mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-27 15:29:51 +00:00
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83363 91177308-0d34-0410-b5e6-96231b3b80d8
1434 lines
46 KiB
C++
1434 lines
46 KiB
C++
//===-- ARM/ARMCodeEmitter.cpp - Convert ARM code to machine code ---------===//
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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 pass that transforms the ARM machine instructions into
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// relocatable machine code.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "jit"
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#include "ARM.h"
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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/MachineCodeEmitter.h"
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#include "llvm/CodeGen/JITCodeEmitter.h"
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#include "llvm/CodeGen/ObjectCodeEmitter.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/Compiler.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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#ifndef NDEBUG
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#include <iomanip>
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#endif
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using namespace llvm;
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STATISTIC(NumEmitted, "Number of machine instructions emitted");
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namespace {
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class ARMCodeEmitter {
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public:
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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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};
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template<class CodeEmitter>
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class VISIBILITY_HIDDEN Emitter : public MachineFunctionPass,
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public ARMCodeEmitter {
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ARMJITInfo *JTI;
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const ARMInstrInfo *II;
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const TargetData *TD;
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const ARMSubtarget *Subtarget;
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TargetMachine &TM;
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CodeEmitter &MCE;
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const std::vector<MachineConstantPoolEntry> *MCPEs;
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const std::vector<MachineJumpTableEntry> *MJTEs;
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bool IsPIC;
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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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}
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public:
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static char ID;
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explicit Emitter(TargetMachine &tm, CodeEmitter &mce)
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: MachineFunctionPass(&ID), JTI(0), II(0), TD(0), 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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Emitter(TargetMachine &tm, CodeEmitter &mce,
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const ARMInstrInfo &ii, const TargetData &td)
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: MachineFunctionPass(&ID), JTI(0), II(&ii), TD(&td), 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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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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}
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void emitInstruction(const MachineInstr &MI);
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private:
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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 OpIdx);
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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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}
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/// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
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///
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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 NeedStub, bool Indirect, intptr_t ACPV = 0);
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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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};
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template <class CodeEmitter>
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char Emitter<CodeEmitter>::ID = 0;
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}
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/// createARMCodeEmitterPass - Return a pass that emits the collected ARM code
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/// to the specified MCE object.
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FunctionPass *llvm::createARMCodeEmitterPass(ARMBaseTargetMachine &TM,
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MachineCodeEmitter &MCE) {
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return new Emitter<MachineCodeEmitter>(TM, MCE);
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}
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FunctionPass *llvm::createARMJITCodeEmitterPass(ARMBaseTargetMachine &TM,
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JITCodeEmitter &JCE) {
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return new Emitter<JITCodeEmitter>(TM, JCE);
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}
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FunctionPass *llvm::createARMObjectCodeEmitterPass(ARMBaseTargetMachine &TM,
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ObjectCodeEmitter &OCE) {
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return new Emitter<ObjectCodeEmitter>(TM, OCE);
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}
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template<class CodeEmitter>
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bool Emitter<CodeEmitter>::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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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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do {
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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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MBB != E; ++MBB) {
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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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I != E; ++I)
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emitInstruction(*I);
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}
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} while (MCE.finishFunction(MF));
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return false;
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}
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/// getShiftOp - Return the shift opcode (bit[6:5]) of the immediate value.
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///
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template<class CodeEmitter>
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unsigned Emitter<CodeEmitter>::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::ror:
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case ARM_AM::rrx: return 3;
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}
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return 0;
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}
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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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template<class CodeEmitter>
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unsigned Emitter<CodeEmitter>::getMachineOpValue(const MachineInstr &MI,
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const MachineOperand &MO) {
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if (MO.isReg())
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return ARMRegisterInfo::getRegisterNumbering(MO.getReg());
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else if (MO.isImm())
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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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else if (MO.isMBB())
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emitMachineBasicBlock(MO.getMBB(), ARM::reloc_arm_branch);
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else {
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#ifndef NDEBUG
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errs() << MO;
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#endif
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llvm_unreachable(0);
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}
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return 0;
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}
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/// emitGlobalAddress - Emit the specified address to the code stream.
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///
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::emitGlobalAddress(GlobalValue *GV, unsigned Reloc,
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bool NeedStub, bool Indirect,
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intptr_t ACPV) {
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MachineRelocation MR = Indirect
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? MachineRelocation::getIndirectSymbol(MCE.getCurrentPCOffset(), Reloc,
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GV, ACPV, NeedStub)
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: MachineRelocation::getGV(MCE.getCurrentPCOffset(), Reloc,
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GV, ACPV, NeedStub);
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MCE.addRelocation(MR);
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}
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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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/// relative.
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::emitExternalSymbolAddress(const char *ES,
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unsigned Reloc) {
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MCE.addRelocation(MachineRelocation::getExtSym(MCE.getCurrentPCOffset(),
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Reloc, ES));
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}
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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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/// relative.
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::emitConstPoolAddress(unsigned CPI,
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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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}
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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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/// relative.
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::emitJumpTableAddress(unsigned JTIndex,
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unsigned Reloc) {
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MCE.addRelocation(MachineRelocation::getJumpTable(MCE.getCurrentPCOffset(),
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Reloc, JTIndex, 0, true));
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}
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/// emitMachineBasicBlock - Emit the specified address basic block.
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::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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Reloc, BB, JTBase));
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}
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::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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}
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::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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}
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::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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default: {
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llvm_unreachable("Unhandled instruction encoding format!");
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break;
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}
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case ARMII::Pseudo:
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emitPseudoInstruction(MI);
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break;
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case ARMII::DPFrm:
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case ARMII::DPSoRegFrm:
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emitDataProcessingInstruction(MI);
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break;
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case ARMII::LdFrm:
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case ARMII::StFrm:
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emitLoadStoreInstruction(MI);
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break;
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case ARMII::LdMiscFrm:
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case ARMII::StMiscFrm:
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emitMiscLoadStoreInstruction(MI);
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break;
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case ARMII::LdStMulFrm:
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emitLoadStoreMultipleInstruction(MI);
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break;
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case ARMII::MulFrm:
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emitMulFrmInstruction(MI);
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break;
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case ARMII::ExtFrm:
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emitExtendInstruction(MI);
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break;
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case ARMII::ArithMiscFrm:
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emitMiscArithInstruction(MI);
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break;
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case ARMII::BrFrm:
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emitBranchInstruction(MI);
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break;
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case ARMII::BrMiscFrm:
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emitMiscBranchInstruction(MI);
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break;
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// VFP instructions.
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case ARMII::VFPUnaryFrm:
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case ARMII::VFPBinaryFrm:
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emitVFPArithInstruction(MI);
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break;
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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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break;
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case ARMII::VFPLdStFrm:
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emitVFPLoadStoreInstruction(MI);
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break;
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case ARMII::VFPLdStMulFrm:
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emitVFPLoadStoreMultipleInstruction(MI);
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break;
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case ARMII::VFPMiscFrm:
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emitMiscInstruction(MI);
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break;
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}
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MCE.processDebugLoc(MI.getDebugLoc(), false);
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}
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template<class CodeEmitter>
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void Emitter<CodeEmitter>::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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GlobalValue *GV = ACPV->getGV();
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if (GV) {
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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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isa<Function>(GV),
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Subtarget->GVIsIndirectSymbol(GV, RelocM),
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(intptr_t)ACPV);
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} else {
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emitExternalSymbolAddress(ACPV->getSymbol(), ARM::reloc_arm_absolute);
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}
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emitWordLE(0);
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} else {
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Constant *CV = MCPE.Val.ConstVal;
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DEBUG({
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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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else
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errs() << *CV;
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errs() << '\n';
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});
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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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emitWordLE(0);
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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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emitWordLE(Val);
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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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else {
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llvm_unreachable("Unable to handle this constantpool entry!");
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}
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} else {
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llvm_unreachable("Unable to handle this constantpool entry!");
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}
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}
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}
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template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitMOVi2piecesInstruction(const MachineInstr &MI) {
|
|
const MachineOperand &MO0 = MI.getOperand(0);
|
|
const MachineOperand &MO1 = MI.getOperand(1);
|
|
assert(MO1.isImm() && ARM_AM::getSOImmVal(MO1.isImm()) != -1 &&
|
|
"Not a valid so_imm value!");
|
|
unsigned V1 = ARM_AM::getSOImmTwoPartFirst(MO1.getImm());
|
|
unsigned V2 = ARM_AM::getSOImmTwoPartSecond(MO1.getImm());
|
|
|
|
// Emit the 'mov' instruction.
|
|
unsigned Binary = 0xd << 21; // mov: Insts{24-21} = 0b1101
|
|
|
|
// Set the conditional execution predicate.
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Encode Rd.
|
|
Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
|
|
|
|
// Encode so_imm.
|
|
// Set bit I(25) to identify this is the immediate form of <shifter_op>
|
|
Binary |= 1 << ARMII::I_BitShift;
|
|
Binary |= getMachineSoImmOpValue(V1);
|
|
emitWordLE(Binary);
|
|
|
|
// Now the 'orr' instruction.
|
|
Binary = 0xc << 21; // orr: Insts{24-21} = 0b1100
|
|
|
|
// Set the conditional execution predicate.
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Encode Rd.
|
|
Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRdShift;
|
|
|
|
// Encode Rn.
|
|
Binary |= getMachineOpValue(MI, MO0) << ARMII::RegRnShift;
|
|
|
|
// Encode so_imm.
|
|
// Set bit I(25) to identify this is the immediate form of <shifter_op>
|
|
Binary |= 1 << ARMII::I_BitShift;
|
|
Binary |= getMachineSoImmOpValue(V2);
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitLEApcrelJTInstruction(const MachineInstr &MI) {
|
|
// It's basically add r, pc, (LJTI - $+8)
|
|
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
// Emit the 'add' instruction.
|
|
unsigned Binary = 0x4 << 21; // add: Insts{24-31} = 0b0100
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Encode S bit if MI modifies CPSR.
|
|
Binary |= getAddrModeSBit(MI, TID);
|
|
|
|
// Encode Rd.
|
|
Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
|
|
|
|
// Encode Rn which is PC.
|
|
Binary |= ARMRegisterInfo::getRegisterNumbering(ARM::PC) << ARMII::RegRnShift;
|
|
|
|
// Encode the displacement.
|
|
Binary |= 1 << ARMII::I_BitShift;
|
|
emitJumpTableAddress(MI.getOperand(1).getIndex(), ARM::reloc_arm_jt_base);
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitPseudoMoveInstruction(const MachineInstr &MI) {
|
|
unsigned Opcode = MI.getDesc().Opcode;
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Encode S bit if MI modifies CPSR.
|
|
if (Opcode == ARM::MOVsrl_flag || Opcode == ARM::MOVsra_flag)
|
|
Binary |= 1 << ARMII::S_BitShift;
|
|
|
|
// Encode register def if there is one.
|
|
Binary |= getMachineOpValue(MI, 0) << ARMII::RegRdShift;
|
|
|
|
// Encode the shift operation.
|
|
switch (Opcode) {
|
|
default: break;
|
|
case ARM::MOVrx:
|
|
// rrx
|
|
Binary |= 0x6 << 4;
|
|
break;
|
|
case ARM::MOVsrl_flag:
|
|
// lsr #1
|
|
Binary |= (0x2 << 4) | (1 << 7);
|
|
break;
|
|
case ARM::MOVsra_flag:
|
|
// asr #1
|
|
Binary |= (0x4 << 4) | (1 << 7);
|
|
break;
|
|
}
|
|
|
|
// Encode register Rm.
|
|
Binary |= getMachineOpValue(MI, 1);
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::addPCLabel(unsigned LabelID) {
|
|
DEBUG(errs() << " ** LPC" << LabelID << " @ "
|
|
<< (void*)MCE.getCurrentPCValue() << '\n');
|
|
JTI->addPCLabelAddr(LabelID, MCE.getCurrentPCValue());
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitPseudoInstruction(const MachineInstr &MI) {
|
|
unsigned Opcode = MI.getDesc().Opcode;
|
|
switch (Opcode) {
|
|
default:
|
|
llvm_unreachable("ARMCodeEmitter::emitPseudoInstruction");
|
|
// FIXME: Add support for MOVimm32.
|
|
case TargetInstrInfo::INLINEASM: {
|
|
// We allow inline assembler nodes with empty bodies - they can
|
|
// implicitly define registers, which is ok for JIT.
|
|
if (MI.getOperand(0).getSymbolName()[0]) {
|
|
llvm_report_error("JIT does not support inline asm!");
|
|
}
|
|
break;
|
|
}
|
|
case TargetInstrInfo::DBG_LABEL:
|
|
case TargetInstrInfo::EH_LABEL:
|
|
MCE.emitLabel(MI.getOperand(0).getImm());
|
|
break;
|
|
case TargetInstrInfo::IMPLICIT_DEF:
|
|
case TargetInstrInfo::KILL:
|
|
case ARM::DWARF_LOC:
|
|
// Do nothing.
|
|
break;
|
|
case ARM::CONSTPOOL_ENTRY:
|
|
emitConstPoolInstruction(MI);
|
|
break;
|
|
case ARM::PICADD: {
|
|
// Remember of the address of the PC label for relocation later.
|
|
addPCLabel(MI.getOperand(2).getImm());
|
|
// PICADD is just an add instruction that implicitly read pc.
|
|
emitDataProcessingInstruction(MI, 0, ARM::PC);
|
|
break;
|
|
}
|
|
case ARM::PICLDR:
|
|
case ARM::PICLDRB:
|
|
case ARM::PICSTR:
|
|
case ARM::PICSTRB: {
|
|
// Remember of the address of the PC label for relocation later.
|
|
addPCLabel(MI.getOperand(2).getImm());
|
|
// These are just load / store instructions that implicitly read pc.
|
|
emitLoadStoreInstruction(MI, 0, ARM::PC);
|
|
break;
|
|
}
|
|
case ARM::PICLDRH:
|
|
case ARM::PICLDRSH:
|
|
case ARM::PICLDRSB:
|
|
case ARM::PICSTRH: {
|
|
// Remember of the address of the PC label for relocation later.
|
|
addPCLabel(MI.getOperand(2).getImm());
|
|
// These are just load / store instructions that implicitly read pc.
|
|
emitMiscLoadStoreInstruction(MI, ARM::PC);
|
|
break;
|
|
}
|
|
case ARM::MOVi2pieces:
|
|
// Two instructions to materialize a constant.
|
|
emitMOVi2piecesInstruction(MI);
|
|
break;
|
|
case ARM::LEApcrelJT:
|
|
// Materialize jumptable address.
|
|
emitLEApcrelJTInstruction(MI);
|
|
break;
|
|
case ARM::MOVrx:
|
|
case ARM::MOVsrl_flag:
|
|
case ARM::MOVsra_flag:
|
|
emitPseudoMoveInstruction(MI);
|
|
break;
|
|
}
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
unsigned Emitter<CodeEmitter>::getMachineSoRegOpValue(
|
|
const MachineInstr &MI,
|
|
const TargetInstrDesc &TID,
|
|
const MachineOperand &MO,
|
|
unsigned OpIdx) {
|
|
unsigned Binary = getMachineOpValue(MI, MO);
|
|
|
|
const MachineOperand &MO1 = MI.getOperand(OpIdx + 1);
|
|
const MachineOperand &MO2 = MI.getOperand(OpIdx + 2);
|
|
ARM_AM::ShiftOpc SOpc = ARM_AM::getSORegShOp(MO2.getImm());
|
|
|
|
// Encode the shift opcode.
|
|
unsigned SBits = 0;
|
|
unsigned Rs = MO1.getReg();
|
|
if (Rs) {
|
|
// Set shift operand (bit[7:4]).
|
|
// LSL - 0001
|
|
// LSR - 0011
|
|
// ASR - 0101
|
|
// ROR - 0111
|
|
// RRX - 0110 and bit[11:8] clear.
|
|
switch (SOpc) {
|
|
default: llvm_unreachable("Unknown shift opc!");
|
|
case ARM_AM::lsl: SBits = 0x1; break;
|
|
case ARM_AM::lsr: SBits = 0x3; break;
|
|
case ARM_AM::asr: SBits = 0x5; break;
|
|
case ARM_AM::ror: SBits = 0x7; break;
|
|
case ARM_AM::rrx: SBits = 0x6; break;
|
|
}
|
|
} else {
|
|
// Set shift operand (bit[6:4]).
|
|
// LSL - 000
|
|
// LSR - 010
|
|
// ASR - 100
|
|
// ROR - 110
|
|
switch (SOpc) {
|
|
default: llvm_unreachable("Unknown shift opc!");
|
|
case ARM_AM::lsl: SBits = 0x0; break;
|
|
case ARM_AM::lsr: SBits = 0x2; break;
|
|
case ARM_AM::asr: SBits = 0x4; break;
|
|
case ARM_AM::ror: SBits = 0x6; break;
|
|
}
|
|
}
|
|
Binary |= SBits << 4;
|
|
if (SOpc == ARM_AM::rrx)
|
|
return Binary;
|
|
|
|
// Encode the shift operation Rs or shift_imm (except rrx).
|
|
if (Rs) {
|
|
// Encode Rs bit[11:8].
|
|
assert(ARM_AM::getSORegOffset(MO2.getImm()) == 0);
|
|
return Binary |
|
|
(ARMRegisterInfo::getRegisterNumbering(Rs) << ARMII::RegRsShift);
|
|
}
|
|
|
|
// Encode shift_imm bit[11:7].
|
|
return Binary | ARM_AM::getSORegOffset(MO2.getImm()) << 7;
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
unsigned Emitter<CodeEmitter>::getMachineSoImmOpValue(unsigned SoImm) {
|
|
int SoImmVal = ARM_AM::getSOImmVal(SoImm);
|
|
assert(SoImmVal != -1 && "Not a valid so_imm value!");
|
|
|
|
// Encode rotate_imm.
|
|
unsigned Binary = (ARM_AM::getSOImmValRot((unsigned)SoImmVal) >> 1)
|
|
<< ARMII::SoRotImmShift;
|
|
|
|
// Encode immed_8.
|
|
Binary |= ARM_AM::getSOImmValImm((unsigned)SoImmVal);
|
|
return Binary;
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
unsigned Emitter<CodeEmitter>::getAddrModeSBit(const MachineInstr &MI,
|
|
const TargetInstrDesc &TID) const {
|
|
for (unsigned i = MI.getNumOperands(), e = TID.getNumOperands(); i != e; --i){
|
|
const MachineOperand &MO = MI.getOperand(i-1);
|
|
if (MO.isReg() && MO.isDef() && MO.getReg() == ARM::CPSR)
|
|
return 1 << ARMII::S_BitShift;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitDataProcessingInstruction(
|
|
const MachineInstr &MI,
|
|
unsigned ImplicitRd,
|
|
unsigned ImplicitRn) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
if (TID.Opcode == ARM::BFC) {
|
|
llvm_report_error("ARMv6t2 JIT is not yet supported.");
|
|
}
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Encode S bit if MI modifies CPSR.
|
|
Binary |= getAddrModeSBit(MI, TID);
|
|
|
|
// Encode register def if there is one.
|
|
unsigned NumDefs = TID.getNumDefs();
|
|
unsigned OpIdx = 0;
|
|
if (NumDefs)
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
|
|
else if (ImplicitRd)
|
|
// Special handling for implicit use (e.g. PC).
|
|
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
|
|
<< ARMII::RegRdShift);
|
|
|
|
// If this is a two-address operand, skip it. e.g. MOVCCr operand 1.
|
|
if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
|
|
++OpIdx;
|
|
|
|
// Encode first non-shifter register operand if there is one.
|
|
bool isUnary = TID.TSFlags & ARMII::UnaryDP;
|
|
if (!isUnary) {
|
|
if (ImplicitRn)
|
|
// Special handling for implicit use (e.g. PC).
|
|
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
|
|
<< ARMII::RegRnShift);
|
|
else {
|
|
Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRnShift;
|
|
++OpIdx;
|
|
}
|
|
}
|
|
|
|
// Encode shifter operand.
|
|
const MachineOperand &MO = MI.getOperand(OpIdx);
|
|
if ((TID.TSFlags & ARMII::FormMask) == ARMII::DPSoRegFrm) {
|
|
// Encode SoReg.
|
|
emitWordLE(Binary | getMachineSoRegOpValue(MI, TID, MO, OpIdx));
|
|
return;
|
|
}
|
|
|
|
if (MO.isReg()) {
|
|
// Encode register Rm.
|
|
emitWordLE(Binary | ARMRegisterInfo::getRegisterNumbering(MO.getReg()));
|
|
return;
|
|
}
|
|
|
|
// Encode so_imm.
|
|
Binary |= getMachineSoImmOpValue((unsigned)MO.getImm());
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitLoadStoreInstruction(
|
|
const MachineInstr &MI,
|
|
unsigned ImplicitRd,
|
|
unsigned ImplicitRn) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
unsigned Form = TID.TSFlags & ARMII::FormMask;
|
|
bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
unsigned OpIdx = 0;
|
|
|
|
// Operand 0 of a pre- and post-indexed store is the address base
|
|
// writeback. Skip it.
|
|
bool Skipped = false;
|
|
if (IsPrePost && Form == ARMII::StFrm) {
|
|
++OpIdx;
|
|
Skipped = true;
|
|
}
|
|
|
|
// Set first operand
|
|
if (ImplicitRd)
|
|
// Special handling for implicit use (e.g. PC).
|
|
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRd)
|
|
<< ARMII::RegRdShift);
|
|
else
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
|
|
|
|
// Set second operand
|
|
if (ImplicitRn)
|
|
// Special handling for implicit use (e.g. PC).
|
|
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
|
|
<< ARMII::RegRnShift);
|
|
else
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
|
|
|
|
// If this is a two-address operand, skip it. e.g. LDR_PRE.
|
|
if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
|
|
++OpIdx;
|
|
|
|
const MachineOperand &MO2 = MI.getOperand(OpIdx);
|
|
unsigned AM2Opc = (ImplicitRn == ARM::PC)
|
|
? 0 : MI.getOperand(OpIdx+1).getImm();
|
|
|
|
// Set bit U(23) according to sign of immed value (positive or negative).
|
|
Binary |= ((ARM_AM::getAM2Op(AM2Opc) == ARM_AM::add ? 1 : 0) <<
|
|
ARMII::U_BitShift);
|
|
if (!MO2.getReg()) { // is immediate
|
|
if (ARM_AM::getAM2Offset(AM2Opc))
|
|
// Set the value of offset_12 field
|
|
Binary |= ARM_AM::getAM2Offset(AM2Opc);
|
|
emitWordLE(Binary);
|
|
return;
|
|
}
|
|
|
|
// Set bit I(25), because this is not in immediate enconding.
|
|
Binary |= 1 << ARMII::I_BitShift;
|
|
assert(TargetRegisterInfo::isPhysicalRegister(MO2.getReg()));
|
|
// Set bit[3:0] to the corresponding Rm register
|
|
Binary |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
|
|
|
|
// If this instr is in scaled register offset/index instruction, set
|
|
// shift_immed(bit[11:7]) and shift(bit[6:5]) fields.
|
|
if (unsigned ShImm = ARM_AM::getAM2Offset(AM2Opc)) {
|
|
Binary |= getShiftOp(AM2Opc) << ARMII::ShiftImmShift; // shift
|
|
Binary |= ShImm << ARMII::ShiftShift; // shift_immed
|
|
}
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitMiscLoadStoreInstruction(const MachineInstr &MI,
|
|
unsigned ImplicitRn) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
unsigned Form = TID.TSFlags & ARMII::FormMask;
|
|
bool IsPrePost = (TID.TSFlags & ARMII::IndexModeMask) != 0;
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
unsigned OpIdx = 0;
|
|
|
|
// Operand 0 of a pre- and post-indexed store is the address base
|
|
// writeback. Skip it.
|
|
bool Skipped = false;
|
|
if (IsPrePost && Form == ARMII::StMiscFrm) {
|
|
++OpIdx;
|
|
Skipped = true;
|
|
}
|
|
|
|
// Set first operand
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
|
|
|
|
// Skip LDRD and STRD's second operand.
|
|
if (TID.Opcode == ARM::LDRD || TID.Opcode == ARM::STRD)
|
|
++OpIdx;
|
|
|
|
// Set second operand
|
|
if (ImplicitRn)
|
|
// Special handling for implicit use (e.g. PC).
|
|
Binary |= (ARMRegisterInfo::getRegisterNumbering(ImplicitRn)
|
|
<< ARMII::RegRnShift);
|
|
else
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRnShift;
|
|
|
|
// If this is a two-address operand, skip it. e.g. LDRH_POST.
|
|
if (!Skipped && TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
|
|
++OpIdx;
|
|
|
|
const MachineOperand &MO2 = MI.getOperand(OpIdx);
|
|
unsigned AM3Opc = (ImplicitRn == ARM::PC)
|
|
? 0 : MI.getOperand(OpIdx+1).getImm();
|
|
|
|
// Set bit U(23) according to sign of immed value (positive or negative)
|
|
Binary |= ((ARM_AM::getAM3Op(AM3Opc) == ARM_AM::add ? 1 : 0) <<
|
|
ARMII::U_BitShift);
|
|
|
|
// If this instr is in register offset/index encoding, set bit[3:0]
|
|
// to the corresponding Rm register.
|
|
if (MO2.getReg()) {
|
|
Binary |= ARMRegisterInfo::getRegisterNumbering(MO2.getReg());
|
|
emitWordLE(Binary);
|
|
return;
|
|
}
|
|
|
|
// This instr is in immediate offset/index encoding, set bit 22 to 1.
|
|
Binary |= 1 << ARMII::AM3_I_BitShift;
|
|
if (unsigned ImmOffs = ARM_AM::getAM3Offset(AM3Opc)) {
|
|
// Set operands
|
|
Binary |= (ImmOffs >> 4) << ARMII::ImmHiShift; // immedH
|
|
Binary |= (ImmOffs & 0xF); // immedL
|
|
}
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
static unsigned getAddrModeUPBits(unsigned Mode) {
|
|
unsigned Binary = 0;
|
|
|
|
// Set addressing mode by modifying bits U(23) and P(24)
|
|
// IA - Increment after - bit U = 1 and bit P = 0
|
|
// IB - Increment before - bit U = 1 and bit P = 1
|
|
// DA - Decrement after - bit U = 0 and bit P = 0
|
|
// DB - Decrement before - bit U = 0 and bit P = 1
|
|
switch (Mode) {
|
|
default: llvm_unreachable("Unknown addressing sub-mode!");
|
|
case ARM_AM::da: break;
|
|
case ARM_AM::db: Binary |= 0x1 << ARMII::P_BitShift; break;
|
|
case ARM_AM::ia: Binary |= 0x1 << ARMII::U_BitShift; break;
|
|
case ARM_AM::ib: Binary |= 0x3 << ARMII::U_BitShift; break;
|
|
}
|
|
|
|
return Binary;
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitLoadStoreMultipleInstruction(
|
|
const MachineInstr &MI) {
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Set base address operand
|
|
Binary |= getMachineOpValue(MI, 0) << ARMII::RegRnShift;
|
|
|
|
// Set addressing mode by modifying bits U(23) and P(24)
|
|
const MachineOperand &MO = MI.getOperand(1);
|
|
Binary |= getAddrModeUPBits(ARM_AM::getAM4SubMode(MO.getImm()));
|
|
|
|
// Set bit W(21)
|
|
if (ARM_AM::getAM4WBFlag(MO.getImm()))
|
|
Binary |= 0x1 << ARMII::W_BitShift;
|
|
|
|
// Set registers
|
|
for (unsigned i = 5, e = MI.getNumOperands(); i != e; ++i) {
|
|
const MachineOperand &MO = MI.getOperand(i);
|
|
if (!MO.isReg() || MO.isImplicit())
|
|
break;
|
|
unsigned RegNum = ARMRegisterInfo::getRegisterNumbering(MO.getReg());
|
|
assert(TargetRegisterInfo::isPhysicalRegister(MO.getReg()) &&
|
|
RegNum < 16);
|
|
Binary |= 0x1 << RegNum;
|
|
}
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitMulFrmInstruction(const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Encode S bit if MI modifies CPSR.
|
|
Binary |= getAddrModeSBit(MI, TID);
|
|
|
|
// 32x32->64bit operations have two destination registers. The number
|
|
// of register definitions will tell us if that's what we're dealing with.
|
|
unsigned OpIdx = 0;
|
|
if (TID.getNumDefs() == 2)
|
|
Binary |= getMachineOpValue (MI, OpIdx++) << ARMII::RegRdLoShift;
|
|
|
|
// Encode Rd
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdHiShift;
|
|
|
|
// Encode Rm
|
|
Binary |= getMachineOpValue(MI, OpIdx++);
|
|
|
|
// Encode Rs
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRsShift;
|
|
|
|
// Many multiple instructions (e.g. MLA) have three src operands. Encode
|
|
// it as Rn (for multiply, that's in the same offset as RdLo.
|
|
if (TID.getNumOperands() > OpIdx &&
|
|
!TID.OpInfo[OpIdx].isPredicate() &&
|
|
!TID.OpInfo[OpIdx].isOptionalDef())
|
|
Binary |= getMachineOpValue(MI, OpIdx) << ARMII::RegRdLoShift;
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitExtendInstruction(const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
unsigned OpIdx = 0;
|
|
|
|
// Encode Rd
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
|
|
|
|
const MachineOperand &MO1 = MI.getOperand(OpIdx++);
|
|
const MachineOperand &MO2 = MI.getOperand(OpIdx);
|
|
if (MO2.isReg()) {
|
|
// Two register operand form.
|
|
// Encode Rn.
|
|
Binary |= getMachineOpValue(MI, MO1) << ARMII::RegRnShift;
|
|
|
|
// Encode Rm.
|
|
Binary |= getMachineOpValue(MI, MO2);
|
|
++OpIdx;
|
|
} else {
|
|
Binary |= getMachineOpValue(MI, MO1);
|
|
}
|
|
|
|
// Encode rot imm (0, 8, 16, or 24) if it has a rotate immediate operand.
|
|
if (MI.getOperand(OpIdx).isImm() &&
|
|
!TID.OpInfo[OpIdx].isPredicate() &&
|
|
!TID.OpInfo[OpIdx].isOptionalDef())
|
|
Binary |= (getMachineOpValue(MI, OpIdx) / 8) << ARMII::ExtRotImmShift;
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitMiscArithInstruction(const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
unsigned OpIdx = 0;
|
|
|
|
// Encode Rd
|
|
Binary |= getMachineOpValue(MI, OpIdx++) << ARMII::RegRdShift;
|
|
|
|
const MachineOperand &MO = MI.getOperand(OpIdx++);
|
|
if (OpIdx == TID.getNumOperands() ||
|
|
TID.OpInfo[OpIdx].isPredicate() ||
|
|
TID.OpInfo[OpIdx].isOptionalDef()) {
|
|
// Encode Rm and it's done.
|
|
Binary |= getMachineOpValue(MI, MO);
|
|
emitWordLE(Binary);
|
|
return;
|
|
}
|
|
|
|
// Encode Rn.
|
|
Binary |= getMachineOpValue(MI, MO) << ARMII::RegRnShift;
|
|
|
|
// Encode Rm.
|
|
Binary |= getMachineOpValue(MI, OpIdx++);
|
|
|
|
// Encode shift_imm.
|
|
unsigned ShiftAmt = MI.getOperand(OpIdx).getImm();
|
|
assert(ShiftAmt < 32 && "shift_imm range is 0 to 31!");
|
|
Binary |= ShiftAmt << ARMII::ShiftShift;
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitBranchInstruction(const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
if (TID.Opcode == ARM::TPsoft) {
|
|
llvm_unreachable("ARM::TPsoft FIXME"); // FIXME
|
|
}
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Set signed_immed_24 field
|
|
Binary |= getMachineOpValue(MI, 0);
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitInlineJumpTable(unsigned JTIndex) {
|
|
// Remember the base address of the inline jump table.
|
|
uintptr_t JTBase = MCE.getCurrentPCValue();
|
|
JTI->addJumpTableBaseAddr(JTIndex, JTBase);
|
|
DEBUG(errs() << " ** Jump Table #" << JTIndex << " @ " << (void*)JTBase
|
|
<< '\n');
|
|
|
|
// Now emit the jump table entries.
|
|
const std::vector<MachineBasicBlock*> &MBBs = (*MJTEs)[JTIndex].MBBs;
|
|
for (unsigned i = 0, e = MBBs.size(); i != e; ++i) {
|
|
if (IsPIC)
|
|
// DestBB address - JT base.
|
|
emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_pic_jt, JTBase);
|
|
else
|
|
// Absolute DestBB address.
|
|
emitMachineBasicBlock(MBBs[i], ARM::reloc_arm_absolute);
|
|
emitWordLE(0);
|
|
}
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitMiscBranchInstruction(const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
// Handle jump tables.
|
|
if (TID.Opcode == ARM::BR_JTr || TID.Opcode == ARM::BR_JTadd) {
|
|
// First emit a ldr pc, [] instruction.
|
|
emitDataProcessingInstruction(MI, ARM::PC);
|
|
|
|
// Then emit the inline jump table.
|
|
unsigned JTIndex =
|
|
(TID.Opcode == ARM::BR_JTr)
|
|
? MI.getOperand(1).getIndex() : MI.getOperand(2).getIndex();
|
|
emitInlineJumpTable(JTIndex);
|
|
return;
|
|
} else if (TID.Opcode == ARM::BR_JTm) {
|
|
// First emit a ldr pc, [] instruction.
|
|
emitLoadStoreInstruction(MI, ARM::PC);
|
|
|
|
// Then emit the inline jump table.
|
|
emitInlineJumpTable(MI.getOperand(3).getIndex());
|
|
return;
|
|
}
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
if (TID.Opcode == ARM::BX_RET)
|
|
// The return register is LR.
|
|
Binary |= ARMRegisterInfo::getRegisterNumbering(ARM::LR);
|
|
else
|
|
// otherwise, set the return register
|
|
Binary |= getMachineOpValue(MI, 0);
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
static unsigned encodeVFPRd(const MachineInstr &MI, unsigned OpIdx) {
|
|
unsigned RegD = MI.getOperand(OpIdx).getReg();
|
|
unsigned Binary = 0;
|
|
bool isSPVFP = false;
|
|
RegD = ARMRegisterInfo::getRegisterNumbering(RegD, &isSPVFP);
|
|
if (!isSPVFP)
|
|
Binary |= RegD << ARMII::RegRdShift;
|
|
else {
|
|
Binary |= ((RegD & 0x1E) >> 1) << ARMII::RegRdShift;
|
|
Binary |= (RegD & 0x01) << ARMII::D_BitShift;
|
|
}
|
|
return Binary;
|
|
}
|
|
|
|
static unsigned encodeVFPRn(const MachineInstr &MI, unsigned OpIdx) {
|
|
unsigned RegN = MI.getOperand(OpIdx).getReg();
|
|
unsigned Binary = 0;
|
|
bool isSPVFP = false;
|
|
RegN = ARMRegisterInfo::getRegisterNumbering(RegN, &isSPVFP);
|
|
if (!isSPVFP)
|
|
Binary |= RegN << ARMII::RegRnShift;
|
|
else {
|
|
Binary |= ((RegN & 0x1E) >> 1) << ARMII::RegRnShift;
|
|
Binary |= (RegN & 0x01) << ARMII::N_BitShift;
|
|
}
|
|
return Binary;
|
|
}
|
|
|
|
static unsigned encodeVFPRm(const MachineInstr &MI, unsigned OpIdx) {
|
|
unsigned RegM = MI.getOperand(OpIdx).getReg();
|
|
unsigned Binary = 0;
|
|
bool isSPVFP = false;
|
|
RegM = ARMRegisterInfo::getRegisterNumbering(RegM, &isSPVFP);
|
|
if (!isSPVFP)
|
|
Binary |= RegM;
|
|
else {
|
|
Binary |= ((RegM & 0x1E) >> 1);
|
|
Binary |= (RegM & 0x01) << ARMII::M_BitShift;
|
|
}
|
|
return Binary;
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitVFPArithInstruction(const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
unsigned OpIdx = 0;
|
|
assert((Binary & ARMII::D_BitShift) == 0 &&
|
|
(Binary & ARMII::N_BitShift) == 0 &&
|
|
(Binary & ARMII::M_BitShift) == 0 && "VFP encoding bug!");
|
|
|
|
// Encode Dd / Sd.
|
|
Binary |= encodeVFPRd(MI, OpIdx++);
|
|
|
|
// If this is a two-address operand, skip it, e.g. FMACD.
|
|
if (TID.getOperandConstraint(OpIdx, TOI::TIED_TO) != -1)
|
|
++OpIdx;
|
|
|
|
// Encode Dn / Sn.
|
|
if ((TID.TSFlags & ARMII::FormMask) == ARMII::VFPBinaryFrm)
|
|
Binary |= encodeVFPRn(MI, OpIdx++);
|
|
|
|
if (OpIdx == TID.getNumOperands() ||
|
|
TID.OpInfo[OpIdx].isPredicate() ||
|
|
TID.OpInfo[OpIdx].isOptionalDef()) {
|
|
// FCMPEZD etc. has only one operand.
|
|
emitWordLE(Binary);
|
|
return;
|
|
}
|
|
|
|
// Encode Dm / Sm.
|
|
Binary |= encodeVFPRm(MI, OpIdx);
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitVFPConversionInstruction(
|
|
const MachineInstr &MI) {
|
|
const TargetInstrDesc &TID = MI.getDesc();
|
|
unsigned Form = TID.TSFlags & ARMII::FormMask;
|
|
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
switch (Form) {
|
|
default: break;
|
|
case ARMII::VFPConv1Frm:
|
|
case ARMII::VFPConv2Frm:
|
|
case ARMII::VFPConv3Frm:
|
|
// Encode Dd / Sd.
|
|
Binary |= encodeVFPRd(MI, 0);
|
|
break;
|
|
case ARMII::VFPConv4Frm:
|
|
// Encode Dn / Sn.
|
|
Binary |= encodeVFPRn(MI, 0);
|
|
break;
|
|
case ARMII::VFPConv5Frm:
|
|
// Encode Dm / Sm.
|
|
Binary |= encodeVFPRm(MI, 0);
|
|
break;
|
|
}
|
|
|
|
switch (Form) {
|
|
default: break;
|
|
case ARMII::VFPConv1Frm:
|
|
// Encode Dm / Sm.
|
|
Binary |= encodeVFPRm(MI, 1);
|
|
break;
|
|
case ARMII::VFPConv2Frm:
|
|
case ARMII::VFPConv3Frm:
|
|
// Encode Dn / Sn.
|
|
Binary |= encodeVFPRn(MI, 1);
|
|
break;
|
|
case ARMII::VFPConv4Frm:
|
|
case ARMII::VFPConv5Frm:
|
|
// Encode Dd / Sd.
|
|
Binary |= encodeVFPRd(MI, 1);
|
|
break;
|
|
}
|
|
|
|
if (Form == ARMII::VFPConv5Frm)
|
|
// Encode Dn / Sn.
|
|
Binary |= encodeVFPRn(MI, 2);
|
|
else if (Form == ARMII::VFPConv3Frm)
|
|
// Encode Dm / Sm.
|
|
Binary |= encodeVFPRm(MI, 2);
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitVFPLoadStoreInstruction(const MachineInstr &MI) {
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
unsigned OpIdx = 0;
|
|
|
|
// Encode Dd / Sd.
|
|
Binary |= encodeVFPRd(MI, OpIdx++);
|
|
|
|
// Encode address base.
|
|
const MachineOperand &Base = MI.getOperand(OpIdx++);
|
|
Binary |= getMachineOpValue(MI, Base) << ARMII::RegRnShift;
|
|
|
|
// If there is a non-zero immediate offset, encode it.
|
|
if (Base.isReg()) {
|
|
const MachineOperand &Offset = MI.getOperand(OpIdx);
|
|
if (unsigned ImmOffs = ARM_AM::getAM5Offset(Offset.getImm())) {
|
|
if (ARM_AM::getAM5Op(Offset.getImm()) == ARM_AM::add)
|
|
Binary |= 1 << ARMII::U_BitShift;
|
|
Binary |= ImmOffs;
|
|
emitWordLE(Binary);
|
|
return;
|
|
}
|
|
}
|
|
|
|
// If immediate offset is omitted, default to +0.
|
|
Binary |= 1 << ARMII::U_BitShift;
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitVFPLoadStoreMultipleInstruction(
|
|
const MachineInstr &MI) {
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
// Set base address operand
|
|
Binary |= getMachineOpValue(MI, 0) << ARMII::RegRnShift;
|
|
|
|
// Set addressing mode by modifying bits U(23) and P(24)
|
|
const MachineOperand &MO = MI.getOperand(1);
|
|
Binary |= getAddrModeUPBits(ARM_AM::getAM5SubMode(MO.getImm()));
|
|
|
|
// Set bit W(21)
|
|
if (ARM_AM::getAM5WBFlag(MO.getImm()))
|
|
Binary |= 0x1 << ARMII::W_BitShift;
|
|
|
|
// First register is encoded in Dd.
|
|
Binary |= encodeVFPRd(MI, 5);
|
|
|
|
// Number of registers are encoded in offset field.
|
|
unsigned NumRegs = 1;
|
|
for (unsigned i = 6, e = MI.getNumOperands(); i != e; ++i) {
|
|
const MachineOperand &MO = MI.getOperand(i);
|
|
if (!MO.isReg() || MO.isImplicit())
|
|
break;
|
|
++NumRegs;
|
|
}
|
|
Binary |= NumRegs * 2;
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
template<class CodeEmitter>
|
|
void Emitter<CodeEmitter>::emitMiscInstruction(const MachineInstr &MI) {
|
|
// Part of binary is determined by TableGn.
|
|
unsigned Binary = getBinaryCodeForInstr(MI);
|
|
|
|
// Set the conditional execution predicate
|
|
Binary |= II->getPredicate(&MI) << ARMII::CondShift;
|
|
|
|
emitWordLE(Binary);
|
|
}
|
|
|
|
#include "ARMGenCodeEmitter.inc"
|