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//===- MSP430InstrInfo.cpp - MSP430 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 MSP430 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "MSP430.h"
#include "MSP430InstrInfo.h"
#include "MSP430MachineFunctionInfo.h"
#include "MSP430TargetMachine.h"
#include "MSP430GenInstrInfo.inc"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
MSP430InstrInfo::MSP430InstrInfo(MSP430TargetMachine &tm)
: TargetInstrInfoImpl(MSP430Insts, array_lengthof(MSP430Insts)),
RI(tm, *this), TM(tm) {}
void MSP430InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIdx,
const TargetRegisterClass *RC) const {
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
if (RC == &MSP430::GR16RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV16mr))
.addFrameIndex(FrameIdx).addImm(0)
.addReg(SrcReg, getKillRegState(isKill));
else if (RC == &MSP430::GR8RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV8mr))
.addFrameIndex(FrameIdx).addImm(0)
.addReg(SrcReg, getKillRegState(isKill));
else
llvm_unreachable("Cannot store this register to stack slot!");
}
void MSP430InstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned DestReg, int FrameIdx,
const TargetRegisterClass *RC) const{
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
if (RC == &MSP430::GR16RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV16rm))
.addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
else if (RC == &MSP430::GR8RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV8rm))
.addReg(DestReg).addFrameIndex(FrameIdx).addImm(0);
else
llvm_unreachable("Cannot store this register to stack slot!");
}
bool MSP430InstrInfo::copyRegToReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
unsigned DestReg, unsigned SrcReg,
const TargetRegisterClass *DestRC,
const TargetRegisterClass *SrcRC) const {
DebugLoc DL = DebugLoc::getUnknownLoc();
if (I != MBB.end()) DL = I->getDebugLoc();
if (DestRC == SrcRC) {
unsigned Opc;
if (DestRC == &MSP430::GR16RegClass) {
Opc = MSP430::MOV16rr;
} else if (DestRC == &MSP430::GR8RegClass) {
Opc = MSP430::MOV8rr;
} else {
return false;
}
BuildMI(MBB, I, DL, get(Opc), DestReg).addReg(SrcReg);
return true;
}
return false;
}
bool
MSP430InstrInfo::isMoveInstr(const MachineInstr& MI,
unsigned &SrcReg, unsigned &DstReg,
unsigned &SrcSubIdx, unsigned &DstSubIdx) const {
SrcSubIdx = DstSubIdx = 0; // No sub-registers yet.
switch (MI.getOpcode()) {
default:
return false;
case MSP430::MOV8rr:
case MSP430::MOV16rr:
assert(MI.getNumOperands() >= 2 &&
MI.getOperand(0).isReg() &&
MI.getOperand(1).isReg() &&
"invalid register-register move instruction");
SrcReg = MI.getOperand(1).getReg();
DstReg = MI.getOperand(0).getReg();
return true;
}
}
bool
MSP430InstrInfo::spillCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI) const {
if (CSI.empty())
return false;
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
MSP430MachineFunctionInfo *MFI = MF.getInfo<MSP430MachineFunctionInfo>();
MFI->setCalleeSavedFrameSize(CSI.size() * 2);
for (unsigned i = CSI.size(); i != 0; --i) {
unsigned Reg = CSI[i-1].getReg();
// Add the callee-saved register as live-in. It's killed at the spill.
MBB.addLiveIn(Reg);
BuildMI(MBB, MI, DL, get(MSP430::PUSH16r))
.addReg(Reg, RegState::Kill);
}
return true;
}
bool
MSP430InstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
const std::vector<CalleeSavedInfo> &CSI) const {
if (CSI.empty())
return false;
DebugLoc DL = DebugLoc::getUnknownLoc();
if (MI != MBB.end()) DL = MI->getDebugLoc();
for (unsigned i = 0, e = CSI.size(); i != e; ++i)
BuildMI(MBB, MI, DL, get(MSP430::POP16r), CSI[i].getReg());
return true;
}
unsigned
MSP430InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
const SmallVectorImpl<MachineOperand> &Cond) const {
// FIXME this should probably have a DebugLoc operand
DebugLoc dl = DebugLoc::getUnknownLoc();
// Shouldn't be a fall through.
assert(TBB && "InsertBranch must not be told to insert a fallthrough");
assert((Cond.size() == 1 || Cond.size() == 0) &&
"MSP430 branch conditions have one component!");
if (Cond.empty()) {
// Unconditional branch?
assert(!FBB && "Unconditional branch with multiple successors!");
BuildMI(&MBB, dl, get(MSP430::JMP)).addMBB(TBB);
return 1;
}
// Conditional branch.
unsigned Count = 0;
llvm_unreachable("Implement conditional branches!");
return Count;
}
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