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📁 ..
📁 AsmParser
📁 Disassembler
📁 MCTargetDesc
📄 P9InstrResources.td(37.36 KB)
📄 PPC.h(4.69 KB)
📄 PPC.td(32.37 KB)
📄 PPCAsmPrinter.cpp(70.77 KB)
📄 PPCBoolRetToInt.cpp(9.97 KB)
📄 PPCBranchCoalescing.cpp(30.16 KB)
📄 PPCBranchSelector.cpp(15.97 KB)
📄 PPCCCState.cpp(1.08 KB)
📄 PPCCCState.h(1.19 KB)
📄 PPCCTRLoops.cpp(6.68 KB)
📄 PPCCallingConv.cpp(6.19 KB)
📄 PPCCallingConv.h(1.97 KB)
📄 PPCCallingConv.td(16.32 KB)
📄 PPCEarlyReturn.cpp(7.14 KB)
📄 PPCExpandISEL.cpp(17.93 KB)
📄 PPCFastISel.cpp(85.51 KB)
📄 PPCFrameLowering.cpp(98.6 KB)
📄 PPCFrameLowering.h(7.46 KB)
📄 PPCHazardRecognizers.cpp(14.02 KB)
📄 PPCHazardRecognizers.h(3.83 KB)
📄 PPCISelDAGToDAG.cpp(256.88 KB)
📄 PPCISelLowering.cpp(669.73 KB)
📄 PPCISelLowering.h(55.9 KB)
📄 PPCInstr64Bit.td(75.68 KB)
📄 PPCInstrAltivec.td(77.68 KB)
📄 PPCInstrBuilder.h(1.5 KB)
📄 PPCInstrFormats.td(57.38 KB)
📄 PPCInstrHTM.td(5.48 KB)
📄 PPCInstrInfo.cpp(171.06 KB)
📄 PPCInstrInfo.h(29.06 KB)
📄 PPCInstrInfo.td(233.39 KB)
📄 PPCInstrPrefix.td(41.72 KB)
📄 PPCInstrQPX.td(57.56 KB)
📄 PPCInstrSPE.td(49.71 KB)
📄 PPCInstrVSX.td(223.48 KB)
📄 PPCLoopInstrFormPrep.cpp(33.45 KB)
📄 PPCLowerMASSVEntries.cpp(6.42 KB)
📄 PPCMCInstLower.cpp(6.62 KB)
📄 PPCMIPeephole.cpp(63.48 KB)
📄 PPCMachineFunctionInfo.cpp(2.59 KB)
📄 PPCMachineFunctionInfo.h(9.15 KB)
📄 PPCMachineScheduler.cpp(4.03 KB)
📄 PPCMachineScheduler.h(1.81 KB)
📄 PPCMacroFusion.cpp(6.68 KB)
📄 PPCMacroFusion.def(1.8 KB)
📄 PPCMacroFusion.h(886 B)
📄 PPCPerfectShuffle.h(397.57 KB)
📄 PPCPfmCounters.td(705 B)
📄 PPCPreEmitPeephole.cpp(13.36 KB)
📄 PPCQPXLoadSplat.cpp(5.31 KB)
📄 PPCReduceCRLogicals.cpp(28.66 KB)
📄 PPCRegisterInfo.cpp(51.93 KB)
📄 PPCRegisterInfo.h(6.61 KB)
📄 PPCRegisterInfo.td(14.24 KB)
📄 PPCSchedule.td(5.21 KB)
📄 PPCSchedule440.td(34.57 KB)
📄 PPCScheduleA2.td(7.85 KB)
📄 PPCScheduleE500.td(16.59 KB)
📄 PPCScheduleE500mc.td(20.89 KB)
📄 PPCScheduleE5500.td(23.62 KB)
📄 PPCScheduleG3.td(4.49 KB)
📄 PPCScheduleG4.td(5.42 KB)
📄 PPCScheduleG4Plus.td(6.45 KB)
📄 PPCScheduleG5.td(7.1 KB)
📄 PPCScheduleP7.td(22.26 KB)
📄 PPCScheduleP8.td(23.96 KB)
📄 PPCScheduleP9.td(12.27 KB)
📄 PPCSubtarget.cpp(7.58 KB)
📄 PPCSubtarget.h(13.21 KB)
📄 PPCTLSDynamicCall.cpp(6.53 KB)
📄 PPCTOCRegDeps.cpp(5.3 KB)
📄 PPCTargetMachine.cpp(18.94 KB)
📄 PPCTargetMachine.h(2.2 KB)
📄 PPCTargetObjectFile.cpp(2.45 KB)
📄 PPCTargetObjectFile.h(1.19 KB)
📄 PPCTargetStreamer.h(1.02 KB)
📄 PPCTargetTransformInfo.cpp(38.72 KB)
📄 PPCTargetTransformInfo.h(5.6 KB)
📄 PPCVSXCopy.cpp(5.68 KB)
📄 PPCVSXFMAMutate.cpp(15.12 KB)
📄 PPCVSXSwapRemoval.cpp(36.78 KB)
📄 README_P9.txt(22.25 KB)
📁 TargetInfo

Editing: PPCTOCRegDeps.cpp

//===-- PPCTOCRegDeps.cpp - Add Extra TOC Register Dependencies -----------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// When resolving an address using the ELF ABI TOC pointer, two relocations are
// generally required: one for the high part and one for the low part. Only
// the high part generally explicitly depends on r2 (the TOC pointer). And, so,
// we might produce code like this:
//
// .Ltmp526:
//         addis 3, 2, .LC12@toc@ha
// .Ltmp1628:
//         std 2, 40(1)
//         ld 5, 0(27)
//         ld 2, 8(27)
//         ld 11, 16(27)
//         ld 3, .LC12@toc@l(3)
//         rldicl 4, 4, 0, 32
//         mtctr 5
//         bctrl
//         ld 2, 40(1)
//
// And there is nothing wrong with this code, as such, but there is a linker bug
// in binutils (https://sourceware.org/bugzilla/show_bug.cgi?id=18414) that will
// misoptimize this code sequence to this:
//         nop
//         std     r2,40(r1)
//         ld      r5,0(r27)
//         ld      r2,8(r27)
//         ld      r11,16(r27)
//         ld      r3,-32472(r2)
//         clrldi  r4,r4,32
//         mtctr   r5
//         bctrl
//         ld      r2,40(r1)
// because the linker does not know (and does not check) that the value in r2
// changed in between the instruction using the .LC12@toc@ha (TOC-relative)
// relocation and the instruction using the .LC12@toc@l(3) relocation.
// Because it finds these instructions using the relocations (and not by
// scanning the instructions), it has been asserted that there is no good way
// to detect the change of r2 in between. As a result, this bug may never be
// fixed (i.e. it may become part of the definition of the ABI). GCC was
// updated to add extra dependencies on r2 to instructions using the @toc@l
// relocations to avoid this problem, and we'll do the same here.
//
// This is done as a separate pass because:
//  1. These extra r2 dependencies are not really properties of the
//     instructions, but rather due to a linker bug, and maybe one day we'll be
//     able to get rid of them when targeting linkers without this bug (and,
//     thus, keeping the logic centralized here will make that
//     straightforward).
//  2. There are ISel-level peephole optimizations that propagate the @toc@l
//     relocations to some user instructions, and so the exta dependencies do
//     not apply only to a fixed set of instructions (without undesirable
//     definition replication).
//
//===----------------------------------------------------------------------===//

#include "MCTargetDesc/PPCPredicates.h"
#include "PPC.h"
#include "PPCInstrBuilder.h"
#include "PPCInstrInfo.h"
#include "PPCMachineFunctionInfo.h"
#include "PPCTargetMachine.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/raw_ostream.h"

using namespace llvm;

#define DEBUG_TYPE "ppc-toc-reg-deps"

namespace {
  // PPCTOCRegDeps pass - For simple functions without epilogue code, move
  // returns up, and create conditional returns, to avoid unnecessary
  // branch-to-blr sequences.
  struct PPCTOCRegDeps : public MachineFunctionPass {
    static char ID;
    PPCTOCRegDeps() : MachineFunctionPass(ID) {
      initializePPCTOCRegDepsPass(*PassRegistry::getPassRegistry());
    }

protected:
    bool hasTOCLoReloc(const MachineInstr &MI) {
      if (MI.getOpcode() == PPC::LDtocL ||
          MI.getOpcode() == PPC::ADDItocL ||
          MI.getOpcode() == PPC::LWZtocL)
        return true;

for (const MachineOperand &MO : MI.operands()) {
        if ((MO.getTargetFlags() & PPCII::MO_ACCESS_MASK) == PPCII::MO_TOC_LO)
          return true;
      }

return false;
    }

bool processBlock(MachineBasicBlock &MBB) {
      bool Changed = false;

const bool isPPC64 =
          MBB.getParent()->getSubtarget<PPCSubtarget>().isPPC64();
      const unsigned TOCReg = isPPC64 ? PPC::X2 : PPC::R2;

for (auto &MI : MBB) {
        if (!hasTOCLoReloc(MI))
          continue;

MI.addOperand(MachineOperand::CreateReg(TOCReg,
                                                false  /*IsDef*/,
                                                true  /*IsImp*/));
        Changed = true;
      }

return Changed;
    }

public:
    bool runOnMachineFunction(MachineFunction &MF) override {
      bool Changed = false;

for (MachineFunction::iterator I = MF.begin(); I != MF.end();) {
        MachineBasicBlock &B = *I++;
        if (processBlock(B))
          Changed = true;
      }

return Changed;
    }

void getAnalysisUsage(AnalysisUsage &AU) const override {
      MachineFunctionPass::getAnalysisUsage(AU);
    }
  };
}

INITIALIZE_PASS(PPCTOCRegDeps, DEBUG_TYPE,
                "PowerPC TOC Register Dependencies", false, false)

char PPCTOCRegDeps::ID = 0;
FunctionPass*
llvm::createPPCTOCRegDepsPass() { return new PPCTOCRegDeps(); }

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Editing: PPCTOCRegDeps.cpp

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