SelectionDAGISel.cpp revision e1f188fe27050ec812e5b64cc996e6bb93300392
11c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===-- SelectionDAGISel.cpp - Implement the SelectionDAGISel class -------===// 2edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman// 31c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// The LLVM Compiler Infrastructure 41c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// 54ee451de366474b9c228b4e5fa573795a715216dChris Lattner// This file is distributed under the University of Illinois Open Source 64ee451de366474b9c228b4e5fa573795a715216dChris Lattner// License. See LICENSE.TXT for details. 7edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman// 81c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 91c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// 101c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// This implements the SelectionDAGISel class. 111c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner// 121c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner//===----------------------------------------------------------------------===// 131c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 141c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#define DEBUG_TYPE "isel" 1584fbac580941548a6ab1121ed3b0ffdc4e2bc080Dan Gohman#include "ScheduleDAGSDNodes.h" 16f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman#include "SelectionDAGBuild.h" 1784fbac580941548a6ab1121ed3b0ffdc4e2bc080Dan Gohman#include "llvm/CodeGen/SelectionDAGISel.h" 18c7c3f110eda0ff8040e4bd99e38d3112b910810fJim Laskey#include "llvm/Analysis/AliasAnalysis.h" 19713f043c16220b746804f668a72f4e0344cbe4d1Devang Patel#include "llvm/Analysis/DebugInfo.h" 205502bf67cd49221583c15472150905ce13184d36Anton Korobeynikov#include "llvm/Constants.h" 21adf6a965a321372c640845407195594835921eb4Chris Lattner#include "llvm/CallingConv.h" 221c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/DerivedTypes.h" 231c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Function.h" 2436ce69195ed488034d0bb11180cc2ebd923679c8Chris Lattner#include "llvm/GlobalVariable.h" 25ce7518ce92f45568dc7d4cbb863284afb962fec5Chris Lattner#include "llvm/InlineAsm.h" 261c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Instructions.h" 271c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Intrinsics.h" 2843970fec322d9e0153ca513de41d80af1c79bddeJim Laskey#include "llvm/IntrinsicInst.h" 2975c478a96a542dc386152e00518441e63d22058dChris Lattner#include "llvm/LLVMContext.h" 3078eca170e9ac5db7fd525f9bbf27090fefcbb646Dan Gohman#include "llvm/CodeGen/FastISel.h" 315a29c9eed157af51a8d338b5a225b146881819e8Gordon Henriksen#include "llvm/CodeGen/GCStrategy.h" 325eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen#include "llvm/CodeGen/GCMetadata.h" 331c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineFunction.h" 34ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohman#include "llvm/CodeGen/MachineFunctionAnalysis.h" 351c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineFrameInfo.h" 361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/MachineInstrBuilder.h" 3784bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include "llvm/CodeGen/MachineJumpTableInfo.h" 3884bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include "llvm/CodeGen/MachineModuleInfo.h" 3984bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner#include "llvm/CodeGen/MachineRegisterInfo.h" 40fc54c552963545a81e4ea38e60460590afb2d5aeDan Gohman#include "llvm/CodeGen/ScheduleHazardRecognizer.h" 41eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey#include "llvm/CodeGen/SchedulerRegistry.h" 421c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/CodeGen/SelectionDAG.h" 436e7a1617ac4a34792d9097b8d3644b72f57a45f7Devang Patel#include "llvm/CodeGen/DwarfWriter.h" 446f0d024a534af18d9e60b3ea757376cd8a3a980eDan Gohman#include "llvm/Target/TargetRegisterInfo.h" 451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetData.h" 461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetFrameInfo.h" 47e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman#include "llvm/Target/TargetIntrinsicInfo.h" 481c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetInstrInfo.h" 491c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetLowering.h" 501c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner#include "llvm/Target/TargetMachine.h" 51124729155d860a0850eb4ef2a7cea4145e13a057Vladimir Prus#include "llvm/Target/TargetOptions.h" 52a4f0b3a084d120cfc5b5bb06f64b222f5cb72740Chris Lattner#include "llvm/Support/Compiler.h" 53db8d56b825efeb576d67b9dbe39d736d93306222Evan Cheng#include "llvm/Support/Debug.h" 547d696d80409aad20bb5da0fc4eccab941dd371d4Torok Edwin#include "llvm/Support/ErrorHandling.h" 55db8d56b825efeb576d67b9dbe39d736d93306222Evan Cheng#include "llvm/Support/MathExtras.h" 56db8d56b825efeb576d67b9dbe39d736d93306222Evan Cheng#include "llvm/Support/Timer.h" 57ce63ffb52f249b62cdf2d250c128007b13f27e71Daniel Dunbar#include "llvm/Support/raw_ostream.h" 587e88103cdea8c36b2229dae8c60def14e3816512Jeff Cohen#include <algorithm> 591c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattnerusing namespace llvm; 601c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 61ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattnerstatic cl::opt<bool> 627cb07874dcadaa9a5082a80959cd15d44ba3a133Duncan SandsDisableLegalizeTypes("disable-legalize-types", cl::Hidden); 6378eca170e9ac5db7fd525f9bbf27090fefcbb646Dan Gohmanstatic cl::opt<bool> 64293d5f8bc02a9148238b2c79484637f56de65b9cDan GohmanEnableFastISelVerbose("fast-isel-verbose", cl::Hidden, 65d659d50482e2f9edf8f436e4a1aa30c68c6d020bDan Gohman cl::desc("Enable verbose messages in the \"fast\" " 66293d5f8bc02a9148238b2c79484637f56de65b9cDan Gohman "instruction selector")); 67293d5f8bc02a9148238b2c79484637f56de65b9cDan Gohmanstatic cl::opt<bool> 684344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan GohmanEnableFastISelAbort("fast-isel-abort", cl::Hidden, 694344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman cl::desc("Enable abort calls when \"fast\" instruction fails")); 708a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohmanstatic cl::opt<bool> 718a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan GohmanSchedLiveInCopies("schedule-livein-copies", 728a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman cl::desc("Schedule copies of livein registers"), 738a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman cl::init(false)); 74ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner 75da8abb02397d7cd62a1e16e7c534edd7096ac873Chris Lattner#ifndef NDEBUG 767944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattnerstatic cl::opt<bool> 77462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan GohmanViewDAGCombine1("view-dag-combine1-dags", cl::Hidden, 78462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman cl::desc("Pop up a window to show dags before the first " 79462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman "dag combine pass")); 80462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohmanstatic cl::opt<bool> 81462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan GohmanViewLegalizeTypesDAGs("view-legalize-types-dags", cl::Hidden, 82462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman cl::desc("Pop up a window to show dags before legalize types")); 83462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohmanstatic cl::opt<bool> 84462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan GohmanViewLegalizeDAGs("view-legalize-dags", cl::Hidden, 85462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman cl::desc("Pop up a window to show dags before legalize")); 86462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohmanstatic cl::opt<bool> 87462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan GohmanViewDAGCombine2("view-dag-combine2-dags", cl::Hidden, 88462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman cl::desc("Pop up a window to show dags before the second " 89462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman "dag combine pass")); 90462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohmanstatic cl::opt<bool> 9125cf2275ff7de3de3bc0e508abaf457413d74725Duncan SandsViewDAGCombineLT("view-dag-combine-lt-dags", cl::Hidden, 9225cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands cl::desc("Pop up a window to show dags before the post legalize types" 9325cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands " dag combine pass")); 9425cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sandsstatic cl::opt<bool> 95a9c2091cd38e401c846391c9951ff416e709b65eEvan ChengViewISelDAGs("view-isel-dags", cl::Hidden, 96a9c2091cd38e401c846391c9951ff416e709b65eEvan Cheng cl::desc("Pop up a window to show isel dags as they are selected")); 97a9c2091cd38e401c846391c9951ff416e709b65eEvan Chengstatic cl::opt<bool> 98a9c2091cd38e401c846391c9951ff416e709b65eEvan ChengViewSchedDAGs("view-sched-dags", cl::Hidden, 99a9c2091cd38e401c846391c9951ff416e709b65eEvan Cheng cl::desc("Pop up a window to show sched dags as they are processed")); 1003e1a7aef17575d9c7058a035449d57e3c7295ed0Dan Gohmanstatic cl::opt<bool> 1013e1a7aef17575d9c7058a035449d57e3c7295ed0Dan GohmanViewSUnitDAGs("view-sunit-dags", cl::Hidden, 1025bab78527a946632cd9614daa0b9a82ee7b5e1ccChris Lattner cl::desc("Pop up a window to show SUnit dags after they are processed")); 1037944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#else 104462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohmanstatic const bool ViewDAGCombine1 = false, 105462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman ViewLegalizeTypesDAGs = false, ViewLegalizeDAGs = false, 106462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman ViewDAGCombine2 = false, 10725cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands ViewDAGCombineLT = false, 108462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman ViewISelDAGs = false, ViewSchedDAGs = false, 109462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman ViewSUnitDAGs = false; 1107944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner#endif 1117944d9d9957db1efe085d9df3ea89826f50029b7Chris Lattner 112eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey//===---------------------------------------------------------------------===// 113eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey/// 114eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey/// RegisterScheduler class - Track the registration of instruction schedulers. 115eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey/// 116eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey//===---------------------------------------------------------------------===// 117eb577ba3b815a1fa4627b060dd2345d17abf672dJim LaskeyMachinePassRegistry RegisterScheduler::Registry; 118eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey 119eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey//===---------------------------------------------------------------------===// 120eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey/// 121eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey/// ISHeuristic command line option for instruction schedulers. 122eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey/// 123eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey//===---------------------------------------------------------------------===// 124844731a7f1909f55935e3514c9e713a62d67662eDan Gohmanstatic cl::opt<RegisterScheduler::FunctionPassCtor, false, 125844731a7f1909f55935e3514c9e713a62d67662eDan Gohman RegisterPassParser<RegisterScheduler> > 126844731a7f1909f55935e3514c9e713a62d67662eDan GohmanISHeuristic("pre-RA-sched", 127844731a7f1909f55935e3514c9e713a62d67662eDan Gohman cl::init(&createDefaultScheduler), 128844731a7f1909f55935e3514c9e713a62d67662eDan Gohman cl::desc("Instruction schedulers available (before register" 129844731a7f1909f55935e3514c9e713a62d67662eDan Gohman " allocation):")); 13013ec702c430b91ee49b9e6d9581cd95412f216c8Jim Laskey 131844731a7f1909f55935e3514c9e713a62d67662eDan Gohmanstatic RegisterScheduler 132b8cab9227a0f6ffbdaae33e3c64268e265008a6aDan GohmandefaultListDAGScheduler("default", "Best scheduler for the target", 133844731a7f1909f55935e3514c9e713a62d67662eDan Gohman createDefaultScheduler); 1344ef10867499aa146cd819c78d8d37a8353d4f0ffEvan Cheng 135f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohmannamespace llvm { 136f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman //===--------------------------------------------------------------------===// 137f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman /// createDefaultScheduler - This creates an instruction scheduler appropriate 138f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman /// for the target. 13947ac0f0c7c39289f5970688154e385be22b7f293Dan Gohman ScheduleDAGSDNodes* createDefaultScheduler(SelectionDAGISel *IS, 14098a366d547772010e94609e4584489b3e5ce0043Bill Wendling CodeGenOpt::Level OptLevel) { 141e9530ecae4897fe8157bd4d7616043bd8c0484e2Dan Gohman const TargetLowering &TLI = IS->getTargetLowering(); 142e9530ecae4897fe8157bd4d7616043bd8c0484e2Dan Gohman 14398a366d547772010e94609e4584489b3e5ce0043Bill Wendling if (OptLevel == CodeGenOpt::None) 144be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling return createFastDAGScheduler(IS, OptLevel); 1459e76fea3abd4229749e6ead46a0016cabff4a056Dan Gohman if (TLI.getSchedulingPreference() == TargetLowering::SchedulingForLatency) 146be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling return createTDListDAGScheduler(IS, OptLevel); 1479e76fea3abd4229749e6ead46a0016cabff4a056Dan Gohman assert(TLI.getSchedulingPreference() == 1489e76fea3abd4229749e6ead46a0016cabff4a056Dan Gohman TargetLowering::SchedulingForRegPressure && "Unknown sched type!"); 149be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling return createBURRListDAGScheduler(IS, OptLevel); 1503a508c94a6c6f124e8b0549358ce76deb92ab662Chris Lattner } 1511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1521c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 153ff9b373e8f5006c629af81e2619778b4c4f5249eEvan Cheng// EmitInstrWithCustomInserter - This method should be implemented by targets 154533297b58da8c74bec65551e1aface9801fc2259Dan Gohman// that mark instructions with the 'usesCustomInserter' flag. These 155025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// instructions are special in various ways, which require special support to 156025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner// insert. The specified MachineInstr is created but not inserted into any 157533297b58da8c74bec65551e1aface9801fc2259Dan Gohman// basic blocks, and this method is called to expand it into a sequence of 158533297b58da8c74bec65551e1aface9801fc2259Dan Gohman// instructions, potentially also creating new basic blocks and control flow. 159533297b58da8c74bec65551e1aface9801fc2259Dan Gohman// When new basic blocks are inserted and the edges from MBB to its successors 160533297b58da8c74bec65551e1aface9801fc2259Dan Gohman// are modified, the method should insert pairs of <OldSucc, NewSucc> into the 161533297b58da8c74bec65551e1aface9801fc2259Dan Gohman// DenseMap. 162ff9b373e8f5006c629af81e2619778b4c4f5249eEvan ChengMachineBasicBlock *TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI, 163fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng MachineBasicBlock *MBB, 164fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) const { 165f36892335b4919b9120e48a792e6b3630b9de978Torok Edwin#ifndef NDEBUG 1664437ae213d5435390f0750213b53ec807c047f22Chris Lattner errs() << "If a target marks an instruction with " 167533297b58da8c74bec65551e1aface9801fc2259Dan Gohman "'usesCustomInserter', it must implement " 168f36892335b4919b9120e48a792e6b3630b9de978Torok Edwin "TargetLowering::EmitInstrWithCustomInserter!"; 169f36892335b4919b9120e48a792e6b3630b9de978Torok Edwin#endif 170c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable(0); 171a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar return 0; 172025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner} 173025c39bf36b6bc2f35a5544338de6cf96fa511a9Chris Lattner 1748a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman/// EmitLiveInCopy - Emit a copy for a live in physical register. If the 1758a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman/// physical register has only a single copy use, then coalesced the copy 1768a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman/// if possible. 1778a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohmanstatic void EmitLiveInCopy(MachineBasicBlock *MBB, 1788a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman MachineBasicBlock::iterator &InsertPos, 1798a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman unsigned VirtReg, unsigned PhysReg, 1808a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetRegisterClass *RC, 1818a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman DenseMap<MachineInstr*, unsigned> &CopyRegMap, 1828a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const MachineRegisterInfo &MRI, 1838a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetRegisterInfo &TRI, 1848a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetInstrInfo &TII) { 1858a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman unsigned NumUses = 0; 1868a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman MachineInstr *UseMI = NULL; 1878a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman for (MachineRegisterInfo::use_iterator UI = MRI.use_begin(VirtReg), 1888a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman UE = MRI.use_end(); UI != UE; ++UI) { 1898a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman UseMI = &*UI; 1908a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (++NumUses > 1) 1918a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman break; 1928a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 1938a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 1948a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // If the number of uses is not one, or the use is not a move instruction, 1958a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // don't coalesce. Also, only coalesce away a virtual register to virtual 1968a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // register copy. 1978a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman bool Coalesced = false; 19804ee5a1d9267e5e6fab8f088095fcb83c3c5cbd1Evan Cheng unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; 1998a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (NumUses == 1 && 20004ee5a1d9267e5e6fab8f088095fcb83c3c5cbd1Evan Cheng TII.isMoveInstr(*UseMI, SrcReg, DstReg, SrcSubReg, DstSubReg) && 2018a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman TargetRegisterInfo::isVirtualRegister(DstReg)) { 2028a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman VirtReg = DstReg; 2038a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman Coalesced = true; 2048a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 2058a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 2068a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // Now find an ideal location to insert the copy. 2078a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman MachineBasicBlock::iterator Pos = InsertPos; 2088a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman while (Pos != MBB->begin()) { 2098a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman MachineInstr *PrevMI = prior(Pos); 2108a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman DenseMap<MachineInstr*, unsigned>::iterator RI = CopyRegMap.find(PrevMI); 2118a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // copyRegToReg might emit multiple instructions to do a copy. 2128a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman unsigned CopyDstReg = (RI == CopyRegMap.end()) ? 0 : RI->second; 2138a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (CopyDstReg && !TRI.regsOverlap(CopyDstReg, PhysReg)) 2148a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // This is what the BB looks like right now: 2158a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // r1024 = mov r0 2168a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // ... 2178a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // r1 = mov r1024 2188a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // 2198a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // We want to insert "r1025 = mov r1". Inserting this copy below the 2208a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // move to r1024 makes it impossible for that move to be coalesced. 2218a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // 2228a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // r1025 = mov r1 2238a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // r1024 = mov r0 2248a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // ... 2258a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // r1 = mov 1024 2268a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // r2 = mov 1025 2278a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman break; // Woot! Found a good location. 2288a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman --Pos; 2298a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 2308a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 231f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin bool Emitted = TII.copyRegToReg(*MBB, Pos, VirtReg, PhysReg, RC, RC); 232f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin assert(Emitted && "Unable to issue a live-in copy instruction!\n"); 233f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin (void) Emitted; 234a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 235931424a7d8b8b15ddda7308d6c5b08277d8bdc0eZhongxing Xu CopyRegMap.insert(std::make_pair(prior(Pos), VirtReg)); 2368a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (Coalesced) { 2378a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (&*InsertPos == UseMI) ++InsertPos; 2388a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman MBB->erase(UseMI); 2398a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 2408a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman} 2418a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 2428a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman/// EmitLiveInCopies - If this is the first basic block in the function, 2438a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman/// and if it has live ins that need to be copied into vregs, emit the 2448a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman/// copies into the block. 2458a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohmanstatic void EmitLiveInCopies(MachineBasicBlock *EntryMBB, 2468a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const MachineRegisterInfo &MRI, 2478a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetRegisterInfo &TRI, 2488a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetInstrInfo &TII) { 2498a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (SchedLiveInCopies) { 2508a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // Emit the copies at a heuristically-determined location in the block. 2518a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman DenseMap<MachineInstr*, unsigned> CopyRegMap; 2528a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman MachineBasicBlock::iterator InsertPos = EntryMBB->begin(); 2538a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman for (MachineRegisterInfo::livein_iterator LI = MRI.livein_begin(), 2548a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman E = MRI.livein_end(); LI != E; ++LI) 2558a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (LI->second) { 2568a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetRegisterClass *RC = MRI.getRegClass(LI->second); 2578a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman EmitLiveInCopy(EntryMBB, InsertPos, LI->second, LI->first, 2588a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman RC, CopyRegMap, MRI, TRI, TII); 2598a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 2608a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } else { 2618a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // Emit the copies into the top of the block. 2628a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman for (MachineRegisterInfo::livein_iterator LI = MRI.livein_begin(), 2638a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman E = MRI.livein_end(); LI != E; ++LI) 2648a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman if (LI->second) { 2658a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetRegisterClass *RC = MRI.getRegClass(LI->second); 266f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin bool Emitted = TII.copyRegToReg(*EntryMBB, EntryMBB->begin(), 267f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin LI->second, LI->first, RC, RC); 268f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin assert(Emitted && "Unable to issue a live-in copy instruction!\n"); 269f1daf7d8abebd6e0104a6b41a774ccbb19a51c60David Goodwin (void) Emitted; 2708a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 2718a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman } 2728a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman} 2738a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 2747041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 2757041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner// SelectionDAGISel code 2767041ee35adecb864e3e8df490aa73b0605fbfb5aChris Lattner//===----------------------------------------------------------------------===// 2771c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 27898a366d547772010e94609e4584489b3e5ce0043Bill WendlingSelectionDAGISel::SelectionDAGISel(TargetMachine &tm, CodeGenOpt::Level OL) : 279ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohman MachineFunctionPass(&ID), TM(tm), TLI(*tm.getTargetLowering()), 2807c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman FuncInfo(new FunctionLoweringInfo(TLI)), 2817c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG(new SelectionDAG(TLI, *FuncInfo)), 282be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling SDL(new SelectionDAGLowering(*CurDAG, TLI, *FuncInfo, OL)), 2837c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman GFI(), 284be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling OptLevel(OL), 2857c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman DAGSize(0) 2867c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman{} 2877c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman 2887c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan GohmanSelectionDAGISel::~SelectionDAGISel() { 2897c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman delete SDL; 2907c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman delete CurDAG; 2917c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman delete FuncInfo; 2927c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman} 2937c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman 294e50ed30282bb5b4a9ed952580523f2dda16215acOwen Andersonunsigned SelectionDAGISel::MakeReg(EVT VT) { 29584bc5427d6883f73cfeae3da640acd011d35c006Chris Lattner return RegInfo->createVirtualRegister(TLI.getRegClassFor(VT)); 2961c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 2971c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 298495a0b51915eb763576874f29192820b731edc22Chris Lattnervoid SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const { 299c7c3f110eda0ff8040e4bd99e38d3112b910810fJim Laskey AU.addRequired<AliasAnalysis>(); 300a3477fe06df794e0eae26ea243f25912c619a6c4Dan Gohman AU.addPreserved<AliasAnalysis>(); 3015eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen AU.addRequired<GCModuleInfo>(); 302a3477fe06df794e0eae26ea243f25912c619a6c4Dan Gohman AU.addPreserved<GCModuleInfo>(); 3036e7a1617ac4a34792d9097b8d3644b72f57a45f7Devang Patel AU.addRequired<DwarfWriter>(); 304a3477fe06df794e0eae26ea243f25912c619a6c4Dan Gohman AU.addPreserved<DwarfWriter>(); 305ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohman MachineFunctionPass::getAnalysisUsage(AU); 306495a0b51915eb763576874f29192820b731edc22Chris Lattner} 3071c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 308ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohmanbool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { 309ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohman Function &Fn = *mf.getFunction(); 310ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohman 3114344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman // Do some sanity-checking on the command-line options. 3124344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman assert((!EnableFastISelVerbose || EnableFastISel) && 3134344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman "-fast-isel-verbose requires -fast-isel"); 3144344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman assert((!EnableFastISelAbort || EnableFastISel) && 3154344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman "-fast-isel-abort requires -fast-isel"); 3164344a5d0d7b280f0b891e0e6a4413b059d9080b3Dan Gohman 3175f43f92c69aae9837064cf08291db1b36a82789fDan Gohman // Get alias analysis for load/store combining. 3185f43f92c69aae9837064cf08291db1b36a82789fDan Gohman AA = &getAnalysis<AliasAnalysis>(); 3195f43f92c69aae9837064cf08291db1b36a82789fDan Gohman 320ad2afc2a421a0e41603d5eee412d4d8c77e9bc1cDan Gohman MF = &mf; 3218a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetInstrInfo &TII = *TM.getInstrInfo(); 3228a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman const TargetRegisterInfo &TRI = *TM.getRegisterInfo(); 3238a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 324f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman if (Fn.hasGC()) 325f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman GFI = &getAnalysis<GCModuleInfo>().getFunctionInfo(Fn); 326ce2247755e56f99a2377b64a1a9d393726582b85Gordon Henriksen else 3275eca075b74d62c621b160aa216b4cd50829a2cc7Gordon Henriksen GFI = 0; 32879ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohman RegInfo = &MF->getRegInfo(); 329ce63ffb52f249b62cdf2d250c128007b13f27e71Daniel Dunbar DEBUG(errs() << "\n\n\n=== " << Fn.getName() << "\n"); 3301c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3311465d61bdd36cfd6021036a527895f0dd358e97dDuncan Sands MachineModuleInfo *MMI = getAnalysisIfAvailable<MachineModuleInfo>(); 3321465d61bdd36cfd6021036a527895f0dd358e97dDuncan Sands DwarfWriter *DW = getAnalysisIfAvailable<DwarfWriter>(); 3335dcaceb0a6a7fcf508d9898547e10d374b0e4cd1Owen Anderson CurDAG->init(*MF, MMI, DW); 334b51d40cf40eac676dda3ae9dfeb55822fa403394Devang Patel FuncInfo->set(Fn, *MF, *CurDAG, EnableFastISel); 3357c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->init(GFI, *AA); 3361c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 3371532f3ddd77c362dd5f613af06b4de636e3c5b0eDale Johannesen for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) 3381532f3ddd77c362dd5f613af06b4de636e3c5b0eDale Johannesen if (InvokeInst *Invoke = dyn_cast<InvokeInst>(I->getTerminator())) 3391532f3ddd77c362dd5f613af06b4de636e3c5b0eDale Johannesen // Mark landing pad. 3407c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman FuncInfo->MBBMap[Invoke->getSuccessor(1)]->setIsLandingPad(); 3419fac0b5ff24e733072bdde68c7f34590c1892922Duncan Sands 34279ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohman SelectAllBasicBlocks(Fn, *MF, MMI, DW, TII); 343edf128a7fa90f2b0b7ee24741a04a7ae1ecd6f7eMisha Brukman 3448a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // If the first basic block in the function has live ins that need to be 3458a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // copied into vregs, emit the copies into the top of the block before 3468a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman // emitting the code for the block. 34779ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohman EmitLiveInCopies(MF->begin(), *RegInfo, TRI, TII); 3488a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman 349ad2070c667ebabf1650be63e6b3e0b411da86918Evan Cheng // Add function live-ins to entry block live-in set. 3508a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman for (MachineRegisterInfo::livein_iterator I = RegInfo->livein_begin(), 3518a11053f3ca7efb29312c4293c4fdb5d2ca3e20fDan Gohman E = RegInfo->livein_end(); I != E; ++I) 35279ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohman MF->begin()->addLiveIn(I->first); 353ad2070c667ebabf1650be63e6b3e0b411da86918Evan Cheng 354f40708223e409a152834b1553c6883ff2035b957Duncan Sands#ifndef NDEBUG 3557c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman assert(FuncInfo->CatchInfoFound.size() == FuncInfo->CatchInfoLost.size() && 356f40708223e409a152834b1553c6883ff2035b957Duncan Sands "Not all catch info was assigned to a landing pad!"); 357f40708223e409a152834b1553c6883ff2035b957Duncan Sands#endif 358f40708223e409a152834b1553c6883ff2035b957Duncan Sands 3597c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman FuncInfo->clear(); 3607c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman 3611c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner return true; 3621c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 3631c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 364f40708223e409a152834b1553c6883ff2035b957Duncan Sandsstatic void copyCatchInfo(BasicBlock *SrcBB, BasicBlock *DestBB, 365f40708223e409a152834b1553c6883ff2035b957Duncan Sands MachineModuleInfo *MMI, FunctionLoweringInfo &FLI) { 366f40708223e409a152834b1553c6883ff2035b957Duncan Sands for (BasicBlock::iterator I = SrcBB->begin(), E = --SrcBB->end(); I != E; ++I) 367f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman if (EHSelectorInst *EHSel = dyn_cast<EHSelectorInst>(I)) { 368f40708223e409a152834b1553c6883ff2035b957Duncan Sands // Apply the catch info to DestBB. 369f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman AddCatchInfo(*EHSel, MMI, FLI.MBBMap[DestBB]); 370f40708223e409a152834b1553c6883ff2035b957Duncan Sands#ifndef NDEBUG 371560a737e073788463b9275c5e92ebc12f0ea62a2Duncan Sands if (!FLI.MBBMap[SrcBB]->isLandingPad()) 372f0cbcd48804961b05359ee41859bbd7774f41fe0Dan Gohman FLI.CatchInfoFound.insert(EHSel); 373f40708223e409a152834b1553c6883ff2035b957Duncan Sands#endif 374f40708223e409a152834b1553c6883ff2035b957Duncan Sands } 375f40708223e409a152834b1553c6883ff2035b957Duncan Sands} 376f40708223e409a152834b1553c6883ff2035b957Duncan Sands 377f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohmanvoid SelectionDAGISel::SelectBasicBlock(BasicBlock *LLVMBB, 378f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman BasicBlock::iterator Begin, 3795edd361497f4c78a20fcbb75c6e7e94ff8046ed1Dan Gohman BasicBlock::iterator End) { 3807c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->setCurrentBasicBlock(BB); 381e30e678865b8dc1b69ef1c26e7567ffd1300553cDevang Patel MetadataContext &TheMetadata = LLVMBB->getParent()->getContext().getMetadata(); 382a2148402ce39fb3aad09e98a32078d3853a01ae9Devang Patel unsigned MDDbgKind = TheMetadata.getMDKind("dbg"); 383f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 38498ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman // Lower all of the non-terminator instructions. If a call is emitted 38598ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman // as a tail call, cease emitting nodes for this block. 386123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel for (BasicBlock::iterator I = Begin; I != End && !SDL->HasTailCall; ++I) { 387123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel if (MDDbgKind) { 388a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar // Update DebugLoc if debug information is attached with this 389123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel // instruction. 3909dddf9748025cb65a951e6807bc156cf5bcd046dDevang Patel if (MDNode *Dbg = TheMetadata.getMD(MDDbgKind, I)) { 391a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar DILocation DILoc(Dbg); 392a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar DebugLoc Loc = ExtractDebugLocation(DILoc, MF->getDebugLocInfo()); 393a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar SDL->setCurDebugLoc(Loc); 3941f03471a2dfb02fa39f7168244bb8c0891a56ab9Devang Patel if (MF->getDefaultDebugLoc().isUnknown()) 3951f03471a2dfb02fa39f7168244bb8c0891a56ab9Devang Patel MF->setDefaultDebugLoc(Loc); 396123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel } 397123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel } 398f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (!isa<TerminatorInst>(I)) 3997c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visit(*I); 400123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel } 401f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 40298ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman if (!SDL->HasTailCall) { 40398ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman // Ensure that all instructions which are used outside of their defining 40498ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman // blocks are available as virtual registers. Invoke is handled elsewhere. 40598ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman for (BasicBlock::iterator I = Begin; I != End; ++I) 40698ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman if (!isa<PHINode>(I) && !isa<InvokeInst>(I)) 40798ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman SDL->CopyToExportRegsIfNeeded(I); 408f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 40998ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman // Handle PHI nodes in successor blocks. 41098ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman if (End == LLVMBB->end()) { 41198ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman HandlePHINodesInSuccessorBlocks(LLVMBB); 4123df24e667f04a7003342b534310919abc9c87418Dan Gohman 41398ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman // Lower the terminator after the copies are emitted. 41498ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman SDL->visit(*LLVMBB->getTerminator()); 41598ca4f2a325f72374a477f9deba7d09e8999c29bDan Gohman } 4163df24e667f04a7003342b534310919abc9c87418Dan Gohman } 417a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 418a651cf67b77cd477dd7da4baa8688af2ccd4f7f6Chris Lattner // Make sure the root of the DAG is up-to-date. 4197c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG->setRoot(SDL->getControlRoot()); 420c85e1716f0e45e4c18a9ef2fbe431a51ac3a4252Arnold Schwaighofer 421f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman // Final step, emit the lowered DAG as machine code. 422f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CodeGenAndEmitDAG(); 4237c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->clear(); 4241c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 4251c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 426f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohmanvoid SelectionDAGISel::ComputeLiveOutVRegInfo() { 427ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner SmallPtrSet<SDNode*, 128> VisitedNodes; 428ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner SmallVector<SDNode*, 128> Worklist; 429a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 430ba36cb5242eb02b12b277f82b9efe497f7da4d7fGabor Greif Worklist.push_back(CurDAG->getRoot().getNode()); 431a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 432ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner APInt Mask; 433ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner APInt KnownZero; 434ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner APInt KnownOne; 435a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 436ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner while (!Worklist.empty()) { 437ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner SDNode *N = Worklist.back(); 438ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner Worklist.pop_back(); 439a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 440ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner // If we've already seen this node, ignore it. 441ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner if (!VisitedNodes.insert(N)) 442ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner continue; 443a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 444ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner // Otherwise, add all chain operands to the worklist. 445ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) 446825b72b0571821bf2d378749f69d6c4cfb52d2f9Owen Anderson if (N->getOperand(i).getValueType() == MVT::Other) 447ba36cb5242eb02b12b277f82b9efe497f7da4d7fGabor Greif Worklist.push_back(N->getOperand(i).getNode()); 448a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 449ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner // If this is a CopyToReg with a vreg dest, process it. 450ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner if (N->getOpcode() != ISD::CopyToReg) 451ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner continue; 452a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 453ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner unsigned DestReg = cast<RegisterSDNode>(N->getOperand(1))->getReg(); 454ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner if (!TargetRegisterInfo::isVirtualRegister(DestReg)) 455ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner continue; 456a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 457ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner // Ignore non-scalar or non-integer values. 458475871a144eb604ddaf37503397ba0941442e5fbDan Gohman SDValue Src = N->getOperand(2); 459e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson EVT SrcVT = Src.getValueType(); 460ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner if (!SrcVT.isInteger() || SrcVT.isVector()) 461ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner continue; 462a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 463f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman unsigned NumSignBits = CurDAG->ComputeNumSignBits(Src); 464ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner Mask = APInt::getAllOnesValue(SrcVT.getSizeInBits()); 465f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CurDAG->ComputeMaskedBits(Src, Mask, KnownZero, KnownOne); 466a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 467ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner // Only install this information if it tells us something. 468ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner if (NumSignBits != 1 || KnownZero != 0 || KnownOne != 0) { 469ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner DestReg -= TargetRegisterInfo::FirstVirtualRegister; 470f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman if (DestReg >= FuncInfo->LiveOutRegInfo.size()) 471f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman FuncInfo->LiveOutRegInfo.resize(DestReg+1); 472f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman FunctionLoweringInfo::LiveOutInfo &LOI = 473f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman FuncInfo->LiveOutRegInfo[DestReg]; 474ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner LOI.NumSignBits = NumSignBits; 475a80efceb93211a22e13dfc68198da4a25c1a7762Dan Gohman LOI.KnownOne = KnownOne; 476a80efceb93211a22e13dfc68198da4a25c1a7762Dan Gohman LOI.KnownZero = KnownZero; 477ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner } 478ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner } 479ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner} 480ead0d88ad7659dabd66cc3149af97d98256fca84Chris Lattner 481f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohmanvoid SelectionDAGISel::CodeGenAndEmitDAG() { 482462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman std::string GroupName; 483462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman if (TimePassesIsEnabled) 484462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman GroupName = "Instruction Selection and Scheduling"; 485462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman std::string BlockName; 486462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman if (ViewDAGCombine1 || ViewLegalizeTypesDAGs || ViewLegalizeDAGs || 48725cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands ViewDAGCombine2 || ViewDAGCombineLT || ViewISelDAGs || ViewSchedDAGs || 48825cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands ViewSUnitDAGs) 489f7d6cd46e920776bb33913b2498347cf99358dc4Dan Gohman BlockName = MF->getFunction()->getNameStr() + ":" + 490f6ccee5a9d2b9573f679bca6266ade3eb8cd3f88Daniel Dunbar BB->getBasicBlock()->getNameStr(); 491462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 492bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Initial selection DAG:\n"); 493f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(CurDAG->dump()); 494462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 495f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (ViewDAGCombine1) CurDAG->viewGraph("dag-combine1 input for " + BlockName); 496417e11b9bf625b3626f8765d44248927fb200906Dan Gohman 497af21d55aee8d6852fedfd630395a3c7c95df8f12Chris Lattner // Run the DAG combiner in pre-legalize mode. 498ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng if (TimePassesIsEnabled) { 4995e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("DAG Combining 1", GroupName); 500be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Combine(Unrestricted, *AA, OptLevel); 501ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } else { 502be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Combine(Unrestricted, *AA, OptLevel); 503ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } 504a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 505bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Optimized lowered selection DAG:\n"); 506f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(CurDAG->dump()); 507a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 5081c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // Second step, hack on the DAG until it only uses operations and types that 5091c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // the target supports. 5107cb07874dcadaa9a5082a80959cd15d44ba3a133Duncan Sands if (!DisableLegalizeTypes) { 511f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (ViewLegalizeTypesDAGs) CurDAG->viewGraph("legalize-types input for " + 512f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman BlockName); 513462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 51425cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands bool Changed; 515462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman if (TimePassesIsEnabled) { 516462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman NamedRegionTimer T("Type Legalization", GroupName); 51725cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands Changed = CurDAG->LegalizeTypes(); 518462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman } else { 51925cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands Changed = CurDAG->LegalizeTypes(); 520462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman } 521462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 522bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Type-legalized selection DAG:\n"); 523f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(CurDAG->dump()); 524462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 52525cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands if (Changed) { 52625cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands if (ViewDAGCombineLT) 52725cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands CurDAG->viewGraph("dag-combine-lt input for " + BlockName); 52825cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands 52925cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands // Run the DAG combiner in post-type-legalize mode. 53025cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands if (TimePassesIsEnabled) { 53125cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands NamedRegionTimer T("DAG Combining after legalize types", GroupName); 532be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Combine(NoIllegalTypes, *AA, OptLevel); 53325cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands } else { 534be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Combine(NoIllegalTypes, *AA, OptLevel); 53525cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands } 53625cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands 537bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Optimized type-legalized selection DAG:\n"); 53825cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands DEBUG(CurDAG->dump()); 53925cf2275ff7de3de3bc0e508abaf457413d74725Duncan Sands } 5405c22c8074404797f1313b1334757254fb5c6487aEli Friedman 5415c22c8074404797f1313b1334757254fb5c6487aEli Friedman if (TimePassesIsEnabled) { 5425c22c8074404797f1313b1334757254fb5c6487aEli Friedman NamedRegionTimer T("Vector Legalization", GroupName); 5435c22c8074404797f1313b1334757254fb5c6487aEli Friedman Changed = CurDAG->LegalizeVectors(); 5445c22c8074404797f1313b1334757254fb5c6487aEli Friedman } else { 5455c22c8074404797f1313b1334757254fb5c6487aEli Friedman Changed = CurDAG->LegalizeVectors(); 5465c22c8074404797f1313b1334757254fb5c6487aEli Friedman } 5475c22c8074404797f1313b1334757254fb5c6487aEli Friedman 5485c22c8074404797f1313b1334757254fb5c6487aEli Friedman if (Changed) { 5495c22c8074404797f1313b1334757254fb5c6487aEli Friedman if (TimePassesIsEnabled) { 5505c22c8074404797f1313b1334757254fb5c6487aEli Friedman NamedRegionTimer T("Type Legalization 2", GroupName); 5515c22c8074404797f1313b1334757254fb5c6487aEli Friedman Changed = CurDAG->LegalizeTypes(); 5525c22c8074404797f1313b1334757254fb5c6487aEli Friedman } else { 5535c22c8074404797f1313b1334757254fb5c6487aEli Friedman Changed = CurDAG->LegalizeTypes(); 5545c22c8074404797f1313b1334757254fb5c6487aEli Friedman } 5555c22c8074404797f1313b1334757254fb5c6487aEli Friedman 5565c22c8074404797f1313b1334757254fb5c6487aEli Friedman if (ViewDAGCombineLT) 5575c22c8074404797f1313b1334757254fb5c6487aEli Friedman CurDAG->viewGraph("dag-combine-lv input for " + BlockName); 5585c22c8074404797f1313b1334757254fb5c6487aEli Friedman 5595c22c8074404797f1313b1334757254fb5c6487aEli Friedman // Run the DAG combiner in post-type-legalize mode. 5605c22c8074404797f1313b1334757254fb5c6487aEli Friedman if (TimePassesIsEnabled) { 5615c22c8074404797f1313b1334757254fb5c6487aEli Friedman NamedRegionTimer T("DAG Combining after legalize vectors", GroupName); 5625c22c8074404797f1313b1334757254fb5c6487aEli Friedman CurDAG->Combine(NoIllegalOperations, *AA, OptLevel); 5635c22c8074404797f1313b1334757254fb5c6487aEli Friedman } else { 5645c22c8074404797f1313b1334757254fb5c6487aEli Friedman CurDAG->Combine(NoIllegalOperations, *AA, OptLevel); 5655c22c8074404797f1313b1334757254fb5c6487aEli Friedman } 5665c22c8074404797f1313b1334757254fb5c6487aEli Friedman 567bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Optimized vector-legalized selection DAG:\n"); 5685c22c8074404797f1313b1334757254fb5c6487aEli Friedman DEBUG(CurDAG->dump()); 5695c22c8074404797f1313b1334757254fb5c6487aEli Friedman } 57070587ea813986bb0dbef71610091d496e28c22a6Chris Lattner } 571a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 572f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (ViewLegalizeDAGs) CurDAG->viewGraph("legalize input for " + BlockName); 573462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 574ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng if (TimePassesIsEnabled) { 5755e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("DAG Legalization", GroupName); 576be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Legalize(DisableLegalizeTypes, OptLevel); 577ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } else { 578be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Legalize(DisableLegalizeTypes, OptLevel); 579ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } 580a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 581bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Legalized selection DAG:\n"); 582f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(CurDAG->dump()); 583a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 584f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (ViewDAGCombine2) CurDAG->viewGraph("dag-combine2 input for " + BlockName); 585462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 586af21d55aee8d6852fedfd630395a3c7c95df8f12Chris Lattner // Run the DAG combiner in post-legalize mode. 587ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng if (TimePassesIsEnabled) { 5885e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("DAG Combining 2", GroupName); 589be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Combine(NoIllegalOperations, *AA, OptLevel); 590ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } else { 591be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling CurDAG->Combine(NoIllegalOperations, *AA, OptLevel); 592ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } 593a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 594bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Optimized legalized selection DAG:\n"); 595f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(CurDAG->dump()); 596417e11b9bf625b3626f8765d44248927fb200906Dan Gohman 597f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (ViewISelDAGs) CurDAG->viewGraph("isel input for " + BlockName); 598a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 59998a366d547772010e94609e4584489b3e5ce0043Bill Wendling if (OptLevel != CodeGenOpt::None) 600f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman ComputeLiveOutVRegInfo(); 601552c4a849422ad91fa9988255ae35aebbf3acf7bEvan Cheng 602a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Third, instruction select all of the operations to machine code, adding the 603a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // code to the MachineBasicBlock. 604ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng if (TimePassesIsEnabled) { 6055e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("Instruction Selection", GroupName); 606f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman InstructionSelect(); 607ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } else { 608f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman InstructionSelect(); 609ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } 610db8d56b825efeb576d67b9dbe39d736d93306222Evan Cheng 611bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Selected selection DAG:\n"); 612f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(CurDAG->dump()); 613462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 614f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (ViewSchedDAGs) CurDAG->viewGraph("scheduler input for " + BlockName); 615462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 6165e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman // Schedule machine code. 61747ac0f0c7c39289f5970688154e385be22b7f293Dan Gohman ScheduleDAGSDNodes *Scheduler = CreateScheduler(); 6185e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman if (TimePassesIsEnabled) { 6195e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("Instruction Scheduling", GroupName); 62047ac0f0c7c39289f5970688154e385be22b7f293Dan Gohman Scheduler->Run(CurDAG, BB, BB->end()); 6215e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman } else { 62247ac0f0c7c39289f5970688154e385be22b7f293Dan Gohman Scheduler->Run(CurDAG, BB, BB->end()); 6235e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman } 6245e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman 625462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman if (ViewSUnitDAGs) Scheduler->viewGraph(); 626462dc7f4960e5074ddf4769ec8b2ef1ba7a4d2c8Dan Gohman 627a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar // Emit machine code to BB. This can change 'BB' to the last block being 628db8d56b825efeb576d67b9dbe39d736d93306222Evan Cheng // inserted into. 629ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng if (TimePassesIsEnabled) { 6305e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("Instruction Creation", GroupName); 631fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng BB = Scheduler->EmitSchedule(&SDL->EdgeMapping); 632ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } else { 633fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng BB = Scheduler->EmitSchedule(&SDL->EdgeMapping); 6345e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman } 6355e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman 6365e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman // Free the scheduler state. 6375e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman if (TimePassesIsEnabled) { 6385e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman NamedRegionTimer T("Instruction Scheduling Cleanup", GroupName); 6395e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman delete Scheduler; 6405e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman } else { 6415e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman delete Scheduler; 642ebffb660a68384dd8b5e2ff36d68e94a3920611bEvan Cheng } 643db8d56b825efeb576d67b9dbe39d736d93306222Evan Cheng 644bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Selected machine code:\n"); 6451c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner DEBUG(BB->dump()); 646a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar} 647f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman 64879ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohmanvoid SelectionDAGISel::SelectAllBasicBlocks(Function &Fn, 64979ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohman MachineFunction &MF, 650dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman MachineModuleInfo *MMI, 65183489bb7700c69b7a4a8da59365c42d3f5c8129bDevang Patel DwarfWriter *DW, 652dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman const TargetInstrInfo &TII) { 653a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Initialize the Fast-ISel state, if needed. 654a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman FastISel *FastIS = 0; 655a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (EnableFastISel) 65679ce276083ced01256a0eb7d80731e4948ca6e87Dan Gohman FastIS = TLI.createFastISel(MF, MMI, DW, 657a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman FuncInfo->ValueMap, 658a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman FuncInfo->MBBMap, 659dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman FuncInfo->StaticAllocaMap 660dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman#ifndef NDEBUG 661dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman , FuncInfo->CatchInfoLost 662dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman#endif 663dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman ); 664a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman 665e30e678865b8dc1b69ef1c26e7567ffd1300553cDevang Patel MetadataContext &TheMetadata = Fn.getContext().getMetadata(); 666a2148402ce39fb3aad09e98a32078d3853a01ae9Devang Patel unsigned MDDbgKind = TheMetadata.getMDKind("dbg"); 667123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel 668a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Iterate over all basic blocks in the function. 66939fd6e81b1b0de8b820155dc6a0dae226c109de6Evan Cheng for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I) { 67039fd6e81b1b0de8b820155dc6a0dae226c109de6Evan Cheng BasicBlock *LLVMBB = &*I; 6717c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman BB = FuncInfo->MBBMap[LLVMBB]; 672f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 6733df24e667f04a7003342b534310919abc9c87418Dan Gohman BasicBlock::iterator const Begin = LLVMBB->begin(); 6743df24e667f04a7003342b534310919abc9c87418Dan Gohman BasicBlock::iterator const End = LLVMBB->end(); 6759f1185076d60153fd35feb3cadb1b4cd8debc0b6Evan Cheng BasicBlock::iterator BI = Begin; 6765edd361497f4c78a20fcbb75c6e7e94ff8046ed1Dan Gohman 6775edd361497f4c78a20fcbb75c6e7e94ff8046ed1Dan Gohman // Lower any arguments needed in this block if this is the entry block. 67833134c4a75558288d663267c8991f6bd37a530afDan Gohman bool SuppressFastISel = false; 67933134c4a75558288d663267c8991f6bd37a530afDan Gohman if (LLVMBB == &Fn.getEntryBlock()) { 6805edd361497f4c78a20fcbb75c6e7e94ff8046ed1Dan Gohman LowerArguments(LLVMBB); 681f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 68233134c4a75558288d663267c8991f6bd37a530afDan Gohman // If any of the arguments has the byval attribute, forgo 68333134c4a75558288d663267c8991f6bd37a530afDan Gohman // fast-isel in the entry block. 684a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (FastIS) { 68533134c4a75558288d663267c8991f6bd37a530afDan Gohman unsigned j = 1; 68633134c4a75558288d663267c8991f6bd37a530afDan Gohman for (Function::arg_iterator I = Fn.arg_begin(), E = Fn.arg_end(); 68733134c4a75558288d663267c8991f6bd37a530afDan Gohman I != E; ++I, ++j) 6880598866c052147c31b808391f58434ce3dbfb838Devang Patel if (Fn.paramHasAttr(j, Attribute::ByVal)) { 68977ca41e5c3f99ee8962b21a7d90bb251a594a65eDan Gohman if (EnableFastISelVerbose || EnableFastISelAbort) 6904437ae213d5435390f0750213b53ec807c047f22Chris Lattner errs() << "FastISel skips entry block due to byval argument\n"; 69133134c4a75558288d663267c8991f6bd37a530afDan Gohman SuppressFastISel = true; 69233134c4a75558288d663267c8991f6bd37a530afDan Gohman break; 69333134c4a75558288d663267c8991f6bd37a530afDan Gohman } 69433134c4a75558288d663267c8991f6bd37a530afDan Gohman } 69533134c4a75558288d663267c8991f6bd37a530afDan Gohman } 69633134c4a75558288d663267c8991f6bd37a530afDan Gohman 697dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (MMI && BB->isLandingPad()) { 698dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // Add a label to mark the beginning of the landing pad. Deletion of the 699dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // landing pad can thus be detected via the MachineModuleInfo. 700dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman unsigned LabelID = MMI->addLandingPad(BB); 701dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 702dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman const TargetInstrDesc &II = TII.get(TargetInstrInfo::EH_LABEL); 703b288487a8e2291dd802e19b1a9bc930368f448bfBill Wendling BuildMI(BB, SDL->getCurDebugLoc(), II).addImm(LabelID); 704dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 705dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // Mark exception register as live in. 706dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman unsigned Reg = TLI.getExceptionAddressRegister(); 707dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (Reg) BB->addLiveIn(Reg); 708dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 709dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // Mark exception selector register as live in. 710dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman Reg = TLI.getExceptionSelectorRegister(); 711dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (Reg) BB->addLiveIn(Reg); 712dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 713dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // FIXME: Hack around an exception handling flaw (PR1508): the personality 714dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // function and list of typeids logically belong to the invoke (or, if you 715dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // like, the basic block containing the invoke), and need to be associated 716dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // with it in the dwarf exception handling tables. Currently however the 717dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // information is provided by an intrinsic (eh.selector) that can be moved 718dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // to unexpected places by the optimizers: if the unwind edge is critical, 719dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // then breaking it can result in the intrinsics being in the successor of 720dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // the landing pad, not the landing pad itself. This results in exceptions 721dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // not being caught because no typeids are associated with the invoke. 722dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // This may not be the only way things can go wrong, but it is the only way 723dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // we try to work around for the moment. 724dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman BranchInst *Br = dyn_cast<BranchInst>(LLVMBB->getTerminator()); 725dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 726dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (Br && Br->isUnconditional()) { // Critical edge? 727dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman BasicBlock::iterator I, E; 728dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman for (I = LLVMBB->begin(), E = --LLVMBB->end(); I != E; ++I) 729dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (isa<EHSelectorInst>(I)) 730dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman break; 731dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 732dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (I == E) 733dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman // No catch info found - try to extract some from the successor. 734dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman copyCatchInfo(Br->getSuccessor(0), LLVMBB, MMI, *FuncInfo); 735dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman } 736dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman } 737dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman 738f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman // Before doing SelectionDAG ISel, see if FastISel has been requested. 739dd5b58ad7be78be90390074f0df138778af5c895Dan Gohman if (FastIS && !SuppressFastISel) { 740a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Emit code for any incoming arguments. This must happen before 741a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // beginning FastISel on the entry block. 742a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (LLVMBB == &Fn.getEntryBlock()) { 743a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman CurDAG->setRoot(SDL->getControlRoot()); 744a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman CodeGenAndEmitDAG(); 745a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman SDL->clear(); 746a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman } 747241f464d24a6c22721607841069bbeb17b3f71e6Dan Gohman FastIS->startNewBlock(BB); 748a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Do FastISel on as many instructions as possible. 749a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman for (; BI != End; ++BI) { 750a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar if (MDDbgKind) { 751a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar // Update DebugLoc if debug information is attached with this 752a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar // instruction. 7539dddf9748025cb65a951e6807bc156cf5bcd046dDevang Patel if (MDNode *Dbg = TheMetadata.getMD(MDDbgKind, BI)) { 754a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar DILocation DILoc(Dbg); 755a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar DebugLoc Loc = ExtractDebugLocation(DILoc, 756a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar MF.getDebugLocInfo()); 757a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar FastIS->setCurDebugLoc(Loc); 758454e957979727bd29d75ec70623e50795f5824d9Devang Patel if (MF.getDefaultDebugLoc().isUnknown()) 759454e957979727bd29d75ec70623e50795f5824d9Devang Patel MF.setDefaultDebugLoc(Loc); 760a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar } 761a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar } 762123eaa71b50f5ac2ea2233685baedddbb72f387bDevang Patel 763a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Just before the terminator instruction, insert instructions to 764a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // feed PHI nodes in successor blocks. 765a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (isa<TerminatorInst>(BI)) 766a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (!HandlePHINodesInSuccessorBlocksFast(LLVMBB, FastIS)) { 76777ca41e5c3f99ee8962b21a7d90bb251a594a65eDan Gohman if (EnableFastISelVerbose || EnableFastISelAbort) { 7684437ae213d5435390f0750213b53ec807c047f22Chris Lattner errs() << "FastISel miss: "; 76977ca41e5c3f99ee8962b21a7d90bb251a594a65eDan Gohman BI->dump(); 77077ca41e5c3f99ee8962b21a7d90bb251a594a65eDan Gohman } 771a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar assert(!EnableFastISelAbort && 772f36892335b4919b9120e48a792e6b3630b9de978Torok Edwin "FastISel didn't handle a PHI in a successor"); 773a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman break; 774a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman } 77533134c4a75558288d663267c8991f6bd37a530afDan Gohman 776a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // First try normal tablegen-generated "fast" selection. 777a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (FastIS->SelectInstruction(BI)) 778a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman continue; 779a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman 780a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Next, try calling the target to attempt to handle the instruction. 781a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (FastIS->TargetSelectInstruction(BI)) 782a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman continue; 783f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 784a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Then handle certain instructions as single-LLVM-Instruction blocks. 785a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (isa<CallInst>(BI)) { 786a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (EnableFastISelVerbose || EnableFastISelAbort) { 7874437ae213d5435390f0750213b53ec807c047f22Chris Lattner errs() << "FastISel missed call: "; 788a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman BI->dump(); 789f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman } 790f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 7911d0be15f89cb5056e20e2d24faa8d6afb1573bcaOwen Anderson if (BI->getType() != Type::getVoidTy(*CurDAG->getContext())) { 792a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman unsigned &R = FuncInfo->ValueMap[BI]; 793a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (!R) 794a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman R = FuncInfo->CreateRegForValue(BI); 795f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman } 796a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman 797390f3ace34855a3d4c9e0adf468976375f8c6dc1Devang Patel SDL->setCurDebugLoc(FastIS->getCurDebugLoc()); 798a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman SelectBasicBlock(LLVMBB, BI, next(BI)); 799241f464d24a6c22721607841069bbeb17b3f71e6Dan Gohman // If the instruction was codegen'd with multiple blocks, 800241f464d24a6c22721607841069bbeb17b3f71e6Dan Gohman // inform the FastISel object where to resume inserting. 801241f464d24a6c22721607841069bbeb17b3f71e6Dan Gohman FastIS->setCurrentBlock(BB); 802a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman continue; 803f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman } 804a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman 805a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // Otherwise, give up on FastISel for the rest of the block. 806a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // For now, be a little lenient about non-branch terminators. 807a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (!isa<TerminatorInst>(BI) || isa<BranchInst>(BI)) { 808a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (EnableFastISelVerbose || EnableFastISelAbort) { 8094437ae213d5435390f0750213b53ec807c047f22Chris Lattner errs() << "FastISel miss: "; 810a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman BI->dump(); 811a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman } 812a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman if (EnableFastISelAbort) 813a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // The "fast" selector couldn't handle something and bailed. 814a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman // For the purpose of debugging, just abort. 815c23197a26f34f559ea9797de51e187087c039c42Torok Edwin llvm_unreachable("FastISel didn't select the entire block"); 816a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman } 817a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman break; 818f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman } 819f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman } 820f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman 821d2ff647964ed242e67ac12f7d21a58c864309d95Dan Gohman // Run SelectionDAG instruction selection on the remainder of the block 822d2ff647964ed242e67ac12f7d21a58c864309d95Dan Gohman // not handled by FastISel. If FastISel is not run, this is the entire 8233df24e667f04a7003342b534310919abc9c87418Dan Gohman // block. 824390f3ace34855a3d4c9e0adf468976375f8c6dc1Devang Patel if (BI != End) { 825390f3ace34855a3d4c9e0adf468976375f8c6dc1Devang Patel // If FastISel is run and it has known DebugLoc then use it. 826390f3ace34855a3d4c9e0adf468976375f8c6dc1Devang Patel if (FastIS && !FastIS->getCurDebugLoc().isUnknown()) 827390f3ace34855a3d4c9e0adf468976375f8c6dc1Devang Patel SDL->setCurDebugLoc(FastIS->getCurDebugLoc()); 8289f1185076d60153fd35feb3cadb1b4cd8debc0b6Evan Cheng SelectBasicBlock(LLVMBB, BI, End); 829390f3ace34855a3d4c9e0adf468976375f8c6dc1Devang Patel } 830381cb07544a2bc119e39969d7d508a6247773e1cEvan Cheng 8317c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman FinishBasicBlock(); 83239fd6e81b1b0de8b820155dc6a0dae226c109de6Evan Cheng } 833a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman 834a43abd102f123f6d3bd9ad92045f8119e3fb6153Dan Gohman delete FastIS; 8350e5f1306b059b62d7725f324e087efbc8e7a782dDan Gohman} 8360e5f1306b059b62d7725f324e087efbc8e7a782dDan Gohman 837fed90b6d097d50881afb45e4d79f430db66dd741Dan Gohmanvoid 8387c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan GohmanSelectionDAGISel::FinishBasicBlock() { 8391c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner 840bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Target-post-processed machine code:\n"); 841f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman DEBUG(BB->dump()); 8424198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov 843bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner DEBUG(errs() << "Total amount of phi nodes to update: " 844bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner << SDL->PHINodesToUpdate.size() << "\n"); 8457c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman DEBUG(for (unsigned i = 0, e = SDL->PHINodesToUpdate.size(); i != e; ++i) 846bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner errs() << "Node " << i << " : (" 847bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner << SDL->PHINodesToUpdate[i].first 848bbbfa99d3d18fe9f20265305e833666645ada528Chris Lattner << ", " << SDL->PHINodesToUpdate[i].second << ")\n"); 849a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 850a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner // Next, now that we know what the last MBB the LLVM BB expanded is, update 8511c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner // PHI nodes in successors. 8527c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman if (SDL->SwitchCases.empty() && 8537c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->JTCases.empty() && 8547c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->BitTestCases.empty()) { 8557c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned i = 0, e = SDL->PHINodesToUpdate.size(); i != e; ++i) { 8567c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman MachineInstr *PHI = SDL->PHINodesToUpdate[i].first; 857f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman assert(PHI->getOpcode() == TargetInstrInfo::PHI && 858f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman "This is not a machine PHI node that we are updating!"); 8597c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateReg(SDL->PHINodesToUpdate[i].second, 8609ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner false)); 8619ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner PHI->addOperand(MachineOperand::CreateMBB(BB)); 862f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman } 8637c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->PHINodesToUpdate.clear(); 864f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman return; 8651c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner } 8664198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov 8677c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned i = 0, e = SDL->BitTestCases.size(); i != e; ++i) { 8684198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // Lower header first, if it wasn't already lowered 8697c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman if (!SDL->BitTestCases[i].Emitted) { 8704198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // Set the current basic block to the mbb we wish to insert the code into 8717c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman BB = SDL->BitTestCases[i].Parent; 8727c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->setCurrentBasicBlock(BB); 8734198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // Emit the code 8747c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visitBitTestHeader(SDL->BitTestCases[i]); 8757c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG->setRoot(SDL->getRoot()); 876f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CodeGenAndEmitDAG(); 8777c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->clear(); 878a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar } 8794198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov 8807c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned j = 0, ej = SDL->BitTestCases[i].Cases.size(); j != ej; ++j) { 8814198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // Set the current basic block to the mbb we wish to insert the code into 8827c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman BB = SDL->BitTestCases[i].Cases[j].ThisBB; 8837c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->setCurrentBasicBlock(BB); 8844198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // Emit the code 8854198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov if (j+1 != ej) 8867c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visitBitTestCase(SDL->BitTestCases[i].Cases[j+1].ThisBB, 8877c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->BitTestCases[i].Reg, 8887c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->BitTestCases[i].Cases[j]); 8894198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov else 8907c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visitBitTestCase(SDL->BitTestCases[i].Default, 8917c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->BitTestCases[i].Reg, 8927c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->BitTestCases[i].Cases[j]); 893a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 894a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 8957c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG->setRoot(SDL->getRoot()); 896f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CodeGenAndEmitDAG(); 8977c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->clear(); 8984198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 8994198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov 9004198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // Update PHI Nodes 9017c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned pi = 0, pe = SDL->PHINodesToUpdate.size(); pi != pe; ++pi) { 9027c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman MachineInstr *PHI = SDL->PHINodesToUpdate[pi].first; 9034198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov MachineBasicBlock *PHIBB = PHI->getParent(); 9044198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov assert(PHI->getOpcode() == TargetInstrInfo::PHI && 9054198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov "This is not a machine PHI node that we are updating!"); 9064198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // This is "default" BB. We have two jumps to it. From "header" BB and 9074198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // from last "case" BB. 9087c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman if (PHIBB == SDL->BitTestCases[i].Default) { 9097c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateReg(SDL->PHINodesToUpdate[pi].second, 9109ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner false)); 9117c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateMBB(SDL->BitTestCases[i].Parent)); 9127c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateReg(SDL->PHINodesToUpdate[pi].second, 9139ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner false)); 9147c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateMBB(SDL->BitTestCases[i].Cases. 9159ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner back().ThisBB)); 9164198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 9174198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // One of "cases" BB. 9187c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned j = 0, ej = SDL->BitTestCases[i].Cases.size(); 9197c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman j != ej; ++j) { 9207c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman MachineBasicBlock* cBB = SDL->BitTestCases[i].Cases[j].ThisBB; 9214198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov if (cBB->succ_end() != 9224198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov std::find(cBB->succ_begin(),cBB->succ_end(), PHIBB)) { 9237c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateReg(SDL->PHINodesToUpdate[pi].second, 9249ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner false)); 9259ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner PHI->addOperand(MachineOperand::CreateMBB(cBB)); 9264198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 9274198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 9284198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 9294198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 9307c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->BitTestCases.clear(); 9314198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov 9329453eea49bca1c3904047db495855c93e001d1cdNate Begeman // If the JumpTable record is filled in, then we need to emit a jump table. 9339453eea49bca1c3904047db495855c93e001d1cdNate Begeman // Updating the PHI nodes is tricky in this case, since we need to determine 9349453eea49bca1c3904047db495855c93e001d1cdNate Begeman // whether the PHI is a successor of the range check MBB or the jump table MBB 9357c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned i = 0, e = SDL->JTCases.size(); i != e; ++i) { 9363a84b9baf67c938454840d10d9e53269c755cd3eAnton Korobeynikov // Lower header first, if it wasn't already lowered 9377c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman if (!SDL->JTCases[i].first.Emitted) { 9383a84b9baf67c938454840d10d9e53269c755cd3eAnton Korobeynikov // Set the current basic block to the mbb we wish to insert the code into 9397c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman BB = SDL->JTCases[i].first.HeaderBB; 9407c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->setCurrentBasicBlock(BB); 9413a84b9baf67c938454840d10d9e53269c755cd3eAnton Korobeynikov // Emit the code 9427c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visitJumpTableHeader(SDL->JTCases[i].second, SDL->JTCases[i].first); 9437c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG->setRoot(SDL->getRoot()); 944f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CodeGenAndEmitDAG(); 9457c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->clear(); 9464198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov } 947a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 94837efe6764568a3829fee26aba532283131d1a104Nate Begeman // Set the current basic block to the mbb we wish to insert the code into 9497c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman BB = SDL->JTCases[i].second.MBB; 9507c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->setCurrentBasicBlock(BB); 95137efe6764568a3829fee26aba532283131d1a104Nate Begeman // Emit the code 9527c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visitJumpTable(SDL->JTCases[i].second); 9537c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG->setRoot(SDL->getRoot()); 954f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CodeGenAndEmitDAG(); 9557c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->clear(); 956a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 95737efe6764568a3829fee26aba532283131d1a104Nate Begeman // Update PHI Nodes 9587c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned pi = 0, pe = SDL->PHINodesToUpdate.size(); pi != pe; ++pi) { 9597c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman MachineInstr *PHI = SDL->PHINodesToUpdate[pi].first; 96037efe6764568a3829fee26aba532283131d1a104Nate Begeman MachineBasicBlock *PHIBB = PHI->getParent(); 96137efe6764568a3829fee26aba532283131d1a104Nate Begeman assert(PHI->getOpcode() == TargetInstrInfo::PHI && 96237efe6764568a3829fee26aba532283131d1a104Nate Begeman "This is not a machine PHI node that we are updating!"); 9634198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // "default" BB. We can go there only from header BB. 9647c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman if (PHIBB == SDL->JTCases[i].second.Default) { 965ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng PHI->addOperand 966ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng (MachineOperand::CreateReg(SDL->PHINodesToUpdate[pi].second, false)); 967ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng PHI->addOperand 968ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng (MachineOperand::CreateMBB(SDL->JTCases[i].first.HeaderBB)); 969f4360a478944af45d5f851a0903fbbfa44f520dcNate Begeman } 9704198c58c716cbe4516ac3a1a407a3cd52548bc3bAnton Korobeynikov // JT BB. Just iterate over successors here 971f4360a478944af45d5f851a0903fbbfa44f520dcNate Begeman if (BB->succ_end() != std::find(BB->succ_begin(),BB->succ_end(), PHIBB)) { 972ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng PHI->addOperand 973ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng (MachineOperand::CreateReg(SDL->PHINodesToUpdate[pi].second, false)); 9749ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner PHI->addOperand(MachineOperand::CreateMBB(BB)); 97537efe6764568a3829fee26aba532283131d1a104Nate Begeman } 97637efe6764568a3829fee26aba532283131d1a104Nate Begeman } 97737efe6764568a3829fee26aba532283131d1a104Nate Begeman } 9787c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->JTCases.clear(); 979a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 980b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner // If the switch block involved a branch to one of the actual successors, we 981b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner // need to update PHI nodes in that block. 9827c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned i = 0, e = SDL->PHINodesToUpdate.size(); i != e; ++i) { 9837c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman MachineInstr *PHI = SDL->PHINodesToUpdate[i].first; 984b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner assert(PHI->getOpcode() == TargetInstrInfo::PHI && 985b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner "This is not a machine PHI node that we are updating!"); 986b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner if (BB->isSuccessor(PHI->getParent())) { 9877c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman PHI->addOperand(MachineOperand::CreateReg(SDL->PHINodesToUpdate[i].second, 9889ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner false)); 9899ce2e9d5a07cb3e0176cb32838231243829d67c5Chris Lattner PHI->addOperand(MachineOperand::CreateMBB(BB)); 990b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner } 991b2e806eecd85c98367f038817e742ef183dd9f87Chris Lattner } 992a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 993f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman // If we generated any switch lowering information, build and codegen any 994f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman // additional DAGs necessary. 9957c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman for (unsigned i = 0, e = SDL->SwitchCases.size(); i != e; ++i) { 996f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman // Set the current basic block to the mbb we wish to insert the code into 997fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng MachineBasicBlock *ThisBB = BB = SDL->SwitchCases[i].ThisBB; 9987c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->setCurrentBasicBlock(BB); 999a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1000f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman // Emit the code 10017c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->visitSwitchCase(SDL->SwitchCases[i]); 10027c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman CurDAG->setRoot(SDL->getRoot()); 1003f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman CodeGenAndEmitDAG(); 1004a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1005d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // Handle any PHI nodes in successors of this chunk, as if we were coming 1006d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // from the original BB before switch expansion. Note that PHI nodes can 1007d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // occur multiple times in PHINodesToUpdate. We have to be very careful to 1008d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // handle them the right number of times. 10097c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman while ((BB = SDL->SwitchCases[i].TrueBB)) { // Handle LHS and RHS. 1010fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng // If new BB's are created during scheduling, the edges may have been 1011ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng // updated. That is, the edge from ThisBB to BB may have been split and 1012ce31910eae5bd4896fa6c27798e7b26885691d3bEvan Cheng // BB's predecessor is now another block. 1013fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng DenseMap<MachineBasicBlock*, MachineBasicBlock*>::iterator EI = 1014fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng SDL->EdgeMapping.find(BB); 1015fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng if (EI != SDL->EdgeMapping.end()) 1016fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng ThisBB = EI->second; 1017d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner for (MachineBasicBlock::iterator Phi = BB->begin(); 1018d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner Phi != BB->end() && Phi->getOpcode() == TargetInstrInfo::PHI; ++Phi){ 1019d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // This value for this PHI node is recorded in PHINodesToUpdate, get it. 1020d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner for (unsigned pn = 0; ; ++pn) { 10217c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman assert(pn != SDL->PHINodesToUpdate.size() && 10227c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman "Didn't find PHI entry!"); 10238be58a11868ae081c195c107cd39a07f1f523877Evan Cheng if (SDL->PHINodesToUpdate[pn].first == Phi) { 10248be58a11868ae081c195c107cd39a07f1f523877Evan Cheng Phi->addOperand(MachineOperand::CreateReg(SDL->PHINodesToUpdate[pn]. 10258be58a11868ae081c195c107cd39a07f1f523877Evan Cheng second, false)); 1026fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng Phi->addOperand(MachineOperand::CreateMBB(ThisBB)); 1027d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner break; 10288be58a11868ae081c195c107cd39a07f1f523877Evan Cheng } 1029d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner } 1030f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman } 1031a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1032d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // Don't process RHS if same block as LHS. 10337c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman if (BB == SDL->SwitchCases[i].FalseBB) 10347c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->SwitchCases[i].FalseBB = 0; 1035a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1036d5e93c07957844e3086fb12d686b93dbbd2524c2Chris Lattner // If we haven't handled the RHS, do so now. Otherwise, we're done. 10377c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->SwitchCases[i].TrueBB = SDL->SwitchCases[i].FalseBB; 10387c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->SwitchCases[i].FalseBB = 0; 1039f15485a8d0dff5f720b7ad27346129ac5c3ec503Nate Begeman } 10407c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman assert(SDL->SwitchCases[i].TrueBB == 0 && SDL->SwitchCases[i].FalseBB == 0); 1041fb2e752e4175920d0531f2afc93a23d0cdf4db14Evan Cheng SDL->clear(); 1042a33ef4816d2c192e36e7c025d18c66e89ef9d311Chris Lattner } 10437c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->SwitchCases.clear(); 10447c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman 10457c3234c6be0dc0bdf4b5d6f848cd728a77f349d7Dan Gohman SDL->PHINodesToUpdate.clear(); 10461c08c714bb3d07c3b39f06bfcbb4559fefca73f9Chris Lattner} 1047a9c2091cd38e401c846391c9951ff416e709b65eEvan Cheng 104813ec702c430b91ee49b9e6d9581cd95412f216c8Jim Laskey 10490a3776dc6f702d4e3f4a189df7f43d8f99957773Dan Gohman/// Create the scheduler. If a specific scheduler was specified 10500a3776dc6f702d4e3f4a189df7f43d8f99957773Dan Gohman/// via the SchedulerRegistry, use it, otherwise select the 10510a3776dc6f702d4e3f4a189df7f43d8f99957773Dan Gohman/// one preferred by the target. 10525e84368b26415b3bb7f3f8d9cff3e05938dd82d0Dan Gohman/// 105347ac0f0c7c39289f5970688154e385be22b7f293Dan GohmanScheduleDAGSDNodes *SelectionDAGISel::CreateScheduler() { 1054eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey RegisterScheduler::FunctionPassCtor Ctor = RegisterScheduler::getDefault(); 1055a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 105613ec702c430b91ee49b9e6d9581cd95412f216c8Jim Laskey if (!Ctor) { 1057eb577ba3b815a1fa4627b060dd2345d17abf672dJim Laskey Ctor = ISHeuristic; 10589373beba6010dd34316a801c3a9b37ab9e048031Jim Laskey RegisterScheduler::setDefault(Ctor); 10594ef10867499aa146cd819c78d8d37a8353d4f0ffEvan Cheng } 1060a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1061be8cc2a3dedeb7685f07e68cdc4b9502eb97eb2bBill Wendling return Ctor(this, OptLevel); 1062a9c2091cd38e401c846391c9951ff416e709b65eEvan Cheng} 10630e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner 1064fc54c552963545a81e4ea38e60460590afb2d5aeDan GohmanScheduleHazardRecognizer *SelectionDAGISel::CreateTargetHazardRecognizer() { 1065fc54c552963545a81e4ea38e60460590afb2d5aeDan Gohman return new ScheduleHazardRecognizer(); 10669ff542f2cce5bf7bf3cf9f692cf3ec0690ad2b3bJim Laskey} 10679ff542f2cce5bf7bf3cf9f692cf3ec0690ad2b3bJim Laskey 1068755480681c795d585c73556c028b6143c46bda86Chris Lattner//===----------------------------------------------------------------------===// 1069755480681c795d585c73556c028b6143c46bda86Chris Lattner// Helper functions used by the generated instruction selector. 1070755480681c795d585c73556c028b6143c46bda86Chris Lattner//===----------------------------------------------------------------------===// 1071755480681c795d585c73556c028b6143c46bda86Chris Lattner// Calls to these methods are generated by tblgen. 1072755480681c795d585c73556c028b6143c46bda86Chris Lattner 1073755480681c795d585c73556c028b6143c46bda86Chris Lattner/// CheckAndMask - The isel is trying to match something like (and X, 255). If 1074755480681c795d585c73556c028b6143c46bda86Chris Lattner/// the dag combiner simplified the 255, we still want to match. RHS is the 1075755480681c795d585c73556c028b6143c46bda86Chris Lattner/// actual value in the DAG on the RHS of an AND, and DesiredMaskS is the value 1076755480681c795d585c73556c028b6143c46bda86Chris Lattner/// specified in the .td file (e.g. 255). 1077a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbarbool SelectionDAGISel::CheckAndMask(SDValue LHS, ConstantSDNode *RHS, 1078dc9b3d0bb5ed3a3f59cad61e264f0ec43c946459Dan Gohman int64_t DesiredMaskS) const { 10792e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman const APInt &ActualMask = RHS->getAPIntValue(); 10802e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman const APInt &DesiredMask = APInt(LHS.getValueSizeInBits(), DesiredMaskS); 1081a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1082755480681c795d585c73556c028b6143c46bda86Chris Lattner // If the actual mask exactly matches, success! 1083755480681c795d585c73556c028b6143c46bda86Chris Lattner if (ActualMask == DesiredMask) 1084755480681c795d585c73556c028b6143c46bda86Chris Lattner return true; 1085a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1086755480681c795d585c73556c028b6143c46bda86Chris Lattner // If the actual AND mask is allowing unallowed bits, this doesn't match. 10872e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman if (ActualMask.intersects(~DesiredMask)) 1088755480681c795d585c73556c028b6143c46bda86Chris Lattner return false; 1089a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1090755480681c795d585c73556c028b6143c46bda86Chris Lattner // Otherwise, the DAG Combiner may have proven that the value coming in is 1091755480681c795d585c73556c028b6143c46bda86Chris Lattner // either already zero or is not demanded. Check for known zero input bits. 10922e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman APInt NeededMask = DesiredMask & ~ActualMask; 1093ea859be53ca13a1547c4675549946b74dc3c6f41Dan Gohman if (CurDAG->MaskedValueIsZero(LHS, NeededMask)) 1094755480681c795d585c73556c028b6143c46bda86Chris Lattner return true; 1095a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1096755480681c795d585c73556c028b6143c46bda86Chris Lattner // TODO: check to see if missing bits are just not demanded. 1097755480681c795d585c73556c028b6143c46bda86Chris Lattner 1098755480681c795d585c73556c028b6143c46bda86Chris Lattner // Otherwise, this pattern doesn't match. 1099755480681c795d585c73556c028b6143c46bda86Chris Lattner return false; 1100755480681c795d585c73556c028b6143c46bda86Chris Lattner} 1101755480681c795d585c73556c028b6143c46bda86Chris Lattner 1102755480681c795d585c73556c028b6143c46bda86Chris Lattner/// CheckOrMask - The isel is trying to match something like (or X, 255). If 1103755480681c795d585c73556c028b6143c46bda86Chris Lattner/// the dag combiner simplified the 255, we still want to match. RHS is the 1104755480681c795d585c73556c028b6143c46bda86Chris Lattner/// actual value in the DAG on the RHS of an OR, and DesiredMaskS is the value 1105755480681c795d585c73556c028b6143c46bda86Chris Lattner/// specified in the .td file (e.g. 255). 1106a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbarbool SelectionDAGISel::CheckOrMask(SDValue LHS, ConstantSDNode *RHS, 11072e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman int64_t DesiredMaskS) const { 11082e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman const APInt &ActualMask = RHS->getAPIntValue(); 11092e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman const APInt &DesiredMask = APInt(LHS.getValueSizeInBits(), DesiredMaskS); 1110a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1111755480681c795d585c73556c028b6143c46bda86Chris Lattner // If the actual mask exactly matches, success! 1112755480681c795d585c73556c028b6143c46bda86Chris Lattner if (ActualMask == DesiredMask) 1113755480681c795d585c73556c028b6143c46bda86Chris Lattner return true; 1114a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1115755480681c795d585c73556c028b6143c46bda86Chris Lattner // If the actual AND mask is allowing unallowed bits, this doesn't match. 11162e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman if (ActualMask.intersects(~DesiredMask)) 1117755480681c795d585c73556c028b6143c46bda86Chris Lattner return false; 1118a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1119755480681c795d585c73556c028b6143c46bda86Chris Lattner // Otherwise, the DAG Combiner may have proven that the value coming in is 1120755480681c795d585c73556c028b6143c46bda86Chris Lattner // either already zero or is not demanded. Check for known zero input bits. 11212e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman APInt NeededMask = DesiredMask & ~ActualMask; 1122a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 11232e68b6f52d0979575b2f02ed29717d907ba0684cDan Gohman APInt KnownZero, KnownOne; 1124ea859be53ca13a1547c4675549946b74dc3c6f41Dan Gohman CurDAG->ComputeMaskedBits(LHS, NeededMask, KnownZero, KnownOne); 1125a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1126755480681c795d585c73556c028b6143c46bda86Chris Lattner // If all the missing bits in the or are already known to be set, match! 1127755480681c795d585c73556c028b6143c46bda86Chris Lattner if ((NeededMask & KnownOne) == NeededMask) 1128755480681c795d585c73556c028b6143c46bda86Chris Lattner return true; 1129a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1130755480681c795d585c73556c028b6143c46bda86Chris Lattner // TODO: check to see if missing bits are just not demanded. 1131a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 1132755480681c795d585c73556c028b6143c46bda86Chris Lattner // Otherwise, this pattern doesn't match. 1133755480681c795d585c73556c028b6143c46bda86Chris Lattner return false; 1134755480681c795d585c73556c028b6143c46bda86Chris Lattner} 1135755480681c795d585c73556c028b6143c46bda86Chris Lattner 11369ff542f2cce5bf7bf3cf9f692cf3ec0690ad2b3bJim Laskey 11370e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner/// SelectInlineAsmMemoryOperands - Calls to this are automatically generated 11380e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner/// by tblgen. Others should not call it. 11390e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattnervoid SelectionDAGISel:: 1140f350b277f32d7d47f86c0e54f4aec4d470500618Dan GohmanSelectInlineAsmMemoryOperands(std::vector<SDValue> &Ops) { 1141475871a144eb604ddaf37503397ba0941442e5fbDan Gohman std::vector<SDValue> InOps; 11420e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner std::swap(InOps, Ops); 11430e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner 11440e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner Ops.push_back(InOps[0]); // input chain. 11450e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner Ops.push_back(InOps[1]); // input asm string. 11460e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner 11470e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner unsigned i = 2, e = InOps.size(); 1148825b72b0571821bf2d378749f69d6c4cfb52d2f9Owen Anderson if (InOps[e-1].getValueType() == MVT::Flag) 11490e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner --e; // Don't process a flag operand if it is here. 1150a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 11510e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner while (i != e) { 1152f5aeb1a8e4cf272c7348376d185ef8d8267653e0Dan Gohman unsigned Flags = cast<ConstantSDNode>(InOps[i])->getZExtValue(); 115386b49f8e2de796cb46c7c8b6a4c4900533fd53f4Dale Johannesen if ((Flags & 7) != 4 /*MEM*/) { 11540e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner // Just skip over this operand, copying the operands verbatim. 1155697cbbfb00c318f98d6eb51945f077e2bfe8781eEvan Cheng Ops.insert(Ops.end(), InOps.begin()+i, 1156697cbbfb00c318f98d6eb51945f077e2bfe8781eEvan Cheng InOps.begin()+i+InlineAsm::getNumOperandRegisters(Flags) + 1); 1157697cbbfb00c318f98d6eb51945f077e2bfe8781eEvan Cheng i += InlineAsm::getNumOperandRegisters(Flags) + 1; 11580e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner } else { 1159697cbbfb00c318f98d6eb51945f077e2bfe8781eEvan Cheng assert(InlineAsm::getNumOperandRegisters(Flags) == 1 && 1160697cbbfb00c318f98d6eb51945f077e2bfe8781eEvan Cheng "Memory operand with multiple values?"); 11610e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner // Otherwise, this is a memory operand. Ask the target to select it. 1162475871a144eb604ddaf37503397ba0941442e5fbDan Gohman std::vector<SDValue> SelOps; 1163f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman if (SelectInlineAsmMemoryOperand(InOps[i+1], 'm', SelOps)) { 11647d696d80409aad20bb5da0fc4eccab941dd371d4Torok Edwin llvm_report_error("Could not match memory address. Inline asm" 11657d696d80409aad20bb5da0fc4eccab941dd371d4Torok Edwin " failure!"); 11660e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner } 1167a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 11680e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner // Add this to the output node. 1169e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson EVT IntPtrTy = TLI.getPointerTy(); 117086b49f8e2de796cb46c7c8b6a4c4900533fd53f4Dale Johannesen Ops.push_back(CurDAG->getTargetConstant(4/*MEM*/ | (SelOps.size()<< 3), 1171f350b277f32d7d47f86c0e54f4aec4d470500618Dan Gohman IntPtrTy)); 11720e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner Ops.insert(Ops.end(), SelOps.begin(), SelOps.end()); 11730e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner i += 2; 11740e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner } 11750e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner } 1176a279bc3da55691784064cb47200a1c584408b8abDaniel Dunbar 11770e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner // Add the flag input back if present. 11780e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner if (e != InOps.size()) 11790e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner Ops.push_back(InOps.back()); 11800e43f2ba114df7bfc1f70d0ef62b663f6ea4c09dChris Lattner} 1181794fd75c67a2cdc128d67342c6d88a504d186896Devang Patel 1182e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson/// findFlagUse - Return use of EVT::Flag value produced by the specified 1183c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// SDNode. 1184c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// 1185c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikovstatic SDNode *findFlagUse(SDNode *N) { 1186c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov unsigned FlagResNo = N->getNumValues()-1; 1187c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) { 1188c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SDUse &Use = I.getUse(); 1189c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (Use.getResNo() == FlagResNo) 1190c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return Use.getUser(); 1191c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov } 1192c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return NULL; 1193c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov} 1194c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1195c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// findNonImmUse - Return true if "Use" is a non-immediate use of "Def". 1196c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// This function recursively traverses up the operand chain, ignoring 1197c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// certain nodes. 1198c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikovstatic bool findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse, 1199c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SDNode *Root, 1200c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SmallPtrSet<SDNode*, 16> &Visited) { 1201c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (Use->getNodeId() < Def->getNodeId() || 1202c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov !Visited.insert(Use)) 1203c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return false; 1204c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1205c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov for (unsigned i = 0, e = Use->getNumOperands(); i != e; ++i) { 1206c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SDNode *N = Use->getOperand(i).getNode(); 1207c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (N == Def) { 1208c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (Use == ImmedUse || Use == Root) 1209c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov continue; // We are not looking for immediate use. 1210c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov assert(N != Root); 1211c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return true; 1212c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov } 1213c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1214c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // Traverse up the operand chain. 1215c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (findNonImmUse(N, Def, ImmedUse, Root, Visited)) 1216c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return true; 1217c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov } 1218c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return false; 1219c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov} 1220c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1221c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// isNonImmUse - Start searching from Root up the DAG to check is Def can 1222c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// be reached. Return true if that's the case. However, ignore direct uses 1223c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// by ImmedUse (which would be U in the example illustrated in 1224c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// IsLegalAndProfitableToFold) and by Root (which can happen in the store 1225c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// case). 1226c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// FIXME: to be really generic, we should allow direct use by any node 1227c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// that is being folded. But realisticly since we only fold loads which 1228c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// have one non-chain use, we only need to watch out for load/op/store 1229c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// and load/op/cmp case where the root (store / cmp) may reach the load via 1230c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// its chain operand. 1231c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikovstatic inline bool isNonImmUse(SDNode *Root, SDNode *Def, SDNode *ImmedUse) { 1232c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SmallPtrSet<SDNode*, 16> Visited; 1233c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return findNonImmUse(Root, Def, ImmedUse, Root, Visited); 1234c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov} 1235c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1236c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// IsLegalAndProfitableToFold - Returns true if the specific operand node N of 1237c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// U can be folded during instruction selection that starts at Root and 1238c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov/// folding N is profitable. 1239c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikovbool SelectionDAGISel::IsLegalAndProfitableToFold(SDNode *N, SDNode *U, 1240c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SDNode *Root) const { 1241c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (OptLevel == CodeGenOpt::None) return false; 1242c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1243c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // If Root use can somehow reach N through a path that that doesn't contain 1244c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // U then folding N would create a cycle. e.g. In the following 1245c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // diagram, Root can reach N through X. If N is folded into into Root, then 1246c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // X is both a predecessor and a successor of U. 1247c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // 1248c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [N*] // 1249c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // ^ ^ // 1250c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // / \ // 1251c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [U*] [X]? // 1252c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // ^ ^ // 1253c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // \ / // 1254c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // \ / // 1255c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [Root*] // 1256c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // 1257c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // * indicates nodes to be folded together. 1258c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // 1259c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // If Root produces a flag, then it gets (even more) interesting. Since it 1260c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // will be "glued" together with its flag use in the scheduler, we need to 1261c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // check if it might reach N. 1262c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // 1263c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [N*] // 1264c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // ^ ^ // 1265c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // / \ // 1266c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [U*] [X]? // 1267c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // ^ ^ // 1268c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // \ \ // 1269c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // \ | // 1270c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [Root*] | // 1271c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // ^ | // 1272c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // f | // 1273c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // | / // 1274c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [Y] / // 1275c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // ^ / // 1276c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // f / // 1277c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // | / // 1278c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // [FU] // 1279c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // 1280c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // If FU (flag use) indirectly reaches N (the load), and Root folds N 1281c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // (call it Fold), then X is a predecessor of FU and a successor of 1282c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // Fold. But since Fold and FU are flagged together, this will create 1283c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov // a cycle in the scheduling graph. 1284c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1285e50ed30282bb5b4a9ed952580523f2dda16215acOwen Anderson EVT VT = Root->getValueType(Root->getNumValues()-1); 1286825b72b0571821bf2d378749f69d6c4cfb52d2f9Owen Anderson while (VT == MVT::Flag) { 1287c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov SDNode *FU = findFlagUse(Root); 1288c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov if (FU == NULL) 1289c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov break; 1290c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov Root = FU; 1291c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov VT = Root->getValueType(Root->getNumValues()-1); 1292c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov } 1293c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1294c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov return !isNonImmUse(Root, N, U); 1295c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov} 1296c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 1297e1f188fe27050ec812e5b64cc996e6bb93300392Dan GohmanSDNode *SelectionDAGISel::Select_INLINEASM(SDValue N) { 1298e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman std::vector<SDValue> Ops(N.getNode()->op_begin(), N.getNode()->op_end()); 1299e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman SelectInlineAsmMemoryOperands(Ops); 1300e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman 1301e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman std::vector<EVT> VTs; 1302e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman VTs.push_back(MVT::Other); 1303e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman VTs.push_back(MVT::Flag); 1304e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman SDValue New = CurDAG->getNode(ISD::INLINEASM, N.getDebugLoc(), 1305e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman VTs, &Ops[0], Ops.size()); 1306e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman return New.getNode(); 1307e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman} 1308e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman 1309e1f188fe27050ec812e5b64cc996e6bb93300392Dan GohmanSDNode *SelectionDAGISel::Select_UNDEF(const SDValue &N) { 1310e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::IMPLICIT_DEF, 1311e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman N.getValueType()); 1312e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman} 1313e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman 1314e1f188fe27050ec812e5b64cc996e6bb93300392Dan GohmanSDNode *SelectionDAGISel::Select_DBG_LABEL(const SDValue &N) { 1315e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman SDValue Chain = N.getOperand(0); 1316e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman unsigned C = cast<LabelSDNode>(N)->getLabelID(); 1317e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32); 1318e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::DBG_LABEL, 1319e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman MVT::Other, Tmp, Chain); 1320e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman} 1321e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman 1322e1f188fe27050ec812e5b64cc996e6bb93300392Dan GohmanSDNode *SelectionDAGISel::Select_EH_LABEL(const SDValue &N) { 1323e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman SDValue Chain = N.getOperand(0); 1324e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman unsigned C = cast<LabelSDNode>(N)->getLabelID(); 1325e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32); 1326e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::EH_LABEL, 1327e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman MVT::Other, Tmp, Chain); 1328e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman} 1329e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman 1330e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohmanvoid SelectionDAGISel::CannotYetSelect(SDValue N) { 1331e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman std::string msg; 1332e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman raw_string_ostream Msg(msg); 1333e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman Msg << "Cannot yet select: "; 1334e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman N.getNode()->print(Msg, CurDAG); 1335e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman llvm_report_error(Msg.str()); 1336e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman} 1337e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman 1338e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohmanvoid SelectionDAGISel::CannotYetSelectIntrinsic(SDValue N) { 1339e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman errs() << "Cannot yet select: "; 1340e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman unsigned iid = 1341e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman cast<ConstantSDNode>(N.getOperand(N.getOperand(0).getValueType() == MVT::Other))->getZExtValue(); 1342e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman if (iid < Intrinsic::num_intrinsics) 1343e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman llvm_report_error("Cannot yet select: intrinsic %" + Intrinsic::getName((Intrinsic::ID)iid)); 1344e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman else if (const TargetIntrinsicInfo *tii = TM.getIntrinsicInfo()) 1345e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman llvm_report_error(Twine("Cannot yet select: target intrinsic %") + 1346e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman tii->getName(iid)); 1347e1f188fe27050ec812e5b64cc996e6bb93300392Dan Gohman} 1348c1c6ef8f74fc550f29cfec1f2fb699dd8c2fb94eAnton Korobeynikov 13491997473cf72957d0e70322e2fe6fe2ab141c58a6Devang Patelchar SelectionDAGISel::ID = 0; 1350