//
//===----------------------------------------------------------------------===//
-#include "ARMTargetMachine.h"
-#include "ARMFrameLowering.h"
#include "ARM.h"
-#include "llvm/PassManager.h"
+#include "ARMFrameLowering.h"
+#include "ARMTargetMachine.h"
+#include "ARMTargetObjectFile.h"
#include "llvm/CodeGen/Passes.h"
+#include "llvm/IR/Function.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"
#include "llvm/Target/TargetOptions.h"
+#include "llvm/Transforms/Scalar.h"
using namespace llvm;
static cl::opt<bool>
-EnableGlobalMerge("global-merge", cl::Hidden,
- cl::desc("Enable global merge pass"),
- cl::init(true));
+DisableA15SDOptimization("disable-a15-sd-optimization", cl::Hidden,
+ cl::desc("Inhibit optimization of S->D register accesses on A15"),
+ cl::init(false));
+
+static cl::opt<bool>
+EnableAtomicTidy("arm-atomic-cfg-tidy", cl::Hidden,
+ cl::desc("Run SimplifyCFG after expanding atomic operations"
+ " to make use of cmpxchg flow-based information"),
+ cl::init(true));
extern "C" void LLVMInitializeARMTarget() {
// Register the target.
- RegisterTargetMachine<ARMTargetMachine> X(TheARMTarget);
- RegisterTargetMachine<ThumbTargetMachine> Y(TheThumbTarget);
+ RegisterTargetMachine<ARMLETargetMachine> X(TheARMLETarget);
+ RegisterTargetMachine<ARMBETargetMachine> Y(TheARMBETarget);
+ RegisterTargetMachine<ThumbLETargetMachine> A(TheThumbLETarget);
+ RegisterTargetMachine<ThumbBETargetMachine> B(TheThumbBETarget);
+}
+
+static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
+ if (TT.isOSBinFormatMachO())
+ return make_unique<TargetLoweringObjectFileMachO>();
+ if (TT.isOSWindows())
+ return make_unique<TargetLoweringObjectFileCOFF>();
+ 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.getObjectFormat() == llvm::Triple::MachO) ||
+ 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.getOS() == llvm::Triple::NetBSD)
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_APCS;
+ else
+ TargetABI = ARMBaseTargetMachine::ARM_ABI_AAPCS;
+ break;
+ }
+ }
+
+ return TargetABI;
}
/// TargetMachine ctor - Create an ARM architecture model.
///
ARMBaseTargetMachine::ARMBaseTargetMachine(const Target &T, StringRef TT,
StringRef CPU, StringRef FS,
- Reloc::Model RM, CodeModel::Model CM)
- : LLVMTargetMachine(T, TT, CPU, FS, RM, CM),
- Subtarget(TT, CPU, FS),
- JITInfo(),
- InstrItins(Subtarget.getInstrItineraryData()) {
- // Default to soft float ABI
- if (FloatABIType == FloatABI::Default)
- FloatABIType = FloatABI::Soft;
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL, bool isLittle)
+ : LLVMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL),
+ TargetABI(computeTargetABI(Triple(TT), CPU, Options)),
+ TLOF(createTLOF(Triple(getTargetTriple()))),
+ Subtarget(TT, CPU, FS, *this, isLittle), isLittle(isLittle) {
+
+ // Default to triple-appropriate float ABI
+ if (Options.FloatABIType == FloatABI::Default)
+ this->Options.FloatABIType =
+ Subtarget.isTargetHardFloat() ? FloatABI::Hard : FloatABI::Soft;
}
-ARMTargetMachine::ARMTargetMachine(const Target &T, StringRef TT,
- StringRef CPU, StringRef FS,
- Reloc::Model RM, CodeModel::Model CM)
- : ARMBaseTargetMachine(T, TT, CPU, FS, RM, CM), InstrInfo(Subtarget),
- DataLayout(Subtarget.isAPCS_ABI() ?
- std::string("e-p:32:32-f64:32:64-i64:32:64-"
- "v128:32:128-v64:32:64-n32") :
- std::string("e-p:32:32-f64:64:64-i64:64:64-"
- "v128:64:128-v64:64:64-n32")),
- ELFWriterInfo(*this),
- TLInfo(*this),
- TSInfo(*this),
- FrameLowering(Subtarget) {
+ARMBaseTargetMachine::~ARMBaseTargetMachine() {}
+
+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");
+
+ std::string CPU = !CPUAttr.hasAttribute(Attribute::None)
+ ? CPUAttr.getValueAsString().str()
+ : TargetCPU;
+ std::string FS = !FSAttr.hasAttribute(Attribute::None)
+ ? FSAttr.getValueAsString().str()
+ : TargetFS;
+
+ // FIXME: This is related to the code below to reset the target options,
+ // we need to know whether or not the soft float flag is set on the
+ // 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")];
+ 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<ARMSubtarget>(TargetTriple, CPU, FS, *this, isLittle);
+ }
+ 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));
+}
+
+
+void ARMTargetMachine::anchor() { }
+
+ARMTargetMachine::ARMTargetMachine(const Target &T, StringRef 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) {
+ initAsmInfo();
if (!Subtarget.hasARMOps())
report_fatal_error("CPU: '" + Subtarget.getCPUString() + "' does not "
"support ARM mode execution!");
}
+void ARMLETargetMachine::anchor() { }
+
+ARMLETargetMachine::ARMLETargetMachine(const Target &T, StringRef TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL)
+ : ARMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true) {}
+
+void ARMBETargetMachine::anchor() { }
+
+ARMBETargetMachine::ARMBETargetMachine(const Target &T, StringRef TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL)
+ : ARMTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false) {}
+
+void ThumbTargetMachine::anchor() { }
+
ThumbTargetMachine::ThumbTargetMachine(const Target &T, StringRef TT,
StringRef CPU, StringRef FS,
- Reloc::Model RM, CodeModel::Model CM)
- : ARMBaseTargetMachine(T, TT, CPU, FS, RM, CM),
- InstrInfo(Subtarget.hasThumb2()
- ? ((ARMBaseInstrInfo*)new Thumb2InstrInfo(Subtarget))
- : ((ARMBaseInstrInfo*)new Thumb1InstrInfo(Subtarget))),
- DataLayout(Subtarget.isAPCS_ABI() ?
- std::string("e-p:32:32-f64:32:64-i64:32:64-"
- "i16:16:32-i8:8:32-i1:8:32-"
- "v128:32:128-v64:32:64-a:0:32-n32") :
- std::string("e-p:32:32-f64:64:64-i64:64:64-"
- "i16:16:32-i8:8:32-i1:8:32-"
- "v128:64:128-v64:64:64-a:0:32-n32")),
- ELFWriterInfo(*this),
- TLInfo(*this),
- TSInfo(*this),
- FrameLowering(Subtarget.hasThumb2()
- ? new ARMFrameLowering(Subtarget)
- : (ARMFrameLowering*)new Thumb1FrameLowering(Subtarget)) {
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL, bool isLittle)
+ : ARMBaseTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL,
+ isLittle) {
+ initAsmInfo();
+}
+
+void ThumbLETargetMachine::anchor() { }
+
+ThumbLETargetMachine::ThumbLETargetMachine(const Target &T, StringRef TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL)
+ : ThumbTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, true) {}
+
+void ThumbBETargetMachine::anchor() { }
+
+ThumbBETargetMachine::ThumbBETargetMachine(const Target &T, StringRef TT,
+ StringRef CPU, StringRef FS,
+ const TargetOptions &Options,
+ Reloc::Model RM, CodeModel::Model CM,
+ CodeGenOpt::Level OL)
+ : ThumbTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL, false) {}
+
+namespace {
+/// ARM Code Generator Pass Configuration Options.
+class ARMPassConfig : public TargetPassConfig {
+public:
+ ARMPassConfig(ARMBaseTargetMachine *TM, PassManagerBase &PM)
+ : TargetPassConfig(TM, PM) {}
+
+ ARMBaseTargetMachine &getARMTargetMachine() const {
+ return getTM<ARMBaseTargetMachine>();
+ }
+
+ const ARMSubtarget &getARMSubtarget() const {
+ return *getARMTargetMachine().getSubtargetImpl();
+ }
+
+ void addIRPasses() override;
+ bool addPreISel() override;
+ bool addInstSelector() override;
+ void addPreRegAlloc() override;
+ void addPreSched2() override;
+ void addPreEmitPass() override;
+};
+} // namespace
+
+TargetPassConfig *ARMBaseTargetMachine::createPassConfig(PassManagerBase &PM) {
+ return new ARMPassConfig(this, PM);
+}
+
+void ARMPassConfig::addIRPasses() {
+ if (TM->Options.ThreadModel == ThreadModel::Single)
+ addPass(createLowerAtomicPass());
+ else
+ addPass(createAtomicExpandPass(TM));
+
+ // 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());
+
+ TargetPassConfig::addIRPasses();
}
-bool ARMBaseTargetMachine::addPreISel(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel) {
- if (OptLevel != CodeGenOpt::None && EnableGlobalMerge)
- PM.add(createARMGlobalMergePass(getTargetLowering()));
+bool ARMPassConfig::addPreISel() {
+ if (TM->getOptLevel() != CodeGenOpt::None)
+ addPass(createGlobalMergePass(TM));
return false;
}
-bool ARMBaseTargetMachine::addInstSelector(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel) {
- PM.add(createARMISelDag(*this, OptLevel));
+bool ARMPassConfig::addInstSelector() {
+ addPass(createARMISelDag(getARMTargetMachine(), getOptLevel()));
+
+ const ARMSubtarget *Subtarget = &getARMSubtarget();
+ if (Subtarget->isTargetELF() && !Subtarget->isThumb1Only() &&
+ TM->Options.EnableFastISel)
+ addPass(createARMGlobalBaseRegPass());
return false;
}
-bool ARMBaseTargetMachine::addPreRegAlloc(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel) {
- // FIXME: temporarily disabling load / store optimization pass for Thumb1.
- if (OptLevel != CodeGenOpt::None && !Subtarget.isThumb1Only())
- PM.add(createARMLoadStoreOptimizationPass(true));
- if (OptLevel != CodeGenOpt::None && Subtarget.isCortexA9())
- PM.add(createMLxExpansionPass());
- if (getMCAsmInfo()->getExceptionHandlingType() == ExceptionHandling::SjLj)
- createARMSjLjLoweringPass();
- return true;
+void ARMPassConfig::addPreRegAlloc() {
+ if (getOptLevel() != CodeGenOpt::None)
+ addPass(createARMLoadStoreOptimizationPass(true));
+ if (getOptLevel() != CodeGenOpt::None && getARMSubtarget().isCortexA9())
+ addPass(createMLxExpansionPass());
+ // 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());
+ }
}
-bool ARMBaseTargetMachine::addPreSched2(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel) {
- // FIXME: temporarily disabling load / store optimization pass for Thumb1.
- if (OptLevel != CodeGenOpt::None) {
- if (!Subtarget.isThumb1Only())
- PM.add(createARMLoadStoreOptimizationPass());
- if (Subtarget.hasNEON())
- PM.add(createNEONMoveFixPass());
+void ARMPassConfig::addPreSched2() {
+ if (getOptLevel() != CodeGenOpt::None) {
+ addPass(createARMLoadStoreOptimizationPass());
+
+ if (getARMSubtarget().hasNEON())
+ addPass(createExecutionDependencyFixPass(&ARM::DPRRegClass));
}
// Expand some pseudo instructions into multiple instructions to allow
// proper scheduling.
- PM.add(createARMExpandPseudoPass());
+ addPass(createARMExpandPseudoPass());
- if (OptLevel != CodeGenOpt::None) {
- if (!Subtarget.isThumb1Only())
- PM.add(createIfConverterPass());
+ if (getOptLevel() != CodeGenOpt::None) {
+ if (!getARMSubtarget().isThumb1Only()) {
+ // in v8, IfConversion depends on Thumb instruction widths
+ if (getARMSubtarget().restrictIT() &&
+ !getARMSubtarget().prefers32BitThumb())
+ addPass(createThumb2SizeReductionPass());
+ addPass(&IfConverterID);
+ }
}
- if (Subtarget.isThumb2())
- PM.add(createThumb2ITBlockPass());
-
- return true;
+ if (getARMSubtarget().isThumb2())
+ addPass(createThumb2ITBlockPass());
}
-bool ARMBaseTargetMachine::addPreEmitPass(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel) {
- if (Subtarget.isThumb2() && !Subtarget.prefers32BitThumb())
- PM.add(createThumb2SizeReductionPass());
+void ARMPassConfig::addPreEmitPass() {
+ if (getARMSubtarget().isThumb2()) {
+ if (!getARMSubtarget().prefers32BitThumb())
+ addPass(createThumb2SizeReductionPass());
- PM.add(createARMConstantIslandPass());
- return true;
-}
+ // Constant island pass work on unbundled instructions.
+ addPass(&UnpackMachineBundlesID);
+ }
-bool ARMBaseTargetMachine::addCodeEmitter(PassManagerBase &PM,
- CodeGenOpt::Level OptLevel,
- JITCodeEmitter &JCE) {
- // Machine code emitter pass for ARM.
- PM.add(createARMJITCodeEmitterPass(*this, JCE));
- return false;
+ addPass(createARMOptimizeBarriersPass());
+ addPass(createARMConstantIslandPass());
}
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