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usr / src / contrib / llvm-project / llvm / lib / Target / SystemZ /

📁 ..
📁 AsmParser
📁 Disassembler
📁 MCTargetDesc
📄 README.txt(3.94 KB)
📄 SystemZ.h(8.19 KB)
📄 SystemZ.td(2.86 KB)
📄 SystemZAsmPrinter.cpp(23.49 KB)
📄 SystemZAsmPrinter.h(1.88 KB)
📄 SystemZCallingConv.cpp(710 B)
📄 SystemZCallingConv.h(4.89 KB)
📄 SystemZCallingConv.td(6.99 KB)
📄 SystemZConstantPoolValue.cpp(1.78 KB)
📄 SystemZConstantPoolValue.h(1.75 KB)
📄 SystemZCopyPhysRegs.cpp(3.82 KB)
📄 SystemZElimCompare.cpp(26.21 KB)
📄 SystemZFeatures.td(12.3 KB)
📄 SystemZFrameLowering.cpp(29.88 KB)
📄 SystemZFrameLowering.h(3.02 KB)
📄 SystemZHazardRecognizer.cpp(14.75 KB)
📄 SystemZHazardRecognizer.h(5.86 KB)
📄 SystemZISelDAGToDAG.cpp(68.74 KB)
📄 SystemZISelLowering.cpp(321.22 KB)
📄 SystemZISelLowering.h(28.44 KB)
📄 SystemZInstrBuilder.h(1.63 KB)
📄 SystemZInstrDFP.td(9.3 KB)
📄 SystemZInstrFP.td(26.21 KB)
📄 SystemZInstrFormats.td(182.82 KB)
📄 SystemZInstrHFP.td(9.46 KB)
📄 SystemZInstrInfo.cpp(69.75 KB)
📄 SystemZInstrInfo.h(14.6 KB)
📄 SystemZInstrInfo.td(103.17 KB)
📄 SystemZInstrSystem.td(17.18 KB)
📄 SystemZInstrVector.td(84.36 KB)
📄 SystemZLDCleanup.cpp(4.91 KB)
📄 SystemZLongBranch.cpp(16.04 KB)
📄 SystemZMCInstLower.cpp(3.16 KB)
📄 SystemZMCInstLower.h(1.28 KB)
📄 SystemZMachineFunctionInfo.cpp(508 B)
📄 SystemZMachineFunctionInfo.h(3.77 KB)
📄 SystemZMachineScheduler.cpp(8.76 KB)
📄 SystemZMachineScheduler.h(5.05 KB)
📄 SystemZOperands.td(24.89 KB)
📄 SystemZOperators.td(48.97 KB)
📄 SystemZPatterns.td(8.52 KB)
📄 SystemZPostRewrite.cpp(10.33 KB)
📄 SystemZProcessors.td(1.78 KB)
📄 SystemZRegisterInfo.cpp(16.27 KB)
📄 SystemZRegisterInfo.h(3.52 KB)
📄 SystemZRegisterInfo.td(12.04 KB)
📄 SystemZSchedule.td(2.1 KB)
📄 SystemZScheduleZ13.td(72.43 KB)
📄 SystemZScheduleZ14.td(78.06 KB)
📄 SystemZScheduleZ15.td(80.69 KB)
📄 SystemZScheduleZ196.td(55.68 KB)
📄 SystemZScheduleZEC12.td(57.44 KB)
📄 SystemZSelectionDAGInfo.cpp(12.92 KB)
📄 SystemZSelectionDAGInfo.h(3.15 KB)
📄 SystemZShortenInst.cpp(12 KB)
📄 SystemZSubtarget.cpp(3.67 KB)
📄 SystemZSubtarget.h(9.14 KB)
📄 SystemZTDC.cpp(13.52 KB)
📄 SystemZTargetMachine.cpp(11.58 KB)
📄 SystemZTargetMachine.h(2.09 KB)
📄 SystemZTargetTransformInfo.cpp(43.51 KB)
📄 SystemZTargetTransformInfo.h(4.88 KB)
📁 TargetInfo

Editing: SystemZLDCleanup.cpp

//===-- SystemZLDCleanup.cpp - Clean up local-dynamic TLS accesses --------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This pass combines multiple accesses to local-dynamic TLS variables so that
// the TLS base address for the module is only fetched once per execution path
// through the function.
//
//===----------------------------------------------------------------------===//

#include "SystemZMachineFunctionInfo.h"
#include "SystemZTargetMachine.h"
#include "llvm/CodeGen/MachineDominators.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetRegisterInfo.h"
#include "llvm/Target/TargetMachine.h"

using namespace llvm;

namespace {

class SystemZLDCleanup : public MachineFunctionPass {
public:
  static char ID;
  SystemZLDCleanup(const SystemZTargetMachine &tm)
    : MachineFunctionPass(ID), TII(nullptr), MF(nullptr) {}

StringRef getPassName() const override {
    return "SystemZ Local Dynamic TLS Access Clean-up";
  }

bool runOnMachineFunction(MachineFunction &MF) override;
  void getAnalysisUsage(AnalysisUsage &AU) const override;

private:
  bool VisitNode(MachineDomTreeNode *Node, unsigned TLSBaseAddrReg);
  MachineInstr *ReplaceTLSCall(MachineInstr *I, unsigned TLSBaseAddrReg);
  MachineInstr *SetRegister(MachineInstr *I, unsigned *TLSBaseAddrReg);

const SystemZInstrInfo *TII;
  MachineFunction *MF;
};

char SystemZLDCleanup::ID = 0;

} // end anonymous namespace

FunctionPass *llvm::createSystemZLDCleanupPass(SystemZTargetMachine &TM) {
  return new SystemZLDCleanup(TM);
}

void SystemZLDCleanup::getAnalysisUsage(AnalysisUsage &AU) const {
  AU.setPreservesCFG();
  AU.addRequired<MachineDominatorTree>();
  MachineFunctionPass::getAnalysisUsage(AU);
}

bool SystemZLDCleanup::runOnMachineFunction(MachineFunction &F) {
  if (skipFunction(F.getFunction()))
    return false;

TII = static_cast<const SystemZInstrInfo *>(F.getSubtarget().getInstrInfo());
  MF = &F;

SystemZMachineFunctionInfo* MFI = F.getInfo<SystemZMachineFunctionInfo>();
  if (MFI->getNumLocalDynamicTLSAccesses() < 2) {
    // No point folding accesses if there isn't at least two.
    return false;
  }

MachineDominatorTree *DT = &getAnalysis<MachineDominatorTree>();
  return VisitNode(DT->getRootNode(), 0);
}

// Visit the dominator subtree rooted at Node in pre-order.
// If TLSBaseAddrReg is non-null, then use that to replace any
// TLS_LDCALL instructions. Otherwise, create the register
// when the first such instruction is seen, and then use it
// as we encounter more instructions.
bool SystemZLDCleanup::VisitNode(MachineDomTreeNode *Node,
                                 unsigned TLSBaseAddrReg) {
  MachineBasicBlock *BB = Node->getBlock();
  bool Changed = false;

// Traverse the current block.
  for (auto I = BB->begin(), E = BB->end(); I != E; ++I) {
    switch (I->getOpcode()) {
      case SystemZ::TLS_LDCALL:
        if (TLSBaseAddrReg)
          I = ReplaceTLSCall(&*I, TLSBaseAddrReg);
        else
          I = SetRegister(&*I, &TLSBaseAddrReg);
        Changed = true;
        break;
      default:
        break;
    }
  }

// Visit the children of this block in the dominator tree.
  for (auto I = Node->begin(), E = Node->end(); I != E; ++I)
    Changed |= VisitNode(*I, TLSBaseAddrReg);

return Changed;
}

// Replace the TLS_LDCALL instruction I with a copy from TLSBaseAddrReg,
// returning the new instruction.
MachineInstr *SystemZLDCleanup::ReplaceTLSCall(MachineInstr *I,
                                               unsigned TLSBaseAddrReg) {
  // Insert a Copy from TLSBaseAddrReg to R2.
  MachineInstr *Copy = BuildMI(*I->getParent(), I, I->getDebugLoc(),
                               TII->get(TargetOpcode::COPY), SystemZ::R2D)
                               .addReg(TLSBaseAddrReg);

// Erase the TLS_LDCALL instruction.
  I->eraseFromParent();

return Copy;
}

// Create a virtual register in *TLSBaseAddrReg, and populate it by
// inserting a copy instruction after I. Returns the new instruction.
MachineInstr *SystemZLDCleanup::SetRegister(MachineInstr *I,
                                            unsigned *TLSBaseAddrReg) {
  // Create a virtual register for the TLS base address.
  MachineRegisterInfo &RegInfo = MF->getRegInfo();
  *TLSBaseAddrReg = RegInfo.createVirtualRegister(&SystemZ::GR64BitRegClass);

// Insert a copy from R2 to TLSBaseAddrReg.
  MachineInstr *Next = I->getNextNode();
  MachineInstr *Copy = BuildMI(*I->getParent(), Next, I->getDebugLoc(),
                               TII->get(TargetOpcode::COPY), *TLSBaseAddrReg)
                               .addReg(SystemZ::R2D);

return Copy;
}

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Editing: SystemZLDCleanup.cpp

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