1 //===-- lib/CodeGen/MachineInstrBundle.cpp --------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/CodeGen/MachineInstrBundle.h"
11 #include "llvm/CodeGen/MachineInstrBuilder.h"
12 #include "llvm/CodeGen/Passes.h"
13 #include "llvm/CodeGen/MachineFunctionPass.h"
14 #include "llvm/Target/TargetInstrInfo.h"
15 #include "llvm/Target/TargetMachine.h"
16 #include "llvm/Target/TargetRegisterInfo.h"
17 #include "llvm/ADT/SmallSet.h"
18 #include "llvm/ADT/SmallVector.h"
22 class UnpackMachineBundles : public MachineFunctionPass {
24 static char ID; // Pass identification
25 UnpackMachineBundles() : MachineFunctionPass(ID) {
26 initializeUnpackMachineBundlesPass(*PassRegistry::getPassRegistry());
29 virtual bool runOnMachineFunction(MachineFunction &MF);
31 } // end anonymous namespace
33 char UnpackMachineBundles::ID = 0;
34 INITIALIZE_PASS(UnpackMachineBundles, "unpack-mi-bundle",
35 "Unpack machine instruction bundles", false, false)
37 FunctionPass *llvm::createUnpackMachineBundlesPass() {
38 return new UnpackMachineBundles();
41 bool UnpackMachineBundles::runOnMachineFunction(MachineFunction &MF) {
43 for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
44 MachineBasicBlock *MBB = &*I;
46 for (MachineBasicBlock::instr_iterator MII = MBB->instr_begin(),
47 MIE = MBB->instr_end(); MII != MIE; ) {
48 MachineInstr *MI = &*MII;
50 // Remove BUNDLE instruction and the InsideBundle flags from bundled
53 while (++MII != MIE && MII->isInsideBundle()) {
54 MII->setIsInsideBundle(false);
55 for (unsigned i = 0, e = MII->getNumOperands(); i != e; ++i) {
56 MachineOperand &MO = MII->getOperand(i);
57 if (MO.isReg() && MO.isInternalRead())
58 MO.setIsInternalRead(false);
61 MI->eraseFromParent();
74 /// FinalizeBundle - Finalize a machine instruction bundle which includes
75 /// a sequence of instructions starting from FirstMI to LastMI (inclusive).
76 /// This routine adds a BUNDLE instruction to represent the bundle, it adds
77 /// IsInternalRead markers to MachineOperands which are defined inside the
78 /// bundle, and it copies externally visible defs and uses to the BUNDLE
80 void llvm::FinalizeBundle(MachineBasicBlock &MBB,
81 MachineBasicBlock::instr_iterator FirstMI,
82 MachineBasicBlock::instr_iterator LastMI) {
83 const TargetMachine &TM = MBB.getParent()->getTarget();
84 const TargetInstrInfo *TII = TM.getInstrInfo();
85 const TargetRegisterInfo *TRI = TM.getRegisterInfo();
87 MachineInstrBuilder MIB = BuildMI(MBB, FirstMI, FirstMI->getDebugLoc(),
88 TII->get(TargetOpcode::BUNDLE));
90 SmallVector<unsigned, 8> LocalDefs;
91 SmallSet<unsigned, 8> LocalDefSet;
92 SmallSet<unsigned, 8> DeadDefSet;
93 SmallSet<unsigned, 8> KilledDefSet;
94 SmallVector<unsigned, 8> ExternUses;
95 SmallSet<unsigned, 8> ExternUseSet;
96 SmallSet<unsigned, 8> KilledUseSet;
97 SmallSet<unsigned, 8> UndefUseSet;
98 SmallVector<MachineOperand*, 4> Defs;
100 for (unsigned i = 0, e = FirstMI->getNumOperands(); i != e; ++i) {
101 MachineOperand &MO = FirstMI->getOperand(i);
109 unsigned Reg = MO.getReg();
112 assert(TargetRegisterInfo::isPhysicalRegister(Reg));
113 if (LocalDefSet.count(Reg)) {
114 MO.setIsInternalRead();
116 // Internal def is now killed.
117 KilledDefSet.insert(Reg);
119 if (ExternUseSet.insert(Reg)) {
120 ExternUses.push_back(Reg);
122 UndefUseSet.insert(Reg);
125 // External def is now killed.
126 KilledUseSet.insert(Reg);
130 for (unsigned i = 0, e = Defs.size(); i != e; ++i) {
131 MachineOperand &MO = *Defs[i];
132 unsigned Reg = MO.getReg();
136 if (LocalDefSet.insert(Reg)) {
137 LocalDefs.push_back(Reg);
139 DeadDefSet.insert(Reg);
142 // Re-defined inside the bundle, it's no longer killed.
143 KilledDefSet.erase(Reg);
145 // Previously defined but dead.
146 DeadDefSet.erase(Reg);
150 for (const unsigned *SubRegs = TRI->getSubRegisters(Reg);
151 unsigned SubReg = *SubRegs; ++SubRegs) {
152 if (LocalDefSet.insert(SubReg))
153 LocalDefs.push_back(SubReg);
158 FirstMI->setIsInsideBundle();
160 } while (FirstMI++ != LastMI);
162 SmallSet<unsigned, 8> Added;
163 for (unsigned i = 0, e = LocalDefs.size(); i != e; ++i) {
164 unsigned Reg = LocalDefs[i];
165 if (Added.insert(Reg)) {
166 // If it's not live beyond end of the bundle, mark it dead.
167 bool isDead = DeadDefSet.count(Reg) || KilledDefSet.count(Reg);
168 MIB.addReg(Reg, getDefRegState(true) | getDeadRegState(isDead) |
169 getImplRegState(true));
173 for (unsigned i = 0, e = ExternUses.size(); i != e; ++i) {
174 unsigned Reg = ExternUses[i];
175 bool isKill = KilledUseSet.count(Reg);
176 bool isUndef = UndefUseSet.count(Reg);
177 MIB.addReg(Reg, getKillRegState(isKill) | getUndefRegState(isUndef) |
178 getImplRegState(true));