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llvm-project/llvm/lib/Target/AArch64/AArch64TargetMachine.cpp

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//===-- AArch64TargetMachine.cpp - Define TargetMachine for AArch64 -------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#include "AArch64TargetMachine.h"
#include "AArch64.h"
#include "AArch64MacroFusion.h"
#include "AArch64Subtarget.h"
#include "AArch64TargetObjectFile.h"
#include "AArch64TargetTransformInfo.h"
#include "MCTargetDesc/AArch64MCTargetDesc.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/CodeGen/GlobalISel/IRTranslator.h"
#include "llvm/CodeGen/GlobalISel/InstructionSelect.h"
#include "llvm/CodeGen/GlobalISel/Legalizer.h"
#include "llvm/CodeGen/GlobalISel/Localizer.h"
#include "llvm/CodeGen/GlobalISel/RegBankSelect.h"
#include "llvm/CodeGen/MachineScheduler.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/TargetPassConfig.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Function.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/Pass.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Transforms/Scalar.h"
#include <memory>
#include <string>
using namespace llvm;
static cl::opt<bool> EnableCCMP("aarch64-enable-ccmp",
cl::desc("Enable the CCMP formation pass"),
cl::init(true), cl::Hidden);
static cl::opt<bool>
EnableCondBrTuning("aarch64-enable-cond-br-tune",
cl::desc("Enable the conditional branch tuning pass"),
cl::init(true), cl::Hidden);
static cl::opt<bool> EnableMCR("aarch64-enable-mcr",
cl::desc("Enable the machine combiner pass"),
cl::init(true), cl::Hidden);
static cl::opt<bool> EnableStPairSuppress("aarch64-enable-stp-suppress",
cl::desc("Suppress STP for AArch64"),
cl::init(true), cl::Hidden);
static cl::opt<bool> EnableAdvSIMDScalar(
"aarch64-enable-simd-scalar",
cl::desc("Enable use of AdvSIMD scalar integer instructions"),
cl::init(false), cl::Hidden);
static cl::opt<bool>
EnablePromoteConstant("aarch64-enable-promote-const",
cl::desc("Enable the promote constant pass"),
cl::init(true), cl::Hidden);
static cl::opt<bool> EnableCollectLOH(
"aarch64-enable-collect-loh",
cl::desc("Enable the pass that emits the linker optimization hints (LOH)"),
cl::init(true), cl::Hidden);
static cl::opt<bool>
EnableDeadRegisterElimination("aarch64-enable-dead-defs", cl::Hidden,
cl::desc("Enable the pass that removes dead"
" definitons and replaces stores to"
" them with stores to the zero"
" register"),
cl::init(true));
static cl::opt<bool> EnableRedundantCopyElimination(
"aarch64-enable-copyelim",
cl::desc("Enable the redundant copy elimination pass"), cl::init(true),
cl::Hidden);
static cl::opt<bool> EnableLoadStoreOpt("aarch64-enable-ldst-opt",
cl::desc("Enable the load/store pair"
" optimization pass"),
cl::init(true), cl::Hidden);
static cl::opt<bool> EnableAtomicTidy(
"aarch64-enable-atomic-cfg-tidy", cl::Hidden,
cl::desc("Run SimplifyCFG after expanding atomic operations"
" to make use of cmpxchg flow-based information"),
cl::init(true));
static cl::opt<bool>
EnableEarlyIfConversion("aarch64-enable-early-ifcvt", cl::Hidden,
cl::desc("Run early if-conversion"),
cl::init(true));
static cl::opt<bool>
EnableCondOpt("aarch64-enable-condopt",
cl::desc("Enable the condition optimizer pass"),
cl::init(true), cl::Hidden);
static cl::opt<bool>
EnableA53Fix835769("aarch64-fix-cortex-a53-835769", cl::Hidden,
cl::desc("Work around Cortex-A53 erratum 835769"),
cl::init(false));
static cl::opt<bool>
EnableGEPOpt("aarch64-enable-gep-opt", cl::Hidden,
cl::desc("Enable optimizations on complex GEPs"),
cl::init(false));
static cl::opt<bool>
BranchRelaxation("aarch64-enable-branch-relax", cl::Hidden, cl::init(true),
cl::desc("Relax out of range conditional branches"));
// FIXME: Unify control over GlobalMerge.
static cl::opt<cl::boolOrDefault>
EnableGlobalMerge("aarch64-enable-global-merge", cl::Hidden,
cl::desc("Enable the global merge pass"));
static cl::opt<bool>
EnableLoopDataPrefetch("aarch64-enable-loop-data-prefetch", cl::Hidden,
cl::desc("Enable the loop data prefetch pass"),
cl::init(true));
static cl::opt<int> EnableGlobalISelAtO(
"aarch64-enable-global-isel-at-O", cl::Hidden,
cl::desc("Enable GlobalISel at or below an opt level (-1 to disable)"),
cl::init(0));
static cl::opt<bool> EnableFalkorHWPFFix("aarch64-enable-falkor-hwpf-fix",
cl::init(true), cl::Hidden);
static cl::opt<bool>
EnableBranchTargets("aarch64-enable-branch-targets", cl::Hidden,
cl::desc("Enable the AAcrh64 branch target pass"),
cl::init(true));
extern "C" void LLVMInitializeAArch64Target() {
// Register the target.
RegisterTargetMachine<AArch64leTargetMachine> X(getTheAArch64leTarget());
RegisterTargetMachine<AArch64beTargetMachine> Y(getTheAArch64beTarget());
RegisterTargetMachine<AArch64leTargetMachine> Z(getTheARM64Target());
auto PR = PassRegistry::getPassRegistry();
initializeGlobalISel(*PR);
initializeAArch64A53Fix835769Pass(*PR);
initializeAArch64A57FPLoadBalancingPass(*PR);
initializeAArch64AdvSIMDScalarPass(*PR);
initializeAArch64BranchTargetsPass(*PR);
initializeAArch64CollectLOHPass(*PR);
initializeAArch64ConditionalComparesPass(*PR);
initializeAArch64ConditionOptimizerPass(*PR);
initializeAArch64DeadRegisterDefinitionsPass(*PR);
initializeAArch64ExpandPseudoPass(*PR);
initializeAArch64LoadStoreOptPass(*PR);
initializeAArch64SIMDInstrOptPass(*PR);
initializeAArch64PreLegalizerCombinerPass(*PR);
initializeAArch64PromoteConstantPass(*PR);
initializeAArch64RedundantCopyEliminationPass(*PR);
initializeAArch64StorePairSuppressPass(*PR);
initializeFalkorHWPFFixPass(*PR);
initializeFalkorMarkStridedAccessesLegacyPass(*PR);
initializeLDTLSCleanupPass(*PR);
}
//===----------------------------------------------------------------------===//
// AArch64 Lowering public interface.
//===----------------------------------------------------------------------===//
static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
if (TT.isOSBinFormatMachO())
return llvm::make_unique<AArch64_MachoTargetObjectFile>();
if (TT.isOSBinFormatCOFF())
return llvm::make_unique<AArch64_COFFTargetObjectFile>();
return llvm::make_unique<AArch64_ELFTargetObjectFile>();
}
// Helper function to build a DataLayout string
static std::string computeDataLayout(const Triple &TT,
const MCTargetOptions &Options,
bool LittleEndian) {
if (Options.getABIName() == "ilp32")
return "e-m:e-p:32:32-i8:8-i16:16-i64:64-S128";
if (TT.isOSBinFormatMachO())
return "e-m:o-i64:64-i128:128-n32:64-S128";
if (TT.isOSBinFormatCOFF())
return "e-m:w-p:64:64-i32:32-i64:64-i128:128-n32:64-S128";
if (LittleEndian)
return "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128";
return "E-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128";
}
static Reloc::Model getEffectiveRelocModel(const Triple &TT,
Optional<Reloc::Model> RM) {
// AArch64 Darwin is always PIC.
if (TT.isOSDarwin())
return Reloc::PIC_;
// On ELF platforms the default static relocation model has a smart enough
// linker to cope with referencing external symbols defined in a shared
// library. Hence DynamicNoPIC doesn't need to be promoted to PIC.
if (!RM.hasValue() || *RM == Reloc::DynamicNoPIC)
return Reloc::Static;
return *RM;
}
static CodeModel::Model getEffectiveCodeModel(const Triple &TT,
Optional<CodeModel::Model> CM,
bool JIT) {
if (CM) {
if (*CM != CodeModel::Small && *CM != CodeModel::Tiny &&
*CM != CodeModel::Large) {
if (!TT.isOSFuchsia())
report_fatal_error(
"Only small, tiny and large code models are allowed on AArch64");
else if (*CM != CodeModel::Kernel)
report_fatal_error("Only small, tiny, kernel, and large code models "
"are allowed on AArch64");
} else if (*CM == CodeModel::Tiny && !TT.isOSBinFormatELF())
report_fatal_error("tiny code model is only supported on ELF");
return *CM;
}
// The default MCJIT memory managers make no guarantees about where they can
// find an executable page; JITed code needs to be able to refer to globals
// no matter how far away they are.
if (JIT)
return CodeModel::Large;
return CodeModel::Small;
}
/// Create an AArch64 architecture model.
///
AArch64TargetMachine::AArch64TargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Optional<Reloc::Model> RM,
Optional<CodeModel::Model> CM,
CodeGenOpt::Level OL, bool JIT,
bool LittleEndian)
: LLVMTargetMachine(T,
computeDataLayout(TT, Options.MCOptions, LittleEndian),
TT, CPU, FS, Options, getEffectiveRelocModel(TT, RM),
getEffectiveCodeModel(TT, CM, JIT), OL),
TLOF(createTLOF(getTargetTriple())), isLittle(LittleEndian) {
initAsmInfo();
if (TT.isOSBinFormatMachO()) {
this->Options.TrapUnreachable = true;
this->Options.NoTrapAfterNoreturn = true;
}
// Enable GlobalISel at or below EnableGlobalISelAt0.
if (getOptLevel() <= EnableGlobalISelAtO)
setGlobalISel(true);
// AArch64 supports the MachineOutliner.
setMachineOutliner(true);
// AArch64 supports default outlining behaviour.
setSupportsDefaultOutlining(true);
}
AArch64TargetMachine::~AArch64TargetMachine() = default;
const AArch64Subtarget *
AArch64TargetMachine::getSubtargetImpl(const Function &F) const {
Attribute CPUAttr = F.getFnAttribute("target-cpu");
Attribute FSAttr = F.getFnAttribute("target-features");
std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
? CPUAttr.getValueAsString().str()
: TargetCPU;
std::string FS = !FSAttr.hasAttribute(Attribute::None)
? FSAttr.getValueAsString().str()
: TargetFS;
auto &I = SubtargetMap[CPU + FS];
if (!I) {
// This needs to be done before we create a new subtarget since any
// creation will depend on the TM and the code generation flags on the
// function that reside in TargetOptions.
resetTargetOptions(F);
I = llvm::make_unique<AArch64Subtarget>(TargetTriple, CPU, FS, *this,
isLittle);
}
return I.get();
}
void AArch64leTargetMachine::anchor() { }
AArch64leTargetMachine::AArch64leTargetMachine(
const Target &T, const Triple &TT, StringRef CPU, StringRef FS,
const TargetOptions &Options, Optional<Reloc::Model> RM,
Optional<CodeModel::Model> CM, CodeGenOpt::Level OL, bool JIT)
: AArch64TargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, JIT, true) {}
void AArch64beTargetMachine::anchor() { }
AArch64beTargetMachine::AArch64beTargetMachine(
const Target &T, const Triple &TT, StringRef CPU, StringRef FS,
const TargetOptions &Options, Optional<Reloc::Model> RM,
Optional<CodeModel::Model> CM, CodeGenOpt::Level OL, bool JIT)
: AArch64TargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, JIT, false) {}
namespace {
/// AArch64 Code Generator Pass Configuration Options.
class AArch64PassConfig : public TargetPassConfig {
public:
AArch64PassConfig(AArch64TargetMachine &TM, PassManagerBase &PM)
: TargetPassConfig(TM, PM) {
if (TM.getOptLevel() != CodeGenOpt::None)
substitutePass(&PostRASchedulerID, &PostMachineSchedulerID);
}
AArch64TargetMachine &getAArch64TargetMachine() const {
return getTM<AArch64TargetMachine>();
}
ScheduleDAGInstrs *
createMachineScheduler(MachineSchedContext *C) const override {
const AArch64Subtarget &ST = C->MF->getSubtarget<AArch64Subtarget>();
ScheduleDAGMILive *DAG = createGenericSchedLive(C);
DAG->addMutation(createLoadClusterDAGMutation(DAG->TII, DAG->TRI));
DAG->addMutation(createStoreClusterDAGMutation(DAG->TII, DAG->TRI));
if (ST.hasFusion())
DAG->addMutation(createAArch64MacroFusionDAGMutation());
return DAG;
}
ScheduleDAGInstrs *
createPostMachineScheduler(MachineSchedContext *C) const override {
const AArch64Subtarget &ST = C->MF->getSubtarget<AArch64Subtarget>();
if (ST.hasFusion()) {
// Run the Macro Fusion after RA again since literals are expanded from
// pseudos then (v. addPreSched2()).
ScheduleDAGMI *DAG = createGenericSchedPostRA(C);
DAG->addMutation(createAArch64MacroFusionDAGMutation());
return DAG;
}
return nullptr;
}
void addIRPasses() override;
bool addPreISel() override;
bool addInstSelector() override;
bool addIRTranslator() override;
void addPreLegalizeMachineIR() override;
bool addLegalizeMachineIR() override;
bool addRegBankSelect() override;
void addPreGlobalInstructionSelect() override;
bool addGlobalInstructionSelect() override;
bool addILPOpts() override;
void addPreRegAlloc() override;
void addPostRegAlloc() override;
void addPreSched2() override;
void addPreEmitPass() override;
};
} // end anonymous namespace
TargetTransformInfo
AArch64TargetMachine::getTargetTransformInfo(const Function &F) {
return TargetTransformInfo(AArch64TTIImpl(this, F));
}
TargetPassConfig *AArch64TargetMachine::createPassConfig(PassManagerBase &PM) {
return new AArch64PassConfig(*this, PM);
}
void AArch64PassConfig::addIRPasses() {
// Always expand atomic operations, we don't deal with atomicrmw or cmpxchg
// ourselves.
addPass(createAtomicExpandPass());
// Cmpxchg instructions are often used with a subsequent comparison to
// determine whether it succeeded. We can exploit existing control-flow in
// ldrex/strex loops to simplify this, but it needs tidying up.
if (TM->getOptLevel() != CodeGenOpt::None && EnableAtomicTidy)
addPass(createCFGSimplificationPass(1, true, true, false, true));
// Run LoopDataPrefetch
//
// Run this before LSR to remove the multiplies involved in computing the
// pointer values N iterations ahead.
if (TM->getOptLevel() != CodeGenOpt::None) {
if (EnableLoopDataPrefetch)
addPass(createLoopDataPrefetchPass());
if (EnableFalkorHWPFFix)
addPass(createFalkorMarkStridedAccessesPass());
}
TargetPassConfig::addIRPasses();
// Match interleaved memory accesses to ldN/stN intrinsics.
if (TM->getOptLevel() != CodeGenOpt::None)
addPass(createInterleavedAccessPass());
if (TM->getOptLevel() == CodeGenOpt::Aggressive && EnableGEPOpt) {
// Call SeparateConstOffsetFromGEP pass to extract constants within indices
// and lower a GEP with multiple indices to either arithmetic operations or
// multiple GEPs with single index.
addPass(createSeparateConstOffsetFromGEPPass(true));
// Call EarlyCSE pass to find and remove subexpressions in the lowered
// result.
addPass(createEarlyCSEPass());
// Do loop invariant code motion in case part of the lowered result is
// invariant.
addPass(createLICMPass());
}
}
// Pass Pipeline Configuration
bool AArch64PassConfig::addPreISel() {
// Run promote constant before global merge, so that the promoted constants
// get a chance to be merged
if (TM->getOptLevel() != CodeGenOpt::None && EnablePromoteConstant)
addPass(createAArch64PromoteConstantPass());
// FIXME: On AArch64, this depends on the type.
// Basically, the addressable offsets are up to 4095 * Ty.getSizeInBytes().
// and the offset has to be a multiple of the related size in bytes.
if ((TM->getOptLevel() != CodeGenOpt::None &&
EnableGlobalMerge == cl::BOU_UNSET) ||
EnableGlobalMerge == cl::BOU_TRUE) {
bool OnlyOptimizeForSize = (TM->getOptLevel() < CodeGenOpt::Aggressive) &&
(EnableGlobalMerge == cl::BOU_UNSET);
addPass(createGlobalMergePass(TM, 4095, OnlyOptimizeForSize));
}
return false;
}
bool AArch64PassConfig::addInstSelector() {
addPass(createAArch64ISelDag(getAArch64TargetMachine(), getOptLevel()));
// For ELF, cleanup any local-dynamic TLS accesses (i.e. combine as many
// references to _TLS_MODULE_BASE_ as possible.
if (TM->getTargetTriple().isOSBinFormatELF() &&
getOptLevel() != CodeGenOpt::None)
addPass(createAArch64CleanupLocalDynamicTLSPass());
return false;
}
bool AArch64PassConfig::addIRTranslator() {
addPass(new IRTranslator());
return false;
}
void AArch64PassConfig::addPreLegalizeMachineIR() {
addPass(createAArch64PreLegalizeCombiner());
}
bool AArch64PassConfig::addLegalizeMachineIR() {
addPass(new Legalizer());
return false;
}
bool AArch64PassConfig::addRegBankSelect() {
addPass(new RegBankSelect());
return false;
}
void AArch64PassConfig::addPreGlobalInstructionSelect() {
// Workaround the deficiency of the fast register allocator.
if (TM->getOptLevel() == CodeGenOpt::None)
addPass(new Localizer());
}
bool AArch64PassConfig::addGlobalInstructionSelect() {
addPass(new InstructionSelect());
return false;
}
bool AArch64PassConfig::addILPOpts() {
if (EnableCondOpt)
addPass(createAArch64ConditionOptimizerPass());
if (EnableCCMP)
addPass(createAArch64ConditionalCompares());
if (EnableMCR)
addPass(&MachineCombinerID);
if (EnableCondBrTuning)
addPass(createAArch64CondBrTuning());
if (EnableEarlyIfConversion)
addPass(&EarlyIfConverterID);
if (EnableStPairSuppress)
addPass(createAArch64StorePairSuppressPass());
addPass(createAArch64SIMDInstrOptPass());
return true;
}
void AArch64PassConfig::addPreRegAlloc() {
// Change dead register definitions to refer to the zero register.
if (TM->getOptLevel() != CodeGenOpt::None && EnableDeadRegisterElimination)
addPass(createAArch64DeadRegisterDefinitions());
// Use AdvSIMD scalar instructions whenever profitable.
if (TM->getOptLevel() != CodeGenOpt::None && EnableAdvSIMDScalar) {
addPass(createAArch64AdvSIMDScalar());
// The AdvSIMD pass may produce copies that can be rewritten to
// be register coaleascer friendly.
addPass(&PeepholeOptimizerID);
}
}
void AArch64PassConfig::addPostRegAlloc() {
// Remove redundant copy instructions.
if (TM->getOptLevel() != CodeGenOpt::None && EnableRedundantCopyElimination)
addPass(createAArch64RedundantCopyEliminationPass());
if (TM->getOptLevel() != CodeGenOpt::None && usingDefaultRegAlloc())
// Improve performance for some FP/SIMD code for A57.
addPass(createAArch64A57FPLoadBalancing());
}
void AArch64PassConfig::addPreSched2() {
// Expand some pseudo instructions to allow proper scheduling.
addPass(createAArch64ExpandPseudoPass());
// Use load/store pair instructions when possible.
if (TM->getOptLevel() != CodeGenOpt::None) {
if (EnableLoadStoreOpt)
addPass(createAArch64LoadStoreOptimizationPass());
if (EnableFalkorHWPFFix)
addPass(createFalkorHWPFFixPass());
}
}
void AArch64PassConfig::addPreEmitPass() {
if (EnableA53Fix835769)
addPass(createAArch64A53Fix835769());
// Relax conditional branch instructions if they're otherwise out of
// range of their destination.
if (BranchRelaxation)
addPass(&BranchRelaxationPassID);
if (EnableBranchTargets)
addPass(createAArch64BranchTargetsPass());
if (TM->getOptLevel() != CodeGenOpt::None && EnableCollectLOH &&
TM->getTargetTriple().isOSBinFormatMachO())
addPass(createAArch64CollectLOHPass());
}
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