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llvm-project/llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp

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//===- llvm/CodeGen/GlobalISel/IRTranslator.cpp - IRTranslator ---*- C++ -*-==//
//
// 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
//
//===----------------------------------------------------------------------===//
/// \file
/// This file implements the IRTranslator class.
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/GlobalISel/IRTranslator.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/BranchProbabilityInfo.h"
#include "llvm/Analysis/OptimizationRemarkEmitter.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/Analysis.h"
#include "llvm/CodeGen/FunctionLoweringInfo.h"
#include "llvm/CodeGen/GlobalISel/CallLowering.h"
#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
#include "llvm/CodeGen/LowLevelType.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/StackProtector.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/CFG.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/MC/MCContext.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/LowLevelTypeImpl.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetIntrinsicInfo.h"
#include "llvm/Target/TargetMachine.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
#include <iterator>
#include <string>
#include <utility>
#include <vector>
#define DEBUG_TYPE "irtranslator"
using namespace llvm;
static cl::opt<bool>
EnableCSEInIRTranslator("enable-cse-in-irtranslator",
cl::desc("Should enable CSE in irtranslator"),
cl::Optional, cl::init(false));
char IRTranslator::ID = 0;
INITIALIZE_PASS_BEGIN(IRTranslator, DEBUG_TYPE, "IRTranslator LLVM IR -> MI",
false, false)
INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
INITIALIZE_PASS_DEPENDENCY(GISelCSEAnalysisWrapperPass)
INITIALIZE_PASS_END(IRTranslator, DEBUG_TYPE, "IRTranslator LLVM IR -> MI",
false, false)
static void reportTranslationError(MachineFunction &MF,
const TargetPassConfig &TPC,
OptimizationRemarkEmitter &ORE,
OptimizationRemarkMissed &R) {
MF.getProperties().set(MachineFunctionProperties::Property::FailedISel);
// Print the function name explicitly if we don't have a debug location (which
// makes the diagnostic less useful) or if we're going to emit a raw error.
if (!R.getLocation().isValid() || TPC.isGlobalISelAbortEnabled())
R << (" (in function: " + MF.getName() + ")").str();
if (TPC.isGlobalISelAbortEnabled())
report_fatal_error(R.getMsg());
else
ORE.emit(R);
}
IRTranslator::IRTranslator() : MachineFunctionPass(ID) { }
#ifndef NDEBUG
namespace {
/// Verify that every instruction created has the same DILocation as the
/// instruction being translated.
class DILocationVerifier : public GISelChangeObserver {
const Instruction *CurrInst = nullptr;
public:
DILocationVerifier() = default;
~DILocationVerifier() = default;
const Instruction *getCurrentInst() const { return CurrInst; }
void setCurrentInst(const Instruction *Inst) { CurrInst = Inst; }
void erasingInstr(MachineInstr &MI) override {}
void changingInstr(MachineInstr &MI) override {}
void changedInstr(MachineInstr &MI) override {}
void createdInstr(MachineInstr &MI) override {
assert(getCurrentInst() && "Inserted instruction without a current MI");
// Only print the check message if we're actually checking it.
#ifndef NDEBUG
LLVM_DEBUG(dbgs() << "Checking DILocation from " << *CurrInst
<< " was copied to " << MI);
#endif
// We allow insts in the entry block to have a debug loc line of 0 because
// they could have originated from constants, and we don't want a jumpy
// debug experience.
assert((CurrInst->getDebugLoc() == MI.getDebugLoc() ||
MI.getDebugLoc().getLine() == 0) &&
"Line info was not transferred to all instructions");
}
};
} // namespace
#endif // ifndef NDEBUG
void IRTranslator::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<StackProtector>();
AU.addRequired<TargetPassConfig>();
AU.addRequired<GISelCSEAnalysisWrapperPass>();
getSelectionDAGFallbackAnalysisUsage(AU);
MachineFunctionPass::getAnalysisUsage(AU);
}
IRTranslator::ValueToVRegInfo::VRegListT &
IRTranslator::allocateVRegs(const Value &Val) {
assert(!VMap.contains(Val) && "Value already allocated in VMap");
auto *Regs = VMap.getVRegs(Val);
auto *Offsets = VMap.getOffsets(Val);
SmallVector<LLT, 4> SplitTys;
computeValueLLTs(*DL, *Val.getType(), SplitTys,
Offsets->empty() ? Offsets : nullptr);
for (unsigned i = 0; i < SplitTys.size(); ++i)
Regs->push_back(0);
return *Regs;
}
ArrayRef<Register> IRTranslator::getOrCreateVRegs(const Value &Val) {
auto VRegsIt = VMap.findVRegs(Val);
if (VRegsIt != VMap.vregs_end())
return *VRegsIt->second;
if (Val.getType()->isVoidTy())
return *VMap.getVRegs(Val);
// Create entry for this type.
auto *VRegs = VMap.getVRegs(Val);
auto *Offsets = VMap.getOffsets(Val);
assert(Val.getType()->isSized() &&
"Don't know how to create an empty vreg");
SmallVector<LLT, 4> SplitTys;
computeValueLLTs(*DL, *Val.getType(), SplitTys,
Offsets->empty() ? Offsets : nullptr);
if (!isa<Constant>(Val)) {
for (auto Ty : SplitTys)
VRegs->push_back(MRI->createGenericVirtualRegister(Ty));
return *VRegs;
}
if (Val.getType()->isAggregateType()) {
// UndefValue, ConstantAggregateZero
auto &C = cast<Constant>(Val);
unsigned Idx = 0;
while (auto Elt = C.getAggregateElement(Idx++)) {
auto EltRegs = getOrCreateVRegs(*Elt);
llvm::copy(EltRegs, std::back_inserter(*VRegs));
}
} else {
assert(SplitTys.size() == 1 && "unexpectedly split LLT");
VRegs->push_back(MRI->createGenericVirtualRegister(SplitTys[0]));
bool Success = translate(cast<Constant>(Val), VRegs->front());
if (!Success) {
OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
MF->getFunction().getSubprogram(),
&MF->getFunction().getEntryBlock());
R << "unable to translate constant: " << ore::NV("Type", Val.getType());
reportTranslationError(*MF, *TPC, *ORE, R);
return *VRegs;
}
}
return *VRegs;
}
int IRTranslator::getOrCreateFrameIndex(const AllocaInst &AI) {
if (FrameIndices.find(&AI) != FrameIndices.end())
return FrameIndices[&AI];
unsigned ElementSize = DL->getTypeAllocSize(AI.getAllocatedType());
unsigned Size =
ElementSize * cast<ConstantInt>(AI.getArraySize())->getZExtValue();
// Always allocate at least one byte.
Size = std::max(Size, 1u);
unsigned Alignment = AI.getAlignment();
if (!Alignment)
Alignment = DL->getABITypeAlignment(AI.getAllocatedType());
int &FI = FrameIndices[&AI];
FI = MF->getFrameInfo().CreateStackObject(Size, Alignment, false, &AI);
return FI;
}
unsigned IRTranslator::getMemOpAlignment(const Instruction &I) {
unsigned Alignment = 0;
Type *ValTy = nullptr;
if (const StoreInst *SI = dyn_cast<StoreInst>(&I)) {
Alignment = SI->getAlignment();
ValTy = SI->getValueOperand()->getType();
} else if (const LoadInst *LI = dyn_cast<LoadInst>(&I)) {
Alignment = LI->getAlignment();
ValTy = LI->getType();
} else if (const AtomicCmpXchgInst *AI = dyn_cast<AtomicCmpXchgInst>(&I)) {
// TODO(PR27168): This instruction has no alignment attribute, but unlike
// the default alignment for load/store, the default here is to assume
// it has NATURAL alignment, not DataLayout-specified alignment.
const DataLayout &DL = AI->getModule()->getDataLayout();
Alignment = DL.getTypeStoreSize(AI->getCompareOperand()->getType());
ValTy = AI->getCompareOperand()->getType();
} else if (const AtomicRMWInst *AI = dyn_cast<AtomicRMWInst>(&I)) {
// TODO(PR27168): This instruction has no alignment attribute, but unlike
// the default alignment for load/store, the default here is to assume
// it has NATURAL alignment, not DataLayout-specified alignment.
const DataLayout &DL = AI->getModule()->getDataLayout();
Alignment = DL.getTypeStoreSize(AI->getValOperand()->getType());
ValTy = AI->getType();
} else {
OptimizationRemarkMissed R("gisel-irtranslator", "", &I);
R << "unable to translate memop: " << ore::NV("Opcode", &I);
reportTranslationError(*MF, *TPC, *ORE, R);
return 1;
}
return Alignment ? Alignment : DL->getABITypeAlignment(ValTy);
}
MachineBasicBlock &IRTranslator::getMBB(const BasicBlock &BB) {
MachineBasicBlock *&MBB = BBToMBB[&BB];
assert(MBB && "BasicBlock was not encountered before");
return *MBB;
}
void IRTranslator::addMachineCFGPred(CFGEdge Edge, MachineBasicBlock *NewPred) {
assert(NewPred && "new predecessor must be a real MachineBasicBlock");
MachinePreds[Edge].push_back(NewPred);
}
bool IRTranslator::translateBinaryOp(unsigned Opcode, const User &U,
MachineIRBuilder &MIRBuilder) {
// Get or create a virtual register for each value.
// Unless the value is a Constant => loadimm cst?
// or inline constant each time?
// Creation of a virtual register needs to have a size.
Register Op0 = getOrCreateVReg(*U.getOperand(0));
Register Op1 = getOrCreateVReg(*U.getOperand(1));
Register Res = getOrCreateVReg(U);
uint16_t Flags = 0;
if (isa<Instruction>(U)) {
const Instruction &I = cast<Instruction>(U);
Flags = MachineInstr::copyFlagsFromInstruction(I);
}
MIRBuilder.buildInstr(Opcode, {Res}, {Op0, Op1}, Flags);
return true;
}
bool IRTranslator::translateFSub(const User &U, MachineIRBuilder &MIRBuilder) {
// -0.0 - X --> G_FNEG
if (isa<Constant>(U.getOperand(0)) &&
U.getOperand(0) == ConstantFP::getZeroValueForNegation(U.getType())) {
Register Op1 = getOrCreateVReg(*U.getOperand(1));
Register Res = getOrCreateVReg(U);
uint16_t Flags = 0;
if (isa<Instruction>(U)) {
const Instruction &I = cast<Instruction>(U);
Flags = MachineInstr::copyFlagsFromInstruction(I);
}
// Negate the last operand of the FSUB
MIRBuilder.buildInstr(TargetOpcode::G_FNEG, {Res}, {Op1}, Flags);
return true;
}
return translateBinaryOp(TargetOpcode::G_FSUB, U, MIRBuilder);
}
bool IRTranslator::translateFNeg(const User &U, MachineIRBuilder &MIRBuilder) {
Register Op0 = getOrCreateVReg(*U.getOperand(0));
Register Res = getOrCreateVReg(U);
uint16_t Flags = 0;
if (isa<Instruction>(U)) {
const Instruction &I = cast<Instruction>(U);
Flags = MachineInstr::copyFlagsFromInstruction(I);
}
MIRBuilder.buildInstr(TargetOpcode::G_FNEG, {Res}, {Op0}, Flags);
return true;
}
bool IRTranslator::translateCompare(const User &U,
MachineIRBuilder &MIRBuilder) {
const CmpInst *CI = dyn_cast<CmpInst>(&U);
Register Op0 = getOrCreateVReg(*U.getOperand(0));
Register Op1 = getOrCreateVReg(*U.getOperand(1));
Register Res = getOrCreateVReg(U);
CmpInst::Predicate Pred =
CI ? CI->getPredicate() : static_cast<CmpInst::Predicate>(
cast<ConstantExpr>(U).getPredicate());
if (CmpInst::isIntPredicate(Pred))
MIRBuilder.buildICmp(Pred, Res, Op0, Op1);
else if (Pred == CmpInst::FCMP_FALSE)
MIRBuilder.buildCopy(
Res, getOrCreateVReg(*Constant::getNullValue(CI->getType())));
else if (Pred == CmpInst::FCMP_TRUE)
MIRBuilder.buildCopy(
Res, getOrCreateVReg(*Constant::getAllOnesValue(CI->getType())));
else {
MIRBuilder.buildInstr(TargetOpcode::G_FCMP, {Res}, {Pred, Op0, Op1},
MachineInstr::copyFlagsFromInstruction(*CI));
}
return true;
}
bool IRTranslator::translateRet(const User &U, MachineIRBuilder &MIRBuilder) {
const ReturnInst &RI = cast<ReturnInst>(U);
const Value *Ret = RI.getReturnValue();
if (Ret && DL->getTypeStoreSize(Ret->getType()) == 0)
Ret = nullptr;
ArrayRef<Register> VRegs;
if (Ret)
VRegs = getOrCreateVRegs(*Ret);
Register SwiftErrorVReg = 0;
if (CLI->supportSwiftError() && SwiftError.getFunctionArg()) {
SwiftErrorVReg = SwiftError.getOrCreateVRegUseAt(
&RI, &MIRBuilder.getMBB(), SwiftError.getFunctionArg());
}
// The target may mess up with the insertion point, but
// this is not important as a return is the last instruction
// of the block anyway.
return CLI->lowerReturn(MIRBuilder, Ret, VRegs, SwiftErrorVReg);
}
bool IRTranslator::translateBr(const User &U, MachineIRBuilder &MIRBuilder) {
const BranchInst &BrInst = cast<BranchInst>(U);
unsigned Succ = 0;
if (!BrInst.isUnconditional()) {
// We want a G_BRCOND to the true BB followed by an unconditional branch.
Register Tst = getOrCreateVReg(*BrInst.getCondition());
const BasicBlock &TrueTgt = *cast<BasicBlock>(BrInst.getSuccessor(Succ++));
MachineBasicBlock &TrueBB = getMBB(TrueTgt);
MIRBuilder.buildBrCond(Tst, TrueBB);
}
const BasicBlock &BrTgt = *cast<BasicBlock>(BrInst.getSuccessor(Succ));
MachineBasicBlock &TgtBB = getMBB(BrTgt);
MachineBasicBlock &CurBB = MIRBuilder.getMBB();
// If the unconditional target is the layout successor, fallthrough.
if (!CurBB.isLayoutSuccessor(&TgtBB))
MIRBuilder.buildBr(TgtBB);
// Link successors.
for (const BasicBlock *Succ : successors(&BrInst))
CurBB.addSuccessor(&getMBB(*Succ));
return true;
}
void IRTranslator::addSuccessorWithProb(MachineBasicBlock *Src,
MachineBasicBlock *Dst,
BranchProbability Prob) {
if (!FuncInfo.BPI) {
Src->addSuccessorWithoutProb(Dst);
return;
}
if (Prob.isUnknown())
Prob = getEdgeProbability(Src, Dst);
Src->addSuccessor(Dst, Prob);
}
BranchProbability
IRTranslator::getEdgeProbability(const MachineBasicBlock *Src,
const MachineBasicBlock *Dst) const {
const BasicBlock *SrcBB = Src->getBasicBlock();
const BasicBlock *DstBB = Dst->getBasicBlock();
if (!FuncInfo.BPI) {
// If BPI is not available, set the default probability as 1 / N, where N is
// the number of successors.
auto SuccSize = std::max<uint32_t>(succ_size(SrcBB), 1);
return BranchProbability(1, SuccSize);
}
return FuncInfo.BPI->getEdgeProbability(SrcBB, DstBB);
}
bool IRTranslator::translateSwitch(const User &U, MachineIRBuilder &MIB) {
using namespace SwitchCG;
// Extract cases from the switch.
const SwitchInst &SI = cast<SwitchInst>(U);
BranchProbabilityInfo *BPI = FuncInfo.BPI;
CaseClusterVector Clusters;
Clusters.reserve(SI.getNumCases());
for (auto &I : SI.cases()) {
MachineBasicBlock *Succ = &getMBB(*I.getCaseSuccessor());
assert(Succ && "Could not find successor mbb in mapping");
const ConstantInt *CaseVal = I.getCaseValue();
BranchProbability Prob =
BPI ? BPI->getEdgeProbability(SI.getParent(), I.getSuccessorIndex())
: BranchProbability(1, SI.getNumCases() + 1);
Clusters.push_back(CaseCluster::range(CaseVal, CaseVal, Succ, Prob));
}
MachineBasicBlock *DefaultMBB = &getMBB(*SI.getDefaultDest());
// Cluster adjacent cases with the same destination. We do this at all
// optimization levels because it's cheap to do and will make codegen faster
// if there are many clusters.
sortAndRangeify(Clusters);
MachineBasicBlock *SwitchMBB = &getMBB(*SI.getParent());
// If there is only the default destination, jump there directly.
if (Clusters.empty()) {
SwitchMBB->addSuccessor(DefaultMBB);
if (DefaultMBB != SwitchMBB->getNextNode())
MIB.buildBr(*DefaultMBB);
return true;
}
SL->findJumpTables(Clusters, &SI, DefaultMBB);
LLVM_DEBUG({
dbgs() << "Case clusters: ";
for (const CaseCluster &C : Clusters) {
if (C.Kind == CC_JumpTable)
dbgs() << "JT:";
if (C.Kind == CC_BitTests)
dbgs() << "BT:";
C.Low->getValue().print(dbgs(), true);
if (C.Low != C.High) {
dbgs() << '-';
C.High->getValue().print(dbgs(), true);
}
dbgs() << ' ';
}
dbgs() << '\n';
});
assert(!Clusters.empty());
SwitchWorkList WorkList;
CaseClusterIt First = Clusters.begin();
CaseClusterIt Last = Clusters.end() - 1;
auto DefaultProb = getEdgeProbability(SwitchMBB, DefaultMBB);
WorkList.push_back({SwitchMBB, First, Last, nullptr, nullptr, DefaultProb});
// FIXME: At the moment we don't do any splitting optimizations here like
// SelectionDAG does, so this worklist only has one entry.
while (!WorkList.empty()) {
SwitchWorkListItem W = WorkList.back();
WorkList.pop_back();
if (!lowerSwitchWorkItem(W, SI.getCondition(), SwitchMBB, DefaultMBB, MIB))
return false;
}
return true;
}
void IRTranslator::emitJumpTable(SwitchCG::JumpTable &JT,
MachineBasicBlock *MBB) {
// Emit the code for the jump table
assert(JT.Reg != -1U && "Should lower JT Header first!");
MachineIRBuilder MIB(*MBB->getParent());
MIB.setMBB(*MBB);
MIB.setDebugLoc(CurBuilder->getDebugLoc());
Type *PtrIRTy = Type::getInt8PtrTy(MF->getFunction().getContext());
const LLT PtrTy = getLLTForType(*PtrIRTy, *DL);
auto Table = MIB.buildJumpTable(PtrTy, JT.JTI);
MIB.buildBrJT(Table.getReg(0), JT.JTI, JT.Reg);
}
bool IRTranslator::emitJumpTableHeader(SwitchCG::JumpTable &JT,
SwitchCG::JumpTableHeader &JTH,
MachineBasicBlock *HeaderBB) {
MachineIRBuilder MIB(*HeaderBB->getParent());
MIB.setMBB(*HeaderBB);
MIB.setDebugLoc(CurBuilder->getDebugLoc());
const Value &SValue = *JTH.SValue;
// Subtract the lowest switch case value from the value being switched on.
const LLT SwitchTy = getLLTForType(*SValue.getType(), *DL);
Register SwitchOpReg = getOrCreateVReg(SValue);
auto FirstCst = MIB.buildConstant(SwitchTy, JTH.First);
auto Sub = MIB.buildSub({SwitchTy}, SwitchOpReg, FirstCst);
// This value may be smaller or larger than the target's pointer type, and
// therefore require extension or truncating.
Type *PtrIRTy = SValue.getType()->getPointerTo();
const LLT PtrScalarTy = LLT::scalar(DL->getTypeSizeInBits(PtrIRTy));
Sub = MIB.buildZExtOrTrunc(PtrScalarTy, Sub);
JT.Reg = Sub.getReg(0);
if (JTH.OmitRangeCheck) {
if (JT.MBB != HeaderBB->getNextNode())
MIB.buildBr(*JT.MBB);
return true;
}
// Emit the range check for the jump table, and branch to the default block
// for the switch statement if the value being switched on exceeds the
// largest case in the switch.
auto Cst = getOrCreateVReg(
*ConstantInt::get(SValue.getType(), JTH.Last - JTH.First));
Cst = MIB.buildZExtOrTrunc(PtrScalarTy, Cst).getReg(0);
auto Cmp = MIB.buildICmp(CmpInst::ICMP_UGT, LLT::scalar(1), Sub, Cst);
auto BrCond = MIB.buildBrCond(Cmp.getReg(0), *JT.Default);
// Avoid emitting unnecessary branches to the next block.
if (JT.MBB != HeaderBB->getNextNode())
BrCond = MIB.buildBr(*JT.MBB);
return true;
}
void IRTranslator::emitSwitchCase(SwitchCG::CaseBlock &CB,
MachineBasicBlock *SwitchBB,
MachineIRBuilder &MIB) {
Register CondLHS = getOrCreateVReg(*CB.CmpLHS);
Register Cond;
DebugLoc OldDbgLoc = MIB.getDebugLoc();
MIB.setDebugLoc(CB.DbgLoc);
MIB.setMBB(*CB.ThisBB);
if (CB.PredInfo.NoCmp) {
// Branch or fall through to TrueBB.
addSuccessorWithProb(CB.ThisBB, CB.TrueBB, CB.TrueProb);
addMachineCFGPred({SwitchBB->getBasicBlock(), CB.TrueBB->getBasicBlock()},
CB.ThisBB);
CB.ThisBB->normalizeSuccProbs();
if (CB.TrueBB != CB.ThisBB->getNextNode())
MIB.buildBr(*CB.TrueBB);
MIB.setDebugLoc(OldDbgLoc);
return;
}
const LLT i1Ty = LLT::scalar(1);
// Build the compare.
if (!CB.CmpMHS) {
Register CondRHS = getOrCreateVReg(*CB.CmpRHS);
Cond = MIB.buildICmp(CB.PredInfo.Pred, i1Ty, CondLHS, CondRHS).getReg(0);
} else {
assert(CB.PredInfo.Pred == CmpInst::ICMP_ULE &&
"Can only handle ULE ranges");
const APInt& Low = cast<ConstantInt>(CB.CmpLHS)->getValue();
const APInt& High = cast<ConstantInt>(CB.CmpRHS)->getValue();
Register CmpOpReg = getOrCreateVReg(*CB.CmpMHS);
if (cast<ConstantInt>(CB.CmpLHS)->isMinValue(true)) {
Register CondRHS = getOrCreateVReg(*CB.CmpRHS);
Cond =
MIB.buildICmp(CmpInst::ICMP_ULE, i1Ty, CmpOpReg, CondRHS).getReg(0);
} else {
const LLT &CmpTy = MRI->getType(CmpOpReg);
auto Sub = MIB.buildSub({CmpTy}, CmpOpReg, CondLHS);
auto Diff = MIB.buildConstant(CmpTy, High - Low);
Cond = MIB.buildICmp(CmpInst::ICMP_ULE, i1Ty, Sub, Diff).getReg(0);
}
}
// Update successor info
addSuccessorWithProb(CB.ThisBB, CB.TrueBB, CB.TrueProb);
addMachineCFGPred({SwitchBB->getBasicBlock(), CB.TrueBB->getBasicBlock()},
CB.ThisBB);
// TrueBB and FalseBB are always different unless the incoming IR is
// degenerate. This only happens when running llc on weird IR.
if (CB.TrueBB != CB.FalseBB)
addSuccessorWithProb(CB.ThisBB, CB.FalseBB, CB.FalseProb);
CB.ThisBB->normalizeSuccProbs();
// if (SwitchBB->getBasicBlock() != CB.FalseBB->getBasicBlock())
addMachineCFGPred({SwitchBB->getBasicBlock(), CB.FalseBB->getBasicBlock()},
CB.ThisBB);
// If the lhs block is the next block, invert the condition so that we can
// fall through to the lhs instead of the rhs block.
if (CB.TrueBB == CB.ThisBB->getNextNode()) {
std::swap(CB.TrueBB, CB.FalseBB);
auto True = MIB.buildConstant(i1Ty, 1);
Cond = MIB.buildInstr(TargetOpcode::G_XOR, {i1Ty}, {Cond, True}, None)
.getReg(0);
}
MIB.buildBrCond(Cond, *CB.TrueBB);
MIB.buildBr(*CB.FalseBB);
MIB.setDebugLoc(OldDbgLoc);
}
bool IRTranslator::lowerJumpTableWorkItem(SwitchCG::SwitchWorkListItem W,
MachineBasicBlock *SwitchMBB,
MachineBasicBlock *CurMBB,
MachineBasicBlock *DefaultMBB,
MachineIRBuilder &MIB,
MachineFunction::iterator BBI,
BranchProbability UnhandledProbs,
SwitchCG::CaseClusterIt I,
MachineBasicBlock *Fallthrough,
bool FallthroughUnreachable) {
using namespace SwitchCG;
MachineFunction *CurMF = SwitchMBB->getParent();
// FIXME: Optimize away range check based on pivot comparisons.
JumpTableHeader *JTH = &SL->JTCases[I->JTCasesIndex].first;
SwitchCG::JumpTable *JT = &SL->JTCases[I->JTCasesIndex].second;
BranchProbability DefaultProb = W.DefaultProb;
// The jump block hasn't been inserted yet; insert it here.
MachineBasicBlock *JumpMBB = JT->MBB;
CurMF->insert(BBI, JumpMBB);
// Since the jump table block is separate from the switch block, we need
// to keep track of it as a machine predecessor to the default block,
// otherwise we lose the phi edges.
addMachineCFGPred({SwitchMBB->getBasicBlock(), DefaultMBB->getBasicBlock()},
CurMBB);
addMachineCFGPred({SwitchMBB->getBasicBlock(), DefaultMBB->getBasicBlock()},
JumpMBB);
auto JumpProb = I->Prob;
auto FallthroughProb = UnhandledProbs;
// If the default statement is a target of the jump table, we evenly
// distribute the default probability to successors of CurMBB. Also
// update the probability on the edge from JumpMBB to Fallthrough.
for (MachineBasicBlock::succ_iterator SI = JumpMBB->succ_begin(),
SE = JumpMBB->succ_end();
SI != SE; ++SI) {
if (*SI == DefaultMBB) {
JumpProb += DefaultProb / 2;
FallthroughProb -= DefaultProb / 2;
JumpMBB->setSuccProbability(SI, DefaultProb / 2);
JumpMBB->normalizeSuccProbs();
} else {
// Also record edges from the jump table block to it's successors.
addMachineCFGPred({SwitchMBB->getBasicBlock(), (*SI)->getBasicBlock()},
JumpMBB);
}
}
// Skip the range check if the fallthrough block is unreachable.
if (FallthroughUnreachable)
JTH->OmitRangeCheck = true;
if (!JTH->OmitRangeCheck)
addSuccessorWithProb(CurMBB, Fallthrough, FallthroughProb);
addSuccessorWithProb(CurMBB, JumpMBB, JumpProb);
CurMBB->normalizeSuccProbs();
// The jump table header will be inserted in our current block, do the
// range check, and fall through to our fallthrough block.
JTH->HeaderBB = CurMBB;
JT->Default = Fallthrough; // FIXME: Move Default to JumpTableHeader.
// If we're in the right place, emit the jump table header right now.
if (CurMBB == SwitchMBB) {
if (!emitJumpTableHeader(*JT, *JTH, CurMBB))
return false;
JTH->Emitted = true;
}
return true;
}
bool IRTranslator::lowerSwitchRangeWorkItem(SwitchCG::CaseClusterIt I,
Value *Cond,
MachineBasicBlock *Fallthrough,
bool FallthroughUnreachable,
BranchProbability UnhandledProbs,
MachineBasicBlock *CurMBB,
MachineIRBuilder &MIB,
MachineBasicBlock *SwitchMBB) {
using namespace SwitchCG;
const Value *RHS, *LHS, *MHS;
CmpInst::Predicate Pred;
if (I->Low == I->High) {
// Check Cond == I->Low.
Pred = CmpInst::ICMP_EQ;
LHS = Cond;
RHS = I->Low;
MHS = nullptr;
} else {
// Check I->Low <= Cond <= I->High.
Pred = CmpInst::ICMP_ULE;
LHS = I->Low;
MHS = Cond;
RHS = I->High;
}
// If Fallthrough is unreachable, fold away the comparison.
// The false probability is the sum of all unhandled cases.
CaseBlock CB(Pred, FallthroughUnreachable, LHS, RHS, MHS, I->MBB, Fallthrough,
CurMBB, MIB.getDebugLoc(), I->Prob, UnhandledProbs);
emitSwitchCase(CB, SwitchMBB, MIB);
return true;
}
bool IRTranslator::lowerSwitchWorkItem(SwitchCG::SwitchWorkListItem W,
Value *Cond,
MachineBasicBlock *SwitchMBB,
MachineBasicBlock *DefaultMBB,
MachineIRBuilder &MIB) {
using namespace SwitchCG;
MachineFunction *CurMF = FuncInfo.MF;
MachineBasicBlock *NextMBB = nullptr;
MachineFunction::iterator BBI(W.MBB);
if (++BBI != FuncInfo.MF->end())
NextMBB = &*BBI;
if (EnableOpts) {
// Here, we order cases by probability so the most likely case will be
// checked first. However, two clusters can have the same probability in
// which case their relative ordering is non-deterministic. So we use Low
// as a tie-breaker as clusters are guaranteed to never overlap.
llvm::sort(W.FirstCluster, W.LastCluster + 1,
[](const CaseCluster &a, const CaseCluster &b) {
return a.Prob != b.Prob
? a.Prob > b.Prob
: a.Low->getValue().slt(b.Low->getValue());
});
// Rearrange the case blocks so that the last one falls through if possible
// without changing the order of probabilities.
for (CaseClusterIt I = W.LastCluster; I > W.FirstCluster;) {
--I;
if (I->Prob > W.LastCluster->Prob)
break;
if (I->Kind == CC_Range && I->MBB == NextMBB) {
std::swap(*I, *W.LastCluster);
break;
}
}
}
// Compute total probability.
BranchProbability DefaultProb = W.DefaultProb;
BranchProbability UnhandledProbs = DefaultProb;
for (CaseClusterIt I = W.FirstCluster; I <= W.LastCluster; ++I)
UnhandledProbs += I->Prob;
MachineBasicBlock *CurMBB = W.MBB;
for (CaseClusterIt I = W.FirstCluster, E = W.LastCluster; I <= E; ++I) {
bool FallthroughUnreachable = false;
MachineBasicBlock *Fallthrough;
if (I == W.LastCluster) {
// For the last cluster, fall through to the default destination.
Fallthrough = DefaultMBB;
FallthroughUnreachable = isa<UnreachableInst>(
DefaultMBB->getBasicBlock()->getFirstNonPHIOrDbg());
} else {
Fallthrough = CurMF->CreateMachineBasicBlock(CurMBB->getBasicBlock());
CurMF->insert(BBI, Fallthrough);
}
UnhandledProbs -= I->Prob;
switch (I->Kind) {
case CC_BitTests: {
LLVM_DEBUG(dbgs() << "Switch to bit test optimization unimplemented");
return false; // Bit tests currently unimplemented.
}
case CC_JumpTable: {
if (!lowerJumpTableWorkItem(W, SwitchMBB, CurMBB, DefaultMBB, MIB, BBI,
UnhandledProbs, I, Fallthrough,
FallthroughUnreachable)) {
LLVM_DEBUG(dbgs() << "Failed to lower jump table");
return false;
}
break;
}
case CC_Range: {
if (!lowerSwitchRangeWorkItem(I, Cond, Fallthrough,
FallthroughUnreachable, UnhandledProbs,
CurMBB, MIB, SwitchMBB)) {
LLVM_DEBUG(dbgs() << "Failed to lower switch range");
return false;
}
break;
}
}
CurMBB = Fallthrough;
}
return true;
}
bool IRTranslator::translateIndirectBr(const User &U,
MachineIRBuilder &MIRBuilder) {
const IndirectBrInst &BrInst = cast<IndirectBrInst>(U);
const Register Tgt = getOrCreateVReg(*BrInst.getAddress());
MIRBuilder.buildBrIndirect(Tgt);
// Link successors.
MachineBasicBlock &CurBB = MIRBuilder.getMBB();
for (const BasicBlock *Succ : successors(&BrInst))
CurBB.addSuccessor(&getMBB(*Succ));
return true;
}
static bool isSwiftError(const Value *V) {
if (auto Arg = dyn_cast<Argument>(V))
return Arg->hasSwiftErrorAttr();
if (auto AI = dyn_cast<AllocaInst>(V))
return AI->isSwiftError();
return false;
}
bool IRTranslator::translateLoad(const User &U, MachineIRBuilder &MIRBuilder) {
const LoadInst &LI = cast<LoadInst>(U);
auto Flags = LI.isVolatile() ? MachineMemOperand::MOVolatile
: MachineMemOperand::MONone;
Flags |= MachineMemOperand::MOLoad;
if (DL->getTypeStoreSize(LI.getType()) == 0)
return true;
ArrayRef<Register> Regs = getOrCreateVRegs(LI);
ArrayRef<uint64_t> Offsets = *VMap.getOffsets(LI);
Register Base = getOrCreateVReg(*LI.getPointerOperand());
Type *OffsetIRTy = DL->getIntPtrType(LI.getPointerOperandType());
LLT OffsetTy = getLLTForType(*OffsetIRTy, *DL);
if (CLI->supportSwiftError() && isSwiftError(LI.getPointerOperand())) {
assert(Regs.size() == 1 && "swifterror should be single pointer");
Register VReg = SwiftError.getOrCreateVRegUseAt(&LI, &MIRBuilder.getMBB(),
LI.getPointerOperand());
MIRBuilder.buildCopy(Regs[0], VReg);
return true;
}
const MDNode *Ranges =
Regs.size() == 1 ? LI.getMetadata(LLVMContext::MD_range) : nullptr;
for (unsigned i = 0; i < Regs.size(); ++i) {
Register Addr;
MIRBuilder.materializeGEP(Addr, Base, OffsetTy, Offsets[i] / 8);
MachinePointerInfo Ptr(LI.getPointerOperand(), Offsets[i] / 8);
unsigned BaseAlign = getMemOpAlignment(LI);
auto MMO = MF->getMachineMemOperand(
Ptr, Flags, (MRI->getType(Regs[i]).getSizeInBits() + 7) / 8,
MinAlign(BaseAlign, Offsets[i] / 8), AAMDNodes(), Ranges,
LI.getSyncScopeID(), LI.getOrdering());
MIRBuilder.buildLoad(Regs[i], Addr, *MMO);
}
return true;
}
bool IRTranslator::translateStore(const User &U, MachineIRBuilder &MIRBuilder) {
const StoreInst &SI = cast<StoreInst>(U);
auto Flags = SI.isVolatile() ? MachineMemOperand::MOVolatile
: MachineMemOperand::MONone;
Flags |= MachineMemOperand::MOStore;
if (DL->getTypeStoreSize(SI.getValueOperand()->getType()) == 0)
return true;
ArrayRef<Register> Vals = getOrCreateVRegs(*SI.getValueOperand());
ArrayRef<uint64_t> Offsets = *VMap.getOffsets(*SI.getValueOperand());
Register Base = getOrCreateVReg(*SI.getPointerOperand());
Type *OffsetIRTy = DL->getIntPtrType(SI.getPointerOperandType());
LLT OffsetTy = getLLTForType(*OffsetIRTy, *DL);
if (CLI->supportSwiftError() && isSwiftError(SI.getPointerOperand())) {
assert(Vals.size() == 1 && "swifterror should be single pointer");
Register VReg = SwiftError.getOrCreateVRegDefAt(&SI, &MIRBuilder.getMBB(),
SI.getPointerOperand());
MIRBuilder.buildCopy(VReg, Vals[0]);
return true;
}
for (unsigned i = 0; i < Vals.size(); ++i) {
Register Addr;
MIRBuilder.materializeGEP(Addr, Base, OffsetTy, Offsets[i] / 8);
MachinePointerInfo Ptr(SI.getPointerOperand(), Offsets[i] / 8);
unsigned BaseAlign = getMemOpAlignment(SI);
auto MMO = MF->getMachineMemOperand(
Ptr, Flags, (MRI->getType(Vals[i]).getSizeInBits() + 7) / 8,
MinAlign(BaseAlign, Offsets[i] / 8), AAMDNodes(), nullptr,
SI.getSyncScopeID(), SI.getOrdering());
MIRBuilder.buildStore(Vals[i], Addr, *MMO);
}
return true;
}
static uint64_t getOffsetFromIndices(const User &U, const DataLayout &DL) {
const Value *Src = U.getOperand(0);
Type *Int32Ty = Type::getInt32Ty(U.getContext());
// getIndexedOffsetInType is designed for GEPs, so the first index is the
// usual array element rather than looking into the actual aggregate.
SmallVector<Value *, 1> Indices;
Indices.push_back(ConstantInt::get(Int32Ty, 0));
if (const ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(&U)) {
for (auto Idx : EVI->indices())
Indices.push_back(ConstantInt::get(Int32Ty, Idx));
} else if (const InsertValueInst *IVI = dyn_cast<InsertValueInst>(&U)) {
for (auto Idx : IVI->indices())
Indices.push_back(ConstantInt::get(Int32Ty, Idx));
} else {
for (unsigned i = 1; i < U.getNumOperands(); ++i)
Indices.push_back(U.getOperand(i));
}
return 8 * static_cast<uint64_t>(
DL.getIndexedOffsetInType(Src->getType(), Indices));
}
bool IRTranslator::translateExtractValue(const User &U,
MachineIRBuilder &MIRBuilder) {
const Value *Src = U.getOperand(0);
uint64_t Offset = getOffsetFromIndices(U, *DL);
ArrayRef<Register> SrcRegs = getOrCreateVRegs(*Src);
ArrayRef<uint64_t> Offsets = *VMap.getOffsets(*Src);
unsigned Idx = llvm::lower_bound(Offsets, Offset) - Offsets.begin();
auto &DstRegs = allocateVRegs(U);
for (unsigned i = 0; i < DstRegs.size(); ++i)
DstRegs[i] = SrcRegs[Idx++];
return true;
}
bool IRTranslator::translateInsertValue(const User &U,
MachineIRBuilder &MIRBuilder) {
const Value *Src = U.getOperand(0);
uint64_t Offset = getOffsetFromIndices(U, *DL);
auto &DstRegs = allocateVRegs(U);
ArrayRef<uint64_t> DstOffsets = *VMap.getOffsets(U);
ArrayRef<Register> SrcRegs = getOrCreateVRegs(*Src);
ArrayRef<Register> InsertedRegs = getOrCreateVRegs(*U.getOperand(1));
auto InsertedIt = InsertedRegs.begin();
for (unsigned i = 0; i < DstRegs.size(); ++i) {
if (DstOffsets[i] >= Offset && InsertedIt != InsertedRegs.end())
DstRegs[i] = *InsertedIt++;
else
DstRegs[i] = SrcRegs[i];
}
return true;
}
bool IRTranslator::translateSelect(const User &U,
MachineIRBuilder &MIRBuilder) {
Register Tst = getOrCreateVReg(*U.getOperand(0));
ArrayRef<Register> ResRegs = getOrCreateVRegs(U);
ArrayRef<Register> Op0Regs = getOrCreateVRegs(*U.getOperand(1));
ArrayRef<Register> Op1Regs = getOrCreateVRegs(*U.getOperand(2));
const SelectInst &SI = cast<SelectInst>(U);
uint16_t Flags = 0;
if (const CmpInst *Cmp = dyn_cast<CmpInst>(SI.getCondition()))
Flags = MachineInstr::copyFlagsFromInstruction(*Cmp);
for (unsigned i = 0; i < ResRegs.size(); ++i) {
MIRBuilder.buildInstr(TargetOpcode::G_SELECT, {ResRegs[i]},
{Tst, Op0Regs[i], Op1Regs[i]}, Flags);
}
return true;
}
bool IRTranslator::translateBitCast(const User &U,
MachineIRBuilder &MIRBuilder) {
// If we're bitcasting to the source type, we can reuse the source vreg.
if (getLLTForType(*U.getOperand(0)->getType(), *DL) ==
getLLTForType(*U.getType(), *DL)) {
Register SrcReg = getOrCreateVReg(*U.getOperand(0));
auto &Regs = *VMap.getVRegs(U);
// If we already assigned a vreg for this bitcast, we can't change that.
// Emit a copy to satisfy the users we already emitted.
if (!Regs.empty())
MIRBuilder.buildCopy(Regs[0], SrcReg);
else {
Regs.push_back(SrcReg);
VMap.getOffsets(U)->push_back(0);
}
return true;
}
return translateCast(TargetOpcode::G_BITCAST, U, MIRBuilder);
}
bool IRTranslator::translateCast(unsigned Opcode, const User &U,
MachineIRBuilder &MIRBuilder) {
Register Op = getOrCreateVReg(*U.getOperand(0));
Register Res = getOrCreateVReg(U);
MIRBuilder.buildInstr(Opcode, {Res}, {Op});
return true;
}
bool IRTranslator::translateGetElementPtr(const User &U,
MachineIRBuilder &MIRBuilder) {
// FIXME: support vector GEPs.
if (U.getType()->isVectorTy())
return false;
Value &Op0 = *U.getOperand(0);
Register BaseReg = getOrCreateVReg(Op0);
Type *PtrIRTy = Op0.getType();
LLT PtrTy = getLLTForType(*PtrIRTy, *DL);
Type *OffsetIRTy = DL->getIntPtrType(PtrIRTy);
LLT OffsetTy = getLLTForType(*OffsetIRTy, *DL);
int64_t Offset = 0;
for (gep_type_iterator GTI = gep_type_begin(&U), E = gep_type_end(&U);
GTI != E; ++GTI) {
const Value *Idx = GTI.getOperand();
if (StructType *StTy = GTI.getStructTypeOrNull()) {
unsigned Field = cast<Constant>(Idx)->getUniqueInteger().getZExtValue();
Offset += DL->getStructLayout(StTy)->getElementOffset(Field);
continue;
} else {
uint64_t ElementSize = DL->getTypeAllocSize(GTI.getIndexedType());
// If this is a scalar constant or a splat vector of constants,
// handle it quickly.
if (const auto *CI = dyn_cast<ConstantInt>(Idx)) {
Offset += ElementSize * CI->getSExtValue();
continue;
}
if (Offset != 0) {
LLT OffsetTy = getLLTForType(*OffsetIRTy, *DL);
auto OffsetMIB = MIRBuilder.buildConstant({OffsetTy}, Offset);
BaseReg =
MIRBuilder.buildGEP(PtrTy, BaseReg, OffsetMIB.getReg(0)).getReg(0);
Offset = 0;
}
Register IdxReg = getOrCreateVReg(*Idx);
if (MRI->getType(IdxReg) != OffsetTy)
IdxReg = MIRBuilder.buildSExtOrTrunc(OffsetTy, IdxReg).getReg(0);
// N = N + Idx * ElementSize;
// Avoid doing it for ElementSize of 1.
Register GepOffsetReg;
if (ElementSize != 1) {
auto ElementSizeMIB = MIRBuilder.buildConstant(
getLLTForType(*OffsetIRTy, *DL), ElementSize);
GepOffsetReg =
MIRBuilder.buildMul(OffsetTy, ElementSizeMIB, IdxReg).getReg(0);
} else
GepOffsetReg = IdxReg;
BaseReg = MIRBuilder.buildGEP(PtrTy, BaseReg, GepOffsetReg).getReg(0);
}
}
if (Offset != 0) {
auto OffsetMIB =
MIRBuilder.buildConstant(getLLTForType(*OffsetIRTy, *DL), Offset);
MIRBuilder.buildGEP(getOrCreateVReg(U), BaseReg, OffsetMIB.getReg(0));
return true;
}
MIRBuilder.buildCopy(getOrCreateVReg(U), BaseReg);
return true;
}
bool IRTranslator::translateMemFunc(const CallInst &CI,
MachineIRBuilder &MIRBuilder,
Intrinsic::ID ID) {
// If the source is undef, then just emit a nop.
if (isa<UndefValue>(CI.getArgOperand(1)))
return true;
ArrayRef<Register> Res;
auto ICall = MIRBuilder.buildIntrinsic(ID, Res, true);
for (auto AI = CI.arg_begin(), AE = CI.arg_end(); std::next(AI) != AE; ++AI)
ICall.addUse(getOrCreateVReg(**AI));
unsigned DstAlign = 0, SrcAlign = 0;
unsigned IsVol =
cast<ConstantInt>(CI.getArgOperand(CI.getNumArgOperands() - 1))
->getZExtValue();
if (auto *MCI = dyn_cast<MemCpyInst>(&CI)) {
DstAlign = std::max<unsigned>(MCI->getDestAlignment(), 1);
SrcAlign = std::max<unsigned>(MCI->getSourceAlignment(), 1);
} else if (auto *MMI = dyn_cast<MemMoveInst>(&CI)) {
DstAlign = std::max<unsigned>(MMI->getDestAlignment(), 1);
SrcAlign = std::max<unsigned>(MMI->getSourceAlignment(), 1);
} else {
auto *MSI = cast<MemSetInst>(&CI);
DstAlign = std::max<unsigned>(MSI->getDestAlignment(), 1);
}
// Create mem operands to store the alignment and volatile info.
auto VolFlag = IsVol ? MachineMemOperand::MOVolatile : MachineMemOperand::MONone;
ICall.addMemOperand(MF->getMachineMemOperand(
MachinePointerInfo(CI.getArgOperand(0)),
MachineMemOperand::MOStore | VolFlag, 1, DstAlign));
if (ID != Intrinsic::memset)
ICall.addMemOperand(MF->getMachineMemOperand(
MachinePointerInfo(CI.getArgOperand(1)),
MachineMemOperand::MOLoad | VolFlag, 1, SrcAlign));
return true;
}
void IRTranslator::getStackGuard(Register DstReg,
MachineIRBuilder &MIRBuilder) {
const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
MRI->setRegClass(DstReg, TRI->getPointerRegClass(*MF));
auto MIB = MIRBuilder.buildInstr(TargetOpcode::LOAD_STACK_GUARD);
MIB.addDef(DstReg);
auto &TLI = *MF->getSubtarget().getTargetLowering();
Value *Global = TLI.getSDagStackGuard(*MF->getFunction().getParent());
if (!Global)
return;
MachinePointerInfo MPInfo(Global);
auto Flags = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant |
MachineMemOperand::MODereferenceable;
MachineMemOperand *MemRef =
MF->getMachineMemOperand(MPInfo, Flags, DL->getPointerSizeInBits() / 8,
DL->getPointerABIAlignment(0));
MIB.setMemRefs({MemRef});
}
bool IRTranslator::translateOverflowIntrinsic(const CallInst &CI, unsigned Op,
MachineIRBuilder &MIRBuilder) {
ArrayRef<Register> ResRegs = getOrCreateVRegs(CI);
MIRBuilder.buildInstr(Op)
.addDef(ResRegs[0])
.addDef(ResRegs[1])
.addUse(getOrCreateVReg(*CI.getOperand(0)))
.addUse(getOrCreateVReg(*CI.getOperand(1)));
return true;
}
unsigned IRTranslator::getSimpleIntrinsicOpcode(Intrinsic::ID ID) {
switch (ID) {
default:
break;
case Intrinsic::bswap:
return TargetOpcode::G_BSWAP;
case Intrinsic::bitreverse:
return TargetOpcode::G_BITREVERSE;
case Intrinsic::ceil:
return TargetOpcode::G_FCEIL;
case Intrinsic::cos:
return TargetOpcode::G_FCOS;
case Intrinsic::ctpop:
return TargetOpcode::G_CTPOP;
case Intrinsic::exp:
return TargetOpcode::G_FEXP;
case Intrinsic::exp2:
return TargetOpcode::G_FEXP2;
case Intrinsic::fabs:
return TargetOpcode::G_FABS;
case Intrinsic::copysign:
return TargetOpcode::G_FCOPYSIGN;
case Intrinsic::minnum:
return TargetOpcode::G_FMINNUM;
case Intrinsic::maxnum:
return TargetOpcode::G_FMAXNUM;
case Intrinsic::minimum:
return TargetOpcode::G_FMINIMUM;
case Intrinsic::maximum:
return TargetOpcode::G_FMAXIMUM;
case Intrinsic::canonicalize:
return TargetOpcode::G_FCANONICALIZE;
case Intrinsic::floor:
return TargetOpcode::G_FFLOOR;
case Intrinsic::fma:
return TargetOpcode::G_FMA;
case Intrinsic::log:
return TargetOpcode::G_FLOG;
case Intrinsic::log2:
return TargetOpcode::G_FLOG2;
case Intrinsic::log10:
return TargetOpcode::G_FLOG10;
case Intrinsic::nearbyint:
return TargetOpcode::G_FNEARBYINT;
case Intrinsic::pow:
return TargetOpcode::G_FPOW;
case Intrinsic::rint:
return TargetOpcode::G_FRINT;
case Intrinsic::round:
return TargetOpcode::G_INTRINSIC_ROUND;
case Intrinsic::sin:
return TargetOpcode::G_FSIN;
case Intrinsic::sqrt:
return TargetOpcode::G_FSQRT;
case Intrinsic::trunc:
return TargetOpcode::G_INTRINSIC_TRUNC;
}
return Intrinsic::not_intrinsic;
}
bool IRTranslator::translateSimpleIntrinsic(const CallInst &CI,
Intrinsic::ID ID,
MachineIRBuilder &MIRBuilder) {
unsigned Op = getSimpleIntrinsicOpcode(ID);
// Is this a simple intrinsic?
if (Op == Intrinsic::not_intrinsic)
return false;
// Yes. Let's translate it.
SmallVector<llvm::SrcOp, 4> VRegs;
for (auto &Arg : CI.arg_operands())
VRegs.push_back(getOrCreateVReg(*Arg));
MIRBuilder.buildInstr(Op, {getOrCreateVReg(CI)}, VRegs,
MachineInstr::copyFlagsFromInstruction(CI));
return true;
}
bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
MachineIRBuilder &MIRBuilder) {
// If this is a simple intrinsic (that is, we just need to add a def of
// a vreg, and uses for each arg operand, then translate it.
if (translateSimpleIntrinsic(CI, ID, MIRBuilder))
return true;
switch (ID) {
default:
break;
case Intrinsic::lifetime_start:
case Intrinsic::lifetime_end: {
// No stack colouring in O0, discard region information.
if (MF->getTarget().getOptLevel() == CodeGenOpt::None)
return true;
unsigned Op = ID == Intrinsic::lifetime_start ? TargetOpcode::LIFETIME_START
: TargetOpcode::LIFETIME_END;
// Get the underlying objects for the location passed on the lifetime
// marker.
SmallVector<const Value *, 4> Allocas;
GetUnderlyingObjects(CI.getArgOperand(1), Allocas, *DL);
// Iterate over each underlying object, creating lifetime markers for each
// static alloca. Quit if we find a non-static alloca.
for (const Value *V : Allocas) {
const AllocaInst *AI = dyn_cast<AllocaInst>(V);
if (!AI)
continue;
if (!AI->isStaticAlloca())
return true;
MIRBuilder.buildInstr(Op).addFrameIndex(getOrCreateFrameIndex(*AI));
}
return true;
}
case Intrinsic::dbg_declare: {
const DbgDeclareInst &DI = cast<DbgDeclareInst>(CI);
assert(DI.getVariable() && "Missing variable");
const Value *Address = DI.getAddress();
if (!Address || isa<UndefValue>(Address)) {
LLVM_DEBUG(dbgs() << "Dropping debug info for " << DI << "\n");
return true;
}
assert(DI.getVariable()->isValidLocationForIntrinsic(
MIRBuilder.getDebugLoc()) &&
"Expected inlined-at fields to agree");
auto AI = dyn_cast<AllocaInst>(Address);
if (AI && AI->isStaticAlloca()) {
// Static allocas are tracked at the MF level, no need for DBG_VALUE
// instructions (in fact, they get ignored if they *do* exist).
MF->setVariableDbgInfo(DI.getVariable(), DI.getExpression(),
getOrCreateFrameIndex(*AI), DI.getDebugLoc());
} else {
// A dbg.declare describes the address of a source variable, so lower it
// into an indirect DBG_VALUE.
MIRBuilder.buildIndirectDbgValue(getOrCreateVReg(*Address),
DI.getVariable(), DI.getExpression());
}
return true;
}
case Intrinsic::dbg_label: {
const DbgLabelInst &DI = cast<DbgLabelInst>(CI);
assert(DI.getLabel() && "Missing label");
assert(DI.getLabel()->isValidLocationForIntrinsic(
MIRBuilder.getDebugLoc()) &&
"Expected inlined-at fields to agree");
MIRBuilder.buildDbgLabel(DI.getLabel());
return true;
}
case Intrinsic::vaend:
// No target I know of cares about va_end. Certainly no in-tree target
// does. Simplest intrinsic ever!
return true;
case Intrinsic::vastart: {
auto &TLI = *MF->getSubtarget().getTargetLowering();
Value *Ptr = CI.getArgOperand(0);
unsigned ListSize = TLI.getVaListSizeInBits(*DL) / 8;
// FIXME: Get alignment
MIRBuilder.buildInstr(TargetOpcode::G_VASTART)
.addUse(getOrCreateVReg(*Ptr))
.addMemOperand(MF->getMachineMemOperand(
MachinePointerInfo(Ptr), MachineMemOperand::MOStore, ListSize, 1));
return true;
}
case Intrinsic::dbg_value: {
// This form of DBG_VALUE is target-independent.
const DbgValueInst &DI = cast<DbgValueInst>(CI);
const Value *V = DI.getValue();
assert(DI.getVariable()->isValidLocationForIntrinsic(
MIRBuilder.getDebugLoc()) &&
"Expected inlined-at fields to agree");
if (!V) {
// Currently the optimizer can produce this; insert an undef to
// help debugging. Probably the optimizer should not do this.
MIRBuilder.buildIndirectDbgValue(0, DI.getVariable(), DI.getExpression());
} else if (const auto *CI = dyn_cast<Constant>(V)) {
MIRBuilder.buildConstDbgValue(*CI, DI.getVariable(), DI.getExpression());
} else {
for (Register Reg : getOrCreateVRegs(*V)) {
// FIXME: This does not handle register-indirect values at offset 0. The
// direct/indirect thing shouldn't really be handled by something as
// implicit as reg+noreg vs reg+imm in the first place, but it seems
// pretty baked in right now.
MIRBuilder.buildDirectDbgValue(Reg, DI.getVariable(), DI.getExpression());
}
}
return true;
}
case Intrinsic::uadd_with_overflow:
return translateOverflowIntrinsic(CI, TargetOpcode::G_UADDO, MIRBuilder);
case Intrinsic::sadd_with_overflow:
return translateOverflowIntrinsic(CI, TargetOpcode::G_SADDO, MIRBuilder);
case Intrinsic::usub_with_overflow:
return translateOverflowIntrinsic(CI, TargetOpcode::G_USUBO, MIRBuilder);
case Intrinsic::ssub_with_overflow:
return translateOverflowIntrinsic(CI, TargetOpcode::G_SSUBO, MIRBuilder);
case Intrinsic::umul_with_overflow:
return translateOverflowIntrinsic(CI, TargetOpcode::G_UMULO, MIRBuilder);
case Intrinsic::smul_with_overflow:
return translateOverflowIntrinsic(CI, TargetOpcode::G_SMULO, MIRBuilder);
case Intrinsic::fmuladd: {
const TargetMachine &TM = MF->getTarget();
const TargetLowering &TLI = *MF->getSubtarget().getTargetLowering();
Register Dst = getOrCreateVReg(CI);
Register Op0 = getOrCreateVReg(*CI.getArgOperand(0));
Register Op1 = getOrCreateVReg(*CI.getArgOperand(1));
Register Op2 = getOrCreateVReg(*CI.getArgOperand(2));
if (TM.Options.AllowFPOpFusion != FPOpFusion::Strict &&
TLI.isFMAFasterThanFMulAndFAdd(TLI.getValueType(*DL, CI.getType()))) {
// TODO: Revisit this to see if we should move this part of the
// lowering to the combiner.
MIRBuilder.buildInstr(TargetOpcode::G_FMA, {Dst}, {Op0, Op1, Op2},
MachineInstr::copyFlagsFromInstruction(CI));
} else {
LLT Ty = getLLTForType(*CI.getType(), *DL);
auto FMul = MIRBuilder.buildInstr(TargetOpcode::G_FMUL, {Ty}, {Op0, Op1},
MachineInstr::copyFlagsFromInstruction(CI));
MIRBuilder.buildInstr(TargetOpcode::G_FADD, {Dst}, {FMul, Op2},
MachineInstr::copyFlagsFromInstruction(CI));
}
return true;
}
case Intrinsic::memcpy:
case Intrinsic::memmove:
case Intrinsic::memset:
return translateMemFunc(CI, MIRBuilder, ID);
case Intrinsic::eh_typeid_for: {
GlobalValue *GV = ExtractTypeInfo(CI.getArgOperand(0));
Register Reg = getOrCreateVReg(CI);
unsigned TypeID = MF->getTypeIDFor(GV);
MIRBuilder.buildConstant(Reg, TypeID);
return true;
}
case Intrinsic::objectsize: {
// If we don't know by now, we're never going to know.
const ConstantInt *Min = cast<ConstantInt>(CI.getArgOperand(1));
MIRBuilder.buildConstant(getOrCreateVReg(CI), Min->isZero() ? -1ULL : 0);
return true;
}
case Intrinsic::is_constant:
// If this wasn't constant-folded away by now, then it's not a
// constant.
MIRBuilder.buildConstant(getOrCreateVReg(CI), 0);
return true;
case Intrinsic::stackguard:
getStackGuard(getOrCreateVReg(CI), MIRBuilder);
return true;
case Intrinsic::stackprotector: {
LLT PtrTy = getLLTForType(*CI.getArgOperand(0)->getType(), *DL);
Register GuardVal = MRI->createGenericVirtualRegister(PtrTy);
getStackGuard(GuardVal, MIRBuilder);
AllocaInst *Slot = cast<AllocaInst>(CI.getArgOperand(1));
int FI = getOrCreateFrameIndex(*Slot);
MF->getFrameInfo().setStackProtectorIndex(FI);
MIRBuilder.buildStore(
GuardVal, getOrCreateVReg(*Slot),
*MF->getMachineMemOperand(MachinePointerInfo::getFixedStack(*MF, FI),
MachineMemOperand::MOStore |
MachineMemOperand::MOVolatile,
PtrTy.getSizeInBits() / 8, 8));
return true;
}
case Intrinsic::stacksave: {
// Save the stack pointer to the location provided by the intrinsic.
Register Reg = getOrCreateVReg(CI);
Register StackPtr = MF->getSubtarget()
.getTargetLowering()
->getStackPointerRegisterToSaveRestore();
// If the target doesn't specify a stack pointer, then fall back.
if (!StackPtr)
return false;
MIRBuilder.buildCopy(Reg, StackPtr);
return true;
}
case Intrinsic::stackrestore: {
// Restore the stack pointer from the location provided by the intrinsic.
Register Reg = getOrCreateVReg(*CI.getArgOperand(0));
Register StackPtr = MF->getSubtarget()
.getTargetLowering()
->getStackPointerRegisterToSaveRestore();
// If the target doesn't specify a stack pointer, then fall back.
if (!StackPtr)
return false;
MIRBuilder.buildCopy(StackPtr, Reg);
return true;
}
case Intrinsic::cttz:
case Intrinsic::ctlz: {
ConstantInt *Cst = cast<ConstantInt>(CI.getArgOperand(1));
bool isTrailing = ID == Intrinsic::cttz;
unsigned Opcode = isTrailing
? Cst->isZero() ? TargetOpcode::G_CTTZ
: TargetOpcode::G_CTTZ_ZERO_UNDEF
: Cst->isZero() ? TargetOpcode::G_CTLZ
: TargetOpcode::G_CTLZ_ZERO_UNDEF;
MIRBuilder.buildInstr(Opcode)
.addDef(getOrCreateVReg(CI))
.addUse(getOrCreateVReg(*CI.getArgOperand(0)));
return true;
}
case Intrinsic::invariant_start: {
LLT PtrTy = getLLTForType(*CI.getArgOperand(0)->getType(), *DL);
Register Undef = MRI->createGenericVirtualRegister(PtrTy);
MIRBuilder.buildUndef(Undef);
return true;
}
case Intrinsic::invariant_end:
return true;
case Intrinsic::assume:
case Intrinsic::var_annotation:
case Intrinsic::sideeffect:
// Discard annotate attributes, assumptions, and artificial side-effects.
return true;
}
return false;
}
bool IRTranslator::translateInlineAsm(const CallInst &CI,
MachineIRBuilder &MIRBuilder) {
const InlineAsm &IA = cast<InlineAsm>(*CI.getCalledValue());
if (!IA.getConstraintString().empty())
return false;
unsigned ExtraInfo = 0;
if (IA.hasSideEffects())
ExtraInfo |= InlineAsm::Extra_HasSideEffects;
if (IA.getDialect() == InlineAsm::AD_Intel)
ExtraInfo |= InlineAsm::Extra_AsmDialect;
MIRBuilder.buildInstr(TargetOpcode::INLINEASM)
.addExternalSymbol(IA.getAsmString().c_str())
.addImm(ExtraInfo);
return true;
}
bool IRTranslator::translateCallSite(const ImmutableCallSite &CS,
MachineIRBuilder &MIRBuilder) {
const Instruction &I = *CS.getInstruction();
ArrayRef<Register> Res = getOrCreateVRegs(I);
SmallVector<ArrayRef<Register>, 8> Args;
Register SwiftInVReg = 0;
Register SwiftErrorVReg = 0;
for (auto &Arg : CS.args()) {
if (CLI->supportSwiftError() && isSwiftError(Arg)) {
assert(SwiftInVReg == 0 && "Expected only one swift error argument");
LLT Ty = getLLTForType(*Arg->getType(), *DL);
SwiftInVReg = MRI->createGenericVirtualRegister(Ty);
MIRBuilder.buildCopy(SwiftInVReg, SwiftError.getOrCreateVRegUseAt(
&I, &MIRBuilder.getMBB(), Arg));
Args.emplace_back(makeArrayRef(SwiftInVReg));
SwiftErrorVReg =
SwiftError.getOrCreateVRegDefAt(&I, &MIRBuilder.getMBB(), Arg);
continue;
}
Args.push_back(getOrCreateVRegs(*Arg));
}
// We don't set HasCalls on MFI here yet because call lowering may decide to
// optimize into tail calls. Instead, we defer that to selection where a final
// scan is done to check if any instructions are calls.
bool Success =
CLI->lowerCall(MIRBuilder, CS, Res, Args, SwiftErrorVReg,
[&]() { return getOrCreateVReg(*CS.getCalledValue()); });
// Check if we just inserted a tail call.
if (Success) {
assert(!HasTailCall && "Can't tail call return twice from block?");
const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
HasTailCall = TII->isTailCall(*std::prev(MIRBuilder.getInsertPt()));
}
return Success;
}
bool IRTranslator::translateCall(const User &U, MachineIRBuilder &MIRBuilder) {
const CallInst &CI = cast<CallInst>(U);
auto TII = MF->getTarget().getIntrinsicInfo();
const Function *F = CI.getCalledFunction();
// FIXME: support Windows dllimport function calls.
if (F && F->hasDLLImportStorageClass())
return false;
if (CI.isInlineAsm())
return translateInlineAsm(CI, MIRBuilder);
Intrinsic::ID ID = Intrinsic::not_intrinsic;
if (F && F->isIntrinsic()) {
ID = F->getIntrinsicID();
if (TII && ID == Intrinsic::not_intrinsic)
ID = static_cast<Intrinsic::ID>(TII->getIntrinsicID(F));
}
if (!F || !F->isIntrinsic() || ID == Intrinsic::not_intrinsic)
return translateCallSite(&CI, MIRBuilder);
assert(ID != Intrinsic::not_intrinsic && "unknown intrinsic");
if (translateKnownIntrinsic(CI, ID, MIRBuilder))
return true;
ArrayRef<Register> ResultRegs;
if (!CI.getType()->isVoidTy())
ResultRegs = getOrCreateVRegs(CI);
// Ignore the callsite attributes. Backend code is most likely not expecting
// an intrinsic to sometimes have side effects and sometimes not.
MachineInstrBuilder MIB =
MIRBuilder.buildIntrinsic(ID, ResultRegs, !F->doesNotAccessMemory());
if (isa<FPMathOperator>(CI))
MIB->copyIRFlags(CI);
for (auto &Arg : enumerate(CI.arg_operands())) {
// Some intrinsics take metadata parameters. Reject them.
if (isa<MetadataAsValue>(Arg.value()))
return false;
// If this is required to be an immediate, don't materialize it in a
// register.
if (CI.paramHasAttr(Arg.index(), Attribute::ImmArg)) {
if (ConstantInt *CI = dyn_cast<ConstantInt>(Arg.value())) {
// imm arguments are more convenient than cimm (and realistically
// probably sufficient), so use them.
assert(CI->getBitWidth() <= 64 &&
"large intrinsic immediates not handled");
MIB.addImm(CI->getSExtValue());
} else {
MIB.addFPImm(cast<ConstantFP>(Arg.value()));
}
} else {
ArrayRef<Register> VRegs = getOrCreateVRegs(*Arg.value());
if (VRegs.size() > 1)
return false;
MIB.addUse(VRegs[0]);
}
}
// Add a MachineMemOperand if it is a target mem intrinsic.
const TargetLowering &TLI = *MF->getSubtarget().getTargetLowering();
TargetLowering::IntrinsicInfo Info;
// TODO: Add a GlobalISel version of getTgtMemIntrinsic.
if (TLI.getTgtMemIntrinsic(Info, CI, *MF, ID)) {
MaybeAlign Align = Info.align;
if (!Align)
Align = MaybeAlign(
DL->getABITypeAlignment(Info.memVT.getTypeForEVT(F->getContext())));
uint64_t Size = Info.memVT.getStoreSize();
MIB.addMemOperand(MF->getMachineMemOperand(
MachinePointerInfo(Info.ptrVal), Info.flags, Size, Align->value()));
}
return true;
}
bool IRTranslator::translateInvoke(const User &U,
MachineIRBuilder &MIRBuilder) {
const InvokeInst &I = cast<InvokeInst>(U);
MCContext &Context = MF->getContext();
const BasicBlock *ReturnBB = I.getSuccessor(0);
const BasicBlock *EHPadBB = I.getSuccessor(1);
const Value *Callee = I.getCalledValue();
const Function *Fn = dyn_cast<Function>(Callee);
if (isa<InlineAsm>(Callee))
return false;
// FIXME: support invoking patchpoint and statepoint intrinsics.
if (Fn && Fn->isIntrinsic())
return false;
// FIXME: support whatever these are.
if (I.countOperandBundlesOfType(LLVMContext::OB_deopt))
return false;
// FIXME: support Windows exception handling.
if (!isa<LandingPadInst>(EHPadBB->front()))
return false;
// Emit the actual call, bracketed by EH_LABELs so that the MF knows about
// the region covered by the try.
MCSymbol *BeginSymbol = Context.createTempSymbol();
MIRBuilder.buildInstr(TargetOpcode::EH_LABEL).addSym(BeginSymbol);
if (!translateCallSite(&I, MIRBuilder))
return false;
MCSymbol *EndSymbol = Context.createTempSymbol();
MIRBuilder.buildInstr(TargetOpcode::EH_LABEL).addSym(EndSymbol);
// FIXME: track probabilities.
MachineBasicBlock &EHPadMBB = getMBB(*EHPadBB),
&ReturnMBB = getMBB(*ReturnBB);
MF->addInvoke(&EHPadMBB, BeginSymbol, EndSymbol);
MIRBuilder.getMBB().addSuccessor(&ReturnMBB);
MIRBuilder.getMBB().addSuccessor(&EHPadMBB);
MIRBuilder.buildBr(ReturnMBB);
return true;
}
bool IRTranslator::translateCallBr(const User &U,
MachineIRBuilder &MIRBuilder) {
// FIXME: Implement this.
return false;
}
bool IRTranslator::translateLandingPad(const User &U,
MachineIRBuilder &MIRBuilder) {
const LandingPadInst &LP = cast<LandingPadInst>(U);
MachineBasicBlock &MBB = MIRBuilder.getMBB();
MBB.setIsEHPad();
// If there aren't registers to copy the values into (e.g., during SjLj
// exceptions), then don't bother.
auto &TLI = *MF->getSubtarget().getTargetLowering();
const Constant *PersonalityFn = MF->getFunction().getPersonalityFn();
if (TLI.getExceptionPointerRegister(PersonalityFn) == 0 &&
TLI.getExceptionSelectorRegister(PersonalityFn) == 0)
return true;
// If landingpad's return type is token type, we don't create DAG nodes
// for its exception pointer and selector value. The extraction of exception
// pointer or selector value from token type landingpads is not currently
// supported.
if (LP.getType()->isTokenTy())
return true;
// Add a label to mark the beginning of the landing pad. Deletion of the
// landing pad can thus be detected via the MachineModuleInfo.
MIRBuilder.buildInstr(TargetOpcode::EH_LABEL)
.addSym(MF->addLandingPad(&MBB));
LLT Ty = getLLTForType(*LP.getType(), *DL);
Register Undef = MRI->createGenericVirtualRegister(Ty);
MIRBuilder.buildUndef(Undef);
SmallVector<LLT, 2> Tys;
for (Type *Ty : cast<StructType>(LP.getType())->elements())
Tys.push_back(getLLTForType(*Ty, *DL));
assert(Tys.size() == 2 && "Only two-valued landingpads are supported");
// Mark exception register as live in.
Register ExceptionReg = TLI.getExceptionPointerRegister(PersonalityFn);
if (!ExceptionReg)
return false;
MBB.addLiveIn(ExceptionReg);
ArrayRef<Register> ResRegs = getOrCreateVRegs(LP);
MIRBuilder.buildCopy(ResRegs[0], ExceptionReg);
Register SelectorReg = TLI.getExceptionSelectorRegister(PersonalityFn);
if (!SelectorReg)
return false;
MBB.addLiveIn(SelectorReg);
Register PtrVReg = MRI->createGenericVirtualRegister(Tys[0]);
MIRBuilder.buildCopy(PtrVReg, SelectorReg);
MIRBuilder.buildCast(ResRegs[1], PtrVReg);
return true;
}
bool IRTranslator::translateAlloca(const User &U,
MachineIRBuilder &MIRBuilder) {
auto &AI = cast<AllocaInst>(U);
if (AI.isSwiftError())
return true;
if (AI.isStaticAlloca()) {
Register Res = getOrCreateVReg(AI);
int FI = getOrCreateFrameIndex(AI);
MIRBuilder.buildFrameIndex(Res, FI);
return true;
}
// FIXME: support stack probing for Windows.
if (MF->getTarget().getTargetTriple().isOSWindows())
return false;
// Now we're in the harder dynamic case.
Type *Ty = AI.getAllocatedType();
unsigned Align =
std::max((unsigned)DL->getPrefTypeAlignment(Ty), AI.getAlignment());
Register NumElts = getOrCreateVReg(*AI.getArraySize());
Type *IntPtrIRTy = DL->getIntPtrType(AI.getType());
LLT IntPtrTy = getLLTForType(*IntPtrIRTy, *DL);
if (MRI->getType(NumElts) != IntPtrTy) {
Register ExtElts = MRI->createGenericVirtualRegister(IntPtrTy);
MIRBuilder.buildZExtOrTrunc(ExtElts, NumElts);
NumElts = ExtElts;
}
Register AllocSize = MRI->createGenericVirtualRegister(IntPtrTy);
Register TySize =
getOrCreateVReg(*ConstantInt::get(IntPtrIRTy, DL->getTypeAllocSize(Ty)));
MIRBuilder.buildMul(AllocSize, NumElts, TySize);
unsigned StackAlign =
MF->getSubtarget().getFrameLowering()->getStackAlignment();
if (Align <= StackAlign)
Align = 0;
// Round the size of the allocation up to the stack alignment size
// by add SA-1 to the size. This doesn't overflow because we're computing
// an address inside an alloca.
auto SAMinusOne = MIRBuilder.buildConstant(IntPtrTy, StackAlign - 1);
auto AllocAdd = MIRBuilder.buildAdd(IntPtrTy, AllocSize, SAMinusOne,
MachineInstr::NoUWrap);
auto AlignCst =
MIRBuilder.buildConstant(IntPtrTy, ~(uint64_t)(StackAlign - 1));
auto AlignedAlloc = MIRBuilder.buildAnd(IntPtrTy, AllocAdd, AlignCst);
MIRBuilder.buildDynStackAlloc(getOrCreateVReg(AI), AlignedAlloc, Align);
MF->getFrameInfo().CreateVariableSizedObject(Align ? Align : 1, &AI);
assert(MF->getFrameInfo().hasVarSizedObjects());
return true;
}
bool IRTranslator::translateVAArg(const User &U, MachineIRBuilder &MIRBuilder) {
// FIXME: We may need more info about the type. Because of how LLT works,
// we're completely discarding the i64/double distinction here (amongst
// others). Fortunately the ABIs I know of where that matters don't use va_arg
// anyway but that's not guaranteed.
MIRBuilder.buildInstr(TargetOpcode::G_VAARG)
.addDef(getOrCreateVReg(U))
.addUse(getOrCreateVReg(*U.getOperand(0)))
.addImm(DL->getABITypeAlignment(U.getType()));
return true;
}
bool IRTranslator::translateInsertElement(const User &U,
MachineIRBuilder &MIRBuilder) {
// If it is a <1 x Ty> vector, use the scalar as it is
// not a legal vector type in LLT.
if (U.getType()->getVectorNumElements() == 1) {
Register Elt = getOrCreateVReg(*U.getOperand(1));
auto &Regs = *VMap.getVRegs(U);
if (Regs.empty()) {
Regs.push_back(Elt);
VMap.getOffsets(U)->push_back(0);
} else {
MIRBuilder.buildCopy(Regs[0], Elt);
}
return true;
}
Register Res = getOrCreateVReg(U);
Register Val = getOrCreateVReg(*U.getOperand(0));
Register Elt = getOrCreateVReg(*U.getOperand(1));
Register Idx = getOrCreateVReg(*U.getOperand(2));
MIRBuilder.buildInsertVectorElement(Res, Val, Elt, Idx);
return true;
}
bool IRTranslator::translateExtractElement(const User &U,
MachineIRBuilder &MIRBuilder) {
// If it is a <1 x Ty> vector, use the scalar as it is
// not a legal vector type in LLT.
if (U.getOperand(0)->getType()->getVectorNumElements() == 1) {
Register Elt = getOrCreateVReg(*U.getOperand(0));
auto &Regs = *VMap.getVRegs(U);
if (Regs.empty()) {
Regs.push_back(Elt);
VMap.getOffsets(U)->push_back(0);
} else {
MIRBuilder.buildCopy(Regs[0], Elt);
}
return true;
}
Register Res = getOrCreateVReg(U);
Register Val = getOrCreateVReg(*U.getOperand(0));
const auto &TLI = *MF->getSubtarget().getTargetLowering();
unsigned PreferredVecIdxWidth = TLI.getVectorIdxTy(*DL).getSizeInBits();
Register Idx;
if (auto *CI = dyn_cast<ConstantInt>(U.getOperand(1))) {
if (CI->getBitWidth() != PreferredVecIdxWidth) {
APInt NewIdx = CI->getValue().sextOrTrunc(PreferredVecIdxWidth);
auto *NewIdxCI = ConstantInt::get(CI->getContext(), NewIdx);
Idx = getOrCreateVReg(*NewIdxCI);
}
}
if (!Idx)
Idx = getOrCreateVReg(*U.getOperand(1));
if (MRI->getType(Idx).getSizeInBits() != PreferredVecIdxWidth) {
const LLT &VecIdxTy = LLT::scalar(PreferredVecIdxWidth);
Idx = MIRBuilder.buildSExtOrTrunc(VecIdxTy, Idx)->getOperand(0).getReg();
}
MIRBuilder.buildExtractVectorElement(Res, Val, Idx);
return true;
}
bool IRTranslator::translateShuffleVector(const User &U,
MachineIRBuilder &MIRBuilder) {
MIRBuilder.buildInstr(TargetOpcode::G_SHUFFLE_VECTOR)
.addDef(getOrCreateVReg(U))
.addUse(getOrCreateVReg(*U.getOperand(0)))
.addUse(getOrCreateVReg(*U.getOperand(1)))
.addShuffleMask(cast<Constant>(U.getOperand(2)));
return true;
}
bool IRTranslator::translatePHI(const User &U, MachineIRBuilder &MIRBuilder) {
const PHINode &PI = cast<PHINode>(U);
SmallVector<MachineInstr *, 4> Insts;
for (auto Reg : getOrCreateVRegs(PI)) {
auto MIB = MIRBuilder.buildInstr(TargetOpcode::G_PHI, {Reg}, {});
Insts.push_back(MIB.getInstr());
}
PendingPHIs.emplace_back(&PI, std::move(Insts));
return true;
}
bool IRTranslator::translateAtomicCmpXchg(const User &U,
MachineIRBuilder &MIRBuilder) {
const AtomicCmpXchgInst &I = cast<AtomicCmpXchgInst>(U);
if (I.isWeak())
return false;
auto Flags = I.isVolatile() ? MachineMemOperand::MOVolatile
: MachineMemOperand::MONone;
Flags |= MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
Type *ResType = I.getType();
Type *ValType = ResType->Type::getStructElementType(0);
auto Res = getOrCreateVRegs(I);
Register OldValRes = Res[0];
Register SuccessRes = Res[1];
Register Addr = getOrCreateVReg(*I.getPointerOperand());
Register Cmp = getOrCreateVReg(*I.getCompareOperand());
Register NewVal = getOrCreateVReg(*I.getNewValOperand());
MIRBuilder.buildAtomicCmpXchgWithSuccess(
OldValRes, SuccessRes, Addr, Cmp, NewVal,
*MF->getMachineMemOperand(MachinePointerInfo(I.getPointerOperand()),
Flags, DL->getTypeStoreSize(ValType),
getMemOpAlignment(I), AAMDNodes(), nullptr,
I.getSyncScopeID(), I.getSuccessOrdering(),
I.getFailureOrdering()));
return true;
}
bool IRTranslator::translateAtomicRMW(const User &U,
MachineIRBuilder &MIRBuilder) {
const AtomicRMWInst &I = cast<AtomicRMWInst>(U);
auto Flags = I.isVolatile() ? MachineMemOperand::MOVolatile
: MachineMemOperand::MONone;
Flags |= MachineMemOperand::MOLoad | MachineMemOperand::MOStore;
Type *ResType = I.getType();
Register Res = getOrCreateVReg(I);
Register Addr = getOrCreateVReg(*I.getPointerOperand());
Register Val = getOrCreateVReg(*I.getValOperand());
unsigned Opcode = 0;
switch (I.getOperation()) {
default:
return false;
case AtomicRMWInst::Xchg:
Opcode = TargetOpcode::G_ATOMICRMW_XCHG;
break;
case AtomicRMWInst::Add:
Opcode = TargetOpcode::G_ATOMICRMW_ADD;
break;
case AtomicRMWInst::Sub:
Opcode = TargetOpcode::G_ATOMICRMW_SUB;
break;
case AtomicRMWInst::And:
Opcode = TargetOpcode::G_ATOMICRMW_AND;
break;
case AtomicRMWInst::Nand:
Opcode = TargetOpcode::G_ATOMICRMW_NAND;
break;
case AtomicRMWInst::Or:
Opcode = TargetOpcode::G_ATOMICRMW_OR;
break;
case AtomicRMWInst::Xor:
Opcode = TargetOpcode::G_ATOMICRMW_XOR;
break;
case AtomicRMWInst::Max:
Opcode = TargetOpcode::G_ATOMICRMW_MAX;
break;
case AtomicRMWInst::Min:
Opcode = TargetOpcode::G_ATOMICRMW_MIN;
break;
case AtomicRMWInst::UMax:
Opcode = TargetOpcode::G_ATOMICRMW_UMAX;
break;
case AtomicRMWInst::UMin:
Opcode = TargetOpcode::G_ATOMICRMW_UMIN;
break;
case AtomicRMWInst::FAdd:
Opcode = TargetOpcode::G_ATOMICRMW_FADD;
break;
case AtomicRMWInst::FSub:
Opcode = TargetOpcode::G_ATOMICRMW_FSUB;
break;
}
MIRBuilder.buildAtomicRMW(
Opcode, Res, Addr, Val,
*MF->getMachineMemOperand(MachinePointerInfo(I.getPointerOperand()),
Flags, DL->getTypeStoreSize(ResType),
getMemOpAlignment(I), AAMDNodes(), nullptr,
I.getSyncScopeID(), I.getOrdering()));
return true;
}
bool IRTranslator::translateFence(const User &U,
MachineIRBuilder &MIRBuilder) {
const FenceInst &Fence = cast<FenceInst>(U);
MIRBuilder.buildFence(static_cast<unsigned>(Fence.getOrdering()),
Fence.getSyncScopeID());
return true;
}
void IRTranslator::finishPendingPhis() {
#ifndef NDEBUG
DILocationVerifier Verifier;
GISelObserverWrapper WrapperObserver(&Verifier);
RAIIDelegateInstaller DelInstall(*MF, &WrapperObserver);
#endif // ifndef NDEBUG
for (auto &Phi : PendingPHIs) {
const PHINode *PI = Phi.first;
ArrayRef<MachineInstr *> ComponentPHIs = Phi.second;
MachineBasicBlock *PhiMBB = ComponentPHIs[0]->getParent();
EntryBuilder->setDebugLoc(PI->getDebugLoc());
#ifndef NDEBUG
Verifier.setCurrentInst(PI);
#endif // ifndef NDEBUG
SmallSet<const MachineBasicBlock *, 16> SeenPreds;
for (unsigned i = 0; i < PI->getNumIncomingValues(); ++i) {
auto IRPred = PI->getIncomingBlock(i);
ArrayRef<Register> ValRegs = getOrCreateVRegs(*PI->getIncomingValue(i));
for (auto Pred : getMachinePredBBs({IRPred, PI->getParent()})) {
if (SeenPreds.count(Pred) || !PhiMBB->isPredecessor(Pred))
continue;
SeenPreds.insert(Pred);
for (unsigned j = 0; j < ValRegs.size(); ++j) {
MachineInstrBuilder MIB(*MF, ComponentPHIs[j]);
MIB.addUse(ValRegs[j]);
MIB.addMBB(Pred);
}
}
}
}
}
bool IRTranslator::valueIsSplit(const Value &V,
SmallVectorImpl<uint64_t> *Offsets) {
SmallVector<LLT, 4> SplitTys;
if (Offsets && !Offsets->empty())
Offsets->clear();
computeValueLLTs(*DL, *V.getType(), SplitTys, Offsets);
return SplitTys.size() > 1;
}
bool IRTranslator::translate(const Instruction &Inst) {
CurBuilder->setDebugLoc(Inst.getDebugLoc());
// We only emit constants into the entry block from here. To prevent jumpy
// debug behaviour set the line to 0.
if (const DebugLoc &DL = Inst.getDebugLoc())
EntryBuilder->setDebugLoc(
DebugLoc::get(0, 0, DL.getScope(), DL.getInlinedAt()));
else
EntryBuilder->setDebugLoc(DebugLoc());
switch (Inst.getOpcode()) {
#define HANDLE_INST(NUM, OPCODE, CLASS) \
case Instruction::OPCODE: \
return translate##OPCODE(Inst, *CurBuilder.get());
#include "llvm/IR/Instruction.def"
default:
return false;
}
}
bool IRTranslator::translate(const Constant &C, Register Reg) {
if (auto CI = dyn_cast<ConstantInt>(&C))
EntryBuilder->buildConstant(Reg, *CI);
else if (auto CF = dyn_cast<ConstantFP>(&C))
EntryBuilder->buildFConstant(Reg, *CF);
else if (isa<UndefValue>(C))
EntryBuilder->buildUndef(Reg);
else if (isa<ConstantPointerNull>(C)) {
// As we are trying to build a constant val of 0 into a pointer,
// insert a cast to make them correct with respect to types.
unsigned NullSize = DL->getTypeSizeInBits(C.getType());
auto *ZeroTy = Type::getIntNTy(C.getContext(), NullSize);
auto *ZeroVal = ConstantInt::get(ZeroTy, 0);
Register ZeroReg = getOrCreateVReg(*ZeroVal);
EntryBuilder->buildCast(Reg, ZeroReg);
} else if (auto GV = dyn_cast<GlobalValue>(&C))
EntryBuilder->buildGlobalValue(Reg, GV);
else if (auto CAZ = dyn_cast<ConstantAggregateZero>(&C)) {
if (!CAZ->getType()->isVectorTy())
return false;
// Return the scalar if it is a <1 x Ty> vector.
if (CAZ->getNumElements() == 1)
return translate(*CAZ->getElementValue(0u), Reg);
SmallVector<Register, 4> Ops;
for (unsigned i = 0; i < CAZ->getNumElements(); ++i) {
Constant &Elt = *CAZ->getElementValue(i);
Ops.push_back(getOrCreateVReg(Elt));
}
EntryBuilder->buildBuildVector(Reg, Ops);
} else if (auto CV = dyn_cast<ConstantDataVector>(&C)) {
// Return the scalar if it is a <1 x Ty> vector.
if (CV->getNumElements() == 1)
return translate(*CV->getElementAsConstant(0), Reg);
SmallVector<Register, 4> Ops;
for (unsigned i = 0; i < CV->getNumElements(); ++i) {
Constant &Elt = *CV->getElementAsConstant(i);
Ops.push_back(getOrCreateVReg(Elt));
}
EntryBuilder->buildBuildVector(Reg, Ops);
} else if (auto CE = dyn_cast<ConstantExpr>(&C)) {
switch(CE->getOpcode()) {
#define HANDLE_INST(NUM, OPCODE, CLASS) \
case Instruction::OPCODE: \
return translate##OPCODE(*CE, *EntryBuilder.get());
#include "llvm/IR/Instruction.def"
default:
return false;
}
} else if (auto CV = dyn_cast<ConstantVector>(&C)) {
if (CV->getNumOperands() == 1)
return translate(*CV->getOperand(0), Reg);
SmallVector<Register, 4> Ops;
for (unsigned i = 0; i < CV->getNumOperands(); ++i) {
Ops.push_back(getOrCreateVReg(*CV->getOperand(i)));
}
EntryBuilder->buildBuildVector(Reg, Ops);
} else if (auto *BA = dyn_cast<BlockAddress>(&C)) {
EntryBuilder->buildBlockAddress(Reg, BA);
} else
return false;
return true;
}
void IRTranslator::finalizeBasicBlock() {
for (auto &JTCase : SL->JTCases) {
// Emit header first, if it wasn't already emitted.
if (!JTCase.first.Emitted)
emitJumpTableHeader(JTCase.second, JTCase.first, JTCase.first.HeaderBB);
emitJumpTable(JTCase.second, JTCase.second.MBB);
}
SL->JTCases.clear();
}
void IRTranslator::finalizeFunction() {
// Release the memory used by the different maps we
// needed during the translation.
PendingPHIs.clear();
VMap.reset();
FrameIndices.clear();
MachinePreds.clear();
// MachineIRBuilder::DebugLoc can outlive the DILocation it holds. Clear it
// to avoid accessing free’d memory (in runOnMachineFunction) and to avoid
// destroying it twice (in ~IRTranslator() and ~LLVMContext())
EntryBuilder.reset();
CurBuilder.reset();
FuncInfo.clear();
}
bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {
MF = &CurMF;
const Function &F = MF->getFunction();
if (F.empty())
return false;
GISelCSEAnalysisWrapper &Wrapper =
getAnalysis<GISelCSEAnalysisWrapperPass>().getCSEWrapper();
// Set the CSEConfig and run the analysis.
GISelCSEInfo *CSEInfo = nullptr;
TPC = &getAnalysis<TargetPassConfig>();
bool EnableCSE = EnableCSEInIRTranslator.getNumOccurrences()
? EnableCSEInIRTranslator
: TPC->isGISelCSEEnabled();
if (EnableCSE) {
EntryBuilder = std::make_unique<CSEMIRBuilder>(CurMF);
CSEInfo = &Wrapper.get(TPC->getCSEConfig());
EntryBuilder->setCSEInfo(CSEInfo);
CurBuilder = std::make_unique<CSEMIRBuilder>(CurMF);
CurBuilder->setCSEInfo(CSEInfo);
} else {
EntryBuilder = std::make_unique<MachineIRBuilder>();
CurBuilder = std::make_unique<MachineIRBuilder>();
}
CLI = MF->getSubtarget().getCallLowering();
CurBuilder->setMF(*MF);
EntryBuilder->setMF(*MF);
MRI = &MF->getRegInfo();
DL = &F.getParent()->getDataLayout();
ORE = std::make_unique<OptimizationRemarkEmitter>(&F);
FuncInfo.MF = MF;
FuncInfo.BPI = nullptr;
const auto &TLI = *MF->getSubtarget().getTargetLowering();
const TargetMachine &TM = MF->getTarget();
SL = std::make_unique<GISelSwitchLowering>(this, FuncInfo);
SL->init(TLI, TM, *DL);
EnableOpts = TM.getOptLevel() != CodeGenOpt::None && !skipFunction(F);
assert(PendingPHIs.empty() && "stale PHIs");
if (!DL->isLittleEndian()) {
// Currently we don't properly handle big endian code.
OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
F.getSubprogram(), &F.getEntryBlock());
R << "unable to translate in big endian mode";
reportTranslationError(*MF, *TPC, *ORE, R);
}
// Release the per-function state when we return, whether we succeeded or not.
auto FinalizeOnReturn = make_scope_exit([this]() { finalizeFunction(); });
// Setup a separate basic-block for the arguments and constants
MachineBasicBlock *EntryBB = MF->CreateMachineBasicBlock();
MF->push_back(EntryBB);
EntryBuilder->setMBB(*EntryBB);
DebugLoc DbgLoc = F.getEntryBlock().getFirstNonPHI()->getDebugLoc();
SwiftError.setFunction(CurMF);
SwiftError.createEntriesInEntryBlock(DbgLoc);
// Create all blocks, in IR order, to preserve the layout.
for (const BasicBlock &BB: F) {
auto *&MBB = BBToMBB[&BB];
MBB = MF->CreateMachineBasicBlock(&BB);
MF->push_back(MBB);
if (BB.hasAddressTaken())
MBB->setHasAddressTaken();
}
// Make our arguments/constants entry block fallthrough to the IR entry block.
EntryBB->addSuccessor(&getMBB(F.front()));
// Lower the actual args into this basic block.
SmallVector<ArrayRef<Register>, 8> VRegArgs;
for (const Argument &Arg: F.args()) {
if (DL->getTypeStoreSize(Arg.getType()) == 0)
continue; // Don't handle zero sized types.
ArrayRef<Register> VRegs = getOrCreateVRegs(Arg);
VRegArgs.push_back(VRegs);
if (Arg.hasSwiftErrorAttr()) {
assert(VRegs.size() == 1 && "Too many vregs for Swift error");
SwiftError.setCurrentVReg(EntryBB, SwiftError.getFunctionArg(), VRegs[0]);
}
}
if (!CLI->lowerFormalArguments(*EntryBuilder.get(), F, VRegArgs)) {
OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
F.getSubprogram(), &F.getEntryBlock());
R << "unable to lower arguments: " << ore::NV("Prototype", F.getType());
reportTranslationError(*MF, *TPC, *ORE, R);
return false;
}
// Need to visit defs before uses when translating instructions.
GISelObserverWrapper WrapperObserver;
if (EnableCSE && CSEInfo)
WrapperObserver.addObserver(CSEInfo);
{
ReversePostOrderTraversal<const Function *> RPOT(&F);
#ifndef NDEBUG
DILocationVerifier Verifier;
WrapperObserver.addObserver(&Verifier);
#endif // ifndef NDEBUG
RAIIDelegateInstaller DelInstall(*MF, &WrapperObserver);
for (const BasicBlock *BB : RPOT) {
MachineBasicBlock &MBB = getMBB(*BB);
// Set the insertion point of all the following translations to
// the end of this basic block.
CurBuilder->setMBB(MBB);
HasTailCall = false;
for (const Instruction &Inst : *BB) {
// If we translated a tail call in the last step, then we know
// everything after the call is either a return, or something that is
// handled by the call itself. (E.g. a lifetime marker or assume
// intrinsic.) In this case, we should stop translating the block and
// move on.
if (HasTailCall)
break;
#ifndef NDEBUG
Verifier.setCurrentInst(&Inst);
#endif // ifndef NDEBUG
if (translate(Inst))
continue;
OptimizationRemarkMissed R("gisel-irtranslator", "GISelFailure",
Inst.getDebugLoc(), BB);
R << "unable to translate instruction: " << ore::NV("Opcode", &Inst);
if (ORE->allowExtraAnalysis("gisel-irtranslator")) {
std::string InstStrStorage;
raw_string_ostream InstStr(InstStrStorage);
InstStr << Inst;
R << ": '" << InstStr.str() << "'";
}
reportTranslationError(*MF, *TPC, *ORE, R);
return false;
}
finalizeBasicBlock();
}
#ifndef NDEBUG
WrapperObserver.removeObserver(&Verifier);
#endif
}
finishPendingPhis();
SwiftError.propagateVRegs();
// Merge the argument lowering and constants block with its single
// successor, the LLVM-IR entry block. We want the basic block to
// be maximal.
assert(EntryBB->succ_size() == 1 &&
"Custom BB used for lowering should have only one successor");
// Get the successor of the current entry block.
MachineBasicBlock &NewEntryBB = **EntryBB->succ_begin();
assert(NewEntryBB.pred_size() == 1 &&
"LLVM-IR entry block has a predecessor!?");
// Move all the instruction from the current entry block to the
// new entry block.
NewEntryBB.splice(NewEntryBB.begin(), EntryBB, EntryBB->begin(),
EntryBB->end());
// Update the live-in information for the new entry block.
for (const MachineBasicBlock::RegisterMaskPair &LiveIn : EntryBB->liveins())
NewEntryBB.addLiveIn(LiveIn);
NewEntryBB.sortUniqueLiveIns();
// Get rid of the now empty basic block.
EntryBB->removeSuccessor(&NewEntryBB);
MF->remove(EntryBB);
MF->DeleteMachineBasicBlock(EntryBB);
assert(&MF->front() == &NewEntryBB &&
"New entry wasn't next in the list of basic block!");
// Initialize stack protector information.
StackProtector &SP = getAnalysis<StackProtector>();
SP.copyToMachineFrameInfo(MF->getFrameInfo());
return false;
}
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