llvm/lib/Target/X86/X86TargetMachine.cpp

//===-- X86TargetMachine.cpp - Define TargetMachine for the X86 -----------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the X86 specific subclass of TargetMachine.
//
//===----------------------------------------------------------------------===//

#include "X86TargetMachine.h"
#include "X86.h"
#include "X86TargetObjectFile.h"
#include "X86TargetTransformInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;

static cl::opt<bool> EnableMachineCombinerPass("x86-machine-combiner",
                               cl::desc("Enable the machine combiner pass"),
                               cl::init(true), cl::Hidden);

extern "C" void LLVMInitializeX86Target() {
  // Register the target.
  RegisterTargetMachine<X86TargetMachine> X(TheX86_32Target);
  RegisterTargetMachine<X86TargetMachine> Y(TheX86_64Target);
}

static std::unique_ptr<TargetLoweringObjectFile> createTLOF(const Triple &TT) {
  if (TT.isOSBinFormatMachO()) {
    if (TT.getArch() == Triple::x86_64)
      return make_unique<X86_64MachoTargetObjectFile>();
    return make_unique<TargetLoweringObjectFileMachO>();
  }

  if (TT.isOSLinux() || TT.isOSNaCl())
    return make_unique<X86LinuxNaClTargetObjectFile>();
  if (TT.isOSBinFormatELF())
    return make_unique<X86ELFTargetObjectFile>();
  if (TT.isKnownWindowsMSVCEnvironment())
    return make_unique<X86WindowsTargetObjectFile>();
  if (TT.isOSBinFormatCOFF())
    return make_unique<TargetLoweringObjectFileCOFF>();
  llvm_unreachable("unknown subtarget type");
}

static std::string computeDataLayout(const Triple &TT) {
  // X86 is little endian
  std::string Ret = "e";

  Ret += DataLayout::getManglingComponent(TT);
  // X86 and x32 have 32 bit pointers.
  if ((TT.isArch64Bit() &&
       (TT.getEnvironment() == Triple::GNUX32 || TT.isOSNaCl())) ||
      !TT.isArch64Bit())
    Ret += "-p:32:32";

  // Some ABIs align 64 bit integers and doubles to 64 bits, others to 32.
  if (TT.isArch64Bit() || TT.isOSWindows() || TT.isOSNaCl())
    Ret += "-i64:64";
  else
    Ret += "-f64:32:64";

  // Some ABIs align long double to 128 bits, others to 32.
  if (TT.isOSNaCl())
    ; // No f80
  else if (TT.isArch64Bit() || TT.isOSDarwin())
    Ret += "-f80:128";
  else
    Ret += "-f80:32";

  // The registers can hold 8, 16, 32 or, in x86-64, 64 bits.
  if (TT.isArch64Bit())
    Ret += "-n8:16:32:64";
  else
    Ret += "-n8:16:32";

  // The stack is aligned to 32 bits on some ABIs and 128 bits on others.
  if (!TT.isArch64Bit() && TT.isOSWindows())
    Ret += "-a:0:32-S32";
  else
    Ret += "-S128";

  return Ret;
}

/// X86TargetMachine ctor - Create an X86 target.
///
X86TargetMachine::X86TargetMachine(const Target &T, StringRef TT, StringRef CPU,
                                   StringRef FS, const TargetOptions &Options,
                                   Reloc::Model RM, CodeModel::Model CM,
                                   CodeGenOpt::Level OL)
    : LLVMTargetMachine(T, computeDataLayout(Triple(TT)), TT, CPU, FS, Options,
                        RM, CM, OL),
      TLOF(createTLOF(Triple(getTargetTriple()))),
      Subtarget(Triple(TT), CPU, FS, *this, Options.StackAlignmentOverride) {
  // Windows stack unwinder gets confused when execution flow "falls through"
  // after a call to 'noreturn' function.
  // To prevent that, we emit a trap for 'unreachable' IR instructions.
  // (which on X86, happens to be the 'ud2' instruction)
  if (Subtarget.isTargetWin64())
    this->Options.TrapUnreachable = true;

  // TODO: By default, all reciprocal estimate operations are off because
  // that matches the behavior before TargetRecip was added (except for btver2
  // which used subtarget features to enable this type of codegen).
  // We should change this to match GCC behavior where everything but
  // scalar division estimates are turned on by default with -ffast-math.
  this->Options.Reciprocals.setDefaults("all", false, 1);

  initAsmInfo();
}

X86TargetMachine::~X86TargetMachine() {}

const X86Subtarget *
X86TargetMachine::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;

  // 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.
  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
    // function that reside in TargetOptions.
    resetTargetOptions(F);
    I = llvm::make_unique<X86Subtarget>(Triple(TargetTriple), CPU, FS, *this,
                                        Options.StackAlignmentOverride);
  }
  return I.get();
}

//===----------------------------------------------------------------------===//
// Command line options for x86
//===----------------------------------------------------------------------===//
static cl::opt<bool>
UseVZeroUpper("x86-use-vzeroupper", cl::Hidden,
  cl::desc("Minimize AVX to SSE transition penalty"),
  cl::init(true));

//===----------------------------------------------------------------------===//
// X86 TTI query.
//===----------------------------------------------------------------------===//

TargetIRAnalysis X86TargetMachine::getTargetIRAnalysis() {
  return TargetIRAnalysis(
      [this](Function &F) { return TargetTransformInfo(X86TTIImpl(this, F)); });
}


//===----------------------------------------------------------------------===//
// Pass Pipeline Configuration
//===----------------------------------------------------------------------===//

namespace {
/// X86 Code Generator Pass Configuration Options.
class X86PassConfig : public TargetPassConfig {
public:
  X86PassConfig(X86TargetMachine *TM, PassManagerBase &PM)
    : TargetPassConfig(TM, PM) {}

  X86TargetMachine &getX86TargetMachine() const {
    return getTM<X86TargetMachine>();
  }

  void addIRPasses() override;
  bool addInstSelector() override;
  bool addILPOpts() override;
  bool addPreISel() override;
  void addPreRegAlloc() override;
  void addPostRegAlloc() override;
  void addPreEmitPass() override;
  void addPreSched2() override;
};
} // namespace

TargetPassConfig *X86TargetMachine::createPassConfig(PassManagerBase &PM) {
  return new X86PassConfig(this, PM);
}

void X86PassConfig::addIRPasses() {
  addPass(createAtomicExpandPass(&getX86TargetMachine()));

  TargetPassConfig::addIRPasses();
}

bool X86PassConfig::addInstSelector() {
  // Install an instruction selector.
  addPass(createX86ISelDag(getX86TargetMachine(), getOptLevel()));

  // For ELF, cleanup any local-dynamic TLS accesses.
  if (Triple(TM->getTargetTriple()).isOSBinFormatELF() &&
      getOptLevel() != CodeGenOpt::None)
    addPass(createCleanupLocalDynamicTLSPass());

  addPass(createX86GlobalBaseRegPass());

  return false;
}

bool X86PassConfig::addILPOpts() {
  addPass(&EarlyIfConverterID);
  if (EnableMachineCombinerPass)
    addPass(&MachineCombinerID);
  return true;
}

bool X86PassConfig::addPreISel() {
  // Only add this pass for 32-bit x86 Windows.
  Triple TT(TM->getTargetTriple());
  if (TT.isOSWindows() && TT.getArch() == Triple::x86)
    addPass(createX86WinEHStatePass());
  return true;
}

void X86PassConfig::addPreRegAlloc() {
  addPass(createX86CallFrameOptimization());
}

void X86PassConfig::addPostRegAlloc() {
  addPass(createX86FloatingPointStackifierPass());
}

void X86PassConfig::addPreSched2() { addPass(createX86ExpandPseudoPass()); }

void X86PassConfig::addPreEmitPass() {
  if (getOptLevel() != CodeGenOpt::None)
    addPass(createExecutionDependencyFixPass(&X86::VR128RegClass));

  if (UseVZeroUpper)
    addPass(createX86IssueVZeroUpperPass());

  if (getOptLevel() != CodeGenOpt::None) {
    addPass(createX86PadShortFunctions());
    addPass(createX86FixupLEAs());
  }
}