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llvm-project/llvm/lib/Target/MSP430/MSP430InstrInfo.cpp

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//===-- MSP430InstrInfo.cpp - MSP430 Instruction Information --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the MSP430 implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "MSP430InstrInfo.h"
#include "MSP430.h"
#include "MSP430MachineFunctionInfo.h"
#include "MSP430TargetMachine.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
#define GET_INSTRINFO_CTOR_DTOR
#include "MSP430GenInstrInfo.inc"
// Pin the vtable to this file.
void MSP430InstrInfo::anchor() {}
MSP430InstrInfo::MSP430InstrInfo(MSP430Subtarget &STI)
: MSP430GenInstrInfo(MSP430::ADJCALLSTACKDOWN, MSP430::ADJCALLSTACKUP),
RI() {}
void MSP430InstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MI,
unsigned SrcReg, bool isKill, int FrameIdx,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
DebugLoc DL;
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
MachineFrameInfo &MFI = MF.getFrameInfo();
MachineMemOperand *MMO = MF.getMachineMemOperand(
MachinePointerInfo::getFixedStack(MF, FrameIdx),
MachineMemOperand::MOStore, MFI.getObjectSize(FrameIdx),
MFI.getObjectAlignment(FrameIdx));
if (RC == &MSP430::GR16RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV16mr))
.addFrameIndex(FrameIdx).addImm(0)
.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
else if (RC == &MSP430::GR8RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV8mr))
.addFrameIndex(FrameIdx).addImm(0)
.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
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 TargetRegisterInfo *TRI) const{
DebugLoc DL;
if (MI != MBB.end()) DL = MI->getDebugLoc();
MachineFunction &MF = *MBB.getParent();
MachineFrameInfo &MFI = MF.getFrameInfo();
MachineMemOperand *MMO = MF.getMachineMemOperand(
MachinePointerInfo::getFixedStack(MF, FrameIdx),
MachineMemOperand::MOLoad, MFI.getObjectSize(FrameIdx),
MFI.getObjectAlignment(FrameIdx));
if (RC == &MSP430::GR16RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV16rm))
.addReg(DestReg, getDefRegState(true)).addFrameIndex(FrameIdx)
.addImm(0).addMemOperand(MMO);
else if (RC == &MSP430::GR8RegClass)
BuildMI(MBB, MI, DL, get(MSP430::MOV8rm))
.addReg(DestReg, getDefRegState(true)).addFrameIndex(FrameIdx)
.addImm(0).addMemOperand(MMO);
else
llvm_unreachable("Cannot store this register to stack slot!");
}
void MSP430InstrInfo::copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
const DebugLoc &DL, MCRegister DestReg,
MCRegister SrcReg, bool KillSrc) const {
unsigned Opc;
if (MSP430::GR16RegClass.contains(DestReg, SrcReg))
Opc = MSP430::MOV16rr;
else if (MSP430::GR8RegClass.contains(DestReg, SrcReg))
Opc = MSP430::MOV8rr;
else
llvm_unreachable("Impossible reg-to-reg copy");
BuildMI(MBB, I, DL, get(Opc), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc));
}
unsigned MSP430InstrInfo::removeBranch(MachineBasicBlock &MBB,
int *BytesRemoved) const {
assert(!BytesRemoved && "code size not handled");
MachineBasicBlock::iterator I = MBB.end();
unsigned Count = 0;
while (I != MBB.begin()) {
--I;
if (I->isDebugInstr())
continue;
if (I->getOpcode() != MSP430::JMP &&
I->getOpcode() != MSP430::JCC &&
I->getOpcode() != MSP430::Br &&
I->getOpcode() != MSP430::Bm)
break;
// Remove the branch.
I->eraseFromParent();
I = MBB.end();
++Count;
}
return Count;
}
bool MSP430InstrInfo::
reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
assert(Cond.size() == 1 && "Invalid Xbranch condition!");
MSP430CC::CondCodes CC = static_cast<MSP430CC::CondCodes>(Cond[0].getImm());
switch (CC) {
default: llvm_unreachable("Invalid branch condition!");
case MSP430CC::COND_E:
CC = MSP430CC::COND_NE;
break;
case MSP430CC::COND_NE:
CC = MSP430CC::COND_E;
break;
case MSP430CC::COND_L:
CC = MSP430CC::COND_GE;
break;
case MSP430CC::COND_GE:
CC = MSP430CC::COND_L;
break;
case MSP430CC::COND_HS:
CC = MSP430CC::COND_LO;
break;
case MSP430CC::COND_LO:
CC = MSP430CC::COND_HS;
break;
}
Cond[0].setImm(CC);
return false;
}
bool MSP430InstrInfo::isUnpredicatedTerminator(const MachineInstr &MI) const {
if (!MI.isTerminator())
return false;
// Conditional branch is a special case.
if (MI.isBranch() && !MI.isBarrier())
return true;
if (!MI.isPredicable())
return true;
return !isPredicated(MI);
}
bool MSP430InstrInfo::analyzeBranch(MachineBasicBlock &MBB,
MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const {
// Start from the bottom of the block and work up, examining the
// terminator instructions.
MachineBasicBlock::iterator I = MBB.end();
while (I != MBB.begin()) {
--I;
if (I->isDebugInstr())
continue;
// Working from the bottom, when we see a non-terminator
// instruction, we're done.
if (!isUnpredicatedTerminator(*I))
break;
// A terminator that isn't a branch can't easily be handled
// by this analysis.
if (!I->isBranch())
return true;
// Cannot handle indirect branches.
if (I->getOpcode() == MSP430::Br ||
I->getOpcode() == MSP430::Bm)
return true;
// Handle unconditional branches.
if (I->getOpcode() == MSP430::JMP) {
if (!AllowModify) {
TBB = I->getOperand(0).getMBB();
continue;
}
// If the block has any instructions after a JMP, delete them.
while (std::next(I) != MBB.end())
std::next(I)->eraseFromParent();
Cond.clear();
FBB = nullptr;
// Delete the JMP if it's equivalent to a fall-through.
if (MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
TBB = nullptr;
I->eraseFromParent();
I = MBB.end();
continue;
}
// TBB is used to indicate the unconditinal destination.
TBB = I->getOperand(0).getMBB();
continue;
}
// Handle conditional branches.
assert(I->getOpcode() == MSP430::JCC && "Invalid conditional branch");
MSP430CC::CondCodes BranchCode =
static_cast<MSP430CC::CondCodes>(I->getOperand(1).getImm());
if (BranchCode == MSP430CC::COND_INVALID)
return true; // Can't handle weird stuff.
// Working from the bottom, handle the first conditional branch.
if (Cond.empty()) {
FBB = TBB;
TBB = I->getOperand(0).getMBB();
Cond.push_back(MachineOperand::CreateImm(BranchCode));
continue;
}
// Handle subsequent conditional branches. Only handle the case where all
// conditional branches branch to the same destination.
assert(Cond.size() == 1);
assert(TBB);
// Only handle the case where all conditional branches branch to
// the same destination.
if (TBB != I->getOperand(0).getMBB())
return true;
MSP430CC::CondCodes OldBranchCode = (MSP430CC::CondCodes)Cond[0].getImm();
// If the conditions are the same, we can leave them alone.
if (OldBranchCode == BranchCode)
continue;
return true;
}
return false;
}
unsigned MSP430InstrInfo::insertBranch(MachineBasicBlock &MBB,
MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
ArrayRef<MachineOperand> Cond,
const DebugLoc &DL,
int *BytesAdded) const {
// 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!");
assert(!BytesAdded && "code size not handled");
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;
BuildMI(&MBB, DL, get(MSP430::JCC)).addMBB(TBB).addImm(Cond[0].getImm());
++Count;
if (FBB) {
// Two-way Conditional branch. Insert the second branch.
BuildMI(&MBB, DL, get(MSP430::JMP)).addMBB(FBB);
++Count;
}
return Count;
}
/// GetInstSize - Return the number of bytes of code the specified
/// instruction may be. This returns the maximum number of bytes.
///
unsigned MSP430InstrInfo::getInstSizeInBytes(const MachineInstr &MI) const {
const MCInstrDesc &Desc = MI.getDesc();
switch (Desc.getOpcode()) {
case TargetOpcode::CFI_INSTRUCTION:
case TargetOpcode::EH_LABEL:
case TargetOpcode::IMPLICIT_DEF:
case TargetOpcode::KILL:
case TargetOpcode::DBG_VALUE:
return 0;
case TargetOpcode::INLINEASM:
case TargetOpcode::INLINEASM_BR: {
const MachineFunction *MF = MI.getParent()->getParent();
const TargetInstrInfo &TII = *MF->getSubtarget().getInstrInfo();
return TII.getInlineAsmLength(MI.getOperand(0).getSymbolName(),
*MF->getTarget().getMCAsmInfo());
}
}
return Desc.getSize();
}
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