-//===- ARMInstrInfo.cpp - ARM Instruction Information -----------*- C++ -*-===//
+//===-- ARMInstrInfo.cpp - ARM Instruction Information --------------------===//
//
// The LLVM Compiler Infrastructure
//
#include "ARMInstrInfo.h"
#include "ARM.h"
-#include "ARMAddressingModes.h"
-#include "ARMGenInstrInfo.inc"
+#include "ARMConstantPoolValue.h"
#include "ARMMachineFunctionInfo.h"
+#include "ARMTargetMachine.h"
+#include "MCTargetDesc/ARMAddressingModes.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/GlobalVariable.h"
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCInst.h"
using namespace llvm;
ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
- : ARMBaseInstrInfo(STI), RI(*this, STI) {
+ : ARMBaseInstrInfo(STI), RI() {}
+
+/// getNoopForMachoTarget - Return the noop instruction to use for a noop.
+void ARMInstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
+ if (hasNOP()) {
+ NopInst.setOpcode(ARM::HINT);
+ NopInst.addOperand(MCOperand::createImm(0));
+ NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
+ NopInst.addOperand(MCOperand::createReg(0));
+ } else {
+ NopInst.setOpcode(ARM::MOVr);
+ NopInst.addOperand(MCOperand::createReg(ARM::R0));
+ NopInst.addOperand(MCOperand::createReg(ARM::R0));
+ NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
+ NopInst.addOperand(MCOperand::createReg(0));
+ NopInst.addOperand(MCOperand::createReg(0));
+ }
}
unsigned ARMInstrInfo::getUnindexedOpcode(unsigned Opc) const {
switch (Opc) {
- default: break;
- case ARM::LDR_PRE:
- case ARM::LDR_POST:
- return ARM::LDR;
+ default:
+ break;
+ case ARM::LDR_PRE_IMM:
+ case ARM::LDR_PRE_REG:
+ case ARM::LDR_POST_IMM:
+ case ARM::LDR_POST_REG:
+ return ARM::LDRi12;
case ARM::LDRH_PRE:
case ARM::LDRH_POST:
return ARM::LDRH;
- case ARM::LDRB_PRE:
- case ARM::LDRB_POST:
- return ARM::LDRB;
+ case ARM::LDRB_PRE_IMM:
+ case ARM::LDRB_PRE_REG:
+ case ARM::LDRB_POST_IMM:
+ case ARM::LDRB_POST_REG:
+ return ARM::LDRBi12;
case ARM::LDRSH_PRE:
case ARM::LDRSH_POST:
return ARM::LDRSH;
case ARM::LDRSB_PRE:
case ARM::LDRSB_POST:
return ARM::LDRSB;
- case ARM::STR_PRE:
- case ARM::STR_POST:
- return ARM::STR;
+ case ARM::STR_PRE_IMM:
+ case ARM::STR_PRE_REG:
+ case ARM::STR_POST_IMM:
+ case ARM::STR_POST_REG:
+ return ARM::STRi12;
case ARM::STRH_PRE:
case ARM::STRH_POST:
return ARM::STRH;
- case ARM::STRB_PRE:
- case ARM::STRB_POST:
- return ARM::STRB;
+ case ARM::STRB_PRE_IMM:
+ case ARM::STRB_PRE_REG:
+ case ARM::STRB_POST_IMM:
+ case ARM::STRB_POST_REG:
+ return ARM::STRBi12;
}
return 0;
}
-bool ARMInstrInfo::BlockHasNoFallThrough(const MachineBasicBlock &MBB) const {
- if (MBB.empty()) return false;
-
- switch (MBB.back().getOpcode()) {
- case ARM::BX_RET: // Return.
- case ARM::LDM_RET:
- case ARM::B:
- case ARM::BRIND:
- case ARM::BR_JTr: // Jumptable branch.
- case ARM::BR_JTm: // Jumptable branch through mem.
- case ARM::BR_JTadd: // Jumptable branch add to pc.
- return true;
- default:
- break;
+void ARMInstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI,
+ Reloc::Model RM) const {
+ MachineFunction &MF = *MI->getParent()->getParent();
+ const ARMSubtarget &Subtarget = MF.getSubtarget<ARMSubtarget>();
+
+ if (!Subtarget.useMovt(MF)) {
+ if (RM == Reloc::PIC_)
+ expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_pcrel, ARM::LDRi12, RM);
+ else
+ expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_abs, ARM::LDRi12, RM);
+ return;
}
- return false;
-}
+ if (RM != Reloc::PIC_) {
+ expandLoadStackGuardBase(MI, ARM::MOVi32imm, ARM::LDRi12, RM);
+ return;
+ }
-void ARMInstrInfo::
-reMaterialize(MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I,
- unsigned DestReg, unsigned SubIdx,
- const MachineInstr *Orig) const {
- DebugLoc dl = Orig->getDebugLoc();
- if (Orig->getOpcode() == ARM::MOVi2pieces) {
- RI.emitLoadConstPool(MBB, I, dl,
- DestReg, SubIdx,
- Orig->getOperand(1).getImm(),
- (ARMCC::CondCodes)Orig->getOperand(2).getImm(),
- Orig->getOperand(3).getReg());
+ const GlobalValue *GV =
+ cast<GlobalValue>((*MI->memoperands_begin())->getValue());
+
+ if (!Subtarget.GVIsIndirectSymbol(GV, RM)) {
+ expandLoadStackGuardBase(MI, ARM::MOV_ga_pcrel, ARM::LDRi12, RM);
return;
}
- MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
- MI->getOperand(0).setReg(DestReg);
- MBB.insert(I, MI);
+ MachineBasicBlock &MBB = *MI->getParent();
+ DebugLoc DL = MI->getDebugLoc();
+ unsigned Reg = MI->getOperand(0).getReg();
+ MachineInstrBuilder MIB;
+
+ MIB = BuildMI(MBB, MI, DL, get(ARM::MOV_ga_pcrel_ldr), Reg)
+ .addGlobalAddress(GV, 0, ARMII::MO_NONLAZY);
+ unsigned Flag = MachineMemOperand::MOLoad | MachineMemOperand::MOInvariant;
+ MachineMemOperand *MMO = MBB.getParent()->getMachineMemOperand(
+ MachinePointerInfo::getGOT(*MBB.getParent()), Flag, 4, 4);
+ MIB.addMemOperand(MMO);
+ MIB = BuildMI(MBB, MI, DL, get(ARM::LDRi12), Reg);
+ MIB.addReg(Reg, RegState::Kill).addImm(0);
+ MIB.setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
+ AddDefaultPred(MIB);
+}
+
+namespace {
+/// ARMCGBR - Create Global Base Reg pass. This initializes the PIC
+/// global base register for ARM ELF.
+struct ARMCGBR : public MachineFunctionPass {
+ static char ID;
+ ARMCGBR() : MachineFunctionPass(ID) {}
+
+ bool runOnMachineFunction(MachineFunction &MF) override {
+ ARMFunctionInfo *AFI = MF.getInfo<ARMFunctionInfo>();
+ if (AFI->getGlobalBaseReg() == 0)
+ return false;
+ const ARMSubtarget &STI =
+ static_cast<const ARMSubtarget &>(MF.getSubtarget());
+ // Don't do this for Thumb1.
+ if (STI.isThumb1Only())
+ return false;
+
+ const TargetMachine &TM = MF.getTarget();
+ if (TM.getRelocationModel() != Reloc::PIC_)
+ return false;
+
+ LLVMContext *Context = &MF.getFunction()->getContext();
+ unsigned ARMPCLabelIndex = AFI->createPICLabelUId();
+ unsigned PCAdj = STI.isThumb() ? 4 : 8;
+ ARMConstantPoolValue *CPV = ARMConstantPoolSymbol::Create(
+ *Context, "_GLOBAL_OFFSET_TABLE_", ARMPCLabelIndex, PCAdj);
+
+ unsigned Align =
+ MF.getDataLayout().getPrefTypeAlignment(Type::getInt32PtrTy(*Context));
+ unsigned Idx = MF.getConstantPool()->getConstantPoolIndex(CPV, Align);
+
+ MachineBasicBlock &FirstMBB = MF.front();
+ MachineBasicBlock::iterator MBBI = FirstMBB.begin();
+ DebugLoc DL = FirstMBB.findDebugLoc(MBBI);
+ unsigned TempReg =
+ MF.getRegInfo().createVirtualRegister(&ARM::rGPRRegClass);
+ unsigned Opc = STI.isThumb2() ? ARM::t2LDRpci : ARM::LDRcp;
+ const TargetInstrInfo &TII = *STI.getInstrInfo();
+ MachineInstrBuilder MIB = BuildMI(FirstMBB, MBBI, DL, TII.get(Opc), TempReg)
+ .addConstantPoolIndex(Idx);
+ if (Opc == ARM::LDRcp)
+ MIB.addImm(0);
+ AddDefaultPred(MIB);
+
+ // Fix the GOT address by adding pc.
+ unsigned GlobalBaseReg = AFI->getGlobalBaseReg();
+ Opc = STI.isThumb2() ? ARM::tPICADD : ARM::PICADD;
+ MIB = BuildMI(FirstMBB, MBBI, DL, TII.get(Opc), GlobalBaseReg)
+ .addReg(TempReg)
+ .addImm(ARMPCLabelIndex);
+ if (Opc == ARM::PICADD)
+ AddDefaultPred(MIB);
+
+ return true;
+ }
+
+ const char *getPassName() const override {
+ return "ARM PIC Global Base Reg Initialization";
+ }
+
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
+ AU.setPreservesCFG();
+ MachineFunctionPass::getAnalysisUsage(AU);
+ }
+};
}
+char ARMCGBR::ID = 0;
+FunctionPass *llvm::createARMGlobalBaseRegPass() { return new ARMCGBR(); }
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