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81bbef609c
In many places in the backend, we like to know whether we're optimising for code size and this is performed by checking the current machine function attributes. A subtarget is created on a per-function basis, so it's possible to know when we're compiling for code size on construction so record this in the new object. Differential Revision: https://reviews.llvm.org/D57812 llvm-svn: 353501
137 lines
4.2 KiB
C++
137 lines
4.2 KiB
C++
//===-- ARMInstrInfo.cpp - ARM Instruction Information --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the ARM implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMInstrInfo.h"
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#include "ARM.h"
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#include "ARMConstantPoolValue.h"
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#include "ARMMachineFunctionInfo.h"
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#include "ARMTargetMachine.h"
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#include "MCTargetDesc/ARMAddressingModes.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/CodeGen/LiveVariables.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineJumpTableInfo.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInst.h"
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using namespace llvm;
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ARMInstrInfo::ARMInstrInfo(const ARMSubtarget &STI)
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: ARMBaseInstrInfo(STI), RI() {}
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/// Return the noop instruction to use for a noop.
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void ARMInstrInfo::getNoop(MCInst &NopInst) const {
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if (hasNOP()) {
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NopInst.setOpcode(ARM::HINT);
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NopInst.addOperand(MCOperand::createImm(0));
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NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
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NopInst.addOperand(MCOperand::createReg(0));
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} else {
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NopInst.setOpcode(ARM::MOVr);
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NopInst.addOperand(MCOperand::createReg(ARM::R0));
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NopInst.addOperand(MCOperand::createReg(ARM::R0));
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NopInst.addOperand(MCOperand::createImm(ARMCC::AL));
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NopInst.addOperand(MCOperand::createReg(0));
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NopInst.addOperand(MCOperand::createReg(0));
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}
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}
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unsigned ARMInstrInfo::getUnindexedOpcode(unsigned Opc) const {
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switch (Opc) {
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default:
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break;
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case ARM::LDR_PRE_IMM:
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case ARM::LDR_PRE_REG:
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case ARM::LDR_POST_IMM:
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case ARM::LDR_POST_REG:
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return ARM::LDRi12;
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case ARM::LDRH_PRE:
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case ARM::LDRH_POST:
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return ARM::LDRH;
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case ARM::LDRB_PRE_IMM:
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case ARM::LDRB_PRE_REG:
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case ARM::LDRB_POST_IMM:
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case ARM::LDRB_POST_REG:
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return ARM::LDRBi12;
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case ARM::LDRSH_PRE:
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case ARM::LDRSH_POST:
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return ARM::LDRSH;
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case ARM::LDRSB_PRE:
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case ARM::LDRSB_POST:
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return ARM::LDRSB;
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case ARM::STR_PRE_IMM:
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case ARM::STR_PRE_REG:
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case ARM::STR_POST_IMM:
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case ARM::STR_POST_REG:
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return ARM::STRi12;
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case ARM::STRH_PRE:
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case ARM::STRH_POST:
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return ARM::STRH;
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case ARM::STRB_PRE_IMM:
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case ARM::STRB_PRE_REG:
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case ARM::STRB_POST_IMM:
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case ARM::STRB_POST_REG:
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return ARM::STRBi12;
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}
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return 0;
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}
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void ARMInstrInfo::expandLoadStackGuard(MachineBasicBlock::iterator MI) const {
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MachineFunction &MF = *MI->getParent()->getParent();
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const ARMSubtarget &Subtarget = MF.getSubtarget<ARMSubtarget>();
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const TargetMachine &TM = MF.getTarget();
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if (!Subtarget.useMovt()) {
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if (TM.isPositionIndependent())
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expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_pcrel, ARM::LDRi12);
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else
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expandLoadStackGuardBase(MI, ARM::LDRLIT_ga_abs, ARM::LDRi12);
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return;
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}
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if (!TM.isPositionIndependent()) {
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expandLoadStackGuardBase(MI, ARM::MOVi32imm, ARM::LDRi12);
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return;
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}
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const GlobalValue *GV =
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cast<GlobalValue>((*MI->memoperands_begin())->getValue());
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if (!Subtarget.isGVIndirectSymbol(GV)) {
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expandLoadStackGuardBase(MI, ARM::MOV_ga_pcrel, ARM::LDRi12);
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return;
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}
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MachineBasicBlock &MBB = *MI->getParent();
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DebugLoc DL = MI->getDebugLoc();
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unsigned Reg = MI->getOperand(0).getReg();
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MachineInstrBuilder MIB;
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MIB = BuildMI(MBB, MI, DL, get(ARM::MOV_ga_pcrel_ldr), Reg)
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.addGlobalAddress(GV, 0, ARMII::MO_NONLAZY);
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auto Flags = MachineMemOperand::MOLoad |
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MachineMemOperand::MODereferenceable |
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MachineMemOperand::MOInvariant;
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MachineMemOperand *MMO = MBB.getParent()->getMachineMemOperand(
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MachinePointerInfo::getGOT(*MBB.getParent()), Flags, 4, 4);
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MIB.addMemOperand(MMO);
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BuildMI(MBB, MI, DL, get(ARM::LDRi12), Reg)
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.addReg(Reg, RegState::Kill)
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.addImm(0)
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.cloneMemRefs(*MI)
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.add(predOps(ARMCC::AL));
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}
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