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llvm / llvm-project / llvm / refs/heads/main / . / lib / Target / CSKY / CSKYISelLowering.cpp
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//===-- CSKYISelLowering.cpp - CSKY DAG Lowering Implementation ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that CSKY uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#include "CSKYISelLowering.h"
#include "CSKYCallingConv.h"
#include "CSKYConstantPoolValue.h"
#include "CSKYMachineFunctionInfo.h"
#include "CSKYRegisterInfo.h"
#include "CSKYSubtarget.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
#define DEBUG_TYPE "csky-isel-lowering"
STATISTIC(NumTailCalls, "Number of tail calls");
#include "CSKYGenCallingConv.inc"
static const MCPhysReg GPRArgRegs[] = {CSKY::R0, CSKY::R1, CSKY::R2, CSKY::R3};
CSKYTargetLowering::CSKYTargetLowering(const TargetMachine &TM,
const CSKYSubtarget &STI)
: TargetLowering(TM), Subtarget(STI) {
// Register Class
addRegisterClass(MVT::i32, &CSKY::GPRRegClass);
if (STI.useHardFloat()) {
if (STI.hasFPUv2SingleFloat())
addRegisterClass(MVT::f32, &CSKY::sFPR32RegClass);
else if (STI.hasFPUv3SingleFloat())
addRegisterClass(MVT::f32, &CSKY::FPR32RegClass);
if (STI.hasFPUv2DoubleFloat())
addRegisterClass(MVT::f64, &CSKY::sFPR64RegClass);
else if (STI.hasFPUv3DoubleFloat())
addRegisterClass(MVT::f64, &CSKY::FPR64RegClass);
}
setOperationAction(ISD::UADDO_CARRY, MVT::i32, Legal);
setOperationAction(ISD::USUBO_CARRY, MVT::i32, Legal);
setOperationAction(ISD::BITREVERSE, MVT::i32, Legal);
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
setOperationAction(ISD::CTPOP, MVT::i32, Expand);
setOperationAction(ISD::ROTR, MVT::i32, Expand);
setOperationAction(ISD::SHL_PARTS, MVT::i32, Expand);
setOperationAction(ISD::SRL_PARTS, MVT::i32, Expand);
setOperationAction(ISD::SRA_PARTS, MVT::i32, Expand);
setOperationAction(ISD::UMUL_LOHI, MVT::i32, Expand);
setOperationAction(ISD::SMUL_LOHI, MVT::i32, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i32, Expand);
setOperationAction(ISD::BR_CC, MVT::i32, Expand);
setOperationAction(ISD::BR_JT, MVT::Other, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
setOperationAction(ISD::MULHS, MVT::i32, Expand);
setOperationAction(ISD::MULHU, MVT::i32, Expand);
setOperationAction(ISD::VAARG, MVT::Other, Expand);
setOperationAction(ISD::VACOPY, MVT::Other, Expand);
setOperationAction(ISD::VAEND, MVT::Other, Expand);
setLoadExtAction(ISD::EXTLOAD, MVT::i32, MVT::i1, Promote);
setLoadExtAction(ISD::SEXTLOAD, MVT::i32, MVT::i1, Promote);
setLoadExtAction(ISD::ZEXTLOAD, MVT::i32, MVT::i1, Promote);
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::ExternalSymbol, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
if (!Subtarget.hasE2()) {
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
}
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setOperationAction(ISD::VASTART, MVT::Other, Custom);
if (!Subtarget.hasE2()) {
setLoadExtAction(ISD::SEXTLOAD, MVT::i32, MVT::i8, Expand);
setLoadExtAction(ISD::SEXTLOAD, MVT::i32, MVT::i16, Expand);
setOperationAction(ISD::CTLZ, MVT::i32, Expand);
setOperationAction(ISD::BSWAP, MVT::i32, Expand);
}
if (!Subtarget.has2E3()) {
setOperationAction(ISD::ABS, MVT::i32, Expand);
setOperationAction(ISD::BITREVERSE, MVT::i32, Expand);
setOperationAction(ISD::CTTZ, MVT::i32, Expand);
setOperationAction(ISD::SDIV, MVT::i32, Expand);
setOperationAction(ISD::UDIV, MVT::i32, Expand);
}
setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand);
// Float
ISD::CondCode FPCCToExtend[] = {
ISD::SETONE, ISD::SETUEQ, ISD::SETUGT,
ISD::SETUGE, ISD::SETULT, ISD::SETULE,
};
ISD::NodeType FPOpToExpand[] = {
ISD::FSIN, ISD::FCOS, ISD::FSINCOS, ISD::FPOW,
ISD::FREM, ISD::FCOPYSIGN, ISD::FP16_TO_FP, ISD::FP_TO_FP16};
if (STI.useHardFloat()) {
MVT AllVTy[] = {MVT::f32, MVT::f64};
for (auto VT : AllVTy) {
setOperationAction(ISD::FREM, VT, Expand);
setOperationAction(ISD::SELECT_CC, VT, Expand);
setOperationAction(ISD::BR_CC, VT, Expand);
for (auto CC : FPCCToExtend)
setCondCodeAction(CC, VT, Expand);
for (auto Op : FPOpToExpand)
setOperationAction(Op, VT, Expand);
}
if (STI.hasFPUv2SingleFloat() || STI.hasFPUv3SingleFloat()) {
setOperationAction(ISD::ConstantFP, MVT::f32, Legal);
setLoadExtAction(ISD::EXTLOAD, MVT::f32, MVT::f16, Expand);
setTruncStoreAction(MVT::f32, MVT::f16, Expand);
}
if (STI.hasFPUv2DoubleFloat() || STI.hasFPUv3DoubleFloat()) {
setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f32, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
setLoadExtAction(ISD::EXTLOAD, MVT::f64, MVT::f16, Expand);
setTruncStoreAction(MVT::f64, MVT::f16, Expand);
}
}
// Compute derived properties from the register classes.
computeRegisterProperties(STI.getRegisterInfo());
setBooleanContents(UndefinedBooleanContent);
setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
// TODO: Add atomic support fully.
setMaxAtomicSizeInBitsSupported(0);
setStackPointerRegisterToSaveRestore(CSKY::R14);
setMinFunctionAlignment(Align(2));
setSchedulingPreference(Sched::Source);
}
SDValue CSKYTargetLowering::LowerOperation(SDValue Op,
SelectionDAG &DAG) const {
switch (Op.getOpcode()) {
default:
llvm_unreachable("unimplemented op");
case ISD::GlobalAddress:
return LowerGlobalAddress(Op, DAG);
case ISD::ExternalSymbol:
return LowerExternalSymbol(Op, DAG);
case ISD::GlobalTLSAddress:
return LowerGlobalTLSAddress(Op, DAG);
case ISD::JumpTable:
return LowerJumpTable(Op, DAG);
case ISD::BlockAddress:
return LowerBlockAddress(Op, DAG);
case ISD::ConstantPool:
return LowerConstantPool(Op, DAG);
case ISD::VASTART:
return LowerVASTART(Op, DAG);
case ISD::FRAMEADDR:
return LowerFRAMEADDR(Op, DAG);
case ISD::RETURNADDR:
return LowerRETURNADDR(Op, DAG);
}
}
EVT CSKYTargetLowering::getSetCCResultType(const DataLayout &DL,
LLVMContext &Context, EVT VT) const {
if (!VT.isVector())
return MVT::i32;
return VT.changeVectorElementTypeToInteger();
}
static SDValue convertValVTToLocVT(SelectionDAG &DAG, SDValue Val,
const CCValAssign &VA, const SDLoc &DL) {
EVT LocVT = VA.getLocVT();
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unexpected CCValAssign::LocInfo");
case CCValAssign::Full:
break;
case CCValAssign::BCvt:
Val = DAG.getNode(ISD::BITCAST, DL, LocVT, Val);
break;
}
return Val;
}
static SDValue convertLocVTToValVT(SelectionDAG &DAG, SDValue Val,
const CCValAssign &VA, const SDLoc &DL) {
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unexpected CCValAssign::LocInfo");
case CCValAssign::Full:
break;
case CCValAssign::BCvt:
Val = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), Val);
break;
}
return Val;
}
static SDValue unpackFromRegLoc(const CSKYSubtarget &Subtarget,
SelectionDAG &DAG, SDValue Chain,
const CCValAssign &VA, const SDLoc &DL) {
MachineFunction &MF = DAG.getMachineFunction();
MachineRegisterInfo &RegInfo = MF.getRegInfo();
EVT LocVT = VA.getLocVT();
SDValue Val;
const TargetRegisterClass *RC;
switch (LocVT.getSimpleVT().SimpleTy) {
default:
llvm_unreachable("Unexpected register type");
case MVT::i32:
RC = &CSKY::GPRRegClass;
break;
case MVT::f32:
RC = Subtarget.hasFPUv2SingleFloat() ? &CSKY::sFPR32RegClass
: &CSKY::FPR32RegClass;
break;
case MVT::f64:
RC = Subtarget.hasFPUv2DoubleFloat() ? &CSKY::sFPR64RegClass
: &CSKY::FPR64RegClass;
break;
}
Register VReg = RegInfo.createVirtualRegister(RC);
RegInfo.addLiveIn(VA.getLocReg(), VReg);
Val = DAG.getCopyFromReg(Chain, DL, VReg, LocVT);
return convertLocVTToValVT(DAG, Val, VA, DL);
}
static SDValue unpackFromMemLoc(SelectionDAG &DAG, SDValue Chain,
const CCValAssign &VA, const SDLoc &DL) {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo &MFI = MF.getFrameInfo();
EVT LocVT = VA.getLocVT();
EVT ValVT = VA.getValVT();
EVT PtrVT = MVT::getIntegerVT(DAG.getDataLayout().getPointerSizeInBits(0));
int FI = MFI.CreateFixedObject(ValVT.getSizeInBits() / 8,
VA.getLocMemOffset(), /*Immutable=*/true);
SDValue FIN = DAG.getFrameIndex(FI, PtrVT);
SDValue Val;
ISD::LoadExtType ExtType;
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unexpected CCValAssign::LocInfo");
case CCValAssign::Full:
case CCValAssign::BCvt:
ExtType = ISD::NON_EXTLOAD;
break;
}
Val = DAG.getExtLoad(
ExtType, DL, LocVT, Chain, FIN,
MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI), ValVT);
return Val;
}
static SDValue unpack64(SelectionDAG &DAG, SDValue Chain, const CCValAssign &VA,
const SDLoc &DL) {
assert(VA.getLocVT() == MVT::i32 &&
(VA.getValVT() == MVT::f64 || VA.getValVT() == MVT::i64) &&
"Unexpected VA");
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo &MFI = MF.getFrameInfo();
MachineRegisterInfo &RegInfo = MF.getRegInfo();
if (VA.isMemLoc()) {
// f64/i64 is passed on the stack.
int FI = MFI.CreateFixedObject(8, VA.getLocMemOffset(), /*Immutable=*/true);
SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
return DAG.getLoad(VA.getValVT(), DL, Chain, FIN,
MachinePointerInfo::getFixedStack(MF, FI));
}
assert(VA.isRegLoc() && "Expected register VA assignment");
Register LoVReg = RegInfo.createVirtualRegister(&CSKY::GPRRegClass);
RegInfo.addLiveIn(VA.getLocReg(), LoVReg);
SDValue Lo = DAG.getCopyFromReg(Chain, DL, LoVReg, MVT::i32);
SDValue Hi;
if (VA.getLocReg() == CSKY::R3) {
// Second half of f64/i64 is passed on the stack.
int FI = MFI.CreateFixedObject(4, 0, /*Immutable=*/true);
SDValue FIN = DAG.getFrameIndex(FI, MVT::i32);
Hi = DAG.getLoad(MVT::i32, DL, Chain, FIN,
MachinePointerInfo::getFixedStack(MF, FI));
} else {
// Second half of f64/i64 is passed in another GPR.
Register HiVReg = RegInfo.createVirtualRegister(&CSKY::GPRRegClass);
RegInfo.addLiveIn(VA.getLocReg() + 1, HiVReg);
Hi = DAG.getCopyFromReg(Chain, DL, HiVReg, MVT::i32);
}
return DAG.getNode(CSKYISD::BITCAST_FROM_LOHI, DL, VA.getValVT(), Lo, Hi);
}
// Transform physical registers into virtual registers.
SDValue CSKYTargetLowering::LowerFormalArguments(
SDValue Chain, CallingConv::ID CallConv, bool IsVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &DL,
SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const {
switch (CallConv) {
default:
report_fatal_error("Unsupported calling convention");
case CallingConv::C:
case CallingConv::Fast:
break;
}
MachineFunction &MF = DAG.getMachineFunction();
// Used with vargs to acumulate store chains.
std::vector<SDValue> OutChains;
// Assign locations to all of the incoming arguments.
SmallVector<CCValAssign, 16> ArgLocs;
CCState CCInfo(CallConv, IsVarArg, MF, ArgLocs, *DAG.getContext());
CCInfo.AnalyzeFormalArguments(Ins, CCAssignFnForCall(CallConv, IsVarArg));
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
SDValue ArgValue;
bool IsF64OnCSKY = VA.getLocVT() == MVT::i32 && VA.getValVT() == MVT::f64;
if (IsF64OnCSKY)
ArgValue = unpack64(DAG, Chain, VA, DL);
else if (VA.isRegLoc())
ArgValue = unpackFromRegLoc(Subtarget, DAG, Chain, VA, DL);
else
ArgValue = unpackFromMemLoc(DAG, Chain, VA, DL);
InVals.push_back(ArgValue);
}
if (IsVarArg) {
const unsigned XLenInBytes = 4;
const MVT XLenVT = MVT::i32;
ArrayRef<MCPhysReg> ArgRegs = ArrayRef(GPRArgRegs);
unsigned Idx = CCInfo.getFirstUnallocated(ArgRegs);
const TargetRegisterClass *RC = &CSKY::GPRRegClass;
MachineFrameInfo &MFI = MF.getFrameInfo();
MachineRegisterInfo &RegInfo = MF.getRegInfo();
CSKYMachineFunctionInfo *CSKYFI = MF.getInfo<CSKYMachineFunctionInfo>();
// Offset of the first variable argument from stack pointer, and size of
// the vararg save area. For now, the varargs save area is either zero or
// large enough to hold a0-a4.
int VaArgOffset, VarArgsSaveSize;
// If all registers are allocated, then all varargs must be passed on the
// stack and we don't need to save any argregs.
if (ArgRegs.size() == Idx) {
VaArgOffset = CCInfo.getStackSize();
VarArgsSaveSize = 0;
} else {
VarArgsSaveSize = XLenInBytes * (ArgRegs.size() - Idx);
VaArgOffset = -VarArgsSaveSize;
}
// Record the frame index of the first variable argument
// which is a value necessary to VASTART.
int FI = MFI.CreateFixedObject(XLenInBytes, VaArgOffset, true);
CSKYFI->setVarArgsFrameIndex(FI);
// Copy the integer registers that may have been used for passing varargs
// to the vararg save area.
for (unsigned I = Idx; I < ArgRegs.size();
++I, VaArgOffset += XLenInBytes) {
const Register Reg = RegInfo.createVirtualRegister(RC);
RegInfo.addLiveIn(ArgRegs[I], Reg);
SDValue ArgValue = DAG.getCopyFromReg(Chain, DL, Reg, XLenVT);
FI = MFI.CreateFixedObject(XLenInBytes, VaArgOffset, true);
SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
SDValue Store = DAG.getStore(Chain, DL, ArgValue, PtrOff,
MachinePointerInfo::getFixedStack(MF, FI));
cast<StoreSDNode>(Store.getNode())
->getMemOperand()
->setValue((Value *)nullptr);
OutChains.push_back(Store);
}
CSKYFI->setVarArgsSaveSize(VarArgsSaveSize);
}
// All stores are grouped in one node to allow the matching between
// the size of Ins and InVals. This only happens for vararg functions.
if (!OutChains.empty()) {
OutChains.push_back(Chain);
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, OutChains);
}
return Chain;
}
bool CSKYTargetLowering::CanLowerReturn(
CallingConv::ID CallConv, MachineFunction &MF, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs, LLVMContext &Context,
const Type *RetTy) const {
SmallVector<CCValAssign, 16> CSKYLocs;
CCState CCInfo(CallConv, IsVarArg, MF, CSKYLocs, Context);
return CCInfo.CheckReturn(Outs, CCAssignFnForReturn(CallConv, IsVarArg));
}
SDValue
CSKYTargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
const SDLoc &DL, SelectionDAG &DAG) const {
// Stores the assignment of the return value to a location.
SmallVector<CCValAssign, 16> CSKYLocs;
// Info about the registers and stack slot.
CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), CSKYLocs,
*DAG.getContext());
CCInfo.AnalyzeReturn(Outs, CCAssignFnForReturn(CallConv, IsVarArg));
SDValue Glue;
SmallVector<SDValue, 4> RetOps(1, Chain);
// Copy the result values into the output registers.
for (unsigned i = 0, e = CSKYLocs.size(); i < e; ++i) {
SDValue Val = OutVals[i];
CCValAssign &VA = CSKYLocs[i];
assert(VA.isRegLoc() && "Can only return in registers!");
bool IsF64OnCSKY = VA.getLocVT() == MVT::i32 && VA.getValVT() == MVT::f64;
if (IsF64OnCSKY) {
assert(VA.isRegLoc() && "Expected return via registers");
SDValue Split64 = DAG.getNode(CSKYISD::BITCAST_TO_LOHI, DL,
DAG.getVTList(MVT::i32, MVT::i32), Val);
SDValue Lo = Split64.getValue(0);
SDValue Hi = Split64.getValue(1);
Register RegLo = VA.getLocReg();
assert(RegLo < CSKY::R31 && "Invalid register pair");
Register RegHi = RegLo + 1;
Chain = DAG.getCopyToReg(Chain, DL, RegLo, Lo, Glue);
Glue = Chain.getValue(1);
RetOps.push_back(DAG.getRegister(RegLo, MVT::i32));
Chain = DAG.getCopyToReg(Chain, DL, RegHi, Hi, Glue);
Glue = Chain.getValue(1);
RetOps.push_back(DAG.getRegister(RegHi, MVT::i32));
} else {
// Handle a 'normal' return.
Val = convertValVTToLocVT(DAG, Val, VA, DL);
Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), Val, Glue);
// Guarantee that all emitted copies are stuck together.
Glue = Chain.getValue(1);
RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
}
}
RetOps[0] = Chain; // Update chain.
// Add the glue node if we have it.
if (Glue.getNode()) {
RetOps.push_back(Glue);
}
// Interrupt service routines use different return instructions.
if (DAG.getMachineFunction().getFunction().hasFnAttribute("interrupt"))
return DAG.getNode(CSKYISD::NIR, DL, MVT::Other, RetOps);
return DAG.getNode(CSKYISD::RET, DL, MVT::Other, RetOps);
}
// Lower a call to a callseq_start + CALL + callseq_end chain, and add input
// and output parameter nodes.
SDValue CSKYTargetLowering::LowerCall(CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const {
SelectionDAG &DAG = CLI.DAG;
SDLoc &DL = CLI.DL;
SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
SDValue Chain = CLI.Chain;
SDValue Callee = CLI.Callee;
bool &IsTailCall = CLI.IsTailCall;
CallingConv::ID CallConv = CLI.CallConv;
bool IsVarArg = CLI.IsVarArg;
EVT PtrVT = getPointerTy(DAG.getDataLayout());
MVT XLenVT = MVT::i32;
MachineFunction &MF = DAG.getMachineFunction();
// Analyze the operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
CCState ArgCCInfo(CallConv, IsVarArg, MF, ArgLocs, *DAG.getContext());
ArgCCInfo.AnalyzeCallOperands(Outs, CCAssignFnForCall(CallConv, IsVarArg));
// Check if it's really possible to do a tail call.
if (IsTailCall)
IsTailCall = false; // TODO: TailCallOptimization;
if (IsTailCall)
++NumTailCalls;
else if (CLI.CB && CLI.CB->isMustTailCall())
report_fatal_error("failed to perform tail call elimination on a call "
"site marked musttail");
// Get a count of how many bytes are to be pushed on the stack.
unsigned NumBytes = ArgCCInfo.getStackSize();
// Create local copies for byval args
SmallVector<SDValue, 8> ByValArgs;
for (unsigned i = 0, e = Outs.size(); i != e; ++i) {
ISD::ArgFlagsTy Flags = Outs[i].Flags;
if (!Flags.isByVal())
continue;
SDValue Arg = OutVals[i];
unsigned Size = Flags.getByValSize();
Align Alignment = Flags.getNonZeroByValAlign();
int FI =
MF.getFrameInfo().CreateStackObject(Size, Alignment, /*isSS=*/false);
SDValue FIPtr = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
SDValue SizeNode = DAG.getConstant(Size, DL, XLenVT);
Chain = DAG.getMemcpy(Chain, DL, FIPtr, Arg, SizeNode, Alignment,
/*IsVolatile=*/false,
/*AlwaysInline=*/false, /*CI=*/nullptr, IsTailCall,
MachinePointerInfo(), MachinePointerInfo());
ByValArgs.push_back(FIPtr);
}
if (!IsTailCall)
Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, CLI.DL);
// Copy argument values to their designated locations.
SmallVector<std::pair<Register, SDValue>, 8> RegsToPass;
SmallVector<SDValue, 8> MemOpChains;
SDValue StackPtr;
for (unsigned i = 0, j = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
SDValue ArgValue = OutVals[i];
ISD::ArgFlagsTy Flags = Outs[i].Flags;
bool IsF64OnCSKY = VA.getLocVT() == MVT::i32 && VA.getValVT() == MVT::f64;
if (IsF64OnCSKY && VA.isRegLoc()) {
SDValue Split64 =
DAG.getNode(CSKYISD::BITCAST_TO_LOHI, DL,
DAG.getVTList(MVT::i32, MVT::i32), ArgValue);
SDValue Lo = Split64.getValue(0);
SDValue Hi = Split64.getValue(1);
Register RegLo = VA.getLocReg();
RegsToPass.push_back(std::make_pair(RegLo, Lo));
if (RegLo == CSKY::R3) {
// Second half of f64/i64 is passed on the stack.
// Work out the address of the stack slot.
if (!StackPtr.getNode())
StackPtr = DAG.getCopyFromReg(Chain, DL, CSKY::R14, PtrVT);
// Emit the store.
MemOpChains.push_back(
DAG.getStore(Chain, DL, Hi, StackPtr, MachinePointerInfo()));
} else {
// Second half of f64/i64 is passed in another GPR.
assert(RegLo < CSKY::R31 && "Invalid register pair");
Register RegHigh = RegLo + 1;
RegsToPass.push_back(std::make_pair(RegHigh, Hi));
}
continue;
}
ArgValue = convertValVTToLocVT(DAG, ArgValue, VA, DL);
// Use local copy if it is a byval arg.
if (Flags.isByVal())
ArgValue = ByValArgs[j++];
if (VA.isRegLoc()) {
// Queue up the argument copies and emit them at the end.
RegsToPass.push_back(std::make_pair(VA.getLocReg(), ArgValue));
} else {
assert(VA.isMemLoc() && "Argument not register or memory");
assert(!IsTailCall && "Tail call not allowed if stack is used "
"for passing parameters");
// Work out the address of the stack slot.
if (!StackPtr.getNode())
StackPtr = DAG.getCopyFromReg(Chain, DL, CSKY::R14, PtrVT);
SDValue Address =
DAG.getNode(ISD::ADD, DL, PtrVT, StackPtr,
DAG.getIntPtrConstant(VA.getLocMemOffset(), DL));
// Emit the store.
MemOpChains.push_back(
DAG.getStore(Chain, DL, ArgValue, Address, MachinePointerInfo()));
}
}
// Join the stores, which are independent of one another.
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOpChains);
SDValue Glue;
// Build a sequence of copy-to-reg nodes, chained and glued together.
for (auto &Reg : RegsToPass) {
Chain = DAG.getCopyToReg(Chain, DL, Reg.first, Reg.second, Glue);
Glue = Chain.getValue(1);
}
SmallVector<SDValue, 8> Ops;
EVT Ty = getPointerTy(DAG.getDataLayout());
bool IsRegCall = false;
Ops.push_back(Chain);
if (GlobalAddressSDNode *S = dyn_cast<GlobalAddressSDNode>(Callee)) {
const GlobalValue *GV = S->getGlobal();
bool IsLocal = getTargetMachine().shouldAssumeDSOLocal(GV);
if (isPositionIndependent() || !Subtarget.has2E3()) {
IsRegCall = true;
Ops.push_back(getAddr<GlobalAddressSDNode, true>(S, DAG, IsLocal));
} else {
Ops.push_back(getTargetNode(cast<GlobalAddressSDNode>(Callee), DL, Ty,
DAG, CSKYII::MO_None));
Ops.push_back(getTargetConstantPoolValue(
cast<GlobalAddressSDNode>(Callee), Ty, DAG, CSKYII::MO_None));
}
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
bool IsLocal = getTargetMachine().shouldAssumeDSOLocal(nullptr);
if (isPositionIndependent() || !Subtarget.has2E3()) {
IsRegCall = true;
Ops.push_back(getAddr<ExternalSymbolSDNode, true>(S, DAG, IsLocal));
} else {
Ops.push_back(getTargetNode(cast<ExternalSymbolSDNode>(Callee), DL, Ty,
DAG, CSKYII::MO_None));
Ops.push_back(getTargetConstantPoolValue(
cast<ExternalSymbolSDNode>(Callee), Ty, DAG, CSKYII::MO_None));
}
} else {
IsRegCall = true;
Ops.push_back(Callee);
}
// Add argument registers to the end of the list so that they are
// known live into the call.
for (auto &Reg : RegsToPass)
Ops.push_back(DAG.getRegister(Reg.first, Reg.second.getValueType()));
if (!IsTailCall) {
// Add a register mask operand representing the call-preserved registers.
const TargetRegisterInfo *TRI = Subtarget.getRegisterInfo();
const uint32_t *Mask = TRI->getCallPreservedMask(MF, CallConv);
assert(Mask && "Missing call preserved mask for calling convention");
Ops.push_back(DAG.getRegisterMask(Mask));
}
// Glue the call to the argument copies, if any.
if (Glue.getNode())
Ops.push_back(Glue);
// Emit the call.
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
if (IsTailCall) {
MF.getFrameInfo().setHasTailCall();
return DAG.getNode(IsRegCall ? CSKYISD::TAILReg : CSKYISD::TAIL, DL,
NodeTys, Ops);
}
Chain = DAG.getNode(IsRegCall ? CSKYISD::CALLReg : CSKYISD::CALL, DL, NodeTys,
Ops);
DAG.addNoMergeSiteInfo(Chain.getNode(), CLI.NoMerge);
Glue = Chain.getValue(1);
// Mark the end of the call, which is glued to the call itself.
Chain = DAG.getCALLSEQ_END(Chain, NumBytes, 0, Glue, DL);
Glue = Chain.getValue(1);
// Assign locations to each value returned by this call.
SmallVector<CCValAssign, 16> CSKYLocs;
CCState RetCCInfo(CallConv, IsVarArg, MF, CSKYLocs, *DAG.getContext());
RetCCInfo.AnalyzeCallResult(Ins, CCAssignFnForReturn(CallConv, IsVarArg));
// Copy all of the result registers out of their specified physreg.
for (auto &VA : CSKYLocs) {
// Copy the value out
SDValue RetValue =
DAG.getCopyFromReg(Chain, DL, VA.getLocReg(), VA.getLocVT(), Glue);
// Glue the RetValue to the end of the call sequence
Chain = RetValue.getValue(1);
Glue = RetValue.getValue(2);
bool IsF64OnCSKY = VA.getLocVT() == MVT::i32 && VA.getValVT() == MVT::f64;
if (IsF64OnCSKY) {
assert(VA.getLocReg() == GPRArgRegs[0] && "Unexpected reg assignment");
SDValue RetValue2 =
DAG.getCopyFromReg(Chain, DL, GPRArgRegs[1], MVT::i32, Glue);
Chain = RetValue2.getValue(1);
Glue = RetValue2.getValue(2);
RetValue = DAG.getNode(CSKYISD::BITCAST_FROM_LOHI, DL, VA.getValVT(),
RetValue, RetValue2);
}
RetValue = convertLocVTToValVT(DAG, RetValue, VA, DL);
InVals.push_back(RetValue);
}
return Chain;
}
CCAssignFn *CSKYTargetLowering::CCAssignFnForReturn(CallingConv::ID CC,
bool IsVarArg) const {
if (IsVarArg || !Subtarget.useHardFloatABI())
return RetCC_CSKY_ABIV2_SOFT;
else
return RetCC_CSKY_ABIV2_FP;
}
CCAssignFn *CSKYTargetLowering::CCAssignFnForCall(CallingConv::ID CC,
bool IsVarArg) const {
if (IsVarArg || !Subtarget.useHardFloatABI())
return CC_CSKY_ABIV2_SOFT;
else
return CC_CSKY_ABIV2_FP;
}
static CSKYCP::CSKYCPModifier getModifier(unsigned Flags) {
if (Flags == CSKYII::MO_ADDR32)
return CSKYCP::ADDR;
else if (Flags == CSKYII::MO_GOT32)
return CSKYCP::GOT;
else if (Flags == CSKYII::MO_GOTOFF)
return CSKYCP::GOTOFF;
else if (Flags == CSKYII::MO_PLT32)
return CSKYCP::PLT;
else if (Flags == CSKYII::MO_None)
return CSKYCP::NO_MOD;
else
assert(0 && "unknown CSKYII Modifier");
return CSKYCP::NO_MOD;
}
SDValue CSKYTargetLowering::getTargetConstantPoolValue(GlobalAddressSDNode *N,
EVT Ty,
SelectionDAG &DAG,
unsigned Flags) const {
CSKYConstantPoolValue *CPV = CSKYConstantPoolConstant::Create(
N->getGlobal(), CSKYCP::CPValue, 0, getModifier(Flags), false);
return DAG.getTargetConstantPool(CPV, Ty);
}
CSKYTargetLowering::ConstraintType
CSKYTargetLowering::getConstraintType(StringRef Constraint) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default:
break;
case 'a':
case 'b':
case 'v':
case 'w':
case 'y':
return C_RegisterClass;
case 'c':
case 'l':
case 'h':
case 'z':
return C_Register;
}
}
return TargetLowering::getConstraintType(Constraint);
}
std::pair<unsigned, const TargetRegisterClass *>
CSKYTargetLowering::getRegForInlineAsmConstraint(const TargetRegisterInfo *TRI,
StringRef Constraint,
MVT VT) const {
if (Constraint.size() == 1) {
switch (Constraint[0]) {
case 'r':
return std::make_pair(0U, &CSKY::GPRRegClass);
case 'a':
return std::make_pair(0U, &CSKY::mGPRRegClass);
case 'b':
return std::make_pair(0U, &CSKY::sGPRRegClass);
case 'z':
return std::make_pair(CSKY::R14, &CSKY::GPRRegClass);
case 'c':
return std::make_pair(CSKY::C, &CSKY::CARRYRegClass);
case 'w':
if ((Subtarget.hasFPUv2SingleFloat() ||
Subtarget.hasFPUv3SingleFloat()) &&
VT == MVT::f32)
return std::make_pair(0U, &CSKY::sFPR32RegClass);
if ((Subtarget.hasFPUv2DoubleFloat() ||
Subtarget.hasFPUv3DoubleFloat()) &&
VT == MVT::f64)
return std::make_pair(0U, &CSKY::sFPR64RegClass);
break;
case 'v':
if (Subtarget.hasFPUv2SingleFloat() && VT == MVT::f32)
return std::make_pair(0U, &CSKY::sFPR32RegClass);
if (Subtarget.hasFPUv3SingleFloat() && VT == MVT::f32)
return std::make_pair(0U, &CSKY::FPR32RegClass);
if (Subtarget.hasFPUv2DoubleFloat() && VT == MVT::f64)
return std::make_pair(0U, &CSKY::sFPR64RegClass);
if (Subtarget.hasFPUv3DoubleFloat() && VT == MVT::f64)
return std::make_pair(0U, &CSKY::FPR64RegClass);
break;
default:
break;
}
}
if (Constraint == "{c}")
return std::make_pair(CSKY::C, &CSKY::CARRYRegClass);
// Clang will correctly decode the usage of register name aliases into their
// official names. However, other frontends like `rustc` do not. This allows
// users of these frontends to use the ABI names for registers in LLVM-style
// register constraints.
unsigned XRegFromAlias = StringSwitch<unsigned>(Constraint.lower())
.Case("{a0}", CSKY::R0)
.Case("{a1}", CSKY::R1)
.Case("{a2}", CSKY::R2)
.Case("{a3}", CSKY::R3)
.Case("{l0}", CSKY::R4)
.Case("{l1}", CSKY::R5)
.Case("{l2}", CSKY::R6)
.Case("{l3}", CSKY::R7)
.Case("{l4}", CSKY::R8)
.Case("{l5}", CSKY::R9)
.Case("{l6}", CSKY::R10)
.Case("{l7}", CSKY::R11)
.Case("{t0}", CSKY::R12)
.Case("{t1}", CSKY::R13)
.Case("{sp}", CSKY::R14)
.Case("{lr}", CSKY::R15)
.Case("{l8}", CSKY::R16)
.Case("{l9}", CSKY::R17)
.Case("{t2}", CSKY::R18)
.Case("{t3}", CSKY::R19)
.Case("{t4}", CSKY::R20)
.Case("{t5}", CSKY::R21)
.Case("{t6}", CSKY::R22)
.Cases("{t7}", "{fp}", CSKY::R23)
.Cases("{t8}", "{top}", CSKY::R24)
.Cases("{t9}", "{bsp}", CSKY::R25)
.Case("{r26}", CSKY::R26)
.Case("{r27}", CSKY::R27)
.Cases("{gb}", "{rgb}", "{rdb}", CSKY::R28)
.Cases("{tb}", "{rtb}", CSKY::R29)
.Case("{svbr}", CSKY::R30)
.Case("{tls}", CSKY::R31)
.Default(CSKY::NoRegister);
if (XRegFromAlias != CSKY::NoRegister)
return std::make_pair(XRegFromAlias, &CSKY::GPRRegClass);
// Since TargetLowering::getRegForInlineAsmConstraint uses the name of the
// TableGen record rather than the AsmName to choose registers for InlineAsm
// constraints, plus we want to match those names to the widest floating point
// register type available, manually select floating point registers here.
//
// The second case is the ABI name of the register, so that frontends can also
// use the ABI names in register constraint lists.
if (Subtarget.useHardFloat()) {
unsigned FReg = StringSwitch<unsigned>(Constraint.lower())
.Cases("{fr0}", "{vr0}", CSKY::F0_32)
.Cases("{fr1}", "{vr1}", CSKY::F1_32)
.Cases("{fr2}", "{vr2}", CSKY::F2_32)
.Cases("{fr3}", "{vr3}", CSKY::F3_32)
.Cases("{fr4}", "{vr4}", CSKY::F4_32)
.Cases("{fr5}", "{vr5}", CSKY::F5_32)
.Cases("{fr6}", "{vr6}", CSKY::F6_32)
.Cases("{fr7}", "{vr7}", CSKY::F7_32)
.Cases("{fr8}", "{vr8}", CSKY::F8_32)
.Cases("{fr9}", "{vr9}", CSKY::F9_32)
.Cases("{fr10}", "{vr10}", CSKY::F10_32)
.Cases("{fr11}", "{vr11}", CSKY::F11_32)
.Cases("{fr12}", "{vr12}", CSKY::F12_32)
.Cases("{fr13}", "{vr13}", CSKY::F13_32)
.Cases("{fr14}", "{vr14}", CSKY::F14_32)
.Cases("{fr15}", "{vr15}", CSKY::F15_32)
.Cases("{fr16}", "{vr16}", CSKY::F16_32)
.Cases("{fr17}", "{vr17}", CSKY::F17_32)
.Cases("{fr18}", "{vr18}", CSKY::F18_32)
.Cases("{fr19}", "{vr19}", CSKY::F19_32)
.Cases("{fr20}", "{vr20}", CSKY::F20_32)
.Cases("{fr21}", "{vr21}", CSKY::F21_32)
.Cases("{fr22}", "{vr22}", CSKY::F22_32)
.Cases("{fr23}", "{vr23}", CSKY::F23_32)
.Cases("{fr24}", "{vr24}", CSKY::F24_32)
.Cases("{fr25}", "{vr25}", CSKY::F25_32)
.Cases("{fr26}", "{vr26}", CSKY::F26_32)
.Cases("{fr27}", "{vr27}", CSKY::F27_32)
.Cases("{fr28}", "{vr28}", CSKY::F28_32)
.Cases("{fr29}", "{vr29}", CSKY::F29_32)
.Cases("{fr30}", "{vr30}", CSKY::F30_32)
.Cases("{fr31}", "{vr31}", CSKY::F31_32)
.Default(CSKY::NoRegister);
if (FReg != CSKY::NoRegister) {
assert(CSKY::F0_32 <= FReg && FReg <= CSKY::F31_32 && "Unknown fp-reg");
unsigned RegNo = FReg - CSKY::F0_32;
unsigned DReg = CSKY::F0_64 + RegNo;
if (Subtarget.hasFPUv2DoubleFloat())
return std::make_pair(DReg, &CSKY::sFPR64RegClass);
else if (Subtarget.hasFPUv3DoubleFloat())
return std::make_pair(DReg, &CSKY::FPR64RegClass);
else if (Subtarget.hasFPUv2SingleFloat())
return std::make_pair(FReg, &CSKY::sFPR32RegClass);
else if (Subtarget.hasFPUv3SingleFloat())
return std::make_pair(FReg, &CSKY::FPR32RegClass);
}
}
return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
}
static MachineBasicBlock *
emitSelectPseudo(MachineInstr &MI, MachineBasicBlock *BB, unsigned Opcode) {
const TargetInstrInfo &TII = *BB->getParent()->getSubtarget().getInstrInfo();
DebugLoc DL = MI.getDebugLoc();
// To "insert" a SELECT instruction, we actually have to insert the
// diamond control-flow pattern. The incoming instruction knows the
// destination vreg to set, the condition code register to branch on, the
// true/false values to select between, and a branch opcode to use.
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction::iterator It = ++BB->getIterator();
// thisMBB:
// ...
// TrueVal = ...
// bt32 c, sinkMBB
// fallthrough --> copyMBB
MachineBasicBlock *thisMBB = BB;
MachineFunction *F = BB->getParent();
MachineBasicBlock *copyMBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, copyMBB);
F->insert(It, sinkMBB);
// Transfer the remainder of BB and its successor edges to sinkMBB.
sinkMBB->splice(sinkMBB->begin(), BB,
std::next(MachineBasicBlock::iterator(MI)), BB->end());
sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
// Next, add the true and fallthrough blocks as its successors.
BB->addSuccessor(copyMBB);
BB->addSuccessor(sinkMBB);
// bt32 condition, sinkMBB
BuildMI(BB, DL, TII.get(Opcode))
.addReg(MI.getOperand(1).getReg())
.addMBB(sinkMBB);
// copyMBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copyMBB;
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copyMBB ]
// ...
BB = sinkMBB;
BuildMI(*BB, BB->begin(), DL, TII.get(CSKY::PHI), MI.getOperand(0).getReg())
.addReg(MI.getOperand(2).getReg())
.addMBB(thisMBB)
.addReg(MI.getOperand(3).getReg())
.addMBB(copyMBB);
MI.eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
MachineBasicBlock *
CSKYTargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI,
MachineBasicBlock *BB) const {
switch (MI.getOpcode()) {
default:
llvm_unreachable("Unexpected instr type to insert");
case CSKY::FSELS:
case CSKY::FSELD:
if (Subtarget.hasE2())
return emitSelectPseudo(MI, BB, CSKY::BT32);
else
return emitSelectPseudo(MI, BB, CSKY::BT16);
case CSKY::ISEL32:
return emitSelectPseudo(MI, BB, CSKY::BT32);
case CSKY::ISEL16:
return emitSelectPseudo(MI, BB, CSKY::BT16);
}
}
SDValue CSKYTargetLowering::getTargetConstantPoolValue(ExternalSymbolSDNode *N,
EVT Ty,
SelectionDAG &DAG,
unsigned Flags) const {
CSKYConstantPoolValue *CPV =
CSKYConstantPoolSymbol::Create(Type::getInt32Ty(*DAG.getContext()),
N->getSymbol(), 0, getModifier(Flags));
return DAG.getTargetConstantPool(CPV, Ty);
}
SDValue CSKYTargetLowering::getTargetConstantPoolValue(JumpTableSDNode *N,
EVT Ty,
SelectionDAG &DAG,
unsigned Flags) const {
CSKYConstantPoolValue *CPV =
CSKYConstantPoolJT::Create(Type::getInt32Ty(*DAG.getContext()),
N->getIndex(), 0, getModifier(Flags));
return DAG.getTargetConstantPool(CPV, Ty);
}
SDValue CSKYTargetLowering::getTargetConstantPoolValue(BlockAddressSDNode *N,
EVT Ty,
SelectionDAG &DAG,
unsigned Flags) const {
assert(N->getOffset() == 0);
CSKYConstantPoolValue *CPV = CSKYConstantPoolConstant::Create(
N->getBlockAddress(), CSKYCP::CPBlockAddress, 0, getModifier(Flags),
false);
return DAG.getTargetConstantPool(CPV, Ty);
}
SDValue CSKYTargetLowering::getTargetConstantPoolValue(ConstantPoolSDNode *N,
EVT Ty,
SelectionDAG &DAG,
unsigned Flags) const {
assert(N->getOffset() == 0);
CSKYConstantPoolValue *CPV = CSKYConstantPoolConstant::Create(
N->getConstVal(), Type::getInt32Ty(*DAG.getContext()),
CSKYCP::CPConstPool, 0, getModifier(Flags), false);
return DAG.getTargetConstantPool(CPV, Ty);
}
SDValue CSKYTargetLowering::getTargetNode(GlobalAddressSDNode *N, SDLoc DL,
EVT Ty, SelectionDAG &DAG,
unsigned Flags) const {
return DAG.getTargetGlobalAddress(N->getGlobal(), DL, Ty, 0, Flags);
}
SDValue CSKYTargetLowering::getTargetNode(ExternalSymbolSDNode *N, SDLoc DL,
EVT Ty, SelectionDAG &DAG,
unsigned Flags) const {
return DAG.getTargetExternalSymbol(N->getSymbol(), Ty, Flags);
}
SDValue CSKYTargetLowering::getTargetNode(JumpTableSDNode *N, SDLoc DL, EVT Ty,
SelectionDAG &DAG,
unsigned Flags) const {
return DAG.getTargetJumpTable(N->getIndex(), Ty, Flags);
}
SDValue CSKYTargetLowering::getTargetNode(BlockAddressSDNode *N, SDLoc DL,
EVT Ty, SelectionDAG &DAG,
unsigned Flags) const {
return DAG.getTargetBlockAddress(N->getBlockAddress(), Ty, N->getOffset(),
Flags);
}
SDValue CSKYTargetLowering::getTargetNode(ConstantPoolSDNode *N, SDLoc DL,
EVT Ty, SelectionDAG &DAG,
unsigned Flags) const {
return DAG.getTargetConstantPool(N->getConstVal(), Ty, N->getAlign(),
N->getOffset(), Flags);
}
SDValue CSKYTargetLowering::LowerGlobalAddress(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
EVT Ty = Op.getValueType();
GlobalAddressSDNode *N = cast<GlobalAddressSDNode>(Op);
int64_t Offset = N->getOffset();
const GlobalValue *GV = N->getGlobal();
bool IsLocal = getTargetMachine().shouldAssumeDSOLocal(GV);
SDValue Addr = getAddr<GlobalAddressSDNode, false>(N, DAG, IsLocal);
// In order to maximise the opportunity for common subexpression elimination,
// emit a separate ADD node for the global address offset instead of folding
// it in the global address node. Later peephole optimisations may choose to
// fold it back in when profitable.
if (Offset != 0)
return DAG.getNode(ISD::ADD, DL, Ty, Addr,
DAG.getConstant(Offset, DL, MVT::i32));
return Addr;
}
SDValue CSKYTargetLowering::LowerExternalSymbol(SDValue Op,
SelectionDAG &DAG) const {
ExternalSymbolSDNode *N = cast<ExternalSymbolSDNode>(Op);
return getAddr(N, DAG, false);
}
SDValue CSKYTargetLowering::LowerJumpTable(SDValue Op,
SelectionDAG &DAG) const {
JumpTableSDNode *N = cast<JumpTableSDNode>(Op);
return getAddr<JumpTableSDNode, false>(N, DAG);
}
SDValue CSKYTargetLowering::LowerBlockAddress(SDValue Op,
SelectionDAG &DAG) const {
BlockAddressSDNode *N = cast<BlockAddressSDNode>(Op);
return getAddr(N, DAG);
}
SDValue CSKYTargetLowering::LowerConstantPool(SDValue Op,
SelectionDAG &DAG) const {
assert(!Subtarget.hasE2());
ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
return getAddr(N, DAG);
}
SDValue CSKYTargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
CSKYMachineFunctionInfo *FuncInfo = MF.getInfo<CSKYMachineFunctionInfo>();
SDLoc DL(Op);
SDValue FI = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
getPointerTy(MF.getDataLayout()));
// vastart just stores the address of the VarArgsFrameIndex slot into the
// memory location argument.
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
return DAG.getStore(Op.getOperand(0), DL, FI, Op.getOperand(1),
MachinePointerInfo(SV));
}
SDValue CSKYTargetLowering::LowerFRAMEADDR(SDValue Op,
SelectionDAG &DAG) const {
const CSKYRegisterInfo &RI = *Subtarget.getRegisterInfo();
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo &MFI = MF.getFrameInfo();
MFI.setFrameAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc dl(Op);
unsigned Depth = Op.getConstantOperandVal(0);
Register FrameReg = RI.getFrameRegister(MF);
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, FrameReg, VT);
while (Depth--)
FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
MachinePointerInfo());
return FrameAddr;
}
SDValue CSKYTargetLowering::LowerRETURNADDR(SDValue Op,
SelectionDAG &DAG) const {
const CSKYRegisterInfo &RI = *Subtarget.getRegisterInfo();
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo &MFI = MF.getFrameInfo();
MFI.setReturnAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc dl(Op);
unsigned Depth = Op.getConstantOperandVal(0);
if (Depth) {
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
SDValue Offset = DAG.getConstant(4, dl, MVT::i32);
return DAG.getLoad(VT, dl, DAG.getEntryNode(),
DAG.getNode(ISD::ADD, dl, VT, FrameAddr, Offset),
MachinePointerInfo());
}
// Return the value of the return address register, marking it an implicit
// live-in.
unsigned Reg = MF.addLiveIn(RI.getRARegister(), getRegClassFor(MVT::i32));
return DAG.getCopyFromReg(DAG.getEntryNode(), dl, Reg, VT);
}
Register CSKYTargetLowering::getExceptionPointerRegister(
const Constant *PersonalityFn) const {
return CSKY::R0;
}
Register CSKYTargetLowering::getExceptionSelectorRegister(
const Constant *PersonalityFn) const {
return CSKY::R1;
}
SDValue CSKYTargetLowering::LowerGlobalTLSAddress(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
EVT Ty = Op.getValueType();
GlobalAddressSDNode *N = cast<GlobalAddressSDNode>(Op);
int64_t Offset = N->getOffset();
MVT XLenVT = MVT::i32;
TLSModel::Model Model = getTargetMachine().getTLSModel(N->getGlobal());
SDValue Addr;
switch (Model) {
case TLSModel::LocalExec:
Addr = getStaticTLSAddr(N, DAG, /*UseGOT=*/false);
break;
case TLSModel::InitialExec:
Addr = getStaticTLSAddr(N, DAG, /*UseGOT=*/true);
break;
case TLSModel::LocalDynamic:
case TLSModel::GeneralDynamic:
Addr = getDynamicTLSAddr(N, DAG);
break;
}
// In order to maximise the opportunity for common subexpression elimination,
// emit a separate ADD node for the global address offset instead of folding
// it in the global address node. Later peephole optimisations may choose to
// fold it back in when profitable.
if (Offset != 0)
return DAG.getNode(ISD::ADD, DL, Ty, Addr,
DAG.getConstant(Offset, DL, XLenVT));
return Addr;
}
SDValue CSKYTargetLowering::getStaticTLSAddr(GlobalAddressSDNode *N,
SelectionDAG &DAG,
bool UseGOT) const {
MachineFunction &MF = DAG.getMachineFunction();
CSKYMachineFunctionInfo *CFI = MF.getInfo<CSKYMachineFunctionInfo>();
unsigned CSKYPCLabelIndex = CFI->createPICLabelUId();
SDLoc DL(N);
EVT Ty = getPointerTy(DAG.getDataLayout());
CSKYCP::CSKYCPModifier Flag = UseGOT ? CSKYCP::TLSIE : CSKYCP::TLSLE;
bool AddCurrentAddr = UseGOT ? true : false;
unsigned char PCAjust = UseGOT ? 4 : 0;
CSKYConstantPoolValue *CPV =
CSKYConstantPoolConstant::Create(N->getGlobal(), CSKYCP::CPValue, PCAjust,
Flag, AddCurrentAddr, CSKYPCLabelIndex);
SDValue CAddr = DAG.getTargetConstantPool(CPV, Ty);
SDValue Load;
if (UseGOT) {
SDValue PICLabel = DAG.getTargetConstant(CSKYPCLabelIndex, DL, MVT::i32);
auto *LRWGRS = DAG.getMachineNode(CSKY::PseudoTLSLA32, DL, {Ty, Ty},
{CAddr, PICLabel});
auto LRWADDGRS =
DAG.getNode(ISD::ADD, DL, Ty, SDValue(LRWGRS, 0), SDValue(LRWGRS, 1));
Load = DAG.getLoad(Ty, DL, DAG.getEntryNode(), LRWADDGRS,
MachinePointerInfo(N->getGlobal()));
} else {
Load = SDValue(DAG.getMachineNode(CSKY::LRW32, DL, Ty, CAddr), 0);
}
// Add the thread pointer.
SDValue TPReg = DAG.getRegister(CSKY::R31, MVT::i32);
return DAG.getNode(ISD::ADD, DL, Ty, Load, TPReg);
}
SDValue CSKYTargetLowering::getDynamicTLSAddr(GlobalAddressSDNode *N,
SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
CSKYMachineFunctionInfo *CFI = MF.getInfo<CSKYMachineFunctionInfo>();
unsigned CSKYPCLabelIndex = CFI->createPICLabelUId();
SDLoc DL(N);
EVT Ty = getPointerTy(DAG.getDataLayout());
IntegerType *CallTy = Type::getIntNTy(*DAG.getContext(), Ty.getSizeInBits());
CSKYConstantPoolValue *CPV =
CSKYConstantPoolConstant::Create(N->getGlobal(), CSKYCP::CPValue, 4,
CSKYCP::TLSGD, true, CSKYPCLabelIndex);
SDValue Addr = DAG.getTargetConstantPool(CPV, Ty);
SDValue PICLabel = DAG.getTargetConstant(CSKYPCLabelIndex, DL, MVT::i32);
auto *LRWGRS =
DAG.getMachineNode(CSKY::PseudoTLSLA32, DL, {Ty, Ty}, {Addr, PICLabel});
auto Load =
DAG.getNode(ISD::ADD, DL, Ty, SDValue(LRWGRS, 0), SDValue(LRWGRS, 1));
// Prepare argument list to generate call.
ArgListTy Args;
Args.emplace_back(Load, CallTy);
// Setup call to __tls_get_addr.
TargetLowering::CallLoweringInfo CLI(DAG);
CLI.setDebugLoc(DL)
.setChain(DAG.getEntryNode())
.setLibCallee(CallingConv::C, CallTy,
DAG.getExternalSymbol("__tls_get_addr", Ty),
std::move(Args));
SDValue V = LowerCallTo(CLI).first;
return V;
}
bool CSKYTargetLowering::decomposeMulByConstant(LLVMContext &Context, EVT VT,
SDValue C) const {
if (!VT.isScalarInteger())
return false;
// Omit if data size exceeds.
if (VT.getSizeInBits() > Subtarget.XLen)
return false;
if (auto *ConstNode = dyn_cast<ConstantSDNode>(C.getNode())) {
const APInt &Imm = ConstNode->getAPIntValue();
// Break MULT to LSLI + ADDU/SUBU.
if ((Imm + 1).isPowerOf2() || (Imm - 1).isPowerOf2() ||
(1 - Imm).isPowerOf2())
return true;
// Only break MULT for sub targets without MULT32, since an extra
// instruction will be generated against the above 3 cases. We leave it
// unchanged on sub targets with MULT32, since not sure it is better.
if (!Subtarget.hasE2() && (-1 - Imm).isPowerOf2())
return true;
// Break (MULT x, imm) to ([IXH32|IXW32|IXD32] (LSLI32 x, i0), x) when
// imm=(1<<i0)+[2|4|8] and imm has to be composed via a MOVIH32/ORI32 pair.
if (Imm.ugt(0xffff) && ((Imm - 2).isPowerOf2() || (Imm - 4).isPowerOf2()) &&
Subtarget.hasE2())
return true;
if (Imm.ugt(0xffff) && (Imm - 8).isPowerOf2() && Subtarget.has2E3())
return true;
}
return false;
}
bool CSKYTargetLowering::isCheapToSpeculateCttz(Type *Ty) const {
return Subtarget.has2E3();
}
bool CSKYTargetLowering::isCheapToSpeculateCtlz(Type *Ty) const {
return Subtarget.hasE2();
}