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https://github.com/c64scene-ar/llvm-6502.git
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cd52a7a381
Apparently, the style needs to be agreed upon first. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240390 91177308-0d34-0410-b5e6-96231b3b80d8
206 lines
6.7 KiB
C++
206 lines
6.7 KiB
C++
//===-- ARMInstrInfo.cpp - ARM Instruction Information --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the ARM implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMInstrInfo.h"
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#include "ARM.h"
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#include "ARMConstantPoolValue.h"
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#include "ARMMachineFunctionInfo.h"
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#include "ARMTargetMachine.h"
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#include "MCTargetDesc/ARMAddressingModes.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/CodeGen/LiveVariables.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInst.h"
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using namespace llvm;
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ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
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: ARMBaseInstrInfo(STI), RI() {}
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/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
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void ARMInstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
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if (hasNOP()) {
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NopInst.setOpcode(ARM::HINT);
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NopInst.addOperand(MCOperand::createImm(0));
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NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
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NopInst.addOperand(MCOperand::createReg(0));
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} else {
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NopInst.setOpcode(ARM::MOVr);
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NopInst.addOperand(MCOperand::createReg(ARM::R0));
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NopInst.addOperand(MCOperand::createReg(ARM::R0));
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NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
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NopInst.addOperand(MCOperand::createReg(0));
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NopInst.addOperand(MCOperand::createReg(0));
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}
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}
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unsigned ARMInstrInfo::getUnindexedOpcode(unsigned Opc) const {
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switch (Opc) {
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default: break;
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case ARM::LDR_PRE_IMM:
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case ARM::LDR_PRE_REG:
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case ARM::LDR_POST_IMM:
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case ARM::LDR_POST_REG:
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return ARM::LDRi12;
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case ARM::LDRH_PRE:
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case ARM::LDRH_POST:
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return ARM::LDRH;
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case ARM::LDRB_PRE_IMM:
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case ARM::LDRB_PRE_REG:
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case ARM::LDRB_POST_IMM:
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case ARM::LDRB_POST_REG:
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return ARM::LDRBi12;
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case ARM::LDRSH_PRE:
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case ARM::LDRSH_POST:
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return ARM::LDRSH;
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case ARM::LDRSB_PRE:
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case ARM::LDRSB_POST:
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return ARM::LDRSB;
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case ARM::STR_PRE_IMM:
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case ARM::STR_PRE_REG:
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case ARM::STR_POST_IMM:
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case ARM::STR_POST_REG:
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return ARM::STRi12;
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case ARM::STRH_PRE:
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case ARM::STRH_POST:
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return ARM::STRH;
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case ARM::STRB_PRE_IMM:
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case ARM::STRB_PRE_REG:
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case ARM::STRB_POST_IMM:
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case ARM::STRB_POST_REG:
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return ARM::STRBi12;
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}
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return 0;
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}
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void ARMInstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI,
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Reloc::Model RM) const {
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MachineFunction &MF = *MI->getParent()->getParent();
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const ARMSubtarget &Subtarget = MF.getSubtarget<ARMSubtarget>();
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if (!Subtarget.useMovt(MF)) {
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if (RM == Reloc::PIC_)
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expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_pcrel, ARM::LDRi12, RM);
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else
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expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_abs, ARM::LDRi12, RM);
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return;
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}
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if (RM != Reloc::PIC_) {
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expandLoadStackGuardBase(MI, ARM::MOVi32imm, ARM::LDRi12, RM);
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return;
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}
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const GlobalValue *GV =
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cast<GlobalValue>((*MI->memoperands_begin())->getValue());
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if (!Subtarget.GVIsIndirectSymbol(GV, RM)) {
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expandLoadStackGuardBase(MI, ARM::MOV_ga_pcrel, ARM::LDRi12, RM);
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return;
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}
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MachineBasicBlock &MBB = *MI->getParent();
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DebugLoc DL = MI->getDebugLoc();
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unsigned Reg = MI->getOperand(0).getReg();
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MachineInstrBuilder MIB;
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MIB = BuildMI(MBB, MI, DL, get(ARM::MOV_ga_pcrel_ldr), Reg)
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.addGlobalAddress(GV, 0, ARMII::MO_NONLAZY);
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unsigned Flag = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant;
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MachineMemOperand *MMO = MBB.getParent()->getMachineMemOperand(
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MachinePointerInfo::getGOT(), Flag, 4, 4);
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MIB.addMemOperand(MMO);
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MIB = BuildMI(MBB, MI, DL, get(ARM::LDRi12), Reg);
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MIB.addReg(Reg, RegState::Kill).addImm(0);
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MIB.setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
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AddDefaultPred(MIB);
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}
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namespace {
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/// ARMCGBR - Create Global Base Reg pass. This initializes the PIC
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/// global base register for ARM ELF.
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struct ARMCGBR : public MachineFunctionPass {
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static char ID;
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ARMCGBR() : MachineFunctionPass(ID) {}
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bool runOnMachineFunction(MachineFunction &MF) override {
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ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
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if (AFI->getGlobalBaseReg() == 0)
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return false;
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const ARMSubtarget &STI =
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static_cast<const ARMSubtarget &>(MF.getSubtarget());
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// Don't do this for Thumb1.
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if (STI.isThumb1Only())
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return false;
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const TargetMachine &TM = MF.getTarget();
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if (TM.getRelocationModel() != Reloc::PIC_)
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return false;
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LLVMContext *Context = &MF.getFunction()->getContext();
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unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
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unsigned PCAdj = STI.isThumb() ? 4 : 8;
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ARMConstantPoolValue *CPV = ARMConstantPoolSymbol::Create(
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*Context, "_GLOBAL_OFFSET_TABLE_", ARMPCLabelIndex, PCAdj);
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unsigned Align = TM.getDataLayout()->getPrefTypeAlignment(
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Type::getInt32PtrTy(*Context));
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unsigned Idx = MF.getConstantPool()->getConstantPoolIndex(CPV, Align);
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MachineBasicBlock &FirstMBB = MF.front();
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MachineBasicBlock::iterator MBBI = FirstMBB.begin();
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DebugLoc DL = FirstMBB.findDebugLoc(MBBI);
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unsigned TempReg =
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MF.getRegInfo().createVirtualRegister(&ARM::rGPRRegClass);
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unsigned Opc = STI.isThumb2() ? ARM::t2LDRpci : ARM::LDRcp;
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const TargetInstrInfo &TII = *STI.getInstrInfo();
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MachineInstrBuilder MIB = BuildMI(FirstMBB, MBBI, DL,
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TII.get(Opc), TempReg)
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.addConstantPoolIndex(Idx);
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if (Opc == ARM::LDRcp)
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MIB.addImm(0);
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AddDefaultPred(MIB);
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// Fix the GOT address by adding pc.
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unsigned GlobalBaseReg = AFI->getGlobalBaseReg();
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Opc = STI.isThumb2() ? ARM::tPICADD : ARM::PICADD;
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MIB = BuildMI(FirstMBB, MBBI, DL, TII.get(Opc), GlobalBaseReg)
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.addReg(TempReg)
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.addImm(ARMPCLabelIndex);
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if (Opc == ARM::PICADD)
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AddDefaultPred(MIB);
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return true;
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}
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const char *getPassName() const override {
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return "ARM PIC Global Base Reg Initialization";
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}
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.setPreservesCFG();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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};
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}
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char ARMCGBR::ID = 0;
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FunctionPass*
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llvm::createARMGlobalBaseRegPass() { return new ARMCGBR(); }
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