Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 1 | //===---------- SplitKit.cpp - Toolkit for splitting live ranges ----------===// |
| 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file is distributed under the University of Illinois Open Source |
| 6 | // License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // This file contains the SplitAnalysis class as well as mutator functions for |
| 11 | // live range splitting. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
Jakob Stoklund Olesen | 376dcbd | 2010-11-03 20:39:23 +0000 | [diff] [blame] | 15 | #define DEBUG_TYPE "regalloc" |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 16 | #include "SplitKit.h" |
Jakob Stoklund Olesen | a17768f | 2010-10-14 23:49:52 +0000 | [diff] [blame] | 17 | #include "LiveRangeEdit.h" |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 18 | #include "VirtRegMap.h" |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 19 | #include "llvm/ADT/Statistic.h" |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 20 | #include "llvm/CodeGen/LiveIntervalAnalysis.h" |
Jakob Stoklund Olesen | d68f458 | 2010-10-28 20:34:50 +0000 | [diff] [blame] | 21 | #include "llvm/CodeGen/MachineDominators.h" |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 22 | #include "llvm/CodeGen/MachineInstrBuilder.h" |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 23 | #include "llvm/CodeGen/MachineRegisterInfo.h" |
| 24 | #include "llvm/Support/Debug.h" |
| 25 | #include "llvm/Support/raw_ostream.h" |
Jakob Stoklund Olesen | 6a0dc07 | 2010-07-20 21:46:58 +0000 | [diff] [blame] | 26 | #include "llvm/Target/TargetInstrInfo.h" |
| 27 | #include "llvm/Target/TargetMachine.h" |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 28 | |
| 29 | using namespace llvm; |
| 30 | |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 31 | STATISTIC(NumFinished, "Number of splits finished"); |
| 32 | STATISTIC(NumSimple, "Number of splits that were simple"); |
| 33 | |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 34 | //===----------------------------------------------------------------------===// |
| 35 | // Split Analysis |
| 36 | //===----------------------------------------------------------------------===// |
| 37 | |
Jakob Stoklund Olesen | 1b847de | 2011-02-19 00:53:42 +0000 | [diff] [blame] | 38 | SplitAnalysis::SplitAnalysis(const VirtRegMap &vrm, |
Jakob Stoklund Olesen | f2c6e36 | 2010-07-20 23:50:15 +0000 | [diff] [blame] | 39 | const LiveIntervals &lis, |
| 40 | const MachineLoopInfo &mli) |
Jakob Stoklund Olesen | 1b847de | 2011-02-19 00:53:42 +0000 | [diff] [blame] | 41 | : MF(vrm.getMachineFunction()), |
| 42 | VRM(vrm), |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 43 | LIS(lis), |
| 44 | Loops(mli), |
Jakob Stoklund Olesen | 1b847de | 2011-02-19 00:53:42 +0000 | [diff] [blame] | 45 | TII(*MF.getTarget().getInstrInfo()), |
Jakob Stoklund Olesen | 1a77445 | 2011-04-05 04:20:27 +0000 | [diff] [blame] | 46 | CurLI(0), |
| 47 | LastSplitPoint(MF.getNumBlockIDs()) {} |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 48 | |
| 49 | void SplitAnalysis::clear() { |
Jakob Stoklund Olesen | b5fa933 | 2011-01-18 21:13:27 +0000 | [diff] [blame] | 50 | UseSlots.clear(); |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 51 | UseBlocks.clear(); |
| 52 | ThroughBlocks.clear(); |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 53 | CurLI = 0; |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 54 | } |
| 55 | |
Jakob Stoklund Olesen | 1a77445 | 2011-04-05 04:20:27 +0000 | [diff] [blame] | 56 | SlotIndex SplitAnalysis::computeLastSplitPoint(unsigned Num) { |
| 57 | const MachineBasicBlock *MBB = MF.getBlockNumbered(Num); |
| 58 | const MachineBasicBlock *LPad = MBB->getLandingPadSuccessor(); |
| 59 | std::pair<SlotIndex, SlotIndex> &LSP = LastSplitPoint[Num]; |
| 60 | |
| 61 | // Compute split points on the first call. The pair is independent of the |
| 62 | // current live interval. |
| 63 | if (!LSP.first.isValid()) { |
| 64 | MachineBasicBlock::const_iterator FirstTerm = MBB->getFirstTerminator(); |
| 65 | if (FirstTerm == MBB->end()) |
| 66 | LSP.first = LIS.getMBBEndIdx(MBB); |
| 67 | else |
| 68 | LSP.first = LIS.getInstructionIndex(FirstTerm); |
| 69 | |
| 70 | // If there is a landing pad successor, also find the call instruction. |
| 71 | if (!LPad) |
| 72 | return LSP.first; |
| 73 | // There may not be a call instruction (?) in which case we ignore LPad. |
| 74 | LSP.second = LSP.first; |
| 75 | for (MachineBasicBlock::const_iterator I = FirstTerm, E = MBB->begin(); |
| 76 | I != E; --I) |
| 77 | if (I->getDesc().isCall()) { |
| 78 | LSP.second = LIS.getInstructionIndex(I); |
| 79 | break; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | // If CurLI is live into a landing pad successor, move the last split point |
| 84 | // back to the call that may throw. |
Jakob Stoklund Olesen | 71d9e65 | 2011-04-05 23:43:16 +0000 | [diff] [blame] | 85 | if (LPad && LSP.second.isValid() && LIS.isLiveInToMBB(*CurLI, LPad)) |
Jakob Stoklund Olesen | 1a77445 | 2011-04-05 04:20:27 +0000 | [diff] [blame] | 86 | return LSP.second; |
| 87 | else |
| 88 | return LSP.first; |
Jakob Stoklund Olesen | 6a0dc07 | 2010-07-20 21:46:58 +0000 | [diff] [blame] | 89 | } |
| 90 | |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 91 | /// analyzeUses - Count instructions, basic blocks, and loops using CurLI. |
Jakob Stoklund Olesen | abff280 | 2010-07-20 16:12:37 +0000 | [diff] [blame] | 92 | void SplitAnalysis::analyzeUses() { |
Jakob Stoklund Olesen | a2948ef | 2011-04-05 15:18:18 +0000 | [diff] [blame] | 93 | assert(UseSlots.empty() && "Call clear first"); |
| 94 | |
| 95 | // First get all the defs from the interval values. This provides the correct |
| 96 | // slots for early clobbers. |
| 97 | for (LiveInterval::const_vni_iterator I = CurLI->vni_begin(), |
| 98 | E = CurLI->vni_end(); I != E; ++I) |
| 99 | if (!(*I)->isPHIDef() && !(*I)->isUnused()) |
| 100 | UseSlots.push_back((*I)->def); |
| 101 | |
| 102 | // Get use slots form the use-def chain. |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 103 | const MachineRegisterInfo &MRI = MF.getRegInfo(); |
Jakob Stoklund Olesen | a2948ef | 2011-04-05 15:18:18 +0000 | [diff] [blame] | 104 | for (MachineRegisterInfo::use_nodbg_iterator |
| 105 | I = MRI.use_nodbg_begin(CurLI->reg), E = MRI.use_nodbg_end(); I != E; |
| 106 | ++I) |
| 107 | if (!I.getOperand().isUndef()) |
| 108 | UseSlots.push_back(LIS.getInstructionIndex(&*I).getDefIndex()); |
| 109 | |
Jakob Stoklund Olesen | b5fa933 | 2011-01-18 21:13:27 +0000 | [diff] [blame] | 110 | array_pod_sort(UseSlots.begin(), UseSlots.end()); |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 111 | |
Jakob Stoklund Olesen | a2948ef | 2011-04-05 15:18:18 +0000 | [diff] [blame] | 112 | // Remove duplicates, keeping the smaller slot for each instruction. |
| 113 | // That is what we want for early clobbers. |
| 114 | UseSlots.erase(std::unique(UseSlots.begin(), UseSlots.end(), |
| 115 | SlotIndex::isSameInstr), |
| 116 | UseSlots.end()); |
| 117 | |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 118 | // Compute per-live block info. |
| 119 | if (!calcLiveBlockInfo()) { |
| 120 | // FIXME: calcLiveBlockInfo found inconsistencies in the live range. |
| 121 | // I am looking at you, SimpleRegisterCoalescing! |
| 122 | DEBUG(dbgs() << "*** Fixing inconsistent live interval! ***\n"); |
| 123 | const_cast<LiveIntervals&>(LIS) |
| 124 | .shrinkToUses(const_cast<LiveInterval*>(CurLI)); |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 125 | UseBlocks.clear(); |
| 126 | ThroughBlocks.clear(); |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 127 | bool fixed = calcLiveBlockInfo(); |
| 128 | (void)fixed; |
| 129 | assert(fixed && "Couldn't fix broken live interval"); |
| 130 | } |
| 131 | |
Jakob Stoklund Olesen | ef1f5cc | 2011-03-27 22:49:23 +0000 | [diff] [blame] | 132 | DEBUG(dbgs() << "Analyze counted " |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 133 | << UseSlots.size() << " instrs in " |
| 134 | << UseBlocks.size() << " blocks, through " |
Jakob Stoklund Olesen | f4afdfc | 2011-04-09 02:59:09 +0000 | [diff] [blame] | 135 | << NumThroughBlocks << " blocks.\n"); |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 136 | } |
| 137 | |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 138 | /// calcLiveBlockInfo - Fill the LiveBlocks array with information about blocks |
| 139 | /// where CurLI is live. |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 140 | bool SplitAnalysis::calcLiveBlockInfo() { |
Jakob Stoklund Olesen | f4afdfc | 2011-04-09 02:59:09 +0000 | [diff] [blame] | 141 | ThroughBlocks.resize(MF.getNumBlockIDs()); |
| 142 | NumThroughBlocks = 0; |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 143 | if (CurLI->empty()) |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 144 | return true; |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 145 | |
| 146 | LiveInterval::const_iterator LVI = CurLI->begin(); |
| 147 | LiveInterval::const_iterator LVE = CurLI->end(); |
| 148 | |
| 149 | SmallVectorImpl<SlotIndex>::const_iterator UseI, UseE; |
| 150 | UseI = UseSlots.begin(); |
| 151 | UseE = UseSlots.end(); |
| 152 | |
| 153 | // Loop over basic blocks where CurLI is live. |
| 154 | MachineFunction::iterator MFI = LIS.getMBBFromIndex(LVI->start); |
| 155 | for (;;) { |
| 156 | BlockInfo BI; |
| 157 | BI.MBB = MFI; |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 158 | SlotIndex Start, Stop; |
| 159 | tie(Start, Stop) = LIS.getSlotIndexes()->getMBBRange(BI.MBB); |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 160 | |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 161 | // LVI is the first live segment overlapping MBB. |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 162 | BI.LiveIn = LVI->start <= Start; |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 163 | if (!BI.LiveIn) |
| 164 | BI.Def = LVI->start; |
| 165 | |
| 166 | // Find the first and last uses in the block. |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 167 | bool Uses = UseI != UseE && *UseI < Stop; |
| 168 | if (Uses) { |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 169 | BI.FirstUse = *UseI; |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 170 | assert(BI.FirstUse >= Start); |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 171 | do ++UseI; |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 172 | while (UseI != UseE && *UseI < Stop); |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 173 | BI.LastUse = UseI[-1]; |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 174 | assert(BI.LastUse < Stop); |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 175 | } |
| 176 | |
| 177 | // Look for gaps in the live range. |
| 178 | bool hasGap = false; |
| 179 | BI.LiveOut = true; |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 180 | while (LVI->end < Stop) { |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 181 | SlotIndex LastStop = LVI->end; |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 182 | if (++LVI == LVE || LVI->start >= Stop) { |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 183 | BI.Kill = LastStop; |
| 184 | BI.LiveOut = false; |
| 185 | break; |
| 186 | } |
| 187 | if (LastStop < LVI->start) { |
| 188 | hasGap = true; |
| 189 | BI.Kill = LastStop; |
| 190 | BI.Def = LVI->start; |
| 191 | } |
| 192 | } |
| 193 | |
| 194 | // Don't set LiveThrough when the block has a gap. |
| 195 | BI.LiveThrough = !hasGap && BI.LiveIn && BI.LiveOut; |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 196 | if (Uses) |
| 197 | UseBlocks.push_back(BI); |
Jakob Stoklund Olesen | f4afdfc | 2011-04-09 02:59:09 +0000 | [diff] [blame] | 198 | else { |
| 199 | ++NumThroughBlocks; |
| 200 | ThroughBlocks.set(BI.MBB->getNumber()); |
| 201 | } |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 202 | // FIXME: This should never happen. The live range stops or starts without a |
| 203 | // corresponding use. An earlier pass did something wrong. |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 204 | if (!BI.LiveThrough && !Uses) |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 205 | return false; |
| 206 | |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 207 | // LVI is now at LVE or LVI->end >= Stop. |
| 208 | if (LVI == LVE) |
| 209 | break; |
| 210 | |
| 211 | // Live segment ends exactly at Stop. Move to the next segment. |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 212 | if (LVI->end == Stop && ++LVI == LVE) |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 213 | break; |
| 214 | |
| 215 | // Pick the next basic block. |
Jakob Stoklund Olesen | 6c8afd7 | 2011-04-04 15:32:15 +0000 | [diff] [blame] | 216 | if (LVI->start < Stop) |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 217 | ++MFI; |
| 218 | else |
| 219 | MFI = LIS.getMBBFromIndex(LVI->start); |
| 220 | } |
Jakob Stoklund Olesen | 2b0f9e7 | 2011-03-05 18:33:49 +0000 | [diff] [blame] | 221 | return true; |
Jakob Stoklund Olesen | f0ac26c | 2011-02-09 22:50:26 +0000 | [diff] [blame] | 222 | } |
| 223 | |
Jakob Stoklund Olesen | 9f4b893 | 2011-04-26 22:33:12 +0000 | [diff] [blame^] | 224 | unsigned SplitAnalysis::countLiveBlocks(const LiveInterval *cli) const { |
| 225 | if (cli->empty()) |
| 226 | return 0; |
| 227 | LiveInterval *li = const_cast<LiveInterval*>(cli); |
| 228 | LiveInterval::iterator LVI = li->begin(); |
| 229 | LiveInterval::iterator LVE = li->end(); |
| 230 | unsigned Count = 0; |
| 231 | |
| 232 | // Loop over basic blocks where li is live. |
| 233 | MachineFunction::const_iterator MFI = LIS.getMBBFromIndex(LVI->start); |
| 234 | SlotIndex Stop = LIS.getMBBEndIdx(MFI); |
| 235 | for (;;) { |
| 236 | ++Count; |
| 237 | LVI = li->advanceTo(LVI, Stop); |
| 238 | if (LVI == LVE) |
| 239 | return Count; |
| 240 | do { |
| 241 | ++MFI; |
| 242 | Stop = LIS.getMBBEndIdx(MFI); |
| 243 | } while (Stop <= LVI->start); |
| 244 | } |
| 245 | } |
| 246 | |
Jakob Stoklund Olesen | 06c0f25 | 2011-02-21 23:09:46 +0000 | [diff] [blame] | 247 | bool SplitAnalysis::isOriginalEndpoint(SlotIndex Idx) const { |
| 248 | unsigned OrigReg = VRM.getOriginal(CurLI->reg); |
| 249 | const LiveInterval &Orig = LIS.getInterval(OrigReg); |
| 250 | assert(!Orig.empty() && "Splitting empty interval?"); |
| 251 | LiveInterval::const_iterator I = Orig.find(Idx); |
| 252 | |
| 253 | // Range containing Idx should begin at Idx. |
| 254 | if (I != Orig.end() && I->start <= Idx) |
| 255 | return I->start == Idx; |
| 256 | |
| 257 | // Range does not contain Idx, previous must end at Idx. |
| 258 | return I != Orig.begin() && (--I)->end == Idx; |
| 259 | } |
| 260 | |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 261 | void SplitAnalysis::analyze(const LiveInterval *li) { |
| 262 | clear(); |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 263 | CurLI = li; |
Jakob Stoklund Olesen | abff280 | 2010-07-20 16:12:37 +0000 | [diff] [blame] | 264 | analyzeUses(); |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 265 | } |
| 266 | |
Jakob Stoklund Olesen | 697483a | 2010-12-15 17:49:52 +0000 | [diff] [blame] | 267 | |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 268 | //===----------------------------------------------------------------------===// |
| 269 | // Split Editor |
| 270 | //===----------------------------------------------------------------------===// |
| 271 | |
| 272 | /// Create a new SplitEditor for editing the LiveInterval analyzed by SA. |
Jakob Stoklund Olesen | d68f458 | 2010-10-28 20:34:50 +0000 | [diff] [blame] | 273 | SplitEditor::SplitEditor(SplitAnalysis &sa, |
| 274 | LiveIntervals &lis, |
| 275 | VirtRegMap &vrm, |
Jakob Stoklund Olesen | bece06f | 2011-03-03 01:29:13 +0000 | [diff] [blame] | 276 | MachineDominatorTree &mdt) |
Jakob Stoklund Olesen | 0eeca44 | 2011-02-19 00:42:33 +0000 | [diff] [blame] | 277 | : SA(sa), LIS(lis), VRM(vrm), |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 278 | MRI(vrm.getMachineFunction().getRegInfo()), |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 279 | MDT(mdt), |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 280 | TII(*vrm.getMachineFunction().getTarget().getInstrInfo()), |
| 281 | TRI(*vrm.getMachineFunction().getTarget().getRegisterInfo()), |
Jakob Stoklund Olesen | bece06f | 2011-03-03 01:29:13 +0000 | [diff] [blame] | 282 | Edit(0), |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 283 | OpenIdx(0), |
| 284 | RegAssign(Allocator) |
Jakob Stoklund Olesen | bece06f | 2011-03-03 01:29:13 +0000 | [diff] [blame] | 285 | {} |
| 286 | |
| 287 | void SplitEditor::reset(LiveRangeEdit &lre) { |
| 288 | Edit = &lre; |
| 289 | OpenIdx = 0; |
| 290 | RegAssign.clear(); |
| 291 | Values.clear(); |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 292 | |
| 293 | // We don't need to clear LiveOutCache, only LiveOutSeen entries are read. |
| 294 | LiveOutSeen.clear(); |
Jakob Stoklund Olesen | bece06f | 2011-03-03 01:29:13 +0000 | [diff] [blame] | 295 | |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 296 | // We don't need an AliasAnalysis since we will only be performing |
| 297 | // cheap-as-a-copy remats anyway. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 298 | Edit->anyRematerializable(LIS, TII, 0); |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 299 | } |
| 300 | |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 301 | void SplitEditor::dump() const { |
| 302 | if (RegAssign.empty()) { |
| 303 | dbgs() << " empty\n"; |
| 304 | return; |
| 305 | } |
| 306 | |
| 307 | for (RegAssignMap::const_iterator I = RegAssign.begin(); I.valid(); ++I) |
| 308 | dbgs() << " [" << I.start() << ';' << I.stop() << "):" << I.value(); |
| 309 | dbgs() << '\n'; |
Jakob Stoklund Olesen | 5fa42a4 | 2010-09-21 22:32:21 +0000 | [diff] [blame] | 310 | } |
| 311 | |
Jakob Stoklund Olesen | 670ccd1 | 2011-03-01 23:14:53 +0000 | [diff] [blame] | 312 | VNInfo *SplitEditor::defValue(unsigned RegIdx, |
| 313 | const VNInfo *ParentVNI, |
| 314 | SlotIndex Idx) { |
| 315 | assert(ParentVNI && "Mapping NULL value"); |
| 316 | assert(Idx.isValid() && "Invalid SlotIndex"); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 317 | assert(Edit->getParent().getVNInfoAt(Idx) == ParentVNI && "Bad Parent VNI"); |
| 318 | LiveInterval *LI = Edit->get(RegIdx); |
Jakob Stoklund Olesen | 670ccd1 | 2011-03-01 23:14:53 +0000 | [diff] [blame] | 319 | |
| 320 | // Create a new value. |
| 321 | VNInfo *VNI = LI->getNextValue(Idx, 0, LIS.getVNInfoAllocator()); |
| 322 | |
Jakob Stoklund Olesen | 670ccd1 | 2011-03-01 23:14:53 +0000 | [diff] [blame] | 323 | // Use insert for lookup, so we can add missing values with a second lookup. |
| 324 | std::pair<ValueMap::iterator, bool> InsP = |
| 325 | Values.insert(std::make_pair(std::make_pair(RegIdx, ParentVNI->id), VNI)); |
| 326 | |
| 327 | // This was the first time (RegIdx, ParentVNI) was mapped. |
| 328 | // Keep it as a simple def without any liveness. |
| 329 | if (InsP.second) |
| 330 | return VNI; |
| 331 | |
| 332 | // If the previous value was a simple mapping, add liveness for it now. |
| 333 | if (VNInfo *OldVNI = InsP.first->second) { |
| 334 | SlotIndex Def = OldVNI->def; |
| 335 | LI->addRange(LiveRange(Def, Def.getNextSlot(), OldVNI)); |
| 336 | // No longer a simple mapping. |
| 337 | InsP.first->second = 0; |
| 338 | } |
| 339 | |
| 340 | // This is a complex mapping, add liveness for VNI |
| 341 | SlotIndex Def = VNI->def; |
| 342 | LI->addRange(LiveRange(Def, Def.getNextSlot(), VNI)); |
| 343 | |
| 344 | return VNI; |
| 345 | } |
| 346 | |
| 347 | void SplitEditor::markComplexMapped(unsigned RegIdx, const VNInfo *ParentVNI) { |
| 348 | assert(ParentVNI && "Mapping NULL value"); |
| 349 | VNInfo *&VNI = Values[std::make_pair(RegIdx, ParentVNI->id)]; |
| 350 | |
| 351 | // ParentVNI was either unmapped or already complex mapped. Either way. |
| 352 | if (!VNI) |
| 353 | return; |
| 354 | |
| 355 | // This was previously a single mapping. Make sure the old def is represented |
| 356 | // by a trivial live range. |
| 357 | SlotIndex Def = VNI->def; |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 358 | Edit->get(RegIdx)->addRange(LiveRange(Def, Def.getNextSlot(), VNI)); |
Jakob Stoklund Olesen | 670ccd1 | 2011-03-01 23:14:53 +0000 | [diff] [blame] | 359 | VNI = 0; |
| 360 | } |
| 361 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 362 | // extendRange - Extend the live range to reach Idx. |
| 363 | // Potentially create phi-def values. |
| 364 | void SplitEditor::extendRange(unsigned RegIdx, SlotIndex Idx) { |
| 365 | assert(Idx.isValid() && "Invalid SlotIndex"); |
| 366 | MachineBasicBlock *IdxMBB = LIS.getMBBFromIndex(Idx); |
| 367 | assert(IdxMBB && "No MBB at Idx"); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 368 | LiveInterval *LI = Edit->get(RegIdx); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 369 | |
| 370 | // Is there a def in the same MBB we can extend? |
| 371 | if (LI->extendInBlock(LIS.getMBBStartIdx(IdxMBB), Idx)) |
| 372 | return; |
| 373 | |
| 374 | // Now for the fun part. We know that ParentVNI potentially has multiple defs, |
| 375 | // and we may need to create even more phi-defs to preserve VNInfo SSA form. |
| 376 | // Perform a search for all predecessor blocks where we know the dominating |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 377 | // VNInfo. |
| 378 | VNInfo *VNI = findReachingDefs(LI, IdxMBB, Idx.getNextSlot()); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 379 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 380 | // When there were multiple different values, we may need new PHIs. |
| 381 | if (!VNI) |
| 382 | return updateSSA(); |
| 383 | |
| 384 | // Poor man's SSA update for the single-value case. |
| 385 | LiveOutPair LOP(VNI, MDT[LIS.getMBBFromIndex(VNI->def)]); |
| 386 | for (SmallVectorImpl<LiveInBlock>::iterator I = LiveInBlocks.begin(), |
| 387 | E = LiveInBlocks.end(); I != E; ++I) { |
| 388 | MachineBasicBlock *MBB = I->DomNode->getBlock(); |
| 389 | SlotIndex Start = LIS.getMBBStartIdx(MBB); |
| 390 | if (I->Kill.isValid()) |
| 391 | LI->addRange(LiveRange(Start, I->Kill, VNI)); |
| 392 | else { |
| 393 | LiveOutCache[MBB] = LOP; |
| 394 | LI->addRange(LiveRange(Start, LIS.getMBBEndIdx(MBB), VNI)); |
| 395 | } |
| 396 | } |
| 397 | } |
| 398 | |
| 399 | /// findReachingDefs - Search the CFG for known live-out values. |
| 400 | /// Add required live-in blocks to LiveInBlocks. |
| 401 | VNInfo *SplitEditor::findReachingDefs(LiveInterval *LI, |
| 402 | MachineBasicBlock *KillMBB, |
| 403 | SlotIndex Kill) { |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 404 | // Initialize the live-out cache the first time it is needed. |
| 405 | if (LiveOutSeen.empty()) { |
| 406 | unsigned N = VRM.getMachineFunction().getNumBlockIDs(); |
| 407 | LiveOutSeen.resize(N); |
| 408 | LiveOutCache.resize(N); |
| 409 | } |
| 410 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 411 | // Blocks where LI should be live-in. |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 412 | SmallVector<MachineBasicBlock*, 16> WorkList(1, KillMBB); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 413 | |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 414 | // Remember if we have seen more than one value. |
| 415 | bool UniqueVNI = true; |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 416 | VNInfo *TheVNI = 0; |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 417 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 418 | // Using LiveOutCache as a visited set, perform a BFS for all reaching defs. |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 419 | for (unsigned i = 0; i != WorkList.size(); ++i) { |
| 420 | MachineBasicBlock *MBB = WorkList[i]; |
Jakob Stoklund Olesen | 7cec179 | 2011-03-18 03:06:02 +0000 | [diff] [blame] | 421 | assert(!MBB->pred_empty() && "Value live-in to entry block?"); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 422 | for (MachineBasicBlock::pred_iterator PI = MBB->pred_begin(), |
| 423 | PE = MBB->pred_end(); PI != PE; ++PI) { |
| 424 | MachineBasicBlock *Pred = *PI; |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 425 | LiveOutPair &LOP = LiveOutCache[Pred]; |
| 426 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 427 | // Is this a known live-out block? |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 428 | if (LiveOutSeen.test(Pred->getNumber())) { |
| 429 | if (VNInfo *VNI = LOP.first) { |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 430 | if (TheVNI && TheVNI != VNI) |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 431 | UniqueVNI = false; |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 432 | TheVNI = VNI; |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 433 | } |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 434 | continue; |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 435 | } |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 436 | |
| 437 | // First time. LOP is garbage and must be cleared below. |
| 438 | LiveOutSeen.set(Pred->getNumber()); |
| 439 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 440 | // Does Pred provide a live-out value? |
| 441 | SlotIndex Start, Last; |
| 442 | tie(Start, Last) = LIS.getSlotIndexes()->getMBBRange(Pred); |
| 443 | Last = Last.getPrevSlot(); |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 444 | VNInfo *VNI = LI->extendInBlock(Start, Last); |
| 445 | LOP.first = VNI; |
| 446 | if (VNI) { |
| 447 | LOP.second = MDT[LIS.getMBBFromIndex(VNI->def)]; |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 448 | if (TheVNI && TheVNI != VNI) |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 449 | UniqueVNI = false; |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 450 | TheVNI = VNI; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 451 | continue; |
| 452 | } |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 453 | LOP.second = 0; |
| 454 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 455 | // No, we need a live-in value for Pred as well |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 456 | if (Pred != KillMBB) |
| 457 | WorkList.push_back(Pred); |
Jakob Stoklund Olesen | 8701768 | 2011-03-03 01:29:10 +0000 | [diff] [blame] | 458 | else |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 459 | // Loopback to KillMBB, so value is really live through. |
| 460 | Kill = SlotIndex(); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 461 | } |
| 462 | } |
| 463 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 464 | // Transfer WorkList to LiveInBlocks in reverse order. |
| 465 | // This ordering works best with updateSSA(). |
| 466 | LiveInBlocks.clear(); |
| 467 | LiveInBlocks.reserve(WorkList.size()); |
| 468 | while(!WorkList.empty()) |
| 469 | LiveInBlocks.push_back(MDT[WorkList.pop_back_val()]); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 470 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 471 | // The kill block may not be live-through. |
| 472 | assert(LiveInBlocks.back().DomNode->getBlock() == KillMBB); |
| 473 | LiveInBlocks.back().Kill = Kill; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 474 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 475 | return UniqueVNI ? TheVNI : 0; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 476 | } |
| 477 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 478 | void SplitEditor::updateSSA() { |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 479 | // This is essentially the same iterative algorithm that SSAUpdater uses, |
| 480 | // except we already have a dominator tree, so we don't have to recompute it. |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 481 | unsigned Changes; |
| 482 | do { |
| 483 | Changes = 0; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 484 | // Propagate live-out values down the dominator tree, inserting phi-defs |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 485 | // when necessary. |
| 486 | for (SmallVectorImpl<LiveInBlock>::iterator I = LiveInBlocks.begin(), |
| 487 | E = LiveInBlocks.end(); I != E; ++I) { |
| 488 | MachineDomTreeNode *Node = I->DomNode; |
| 489 | // Skip block if the live-in value has already been determined. |
| 490 | if (!Node) |
| 491 | continue; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 492 | MachineBasicBlock *MBB = Node->getBlock(); |
| 493 | MachineDomTreeNode *IDom = Node->getIDom(); |
| 494 | LiveOutPair IDomValue; |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 495 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 496 | // We need a live-in value to a block with no immediate dominator? |
| 497 | // This is probably an unreachable block that has survived somehow. |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 498 | bool needPHI = !IDom || !LiveOutSeen.test(IDom->getBlock()->getNumber()); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 499 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 500 | // IDom dominates all of our predecessors, but it may not be their |
| 501 | // immediate dominator. Check if any of them have live-out values that are |
| 502 | // properly dominated by IDom. If so, we need a phi-def here. |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 503 | if (!needPHI) { |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 504 | IDomValue = LiveOutCache[IDom->getBlock()]; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 505 | for (MachineBasicBlock::pred_iterator PI = MBB->pred_begin(), |
| 506 | PE = MBB->pred_end(); PI != PE; ++PI) { |
| 507 | LiveOutPair Value = LiveOutCache[*PI]; |
| 508 | if (!Value.first || Value.first == IDomValue.first) |
| 509 | continue; |
| 510 | // This predecessor is carrying something other than IDomValue. |
| 511 | // It could be because IDomValue hasn't propagated yet, or it could be |
| 512 | // because MBB is in the dominance frontier of that value. |
| 513 | if (MDT.dominates(IDom, Value.second)) { |
| 514 | needPHI = true; |
| 515 | break; |
| 516 | } |
| 517 | } |
| 518 | } |
| 519 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 520 | // The value may be live-through even if Kill is set, as can happen when |
| 521 | // we are called from extendRange. In that case LiveOutSeen is true, and |
| 522 | // LiveOutCache indicates a foreign or missing value. |
| 523 | LiveOutPair &LOP = LiveOutCache[MBB]; |
| 524 | |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 525 | // Create a phi-def if required. |
| 526 | if (needPHI) { |
| 527 | ++Changes; |
| 528 | SlotIndex Start = LIS.getMBBStartIdx(MBB); |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 529 | unsigned RegIdx = RegAssign.lookup(Start); |
| 530 | LiveInterval *LI = Edit->get(RegIdx); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 531 | VNInfo *VNI = LI->getNextValue(Start, 0, LIS.getVNInfoAllocator()); |
| 532 | VNI->setIsPHIDef(true); |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 533 | I->Value = VNI; |
| 534 | // This block is done, we know the final value. |
| 535 | I->DomNode = 0; |
| 536 | if (I->Kill.isValid()) |
| 537 | LI->addRange(LiveRange(Start, I->Kill, VNI)); |
| 538 | else { |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 539 | LI->addRange(LiveRange(Start, LIS.getMBBEndIdx(MBB), VNI)); |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 540 | LOP = LiveOutPair(VNI, Node); |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 541 | } |
| 542 | } else if (IDomValue.first) { |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 543 | // No phi-def here. Remember incoming value. |
| 544 | I->Value = IDomValue.first; |
| 545 | if (I->Kill.isValid()) |
| 546 | continue; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 547 | // Propagate IDomValue if needed: |
| 548 | // MBB is live-out and doesn't define its own value. |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 549 | if (LOP.second != Node && LOP.first != IDomValue.first) { |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 550 | ++Changes; |
Jakob Stoklund Olesen | 13ba2da | 2011-03-04 00:15:36 +0000 | [diff] [blame] | 551 | LOP = IDomValue; |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 552 | } |
| 553 | } |
| 554 | } |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 555 | } while (Changes); |
| 556 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 557 | // The values in LiveInBlocks are now accurate. No more phi-defs are needed |
| 558 | // for these blocks, so we can color the live ranges. |
| 559 | for (SmallVectorImpl<LiveInBlock>::iterator I = LiveInBlocks.begin(), |
| 560 | E = LiveInBlocks.end(); I != E; ++I) { |
| 561 | if (!I->DomNode) |
| 562 | continue; |
| 563 | assert(I->Value && "No live-in value found"); |
| 564 | MachineBasicBlock *MBB = I->DomNode->getBlock(); |
| 565 | SlotIndex Start = LIS.getMBBStartIdx(MBB); |
| 566 | unsigned RegIdx = RegAssign.lookup(Start); |
| 567 | LiveInterval *LI = Edit->get(RegIdx); |
| 568 | LI->addRange(LiveRange(Start, I->Kill.isValid() ? |
| 569 | I->Kill : LIS.getMBBEndIdx(MBB), I->Value)); |
| 570 | } |
Jakob Stoklund Olesen | 1c38ba6 | 2011-03-02 01:59:34 +0000 | [diff] [blame] | 571 | } |
| 572 | |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 573 | VNInfo *SplitEditor::defFromParent(unsigned RegIdx, |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 574 | VNInfo *ParentVNI, |
| 575 | SlotIndex UseIdx, |
| 576 | MachineBasicBlock &MBB, |
| 577 | MachineBasicBlock::iterator I) { |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 578 | MachineInstr *CopyMI = 0; |
| 579 | SlotIndex Def; |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 580 | LiveInterval *LI = Edit->get(RegIdx); |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 581 | |
| 582 | // Attempt cheap-as-a-copy rematerialization. |
| 583 | LiveRangeEdit::Remat RM(ParentVNI); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 584 | if (Edit->canRematerializeAt(RM, UseIdx, true, LIS)) { |
| 585 | Def = Edit->rematerializeAt(MBB, I, LI->reg, RM, LIS, TII, TRI); |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 586 | } else { |
| 587 | // Can't remat, just insert a copy from parent. |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 588 | CopyMI = BuildMI(MBB, I, DebugLoc(), TII.get(TargetOpcode::COPY), LI->reg) |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 589 | .addReg(Edit->getReg()); |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 590 | Def = LIS.InsertMachineInstrInMaps(CopyMI).getDefIndex(); |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 591 | } |
| 592 | |
Jakob Stoklund Olesen | 670ccd1 | 2011-03-01 23:14:53 +0000 | [diff] [blame] | 593 | // Define the value in Reg. |
| 594 | VNInfo *VNI = defValue(RegIdx, ParentVNI, Def); |
| 595 | VNI->setCopy(CopyMI); |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 596 | return VNI; |
| 597 | } |
| 598 | |
Jakob Stoklund Olesen | 7536f72 | 2010-08-04 22:08:39 +0000 | [diff] [blame] | 599 | /// Create a new virtual register and live interval. |
Jakob Stoklund Olesen | e1b43c3 | 2011-04-12 18:11:31 +0000 | [diff] [blame] | 600 | unsigned SplitEditor::openIntv() { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 601 | // Create the complement as index 0. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 602 | if (Edit->empty()) |
Jakob Stoklund Olesen | 6a3dbd3 | 2011-03-17 20:37:07 +0000 | [diff] [blame] | 603 | Edit->create(LIS, VRM); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 604 | |
| 605 | // Create the open interval. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 606 | OpenIdx = Edit->size(); |
Jakob Stoklund Olesen | 6a3dbd3 | 2011-03-17 20:37:07 +0000 | [diff] [blame] | 607 | Edit->create(LIS, VRM); |
Jakob Stoklund Olesen | e1b43c3 | 2011-04-12 18:11:31 +0000 | [diff] [blame] | 608 | return OpenIdx; |
| 609 | } |
| 610 | |
| 611 | void SplitEditor::selectIntv(unsigned Idx) { |
| 612 | assert(Idx != 0 && "Cannot select the complement interval"); |
| 613 | assert(Idx < Edit->size() && "Can only select previously opened interval"); |
| 614 | OpenIdx = Idx; |
Jakob Stoklund Olesen | 7536f72 | 2010-08-04 22:08:39 +0000 | [diff] [blame] | 615 | } |
| 616 | |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 617 | SlotIndex SplitEditor::enterIntvBefore(SlotIndex Idx) { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 618 | assert(OpenIdx && "openIntv not called before enterIntvBefore"); |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 619 | DEBUG(dbgs() << " enterIntvBefore " << Idx); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 620 | Idx = Idx.getBaseIndex(); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 621 | VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Idx); |
Jakob Stoklund Olesen | f6a129a | 2010-09-16 00:01:36 +0000 | [diff] [blame] | 622 | if (!ParentVNI) { |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 623 | DEBUG(dbgs() << ": not live\n"); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 624 | return Idx; |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 625 | } |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 626 | DEBUG(dbgs() << ": valno " << ParentVNI->id << '\n'); |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 627 | MachineInstr *MI = LIS.getInstructionFromIndex(Idx); |
Jakob Stoklund Olesen | f6a129a | 2010-09-16 00:01:36 +0000 | [diff] [blame] | 628 | assert(MI && "enterIntvBefore called with invalid index"); |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 629 | |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 630 | VNInfo *VNI = defFromParent(OpenIdx, ParentVNI, Idx, *MI->getParent(), MI); |
| 631 | return VNI->def; |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 632 | } |
| 633 | |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 634 | SlotIndex SplitEditor::enterIntvAtEnd(MachineBasicBlock &MBB) { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 635 | assert(OpenIdx && "openIntv not called before enterIntvAtEnd"); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 636 | SlotIndex End = LIS.getMBBEndIdx(&MBB); |
| 637 | SlotIndex Last = End.getPrevSlot(); |
| 638 | DEBUG(dbgs() << " enterIntvAtEnd BB#" << MBB.getNumber() << ", " << Last); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 639 | VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Last); |
Jakob Stoklund Olesen | f6a129a | 2010-09-16 00:01:36 +0000 | [diff] [blame] | 640 | if (!ParentVNI) { |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 641 | DEBUG(dbgs() << ": not live\n"); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 642 | return End; |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 643 | } |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 644 | DEBUG(dbgs() << ": valno " << ParentVNI->id); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 645 | VNInfo *VNI = defFromParent(OpenIdx, ParentVNI, Last, MBB, |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 646 | LIS.getLastSplitPoint(Edit->getParent(), &MBB)); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 647 | RegAssign.insert(VNI->def, End, OpenIdx); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 648 | DEBUG(dump()); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 649 | return VNI->def; |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 650 | } |
| 651 | |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 652 | /// useIntv - indicate that all instructions in MBB should use OpenLI. |
Jakob Stoklund Olesen | 7536f72 | 2010-08-04 22:08:39 +0000 | [diff] [blame] | 653 | void SplitEditor::useIntv(const MachineBasicBlock &MBB) { |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 654 | useIntv(LIS.getMBBStartIdx(&MBB), LIS.getMBBEndIdx(&MBB)); |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 655 | } |
| 656 | |
Jakob Stoklund Olesen | 7536f72 | 2010-08-04 22:08:39 +0000 | [diff] [blame] | 657 | void SplitEditor::useIntv(SlotIndex Start, SlotIndex End) { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 658 | assert(OpenIdx && "openIntv not called before useIntv"); |
| 659 | DEBUG(dbgs() << " useIntv [" << Start << ';' << End << "):"); |
| 660 | RegAssign.insert(Start, End, OpenIdx); |
| 661 | DEBUG(dump()); |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 662 | } |
| 663 | |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 664 | SlotIndex SplitEditor::leaveIntvAfter(SlotIndex Idx) { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 665 | assert(OpenIdx && "openIntv not called before leaveIntvAfter"); |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 666 | DEBUG(dbgs() << " leaveIntvAfter " << Idx); |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 667 | |
Jakob Stoklund Olesen | f6a129a | 2010-09-16 00:01:36 +0000 | [diff] [blame] | 668 | // The interval must be live beyond the instruction at Idx. |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 669 | Idx = Idx.getBoundaryIndex(); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 670 | VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Idx); |
Jakob Stoklund Olesen | f6a129a | 2010-09-16 00:01:36 +0000 | [diff] [blame] | 671 | if (!ParentVNI) { |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 672 | DEBUG(dbgs() << ": not live\n"); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 673 | return Idx.getNextSlot(); |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 674 | } |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 675 | DEBUG(dbgs() << ": valno " << ParentVNI->id << '\n'); |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 676 | |
Jakob Stoklund Olesen | 01cb34b | 2011-02-08 18:50:18 +0000 | [diff] [blame] | 677 | MachineInstr *MI = LIS.getInstructionFromIndex(Idx); |
| 678 | assert(MI && "No instruction at index"); |
| 679 | VNInfo *VNI = defFromParent(0, ParentVNI, Idx, *MI->getParent(), |
| 680 | llvm::next(MachineBasicBlock::iterator(MI))); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 681 | return VNI->def; |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 682 | } |
| 683 | |
Jakob Stoklund Olesen | 9b05777 | 2011-02-09 23:30:25 +0000 | [diff] [blame] | 684 | SlotIndex SplitEditor::leaveIntvBefore(SlotIndex Idx) { |
| 685 | assert(OpenIdx && "openIntv not called before leaveIntvBefore"); |
| 686 | DEBUG(dbgs() << " leaveIntvBefore " << Idx); |
| 687 | |
| 688 | // The interval must be live into the instruction at Idx. |
| 689 | Idx = Idx.getBoundaryIndex(); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 690 | VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Idx); |
Jakob Stoklund Olesen | 9b05777 | 2011-02-09 23:30:25 +0000 | [diff] [blame] | 691 | if (!ParentVNI) { |
| 692 | DEBUG(dbgs() << ": not live\n"); |
| 693 | return Idx.getNextSlot(); |
| 694 | } |
| 695 | DEBUG(dbgs() << ": valno " << ParentVNI->id << '\n'); |
| 696 | |
| 697 | MachineInstr *MI = LIS.getInstructionFromIndex(Idx); |
| 698 | assert(MI && "No instruction at index"); |
| 699 | VNInfo *VNI = defFromParent(0, ParentVNI, Idx, *MI->getParent(), MI); |
| 700 | return VNI->def; |
| 701 | } |
| 702 | |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 703 | SlotIndex SplitEditor::leaveIntvAtTop(MachineBasicBlock &MBB) { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 704 | assert(OpenIdx && "openIntv not called before leaveIntvAtTop"); |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 705 | SlotIndex Start = LIS.getMBBStartIdx(&MBB); |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 706 | DEBUG(dbgs() << " leaveIntvAtTop BB#" << MBB.getNumber() << ", " << Start); |
Jakob Stoklund Olesen | 7536f72 | 2010-08-04 22:08:39 +0000 | [diff] [blame] | 707 | |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 708 | VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Start); |
Jakob Stoklund Olesen | f6a129a | 2010-09-16 00:01:36 +0000 | [diff] [blame] | 709 | if (!ParentVNI) { |
Jakob Stoklund Olesen | 9b24afe | 2010-10-07 17:56:35 +0000 | [diff] [blame] | 710 | DEBUG(dbgs() << ": not live\n"); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 711 | return Start; |
Jakob Stoklund Olesen | 7536f72 | 2010-08-04 22:08:39 +0000 | [diff] [blame] | 712 | } |
| 713 | |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 714 | VNInfo *VNI = defFromParent(0, ParentVNI, Start, MBB, |
Jakob Stoklund Olesen | cfa7134 | 2010-11-10 19:31:50 +0000 | [diff] [blame] | 715 | MBB.SkipPHIsAndLabels(MBB.begin())); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 716 | RegAssign.insert(Start, VNI->def, OpenIdx); |
| 717 | DEBUG(dump()); |
Jakob Stoklund Olesen | 207c868 | 2011-02-03 17:04:16 +0000 | [diff] [blame] | 718 | return VNI->def; |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 719 | } |
| 720 | |
Jakob Stoklund Olesen | 5c716bd | 2011-02-08 18:50:21 +0000 | [diff] [blame] | 721 | void SplitEditor::overlapIntv(SlotIndex Start, SlotIndex End) { |
| 722 | assert(OpenIdx && "openIntv not called before overlapIntv"); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 723 | const VNInfo *ParentVNI = Edit->getParent().getVNInfoAt(Start); |
| 724 | assert(ParentVNI == Edit->getParent().getVNInfoAt(End.getPrevSlot()) && |
Jakob Stoklund Olesen | 5c716bd | 2011-02-08 18:50:21 +0000 | [diff] [blame] | 725 | "Parent changes value in extended range"); |
Jakob Stoklund Olesen | 5c716bd | 2011-02-08 18:50:21 +0000 | [diff] [blame] | 726 | assert(LIS.getMBBFromIndex(Start) == LIS.getMBBFromIndex(End) && |
| 727 | "Range cannot span basic blocks"); |
| 728 | |
Jakob Stoklund Olesen | d3fdaeb | 2011-03-02 00:49:28 +0000 | [diff] [blame] | 729 | // The complement interval will be extended as needed by extendRange(). |
Jakob Stoklund Olesen | b3dd826 | 2011-04-05 23:43:14 +0000 | [diff] [blame] | 730 | if (ParentVNI) |
| 731 | markComplexMapped(0, ParentVNI); |
Jakob Stoklund Olesen | 5c716bd | 2011-02-08 18:50:21 +0000 | [diff] [blame] | 732 | DEBUG(dbgs() << " overlapIntv [" << Start << ';' << End << "):"); |
| 733 | RegAssign.insert(Start, End, OpenIdx); |
| 734 | DEBUG(dump()); |
| 735 | } |
| 736 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 737 | /// transferValues - Transfer all possible values to the new live ranges. |
| 738 | /// Values that were rematerialized are left alone, they need extendRange(). |
| 739 | bool SplitEditor::transferValues() { |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 740 | bool Skipped = false; |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 741 | LiveInBlocks.clear(); |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 742 | RegAssignMap::const_iterator AssignI = RegAssign.begin(); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 743 | for (LiveInterval::const_iterator ParentI = Edit->getParent().begin(), |
| 744 | ParentE = Edit->getParent().end(); ParentI != ParentE; ++ParentI) { |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 745 | DEBUG(dbgs() << " blit " << *ParentI << ':'); |
| 746 | VNInfo *ParentVNI = ParentI->valno; |
| 747 | // RegAssign has holes where RegIdx 0 should be used. |
| 748 | SlotIndex Start = ParentI->start; |
| 749 | AssignI.advanceTo(Start); |
| 750 | do { |
| 751 | unsigned RegIdx; |
| 752 | SlotIndex End = ParentI->end; |
| 753 | if (!AssignI.valid()) { |
| 754 | RegIdx = 0; |
| 755 | } else if (AssignI.start() <= Start) { |
| 756 | RegIdx = AssignI.value(); |
| 757 | if (AssignI.stop() < End) { |
| 758 | End = AssignI.stop(); |
| 759 | ++AssignI; |
| 760 | } |
| 761 | } else { |
| 762 | RegIdx = 0; |
| 763 | End = std::min(End, AssignI.start()); |
| 764 | } |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 765 | |
| 766 | // The interval [Start;End) is continuously mapped to RegIdx, ParentVNI. |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 767 | DEBUG(dbgs() << " [" << Start << ';' << End << ")=" << RegIdx); |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 768 | LiveInterval *LI = Edit->get(RegIdx); |
| 769 | |
| 770 | // Check for a simply defined value that can be blitted directly. |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 771 | if (VNInfo *VNI = Values.lookup(std::make_pair(RegIdx, ParentVNI->id))) { |
| 772 | DEBUG(dbgs() << ':' << VNI->id); |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 773 | LI->addRange(LiveRange(Start, End, VNI)); |
| 774 | Start = End; |
| 775 | continue; |
| 776 | } |
| 777 | |
| 778 | // Skip rematerialized values, we need to use extendRange() and |
| 779 | // extendPHIKillRanges() to completely recompute the live ranges. |
| 780 | if (Edit->didRematerialize(ParentVNI)) { |
| 781 | DEBUG(dbgs() << "(remat)"); |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 782 | Skipped = true; |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 783 | Start = End; |
| 784 | continue; |
| 785 | } |
| 786 | |
| 787 | // Initialize the live-out cache the first time it is needed. |
| 788 | if (LiveOutSeen.empty()) { |
| 789 | unsigned N = VRM.getMachineFunction().getNumBlockIDs(); |
| 790 | LiveOutSeen.resize(N); |
| 791 | LiveOutCache.resize(N); |
| 792 | } |
| 793 | |
| 794 | // This value has multiple defs in RegIdx, but it wasn't rematerialized, |
| 795 | // so the live range is accurate. Add live-in blocks in [Start;End) to the |
| 796 | // LiveInBlocks. |
| 797 | MachineFunction::iterator MBB = LIS.getMBBFromIndex(Start); |
| 798 | SlotIndex BlockStart, BlockEnd; |
| 799 | tie(BlockStart, BlockEnd) = LIS.getSlotIndexes()->getMBBRange(MBB); |
| 800 | |
| 801 | // The first block may be live-in, or it may have its own def. |
| 802 | if (Start != BlockStart) { |
| 803 | VNInfo *VNI = LI->extendInBlock(BlockStart, |
| 804 | std::min(BlockEnd, End).getPrevSlot()); |
| 805 | assert(VNI && "Missing def for complex mapped value"); |
| 806 | DEBUG(dbgs() << ':' << VNI->id << "*BB#" << MBB->getNumber()); |
| 807 | // MBB has its own def. Is it also live-out? |
| 808 | if (BlockEnd <= End) { |
| 809 | LiveOutSeen.set(MBB->getNumber()); |
| 810 | LiveOutCache[MBB] = LiveOutPair(VNI, MDT[MBB]); |
| 811 | } |
| 812 | // Skip to the next block for live-in. |
| 813 | ++MBB; |
| 814 | BlockStart = BlockEnd; |
| 815 | } |
| 816 | |
| 817 | // Handle the live-in blocks covered by [Start;End). |
| 818 | assert(Start <= BlockStart && "Expected live-in block"); |
| 819 | while (BlockStart < End) { |
| 820 | DEBUG(dbgs() << ">BB#" << MBB->getNumber()); |
| 821 | BlockEnd = LIS.getMBBEndIdx(MBB); |
| 822 | if (BlockStart == ParentVNI->def) { |
| 823 | // This block has the def of a parent PHI, so it isn't live-in. |
| 824 | assert(ParentVNI->isPHIDef() && "Non-phi defined at block start?"); |
| 825 | VNInfo *VNI = LI->extendInBlock(BlockStart, |
| 826 | std::min(BlockEnd, End).getPrevSlot()); |
| 827 | assert(VNI && "Missing def for complex mapped parent PHI"); |
| 828 | if (End >= BlockEnd) { |
| 829 | // Live-out as well. |
| 830 | LiveOutSeen.set(MBB->getNumber()); |
| 831 | LiveOutCache[MBB] = LiveOutPair(VNI, MDT[MBB]); |
| 832 | } |
| 833 | } else { |
| 834 | // This block needs a live-in value. |
| 835 | LiveInBlocks.push_back(MDT[MBB]); |
| 836 | // The last block covered may not be live-out. |
| 837 | if (End < BlockEnd) |
| 838 | LiveInBlocks.back().Kill = End; |
| 839 | else { |
| 840 | // Live-out, but we need updateSSA to tell us the value. |
| 841 | LiveOutSeen.set(MBB->getNumber()); |
Francois Pichet | cbc5f40 | 2011-04-16 14:20:39 +0000 | [diff] [blame] | 842 | LiveOutCache[MBB] = LiveOutPair((VNInfo*)0, |
| 843 | (MachineDomTreeNode*)0); |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 844 | } |
| 845 | } |
| 846 | BlockStart = BlockEnd; |
| 847 | ++MBB; |
| 848 | } |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 849 | Start = End; |
| 850 | } while (Start != ParentI->end); |
| 851 | DEBUG(dbgs() << '\n'); |
| 852 | } |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 853 | |
| 854 | if (!LiveInBlocks.empty()) |
| 855 | updateSSA(); |
| 856 | |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 857 | return Skipped; |
| 858 | } |
| 859 | |
Jakob Stoklund Olesen | e2dc0c9 | 2011-03-02 23:05:16 +0000 | [diff] [blame] | 860 | void SplitEditor::extendPHIKillRanges() { |
| 861 | // Extend live ranges to be live-out for successor PHI values. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 862 | for (LiveInterval::const_vni_iterator I = Edit->getParent().vni_begin(), |
| 863 | E = Edit->getParent().vni_end(); I != E; ++I) { |
Jakob Stoklund Olesen | e2dc0c9 | 2011-03-02 23:05:16 +0000 | [diff] [blame] | 864 | const VNInfo *PHIVNI = *I; |
| 865 | if (PHIVNI->isUnused() || !PHIVNI->isPHIDef()) |
| 866 | continue; |
| 867 | unsigned RegIdx = RegAssign.lookup(PHIVNI->def); |
| 868 | MachineBasicBlock *MBB = LIS.getMBBFromIndex(PHIVNI->def); |
| 869 | for (MachineBasicBlock::pred_iterator PI = MBB->pred_begin(), |
| 870 | PE = MBB->pred_end(); PI != PE; ++PI) { |
| 871 | SlotIndex End = LIS.getMBBEndIdx(*PI).getPrevSlot(); |
| 872 | // The predecessor may not have a live-out value. That is OK, like an |
| 873 | // undef PHI operand. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 874 | if (Edit->getParent().liveAt(End)) { |
Jakob Stoklund Olesen | e2dc0c9 | 2011-03-02 23:05:16 +0000 | [diff] [blame] | 875 | assert(RegAssign.lookup(End) == RegIdx && |
| 876 | "Different register assignment in phi predecessor"); |
| 877 | extendRange(RegIdx, End); |
| 878 | } |
| 879 | } |
| 880 | } |
| 881 | } |
| 882 | |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 883 | /// rewriteAssigned - Rewrite all uses of Edit->getReg(). |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 884 | void SplitEditor::rewriteAssigned(bool ExtendRanges) { |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 885 | for (MachineRegisterInfo::reg_iterator RI = MRI.reg_begin(Edit->getReg()), |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 886 | RE = MRI.reg_end(); RI != RE;) { |
Jakob Stoklund Olesen | 7466927 | 2010-10-08 23:42:21 +0000 | [diff] [blame] | 887 | MachineOperand &MO = RI.getOperand(); |
| 888 | MachineInstr *MI = MO.getParent(); |
| 889 | ++RI; |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 890 | // LiveDebugVariables should have handled all DBG_VALUE instructions. |
Jakob Stoklund Olesen | 7466927 | 2010-10-08 23:42:21 +0000 | [diff] [blame] | 891 | if (MI->isDebugValue()) { |
| 892 | DEBUG(dbgs() << "Zapping " << *MI); |
Jakob Stoklund Olesen | 7466927 | 2010-10-08 23:42:21 +0000 | [diff] [blame] | 893 | MO.setReg(0); |
| 894 | continue; |
| 895 | } |
Jakob Stoklund Olesen | a372d16 | 2011-02-09 21:52:09 +0000 | [diff] [blame] | 896 | |
| 897 | // <undef> operands don't really read the register, so just assign them to |
| 898 | // the complement. |
| 899 | if (MO.isUse() && MO.isUndef()) { |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 900 | MO.setReg(Edit->get(0)->reg); |
Jakob Stoklund Olesen | a372d16 | 2011-02-09 21:52:09 +0000 | [diff] [blame] | 901 | continue; |
| 902 | } |
| 903 | |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 904 | SlotIndex Idx = LIS.getInstructionIndex(MI); |
Jakob Stoklund Olesen | 7cec179 | 2011-03-18 03:06:02 +0000 | [diff] [blame] | 905 | if (MO.isDef()) |
| 906 | Idx = MO.isEarlyClobber() ? Idx.getUseIndex() : Idx.getDefIndex(); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 907 | |
| 908 | // Rewrite to the mapped register at Idx. |
| 909 | unsigned RegIdx = RegAssign.lookup(Idx); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 910 | MO.setReg(Edit->get(RegIdx)->reg); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 911 | DEBUG(dbgs() << " rewr BB#" << MI->getParent()->getNumber() << '\t' |
| 912 | << Idx << ':' << RegIdx << '\t' << *MI); |
| 913 | |
Jakob Stoklund Olesen | 7cec179 | 2011-03-18 03:06:02 +0000 | [diff] [blame] | 914 | // Extend liveness to Idx if the instruction reads reg. |
| 915 | if (!ExtendRanges) |
| 916 | continue; |
| 917 | |
| 918 | // Skip instructions that don't read Reg. |
| 919 | if (MO.isDef()) { |
| 920 | if (!MO.getSubReg() && !MO.isEarlyClobber()) |
| 921 | continue; |
| 922 | // We may wan't to extend a live range for a partial redef, or for a use |
| 923 | // tied to an early clobber. |
| 924 | Idx = Idx.getPrevSlot(); |
| 925 | if (!Edit->getParent().liveAt(Idx)) |
| 926 | continue; |
| 927 | } else |
| 928 | Idx = Idx.getUseIndex(); |
| 929 | |
| 930 | extendRange(RegIdx, Idx); |
Jakob Stoklund Olesen | 7466927 | 2010-10-08 23:42:21 +0000 | [diff] [blame] | 931 | } |
| 932 | } |
| 933 | |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 934 | void SplitEditor::deleteRematVictims() { |
| 935 | SmallVector<MachineInstr*, 8> Dead; |
Jakob Stoklund Olesen | 2dc455a | 2011-03-20 19:46:23 +0000 | [diff] [blame] | 936 | for (LiveRangeEdit::iterator I = Edit->begin(), E = Edit->end(); I != E; ++I){ |
| 937 | LiveInterval *LI = *I; |
| 938 | for (LiveInterval::const_iterator LII = LI->begin(), LIE = LI->end(); |
| 939 | LII != LIE; ++LII) { |
| 940 | // Dead defs end at the store slot. |
| 941 | if (LII->end != LII->valno->def.getNextSlot()) |
| 942 | continue; |
| 943 | MachineInstr *MI = LIS.getInstructionFromIndex(LII->valno->def); |
| 944 | assert(MI && "Missing instruction for dead def"); |
| 945 | MI->addRegisterDead(LI->reg, &TRI); |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 946 | |
Jakob Stoklund Olesen | 2dc455a | 2011-03-20 19:46:23 +0000 | [diff] [blame] | 947 | if (!MI->allDefsAreDead()) |
| 948 | continue; |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 949 | |
Jakob Stoklund Olesen | 2dc455a | 2011-03-20 19:46:23 +0000 | [diff] [blame] | 950 | DEBUG(dbgs() << "All defs dead: " << *MI); |
| 951 | Dead.push_back(MI); |
| 952 | } |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 953 | } |
| 954 | |
| 955 | if (Dead.empty()) |
| 956 | return; |
| 957 | |
Jakob Stoklund Olesen | 6a3dbd3 | 2011-03-17 20:37:07 +0000 | [diff] [blame] | 958 | Edit->eliminateDeadDefs(Dead, LIS, VRM, TII); |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 959 | } |
| 960 | |
Jakob Stoklund Olesen | 5928046 | 2011-04-21 18:38:15 +0000 | [diff] [blame] | 961 | void SplitEditor::finish(SmallVectorImpl<unsigned> *LRMap) { |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 962 | ++NumFinished; |
Eric Christopher | 463a297 | 2011-02-03 05:40:54 +0000 | [diff] [blame] | 963 | |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 964 | // At this point, the live intervals in Edit contain VNInfos corresponding to |
| 965 | // the inserted copies. |
| 966 | |
| 967 | // Add the original defs from the parent interval. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 968 | for (LiveInterval::const_vni_iterator I = Edit->getParent().vni_begin(), |
| 969 | E = Edit->getParent().vni_end(); I != E; ++I) { |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 970 | const VNInfo *ParentVNI = *I; |
Jakob Stoklund Olesen | 9ecd1e7 | 2011-02-04 00:59:23 +0000 | [diff] [blame] | 971 | if (ParentVNI->isUnused()) |
| 972 | continue; |
Jakob Stoklund Olesen | 670ccd1 | 2011-03-01 23:14:53 +0000 | [diff] [blame] | 973 | unsigned RegIdx = RegAssign.lookup(ParentVNI->def); |
Jakob Stoklund Olesen | 29ef875 | 2011-03-15 21:13:22 +0000 | [diff] [blame] | 974 | VNInfo *VNI = defValue(RegIdx, ParentVNI, ParentVNI->def); |
| 975 | VNI->setIsPHIDef(ParentVNI->isPHIDef()); |
| 976 | VNI->setCopy(ParentVNI->getCopy()); |
| 977 | |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 978 | // Mark rematted values as complex everywhere to force liveness computation. |
| 979 | // The new live ranges may be truncated. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 980 | if (Edit->didRematerialize(ParentVNI)) |
| 981 | for (unsigned i = 0, e = Edit->size(); i != e; ++i) |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 982 | markComplexMapped(i, ParentVNI); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 983 | } |
| 984 | |
| 985 | #ifndef NDEBUG |
| 986 | // Every new interval must have a def by now, otherwise the split is bogus. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 987 | for (LiveRangeEdit::iterator I = Edit->begin(), E = Edit->end(); I != E; ++I) |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 988 | assert((*I)->hasAtLeastOneValue() && "Split interval has no value"); |
| 989 | #endif |
| 990 | |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 991 | // Transfer the simply mapped values, check if any are skipped. |
| 992 | bool Skipped = transferValues(); |
| 993 | if (Skipped) |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 994 | extendPHIKillRanges(); |
| 995 | else |
| 996 | ++NumSimple; |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 997 | |
Jakob Stoklund Olesen | 4670353 | 2011-03-02 23:05:19 +0000 | [diff] [blame] | 998 | // Rewrite virtual registers, possibly extending ranges. |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 999 | rewriteAssigned(Skipped); |
Eric Christopher | 0f43811 | 2011-02-03 06:18:29 +0000 | [diff] [blame] | 1000 | |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 1001 | // Delete defs that were rematted everywhere. |
Jakob Stoklund Olesen | 44b7ae2 | 2011-04-15 17:24:49 +0000 | [diff] [blame] | 1002 | if (Skipped) |
Jakob Stoklund Olesen | 5881799 | 2011-03-08 22:46:11 +0000 | [diff] [blame] | 1003 | deleteRematVictims(); |
Jakob Stoklund Olesen | 5fa42a4 | 2010-09-21 22:32:21 +0000 | [diff] [blame] | 1004 | |
Jakob Stoklund Olesen | 0253df9 | 2010-10-07 23:34:34 +0000 | [diff] [blame] | 1005 | // Get rid of unused values and set phi-kill flags. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 1006 | for (LiveRangeEdit::iterator I = Edit->begin(), E = Edit->end(); I != E; ++I) |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 1007 | (*I)->RenumberValues(LIS); |
Jakob Stoklund Olesen | 5fa42a4 | 2010-09-21 22:32:21 +0000 | [diff] [blame] | 1008 | |
Jakob Stoklund Olesen | 5928046 | 2011-04-21 18:38:15 +0000 | [diff] [blame] | 1009 | // Provide a reverse mapping from original indices to Edit ranges. |
| 1010 | if (LRMap) { |
| 1011 | LRMap->clear(); |
| 1012 | for (unsigned i = 0, e = Edit->size(); i != e; ++i) |
| 1013 | LRMap->push_back(i); |
| 1014 | } |
| 1015 | |
Jakob Stoklund Olesen | 3a0e071 | 2010-10-26 22:36:09 +0000 | [diff] [blame] | 1016 | // Now check if any registers were separated into multiple components. |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 1017 | ConnectedVNInfoEqClasses ConEQ(LIS); |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 1018 | for (unsigned i = 0, e = Edit->size(); i != e; ++i) { |
Jakob Stoklund Olesen | 3a0e071 | 2010-10-26 22:36:09 +0000 | [diff] [blame] | 1019 | // Don't use iterators, they are invalidated by create() below. |
Jakob Stoklund Olesen | a2cae58 | 2011-03-02 23:31:50 +0000 | [diff] [blame] | 1020 | LiveInterval *li = Edit->get(i); |
Jakob Stoklund Olesen | 3a0e071 | 2010-10-26 22:36:09 +0000 | [diff] [blame] | 1021 | unsigned NumComp = ConEQ.Classify(li); |
| 1022 | if (NumComp <= 1) |
| 1023 | continue; |
| 1024 | DEBUG(dbgs() << " " << NumComp << " components: " << *li << '\n'); |
| 1025 | SmallVector<LiveInterval*, 8> dups; |
| 1026 | dups.push_back(li); |
Matt Beaumont-Gay | ae5fbee | 2011-04-21 19:46:23 +0000 | [diff] [blame] | 1027 | for (unsigned j = 1; j != NumComp; ++j) |
Jakob Stoklund Olesen | 6a3dbd3 | 2011-03-17 20:37:07 +0000 | [diff] [blame] | 1028 | dups.push_back(&Edit->create(LIS, VRM)); |
Jakob Stoklund Olesen | 2254227 | 2011-03-17 00:23:45 +0000 | [diff] [blame] | 1029 | ConEQ.Distribute(&dups[0], MRI); |
Jakob Stoklund Olesen | 5928046 | 2011-04-21 18:38:15 +0000 | [diff] [blame] | 1030 | // The new intervals all map back to i. |
| 1031 | if (LRMap) |
| 1032 | LRMap->resize(Edit->size(), i); |
Jakob Stoklund Olesen | 3a0e071 | 2010-10-26 22:36:09 +0000 | [diff] [blame] | 1033 | } |
| 1034 | |
Jakob Stoklund Olesen | 08e93b1 | 2010-08-10 17:07:22 +0000 | [diff] [blame] | 1035 | // Calculate spill weight and allocation hints for new intervals. |
Jakob Stoklund Olesen | 6094bd8 | 2011-03-29 21:20:19 +0000 | [diff] [blame] | 1036 | Edit->calculateRegClassAndHint(VRM.getMachineFunction(), LIS, SA.Loops); |
Jakob Stoklund Olesen | 5928046 | 2011-04-21 18:38:15 +0000 | [diff] [blame] | 1037 | |
| 1038 | assert(!LRMap || LRMap->size() == Edit->size()); |
Jakob Stoklund Olesen | f017900 | 2010-07-26 23:44:11 +0000 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | |
Jakob Stoklund Olesen | 8ae0263 | 2010-07-20 15:41:07 +0000 | [diff] [blame] | 1042 | //===----------------------------------------------------------------------===// |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 1043 | // Single Block Splitting |
| 1044 | //===----------------------------------------------------------------------===// |
| 1045 | |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 1046 | /// getMultiUseBlocks - if CurLI has more than one use in a basic block, it |
| 1047 | /// may be an advantage to split CurLI for the duration of the block. |
Jakob Stoklund Olesen | 2bfb324 | 2010-10-22 22:48:56 +0000 | [diff] [blame] | 1048 | bool SplitAnalysis::getMultiUseBlocks(BlockPtrSet &Blocks) { |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 1049 | // If CurLI is local to one block, there is no point to splitting it. |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 1050 | if (UseBlocks.size() <= 1) |
Jakob Stoklund Olesen | 2bfb324 | 2010-10-22 22:48:56 +0000 | [diff] [blame] | 1051 | return false; |
| 1052 | // Add blocks with multiple uses. |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 1053 | for (unsigned i = 0, e = UseBlocks.size(); i != e; ++i) { |
| 1054 | const BlockInfo &BI = UseBlocks[i]; |
| 1055 | if (BI.FirstUse == BI.LastUse) |
Jakob Stoklund Olesen | 9b05777 | 2011-02-09 23:30:25 +0000 | [diff] [blame] | 1056 | continue; |
| 1057 | Blocks.insert(BI.MBB); |
| 1058 | } |
Jakob Stoklund Olesen | 2bfb324 | 2010-10-22 22:48:56 +0000 | [diff] [blame] | 1059 | return !Blocks.empty(); |
| 1060 | } |
| 1061 | |
Jakob Stoklund Olesen | fd5c513 | 2011-04-12 19:32:53 +0000 | [diff] [blame] | 1062 | void SplitEditor::splitSingleBlock(const SplitAnalysis::BlockInfo &BI) { |
| 1063 | openIntv(); |
| 1064 | SlotIndex LastSplitPoint = SA.getLastSplitPoint(BI.MBB->getNumber()); |
| 1065 | SlotIndex SegStart = enterIntvBefore(std::min(BI.FirstUse, |
| 1066 | LastSplitPoint)); |
| 1067 | if (!BI.LiveOut || BI.LastUse < LastSplitPoint) { |
| 1068 | useIntv(SegStart, leaveIntvAfter(BI.LastUse)); |
| 1069 | } else { |
| 1070 | // The last use is after the last valid split point. |
| 1071 | SlotIndex SegStop = leaveIntvBefore(LastSplitPoint); |
| 1072 | useIntv(SegStart, SegStop); |
| 1073 | overlapIntv(SegStop, BI.LastUse); |
| 1074 | } |
Jakob Stoklund Olesen | fd5c513 | 2011-04-12 19:32:53 +0000 | [diff] [blame] | 1075 | } |
| 1076 | |
Jakob Stoklund Olesen | 0786284 | 2011-01-26 00:50:53 +0000 | [diff] [blame] | 1077 | /// splitSingleBlocks - Split CurLI into a separate live interval inside each |
Jakob Stoklund Olesen | 57d0f2d | 2010-10-05 22:19:33 +0000 | [diff] [blame] | 1078 | /// basic block in Blocks. |
| 1079 | void SplitEditor::splitSingleBlocks(const SplitAnalysis::BlockPtrSet &Blocks) { |
Jakob Stoklund Olesen | e1f543f | 2010-08-12 18:50:55 +0000 | [diff] [blame] | 1080 | DEBUG(dbgs() << " splitSingleBlocks for " << Blocks.size() << " blocks.\n"); |
Jakob Stoklund Olesen | db529a8 | 2011-04-06 03:57:00 +0000 | [diff] [blame] | 1081 | ArrayRef<SplitAnalysis::BlockInfo> UseBlocks = SA.getUseBlocks(); |
| 1082 | for (unsigned i = 0; i != UseBlocks.size(); ++i) { |
| 1083 | const SplitAnalysis::BlockInfo &BI = UseBlocks[i]; |
Jakob Stoklund Olesen | fd5c513 | 2011-04-12 19:32:53 +0000 | [diff] [blame] | 1084 | if (Blocks.count(BI.MBB)) |
| 1085 | splitSingleBlock(BI); |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 1086 | } |
Jakob Stoklund Olesen | 7466927 | 2010-10-08 23:42:21 +0000 | [diff] [blame] | 1087 | finish(); |
Jakob Stoklund Olesen | f1b05f2 | 2010-08-12 17:07:14 +0000 | [diff] [blame] | 1088 | } |