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https://github.com/c64scene-ar/llvm-6502.git
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This is a preliminary step towards ELF support; currently ARMFastISel hasn't been used for ELF object files yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164759 91177308-0d34-0410-b5e6-96231b3b80d8
149 lines
4.8 KiB
C++
149 lines
4.8 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/Function.h"
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#include "llvm/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(*this, STI) {
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}
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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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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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virtual bool runOnMachineFunction(MachineFunction &MF) {
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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 ARMTargetMachine *TM =
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static_cast<const ARMTargetMachine *>(&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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GlobalValue *GV = new GlobalVariable(Type::getInt32Ty(*Context), false,
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GlobalValue::ExternalLinkage, 0,
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"_GLOBAL_OFFSET_TABLE_");
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unsigned Id = AFI->createPICLabelUId();
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ARMConstantPoolValue *CPV = ARMConstantPoolConstant::Create(GV, Id);
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unsigned Align = TM->getTargetData()->getPrefTypeAlignment(GV->getType());
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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 GlobalBaseReg = AFI->getGlobalBaseReg();
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unsigned Opc = TM->getSubtarget<ARMSubtarget>().isThumb2() ?
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ARM::t2LDRpci : ARM::LDRcp;
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const TargetInstrInfo &TII = *TM->getInstrInfo();
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MachineInstrBuilder MIB = BuildMI(FirstMBB, MBBI, DL,
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TII.get(Opc), GlobalBaseReg)
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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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return true;
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}
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virtual const char *getPassName() const {
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return "ARM PIC Global Base Reg Initialization";
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}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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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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