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//===-- ARM/ARMCodeEmitter.cpp - Convert ARM code to machine code ---------===//
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// The LLVM Compiler Infrastructure
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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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// This file contains the pass that transforms the ARM machine instructions into
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// relocatable machine code.
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "ARMAddressingModes.h"
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#include "ARMConstantPoolValue.h"
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#include "ARMInstrInfo.h"
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#include "ARMRelocations.h"
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#include "ARMSubtarget.h"
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#include "ARMTargetMachine.h"
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#include "llvm/Constants.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Function.h"
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#include "llvm/PassManager.h"
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#include "llvm/CodeGen/JITCodeEmitter.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineModuleInfo.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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STATISTIC(NumEmitted, "Number of machine instructions emitted");
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class ARMCodeEmitter : public MachineFunctionPass {
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const ARMInstrInfo *II;
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const ARMSubtarget *Subtarget;
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const std::vector<MachineConstantPoolEntry> *MCPEs;
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const std::vector<MachineJumpTableEntry> *MJTEs;
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void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<MachineModuleInfo>();
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MachineFunctionPass::getAnalysisUsage(AU);
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ARMCodeEmitter(TargetMachine &tm, JITCodeEmitter &mce)
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: MachineFunctionPass(&ID), JTI(0), II((ARMInstrInfo*)tm.getInstrInfo()),
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TD(tm.getTargetData()), TM(tm),
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MCE(mce), MCPEs(0), MJTEs(0),
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IsPIC(TM.getRelocationModel() == Reloc::PIC_) {}
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/// getBinaryCodeForInstr - This function, generated by the
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/// CodeEmitterGenerator using TableGen, produces the binary encoding for
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/// machine instructions.
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unsigned getBinaryCodeForInstr(const MachineInstr &MI);
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bool runOnMachineFunction(MachineFunction &MF);
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virtual const char *getPassName() const {
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return "ARM Machine Code Emitter";
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void emitInstruction(const MachineInstr &MI);
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void emitWordLE(unsigned Binary);
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void emitDWordLE(uint64_t Binary);
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void emitConstPoolInstruction(const MachineInstr &MI);
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void emitMOVi2piecesInstruction(const MachineInstr &MI);
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void emitLEApcrelJTInstruction(const MachineInstr &MI);
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void emitPseudoMoveInstruction(const MachineInstr &MI);
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void addPCLabel(unsigned LabelID);
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void emitPseudoInstruction(const MachineInstr &MI);
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unsigned getMachineSoRegOpValue(const MachineInstr &MI,
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const TargetInstrDesc &TID,
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const MachineOperand &MO,
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unsigned getMachineSoImmOpValue(unsigned SoImm);
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unsigned getAddrModeSBit(const MachineInstr &MI,
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const TargetInstrDesc &TID) const;
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void emitDataProcessingInstruction(const MachineInstr &MI,
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unsigned ImplicitRd = 0,
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unsigned ImplicitRn = 0);
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void emitLoadStoreInstruction(const MachineInstr &MI,
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unsigned ImplicitRd = 0,
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unsigned ImplicitRn = 0);
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void emitMiscLoadStoreInstruction(const MachineInstr &MI,
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unsigned ImplicitRn = 0);
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void emitLoadStoreMultipleInstruction(const MachineInstr &MI);
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void emitMulFrmInstruction(const MachineInstr &MI);
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void emitExtendInstruction(const MachineInstr &MI);
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void emitMiscArithInstruction(const MachineInstr &MI);
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void emitBranchInstruction(const MachineInstr &MI);
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void emitInlineJumpTable(unsigned JTIndex);
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void emitMiscBranchInstruction(const MachineInstr &MI);
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void emitVFPArithInstruction(const MachineInstr &MI);
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void emitVFPConversionInstruction(const MachineInstr &MI);
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void emitVFPLoadStoreInstruction(const MachineInstr &MI);
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void emitVFPLoadStoreMultipleInstruction(const MachineInstr &MI);
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void emitMiscInstruction(const MachineInstr &MI);
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/// getMachineOpValue - Return binary encoding of operand. If the machine
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/// operand requires relocation, record the relocation and return zero.
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unsigned getMachineOpValue(const MachineInstr &MI,const MachineOperand &MO);
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unsigned getMachineOpValue(const MachineInstr &MI, unsigned OpIdx) {
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return getMachineOpValue(MI, MI.getOperand(OpIdx));
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/// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
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unsigned getShiftOp(unsigned Imm) const ;
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/// Routines that handle operands which add machine relocations which are
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/// fixed up by the relocation stage.
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void emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
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bool MayNeedFarStub, bool Indirect,
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void emitExternalSymbolAddress(const char *ES, unsigned Reloc);
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void emitConstPoolAddress(unsigned CPI, unsigned Reloc);
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void emitJumpTableAddress(unsigned JTIndex, unsigned Reloc);
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void emitMachineBasicBlock(MachineBasicBlock *BB, unsigned Reloc,
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intptr_t JTBase = 0);
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char ARMCodeEmitter::ID = 0;
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/// createARMJITCodeEmitterPass - Return a pass that emits the collected ARM
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/// code to the specified MCE object.
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FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
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JITCodeEmitter &JCE) {
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return new ARMCodeEmitter(TM, JCE);
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bool ARMCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
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assert((MF.getTarget().getRelocationModel() != Reloc::Default ||
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MF.getTarget().getRelocationModel() != Reloc::Static) &&
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"JIT relocation model must be set to static or default!");
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JTI = ((ARMTargetMachine&)MF.getTarget()).getJITInfo();
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II = ((ARMTargetMachine&)MF.getTarget()).getInstrInfo();
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TD = ((ARMTargetMachine&)MF.getTarget()).getTargetData();
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Subtarget = &TM.getSubtarget<ARMSubtarget>();
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MCPEs = &MF.getConstantPool()->getConstants();
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if (MF.getJumpTableInfo()) MJTEs = &MF.getJumpTableInfo()->getJumpTables();
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IsPIC = TM.getRelocationModel() == Reloc::PIC_;
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JTI->Initialize(MF, IsPIC);
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MCE.setModuleInfo(&getAnalysis<MachineModuleInfo>());
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DEBUG(errs() << "JITTing function '"
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<< MF.getFunction()->getName() << "'\n");
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MCE.startFunction(MF);
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for (MachineFunction::iterator MBB = MF.begin(), E = MF.end();
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MCE.StartMachineBasicBlock(MBB);
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for (MachineBasicBlock::const_iterator I = MBB->begin(), E = MBB->end();
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} while (MCE.finishFunction(MF));
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/// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
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unsigned ARMCodeEmitter::getShiftOp(unsigned Imm) const {
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switch (ARM_AM::getAM2ShiftOpc(Imm)) {
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default: llvm_unreachable("Unknown shift opc!");
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case ARM_AM::asr: return 2;
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case ARM_AM::lsl: return 0;
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case ARM_AM::lsr: return 1;
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case ARM_AM::rrx: return 3;
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/// getMachineOpValue - Return binary encoding of operand. If the machine
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/// operand requires relocation, record the relocation and return zero.
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unsigned ARMCodeEmitter::getMachineOpValue(const MachineInstr &MI,
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const MachineOperand &MO) {
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return ARMRegisterInfo::getRegisterNumbering(MO.getReg());
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return static_cast<unsigned>(MO.getImm());
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else if (MO.isGlobal())
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emitGlobalAddress(MO.getGlobal(), ARM::reloc_arm_branch, true, false);
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else if (MO.isSymbol())
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emitExternalSymbolAddress(MO.getSymbolName(), ARM::reloc_arm_branch);
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else if (MO.isCPI()) {
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const TargetInstrDesc &TID = MI.getDesc();
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// For VFP load, the immediate offset is multiplied by 4.
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unsigned Reloc = ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPLdStFrm)
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? ARM::reloc_arm_vfp_cp_entry : ARM::reloc_arm_cp_entry;
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emitConstPoolAddress(MO.getIndex(), Reloc);
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} else if (MO.isJTI())
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emitJumpTableAddress(MO.getIndex(), ARM::reloc_arm_relative);
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emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
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/// emitGlobalAddress - Emit the specified address to the code stream.
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void ARMCodeEmitter::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
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bool MayNeedFarStub, bool Indirect,
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MachineRelocation MR = Indirect
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? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
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GV, ACPV, MayNeedFarStub)
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: MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
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GV, ACPV, MayNeedFarStub);
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MCE.addRelocation(MR);
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/// emitExternalSymbolAddress - Arrange for the address of an external symbol to
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/// be emitted to the current location in the function, and allow it to be PC
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void ARMCodeEmitter::emitExternalSymbolAddress(const char *ES, unsigned Reloc) {
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MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
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/// emitConstPoolAddress - Arrange for the address of an constant pool
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/// to be emitted to the current location in the function, and allow it to be PC
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void ARMCodeEmitter::emitConstPoolAddress(unsigned CPI, unsigned Reloc) {
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// Tell JIT emitter we'll resolve the address.
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MCE.addRelocation(MachineRelocation::getConstPool(MCE.getCurrentPCOffset(),
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Reloc, CPI, 0, true));
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/// emitJumpTableAddress - Arrange for the address of a jump table to
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/// be emitted to the current location in the function, and allow it to be PC
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void ARMCodeEmitter::emitJumpTableAddress(unsigned JTIndex, unsigned Reloc) {
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MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
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Reloc, JTIndex, 0, true));
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/// emitMachineBasicBlock - Emit the specified address basic block.
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void ARMCodeEmitter::emitMachineBasicBlock(MachineBasicBlock *BB,
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unsigned Reloc, intptr_t JTBase) {
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MCE.addRelocation(MachineRelocation::getBB(MCE.getCurrentPCOffset(),
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void ARMCodeEmitter::emitWordLE(unsigned Binary) {
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DEBUG(errs() << " 0x";
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errs().write_hex(Binary) << "\n");
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MCE.emitWordLE(Binary);
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void ARMCodeEmitter::emitDWordLE(uint64_t Binary) {
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DEBUG(errs() << " 0x";
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errs().write_hex(Binary) << "\n");
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MCE.emitDWordLE(Binary);
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void ARMCodeEmitter::emitInstruction(const MachineInstr &MI) {
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DEBUG(errs() << "JIT: " << (void*)MCE.getCurrentPCValue() << ":\t" << MI);
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MCE.processDebugLoc(MI.getDebugLoc(), true);
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NumEmitted++; // Keep track of the # of mi's emitted
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switch (MI.getDesc().TSFlags & ARMII::FormMask) {
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llvm_unreachable("Unhandled instruction encoding format!");
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emitPseudoInstruction(MI);
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case ARMII::DPSoRegFrm:
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emitDataProcessingInstruction(MI);
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emitLoadStoreInstruction(MI);
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case ARMII::LdMiscFrm:
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case ARMII::StMiscFrm:
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emitMiscLoadStoreInstruction(MI);
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case ARMII::LdStMulFrm:
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emitLoadStoreMultipleInstruction(MI);
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emitMulFrmInstruction(MI);
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emitExtendInstruction(MI);
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case ARMII::ArithMiscFrm:
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emitMiscArithInstruction(MI);
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emitBranchInstruction(MI);
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case ARMII::BrMiscFrm:
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emitMiscBranchInstruction(MI);
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case ARMII::VFPUnaryFrm:
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case ARMII::VFPBinaryFrm:
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emitVFPArithInstruction(MI);
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case ARMII::VFPConv1Frm:
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case ARMII::VFPConv2Frm:
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case ARMII::VFPConv3Frm:
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case ARMII::VFPConv4Frm:
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case ARMII::VFPConv5Frm:
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emitVFPConversionInstruction(MI);
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case ARMII::VFPLdStFrm:
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emitVFPLoadStoreInstruction(MI);
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case ARMII::VFPLdStMulFrm:
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emitVFPLoadStoreMultipleInstruction(MI);
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case ARMII::VFPMiscFrm:
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emitMiscInstruction(MI);
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MCE.processDebugLoc(MI.getDebugLoc(), false);
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void ARMCodeEmitter::emitConstPoolInstruction(const MachineInstr &MI) {
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unsigned CPI = MI.getOperand(0).getImm(); // CP instruction index.
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unsigned CPIndex = MI.getOperand(1).getIndex(); // Actual cp entry index.
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const MachineConstantPoolEntry &MCPE = (*MCPEs)[CPIndex];
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// Remember the CONSTPOOL_ENTRY address for later relocation.
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JTI->addConstantPoolEntryAddr(CPI, MCE.getCurrentPCValue());
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// Emit constpool island entry. In most cases, the actual values will be
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// resolved and relocated after code emission.
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if (MCPE.isMachineConstantPoolEntry()) {
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ARMConstantPoolValue *ACPV =
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static_cast<ARMConstantPoolValue*>(MCPE.Val.MachineCPVal);
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DEBUG(errs() << " ** ARM constant pool #" << CPI << " @ "
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<< (void*)MCE.getCurrentPCValue() << " " << *ACPV << '\n');
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assert(ACPV->isGlobalValue() && "unsupported constant pool value");
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GlobalValue *GV = ACPV->getGV();
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Reloc::Model RelocM = TM.getRelocationModel();
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emitGlobalAddress(GV, ARM::reloc_arm_machine_cp_entry,
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Subtarget->GVIsIndirectSymbol(GV, RelocM),
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emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
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Constant *CV = MCPE.Val.ConstVal;
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errs() << " ** Constant pool #" << CPI << " @ "
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<< (void*)MCE.getCurrentPCValue() << " ";
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if (const Function *F = dyn_cast<Function>(CV))
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errs() << F->getName();
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if (GlobalValue *GV = dyn_cast<GlobalValue>(CV)) {
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emitGlobalAddress(GV, ARM::reloc_arm_absolute, isa<Function>(GV), false);
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} else if (const ConstantInt *CI = dyn_cast<ConstantInt>(CV)) {
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uint32_t Val = *(uint32_t*)CI->getValue().getRawData();
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} else if (const ConstantFP *CFP = dyn_cast<ConstantFP>(CV)) {
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if (CFP->getType()->isFloatTy())
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emitWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
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else if (CFP->getType()->isDoubleTy())
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emitDWordLE(CFP->getValueAPF().bitcastToAPInt().getZExtValue());
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llvm_unreachable("Unable to handle this constantpool entry!");
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llvm_unreachable("Unable to handle this constantpool entry!");
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void ARMCodeEmitter::emitMOVi2piecesInstruction(const MachineInstr &MI) {
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const MachineOperand &MO0 = MI.getOperand(0);
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const MachineOperand &MO1 = MI.getOperand(1);
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assert(MO1.isImm() && ARM_AM::getSOImmVal(MO1.isImm()) != -1 &&
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"Not a valid so_imm value!");
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unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
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unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
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// Emit the 'mov' instruction.
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unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
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// Set the conditional execution predicate.
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Binary |= II->getPredicate(&MI) << ARMII::CondShift;
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Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
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// Set bit I(25) to identify this is the immediate form of <shifter_op>
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Binary |= 1 << ARMII::I_BitShift;
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Binary |= getMachineSoImmOpValue(V1);
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// Now the 'orr' instruction.
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Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
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// Set the conditional execution predicate.
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Binary |= II->getPredicate(&MI) << ARMII::CondShift;
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Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
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Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
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// Set bit I(25) to identify this is the immediate form of <shifter_op>
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Binary |= 1 << ARMII::I_BitShift;
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Binary |= getMachineSoImmOpValue(V2);
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void ARMCodeEmitter::emitLEApcrelJTInstruction(const MachineInstr &MI) {
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// It's basically add r, pc, (LJTI - $+8)
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const TargetInstrDesc &TID = MI.getDesc();
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// Emit the 'add' instruction.
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unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
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// Set the conditional execution predicate
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Binary |= II->getPredicate(&MI) << ARMII::CondShift;
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// Encode S bit if MI modifies CPSR.
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Binary |= getAddrModeSBit(MI, TID);
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Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
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// Encode Rn which is PC.
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Binary |= ARMRegisterInfo::getRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
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// Encode the displacement.
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Binary |= 1 << ARMII::I_BitShift;
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emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
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void ARMCodeEmitter::emitPseudoMoveInstruction(const MachineInstr &MI) {
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unsigned Opcode = MI.getDesc().Opcode;
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// Part of binary is determined by TableGn.
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unsigned Binary = getBinaryCodeForInstr(MI);
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// Set the conditional execution predicate
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Binary |= II->getPredicate(&MI) << ARMII::CondShift;
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// Encode S bit if MI modifies CPSR.
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if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
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Binary |= 1 << ARMII::S_BitShift;
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// Encode register def if there is one.
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Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
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// Encode the shift operation.
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case ARM::MOVsrl_flag:
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Binary |= (0x2 << 4) | (1 << 7);
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case ARM::MOVsra_flag:
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Binary |= (0x4 << 4) | (1 << 7);
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// Encode register Rm.
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Binary |= getMachineOpValue(MI, 1);
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void ARMCodeEmitter::addPCLabel(unsigned LabelID) {
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DEBUG(errs() << " ** LPC" << LabelID << " @ "
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<< (void*)MCE.getCurrentPCValue() << '\n');
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JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
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void ARMCodeEmitter::emitPseudoInstruction(const MachineInstr &MI) {
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unsigned Opcode = MI.getDesc().Opcode;
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llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
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// FIXME: Add support for MOVimm32.
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case TargetOpcode::INLINEASM: {
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// We allow inline assembler nodes with empty bodies - they can
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// implicitly define registers, which is ok for JIT.
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if (MI.getOperand(0).getSymbolName()[0]) {
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llvm_report_error("JIT does not support inline asm!");
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case TargetOpcode::DBG_LABEL:
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case TargetOpcode::EH_LABEL:
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MCE.emitLabel(MI.getOperand(0).getImm());
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case TargetOpcode::IMPLICIT_DEF:
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case TargetOpcode::KILL:
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case ARM::CONSTPOOL_ENTRY:
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emitConstPoolInstruction(MI);
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// Remember of the address of the PC label for relocation later.
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addPCLabel(MI.getOperand(2).getImm());
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// PICADD is just an add instruction that implicitly read pc.
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emitDataProcessingInstruction(MI, 0, ARM::PC);
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// Remember of the address of the PC label for relocation later.
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addPCLabel(MI.getOperand(2).getImm());
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// These are just load / store instructions that implicitly read pc.
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emitLoadStoreInstruction(MI, 0, ARM::PC);
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// Remember of the address of the PC label for relocation later.
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addPCLabel(MI.getOperand(2).getImm());
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// These are just load / store instructions that implicitly read pc.
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emitMiscLoadStoreInstruction(MI, ARM::PC);
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case ARM::MOVi2pieces:
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// Two instructions to materialize a constant.
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emitMOVi2piecesInstruction(MI);
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case ARM::LEApcrelJT:
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// Materialize jumptable address.
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emitLEApcrelJTInstruction(MI);
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case ARM::MOVsrl_flag:
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case ARM::MOVsra_flag:
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emitPseudoMoveInstruction(MI);
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unsigned ARMCodeEmitter::getMachineSoRegOpValue(
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const MachineInstr &MI,
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const TargetInstrDesc &TID,
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const MachineOperand &MO,
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unsigned Binary = getMachineOpValue(MI, MO);
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const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
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const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
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ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
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// Encode the shift opcode.
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unsigned Rs = MO1.getReg();
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// Set shift operand (bit[7:4]).
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// RRX - 0110 and bit[11:8] clear.
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default: llvm_unreachable("Unknown shift opc!");
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case ARM_AM::lsl: SBits = 0x1; break;
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case ARM_AM::lsr: SBits = 0x3; break;
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case ARM_AM::asr: SBits = 0x5; break;
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case ARM_AM::ror: SBits = 0x7; break;
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case ARM_AM::rrx: SBits = 0x6; break;
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// Set shift operand (bit[6:4]).
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default: llvm_unreachable("Unknown shift opc!");
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case ARM_AM::lsl: SBits = 0x0; break;
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case ARM_AM::lsr: SBits = 0x2; break;
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case ARM_AM::asr: SBits = 0x4; break;
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case ARM_AM::ror: SBits = 0x6; break;
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Binary |= SBits << 4;
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if (SOpc == ARM_AM::rrx)
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// Encode the shift operation Rs or shift_imm (except rrx).
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// Encode Rs bit[11:8].
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assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
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(ARMRegisterInfo::getRegisterNumbering(Rs) << ARMII::RegRsShift);
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// Encode shift_imm bit[11:7].
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return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
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unsigned ARMCodeEmitter::getMachineSoImmOpValue(unsigned SoImm) {
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int SoImmVal = ARM_AM::getSOImmVal(SoImm);
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assert(SoImmVal != -1 && "Not a valid so_imm value!");
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// Encode rotate_imm.
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unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
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<< ARMII::SoRotImmShift;
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Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
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unsigned ARMCodeEmitter::getAddrModeSBit(const MachineInstr &MI,
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const TargetInstrDesc &TID) const {
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for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
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const MachineOperand &MO = MI.getOperand(i-1);
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if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
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return 1 << ARMII::S_BitShift;
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void ARMCodeEmitter::emitDataProcessingInstruction(
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const MachineInstr &MI,
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unsigned ImplicitRn) {
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const TargetInstrDesc &TID = MI.getDesc();
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if (TID.Opcode == ARM::BFC) {
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llvm_report_error("ARMv6t2 JIT is not yet supported.");
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// Part of binary is determined by TableGn.
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unsigned Binary = getBinaryCodeForInstr(MI);
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// Set the conditional execution predicate
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Binary |= II->getPredicate(&MI) << ARMII::CondShift;
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// Encode S bit if MI modifies CPSR.
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Binary |= getAddrModeSBit(MI, TID);
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// Encode register def if there is one.
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unsigned NumDefs = TID.getNumDefs();
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Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
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// Special handling for implicit use (e.g. PC).
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Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
727
<< ARMII::RegRdShift);
729
// If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
730
if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
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// Encode first non-shifter register operand if there is one.
734
bool isUnary = TID.TSFlags & ARMII::UnaryDP;
737
// Special handling for implicit use (e.g. PC).
738
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
739
<< ARMII::RegRnShift);
741
Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
746
// Encode shifter operand.
747
const MachineOperand &MO = MI.getOperand(OpIdx);
748
if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
750
emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
755
// Encode register Rm.
756
emitWordLE(Binary | ARMRegisterInfo::getRegisterNumbering(MO.getReg()));
761
Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
766
void ARMCodeEmitter::emitLoadStoreInstruction(
767
const MachineInstr &MI,
769
unsigned ImplicitRn) {
770
const TargetInstrDesc &TID = MI.getDesc();
771
unsigned Form = TID.TSFlags & ARMII::FormMask;
772
bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
774
// Part of binary is determined by TableGn.
775
unsigned Binary = getBinaryCodeForInstr(MI);
777
// Set the conditional execution predicate
778
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
782
// Operand 0 of a pre- and post-indexed store is the address base
783
// writeback. Skip it.
784
bool Skipped = false;
785
if (IsPrePost && Form == ARMII::StFrm) {
792
// Special handling for implicit use (e.g. PC).
793
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
794
<< ARMII::RegRdShift);
796
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
798
// Set second operand
800
// Special handling for implicit use (e.g. PC).
801
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
802
<< ARMII::RegRnShift);
804
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
806
// If this is a two-address operand, skip it. e.g. LDR_PRE.
807
if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
810
const MachineOperand &MO2 = MI.getOperand(OpIdx);
811
unsigned AM2Opc = (ImplicitRn == ARM::PC)
812
? 0 : MI.getOperand(OpIdx+1).getImm();
814
// Set bit U(23) according to sign of immed value (positive or negative).
815
Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
817
if (!MO2.getReg()) { // is immediate
818
if (ARM_AM::getAM2Offset(AM2Opc))
819
// Set the value of offset_12 field
820
Binary |= ARM_AM::getAM2Offset(AM2Opc);
825
// Set bit I(25), because this is not in immediate enconding.
826
Binary |= 1 << ARMII::I_BitShift;
827
assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
828
// Set bit[3:0] to the corresponding Rm register
829
Binary |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
831
// If this instr is in scaled register offset/index instruction, set
832
// shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
833
if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
834
Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
835
Binary |= ShImm << ARMII::ShiftShift; // shift_immed
841
void ARMCodeEmitter::emitMiscLoadStoreInstruction(const MachineInstr &MI,
842
unsigned ImplicitRn) {
843
const TargetInstrDesc &TID = MI.getDesc();
844
unsigned Form = TID.TSFlags & ARMII::FormMask;
845
bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
847
// Part of binary is determined by TableGn.
848
unsigned Binary = getBinaryCodeForInstr(MI);
850
// Set the conditional execution predicate
851
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
855
// Operand 0 of a pre- and post-indexed store is the address base
856
// writeback. Skip it.
857
bool Skipped = false;
858
if (IsPrePost && Form == ARMII::StMiscFrm) {
864
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
866
// Skip LDRD and STRD's second operand.
867
if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
870
// Set second operand
872
// Special handling for implicit use (e.g. PC).
873
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
874
<< ARMII::RegRnShift);
876
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
878
// If this is a two-address operand, skip it. e.g. LDRH_POST.
879
if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
882
const MachineOperand &MO2 = MI.getOperand(OpIdx);
883
unsigned AM3Opc = (ImplicitRn == ARM::PC)
884
? 0 : MI.getOperand(OpIdx+1).getImm();
886
// Set bit U(23) according to sign of immed value (positive or negative)
887
Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
890
// If this instr is in register offset/index encoding, set bit[3:0]
891
// to the corresponding Rm register.
893
Binary |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
898
// This instr is in immediate offset/index encoding, set bit 22 to 1.
899
Binary |= 1 << ARMII::AM3_I_BitShift;
900
if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
902
Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
903
Binary |= (ImmOffs & 0xF); // immedL
909
static unsigned getAddrModeUPBits(unsigned Mode) {
912
// Set addressing mode by modifying bits U(23) and P(24)
913
// IA - Increment after - bit U = 1 and bit P = 0
914
// IB - Increment before - bit U = 1 and bit P = 1
915
// DA - Decrement after - bit U = 0 and bit P = 0
916
// DB - Decrement before - bit U = 0 and bit P = 1
918
default: llvm_unreachable("Unknown addressing sub-mode!");
919
case ARM_AM::da: break;
920
case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
921
case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
922
case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
928
void ARMCodeEmitter::emitLoadStoreMultipleInstruction(
929
const MachineInstr &MI) {
930
// Part of binary is determined by TableGn.
931
unsigned Binary = getBinaryCodeForInstr(MI);
933
// Set the conditional execution predicate
934
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
936
// Set base address operand
937
Binary |= getMachineOpValue(MI, 0) << ARMII::RegRnShift;
939
// Set addressing mode by modifying bits U(23) and P(24)
940
const MachineOperand &MO = MI.getOperand(1);
941
Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
944
if (ARM_AM::getAM4WBFlag(MO.getImm()))
945
Binary |= 0x1 << ARMII::W_BitShift;
948
for (unsigned i = 5, e = MI.getNumOperands(); i != e; ++i) {
949
const MachineOperand &MO = MI.getOperand(i);
950
if (!MO.isReg() || MO.isImplicit())
952
unsigned RegNum = ARMRegisterInfo::getRegisterNumbering(MO.getReg());
953
assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
955
Binary |= 0x1 << RegNum;
961
void ARMCodeEmitter::emitMulFrmInstruction(const MachineInstr &MI) {
962
const TargetInstrDesc &TID = MI.getDesc();
964
// Part of binary is determined by TableGn.
965
unsigned Binary = getBinaryCodeForInstr(MI);
967
// Set the conditional execution predicate
968
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
970
// Encode S bit if MI modifies CPSR.
971
Binary |= getAddrModeSBit(MI, TID);
973
// 32x32->64bit operations have two destination registers. The number
974
// of register definitions will tell us if that's what we're dealing with.
976
if (TID.getNumDefs() == 2)
977
Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
980
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
983
Binary |= getMachineOpValue(MI, OpIdx++);
986
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
988
// Many multiple instructions (e.g. MLA) have three src operands. Encode
989
// it as Rn (for multiply, that's in the same offset as RdLo.
990
if (TID.getNumOperands() > OpIdx &&
991
!TID.OpInfo[OpIdx].isPredicate() &&
992
!TID.OpInfo[OpIdx].isOptionalDef())
993
Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
998
void ARMCodeEmitter::emitExtendInstruction(const MachineInstr &MI) {
999
const TargetInstrDesc &TID = MI.getDesc();
1001
// Part of binary is determined by TableGn.
1002
unsigned Binary = getBinaryCodeForInstr(MI);
1004
// Set the conditional execution predicate
1005
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1010
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1012
const MachineOperand &MO1 = MI.getOperand(OpIdx++);
1013
const MachineOperand &MO2 = MI.getOperand(OpIdx);
1015
// Two register operand form.
1017
Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
1020
Binary |= getMachineOpValue(MI, MO2);
1023
Binary |= getMachineOpValue(MI, MO1);
1026
// Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
1027
if (MI.getOperand(OpIdx).isImm() &&
1028
!TID.OpInfo[OpIdx].isPredicate() &&
1029
!TID.OpInfo[OpIdx].isOptionalDef())
1030
Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
1035
void ARMCodeEmitter::emitMiscArithInstruction(const MachineInstr &MI) {
1036
const TargetInstrDesc &TID = MI.getDesc();
1038
// Part of binary is determined by TableGn.
1039
unsigned Binary = getBinaryCodeForInstr(MI);
1041
// Set the conditional execution predicate
1042
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1047
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
1049
const MachineOperand &MO = MI.getOperand(OpIdx++);
1050
if (OpIdx == TID.getNumOperands() ||
1051
TID.OpInfo[OpIdx].isPredicate() ||
1052
TID.OpInfo[OpIdx].isOptionalDef()) {
1053
// Encode Rm and it's done.
1054
Binary |= getMachineOpValue(MI, MO);
1060
Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
1063
Binary |= getMachineOpValue(MI, OpIdx++);
1065
// Encode shift_imm.
1066
unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
1067
assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
1068
Binary |= ShiftAmt << ARMII::ShiftShift;
1073
void ARMCodeEmitter::emitBranchInstruction(const MachineInstr &MI) {
1074
const TargetInstrDesc &TID = MI.getDesc();
1076
if (TID.Opcode == ARM::TPsoft) {
1077
llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
1080
// Part of binary is determined by TableGn.
1081
unsigned Binary = getBinaryCodeForInstr(MI);
1083
// Set the conditional execution predicate
1084
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1086
// Set signed_immed_24 field
1087
Binary |= getMachineOpValue(MI, 0);
1092
void ARMCodeEmitter::emitInlineJumpTable(unsigned JTIndex) {
1093
// Remember the base address of the inline jump table.
1094
uintptr_t JTBase = MCE.getCurrentPCValue();
1095
JTI->addJumpTableBaseAddr(JTIndex, JTBase);
1096
DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
1099
// Now emit the jump table entries.
1100
const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
1101
for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
1103
// DestBB address - JT base.
1104
emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
1106
// Absolute DestBB address.
1107
emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
1112
void ARMCodeEmitter::emitMiscBranchInstruction(const MachineInstr &MI) {
1113
const TargetInstrDesc &TID = MI.getDesc();
1115
// Handle jump tables.
1116
if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
1117
// First emit a ldr pc, [] instruction.
1118
emitDataProcessingInstruction(MI, ARM::PC);
1120
// Then emit the inline jump table.
1122
(TID.Opcode == ARM::BR_JTr)
1123
? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
1124
emitInlineJumpTable(JTIndex);
1126
} else if (TID.Opcode == ARM::BR_JTm) {
1127
// First emit a ldr pc, [] instruction.
1128
emitLoadStoreInstruction(MI, ARM::PC);
1130
// Then emit the inline jump table.
1131
emitInlineJumpTable(MI.getOperand(3).getIndex());
1135
// Part of binary is determined by TableGn.
1136
unsigned Binary = getBinaryCodeForInstr(MI);
1138
// Set the conditional execution predicate
1139
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1141
if (TID.Opcode == ARM::BX_RET)
1142
// The return register is LR.
1143
Binary |= ARMRegisterInfo::getRegisterNumbering(ARM::LR);
1145
// otherwise, set the return register
1146
Binary |= getMachineOpValue(MI, 0);
1151
static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
1152
unsigned RegD = MI.getOperand(OpIdx).getReg();
1153
unsigned Binary = 0;
1154
bool isSPVFP = false;
1155
RegD = ARMRegisterInfo::getRegisterNumbering(RegD, &isSPVFP);
1157
Binary |= RegD << ARMII::RegRdShift;
1159
Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
1160
Binary |= (RegD & 0x01) << ARMII::D_BitShift;
1165
static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
1166
unsigned RegN = MI.getOperand(OpIdx).getReg();
1167
unsigned Binary = 0;
1168
bool isSPVFP = false;
1169
RegN = ARMRegisterInfo::getRegisterNumbering(RegN, &isSPVFP);
1171
Binary |= RegN << ARMII::RegRnShift;
1173
Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
1174
Binary |= (RegN & 0x01) << ARMII::N_BitShift;
1179
static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
1180
unsigned RegM = MI.getOperand(OpIdx).getReg();
1181
unsigned Binary = 0;
1182
bool isSPVFP = false;
1183
RegM = ARMRegisterInfo::getRegisterNumbering(RegM, &isSPVFP);
1187
Binary |= ((RegM & 0x1E) >> 1);
1188
Binary |= (RegM & 0x01) << ARMII::M_BitShift;
1193
void ARMCodeEmitter::emitVFPArithInstruction(const MachineInstr &MI) {
1194
const TargetInstrDesc &TID = MI.getDesc();
1196
// Part of binary is determined by TableGn.
1197
unsigned Binary = getBinaryCodeForInstr(MI);
1199
// Set the conditional execution predicate
1200
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1203
assert((Binary & ARMII::D_BitShift) == 0 &&
1204
(Binary & ARMII::N_BitShift) == 0 &&
1205
(Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
1208
Binary |= encodeVFPRd(MI, OpIdx++);
1210
// If this is a two-address operand, skip it, e.g. FMACD.
1211
if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
1215
if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
1216
Binary |= encodeVFPRn(MI, OpIdx++);
1218
if (OpIdx == TID.getNumOperands() ||
1219
TID.OpInfo[OpIdx].isPredicate() ||
1220
TID.OpInfo[OpIdx].isOptionalDef()) {
1221
// FCMPEZD etc. has only one operand.
1227
Binary |= encodeVFPRm(MI, OpIdx);
1232
void ARMCodeEmitter::emitVFPConversionInstruction(
1233
const MachineInstr &MI) {
1234
const TargetInstrDesc &TID = MI.getDesc();
1235
unsigned Form = TID.TSFlags & ARMII::FormMask;
1237
// Part of binary is determined by TableGn.
1238
unsigned Binary = getBinaryCodeForInstr(MI);
1240
// Set the conditional execution predicate
1241
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1245
case ARMII::VFPConv1Frm:
1246
case ARMII::VFPConv2Frm:
1247
case ARMII::VFPConv3Frm:
1249
Binary |= encodeVFPRd(MI, 0);
1251
case ARMII::VFPConv4Frm:
1253
Binary |= encodeVFPRn(MI, 0);
1255
case ARMII::VFPConv5Frm:
1257
Binary |= encodeVFPRm(MI, 0);
1263
case ARMII::VFPConv1Frm:
1265
Binary |= encodeVFPRm(MI, 1);
1267
case ARMII::VFPConv2Frm:
1268
case ARMII::VFPConv3Frm:
1270
Binary |= encodeVFPRn(MI, 1);
1272
case ARMII::VFPConv4Frm:
1273
case ARMII::VFPConv5Frm:
1275
Binary |= encodeVFPRd(MI, 1);
1279
if (Form == ARMII::VFPConv5Frm)
1281
Binary |= encodeVFPRn(MI, 2);
1282
else if (Form == ARMII::VFPConv3Frm)
1284
Binary |= encodeVFPRm(MI, 2);
1289
void ARMCodeEmitter::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
1290
// Part of binary is determined by TableGn.
1291
unsigned Binary = getBinaryCodeForInstr(MI);
1293
// Set the conditional execution predicate
1294
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1299
Binary |= encodeVFPRd(MI, OpIdx++);
1301
// Encode address base.
1302
const MachineOperand &Base = MI.getOperand(OpIdx++);
1303
Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
1305
// If there is a non-zero immediate offset, encode it.
1307
const MachineOperand &Offset = MI.getOperand(OpIdx);
1308
if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
1309
if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
1310
Binary |= 1 << ARMII::U_BitShift;
1317
// If immediate offset is omitted, default to +0.
1318
Binary |= 1 << ARMII::U_BitShift;
1323
void ARMCodeEmitter::emitVFPLoadStoreMultipleInstruction(
1324
const MachineInstr &MI) {
1325
// Part of binary is determined by TableGn.
1326
unsigned Binary = getBinaryCodeForInstr(MI);
1328
// Set the conditional execution predicate
1329
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1331
// Set base address operand
1332
Binary |= getMachineOpValue(MI, 0) << ARMII::RegRnShift;
1334
// Set addressing mode by modifying bits U(23) and P(24)
1335
const MachineOperand &MO = MI.getOperand(1);
1336
Binary |= getAddrModeUPBits(ARM_AM::getAM5SubMode(MO.getImm()));
1339
if (ARM_AM::getAM5WBFlag(MO.getImm()))
1340
Binary |= 0x1 << ARMII::W_BitShift;
1342
// First register is encoded in Dd.
1343
Binary |= encodeVFPRd(MI, 5);
1345
// Number of registers are encoded in offset field.
1346
unsigned NumRegs = 1;
1347
for (unsigned i = 6, e = MI.getNumOperands(); i != e; ++i) {
1348
const MachineOperand &MO = MI.getOperand(i);
1349
if (!MO.isReg() || MO.isImplicit())
1353
Binary |= NumRegs * 2;
1358
void ARMCodeEmitter::emitMiscInstruction(const MachineInstr &MI) {
1359
// Part of binary is determined by TableGn.
1360
unsigned Binary = getBinaryCodeForInstr(MI);
1362
// Set the conditional execution predicate
1363
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
1368
#include "ARMGenCodeEmitter.inc"