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booleans. This gives a better indication of what the "addReg()" is doing. Remembering what all of those booleans mean isn't easy, especially if you aren't spending all of your time in that code. I took Jakob's suggestion and made it illegal to pass in "true" for the flag. This should hopefully prevent any unintended misuse of this (by reverting to the old way of using addReg()). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@71722 91177308-0d34-0410-b5e6-96231b3b80d8
178 lines
6.0 KiB
C++
178 lines
6.0 KiB
C++
//===- MSP430InstrInfo.cpp - MSP430 Instruction Information ---------------===//
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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 MSP430 implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "MSP430.h"
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#include "MSP430InstrInfo.h"
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#include "MSP430MachineFunctionInfo.h"
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#include "MSP430TargetMachine.h"
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#include "MSP430GenInstrInfo.inc"
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#include "llvm/Function.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/MachineRegisterInfo.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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using namespace llvm;
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MSP430InstrInfo::MSP430InstrInfo(MSP430TargetMachine &tm)
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: TargetInstrInfoImpl(MSP430Insts, array_lengthof(MSP430Insts)),
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RI(tm, *this), TM(tm) {}
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void MSP430InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned SrcReg, bool isKill, int FrameIdx,
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const TargetRegisterClass *RC) const {
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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if (RC == &MSP430::GR16RegClass)
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BuildMI(MBB, MI, DL, get(MSP430::MOV16mr))
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.addFrameIndex(FrameIdx).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill));
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else if (RC == &MSP430::GR8RegClass)
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BuildMI(MBB, MI, DL, get(MSP430::MOV8mr))
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.addFrameIndex(FrameIdx).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill));
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else
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assert(0 && "Cannot store this register to stack slot!");
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}
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void MSP430InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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unsigned DestReg, int FrameIdx,
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const TargetRegisterClass *RC) const{
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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if (RC == &MSP430::GR16RegClass)
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BuildMI(MBB, MI, DL, get(MSP430::MOV16rm))
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.addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
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else if (RC == &MSP430::GR8RegClass)
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BuildMI(MBB, MI, DL, get(MSP430::MOV8rm))
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.addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
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else
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assert(0 && "Cannot store this register to stack slot!");
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}
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bool MSP430InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I,
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unsigned DestReg, unsigned SrcReg,
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const TargetRegisterClass *DestRC,
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const TargetRegisterClass *SrcRC) const {
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (I != MBB.end()) DL = I->getDebugLoc();
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if (DestRC == SrcRC) {
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unsigned Opc;
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if (DestRC == &MSP430::GR16RegClass) {
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Opc = MSP430::MOV16rr;
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} else if (DestRC == &MSP430::GR8RegClass) {
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Opc = MSP430::MOV8rr;
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} else {
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return false;
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}
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BuildMI(MBB, I, DL, get(Opc), DestReg).addReg(SrcReg);
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return true;
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}
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return false;
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}
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bool
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MSP430InstrInfo::isMoveInstr(const MachineInstr& MI,
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unsigned &SrcReg, unsigned &DstReg,
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unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
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SrcSubIdx = DstSubIdx = 0; // No sub-registers yet.
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switch (MI.getOpcode()) {
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default:
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return false;
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case MSP430::MOV8rr:
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case MSP430::MOV16rr:
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assert(MI.getNumOperands() >= 2 &&
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MI.getOperand(0).isReg() &&
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MI.getOperand(1).isReg() &&
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"invalid register-register move instruction");
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SrcReg = MI.getOperand(1).getReg();
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DstReg = MI.getOperand(0).getReg();
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return true;
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}
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}
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bool
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MSP430InstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI) const {
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if (CSI.empty())
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return false;
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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MachineFunction &MF = *MBB.getParent();
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MSP430MachineFunctionInfo *MFI = MF.getInfo<MSP430MachineFunctionInfo>();
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MFI->setCalleeSavedFrameSize(CSI.size() * 2);
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for (unsigned i = CSI.size(); i != 0; --i) {
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unsigned Reg = CSI[i-1].getReg();
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// Add the callee-saved register as live-in. It's killed at the spill.
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MBB.addLiveIn(Reg);
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BuildMI(MBB, MI, DL, get(MSP430::PUSH16r))
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.addReg(Reg, RegState::Kill);
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}
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return true;
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}
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bool
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MSP430InstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI,
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const std::vector<CalleeSavedInfo> &CSI) const {
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if (CSI.empty())
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return false;
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DebugLoc DL = DebugLoc::getUnknownLoc();
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if (MI != MBB.end()) DL = MI->getDebugLoc();
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for (unsigned i = 0, e = CSI.size(); i != e; ++i)
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BuildMI(MBB, MI, DL, get(MSP430::POP16r), CSI[i].getReg());
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return true;
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}
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unsigned
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MSP430InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
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MachineBasicBlock *FBB,
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const SmallVectorImpl<MachineOperand> &Cond) const {
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// FIXME this should probably have a DebugLoc operand
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DebugLoc dl = DebugLoc::getUnknownLoc();
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// Shouldn't be a fall through.
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assert(TBB && "InsertBranch must not be told to insert a fallthrough");
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assert((Cond.size() == 1 || Cond.size() == 0) &&
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"MSP430 branch conditions have one component!");
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if (Cond.empty()) {
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// Unconditional branch?
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assert(!FBB && "Unconditional branch with multiple successors!");
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BuildMI(&MBB, dl, get(MSP430::JMP)).addMBB(TBB);
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return 1;
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}
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// Conditional branch.
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unsigned Count = 0;
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assert(0 && "Implement conditional branches!");
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return Count;
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}
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