//===----------------------------------------------------------------------===//
#include "ARM.h"
-#include "ARMTargetMachine.h"
#include "ARMFrameLowering.h"
+#include "ARMTargetMachine.h"
#include "ARMTargetObjectFile.h"
+#include "ARMTargetTransformInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
+#include "llvm/IR/LegacyPassManager.h"
#include "llvm/MC/MCAsmInfo.h"
-#include "llvm/PassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/TargetRegistry.h"
" to make use of cmpxchg flow-based information"),
cl::init(true));
+static cl::opt<bool>
+EnableARMLoadStoreOpt("arm-load-store-opt", cl::Hidden,
+ cl::desc("Enable ARM load/store optimization pass"),
+ cl::init(true));
+
+// FIXME: Unify control over GlobalMerge.
+static cl::opt<cl::boolOrDefault>
+EnableGlobalMerge("arm-global-merge", cl::Hidden,
+ cl::desc("Enable the global merge pass"));
+
extern "C" void LLVMInitializeARMTarget() {
// Register the target.
RegisterTargetMachine<ARMLETargetMachine> X(TheARMLETarget);
return make_unique<ARMElfTargetObjectFile>();
}
+static ARMBaseTargetMachine::ARMABI
+computeTargetABI(const Triple &TT, StringRef CPU,
+ const TargetOptions &Options) {
+ if (Options.MCOptions.getABIName().startswith("aapcs"))
+ return ARMBaseTargetMachine::ARM_ABI_AAPCS;
+ else if (Options.MCOptions.getABIName().startswith("apcs"))
+ return ARMBaseTargetMachine::ARM_ABI_APCS;
+
+ assert(Options.MCOptions.getABIName().empty() &&
+ "Unknown target-abi option!");
+
+ ARMBaseTargetMachine::ARMABI TargetABI =
+ ARMBaseTargetMachine::ARM_ABI_UNKNOWN;
+
+ // FIXME: This is duplicated code from the front end and should be unified.
+ if (TT.isOSBinFormatMachO()) {
+ if (TT.getEnvironment() == llvm::Triple::EABI ||
+ (TT.getOS() == llvm::Triple::UnknownOS && TT.isOSBinFormatMachO()) ||
+ CPU.startswith("cortex-m")) {
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
+ } else {
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_APCS;
+ }
+ } else if (TT.isOSWindows()) {
+ // FIXME: this is invalid for WindowsCE
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
+ } else {
+ // Select the default based on the platform.
+ switch (TT.getEnvironment()) {
+ case llvm::Triple::Android:
+ case llvm::Triple::GNUEABI:
+ case llvm::Triple::GNUEABIHF:
+ case llvm::Triple::EABIHF:
+ case llvm::Triple::EABI:
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
+ break;
+ case llvm::Triple::GNU:
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_APCS;
+ break;
+ default:
+ if (TT.isOSNetBSD())
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_APCS;
+ else
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
+ break;
+ }
+ }
+
+ return TargetABI;
+}
+
+static std::string computeDataLayout(const Triple &TT, StringRef CPU,
+ const TargetOptions &Options,
+ bool isLittle) {
+ auto ABI = computeTargetABI(TT, CPU, Options);
+ std::string Ret = "";
+
+ if (isLittle)
+ // Little endian.
+ Ret += "e";
+ else
+ // Big endian.
+ Ret += "E";
+
+ Ret += DataLayout::getManglingComponent(TT);
+
+ // Pointers are 32 bits and aligned to 32 bits.
+ Ret += "-p:32:32";
+
+ // ABIs other than APCS have 64 bit integers with natural alignment.
+ if (ABI != ARMBaseTargetMachine::ARM_ABI_APCS)
+ Ret += "-i64:64";
+
+ // We have 64 bits floats. The APCS ABI requires them to be aligned to 32
+ // bits, others to 64 bits. We always try to align to 64 bits.
+ if (ABI == ARMBaseTargetMachine::ARM_ABI_APCS)
+ Ret += "-f64:32:64";
+
+ // We have 128 and 64 bit vectors. The APCS ABI aligns them to 32 bits, others
+ // to 64. We always ty to give them natural alignment.
+ if (ABI == ARMBaseTargetMachine::ARM_ABI_APCS)
+ Ret += "-v64:32:64-v128:32:128";
+ else
+ Ret += "-v128:64:128";
+
+ // Try to align aggregates to 32 bits (the default is 64 bits, which has no
+ // particular hardware support on 32-bit ARM).
+ Ret += "-a:0:32";
+
+ // Integer registers are 32 bits.
+ Ret += "-n32";
+
+ // The stack is 128 bit aligned on NaCl, 64 bit aligned on AAPCS and 32 bit
+ // aligned everywhere else.
+ if (TT.isOSNaCl())
+ Ret += "-S128";
+ else if (ABI == ARMBaseTargetMachine::ARM_ABI_AAPCS)
+ Ret += "-S64";
+ else
+ Ret += "-S32";
+
+ return Ret;
+}
+
/// TargetMachine ctor - Create an ARM architecture model.
///
-ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, StringRef TT,
+ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL, bool isLittle)
- : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
- TLOF(createTLOF(Triple(getTargetTriple()))),
+ : LLVMTargetMachine(T, computeDataLayout(TT, CPU, Options, isLittle), TT,
+ CPU, FS, Options, RM, CM, OL),
+ TargetABI(computeTargetABI(TT, CPU, Options)),
+ TLOF(createTLOF(getTargetTriple())),
Subtarget(TT, CPU, FS, *this, isLittle), isLittle(isLittle) {
// Default to triple-appropriate float ABI
const ARMSubtarget *
ARMBaseTargetMachine::getSubtargetImpl(const Function &F) const {
- AttributeSet FnAttrs = F.getAttributes();
- Attribute CPUAttr =
- FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-cpu");
- Attribute FSAttr =
- FnAttrs.getAttribute(AttributeSet::FunctionIndex, "target-features");
+ Attribute CPUAttr = F.getFnAttribute("target-cpu");
+ Attribute FSAttr = F.getFnAttribute("target-features");
std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
? CPUAttr.getValueAsString().str()
// function before we can generate a subtarget. We also need to use
// it as a key for the subtarget since that can be the only difference
// between two functions.
- Attribute SFAttr =
- FnAttrs.getAttribute(AttributeSet::FunctionIndex, "use-soft-float");
- bool SoftFloat = !SFAttr.hasAttribute(Attribute::None)
- ? SFAttr.getValueAsString() == "true"
- : Options.UseSoftFloat;
-
- auto &I = SubtargetMap[CPU + FS + (SoftFloat ? "use-soft-float=true"
- : "use-soft-float=false")];
+ bool SoftFloat =
+ F.hasFnAttribute("use-soft-float") &&
+ F.getFnAttribute("use-soft-float").getValueAsString() == "true";
+ // If the soft float attribute is set on the function turn on the soft float
+ // subtarget feature.
+ if (SoftFloat)
+ FS += FS.empty() ? "+soft-float" : ",+soft-float";
+
+ 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
return I.get();
}
-void ARMBaseTargetMachine::addAnalysisPasses(PassManagerBase &PM) {
- // Add first the target-independent BasicTTI pass, then our ARM pass. This
- // allows the ARM pass to delegate to the target independent layer when
- // appropriate.
- PM.add(createBasicTargetTransformInfoPass(this));
- PM.add(createARMTargetTransformInfoPass(this));
+TargetIRAnalysis ARMBaseTargetMachine::getTargetIRAnalysis() {
+ return TargetIRAnalysis(
+ [this](Function &F) { return TargetTransformInfo(ARMTTIImpl(this, F)); });
}
void ARMTargetMachine::anchor() { }
-ARMTargetMachine::ARMTargetMachine(const Target &T, StringRef TT, StringRef CPU,
- StringRef FS, const TargetOptions &Options,
+ARMTargetMachine::ARMTargetMachine(const Target &T, const Triple &TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL, bool isLittle)
: ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, isLittle) {
void ARMLETargetMachine::anchor() { }
-ARMLETargetMachine::ARMLETargetMachine(const Target &T, StringRef TT,
+ARMLETargetMachine::ARMLETargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
void ARMBETargetMachine::anchor() { }
-ARMBETargetMachine::ARMBETargetMachine(const Target &T, StringRef TT,
+ARMBETargetMachine::ARMBETargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
void ThumbTargetMachine::anchor() { }
-ThumbTargetMachine::ThumbTargetMachine(const Target &T, StringRef TT,
+ThumbTargetMachine::ThumbTargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
CodeGenOpt::Level OL, bool isLittle)
- : ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL,
- isLittle) {
+ : ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, isLittle) {
initAsmInfo();
}
void ThumbLETargetMachine::anchor() { }
-ThumbLETargetMachine::ThumbLETargetMachine(const Target &T, StringRef TT,
+ThumbLETargetMachine::ThumbLETargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
void ThumbBETargetMachine::anchor() { }
-ThumbBETargetMachine::ThumbBETargetMachine(const Target &T, StringRef TT,
+ThumbBETargetMachine::ThumbBETargetMachine(const Target &T, const Triple &TT,
StringRef CPU, StringRef FS,
const TargetOptions &Options,
Reloc::Model RM, CodeModel::Model CM,
return getTM<ARMBaseTargetMachine>();
}
- const ARMSubtarget &getARMSubtarget() const {
- return *getARMTargetMachine().getSubtargetImpl();
- }
-
void addIRPasses() override;
bool addPreISel() override;
bool addInstSelector() override;
// 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.
- const ARMSubtarget *Subtarget = &getARMSubtarget();
- if (Subtarget->hasAnyDataBarrier() && !Subtarget->isThumb1Only())
- if (TM->getOptLevel() != CodeGenOpt::None && EnableAtomicTidy)
- addPass(createCFGSimplificationPass());
+ if (TM->getOptLevel() != CodeGenOpt::None && EnableAtomicTidy)
+ addPass(createCFGSimplificationPass(-1, [this](const Function &F) {
+ const auto &ST = this->TM->getSubtarget<ARMSubtarget>(F);
+ return ST.hasAnyDataBarrier() && !ST.isThumb1Only();
+ }));
TargetPassConfig::addIRPasses();
+
+ // Match interleaved memory accesses to ldN/stN intrinsics.
+ if (TM->getOptLevel() != CodeGenOpt::None)
+ addPass(createInterleavedAccessPass(TM));
}
bool ARMPassConfig::addPreISel() {
- if (TM->getOptLevel() != CodeGenOpt::None)
- addPass(createGlobalMergePass(TM));
+ if ((TM->getOptLevel() != CodeGenOpt::None &&
+ EnableGlobalMerge == cl::BOU_UNSET) ||
+ EnableGlobalMerge == cl::BOU_TRUE) {
+ // FIXME: This is using the thumb1 only constant value for
+ // maximal global offset for merging globals. We may want
+ // to look into using the old value for non-thumb1 code of
+ // 4095 based on the TargetMachine, but this starts to become
+ // tricky when doing code gen per function.
+ bool OnlyOptimizeForSize = (TM->getOptLevel() < CodeGenOpt::Aggressive) &&
+ (EnableGlobalMerge == cl::BOU_UNSET);
+ // Merging of extern globals is enabled by default on non-Mach-O as we
+ // expect it to be generally either beneficial or harmless. On Mach-O it
+ // is disabled as we emit the .subsections_via_symbols directive which
+ // means that merging extern globals is not safe.
+ bool MergeExternalByDefault = !TM->getTargetTriple().isOSBinFormatMachO();
+ addPass(createGlobalMergePass(TM, 127, OnlyOptimizeForSize,
+ MergeExternalByDefault));
+ }
return false;
}
bool ARMPassConfig::addInstSelector() {
addPass(createARMISelDag(getARMTargetMachine(), getOptLevel()));
- const ARMSubtarget *Subtarget = &getARMSubtarget();
- if (Subtarget->isTargetELF() && !Subtarget->isThumb1Only() &&
- TM->Options.EnableFastISel)
+ if (TM->getTargetTriple().isOSBinFormatELF() && TM->Options.EnableFastISel)
addPass(createARMGlobalBaseRegPass());
return false;
}
void ARMPassConfig::addPreRegAlloc() {
- if (getOptLevel() != CodeGenOpt::None)
- addPass(createARMLoadStoreOptimizationPass(true), false);
- if (getOptLevel() != CodeGenOpt::None && getARMSubtarget().isCortexA9())
- addPass(createMLxExpansionPass(), false);
- // Since the A15SDOptimizer pass can insert VDUP instructions, it can only be
- // enabled when NEON is available.
- if (getOptLevel() != CodeGenOpt::None && getARMSubtarget().isCortexA15() &&
- getARMSubtarget().hasNEON() && !DisableA15SDOptimization) {
- addPass(createA15SDOptimizerPass());
+ if (getOptLevel() != CodeGenOpt::None) {
+ addPass(createMLxExpansionPass());
+
+ if (EnableARMLoadStoreOpt)
+ addPass(createARMLoadStoreOptimizationPass(/* pre-register alloc */ true));
+
+ if (!DisableA15SDOptimization)
+ addPass(createA15SDOptimizerPass());
}
}
void ARMPassConfig::addPreSched2() {
if (getOptLevel() != CodeGenOpt::None) {
- addPass(createARMLoadStoreOptimizationPass(), false);
+ if (EnableARMLoadStoreOpt)
+ addPass(createARMLoadStoreOptimizationPass());
- if (getARMSubtarget().hasNEON())
- addPass(createExecutionDependencyFixPass(&ARM::DPRRegClass), false);
+ addPass(createExecutionDependencyFixPass(&ARM::DPRRegClass));
}
// Expand some pseudo instructions into multiple instructions to allow
// proper scheduling.
- addPass(createARMExpandPseudoPass(), false);
+ addPass(createARMExpandPseudoPass());
if (getOptLevel() != CodeGenOpt::None) {
- if (!getARMSubtarget().isThumb1Only()) {
- // in v8, IfConversion depends on Thumb instruction widths
- if (getARMSubtarget().restrictIT() &&
- !getARMSubtarget().prefers32BitThumb())
- addPass(createThumb2SizeReductionPass(), false);
- addPass(&IfConverterID, false);
- }
+ // in v8, IfConversion depends on Thumb instruction widths
+ addPass(createThumb2SizeReductionPass([this](const Function &F) {
+ return this->TM->getSubtarget<ARMSubtarget>(F).restrictIT();
+ }));
+
+ addPass(createIfConverter([this](const Function &F) {
+ return !this->TM->getSubtarget<ARMSubtarget>(F).isThumb1Only();
+ }));
}
- if (getARMSubtarget().isThumb2())
- addPass(createThumb2ITBlockPass());
+ addPass(createThumb2ITBlockPass());
}
void ARMPassConfig::addPreEmitPass() {
- if (getARMSubtarget().isThumb2()) {
- if (!getARMSubtarget().prefers32BitThumb())
- addPass(createThumb2SizeReductionPass(), false);
+ addPass(createThumb2SizeReductionPass());
- // Constant island pass work on unbundled instructions.
- addPass(&UnpackMachineBundlesID, false);
- }
+ // Constant island pass work on unbundled instructions.
+ addPass(createUnpackMachineBundles([this](const Function &F) {
+ return this->TM->getSubtarget<ARMSubtarget>(F).isThumb2();
+ }));
+
+ // Don't optimize barriers at -O0.
+ if (getOptLevel() != CodeGenOpt::None)
+ addPass(createARMOptimizeBarriersPass());
- addPass(createARMOptimizeBarriersPass(), false);
addPass(createARMConstantIslandPass());
}
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