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to finalize MI bundles (i.e. add BUNDLE instruction and computing register def and use lists of the BUNDLE instruction) and a pass to unpack bundles. - Teach more of MachineBasic and MachineInstr methods to be bundle aware. - Switch Thumb2 IT block to MI bundles and delete the hazard recognizer hack to prevent IT blocks from being broken apart. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146542 91177308-0d34-0410-b5e6-96231b3b80d8
181 lines
5.8 KiB
C++
181 lines
5.8 KiB
C++
//===-- lib/CodeGen/MachineInstrBundle.cpp --------------------------------===//
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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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#include "llvm/CodeGen/MachineInstrBundle.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include "llvm/ADT/SmallSet.h"
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#include "llvm/ADT/SmallVector.h"
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using namespace llvm;
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namespace {
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class UnpackMachineBundles : public MachineFunctionPass {
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public:
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static char ID; // Pass identification
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UnpackMachineBundles() : MachineFunctionPass(ID) {
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initializeUnpackMachineBundlesPass(*PassRegistry::getPassRegistry());
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}
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virtual bool runOnMachineFunction(MachineFunction &MF);
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};
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} // end anonymous namespace
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char UnpackMachineBundles::ID = 0;
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INITIALIZE_PASS(UnpackMachineBundles, "unpack-mi-bundle",
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"Unpack machine instruction bundles", false, false)
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FunctionPass *llvm::createUnpackMachineBundlesPass() {
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return new UnpackMachineBundles();
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}
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bool UnpackMachineBundles::runOnMachineFunction(MachineFunction &MF) {
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bool Changed = false;
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for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
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MachineBasicBlock *MBB = &*I;
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for (MachineBasicBlock::instr_iterator MII = MBB->instr_begin(),
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MIE = MBB->instr_end(); MII != MIE; ) {
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MachineInstr *MI = &*MII;
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// Remove BUNDLE instruction and the InsideBundle flags from bundled
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// instructions.
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if (MI->isBundle()) {
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while (++MII != MIE && MII->isInsideBundle()) {
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MII->setIsInsideBundle(false);
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for (unsigned i = 0, e = MII->getNumOperands(); i != e; ++i) {
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MachineOperand &MO = MII->getOperand(i);
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if (MO.isReg() && MO.isInternalRead())
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MO.setIsInternalRead(false);
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}
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}
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MI->eraseFromParent();
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Changed = true;
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continue;
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}
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++MII;
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}
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}
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return Changed;
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}
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/// FinalizeBundle - Finalize a machine instruction bundle which includes
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/// a sequence of instructions starting from FirstMI to LastMI (inclusive).
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/// This routine adds a BUNDLE instruction to represent the bundle, it adds
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/// IsInternalRead markers to MachineOperands which are defined inside the
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/// bundle, and it copies externally visible defs and uses to the BUNDLE
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/// instruction.
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void llvm::FinalizeBundle(MachineBasicBlock &MBB,
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MachineBasicBlock::instr_iterator FirstMI,
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MachineBasicBlock::instr_iterator LastMI) {
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const TargetMachine &TM = MBB.getParent()->getTarget();
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const TargetInstrInfo *TII = TM.getInstrInfo();
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const TargetRegisterInfo *TRI = TM.getRegisterInfo();
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MachineInstrBuilder MIB = BuildMI(MBB, FirstMI, FirstMI->getDebugLoc(),
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TII->get(TargetOpcode::BUNDLE));
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SmallVector<unsigned, 8> LocalDefs;
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SmallSet<unsigned, 8> LocalDefSet;
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SmallSet<unsigned, 8> DeadDefSet;
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SmallSet<unsigned, 8> KilledDefSet;
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SmallVector<unsigned, 8> ExternUses;
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SmallSet<unsigned, 8> ExternUseSet;
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SmallSet<unsigned, 8> KilledUseSet;
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SmallSet<unsigned, 8> UndefUseSet;
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SmallVector<MachineOperand*, 4> Defs;
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do {
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for (unsigned i = 0, e = FirstMI->getNumOperands(); i != e; ++i) {
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MachineOperand &MO = FirstMI->getOperand(i);
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if (!MO.isReg())
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continue;
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if (MO.isDef()) {
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Defs.push_back(&MO);
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continue;
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}
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unsigned Reg = MO.getReg();
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if (!Reg)
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continue;
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assert(TargetRegisterInfo::isPhysicalRegister(Reg));
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if (LocalDefSet.count(Reg)) {
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MO.setIsInternalRead();
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if (MO.isKill())
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// Internal def is now killed.
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KilledDefSet.insert(Reg);
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} else {
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if (ExternUseSet.insert(Reg)) {
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ExternUses.push_back(Reg);
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if (MO.isUndef())
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UndefUseSet.insert(Reg);
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}
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if (MO.isKill())
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// External def is now killed.
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KilledUseSet.insert(Reg);
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}
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}
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for (unsigned i = 0, e = Defs.size(); i != e; ++i) {
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MachineOperand &MO = *Defs[i];
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unsigned Reg = MO.getReg();
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if (!Reg)
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continue;
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if (LocalDefSet.insert(Reg)) {
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LocalDefs.push_back(Reg);
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if (MO.isDead()) {
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DeadDefSet.insert(Reg);
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}
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} else {
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// Re-defined inside the bundle, it's no longer killed.
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KilledDefSet.erase(Reg);
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if (!MO.isDead())
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// Previously defined but dead.
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DeadDefSet.erase(Reg);
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}
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if (!MO.isDead()) {
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for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
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unsigned SubReg = *SubRegs; ++SubRegs) {
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if (LocalDefSet.insert(SubReg))
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LocalDefs.push_back(SubReg);
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}
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}
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}
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FirstMI->setIsInsideBundle();
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Defs.clear();
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} while (FirstMI++ != LastMI);
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SmallSet<unsigned, 8> Added;
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for (unsigned i = 0, e = LocalDefs.size(); i != e; ++i) {
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unsigned Reg = LocalDefs[i];
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if (Added.insert(Reg)) {
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// If it's not live beyond end of the bundle, mark it dead.
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bool isDead = DeadDefSet.count(Reg) || KilledDefSet.count(Reg);
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MIB.addReg(Reg, getDefRegState(true) | getDeadRegState(isDead) |
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getImplRegState(true));
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}
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}
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for (unsigned i = 0, e = ExternUses.size(); i != e; ++i) {
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unsigned Reg = ExternUses[i];
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bool isKill = KilledUseSet.count(Reg);
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bool isUndef = UndefUseSet.count(Reg);
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MIB.addReg(Reg, getKillRegState(isKill) | getUndefRegState(isUndef) |
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getImplRegState(true));
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}
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}
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