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//===-- lib/CodeGen/MachineInstrBundle.cpp --------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/MachineInstrBundle.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetRegisterInfo.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallVector.h"
using namespace llvm;
namespace {
class UnpackMachineBundles : public MachineFunctionPass {
public:
static char ID; // Pass identification
UnpackMachineBundles() : MachineFunctionPass(ID) {
initializeUnpackMachineBundlesPass(*PassRegistry::getPassRegistry());
}
virtual bool runOnMachineFunction(MachineFunction &MF);
};
} // end anonymous namespace
char UnpackMachineBundles::ID = 0;
INITIALIZE_PASS(UnpackMachineBundles, "unpack-mi-bundle",
"Unpack machine instruction bundles", false, false)
FunctionPass *llvm::createUnpackMachineBundlesPass() {
return new UnpackMachineBundles();
}
bool UnpackMachineBundles::runOnMachineFunction(MachineFunction &MF) {
bool Changed = false;
for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
MachineBasicBlock *MBB = &*I;
for (MachineBasicBlock::instr_iterator MII = MBB->instr_begin(),
MIE = MBB->instr_end(); MII != MIE; ) {
MachineInstr *MI = &*MII;
// Remove BUNDLE instruction and the InsideBundle flags from bundled
// instructions.
if (MI->isBundle()) {
while (++MII != MIE && MII->isInsideBundle()) {
MII->setIsInsideBundle(false);
for (unsigned i = 0, e = MII->getNumOperands(); i != e; ++i) {
MachineOperand &MO = MII->getOperand(i);
if (MO.isReg() && MO.isInternalRead())
MO.setIsInternalRead(false);
}
}
MI->eraseFromParent();
Changed = true;
continue;
}
++MII;
}
}
return Changed;
}
/// FinalizeBundle - Finalize a machine instruction bundle which includes
/// a sequence of instructions starting from FirstMI to LastMI (inclusive).
/// This routine adds a BUNDLE instruction to represent the bundle, it adds
/// IsInternalRead markers to MachineOperands which are defined inside the
/// bundle, and it copies externally visible defs and uses to the BUNDLE
/// instruction.
void llvm::FinalizeBundle(MachineBasicBlock &MBB,
MachineBasicBlock::instr_iterator FirstMI,
MachineBasicBlock::instr_iterator LastMI) {
const TargetMachine &TM = MBB.getParent()->getTarget();
const TargetInstrInfo *TII = TM.getInstrInfo();
const TargetRegisterInfo *TRI = TM.getRegisterInfo();
MachineInstrBuilder MIB = BuildMI(MBB, FirstMI, FirstMI->getDebugLoc(),
TII->get(TargetOpcode::BUNDLE));
SmallVector<unsigned, 8> LocalDefs;
SmallSet<unsigned, 8> LocalDefSet;
SmallSet<unsigned, 8> DeadDefSet;
SmallSet<unsigned, 8> KilledDefSet;
SmallVector<unsigned, 8> ExternUses;
SmallSet<unsigned, 8> ExternUseSet;
SmallSet<unsigned, 8> KilledUseSet;
SmallSet<unsigned, 8> UndefUseSet;
SmallVector<MachineOperand*, 4> Defs;
do {
for (unsigned i = 0, e = FirstMI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = FirstMI->getOperand(i);
if (!MO.isReg())
continue;
if (MO.isDef()) {
Defs.push_back(&MO);
continue;
}
unsigned Reg = MO.getReg();
if (!Reg)
continue;
assert(TargetRegisterInfo::isPhysicalRegister(Reg));
if (LocalDefSet.count(Reg)) {
MO.setIsInternalRead();
if (MO.isKill())
// Internal def is now killed.
KilledDefSet.insert(Reg);
} else {
if (ExternUseSet.insert(Reg)) {
ExternUses.push_back(Reg);
if (MO.isUndef())
UndefUseSet.insert(Reg);
}
if (MO.isKill())
// External def is now killed.
KilledUseSet.insert(Reg);
}
}
for (unsigned i = 0, e = Defs.size(); i != e; ++i) {
MachineOperand &MO = *Defs[i];
unsigned Reg = MO.getReg();
if (!Reg)
continue;
if (LocalDefSet.insert(Reg)) {
LocalDefs.push_back(Reg);
if (MO.isDead()) {
DeadDefSet.insert(Reg);
}
} else {
// Re-defined inside the bundle, it's no longer killed.
KilledDefSet.erase(Reg);
if (!MO.isDead())
// Previously defined but dead.
DeadDefSet.erase(Reg);
}
if (!MO.isDead()) {
for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
unsigned SubReg = *SubRegs; ++SubRegs) {
if (LocalDefSet.insert(SubReg))
LocalDefs.push_back(SubReg);
}
}
}
FirstMI->setIsInsideBundle();
Defs.clear();
} while (FirstMI++ != LastMI);
SmallSet<unsigned, 8> Added;
for (unsigned i = 0, e = LocalDefs.size(); i != e; ++i) {
unsigned Reg = LocalDefs[i];
if (Added.insert(Reg)) {
// If it's not live beyond end of the bundle, mark it dead.
bool isDead = DeadDefSet.count(Reg) || KilledDefSet.count(Reg);
MIB.addReg(Reg, getDefRegState(true) | getDeadRegState(isDead) |
getImplRegState(true));
}
}
for (unsigned i = 0, e = ExternUses.size(); i != e; ++i) {
unsigned Reg = ExternUses[i];
bool isKill = KilledUseSet.count(Reg);
bool isUndef = UndefUseSet.count(Reg);
MIB.addReg(Reg, getKillRegState(isKill) | getUndefRegState(isUndef) |
getImplRegState(true));
}
}
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