 0, e = RegInfo->getNumVirtRegs(); i != e; ++i) {
unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
if (RegInfo->getRegClass(Reg) == &PPC::VRRCRegClass) {
HasVectorVReg = true;
break;
}
}
if (!HasVectorVReg) return;
unsigned InVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
unsigned UpdatedVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
const TargetInstrInfo &TII = *PPCSubTarget->getInstrInfo();
MachineBasicBlock &EntryBB = *Fn.begin();
DebugLoc dl;
MachineBasicBlock::iterator IP = EntryBB.begin(); BuildMI(EntryBB, IP, dl, TII.get(PPC::MFVRSAVE), InVRSAVE);
BuildMI(EntryBB, IP, dl, TII.get(PPC::UPDATE_VRSAVE),
UpdatedVRSAVE).addReg(InVRSAVE);
BuildMI(EntryBB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(UpdatedVRSAVE);
for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
if (!BB->empty() && BB->back().isReturn()) {
IP = BB->end(); --IP;
MachineBasicBlock::iterator I2 = IP;
while (I2 != BB->begin() && (--I2)->isTerminator())
IP = I2;
BuildMI(*BB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(InVRSAVE);
}
}
}
SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
if (!GlobalBaseReg) {
const TargetInstrInfo &TII = *PPCSubTarget->getInstrInfo();
MachineBasicBlock &FirstMBB = MF->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
const Module *M = MF->getFunction()->getParent();
DebugLoc dl;
if (PPCLowering->getPointerTy() == MVT::i32) {
if (PPCSubTarget->isTargetELF()) {
GlobalBaseReg = PPC::R30;
if (M->getPICLevel() == PICLevel::Small) {
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MoveGOTtoLR));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
} else {
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
unsigned TempReg = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
BuildMI(FirstMBB, MBBI, dl,
TII.get(PPC::UpdateGBR), GlobalBaseReg)
.addReg(TempReg, RegState::Define).addReg(GlobalBaseReg);
MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
}
} else {
GlobalBaseReg =
RegInfo->createVirtualRegister(&PPC::GPRC_NOR0RegClass);
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
}
} else {
GlobalBaseReg = RegInfo->createVirtualRegister(&PPC::G8RC_NOX0RegClass);
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR8));
BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR8), GlobalBaseReg);
}
}
return CurDAG->getRegister(GlobalBaseReg,
PPCLowering->getPointerTy()).getNode();
}
static bool isIntS16Immediate(SDNode *N, short &Imm) {
if (N->getOpcode() != ISD::Constant)
return false;
Imm = (short)cast<ConstantSDNode>(N)->getZExtValue();
if (N->getValueType(0) == MVT::i32)
return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
else
return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
}
static bool isIntS16Immediate(SDValue Op, short &Imm) {
return isIntS16Immediate(Op.getNode(), Imm);
}
static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
Imm = cast<ConstantSDNode>(N)->getZExtValue();
return true;
}
return false;
}
static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
Imm = cast<ConstantSDNode>(N)->getZExtValue();
return true;
}
return false;
}
static bool isInt32Immediate(SDValue N, unsigned &Imm) {
return isInt32Immediate(N.getNode(), Imm);
}
static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
return N->getOpcode() == Opc
&& isInt32Immediate(N->getOperand(1).getNode(), Imm);
}
SDNode *PPCDAGToDAGISel::getFrameIndex(SDNode *SN, SDNode *N, unsigned Offset) {
SDLoc dl(SN);
int FI = cast<FrameIndexSDNode>(N)->getIndex();
SDValue TFI = CurDAG->getTargetFrameIndex(FI, N->getValueType(0));
unsigned Opc = N->getValueType(0) == MVT::i32 ? PPC::ADDI : PPC::ADDI8;
if (SN->hasOneUse())
return CurDAG->SelectNodeTo(SN, Opc, N->getValueType(0), TFI,
getSmallIPtrImm(Offset));
return CurDAG->getMachineNode(Opc, dl, N->getValueType(0), TFI,
getSmallIPtrImm(Offset));
}
bool PPCDAGToDAGISel::isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
if (!Val)
return false;
if (isShiftedMask_32(Val)) {
MB = countLeadingZeros(Val);
ME = countLeadingZeros((Val - 1) ^ Val);
return true;
} else {
Val = ~Val; if (isShiftedMask_32(Val)) {
ME = countLeadingZeros(Val) - 1;
MB = countLeadingZeros((Val - 1) ^ Val) + 1;
return true;
}
}
return false;
}
bool PPCDAGToDAGISel::isRotateAndMask(SDNode *N, unsigned Mask,
bool isShiftMask, unsigned &SH,
unsigned &MB, unsigned &ME) {
if (N->getValueType(0) != MVT::i32)
return false;
unsigned Shift = 32;
unsigned Indeterminant = ~0; unsigned Opcode = N->getOpcode();
if (N->getNumOperands() != 2 ||
!isInt32Immediate(N->getOperand(1).getNode(), Shift) || (Shift > 31))
return false;
if (Opcode == ISD::SHL) {
if (isShiftMask) Mask = Mask << Shift;
Indeterminant = ~(0xFFFFFFFFu << Shift);
} else if (Opcode == ISD::SRL) {
if (isShiftMask) Mask = Mask >> Shift;
Indeterminant = ~(0xFFFFFFFFu >> Shift);
Shift = 32 - Shift;
} else if (Opcode == ISD::ROTL) {
Indeterminant = 0;
} else {
return false;
}
if (Mask && !(Mask & Indeterminant)) {
SH = Shift & 31;
return isRunOfOnes(Mask, MB, ME);
}
return false;
}
SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
SDValue Op0 = N->getOperand(0);
SDValue Op1 = N->getOperand(1);
SDLoc dl(N);
APInt LKZ, LKO, RKZ, RKO;
CurDAG->computeKnownBits(Op0, LKZ, LKO);
CurDAG->computeKnownBits(Op1, RKZ, RKO);
unsigned TargetMask = LKZ.getZExtValue();
unsigned InsertMask = RKZ.getZExtValue();
if ((TargetMask | InsertMask) == 0xFFFFFFFF) {
unsigned Op0Opc = Op0.getOpcode();
unsigned Op1Opc = Op1.getOpcode();
unsigned Value, SH = 0;
TargetMask = ~TargetMask;
InsertMask = ~InsertMask;
if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
Op0.getOperand(0).getOpcode() == ISD::SRL) {
if (Op1.getOperand(0).getOpcode() != ISD::SHL &&
Op1.getOperand(0).getOpcode() != ISD::SRL) {
std::swap(Op0, Op1);
std::swap(Op0Opc, Op1Opc);
std::swap(TargetMask, InsertMask);
}
}
} else if (Op0Opc == ISD::SHL || Op0Opc == ISD::SRL) {
if (Op1Opc == ISD::AND && Op1.getOperand(0).getOpcode() != ISD::SHL &&
Op1.getOperand(0).getOpcode() != ISD::SRL) {
std::swap(Op0, Op1);
std::swap(Op0Opc, Op1Opc);
std::swap(TargetMask, InsertMask);
}
}
unsigned MB, ME;
if (isRunOfOnes(InsertMask, MB, ME)) {
SDValue Tmp1, Tmp2;
if ((Op1Opc == ISD::SHL || Op1Opc == ISD::SRL) &&
isInt32Immediate(Op1.getOperand(1), Value)) {
Op1 = Op1.getOperand(0);
SH = (Op1Opc == ISD::SHL) ? Value : 32 - Value;
}
if (Op1Opc == ISD::AND) {
APInt MKZ, MKO;
CurDAG->computeKnownBits(Op1.getOperand(1), MKZ, MKO);
bool CanFoldMask = InsertMask == MKO.getZExtValue();
unsigned SHOpc = Op1.getOperand(0).getOpcode();
if ((SHOpc == ISD::SHL || SHOpc == ISD::SRL) && CanFoldMask &&
isInt32Immediate(Op1.getOperand(0).getOperand(1), Value)) {
Op1 = Op1.getOperand(0).getOperand(0);
SH = (SHOpc == ISD::SHL) ? Value : 32 - Value;
}
}
SH &= 31;
SDValue Ops[] = { Op0, Op1, getI32Imm(SH), getI32Imm(MB),
getI32Imm(ME) };
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops);
}
}
return nullptr;
}
static unsigned SelectInt64CountDirect(int64_t Imm) {
unsigned Remainder = 0;
unsigned Shift = 0;
if (!isInt<32>(Imm)) {
Shift = countTrailingZeros<uint64_t>(Imm);
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
if (isInt<32>(ImmSh)) {
Imm = ImmSh;
} else {
Remainder = Imm;
Shift = 32;
Imm >>= 32;
}
}
unsigned Result = 0;
unsigned Lo = Imm & 0xFFFF;
unsigned Hi = (Imm >> 16) & 0xFFFF;
if (isInt<16>(Imm)) {
++Result;
} else if (Lo) {
Result += 2;
} else {
++Result;
}
if (!Shift) return Result;
if (Imm)
++Result;
if ((Hi = (Remainder >> 16) & 0xFFFF))
++Result;
if ((Lo = Remainder & 0xFFFF))
++Result;
return Result;
}
static uint64_t Rot64(uint64_t Imm, unsigned R) {
return (Imm << R) | (Imm >> (64 - R));
}
static unsigned SelectInt64Count(int64_t Imm) {
unsigned Count = SelectInt64CountDirect(Imm);
if (Count == 1)
return Count;
for (unsigned r = 1; r < 63; ++r) {
uint64_t RImm = Rot64(Imm, r);
unsigned RCount = SelectInt64CountDirect(RImm) + 1;
Count = std::min(Count, RCount);
unsigned LS = findLastSet(RImm);
if (LS != r-1)
continue;
uint64_t OnesMask = -(int64_t) (UINT64_C(1) << (LS+1));
uint64_t RImmWithOnes = RImm | OnesMask;
RCount = SelectInt64CountDirect(RImmWithOnes) + 1;
Count = std::min(Count, RCount);
}
return Count;
}
static SDNode *SelectInt64Direct(SelectionDAG *CurDAG, SDLoc dl, int64_t Imm) {
unsigned Remainder = 0;
unsigned Shift = 0;
if (!isInt<32>(Imm)) {
Shift = countTrailingZeros<uint64_t>(Imm);
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
if (isInt<32>(ImmSh)) {
Imm = ImmSh;
} else {
Remainder = Imm;
Shift = 32;
Imm >>= 32;
}
}
SDNode *Result;
unsigned Lo = Imm & 0xFFFF;
unsigned Hi = (Imm >> 16) & 0xFFFF;
auto getI32Imm = [CurDAG](unsigned Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
};
if (isInt<16>(Imm)) {
Result = CurDAG->getMachineNode(PPC::LI8, dl, MVT::i64, getI32Imm(Lo));
} else if (Lo) {
unsigned OpC = Hi ? PPC::LIS8 : PPC::LI8;
Result = CurDAG->getMachineNode(OpC, dl, MVT::i64, getI32Imm(Hi));
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
SDValue(Result, 0), getI32Imm(Lo));
} else {
Result = CurDAG->getMachineNode(PPC::LIS8, dl, MVT::i64, getI32Imm(Hi));
}
if (!Shift) return Result;
if (Imm) {
Result = CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64,
SDValue(Result, 0),
getI32Imm(Shift),
getI32Imm(63 - Shift));
}
if ((Hi = (Remainder >> 16) & 0xFFFF)) {
Result = CurDAG->getMachineNode(PPC::ORIS8, dl, MVT::i64,
SDValue(Result, 0), getI32Imm(Hi));
}
if ((Lo = Remainder & 0xFFFF)) {
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
SDValue(Result, 0), getI32Imm(Lo));
}
return Result;
}
static SDNode *SelectInt64(SelectionDAG *CurDAG, SDLoc dl, int64_t Imm) {
unsigned Count = SelectInt64CountDirect(Imm);
if (Count == 1)
return SelectInt64Direct(CurDAG, dl, Imm);
unsigned RMin = 0;
int64_t MatImm;
unsigned MaskEnd;
for (unsigned r = 1; r < 63; ++r) {
uint64_t RImm = Rot64(Imm, r);
unsigned RCount = SelectInt64CountDirect(RImm) + 1;
if (RCount < Count) {
Count = RCount;
RMin = r;
MatImm = RImm;
MaskEnd = 63;
}
unsigned LS = findLastSet(RImm);
if (LS != r-1)
continue;
uint64_t OnesMask = -(int64_t) (UINT64_C(1) << (LS+1));
uint64_t RImmWithOnes = RImm | OnesMask;
RCount = SelectInt64CountDirect(RImmWithOnes) + 1;
if (RCount < Count) {
Count = RCount;
RMin = r;
MatImm = RImmWithOnes;
MaskEnd = LS;
}
}
if (!RMin)
return SelectInt64Direct(CurDAG, dl, Imm);
auto getI32Imm = [CurDAG](unsigned Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
};
SDValue Val = SDValue(SelectInt64Direct(CurDAG, dl, MatImm), 0);
return CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64, Val,
getI32Imm(64 - RMin), getI32Imm(MaskEnd));
}
static SDNode *SelectInt64(SelectionDAG *CurDAG, SDNode *N) {
SDLoc dl(N);
int64_t Imm = cast<ConstantSDNode>(N)->getZExtValue();
return SelectInt64(CurDAG, dl, Imm);
}
namespace {
class BitPermutationSelector {
struct ValueBit {
SDValue V;
unsigned Idx;
enum Kind {
ConstZero,
Variable
} K;
ValueBit(SDValue V, unsigned I, Kind K = Variable)
: V(V), Idx(I), K(K) {}
ValueBit(Kind K = Variable)
: V(SDValue(nullptr, 0)), Idx(UINT32_MAX), K(K) {}
bool isZero() const {
return K == ConstZero;
}
bool hasValue() const {
return K == Variable;
}
SDValue getValue() const {
assert(hasValue() && "Cannot get the value of a constant bit");
return V;
}
unsigned getValueBitIndex() const {
assert(hasValue() && "Cannot get the value bit index of a constant bit");
return Idx;
}
};
struct BitGroup {
SDValue V;
unsigned RLAmt;
unsigned StartIdx, EndIdx;
bool Repl32;
bool Repl32CR;
bool Repl32Coalesced;
BitGroup(SDValue V, unsigned R, unsigned S, unsigned E)
: V(V), RLAmt(R), StartIdx(S), EndIdx(E), Repl32(false), Repl32CR(false),
Repl32Coalesced(false) {
DEBUG(dbgs() << "\tbit group for " << V.getNode() << " RLAmt = " << R <<
" [" << S << ", " << E << "]\n");
}
};
struct ValueRotInfo {
SDValue V;
unsigned RLAmt;
unsigned NumGroups;
unsigned FirstGroupStartIdx;
bool Repl32;
ValueRotInfo()
: RLAmt(UINT32_MAX), NumGroups(0), FirstGroupStartIdx(UINT32_MAX),
Repl32(false) {}
bool operator < (const ValueRotInfo &Other) const {
if (Repl32 < Other.Repl32)
return true;
else if (Repl32 > Other.Repl32)
return false;
else if (NumGroups > Other.NumGroups)
return true;
else if (NumGroups < Other.NumGroups)
return false;
else if (FirstGroupStartIdx < Other.FirstGroupStartIdx)
return true;
return false;
}
};
bool getValueBits(SDValue V, SmallVector<ValueBit, 64> &Bits) {
switch (V.getOpcode()) {
default: break;
case ISD::ROTL:
if (isa<ConstantSDNode>(V.getOperand(1))) {
unsigned RotAmt = V.getConstantOperandVal(1);
SmallVector<ValueBit, 64> LHSBits(Bits.size());
getValueBits(V.getOperand(0), LHSBits);
for (unsigned i = 0; i < Bits.size(); ++i)
Bits[i] = LHSBits[i < RotAmt ? i + (Bits.size() - RotAmt) : i - RotAmt];
return true;
}
break;
case ISD::SHL:
if (isa<ConstantSDNode>(V.getOperand(1))) {
unsigned ShiftAmt = V.getConstantOperandVal(1);
SmallVector<ValueBit, 64> LHSBits(Bits.size());
getValueBits(V.getOperand(0), LHSBits);
for (unsigned i = ShiftAmt; i < Bits.size(); ++i)
Bits[i] = LHSBits[i - ShiftAmt];
for (unsigned i = 0; i < ShiftAmt; ++i)
Bits[i] = ValueBit(ValueBit::ConstZero);
return true;
}
break;
case ISD::SRL:
if (isa<ConstantSDNode>(V.getOperand(1))) {
unsigned ShiftAmt = V.getConstantOperandVal(1);
SmallVector<ValueBit, 64> LHSBits(Bits.size());
getValueBits(V.getOperand(0), LHSBits);
for (unsigned i = 0; i < Bits.size() - ShiftAmt; ++i)
Bits[i] = LHSBits[i + ShiftAmt];
for (unsigned i = Bits.size() - ShiftAmt; i < Bits.size(); ++i)
Bits[i] = ValueBit(ValueBit::ConstZero);
return true;
}
break;
case ISD::AND:
if (isa<ConstantSDNode>(V.getOperand(1))) {
uint64_t Mask = V.getConstantOperandVal(1);
SmallVector<ValueBit, 64> LHSBits(Bits.size());
bool LHSTrivial = getValueBits(V.getOperand(0), LHSBits);
for (unsigned i = 0; i < Bits.size(); ++i)
if (((Mask >> i) & 1) == 1)
Bits[i] = LHSBits[i];
else
Bits[i] = ValueBit(ValueBit::ConstZero);
return LHSTrivial;
}
break;
case ISD::OR: {
SmallVector<ValueBit, 64> LHSBits(Bits.size()), RHSBits(Bits.size());
getValueBits(V.getOperand(0), LHSBits);
getValueBits(V.getOperand(1), RHSBits);
bool AllDisjoint = true;
for (unsigned i = 0; i < Bits.size(); ++i)
if (LHSBits[i].isZero())
Bits[i] = RHSBits[i];
else if (RHSBits[i].isZero())
Bits[i] = LHSBits[i];
else {
AllDisjoint = false;
break;
}
if (!AllDisjoint)
break;
return true;
}
}
for (unsigned i = 0; i < Bits.size(); ++i)
Bits[i] = ValueBit(V, i);
return false;
}
void computeRotationAmounts() {
HasZeros = false;
RLAmt.resize(Bits.size());
for (unsigned i = 0; i < Bits.size(); ++i)
if (Bits[i].hasValue()) {
unsigned VBI = Bits[i].getValueBitIndex();
if (i >= VBI)
RLAmt[i] = i - VBI;
else
RLAmt[i] = Bits.size() - (VBI - i);
} else if (Bits[i].isZero()) {
HasZeros = true;
RLAmt[i] = UINT32_MAX;
} else {
llvm_unreachable("Unknown value bit type");
}
}
void collectBitGroups(bool LateMask) {
BitGroups.clear();
unsigned LastRLAmt = RLAmt[0];
SDValue LastValue = Bits[0].hasValue() ? Bits[0].getValue() : SDValue();
unsigned LastGroupStartIdx = 0;
for (unsigned i = 1; i < Bits.size(); ++i) {
unsigned ThisRLAmt = RLAmt[i];
SDValue ThisValue = Bits[i].hasValue() ? Bits[i].getValue() : SDValue();
if (LateMask && !ThisValue) {
ThisValue = LastValue;
ThisRLAmt = LastRLAmt;
if (BitGroups.empty())
LastGroupStartIdx = 0;
}
if (ThisRLAmt == LastRLAmt && ThisValue == LastValue)
continue;
if (LastValue.getNode())
BitGroups.push_back(BitGroup(LastValue, LastRLAmt, LastGroupStartIdx,
i-1));
LastRLAmt = ThisRLAmt;
LastValue = ThisValue;
LastGroupStartIdx = i;
}
if (LastValue.getNode())
BitGroups.push_back(BitGroup(LastValue, LastRLAmt, LastGroupStartIdx,
Bits.size()-1));
if (BitGroups.empty())
return;
if (BitGroups.size() > 1) {
if (BitGroups[0].StartIdx == 0 &&
BitGroups[BitGroups.size()-1].EndIdx == Bits.size()-1 &&
BitGroups[0].V == BitGroups[BitGroups.size()-1].V &&
BitGroups[0].RLAmt == BitGroups[BitGroups.size()-1].RLAmt) {
DEBUG(dbgs() << "\tcombining final bit group with inital one\n");
BitGroups[BitGroups.size()-1].EndIdx = BitGroups[0].EndIdx;
BitGroups.erase(BitGroups.begin());
}
}
}
void collectValueRotInfo() {
ValueRots.clear();
for (auto &BG : BitGroups) {
unsigned RLAmtKey = BG.RLAmt + (BG.Repl32 ? 64 : 0);
ValueRotInfo &VRI = ValueRots[std::make_pair(BG.V, RLAmtKey)];
VRI.V = BG.V;
VRI.RLAmt = BG.RLAmt;
VRI.Repl32 = BG.Repl32;
VRI.NumGroups += 1;
VRI.FirstGroupStartIdx = std::min(VRI.FirstGroupStartIdx, BG.StartIdx);
}
ValueRotsVec.clear();
for (auto &I : ValueRots) {
ValueRotsVec.push_back(I.second);
}
std::sort(ValueRotsVec.begin(), ValueRotsVec.end());
}
void assignRepl32BitGroups() {
auto IsAllLow32 = [this](BitGroup & BG) {
if (BG.StartIdx <= BG.EndIdx) {
for (unsigned i = BG.StartIdx; i <= BG.EndIdx; ++i) {
if (!Bits[i].hasValue())
continue;
if (Bits[i].getValueBitIndex() >= 32)
return false;
}
} else {
for (unsigned i = BG.StartIdx; i < Bits.size(); ++i) {
if (!Bits[i].hasValue())
continue;
if (Bits[i].getValueBitIndex() >= 32)
return false;
}
for (unsigned i = 0; i <= BG.EndIdx; ++i) {
if (!Bits[i].hasValue())
continue;
if (Bits[i].getValueBitIndex() >= 32)
return false;
}
}
return true;
};
for (auto &BG : BitGroups) {
if (BG.StartIdx < 32 && BG.EndIdx < 32) {
if (IsAllLow32(BG)) {
if (BG.RLAmt >= 32) {
BG.RLAmt -= 32;
BG.Repl32CR = true;
}
BG.Repl32 = true;
DEBUG(dbgs() << "\t32-bit replicated bit group for " <<
BG.V.getNode() << " RLAmt = " << BG.RLAmt <<
" [" << BG.StartIdx << ", " << BG.EndIdx << "]\n");
}
}
}
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
auto IP = (I == BitGroups.begin()) ?
std::prev(BitGroups.end()) : std::prev(I);
if (I->Repl32 && IP->Repl32 && I->V == IP->V && I->RLAmt == IP->RLAmt &&
I->StartIdx == (IP->EndIdx + 1) % 64 && I != IP) {
DEBUG(dbgs() << "\tcombining 32-bit replicated bit group for " <<
I->V.getNode() << " RLAmt = " << I->RLAmt <<
" [" << I->StartIdx << ", " << I->EndIdx <<
"] with group with range [" <<
IP->StartIdx << ", " << IP->EndIdx << "]\n");
IP->EndIdx = I->EndIdx;
IP->Repl32CR = IP->Repl32CR || I->Repl32CR;
IP->Repl32Coalesced = true;
I = BitGroups.erase(I);
continue;
} else {
if (I->StartIdx == 32 && I->EndIdx == 63) {
assert(std::next(I) == BitGroups.end() &&
"bit group ends at index 63 but there is another?");
auto IN = BitGroups.begin();
if (IP->Repl32 && IN->Repl32 && I->V == IP->V && I->V == IN->V &&
(I->RLAmt % 32) == IP->RLAmt && (I->RLAmt % 32) == IN->RLAmt &&
IP->EndIdx == 31 && IN->StartIdx == 0 && I != IP &&
IsAllLow32(*I)) {
DEBUG(dbgs() << "\tcombining bit group for " <<
I->V.getNode() << " RLAmt = " << I->RLAmt <<
" [" << I->StartIdx << ", " << I->EndIdx <<
"] with 32-bit replicated groups with ranges [" <<
IP->StartIdx << ", " << IP->EndIdx << "] and [" <<
IN->StartIdx << ", " << IN->EndIdx << "]\n");
if (IP == IN) {
IP->StartIdx = 31;
IP->EndIdx = 30;
IP->Repl32CR = IP->Repl32CR || I->RLAmt >= 32;
IP->Repl32Coalesced = true;
I = BitGroups.erase(I);
} else {
IP->EndIdx = IN->EndIdx;
IP->Repl32CR = IP->Repl32CR || IN->Repl32CR || I->RLAmt >= 32;
IP->Repl32Coalesced = true;
I = BitGroups.erase(I);
BitGroups.erase(BitGroups.begin());
}
break;
}
}
}
++I;
}
}
SDValue getI32Imm(unsigned Imm) {
return CurDAG->getTargetConstant(Imm, MVT::i32);
}
uint64_t getZerosMask() {
uint64_t Mask = 0;
for (unsigned i = 0; i < Bits.size(); ++i) {
if (Bits[i].hasValue())
continue;
Mask |= (UINT64_C(1) << i);
}
return ~Mask;
}
void SelectAndParts32(SDLoc dl, SDValue &Res, unsigned *InstCnt) {
if (BPermRewriterNoMasking)
return;
for (ValueRotInfo &VRI : ValueRotsVec) {
unsigned Mask = 0;
for (unsigned i = 0; i < Bits.size(); ++i) {
if (!Bits[i].hasValue() || Bits[i].getValue() != VRI.V)
continue;
if (RLAmt[i] != VRI.RLAmt)
continue;
Mask |= (1u << i);
}
unsigned ANDIMask = (Mask & UINT16_MAX), ANDISMask = Mask >> 16;
assert((ANDIMask != 0 || ANDISMask != 0) &&
"No set bits in mask for value bit groups");
bool NeedsRotate = VRI.RLAmt != 0;
unsigned NumAndInsts = (unsigned) NeedsRotate +
(unsigned) (ANDIMask != 0) +
(unsigned) (ANDISMask != 0) +
(unsigned) (ANDIMask != 0 && ANDISMask != 0) +
(unsigned) (bool) Res;
DEBUG(dbgs() << "\t\trotation groups for " << VRI.V.getNode() <<
" RL: " << VRI.RLAmt << ":" <<
"\n\t\t\tisel using masking: " << NumAndInsts <<
" using rotates: " << VRI.NumGroups << "\n");
if (NumAndInsts >= VRI.NumGroups)
continue;
DEBUG(dbgs() << "\t\t\t\tusing masking\n");
if (InstCnt) *InstCnt += NumAndInsts;
SDValue VRot;
if (VRI.RLAmt) {
SDValue Ops[] =
{ VRI.V, getI32Imm(VRI.RLAmt), getI32Imm(0), getI32Imm(31) };
VRot = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32,
Ops), 0);
} else {
VRot = VRI.V;
}
SDValue ANDIVal, ANDISVal;
if (ANDIMask != 0)
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo, dl, MVT::i32,
VRot, getI32Imm(ANDIMask)), 0);
if (ANDISMask != 0)
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo, dl, MVT::i32,
VRot, getI32Imm(ANDISMask)), 0);
SDValue TotalVal;
if (!ANDIVal)
TotalVal = ANDISVal;
else if (!ANDISVal)
TotalVal = ANDIVal;
else
TotalVal = SDValue(CurDAG->getMachineNode(PPC::OR, dl, MVT::i32,
ANDIVal, ANDISVal), 0);
if (!Res)
Res = TotalVal;
else
Res = SDValue(CurDAG->getMachineNode(PPC::OR, dl, MVT::i32,
Res, TotalVal), 0);
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
if (I->V == VRI.V && I->RLAmt == VRI.RLAmt)
I = BitGroups.erase(I);
else
++I;
}
}
}
SDNode *Select32(SDNode *N, bool LateMask, unsigned *InstCnt) {
SDLoc dl(N);
SDValue Res;
if (InstCnt) *InstCnt = 0;
SelectAndParts32(dl, Res, InstCnt);
if ((!HasZeros || LateMask) && !Res) {
ValueRotInfo &VRI = ValueRotsVec[0];
if (VRI.RLAmt) {
if (InstCnt) *InstCnt += 1;
SDValue Ops[] =
{ VRI.V, getI32Imm(VRI.RLAmt), getI32Imm(0), getI32Imm(31) };
Res = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
} else {
Res = VRI.V;
}
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
if (I->V == VRI.V && I->RLAmt == VRI.RLAmt)
I = BitGroups.erase(I);
else
++I;
}
}
if (InstCnt) *InstCnt += BitGroups.size();
for (auto &BG : BitGroups) {
if (!Res) {
SDValue Ops[] =
{ BG.V, getI32Imm(BG.RLAmt), getI32Imm(Bits.size() - BG.EndIdx - 1),
getI32Imm(Bits.size() - BG.StartIdx - 1) };
Res = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
} else {
SDValue Ops[] =
{ Res, BG.V, getI32Imm(BG.RLAmt), getI32Imm(Bits.size() - BG.EndIdx - 1),
getI32Imm(Bits.size() - BG.StartIdx - 1) };
Res = SDValue(CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops), 0);
}
}
if (LateMask) {
unsigned Mask = (unsigned) getZerosMask();
unsigned ANDIMask = (Mask & UINT16_MAX), ANDISMask = Mask >> 16;
assert((ANDIMask != 0 || ANDISMask != 0) &&
"No set bits in zeros mask?");
if (InstCnt) *InstCnt += (unsigned) (ANDIMask != 0) +
(unsigned) (ANDISMask != 0) +
(unsigned) (ANDIMask != 0 && ANDISMask != 0);
SDValue ANDIVal, ANDISVal;
if (ANDIMask != 0)
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo, dl, MVT::i32,
Res, getI32Imm(ANDIMask)), 0);
if (ANDISMask != 0)
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo, dl, MVT::i32,
Res, getI32Imm(ANDISMask)), 0);
if (!ANDIVal)
Res = ANDISVal;
else if (!ANDISVal)
Res = ANDIVal;
else
Res = SDValue(CurDAG->getMachineNode(PPC::OR, dl, MVT::i32,
ANDIVal, ANDISVal), 0);
}
return Res.getNode();
}
unsigned SelectRotMask64Count(unsigned RLAmt, bool Repl32,
unsigned MaskStart, unsigned MaskEnd,
bool IsIns) {
unsigned InstMaskStart = 64 - MaskEnd - 1,
InstMaskEnd = 64 - MaskStart - 1;
if (Repl32)
return 1;
if ((!IsIns && (InstMaskEnd == 63 || InstMaskStart == 0)) ||
InstMaskEnd == 63 - RLAmt)
return 1;
return 2;
}
SDValue SelectRotMask64(SDValue V, SDLoc dl, unsigned RLAmt, bool Repl32,
unsigned MaskStart, unsigned MaskEnd,
unsigned *InstCnt = nullptr) {
unsigned InstMaskStart = 64 - MaskEnd - 1,
InstMaskEnd = 64 - MaskStart - 1;
if (InstCnt) *InstCnt += 1;
if (Repl32) {
assert(InstMaskStart >= 32 && "Mask cannot start out of range");
assert(InstMaskEnd >= 32 && "Mask cannot end out of range");
SDValue Ops[] =
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskStart - 32),
getI32Imm(InstMaskEnd - 32) };
return SDValue(CurDAG->getMachineNode(PPC::RLWINM8, dl, MVT::i64,
Ops), 0);
}
if (InstMaskEnd == 63) {
SDValue Ops[] =
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskStart) };
return SDValue(CurDAG->getMachineNode(PPC::RLDICL, dl, MVT::i64, Ops), 0);
}
if (InstMaskStart == 0) {
SDValue Ops[] =
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskEnd) };
return SDValue(CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64, Ops), 0);
}
if (InstMaskEnd == 63 - RLAmt) {
SDValue Ops[] =
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskStart) };
return SDValue(CurDAG->getMachineNode(PPC::RLDIC, dl, MVT::i64, Ops), 0);
}
if (InstCnt) *InstCnt += 1;
unsigned RLAmt2 = MaskStart;
unsigned RLAmt1 = (64 + RLAmt - RLAmt2) % 64;
if (RLAmt1)
V = SelectRotMask64(V, dl, RLAmt1, false, 0, 63);
return SelectRotMask64(V, dl, RLAmt2, false, MaskStart, MaskEnd);
}
SDValue SelectRotMaskIns64(SDValue Base, SDValue V, SDLoc dl, unsigned RLAmt,
bool Repl32, unsigned MaskStart,
unsigned MaskEnd, unsigned *InstCnt = nullptr) {
unsigned InstMaskStart = 64 - MaskEnd - 1,
InstMaskEnd = 64 - MaskStart - 1;
if (InstCnt) *InstCnt += 1;
if (Repl32) {
assert(InstMaskStart >= 32 && "Mask cannot start out of range");
assert(InstMaskEnd >= 32 && "Mask cannot end out of range");
SDValue Ops[] =
{ Base, V, getI32Imm(RLAmt), getI32Imm(InstMaskStart - 32),
getI32Imm(InstMaskEnd - 32) };
return SDValue(CurDAG->getMachineNode(PPC::RLWIMI8, dl, MVT::i64,
Ops), 0);
}
if (InstMaskEnd == 63 - RLAmt) {
SDValue Ops[] =
{ Base, V, getI32Imm(RLAmt), getI32Imm(InstMaskStart) };
return SDValue(CurDAG->getMachineNode(PPC::RLDIMI, dl, MVT::i64, Ops), 0);
}
if (InstCnt) *InstCnt += 1;
unsigned RLAmt2 = MaskStart;
unsigned RLAmt1 = (64 + RLAmt - RLAmt2) % 64;
if (RLAmt1)
V = SelectRotMask64(V, dl, RLAmt1, false, 0, 63);
return SelectRotMaskIns64(Base, V, dl, RLAmt2, false, MaskStart, MaskEnd);
}
void SelectAndParts64(SDLoc dl, SDValue &Res, unsigned *InstCnt) {
if (BPermRewriterNoMasking)
return;
for (ValueRotInfo &VRI : ValueRotsVec) {
uint64_t Mask = 0;
auto MatchingBG = [VRI](BitGroup &BG) {
if (VRI.V != BG.V)
return false;
unsigned EffRLAmt = BG.RLAmt;
if (!VRI.Repl32 && BG.Repl32) {
if (BG.StartIdx < 32 && BG.EndIdx < 32 && BG.StartIdx <= BG.EndIdx &&
!BG.Repl32Coalesced) {
if (BG.Repl32CR)
EffRLAmt += 32;
} else {
return false;
}
} else if (VRI.Repl32 != BG.Repl32) {
return false;
}
if (VRI.RLAmt != EffRLAmt)
return false;
return true;
};
for (auto &BG : BitGroups) {
if (!MatchingBG(BG))
continue;
if (BG.StartIdx <= BG.EndIdx) {
for (unsigned i = BG.StartIdx; i <= BG.EndIdx; ++i)
Mask |= (UINT64_C(1) << i);
} else {
for (unsigned i = BG.StartIdx; i < Bits.size(); ++i)
Mask |= (UINT64_C(1) << i);
for (unsigned i = 0; i <= BG.EndIdx; ++i)
Mask |= (UINT64_C(1) << i);
}
}
bool Use32BitInsts = isUInt<32>(Mask);
unsigned ANDIMask = (Mask & UINT16_MAX),
ANDISMask = (Mask >> 16) & UINT16_MAX;
bool NeedsRotate = VRI.RLAmt || (VRI.Repl32 && !isUInt<32>(Mask));
unsigned NumAndInsts = (unsigned) NeedsRotate +
(unsigned) (bool) Res;
if (Use32BitInsts)
NumAndInsts += (unsigned) (ANDIMask != 0) + (unsigned) (ANDISMask != 0) +
(unsigned) (ANDIMask != 0 && ANDISMask != 0);
else
NumAndInsts += SelectInt64Count(Mask) + 1;
unsigned NumRLInsts = 0;
bool FirstBG = true;
for (auto &BG : BitGroups) {
if (!MatchingBG(BG))
continue;
NumRLInsts +=
SelectRotMask64Count(BG.RLAmt, BG.Repl32, BG.StartIdx, BG.EndIdx,
!FirstBG);
FirstBG = false;
}
DEBUG(dbgs() << "\t\trotation groups for " << VRI.V.getNode() <<
" RL: " << VRI.RLAmt << (VRI.Repl32 ? " (32):" : ":") <<
"\n\t\t\tisel using masking: " << NumAndInsts <<
" using rotates: " << NumRLInsts << "\n");
if (NumAndInsts > NumRLInsts)
continue;
if (Use32BitInsts && NumAndInsts == NumRLInsts)
continue;
DEBUG(dbgs() << "\t\t\t\tusing masking\n");
if (InstCnt) *InstCnt += NumAndInsts;
SDValue VRot;
if (VRI.RLAmt || (VRI.Repl32 && !isUInt<32>(Mask)))
VRot = SelectRotMask64(VRI.V, dl, VRI.RLAmt, VRI.Repl32,
VRI.Repl32 ? 31 : 0, VRI.Repl32 ? 30 : 63);
else
VRot = VRI.V;
SDValue TotalVal;
if (Use32BitInsts) {
assert((ANDIMask != 0 || ANDISMask != 0) &&
"No set bits in mask when using 32-bit ands for 64-bit value");
SDValue ANDIVal, ANDISVal;
if (ANDIMask != 0)
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo8, dl, MVT::i64,
VRot, getI32Imm(ANDIMask)), 0);
if (ANDISMask != 0)
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo8, dl, MVT::i64,
VRot, getI32Imm(ANDISMask)), 0);
if (!ANDIVal)
TotalVal = ANDISVal;
else if (!ANDISVal)
TotalVal = ANDIVal;
else
TotalVal = SDValue(CurDAG->getMachineNode(PPC::OR8, dl, MVT::i64,
ANDIVal, ANDISVal), 0);
} else {
TotalVal = SDValue(SelectInt64(CurDAG, dl, Mask), 0);
TotalVal =
SDValue(CurDAG->getMachineNode(PPC::AND8, dl, MVT::i64,
VRot, TotalVal), 0);
}
if (!Res)
Res = TotalVal;
else
Res = SDValue(CurDAG->getMachineNode(PPC::OR8, dl, MVT::i64,
Res, TotalVal), 0);
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
if (MatchingBG(*I))
I = BitGroups.erase(I);
else
++I;
}
}
}
SDNode *Select64(SDNode *N, bool LateMask, unsigned *InstCnt) {
SDLoc dl(N);
SDValue Res;
if (InstCnt) *InstCnt = 0;
SelectAndParts64(dl, Res, InstCnt);
if ((!HasZeros || LateMask) && !Res) {
unsigned MaxGroupsIdx = 0;
if (!ValueRotsVec[0].Repl32) {
for (unsigned i = 0, ie = ValueRotsVec.size(); i < ie; ++i)
if (ValueRotsVec[i].Repl32) {
if (ValueRotsVec[i].NumGroups > ValueRotsVec[0].NumGroups)
MaxGroupsIdx = i;
break;
}
}
ValueRotInfo &VRI = ValueRotsVec[MaxGroupsIdx];
bool NeedsRotate = false;
if (VRI.RLAmt) {
NeedsRotate = true;
} else if (VRI.Repl32) {
for (auto &BG : BitGroups) {
if (BG.V != VRI.V || BG.RLAmt != VRI.RLAmt ||
BG.Repl32 != VRI.Repl32)
continue;
if (BG.StartIdx < 32 && BG.EndIdx < 32 && BG.StartIdx < BG.EndIdx)
continue;
NeedsRotate = true;
break;
}
}
if (NeedsRotate)
Res = SelectRotMask64(VRI.V, dl, VRI.RLAmt, VRI.Repl32,
VRI.Repl32 ? 31 : 0, VRI.Repl32 ? 30 : 63,
InstCnt);
else
Res = VRI.V;
if (Res)
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
if (I->V == VRI.V && I->RLAmt == VRI.RLAmt && I->Repl32 == VRI.Repl32)
I = BitGroups.erase(I);
else
++I;
}
}
if (!Res)
for (auto I = BitGroups.begin(), IE = BitGroups.end(); I != IE; ++I) {
if (SelectRotMask64Count(I->RLAmt, I->Repl32, I->StartIdx, I->EndIdx,
false) <
SelectRotMask64Count(I->RLAmt, I->Repl32, I->StartIdx, I->EndIdx,
true)) {
if (I != BitGroups.begin()) {
BitGroup BG = *I;
BitGroups.erase(I);
BitGroups.insert(BitGroups.begin(), BG);
}
break;
}
}
for (auto &BG : BitGroups) {
if (!Res)
Res = SelectRotMask64(BG.V, dl, BG.RLAmt, BG.Repl32, BG.StartIdx,
BG.EndIdx, InstCnt);
else
Res = SelectRotMaskIns64(Res, BG.V, dl, BG.RLAmt, BG.Repl32,
BG.StartIdx, BG.EndIdx, InstCnt);
}
if (LateMask) {
uint64_t Mask = getZerosMask();
bool Use32BitInsts = isUInt<32>(Mask);
unsigned ANDIMask = (Mask & UINT16_MAX),
ANDISMask = (Mask >> 16) & UINT16_MAX;
if (Use32BitInsts) {
assert((ANDIMask != 0 || ANDISMask != 0) &&
"No set bits in mask when using 32-bit ands for 64-bit value");
if (InstCnt) *InstCnt += (unsigned) (ANDIMask != 0) +
(unsigned) (ANDISMask != 0) +
(unsigned) (ANDIMask != 0 && ANDISMask != 0);
SDValue ANDIVal, ANDISVal;
if (ANDIMask != 0)
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo8, dl, MVT::i64,
Res, getI32Imm(ANDIMask)), 0);
if (ANDISMask != 0)
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo8, dl, MVT::i64,
Res, getI32Imm(ANDISMask)), 0);
if (!ANDIVal)
Res = ANDISVal;
else if (!ANDISVal)
Res = ANDIVal;
else
Res = SDValue(CurDAG->getMachineNode(PPC::OR8, dl, MVT::i64,
ANDIVal, ANDISVal), 0);
} else {
if (InstCnt) *InstCnt += SelectInt64Count(Mask) + 1;
SDValue MaskVal = SDValue(SelectInt64(CurDAG, dl, Mask), 0);
Res =
SDValue(CurDAG->getMachineNode(PPC::AND8, dl, MVT::i64,
Res, MaskVal), 0);
}
}
return Res.getNode();
}
SDNode *Select(SDNode *N, bool LateMask, unsigned *InstCnt = nullptr) {
collectBitGroups(LateMask);
if (BitGroups.empty())
return nullptr;
if (Bits.size() == 64)
assignRepl32BitGroups();
collectValueRotInfo();
if (Bits.size() == 32) {
return Select32(N, LateMask, InstCnt);
} else {
assert(Bits.size() == 64 && "Not 64 bits here?");
return Select64(N, LateMask, InstCnt);
}
return nullptr;
}
SmallVector<ValueBit, 64> Bits;
bool HasZeros;
SmallVector<unsigned, 64> RLAmt;
SmallVector<BitGroup, 16> BitGroups;
DenseMap<std::pair<SDValue, unsigned>, ValueRotInfo> ValueRots;
SmallVector<ValueRotInfo, 16> ValueRotsVec;
SelectionDAG *CurDAG;
public:
BitPermutationSelector(SelectionDAG *DAG)
: CurDAG(DAG) {}
SDNode *Select(SDNode *N) {
Bits.resize(N->getValueType(0).getSizeInBits());
if (!getValueBits(SDValue(N, 0), Bits))
return nullptr;
DEBUG(dbgs() << "Considering bit-permutation-based instruction"
" selection for: ");
DEBUG(N->dump(CurDAG));
computeRotationAmounts();
if (!HasZeros)
return Select(N, false);
unsigned InstCnt, InstCntLateMask;
DEBUG(dbgs() << "\tEarly masking:\n");
SDNode *RN = Select(N, false, &InstCnt);
DEBUG(dbgs() << "\t\tisel would use " << InstCnt << " instructions\n");
DEBUG(dbgs() << "\tLate masking:\n");
SDNode *RNLM = Select(N, true, &InstCntLateMask);
DEBUG(dbgs() << "\t\tisel would use " << InstCntLateMask <<
" instructions\n");
if (InstCnt <= InstCntLateMask) {
DEBUG(dbgs() << "\tUsing early-masking for isel\n");
return RN;
}
DEBUG(dbgs() << "\tUsing late-masking for isel\n");
return RNLM;
}
};
}
SDNode *PPCDAGToDAGISel::SelectBitPermutation(SDNode *N) {
if (N->getValueType(0) != MVT::i32 &&
N->getValueType(0) != MVT::i64)
return nullptr;
if (!UseBitPermRewriter)
return nullptr;
switch (N->getOpcode()) {
default: break;
case ISD::ROTL:
case ISD::SHL:
case ISD::SRL:
case ISD::AND:
case ISD::OR: {
BitPermutationSelector BPS(CurDAG);
return BPS.Select(N);
}
}
return nullptr;
}
SDValue PPCDAGToDAGISel::SelectCC(SDValue LHS, SDValue RHS,
ISD::CondCode CC, SDLoc dl) {
unsigned Opc;
if (LHS.getValueType() == MVT::i32) {
unsigned Imm;
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
if (isInt32Immediate(RHS, Imm)) {
if (isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
if (isInt<16>((int)Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
SDValue Xor(CurDAG->getMachineNode(PPC::XORIS, dl, MVT::i32, LHS,
getI32Imm(Imm >> 16)), 0);
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, Xor,
getI32Imm(Imm & 0xFFFF)), 0);
}
Opc = PPC::CMPLW;
} else if (ISD::isUnsignedIntSetCC(CC)) {
if (isInt32Immediate(RHS, Imm) && isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
Opc = PPC::CMPLW;
} else {
short SImm;
if (isIntS16Immediate(RHS, SImm))
return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
getI32Imm((int)SImm & 0xFFFF)),
0);
Opc = PPC::CMPW;
}
} else if (LHS.getValueType() == MVT::i64) {
uint64_t Imm;
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
if (isInt64Immediate(RHS.getNode(), Imm)) {
if (isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
if (isInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
getI32Imm(Imm & 0xFFFF)), 0);
if (isUInt<32>(Imm)) {
SDValue Xor(CurDAG->getMachineNode(PPC::XORIS8, dl, MVT::i64, LHS,
getI64Imm(Imm >> 16)), 0);
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, Xor,
getI64Imm(Imm & 0xFFFF)), 0);
}
}
Opc = PPC::CMPLD;
} else if (ISD::isUnsignedIntSetCC(CC)) {
if (isInt64Immediate(RHS.getNode(), Imm) && isUInt<16>(Imm))
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
getI64Imm(Imm & 0xFFFF)), 0);
Opc = PPC::CMPLD;
} else {
short SImm;
if (isIntS16Immediate(RHS, SImm))
return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
getI64Imm(SImm & 0xFFFF)),
0);
Opc = PPC::CMPD;
}
} else if (LHS.getValueType() == MVT::f32) {
Opc = PPC::FCMPUS;
} else {
assert(LHS.getValueType() == MVT::f64 && "Unknown vt!");
Opc = PPCSubTarget->hasVSX() ? PPC::XSCMPUDP : PPC::FCMPUD;
}
return SDValue(CurDAG->getMachineNode(Opc, dl, MVT::i32, LHS, RHS), 0);
}
static PPC::Predicate getPredicateForSetCC(ISD::CondCode CC) {
switch (CC) {
case ISD::SETUEQ:
case ISD::SETONE:
case ISD::SETOLE:
case ISD::SETOGE:
llvm_unreachable("Should be lowered by legalize!");
default: llvm_unreachable("Unknown condition!");
case ISD::SETOEQ:
case ISD::SETEQ: return PPC::PRED_EQ;
case ISD::SETUNE:
case ISD::SETNE: return PPC::PRED_NE;
case ISD::SETOLT:
case ISD::SETLT: return PPC::PRED_LT;
case ISD::SETULE:
case ISD::SETLE: return PPC::PRED_LE;
case ISD::SETOGT:
case ISD::SETGT: return PPC::PRED_GT;
case ISD::SETUGE:
case ISD::SETGE: return PPC::PRED_GE;
case ISD::SETO: return PPC::PRED_NU;
case ISD::SETUO: return PPC::PRED_UN;
case ISD::SETULT: return PPC::PRED_LT;
case ISD::SETUGT: return PPC::PRED_GT;
}
}
static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool &Invert) {
Invert = false;
switch (CC) {
default: llvm_unreachable("Unknown condition!");
case ISD::SETOLT:
case ISD::SETLT: return 0; case ISD::SETOGT:
case ISD::SETGT: return 1; case ISD::SETOEQ:
case ISD::SETEQ: return 2; case ISD::SETUO: return 3; case ISD::SETUGE:
case ISD::SETGE: Invert = true; return 0; case ISD::SETULE:
case ISD::SETLE: Invert = true; return 1; case ISD::SETUNE:
case ISD::SETNE: Invert = true; return 2; case ISD::SETO: Invert = true; return 3; case ISD::SETUEQ:
case ISD::SETOGE:
case ISD::SETOLE:
case ISD::SETONE:
llvm_unreachable("Invalid branch code: should be expanded by legalize");
case ISD::SETULT: return 0;
case ISD::SETUGT: return 1;
}
}
static unsigned int getVCmpInst(MVT VecVT, ISD::CondCode CC,
bool HasVSX, bool &Swap, bool &Negate) {
Swap = false;
Negate = false;
if (VecVT.isFloatingPoint()) {
switch (CC) {
case ISD::SETLE: CC = ISD::SETGE; Swap = true; break;
case ISD::SETLT: CC = ISD::SETGT; Swap = true; break;
case ISD::SETOLE: CC = ISD::SETOGE; Swap = true; break;
case ISD::SETOLT: CC = ISD::SETOGT; Swap = true; break;
case ISD::SETUGE: CC = ISD::SETULE; Swap = true; break;
case ISD::SETUGT: CC = ISD::SETULT; Swap = true; break;
default: break;
}
switch (CC) {
case ISD::SETNE: CC = ISD::SETEQ; Negate = true; break;
case ISD::SETUNE: CC = ISD::SETOEQ; Negate = true; break;
case ISD::SETULE: CC = ISD::SETOGT; Negate = true; break;
case ISD::SETULT: CC = ISD::SETOGE; Negate = true; break;
default: break;
}
switch (CC) {
case ISD::SETEQ:
case ISD::SETOEQ:
if (VecVT == MVT::v4f32)
return HasVSX ? PPC::XVCMPEQSP : PPC::VCMPEQFP;
else if (VecVT == MVT::v2f64)
return PPC::XVCMPEQDP;
break;
case ISD::SETGT:
case ISD::SETOGT:
if (VecVT == MVT::v4f32)
return HasVSX ? PPC::XVCMPGTSP : PPC::VCMPGTFP;
else if (VecVT == MVT::v2f64)
return PPC::XVCMPGTDP;
break;
case ISD::SETGE:
case ISD::SETOGE:
if (VecVT == MVT::v4f32)
return HasVSX ? PPC::XVCMPGESP : PPC::VCMPGEFP;
else if (VecVT == MVT::v2f64)
return PPC::XVCMPGEDP;
break;
default:
break;
}
llvm_unreachable("Invalid floating-point vector compare condition");
} else {
switch (CC) {
case ISD::SETGE: CC = ISD::SETLE; Swap = true; break;
case ISD::SETLT: CC = ISD::SETGT; Swap = true; break;
case ISD::SETUGE: CC = ISD::SETULE; Swap = true; break;
case ISD::SETULT: CC = ISD::SETUGT; Swap = true; break;
default: break;
}
switch (CC) {
case ISD::SETNE: CC = ISD::SETEQ; Negate = true; break;
case ISD::SETUNE: CC = ISD::SETUEQ; Negate = true; break;
case ISD::SETLE: CC = ISD::SETGT; Negate = true; break;
case ISD::SETULE: CC = ISD::SETUGT; Negate = true; break;
default: break;
}
switch (CC) {
case ISD::SETEQ:
case ISD::SETUEQ:
if (VecVT == MVT::v16i8)
return PPC::VCMPEQUB;
else if (VecVT == MVT::v8i16)
return PPC::VCMPEQUH;
else if (VecVT == MVT::v4i32)
return PPC::VCMPEQUW;
else if (VecVT == MVT::v2i64)
return PPC::VCMPEQUD;
break;
case ISD::SETGT:
if (VecVT == MVT::v16i8)
return PPC::VCMPGTSB;
else if (VecVT == MVT::v8i16)
return PPC::VCMPGTSH;
else if (VecVT == MVT::v4i32)
return PPC::VCMPGTSW;
else if (VecVT == MVT::v2i64)
return PPC::VCMPGTSD;
break;
case ISD::SETUGT:
if (VecVT == MVT::v16i8)
return PPC::VCMPGTUB;
else if (VecVT == MVT::v8i16)
return PPC::VCMPGTUH;
else if (VecVT == MVT::v4i32)
return PPC::VCMPGTUW;
else if (VecVT == MVT::v2i64)
return PPC::VCMPGTUD;
break;
default:
break;
}
llvm_unreachable("Invalid integer vector compare condition");
}
}
SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
SDLoc dl(N);
unsigned Imm;
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
bool isPPC64 = (PtrVT == MVT::i64);
if (!PPCSubTarget->useCRBits() &&
isInt32Immediate(N->getOperand(1), Imm)) {
if (Imm == 0) {
SDValue Op = N->getOperand(0);
switch (CC) {
default: break;
case ISD::SETEQ: {
Op = SDValue(CurDAG->getMachineNode(PPC::CNTLZW, dl, MVT::i32, Op), 0);
SDValue Ops[] = { Op, getI32Imm(27), getI32Imm(5), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
case ISD::SETNE: {
if (isPPC64) break;
SDValue AD =
SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
Op, getI32Imm(~0U)), 0);
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op,
AD.getValue(1));
}
case ISD::SETLT: {
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
case ISD::SETGT: {
SDValue T =
SDValue(CurDAG->getMachineNode(PPC::NEG, dl, MVT::i32, Op), 0);
T = SDValue(CurDAG->getMachineNode(PPC::ANDC, dl, MVT::i32, T, Op), 0);
SDValue Ops[] = { T, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
}
} else if (Imm == ~0U) { SDValue Op = N->getOperand(0);
switch (CC) {
default: break;
case ISD::SETEQ:
if (isPPC64) break;
Op = SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
Op, getI32Imm(1)), 0);
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
SDValue(CurDAG->getMachineNode(PPC::LI, dl,
MVT::i32,
getI32Imm(0)), 0),
Op.getValue(1));
case ISD::SETNE: {
if (isPPC64) break;
Op = SDValue(CurDAG->getMachineNode(PPC::NOR, dl, MVT::i32, Op, Op), 0);
SDNode *AD = CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
Op, getI32Imm(~0U));
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDValue(AD, 0),
Op, SDValue(AD, 1));
}
case ISD::SETLT: {
SDValue AD = SDValue(CurDAG->getMachineNode(PPC::ADDI, dl, MVT::i32, Op,
getI32Imm(1)), 0);
SDValue AN = SDValue(CurDAG->getMachineNode(PPC::AND, dl, MVT::i32, AD,
Op), 0);
SDValue Ops[] = { AN, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
case ISD::SETGT: {
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
Op = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops),
0);
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op,
getI32Imm(1));
}
}
}
}
SDValue LHS = N->getOperand(0);
SDValue RHS = N->getOperand(1);
if (LHS.getValueType().isVector()) {
if (PPCSubTarget->hasQPX())
return nullptr;
EVT VecVT = LHS.getValueType();
bool Swap, Negate;
unsigned int VCmpInst = getVCmpInst(VecVT.getSimpleVT(), CC,
PPCSubTarget->hasVSX(), Swap, Negate);
if (Swap)
std::swap(LHS, RHS);
if (Negate) {
SDValue VCmp(CurDAG->getMachineNode(VCmpInst, dl, VecVT, LHS, RHS), 0);
return CurDAG->SelectNodeTo(N, PPCSubTarget->hasVSX() ? PPC::XXLNOR :
PPC::VNOR,
VecVT, VCmp, VCmp);
}
return CurDAG->SelectNodeTo(N, VCmpInst, VecVT, LHS, RHS);
}
if (PPCSubTarget->useCRBits())
return nullptr;
bool Inv;
unsigned Idx = getCRIdxForSetCC(CC, Inv);
SDValue CCReg = SelectCC(LHS, RHS, CC, dl);
SDValue IntCR;
SDValue CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
SDValue InFlag(nullptr, 0); CCReg = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, CR7Reg, CCReg,
InFlag).getValue(1);
IntCR = SDValue(CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32, CR7Reg,
CCReg), 0);
SDValue Ops[] = { IntCR, getI32Imm((32-(3-Idx)) & 31),
getI32Imm(31), getI32Imm(31) };
if (!Inv)
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
SDValue Tmp =
SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
}
SDNode *PPCDAGToDAGISel::transferMemOperands(SDNode *N, SDNode *Result) {
MachineSDNode::mmo_iterator MemOp = MF->allocateMemRefsArray(1);
MemOp[0] = cast<MemSDNode>(N)->getMemOperand();
cast<MachineSDNode>(Result)->setMemRefs(MemOp, MemOp + 1);
return Result;
}
SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
SDLoc dl(N);
if (N->isMachineOpcode()) {
N->setNodeId(-1);
return nullptr; }
if (N->getOpcode() == ISD::ADD &&
N->getOperand(1).getOpcode() == ISD::TargetConstant)
llvm_unreachable("Invalid ADD with TargetConstant operand");
if (SDNode *NN = SelectBitPermutation(N))
return NN;
switch (N->getOpcode()) {
default: break;
case ISD::Constant: {
if (N->getValueType(0) == MVT::i64)
return SelectInt64(CurDAG, N);
break;
}
case ISD::SETCC: {
SDNode *SN = SelectSETCC(N);
if (SN)
return SN;
break;
}
case PPCISD::GlobalBaseReg:
return getGlobalBaseReg();
case ISD::FrameIndex:
return getFrameIndex(N, N);
case PPCISD::MFOCRF: {
SDValue InFlag = N->getOperand(1);
return CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32,
N->getOperand(0), InFlag);
}
case PPCISD::READ_TIME_BASE: {
return CurDAG->getMachineNode(PPC::ReadTB, dl, MVT::i32, MVT::i32,
MVT::Other, N->getOperand(0));
}
case PPCISD::SRA_ADDZE: {
SDValue N0 = N->getOperand(0);
SDValue ShiftAmt =
CurDAG->getTargetConstant(*cast<ConstantSDNode>(N->getOperand(1))->
getConstantIntValue(), N->getValueType(0));
if (N->getValueType(0) == MVT::i64) {
SDNode *Op =
CurDAG->getMachineNode(PPC::SRADI, dl, MVT::i64, MVT::Glue,
N0, ShiftAmt);
return CurDAG->SelectNodeTo(N, PPC::ADDZE8, MVT::i64,
SDValue(Op, 0), SDValue(Op, 1));
} else {
assert(N->getValueType(0) == MVT::i32 &&
"Expecting i64 or i32 in PPCISD::SRA_ADDZE");
SDNode *Op =
CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Glue,
N0, ShiftAmt);
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
SDValue(Op, 0), SDValue(Op, 1));
}
}
case ISD::LOAD: {
LoadSDNode *LD = cast<LoadSDNode>(N);
EVT LoadedVT = LD->getMemoryVT();
if (LD->getAddressingMode() != ISD::PRE_INC)
break;
SDValue Offset = LD->getOffset();
if (Offset.getOpcode() == ISD::TargetConstant ||
Offset.getOpcode() == ISD::TargetGlobalAddress) {
unsigned Opcode;
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
if (LD->getValueType(0) != MVT::i64) {
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::f64: Opcode = PPC::LFDU; break;
case MVT::f32: Opcode = PPC::LFSU; break;
case MVT::i32: Opcode = PPC::LWZU; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAU : PPC::LHZU; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZU; break;
}
} else {
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::i64: Opcode = PPC::LDU; break;
case MVT::i32: Opcode = PPC::LWZU8; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAU8 : PPC::LHZU8; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZU8; break;
}
}
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[] = { Offset, Base, Chain };
return transferMemOperands(N, CurDAG->getMachineNode(Opcode, dl,
LD->getValueType(0),
PPCLowering->getPointerTy(),
MVT::Other, Ops));
} else {
unsigned Opcode;
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
if (LD->getValueType(0) != MVT::i64) {
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::v4f64: Opcode = PPC::QVLFDUX; break; case MVT::v4f32: Opcode = PPC::QVLFSUX; break; case MVT::f64: Opcode = PPC::LFDUX; break;
case MVT::f32: Opcode = PPC::LFSUX; break;
case MVT::i32: Opcode = PPC::LWZUX; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAUX : PPC::LHZUX; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZUX; break;
}
} else {
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
assert((!isSExt || LoadedVT == MVT::i16 || LoadedVT == MVT::i32) &&
"Invalid sext update load");
switch (LoadedVT.getSimpleVT().SimpleTy) {
default: llvm_unreachable("Invalid PPC load type!");
case MVT::i64: Opcode = PPC::LDUX; break;
case MVT::i32: Opcode = isSExt ? PPC::LWAUX : PPC::LWZUX8; break;
case MVT::i16: Opcode = isSExt ? PPC::LHAUX8 : PPC::LHZUX8; break;
case MVT::i1:
case MVT::i8: Opcode = PPC::LBZUX8; break;
}
}
SDValue Chain = LD->getChain();
SDValue Base = LD->getBasePtr();
SDValue Ops[] = { Base, Offset, Chain };
return transferMemOperands(N, CurDAG->getMachineNode(Opcode, dl,
LD->getValueType(0),
PPCLowering->getPointerTy(),
MVT::Other, Ops));
}
}
case ISD::AND: {
unsigned Imm, Imm2, SH, MB, ME;
uint64_t Imm64;
if (isInt32Immediate(N->getOperand(1), Imm) &&
isRotateAndMask(N->getOperand(0).getNode(), Imm, false, SH, MB, ME)) {
SDValue Val = N->getOperand(0).getOperand(0);
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
if (isInt32Immediate(N->getOperand(1), Imm) &&
isRunOfOnes(Imm, MB, ME) &&
N->getOperand(0).getOpcode() != ISD::ROTL) {
SDValue Val = N->getOperand(0);
SDValue Ops[] = { Val, getI32Imm(0), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
if (isInt64Immediate(N->getOperand(1).getNode(), Imm64) &&
isMask_64(Imm64)) {
SDValue Val = N->getOperand(0);
MB = 64 - CountTrailingOnes_64(Imm64);
SH = 0;
if (Val.getOpcode() == ISD::SRL &&
isInt32Immediate(Val.getOperand(1).getNode(), Imm) && Imm <= MB) {
assert(Imm < 64 && "Illegal shift amount");
Val = Val.getOperand(0);
SH = 64 - Imm;
}
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB) };
return CurDAG->SelectNodeTo(N, PPC::RLDICL, MVT::i64, Ops);
}
if (isInt32Immediate(N->getOperand(1), Imm) && (Imm == 0)) {
ReplaceUses(SDValue(N, 0), N->getOperand(1));
return nullptr;
}
if (isInt32Immediate(N->getOperand(1), Imm) &&
N->getOperand(0).getOpcode() == ISD::OR &&
isInt32Immediate(N->getOperand(0).getOperand(1), Imm2)) {
unsigned MB, ME;
Imm = ~(Imm^Imm2);
if (isRunOfOnes(Imm, MB, ME)) {
SDValue Ops[] = { N->getOperand(0).getOperand(0),
N->getOperand(0).getOperand(1),
getI32Imm(0), getI32Imm(MB),getI32Imm(ME) };
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops);
}
}
break;
}
case ISD::OR: {
if (N->getValueType(0) == MVT::i32)
if (SDNode *I = SelectBitfieldInsert(N))
return I;
short Imm;
if (N->getOperand(0)->getOpcode() == ISD::FrameIndex &&
isIntS16Immediate(N->getOperand(1), Imm)) {
APInt LHSKnownZero, LHSKnownOne;
CurDAG->computeKnownBits(N->getOperand(0), LHSKnownZero, LHSKnownOne);
if ((LHSKnownZero.getZExtValue()|~(uint64_t)Imm) == ~0ULL)
return getFrameIndex(N, N->getOperand(0).getNode(), (int)Imm);
}
break;
}
case ISD::ADD: {
short Imm;
if (N->getOperand(0)->getOpcode() == ISD::FrameIndex &&
isIntS16Immediate(N->getOperand(1), Imm))
return getFrameIndex(N, N->getOperand(0).getNode(), (int)Imm);
break;
}
case ISD::SHL: {
unsigned Imm, SH, MB, ME;
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
SDValue Ops[] = { N->getOperand(0).getOperand(0),
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
break;
}
case ISD::SRL: {
unsigned Imm, SH, MB, ME;
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
SDValue Ops[] = { N->getOperand(0).getOperand(0),
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
}
break;
}
case PPCISD::ANDIo_1_EQ_BIT:
case PPCISD::ANDIo_1_GT_BIT: {
if (!ANDIGlueBug)
break;
EVT InVT = N->getOperand(0).getValueType();
assert((InVT == MVT::i64 || InVT == MVT::i32) &&
"Invalid input type for ANDIo_1_EQ_BIT");
unsigned Opcode = (InVT == MVT::i64) ? PPC::ANDIo8 : PPC::ANDIo;
SDValue AndI(CurDAG->getMachineNode(Opcode, dl, InVT, MVT::Glue,
N->getOperand(0),
CurDAG->getTargetConstant(1, InVT)), 0);
SDValue CR0Reg = CurDAG->getRegister(PPC::CR0, MVT::i32);
SDValue SRIdxVal =
CurDAG->getTargetConstant(N->getOpcode() == PPCISD::ANDIo_1_EQ_BIT ?
PPC::sub_eq : PPC::sub_gt, MVT::i32);
return CurDAG->SelectNodeTo(N, TargetOpcode::EXTRACT_SUBREG, MVT::i1,
CR0Reg, SRIdxVal,
SDValue(AndI.getNode(), 1) );
}
case ISD::SELECT_CC: {
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
bool isPPC64 = (PtrVT == MVT::i64);
if (PPCSubTarget->useCRBits() &&
N->getOperand(0).getValueType() == MVT::i1)
break;
if (!isPPC64)
if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
if (N1C->isNullValue() && N3C->isNullValue() &&
N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
N->getValueType(0) == MVT::i32) {
SDNode *Tmp =
CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
N->getOperand(0), getI32Imm(~0U));
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
SDValue(Tmp, 0), N->getOperand(0),
SDValue(Tmp, 1));
}
SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
if (N->getValueType(0) == MVT::i1) {
bool Inv;
unsigned Idx = getCRIdxForSetCC(CC, Inv);
unsigned SRI;
switch (Idx) {
default: llvm_unreachable("Invalid CC index");
case 0: SRI = PPC::sub_lt; break;
case 1: SRI = PPC::sub_gt; break;
case 2: SRI = PPC::sub_eq; break;
case 3: SRI = PPC::sub_un; break;
}
SDValue CCBit = CurDAG->getTargetExtractSubreg(SRI, dl, MVT::i1, CCReg);
SDValue NotCCBit(CurDAG->getMachineNode(PPC::CRNOR, dl, MVT::i1,
CCBit, CCBit), 0);
SDValue C = Inv ? NotCCBit : CCBit,
NotC = Inv ? CCBit : NotCCBit;
SDValue CAndT(CurDAG->getMachineNode(PPC::CRAND, dl, MVT::i1,
C, N->getOperand(2)), 0);
SDValue NotCAndF(CurDAG->getMachineNode(PPC::CRAND, dl, MVT::i1,
NotC, N->getOperand(3)), 0);
return CurDAG->SelectNodeTo(N, PPC::CROR, MVT::i1, CAndT, NotCAndF);
}
unsigned BROpc = getPredicateForSetCC(CC);
unsigned SelectCCOp;
if (N->getValueType(0) == MVT::i32)
SelectCCOp = PPC::SELECT_CC_I4;
else if (N->getValueType(0) == MVT::i64)
SelectCCOp = PPC::SELECT_CC_I8;
else if (N->getValueType(0) == MVT::f32)
SelectCCOp = PPC::SELECT_CC_F4;
else if (N->getValueType(0) == MVT::f64)
if (PPCSubTarget->hasVSX())
SelectCCOp = PPC::SELECT_CC_VSFRC;
else
SelectCCOp = PPC::SELECT_CC_F8;
else if (PPCSubTarget->hasQPX() && N->getValueType(0) == MVT::v4f64)
SelectCCOp = PPC::SELECT_CC_QFRC;
else if (PPCSubTarget->hasQPX() && N->getValueType(0) == MVT::v4f32)
SelectCCOp = PPC::SELECT_CC_QSRC;
else if (PPCSubTarget->hasQPX() && N->getValueType(0) == MVT::v4i1)
SelectCCOp = PPC::SELECT_CC_QBRC;
else if (N->getValueType(0) == MVT::v2f64 ||
N->getValueType(0) == MVT::v2i64)
SelectCCOp = PPC::SELECT_CC_VSRC;
else
SelectCCOp = PPC::SELECT_CC_VRRC;
SDValue Ops[] = { CCReg, N->getOperand(2), N->getOperand(3),
getI32Imm(BROpc) };
return CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), Ops);
}
case ISD::VSELECT:
if (PPCSubTarget->hasVSX()) {
SDValue Ops[] = { N->getOperand(2), N->getOperand(1), N->getOperand(0) };
return CurDAG->SelectNodeTo(N, PPC::XXSEL, N->getValueType(0), Ops);
}
break;
case ISD::VECTOR_SHUFFLE:
if (PPCSubTarget->hasVSX() && (N->getValueType(0) == MVT::v2f64 ||
N->getValueType(0) == MVT::v2i64)) {
ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
SDValue Op1 = N->getOperand(SVN->getMaskElt(0) < 2 ? 0 : 1),
Op2 = N->getOperand(SVN->getMaskElt(1) < 2 ? 0 : 1);
unsigned DM[2];
for (int i = 0; i < 2; ++i)
if (SVN->getMaskElt(i) <= 0 || SVN->getMaskElt(i) == 2)
DM[i] = 0;
else
DM[i] = 1;
if (PPCSubTarget->isLittleEndian()) {
std::swap(Op1, Op2);
unsigned tmp = DM[0];
DM[0] = 1 - DM[1];
DM[1] = 1 - tmp;
}
SDValue DMV = CurDAG->getTargetConstant(DM[1] | (DM[0] << 1), MVT::i32);
if (Op1 == Op2 && DM[0] == 0 && DM[1] == 0 &&
Op1.getOpcode() == ISD::SCALAR_TO_VECTOR &&
isa<LoadSDNode>(Op1.getOperand(0))) {
LoadSDNode *LD = cast<LoadSDNode>(Op1.getOperand(0));
SDValue Base, Offset;
if (LD->isUnindexed() &&
SelectAddrIdxOnly(LD->getBasePtr(), Base, Offset)) {
SDValue Chain = LD->getChain();
SDValue Ops[] = { Base, Offset, Chain };
return CurDAG->SelectNodeTo(N, PPC::LXVDSX,
N->getValueType(0), Ops);
}
}
SDValue Ops[] = { Op1, Op2, DMV };
return CurDAG->SelectNodeTo(N, PPC::XXPERMDI, N->getValueType(0), Ops);
}
break;
case PPCISD::BDNZ:
case PPCISD::BDZ: {
bool IsPPC64 = PPCSubTarget->isPPC64();
SDValue Ops[] = { N->getOperand(1), N->getOperand(0) };
return CurDAG->SelectNodeTo(N, N->getOpcode() == PPCISD::BDNZ ?
(IsPPC64 ? PPC::BDNZ8 : PPC::BDNZ) :
(IsPPC64 ? PPC::BDZ8 : PPC::BDZ),
MVT::Other, Ops);
}
case PPCISD::COND_BRANCH: {
SDValue Pred =
getI32Imm(cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
SDValue Ops[] = { Pred, N->getOperand(2), N->getOperand(3),
N->getOperand(0), N->getOperand(4) };
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops);
}
case ISD::BR_CC: {
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
unsigned PCC = getPredicateForSetCC(CC);
if (N->getOperand(2).getValueType() == MVT::i1) {
unsigned Opc;
bool Swap;
switch (PCC) {
default: llvm_unreachable("Unexpected Boolean-operand predicate");
case PPC::PRED_LT: Opc = PPC::CRANDC; Swap = true; break;
case PPC::PRED_LE: Opc = PPC::CRORC; Swap = true; break;
case PPC::PRED_EQ: Opc = PPC::CREQV; Swap = false; break;
case PPC::PRED_GE: Opc = PPC::CRORC; Swap = false; break;
case PPC::PRED_GT: Opc = PPC::CRANDC; Swap = false; break;
case PPC::PRED_NE: Opc = PPC::CRXOR; Swap = false; break;
}
SDValue BitComp(CurDAG->getMachineNode(Opc, dl, MVT::i1,
N->getOperand(Swap ? 3 : 2),
N->getOperand(Swap ? 2 : 3)), 0);
return CurDAG->SelectNodeTo(N, PPC::BC, MVT::Other,
BitComp, N->getOperand(4), N->getOperand(0));
}
SDValue CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC, dl);
SDValue Ops[] = { getI32Imm(PCC), CondCode,
N->getOperand(4), N->getOperand(0) };
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops);
}
case ISD::BRIND: {
SDValue Chain = N->getOperand(0);
SDValue Target = N->getOperand(1);
unsigned Opc = Target.getValueType() == MVT::i32 ? PPC::MTCTR : PPC::MTCTR8;
unsigned Reg = Target.getValueType() == MVT::i32 ? PPC::BCTR : PPC::BCTR8;
Chain = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Glue, Target,
Chain), 0);
return CurDAG->SelectNodeTo(N, Reg, MVT::Other, Chain);
}
case PPCISD::TOC_ENTRY: {
assert ((PPCSubTarget->isPPC64() || PPCSubTarget->isSVR4ABI()) &&
"Only supported for 64-bit ABI and 32-bit SVR4");
if (PPCSubTarget->isSVR4ABI() && !PPCSubTarget->isPPC64()) {
SDValue GA = N->getOperand(0);
return transferMemOperands(N, CurDAG->getMachineNode(PPC::LWZtoc, dl,
MVT::i32, GA, N->getOperand(1)));
}
CodeModel::Model CModel = TM.getCodeModel();
if (CModel != CodeModel::Medium && CModel != CodeModel::Large)
break;
SDValue GA = N->getOperand(0);
SDValue TOCbase = N->getOperand(1);
SDNode *Tmp = CurDAG->getMachineNode(PPC::ADDIStocHA, dl, MVT::i64,
TOCbase, GA);
if (isa<JumpTableSDNode>(GA) || isa<BlockAddressSDNode>(GA) ||
CModel == CodeModel::Large)
return transferMemOperands(N, CurDAG->getMachineNode(PPC::LDtocL, dl,
MVT::i64, GA, SDValue(Tmp, 0)));
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(GA)) {
const GlobalValue *GValue = G->getGlobal();
if ((GValue->getType()->getElementType()->isFunctionTy() &&
(GValue->isDeclaration() || GValue->isWeakForLinker())) ||
GValue->isDeclaration() || GValue->hasCommonLinkage() ||
GValue->hasAvailableExternallyLinkage())
return transferMemOperands(N, CurDAG->getMachineNode(PPC::LDtocL, dl,
MVT::i64, GA, SDValue(Tmp, 0)));
}
return CurDAG->getMachineNode(PPC::ADDItocL, dl, MVT::i64,
SDValue(Tmp, 0), GA);
}
case PPCISD::PPC32_PICGOT: {
assert(!PPCSubTarget->isPPC64() && PPCSubTarget->isSVR4ABI() &&
"PPCISD::PPC32_PICGOT is only supported for 32-bit SVR4");
return CurDAG->SelectNodeTo(N, PPC::PPC32PICGOT, PPCLowering->getPointerTy(), MVT::i32);
}
case PPCISD::VADD_SPLAT: {
assert(isa<ConstantSDNode>(N->getOperand(0)) &&
isa<ConstantSDNode>(N->getOperand(1)) &&
"Invalid operand on VADD_SPLAT!");
int Elt = N->getConstantOperandVal(0);
int EltSize = N->getConstantOperandVal(1);
unsigned Opc1, Opc2, Opc3;
EVT VT;
if (EltSize == 1) {
Opc1 = PPC::VSPLTISB;
Opc2 = PPC::VADDUBM;
Opc3 = PPC::VSUBUBM;
VT = MVT::v16i8;
} else if (EltSize == 2) {
Opc1 = PPC::VSPLTISH;
Opc2 = PPC::VADDUHM;
Opc3 = PPC::VSUBUHM;
VT = MVT::v8i16;
} else {
assert(EltSize == 4 && "Invalid element size on VADD_SPLAT!");
Opc1 = PPC::VSPLTISW;
Opc2 = PPC::VADDUWM;
Opc3 = PPC::VSUBUWM;
VT = MVT::v4i32;
}
if ((Elt & 1) == 0) {
SDValue EltVal = getI32Imm(Elt >> 1);
SDNode *Tmp = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
SDValue TmpVal = SDValue(Tmp, 0);
return CurDAG->getMachineNode(Opc2, dl, VT, TmpVal, TmpVal);
} else if (Elt > 0) {
SDValue EltVal = getI32Imm(Elt - 16);
SDNode *Tmp1 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
EltVal = getI32Imm(-16);
SDNode *Tmp2 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
return CurDAG->getMachineNode(Opc3, dl, VT, SDValue(Tmp1, 0),
SDValue(Tmp2, 0));
} else {
SDValue EltVal = getI32Imm(Elt + 16);
SDNode *Tmp1 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
EltVal = getI32Imm(-16);
SDNode *Tmp2 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
return CurDAG->getMachineNode(Opc2, dl, VT, SDValue(Tmp1, 0),
SDValue(Tmp2, 0));
}
}
}
return SelectCode(N);
}
SDValue PPCDAGToDAGISel::combineToCMPB(SDNode *N) {
SDLoc dl(N);
assert(N->getOpcode() == ISD::OR &&
"Only OR nodes are supported for CMPB");
SDValue Res;
if (!PPCSubTarget->hasCMPB())
return Res;
if (N->getValueType(0) != MVT::i32 &&
N->getValueType(0) != MVT::i64)
return Res;
EVT VT = N->getValueType(0);
SDValue RHS, LHS;
bool BytesFound[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
uint64_t Mask = 0, Alt = 0;
auto IsByteSelectCC = [this](SDValue O, unsigned &b,
uint64_t &Mask, uint64_t &Alt,
SDValue &LHS, SDValue &RHS) {
if (O.getOpcode() != ISD::SELECT_CC)
return false;
ISD::CondCode CC = cast<CondCodeSDNode>(O.getOperand(4))->get();
if (!isa<ConstantSDNode>(O.getOperand(2)) ||
!isa<ConstantSDNode>(O.getOperand(3)))
return false;
uint64_t PM = O.getConstantOperandVal(2);
uint64_t PAlt = O.getConstantOperandVal(3);
for (b = 0; b < 8; ++b) {
uint64_t Mask = UINT64_C(0xFF) << (8*b);
if (PM && (PM & Mask) == PM && (PAlt & Mask) == PAlt)
break;
}
if (b == 8)
return false;
Mask |= PM;
Alt |= PAlt;
if (!isa<ConstantSDNode>(O.getOperand(1)) ||
O.getConstantOperandVal(1) != 0) {
SDValue Op0 = O.getOperand(0), Op1 = O.getOperand(1);
if (Op0.getOpcode() == ISD::TRUNCATE)
Op0 = Op0.getOperand(0);
if (Op1.getOpcode() == ISD::TRUNCATE)
Op1 = Op1.getOperand(0);
if (Op0.getOpcode() == ISD::SRL && Op1.getOpcode() == ISD::SRL &&
Op0.getOperand(1) == Op1.getOperand(1) && CC == ISD::SETEQ &&
isa<ConstantSDNode>(Op0.getOperand(1))) {
unsigned Bits = Op0.getValueType().getSizeInBits();
if (b != Bits/8-1)
return false;
if (Op0.getConstantOperandVal(1) != Bits-8)
return false;
LHS = Op0.getOperand(0);
RHS = Op1.getOperand(0);
return true;
}
if (Op0.getOpcode() == ISD::XOR && CC == ISD::SETULT &&
isa<ConstantSDNode>(O.getOperand(1))) {
uint64_t ULim = O.getConstantOperandVal(1);
if (ULim != (UINT64_C(1) << b*8))
return false;
unsigned Bits = Op0.getValueType().getSizeInBits();
if (!CurDAG->MaskedValueIsZero(Op0,
APInt::getHighBitsSet(Bits, Bits - (b+1)*8)))
return false;
LHS = Op0.getOperand(0);
RHS = Op0.getOperand(1);
return true;
}
return false;
}
if (CC != ISD::SETEQ)
return false;
SDValue Op = O.getOperand(0);
if (Op.getOpcode() == ISD::AND) {
if (!isa<ConstantSDNode>(Op.getOperand(1)))
return false;
if (Op.getConstantOperandVal(1) != (UINT64_C(0xFF) << (8*b)))
return false;
SDValue XOR = Op.getOperand(0);
if (XOR.getOpcode() == ISD::TRUNCATE)
XOR = XOR.getOperand(0);
if (XOR.getOpcode() != ISD::XOR)
return false;
LHS = XOR.getOperand(0);
RHS = XOR.getOperand(1);
return true;
} else if (Op.getOpcode() == ISD::SRL) {
if (!isa<ConstantSDNode>(Op.getOperand(1)))
return false;
unsigned Bits = Op.getValueType().getSizeInBits();
if (b != Bits/8-1)
return false;
if (Op.getConstantOperandVal(1) != Bits-8)
return false;
SDValue XOR = Op.getOperand(0);
if (XOR.getOpcode() == ISD::TRUNCATE)
XOR = XOR.getOperand(0);
if (XOR.getOpcode() != ISD::XOR)
return false;
LHS = XOR.getOperand(0);
RHS = XOR.getOperand(1);
return true;
}
return false;
};
SmallVector<SDValue, 8> Queue(1, SDValue(N, 0));
while (!Queue.empty()) {
SDValue V = Queue.pop_back_val();
for (const SDValue &O : V.getNode()->ops()) {
unsigned b;
uint64_t M = 0, A = 0;
SDValue OLHS, ORHS;
if (O.getOpcode() == ISD::OR) {
Queue.push_back(O);
} else if (IsByteSelectCC(O, b, M, A, OLHS, ORHS)) {
if (!LHS) {
LHS = OLHS;
RHS = ORHS;
BytesFound[b] = true;
Mask |= M;
Alt |= A;
} else if ((LHS == ORHS && RHS == OLHS) ||
(RHS == ORHS && LHS == OLHS)) {
BytesFound[b] = true;
Mask |= M;
Alt |= A;
} else {
return Res;
}
} else {
return Res;
}
}
}
unsigned LastB = 0, BCnt = 0;
for (unsigned i = 0; i < 8; ++i)
if (BytesFound[LastB]) {
++BCnt;
LastB = i;
}
if (!LastB || BCnt < 2)
return Res;
if (LHS.getValueType() != VT) {
LHS = CurDAG->getAnyExtOrTrunc(LHS, dl, VT);
RHS = CurDAG->getAnyExtOrTrunc(RHS, dl, VT);
}
Res = CurDAG->getNode(PPCISD::CMPB, dl, VT, LHS, RHS);
bool NonTrivialMask = ((int64_t) Mask) != INT64_C(-1);
if (NonTrivialMask && !Alt) {
Res = CurDAG->getNode(ISD::AND, dl, VT, Res, CurDAG->getConstant(Mask, VT));
} else if (Alt) {
Res = CurDAG->getNode(ISD::AND, dl, VT, Res,
CurDAG->getConstant(Mask ^ Alt, VT));
Res = CurDAG->getNode(ISD::XOR, dl, VT, Res, CurDAG->getConstant(Alt, VT));
}
return Res;
}
void PPCDAGToDAGISel::foldBoolExts(SDValue &Res, SDNode *&N) {
if (!PPCSubTarget->useCRBits())
return;
if (N->getOpcode() != ISD::ZERO_EXTEND &&
N->getOpcode() != ISD::SIGN_EXTEND &&
N->getOpcode() != ISD::ANY_EXTEND)
return;
if (N->getOperand(0).getValueType() != MVT::i1)
return;
if (!N->hasOneUse())
return;
SDLoc dl(N);
EVT VT = N->getValueType(0);
SDValue Cond = N->getOperand(0);
SDValue ConstTrue =
CurDAG->getConstant(N->getOpcode() == ISD::SIGN_EXTEND ? -1 : 1, VT);
SDValue ConstFalse = CurDAG->getConstant(0, VT);
do {
SDNode *User = *N->use_begin();
if (User->getNumOperands() != 2)
break;
auto TryFold = [this, N, User](SDValue Val) {
SDValue UserO0 = User->getOperand(0), UserO1 = User->getOperand(1);
SDValue O0 = UserO0.getNode() == N ? Val : UserO0;
SDValue O1 = UserO1.getNode() == N ? Val : UserO1;
return CurDAG->FoldConstantArithmetic(User->getOpcode(),
User->getValueType(0),
O0.getNode(), O1.getNode());
};
SDValue TrueRes = TryFold(ConstTrue);
if (!TrueRes)
break;
SDValue FalseRes = TryFold(ConstFalse);
if (!FalseRes)
break;
uint64_t True = cast<ConstantSDNode>(TrueRes)->getZExtValue(),
False = cast<ConstantSDNode>(FalseRes)->getZExtValue();
if (!isInt<16>(True) || !isInt<16>(False))
break;
Res = CurDAG->getSelect(dl, User->getValueType(0), Cond, TrueRes, FalseRes);
N = User;
ConstTrue = TrueRes;
ConstFalse = FalseRes;
} while (N->hasOneUse());
}
void PPCDAGToDAGISel::PreprocessISelDAG() {
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
bool MadeChange = false;
while (Position != CurDAG->allnodes_begin()) {
SDNode *N = --Position;
if (N->use_empty())
continue;
SDValue Res;
switch (N->getOpcode()) {
default: break;
case ISD::OR:
Res = combineToCMPB(N);
break;
}
if (!Res)
foldBoolExts(Res, N);
if (Res) {
DEBUG(dbgs() << "PPC DAG preprocessing replacing:\nOld: ");
DEBUG(N->dump(CurDAG));
DEBUG(dbgs() << "\nNew: ");
DEBUG(Res.getNode()->dump(CurDAG));
DEBUG(dbgs() << "\n");
CurDAG->ReplaceAllUsesOfValueWith(SDValue(N, 0), Res);
MadeChange = true;
}
}
if (MadeChange)
CurDAG->RemoveDeadNodes();
}
void PPCDAGToDAGISel::PostprocessISelDAG() {
if (TM.getOptLevel() == CodeGenOpt::None)
return;
PeepholePPC64();
PeepholeCROps();
PeepholePPC64ZExt();
}
bool PPCDAGToDAGISel::AllUsersSelectZero(SDNode *N) {
if (!PPCSubTarget->hasISEL())
return false;
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI) {
SDNode *User = *UI;
if (!User->isMachineOpcode())
return false;
if (User->getMachineOpcode() != PPC::SELECT_I4 &&
User->getMachineOpcode() != PPC::SELECT_I8)
return false;
SDNode *Op2 = User->getOperand(2).getNode();
if (!Op2->isMachineOpcode())
return false;
if (Op2->getMachineOpcode() != PPC::LI &&
Op2->getMachineOpcode() != PPC::LI8)
return false;
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op2->getOperand(0));
if (!C)
return false;
if (!C->isNullValue())
return false;
}
return true;
}
void PPCDAGToDAGISel::SwapAllSelectUsers(SDNode *N) {
SmallVector<SDNode *, 4> ToReplace;
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
UI != UE; ++UI) {
SDNode *User = *UI;
assert((User->getMachineOpcode() == PPC::SELECT_I4 ||
User->getMachineOpcode() == PPC::SELECT_I8) &&
"Must have all select users");
ToReplace.push_back(User);
}
for (SmallVector<SDNode *, 4>::iterator UI = ToReplace.begin(),
UE = ToReplace.end(); UI != UE; ++UI) {
SDNode *User = *UI;
SDNode *ResNode =
CurDAG->getMachineNode(User->getMachineOpcode(), SDLoc(User),
User->getValueType(0), User->getOperand(0),
User->getOperand(2),
User->getOperand(1));
DEBUG(dbgs() << "CR Peephole replacing:\nOld: ");
DEBUG(User->dump(CurDAG));
DEBUG(dbgs() << "\nNew: ");
DEBUG(ResNode->dump(CurDAG));
DEBUG(dbgs() << "\n");
ReplaceUses(User, ResNode);
}
}
void PPCDAGToDAGISel::PeepholeCROps() {
bool IsModified;
do {
IsModified = false;
for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
E = CurDAG->allnodes_end(); I != E; ++I) {
MachineSDNode *MachineNode = dyn_cast<MachineSDNode>(I);
if (!MachineNode || MachineNode->use_empty())
continue;
SDNode *ResNode = MachineNode;
bool Op1Set = false, Op1Unset = false,
Op1Not = false,
Op2Set = false, Op2Unset = false,
Op2Not = false;
unsigned Opcode = MachineNode->getMachineOpcode();
switch (Opcode) {
default: break;
case PPC::CRAND:
case PPC::CRNAND:
case PPC::CROR:
case PPC::CRXOR:
case PPC::CRNOR:
case PPC::CREQV:
case PPC::CRANDC:
case PPC::CRORC: {
SDValue Op = MachineNode->getOperand(1);
if (Op.isMachineOpcode()) {
if (Op.getMachineOpcode() == PPC::CRSET)
Op2Set = true;
else if (Op.getMachineOpcode() == PPC::CRUNSET)
Op2Unset = true;
else if (Op.getMachineOpcode() == PPC::CRNOR &&
Op.getOperand(0) == Op.getOperand(1))
Op2Not = true;
}
} case PPC::BC:
case PPC::BCn:
case PPC::SELECT_I4:
case PPC::SELECT_I8:
case PPC::SELECT_F4:
case PPC::SELECT_F8:
case PPC::SELECT_QFRC:
case PPC::SELECT_QSRC:
case PPC::SELECT_QBRC:
case PPC::SELECT_VRRC:
case PPC::SELECT_VSFRC:
case PPC::SELECT_VSRC: {
SDValue Op = MachineNode->getOperand(0);
if (Op.isMachineOpcode()) {
if (Op.getMachineOpcode() == PPC::CRSET)
Op1Set = true;
else if (Op.getMachineOpcode() == PPC::CRUNSET)
Op1Unset = true;
else if (Op.getMachineOpcode() == PPC::CRNOR &&
Op.getOperand(0) == Op.getOperand(1))
Op1Not = true;
}
}
break;
}
bool SelectSwap = false;
switch (Opcode) {
default: break;
case PPC::CRAND:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Set)
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Set)
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Unset || Op2Unset)
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0).
getOperand(0));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRNAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRNAND:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Set)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Set)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Unset || Op2Unset)
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1).
getOperand(0),
MachineNode->getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CROR:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Set || Op2Set)
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Unset)
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Unset)
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0).
getOperand(0));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRXOR:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Set)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Unset)
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Unset)
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRNOR:
if (Op1Set || Op2Set)
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Unset)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Unset)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1).
getOperand(0),
MachineNode->getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CROR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CREQV:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set)
ResNode = MachineNode->getOperand(1).getNode();
else if (Op2Set)
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Unset)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op2Unset)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(0));
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1)),
SelectSwap = true;
break;
case PPC::CRANDC:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op1Unset || Op2Set)
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
MVT::i1);
else if (Op2Unset)
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CRAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0)),
SelectSwap = true;
break;
case PPC::CRORC:
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op1Set || Op2Unset)
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
MVT::i1);
else if (Op2Set)
ResNode = MachineNode->getOperand(0).getNode();
else if (Op1Unset)
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(1));
else if (Op1Not)
ResNode = CurDAG->getMachineNode(PPC::CRNAND, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1));
else if (Op2Not)
ResNode = CurDAG->getMachineNode(PPC::CROR, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(0),
MachineNode->getOperand(1).
getOperand(0));
else if (AllUsersSelectZero(MachineNode))
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
MVT::i1, MachineNode->getOperand(1),
MachineNode->getOperand(0)),
SelectSwap = true;
break;
case PPC::SELECT_I4:
case PPC::SELECT_I8:
case PPC::SELECT_F4:
case PPC::SELECT_F8:
case PPC::SELECT_QFRC:
case PPC::SELECT_QSRC:
case PPC::SELECT_QBRC:
case PPC::SELECT_VRRC:
case PPC::SELECT_VSFRC:
case PPC::SELECT_VSRC:
if (Op1Set)
ResNode = MachineNode->getOperand(1).getNode();
else if (Op1Unset)
ResNode = MachineNode->getOperand(2).getNode();
else if (Op1Not)
ResNode = CurDAG->getMachineNode(MachineNode->getMachineOpcode(),
SDLoc(MachineNode),
MachineNode->getValueType(0),
MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(2),
MachineNode->getOperand(1));
break;
case PPC::BC:
case PPC::BCn:
if (Op1Not)
ResNode = CurDAG->getMachineNode(Opcode == PPC::BC ? PPC::BCn :
PPC::BC,
SDLoc(MachineNode),
MVT::Other,
MachineNode->getOperand(0).
getOperand(0),
MachineNode->getOperand(1),
MachineNode->getOperand(2));
break;
}
if (SelectSwap)
SwapAllSelectUsers(MachineNode);
if (ResNode != MachineNode) {
DEBUG(dbgs() << "CR Peephole replacing:\nOld: ");
DEBUG(MachineNode->dump(CurDAG));
DEBUG(dbgs() << "\nNew: ");
DEBUG(ResNode->dump(CurDAG));
DEBUG(dbgs() << "\n");
ReplaceUses(MachineNode, ResNode);
IsModified = true;
}
}
if (IsModified)
CurDAG->RemoveDeadNodes();
} while (IsModified);
}
static bool PeepholePPC64ZExtGather(SDValue Op32,
SmallPtrSetImpl<SDNode *> &ToPromote) {
if (!Op32.isMachineOpcode())
return false;
if ((Op32.getMachineOpcode() == PPC::RLWINM ||
Op32.getMachineOpcode() == PPC::RLWNM) &&
Op32.getConstantOperandVal(2) <= Op32.getConstantOperandVal(3)) {
ToPromote.insert(Op32.getNode());
return true;
}
if (Op32.getMachineOpcode() == PPC::SLW ||
Op32.getMachineOpcode() == PPC::SRW) {
ToPromote.insert(Op32.getNode());
return true;
}
if (Op32.getMachineOpcode() == PPC::LI ||
Op32.getMachineOpcode() == PPC::LIS) {
if (!isUInt<15>(Op32.getConstantOperandVal(0)))
return false;
ToPromote.insert(Op32.getNode());
return true;
}
if (Op32.getMachineOpcode() == PPC::LHBRX ||
Op32.getMachineOpcode() == PPC::LWBRX) {
ToPromote.insert(Op32.getNode());
return true;
}
if (Op32.getMachineOpcode() == PPC::CNTLZW) {
ToPromote.insert(Op32.getNode());
return true;
}
if (Op32.getMachineOpcode() == PPC::RLWIMI &&
Op32.getConstantOperandVal(3) <= Op32.getConstantOperandVal(4)) {
SmallPtrSet<SDNode *, 16> ToPromote1;
if (!PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1))
return false;
ToPromote.insert(Op32.getNode());
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
return true;
}
if (Op32.getMachineOpcode() == PPC::OR ||
Op32.getMachineOpcode() == PPC::SELECT_I4) {
unsigned B = Op32.getMachineOpcode() == PPC::SELECT_I4 ? 1 : 0;
SmallPtrSet<SDNode *, 16> ToPromote1;
if (!PeepholePPC64ZExtGather(Op32.getOperand(B+0), ToPromote1))
return false;
if (!PeepholePPC64ZExtGather(Op32.getOperand(B+1), ToPromote1))
return false;
ToPromote.insert(Op32.getNode());
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
return true;
}
if (Op32.getMachineOpcode() == PPC::ORI ||
Op32.getMachineOpcode() == PPC::ORIS) {
SmallPtrSet<SDNode *, 16> ToPromote1;
if (!PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1))
return false;
if (!isUInt<15>(Op32.getConstantOperandVal(1)))
return false;
ToPromote.insert(Op32.getNode());
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
return true;
}
if (Op32.getMachineOpcode() == PPC::AND) {
SmallPtrSet<SDNode *, 16> ToPromote1, ToPromote2;
bool Op0OK =
PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1);
bool Op1OK =
PeepholePPC64ZExtGather(Op32.getOperand(1), ToPromote2);
if (!Op0OK && !Op1OK)
return false;
ToPromote.insert(Op32.getNode());
if (Op0OK)
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
if (Op1OK)
ToPromote.insert(ToPromote2.begin(), ToPromote2.end());
return true;
}
if (Op32.getMachineOpcode() == PPC::ANDIo ||
Op32.getMachineOpcode() == PPC::ANDISo) {
SmallPtrSet<SDNode *, 16> ToPromote1;
bool Op0OK =
PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1);
bool Op1OK = isUInt<15>(Op32.getConstantOperandVal(1));
if (!Op0OK && !Op1OK)
return false;
ToPromote.insert(Op32.getNode());
if (Op0OK)
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
return true;
}
return false;
}
void PPCDAGToDAGISel::PeepholePPC64ZExt() {
if (!PPCSubTarget->isPPC64())
return;
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
bool MadeChange = false;
while (Position != CurDAG->allnodes_begin()) {
SDNode *N = --Position;
if (N->use_empty() || !N->isMachineOpcode())
continue;
if (N->getMachineOpcode() != PPC::RLDICL)
continue;
if (N->getConstantOperandVal(1) != 0 ||
N->getConstantOperandVal(2) != 32)
continue;
SDValue ISR = N->getOperand(0);
if (!ISR.isMachineOpcode() ||
ISR.getMachineOpcode() != TargetOpcode::INSERT_SUBREG)
continue;
if (!ISR.hasOneUse())
continue;
if (ISR.getConstantOperandVal(2) != PPC::sub_32)
continue;
SDValue IDef = ISR.getOperand(0);
if (!IDef.isMachineOpcode() ||
IDef.getMachineOpcode() != TargetOpcode::IMPLICIT_DEF)
continue;
SDValue Op32 = ISR->getOperand(1);
if (!Op32.isMachineOpcode())
continue;
SmallPtrSet<SDNode *, 16> ToPromote;
if (!PeepholePPC64ZExtGather(Op32, ToPromote))
continue;
bool OutsideUse = false;
for (SDNode *PN : ToPromote) {
for (SDNode *UN : PN->uses()) {
if (!ToPromote.count(UN) && UN != ISR.getNode()) {
OutsideUse = true;
break;
}
}
if (OutsideUse)
break;
}
if (OutsideUse)
continue;
MadeChange = true;
for (SDNode *PN : ToPromote) {
unsigned NewOpcode;
switch (PN->getMachineOpcode()) {
default:
llvm_unreachable("Don't know the 64-bit variant of this instruction");
case PPC::RLWINM: NewOpcode = PPC::RLWINM8; break;
case PPC::RLWNM: NewOpcode = PPC::RLWNM8; break;
case PPC::SLW: NewOpcode = PPC::SLW8; break;
case PPC::SRW: NewOpcode = PPC::SRW8; break;
case PPC::LI: NewOpcode = PPC::LI8; break;
case PPC::LIS: NewOpcode = PPC::LIS8; break;
case PPC::LHBRX: NewOpcode = PPC::LHBRX8; break;
case PPC::LWBRX: NewOpcode = PPC::LWBRX8; break;
case PPC::CNTLZW: NewOpcode = PPC::CNTLZW8; break;
case PPC::RLWIMI: NewOpcode = PPC::RLWIMI8; break;
case PPC::OR: NewOpcode = PPC::OR8; break;
case PPC::SELECT_I4: NewOpcode = PPC::SELECT_I8; break;
case PPC::ORI: NewOpcode = PPC::ORI8; break;
case PPC::ORIS: NewOpcode = PPC::ORIS8; break;
case PPC::AND: NewOpcode = PPC::AND8; break;
case PPC::ANDIo: NewOpcode = PPC::ANDIo8; break;
case PPC::ANDISo: NewOpcode = PPC::ANDISo8; break;
}
SmallVector<SDValue, 4> Ops;
for (const SDValue &V : PN->ops()) {
if (!ToPromote.count(V.getNode()) && V.getValueType() == MVT::i32 &&
!isa<ConstantSDNode>(V)) {
SDValue ReplOpOps[] = { ISR.getOperand(0), V, ISR.getOperand(2) };
SDNode *ReplOp =
CurDAG->getMachineNode(TargetOpcode::INSERT_SUBREG, SDLoc(V),
ISR.getNode()->getVTList(), ReplOpOps);
Ops.push_back(SDValue(ReplOp, 0));
} else {
Ops.push_back(V);
}
}
SmallVector<EVT, 2> NewVTs;
SDVTList VTs = PN->getVTList();
for (unsigned i = 0, ie = VTs.NumVTs; i != ie; ++i)
if (VTs.VTs[i] == MVT::i32)
NewVTs.push_back(MVT::i64);
else
NewVTs.push_back(VTs.VTs[i]);
DEBUG(dbgs() << "PPC64 ZExt Peephole morphing:\nOld: ");
DEBUG(PN->dump(CurDAG));
CurDAG->SelectNodeTo(PN, NewOpcode, CurDAG->getVTList(NewVTs), Ops);
DEBUG(dbgs() << "\nNew: ");
DEBUG(PN->dump(CurDAG));
DEBUG(dbgs() << "\n");
}
DEBUG(dbgs() << "PPC64 ZExt Peephole replacing:\nOld: ");
DEBUG(N->dump(CurDAG));
DEBUG(dbgs() << "\nNew: ");
DEBUG(Op32.getNode()->dump(CurDAG));
DEBUG(dbgs() << "\n");
ReplaceUses(N, Op32.getNode());
}
if (MadeChange)
CurDAG->RemoveDeadNodes();
}
void PPCDAGToDAGISel::PeepholePPC64() {
if (PPCSubTarget->isDarwin() || !PPCSubTarget->isPPC64())
return;
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
++Position;
while (Position != CurDAG->allnodes_begin()) {
SDNode *N = --Position;
if (N->use_empty() || !N->isMachineOpcode())
continue;
unsigned FirstOp;
unsigned StorageOpcode = N->getMachineOpcode();
switch (StorageOpcode) {
default: continue;
case PPC::LBZ:
case PPC::LBZ8:
case PPC::LD:
case PPC::LFD:
case PPC::LFS:
case PPC::LHA:
case PPC::LHA8:
case PPC::LHZ:
case PPC::LHZ8:
case PPC::LWA:
case PPC::LWZ:
case PPC::LWZ8:
FirstOp = 0;
break;
case PPC::STB:
case PPC::STB8:
case PPC::STD:
case PPC::STFD:
case PPC::STFS:
case PPC::STH:
case PPC::STH8:
case PPC::STW:
case PPC::STW8:
FirstOp = 1;
break;
}
if (!isa<ConstantSDNode>(N->getOperand(FirstOp)) ||
N->getConstantOperandVal(FirstOp) != 0)
continue;
SDValue Base = N->getOperand(FirstOp + 1);
if (!Base.isMachineOpcode())
continue;
unsigned Flags = 0;
bool ReplaceFlags = true;
switch (Base.getMachineOpcode()) {
default: continue;
case PPC::ADDI8:
case PPC::ADDI:
ReplaceFlags = false;
if ((StorageOpcode == PPC::LWA ||
StorageOpcode == PPC::LD ||
StorageOpcode == PPC::STD) &&
(!isa<ConstantSDNode>(Base.getOperand(1)) ||
Base.getConstantOperandVal(1) % 4 != 0))
continue;
break;
case PPC::ADDIdtprelL:
Flags = PPCII::MO_DTPREL_LO;
break;
case PPC::ADDItlsldL:
Flags = PPCII::MO_TLSLD_LO;
break;
case PPC::ADDItocL:
Flags = PPCII::MO_TOC_LO;
break;
}
DEBUG(dbgs() << "Folding add-immediate into mem-op:\nBase: ");
DEBUG(Base->dump(CurDAG));
DEBUG(dbgs() << "\nN: ");
DEBUG(N->dump(CurDAG));
DEBUG(dbgs() << "\n");
SDValue ImmOpnd = Base.getOperand(1);
if (ReplaceFlags) {
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(ImmOpnd)) {
SDLoc dl(GA);
const GlobalValue *GV = GA->getGlobal();
if (GV->getAlignment() < 4 &&
(StorageOpcode == PPC::LD || StorageOpcode == PPC::STD ||
StorageOpcode == PPC::LWA)) {
DEBUG(dbgs() << "Rejected this candidate for alignment.\n\n");
continue;
}
ImmOpnd = CurDAG->getTargetGlobalAddress(GV, dl, MVT::i64, 0, Flags);
} else if (ConstantPoolSDNode *CP =
dyn_cast<ConstantPoolSDNode>(ImmOpnd)) {
const Constant *C = CP->getConstVal();
ImmOpnd = CurDAG->getTargetConstantPool(C, MVT::i64,
CP->getAlignment(),
0, Flags);
}
}
if (FirstOp == 1) (void)CurDAG->UpdateNodeOperands(N, N->getOperand(0), ImmOpnd,
Base.getOperand(0), N->getOperand(3));
else (void)CurDAG->UpdateNodeOperands(N, ImmOpnd, Base.getOperand(0),
N->getOperand(2));
if (Base.getNode()->use_empty())
CurDAG->RemoveDeadNode(Base.getNode());
}
}
FunctionPass *llvm::createPPCISelDag(PPCTargetMachine &TM) {
return new PPCDAGToDAGISel(TM);
}
static void initializePassOnce(PassRegistry &Registry) {
const char *Name = "PowerPC DAG->DAG Pattern Instruction Selection";
PassInfo *PI = new PassInfo(Name, "ppc-codegen", &SelectionDAGISel::ID,
nullptr, false, false);
Registry.registerPass(*PI, true);
}
void llvm::initializePPCDAGToDAGISelPass(PassRegistry &Registry) {
CALL_ONCE_INITIALIZATION(initializePassOnce);
}