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Diffstat (limited to 'contrib/llvm/lib/Target/ARM/ARMInstrInfo.cpp')
| -rw-r--r-- | contrib/llvm/lib/Target/ARM/ARMInstrInfo.cpp | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/contrib/llvm/lib/Target/ARM/ARMInstrInfo.cpp b/contrib/llvm/lib/Target/ARM/ARMInstrInfo.cpp new file mode 100644 index 000000000000..59e1535a6fe6 --- /dev/null +++ b/contrib/llvm/lib/Target/ARM/ARMInstrInfo.cpp @@ -0,0 +1,205 @@ +//===-- ARMInstrInfo.cpp - ARM Instruction Information --------------------===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file contains the ARM implementation of the TargetInstrInfo class. +// +//===----------------------------------------------------------------------===// + +#include "ARMInstrInfo.h" +#include "ARM.h" +#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() {} + +/// 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_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_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_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_IMM: + case ARM::STRB_PRE_REG: + case ARM::STRB_POST_IMM: + case ARM::STRB_POST_REG: + return ARM::STRBi12; + } + + return 0; +} + +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; + } + + if (RM != Reloc::PIC_) { + expandLoadStackGuardBase(MI, ARM::MOVi32imm, ARM::LDRi12, RM); + return; + } + + const GlobalValue *GV = + cast<GlobalValue>((*MI->memoperands_begin())->getValue()); + + if (!Subtarget.GVIsIndirectSymbol(GV, RM)) { + expandLoadStackGuardBase(MI, ARM::MOV_ga_pcrel, ARM::LDRi12, RM); + return; + } + + 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(), 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 = TM.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); + } + }; +} // namespace + +char ARMCGBR::ID = 0; +FunctionPass* +llvm::createARMGlobalBaseRegPass() { return new ARMCGBR(); } |