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llvm-6502/lib/Target/ARM/ARMTargetMachine.cpp
Eric Christopher c559ba7251 Add a new string member to the TargetOptions struct for the name 
of the abi we should be using. For targets that don't use the
option there's no change, otherwise this allows external users
to set the ABI via string and avoid some of the -backend-option
pain in clang.

Use this option to move the ABI for the ARM port from the
Subtarget to the TargetMachine and update the testcases
accordingly since it's no longer valid to set via -mattr.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224492 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-18 02:20:58 +00:00

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//===-- ARMTargetMachine.cpp - Define TargetMachine for ARM ---------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
//
//===----------------------------------------------------------------------===//
#include "ARM.h"
#include "ARMTargetMachine.h"
#include "ARMFrameLowering.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>
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<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.getABIName().startswith("aapcs"))
return ARMBaseTargetMachine::ARM_ABI_AAPCS;
else if (Options.getABIName().startswith("apcs"))
return ARMBaseTargetMachine::ARM_ABI_APCS;
assert(Options.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,
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;
}
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,
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 ARMPassConfig::addPreISel() {
if (TM->getOptLevel() != CodeGenOpt::None)
addPass(createGlobalMergePass(TM));
return false;
}
bool ARMPassConfig::addInstSelector() {
addPass(createARMISelDag(getARMTargetMachine(), getOptLevel()));
const ARMSubtarget *Subtarget = &getARMSubtarget();
if (Subtarget->isTargetELF() && !Subtarget->isThumb1Only() &&
TM->Options.EnableFastISel)
addPass(createARMGlobalBaseRegPass());
return false;
}
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());
}
}
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.
addPass(createARMExpandPseudoPass());
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 (getARMSubtarget().isThumb2())
addPass(createThumb2ITBlockPass());
}
void ARMPassConfig::addPreEmitPass() {
if (getARMSubtarget().isThumb2()) {
if (!getARMSubtarget().prefers32BitThumb())
addPass(createThumb2SizeReductionPass());
// Constant island pass work on unbundled instructions.
addPass(&UnpackMachineBundlesID);
}
addPass(createARMOptimizeBarriersPass());
addPass(createARMConstantIslandPass());
}
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