1 //===- RegisterInfoEmitter.cpp - Generate a Register File Desc. -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tablegen backend is responsible for emitting a description of a target
11 // register file for a code generator. It uses instances of the Register,
12 // RegisterAliases, and RegisterClass classes to gather this information.
14 //===----------------------------------------------------------------------===//
16 #include "RegisterInfoEmitter.h"
17 #include "CodeGenTarget.h"
18 #include "CodeGenRegisters.h"
20 #include "llvm/ADT/StringExtras.h"
21 #include "llvm/ADT/STLExtras.h"
26 // runEnums - Print out enum values for all of the registers.
27 void RegisterInfoEmitter::runEnums(raw_ostream &OS) {
29 const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
31 std::string Namespace = Registers[0].TheDef->getValueAsString("Namespace");
33 EmitSourceFileHeader("Target Register Enum Values", OS);
34 OS << "namespace llvm {\n\n";
36 if (!Namespace.empty())
37 OS << "namespace " << Namespace << " {\n";
38 OS << " enum {\n NoRegister,\n";
40 for (unsigned i = 0, e = Registers.size(); i != e; ++i)
41 OS << " " << Registers[i].getName() << ", \t// " << i+1 << "\n";
42 OS << " NUM_TARGET_REGS \t// " << Registers.size()+1 << "\n";
44 if (!Namespace.empty())
46 OS << "} // End llvm namespace \n";
49 void RegisterInfoEmitter::runHeader(raw_ostream &OS) {
50 EmitSourceFileHeader("Register Information Header Fragment", OS);
52 const std::string &TargetName = Target.getName();
53 std::string ClassName = TargetName + "GenRegisterInfo";
55 OS << "#include \"llvm/Target/TargetRegisterInfo.h\"\n";
56 OS << "#include <string>\n\n";
58 OS << "namespace llvm {\n\n";
60 OS << "struct " << ClassName << " : public TargetRegisterInfo {\n"
61 << " explicit " << ClassName
62 << "(int CallFrameSetupOpcode = -1, int CallFrameDestroyOpcode = -1);\n"
63 << " virtual int getDwarfRegNumFull(unsigned RegNum, "
64 << "unsigned Flavour) const;\n"
65 << " virtual int getDwarfRegNum(unsigned RegNum, bool isEH) const = 0;\n"
66 << " virtual bool needsStackRealignment(const MachineFunction &) const\n"
67 << " { return false; }\n"
68 << " unsigned getSubReg(unsigned RegNo, unsigned Index) const;\n"
71 const std::vector<CodeGenRegisterClass> &RegisterClasses =
72 Target.getRegisterClasses();
74 if (!RegisterClasses.empty()) {
75 OS << "namespace " << RegisterClasses[0].Namespace
76 << " { // Register classes\n";
79 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
81 OS << " " << RegisterClasses[i].getName() << "RegClassID";
86 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
87 const std::string &Name = RegisterClasses[i].getName();
89 // Output the register class definition.
90 OS << " struct " << Name << "Class : public TargetRegisterClass {\n"
91 << " " << Name << "Class();\n"
92 << RegisterClasses[i].MethodProtos << " };\n";
94 // Output the extern for the instance.
95 OS << " extern " << Name << "Class\t" << Name << "RegClass;\n";
96 // Output the extern for the pointer to the instance (should remove).
97 OS << " static TargetRegisterClass * const "<< Name <<"RegisterClass = &"
98 << Name << "RegClass;\n";
100 OS << "} // end of namespace " << TargetName << "\n\n";
102 OS << "} // End llvm namespace \n";
105 bool isSubRegisterClass(const CodeGenRegisterClass &RC,
106 std::set<Record*> &RegSet) {
107 for (unsigned i = 0, e = RC.Elements.size(); i != e; ++i) {
108 Record *Reg = RC.Elements[i];
109 if (!RegSet.count(Reg))
115 static void addSuperReg(Record *R, Record *S,
116 std::map<Record*, std::set<Record*>, LessRecord> &SubRegs,
117 std::map<Record*, std::set<Record*>, LessRecord> &SuperRegs,
118 std::map<Record*, std::set<Record*>, LessRecord> &Aliases) {
120 errs() << "Error: recursive sub-register relationship between"
121 << " register " << getQualifiedName(R)
122 << " and its sub-registers?\n";
125 if (!SuperRegs[R].insert(S).second)
127 SubRegs[S].insert(R);
128 Aliases[R].insert(S);
129 Aliases[S].insert(R);
130 if (SuperRegs.count(S))
131 for (std::set<Record*>::iterator I = SuperRegs[S].begin(),
132 E = SuperRegs[S].end(); I != E; ++I)
133 addSuperReg(R, *I, SubRegs, SuperRegs, Aliases);
136 static void addSubSuperReg(Record *R, Record *S,
137 std::map<Record*, std::set<Record*>, LessRecord> &SubRegs,
138 std::map<Record*, std::set<Record*>, LessRecord> &SuperRegs,
139 std::map<Record*, std::set<Record*>, LessRecord> &Aliases) {
141 errs() << "Error: recursive sub-register relationship between"
142 << " register " << getQualifiedName(R)
143 << " and its sub-registers?\n";
147 if (!SubRegs[R].insert(S).second)
149 addSuperReg(S, R, SubRegs, SuperRegs, Aliases);
150 Aliases[R].insert(S);
151 Aliases[S].insert(R);
152 if (SubRegs.count(S))
153 for (std::set<Record*>::iterator I = SubRegs[S].begin(),
154 E = SubRegs[S].end(); I != E; ++I)
155 addSubSuperReg(R, *I, SubRegs, SuperRegs, Aliases);
158 class RegisterSorter {
160 std::map<Record*, std::set<Record*>, LessRecord> &RegisterSubRegs;
163 RegisterSorter(std::map<Record*, std::set<Record*>, LessRecord> &RS)
164 : RegisterSubRegs(RS) {};
166 bool operator()(Record *RegA, Record *RegB) {
167 // B is sub-register of A.
168 return RegisterSubRegs.count(RegA) && RegisterSubRegs[RegA].count(RegB);
172 // RegisterInfoEmitter::run - Main register file description emitter.
174 void RegisterInfoEmitter::run(raw_ostream &OS) {
175 CodeGenTarget Target;
176 EmitSourceFileHeader("Register Information Source Fragment", OS);
178 OS << "namespace llvm {\n\n";
180 // Start out by emitting each of the register classes... to do this, we build
181 // a set of registers which belong to a register class, this is to ensure that
182 // each register is only in a single register class.
184 const std::vector<CodeGenRegisterClass> &RegisterClasses =
185 Target.getRegisterClasses();
187 // Loop over all of the register classes... emitting each one.
188 OS << "namespace { // Register classes...\n";
190 // RegClassesBelongedTo - Keep track of which register classes each reg
192 std::multimap<Record*, const CodeGenRegisterClass*> RegClassesBelongedTo;
194 // Emit the register enum value arrays for each RegisterClass
195 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
196 const CodeGenRegisterClass &RC = RegisterClasses[rc];
198 // Give the register class a legal C name if it's anonymous.
199 std::string Name = RC.TheDef->getName();
201 // Emit the register list now.
202 OS << " // " << Name << " Register Class...\n"
203 << " static const unsigned " << Name
205 for (unsigned i = 0, e = RC.Elements.size(); i != e; ++i) {
206 Record *Reg = RC.Elements[i];
207 OS << getQualifiedName(Reg) << ", ";
209 // Keep track of which regclasses this register is in.
210 RegClassesBelongedTo.insert(std::make_pair(Reg, &RC));
215 // Emit the ValueType arrays for each RegisterClass
216 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
217 const CodeGenRegisterClass &RC = RegisterClasses[rc];
219 // Give the register class a legal C name if it's anonymous.
220 std::string Name = RC.TheDef->getName() + "VTs";
222 // Emit the register list now.
224 << " Register Class Value Types...\n"
225 << " static const MVT " << Name
227 for (unsigned i = 0, e = RC.VTs.size(); i != e; ++i)
228 OS << getEnumName(RC.VTs[i]) << ", ";
229 OS << "MVT::Other\n };\n\n";
231 OS << "} // end anonymous namespace\n\n";
233 // Now that all of the structs have been emitted, emit the instances.
234 if (!RegisterClasses.empty()) {
235 OS << "namespace " << RegisterClasses[0].Namespace
236 << " { // Register class instances\n";
237 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i)
238 OS << " " << RegisterClasses[i].getName() << "Class\t"
239 << RegisterClasses[i].getName() << "RegClass;\n";
241 std::map<unsigned, std::set<unsigned> > SuperClassMap;
242 std::map<unsigned, std::set<unsigned> > SuperRegClassMap;
245 // Emit the sub-register classes for each RegisterClass
246 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
247 const CodeGenRegisterClass &RC = RegisterClasses[rc];
249 // Give the register class a legal C name if it's anonymous.
250 std::string Name = RC.TheDef->getName();
253 << " Sub-register Classes...\n"
254 << " static const TargetRegisterClass* const "
255 << Name << "SubRegClasses[] = {\n ";
259 for (unsigned subrc = 0, subrcMax = RC.SubRegClasses.size();
260 subrc != subrcMax; ++subrc) {
261 unsigned rc2 = 0, e2 = RegisterClasses.size();
262 for (; rc2 != e2; ++rc2) {
263 const CodeGenRegisterClass &RC2 = RegisterClasses[rc2];
264 if (RC.SubRegClasses[subrc]->getName() == RC2.getName()) {
267 OS << "&" << getQualifiedName(RC2.TheDef) << "RegClass";
270 std::map<unsigned, std::set<unsigned> >::iterator SCMI =
271 SuperRegClassMap.find(rc2);
272 if (SCMI == SuperRegClassMap.end()) {
273 SuperRegClassMap.insert(std::make_pair(rc2,
274 std::set<unsigned>()));
275 SCMI = SuperRegClassMap.find(rc2);
277 SCMI->second.insert(rc);
282 throw "Register Class member '" +
283 RC.SubRegClasses[subrc]->getName() +
284 "' is not a valid RegisterClass!";
287 OS << (!Empty ? ", " : "") << "NULL";
291 // Emit the super-register classes for each RegisterClass
292 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
293 const CodeGenRegisterClass &RC = RegisterClasses[rc];
295 // Give the register class a legal C name if it's anonymous.
296 std::string Name = RC.TheDef->getName();
299 << " Super-register Classes...\n"
300 << " static const TargetRegisterClass* const "
301 << Name << "SuperRegClasses[] = {\n ";
304 std::map<unsigned, std::set<unsigned> >::iterator I =
305 SuperRegClassMap.find(rc);
306 if (I != SuperRegClassMap.end()) {
307 for (std::set<unsigned>::iterator II = I->second.begin(),
308 EE = I->second.end(); II != EE; ++II) {
309 const CodeGenRegisterClass &RC2 = RegisterClasses[*II];
312 OS << "&" << getQualifiedName(RC2.TheDef) << "RegClass";
317 OS << (!Empty ? ", " : "") << "NULL";
321 // Emit the sub-classes array for each RegisterClass
322 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
323 const CodeGenRegisterClass &RC = RegisterClasses[rc];
325 // Give the register class a legal C name if it's anonymous.
326 std::string Name = RC.TheDef->getName();
328 std::set<Record*> RegSet;
329 for (unsigned i = 0, e = RC.Elements.size(); i != e; ++i) {
330 Record *Reg = RC.Elements[i];
335 << " Register Class sub-classes...\n"
336 << " static const TargetRegisterClass* const "
337 << Name << "Subclasses[] = {\n ";
340 for (unsigned rc2 = 0, e2 = RegisterClasses.size(); rc2 != e2; ++rc2) {
341 const CodeGenRegisterClass &RC2 = RegisterClasses[rc2];
343 // RC2 is a sub-class of RC if it is a valid replacement for any
344 // instruction operand where an RC register is required. It must satisfy
347 // 1. All RC2 registers are also in RC.
348 // 2. The RC2 spill size must not be smaller that the RC spill size.
349 // 3. RC2 spill alignment must be compatible with RC.
351 // Sub-classes are used to determine if a virtual register can be used
352 // as an instruction operand, or if it must be copied first.
354 if (rc == rc2 || RC2.Elements.size() > RC.Elements.size() ||
355 (RC.SpillAlignment && RC2.SpillAlignment % RC.SpillAlignment) ||
356 RC.SpillSize > RC2.SpillSize || !isSubRegisterClass(RC2, RegSet))
359 if (!Empty) OS << ", ";
360 OS << "&" << getQualifiedName(RC2.TheDef) << "RegClass";
363 std::map<unsigned, std::set<unsigned> >::iterator SCMI =
364 SuperClassMap.find(rc2);
365 if (SCMI == SuperClassMap.end()) {
366 SuperClassMap.insert(std::make_pair(rc2, std::set<unsigned>()));
367 SCMI = SuperClassMap.find(rc2);
369 SCMI->second.insert(rc);
372 OS << (!Empty ? ", " : "") << "NULL";
376 for (unsigned rc = 0, e = RegisterClasses.size(); rc != e; ++rc) {
377 const CodeGenRegisterClass &RC = RegisterClasses[rc];
379 // Give the register class a legal C name if it's anonymous.
380 std::string Name = RC.TheDef->getName();
383 << " Register Class super-classes...\n"
384 << " static const TargetRegisterClass* const "
385 << Name << "Superclasses[] = {\n ";
388 std::map<unsigned, std::set<unsigned> >::iterator I =
389 SuperClassMap.find(rc);
390 if (I != SuperClassMap.end()) {
391 for (std::set<unsigned>::iterator II = I->second.begin(),
392 EE = I->second.end(); II != EE; ++II) {
393 const CodeGenRegisterClass &RC2 = RegisterClasses[*II];
394 if (!Empty) OS << ", ";
395 OS << "&" << getQualifiedName(RC2.TheDef) << "RegClass";
400 OS << (!Empty ? ", " : "") << "NULL";
405 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i) {
406 const CodeGenRegisterClass &RC = RegisterClasses[i];
407 OS << RC.MethodBodies << "\n";
408 OS << RC.getName() << "Class::" << RC.getName()
409 << "Class() : TargetRegisterClass("
410 << RC.getName() + "RegClassID" << ", "
411 << '\"' << RC.getName() << "\", "
412 << RC.getName() + "VTs" << ", "
413 << RC.getName() + "Subclasses" << ", "
414 << RC.getName() + "Superclasses" << ", "
415 << RC.getName() + "SubRegClasses" << ", "
416 << RC.getName() + "SuperRegClasses" << ", "
417 << RC.SpillSize/8 << ", "
418 << RC.SpillAlignment/8 << ", "
419 << RC.CopyCost << ", "
420 << RC.getName() << ", " << RC.getName() << " + " << RC.Elements.size()
427 OS << "\nnamespace {\n";
428 OS << " const TargetRegisterClass* const RegisterClasses[] = {\n";
429 for (unsigned i = 0, e = RegisterClasses.size(); i != e; ++i)
430 OS << " &" << getQualifiedName(RegisterClasses[i].TheDef)
434 // Emit register sub-registers / super-registers, aliases...
435 std::map<Record*, std::set<Record*>, LessRecord> RegisterSubRegs;
436 std::map<Record*, std::set<Record*>, LessRecord> RegisterSuperRegs;
437 std::map<Record*, std::set<Record*>, LessRecord> RegisterAliases;
438 std::map<Record*, std::vector<std::pair<int, Record*> > > SubRegVectors;
439 typedef std::map<Record*, std::vector<int64_t>, LessRecord> DwarfRegNumsMapTy;
440 DwarfRegNumsMapTy DwarfRegNums;
442 const std::vector<CodeGenRegister> &Regs = Target.getRegisters();
444 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
445 Record *R = Regs[i].TheDef;
446 std::vector<Record*> LI = Regs[i].TheDef->getValueAsListOfDefs("Aliases");
447 // Add information that R aliases all of the elements in the list... and
448 // that everything in the list aliases R.
449 for (unsigned j = 0, e = LI.size(); j != e; ++j) {
451 if (RegisterAliases[R].count(Reg))
452 errs() << "Warning: register alias between " << getQualifiedName(R)
453 << " and " << getQualifiedName(Reg)
454 << " specified multiple times!\n";
455 RegisterAliases[R].insert(Reg);
457 if (RegisterAliases[Reg].count(R))
458 errs() << "Warning: register alias between " << getQualifiedName(R)
459 << " and " << getQualifiedName(Reg)
460 << " specified multiple times!\n";
461 RegisterAliases[Reg].insert(R);
465 // Process sub-register sets.
466 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
467 Record *R = Regs[i].TheDef;
468 std::vector<Record*> LI = Regs[i].TheDef->getValueAsListOfDefs("SubRegs");
469 // Process sub-register set and add aliases information.
470 for (unsigned j = 0, e = LI.size(); j != e; ++j) {
471 Record *SubReg = LI[j];
472 if (RegisterSubRegs[R].count(SubReg))
473 errs() << "Warning: register " << getQualifiedName(SubReg)
474 << " specified as a sub-register of " << getQualifiedName(R)
475 << " multiple times!\n";
476 addSubSuperReg(R, SubReg, RegisterSubRegs, RegisterSuperRegs,
481 // Print the SubregHashTable, a simple quadratically probed
482 // hash table for determining if a register is a subregister
483 // of another register.
484 unsigned NumSubRegs = 0;
485 std::map<Record*, unsigned> RegNo;
486 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
487 RegNo[Regs[i].TheDef] = i;
488 NumSubRegs += RegisterSubRegs[Regs[i].TheDef].size();
491 unsigned SubregHashTableSize = 2 * NextPowerOf2(2 * NumSubRegs);
492 unsigned* SubregHashTable = new unsigned[2 * SubregHashTableSize];
493 std::fill(SubregHashTable, SubregHashTable + 2 * SubregHashTableSize, ~0U);
495 unsigned hashMisses = 0;
497 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
498 Record* R = Regs[i].TheDef;
499 for (std::set<Record*>::iterator I = RegisterSubRegs[R].begin(),
500 E = RegisterSubRegs[R].end(); I != E; ++I) {
502 // We have to increase the indices of both registers by one when
503 // computing the hash because, in the generated code, there
504 // will be an extra empty slot at register 0.
505 size_t index = ((i+1) + (RegNo[RJ]+1) * 37) & (SubregHashTableSize-1);
506 unsigned ProbeAmt = 2;
507 while (SubregHashTable[index*2] != ~0U &&
508 SubregHashTable[index*2+1] != ~0U) {
509 index = (index + ProbeAmt) & (SubregHashTableSize-1);
515 SubregHashTable[index*2] = i;
516 SubregHashTable[index*2+1] = RegNo[RJ];
520 OS << "\n\n // Number of hash collisions: " << hashMisses << "\n";
522 if (SubregHashTableSize) {
523 std::string Namespace = Regs[0].TheDef->getValueAsString("Namespace");
525 OS << " const unsigned SubregHashTable[] = { ";
526 for (unsigned i = 0; i < SubregHashTableSize - 1; ++i) {
528 // Insert spaces for nice formatting.
531 if (SubregHashTable[2*i] != ~0U) {
532 OS << getQualifiedName(Regs[SubregHashTable[2*i]].TheDef) << ", "
533 << getQualifiedName(Regs[SubregHashTable[2*i+1]].TheDef) << ", \n";
535 OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister, \n";
539 unsigned Idx = SubregHashTableSize*2-2;
540 if (SubregHashTable[Idx] != ~0U) {
542 << getQualifiedName(Regs[SubregHashTable[Idx]].TheDef) << ", "
543 << getQualifiedName(Regs[SubregHashTable[Idx+1]].TheDef) << " };\n";
545 OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister };\n";
548 OS << " const unsigned SubregHashTableSize = "
549 << SubregHashTableSize << ";\n";
551 OS << " const unsigned SubregHashTable[] = { ~0U, ~0U };\n"
552 << " const unsigned SubregHashTableSize = 1;\n";
555 delete [] SubregHashTable;
558 // Print the SuperregHashTable, a simple quadratically probed
559 // hash table for determining if a register is a super-register
560 // of another register.
561 unsigned NumSupRegs = 0;
563 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
564 RegNo[Regs[i].TheDef] = i;
565 NumSupRegs += RegisterSuperRegs[Regs[i].TheDef].size();
568 unsigned SuperregHashTableSize = 2 * NextPowerOf2(2 * NumSupRegs);
569 unsigned* SuperregHashTable = new unsigned[2 * SuperregHashTableSize];
570 std::fill(SuperregHashTable, SuperregHashTable + 2 * SuperregHashTableSize, ~0U);
574 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
575 Record* R = Regs[i].TheDef;
576 for (std::set<Record*>::iterator I = RegisterSuperRegs[R].begin(),
577 E = RegisterSuperRegs[R].end(); I != E; ++I) {
579 // We have to increase the indices of both registers by one when
580 // computing the hash because, in the generated code, there
581 // will be an extra empty slot at register 0.
582 size_t index = ((i+1) + (RegNo[RJ]+1) * 37) & (SuperregHashTableSize-1);
583 unsigned ProbeAmt = 2;
584 while (SuperregHashTable[index*2] != ~0U &&
585 SuperregHashTable[index*2+1] != ~0U) {
586 index = (index + ProbeAmt) & (SuperregHashTableSize-1);
592 SuperregHashTable[index*2] = i;
593 SuperregHashTable[index*2+1] = RegNo[RJ];
597 OS << "\n\n // Number of hash collisions: " << hashMisses << "\n";
599 if (SuperregHashTableSize) {
600 std::string Namespace = Regs[0].TheDef->getValueAsString("Namespace");
602 OS << " const unsigned SuperregHashTable[] = { ";
603 for (unsigned i = 0; i < SuperregHashTableSize - 1; ++i) {
605 // Insert spaces for nice formatting.
608 if (SuperregHashTable[2*i] != ~0U) {
609 OS << getQualifiedName(Regs[SuperregHashTable[2*i]].TheDef) << ", "
610 << getQualifiedName(Regs[SuperregHashTable[2*i+1]].TheDef) << ", \n";
612 OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister, \n";
616 unsigned Idx = SuperregHashTableSize*2-2;
617 if (SuperregHashTable[Idx] != ~0U) {
619 << getQualifiedName(Regs[SuperregHashTable[Idx]].TheDef) << ", "
620 << getQualifiedName(Regs[SuperregHashTable[Idx+1]].TheDef) << " };\n";
622 OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister };\n";
625 OS << " const unsigned SuperregHashTableSize = "
626 << SuperregHashTableSize << ";\n";
628 OS << " const unsigned SuperregHashTable[] = { ~0U, ~0U };\n"
629 << " const unsigned SuperregHashTableSize = 1;\n";
632 delete [] SuperregHashTable;
635 // Print the AliasHashTable, a simple quadratically probed
636 // hash table for determining if a register aliases another register.
637 unsigned NumAliases = 0;
639 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
640 RegNo[Regs[i].TheDef] = i;
641 NumAliases += RegisterAliases[Regs[i].TheDef].size();
644 unsigned AliasesHashTableSize = 2 * NextPowerOf2(2 * NumAliases);
645 unsigned* AliasesHashTable = new unsigned[2 * AliasesHashTableSize];
646 std::fill(AliasesHashTable, AliasesHashTable + 2 * AliasesHashTableSize, ~0U);
650 for (unsigned i = 0, e = Regs.size(); i != e; ++i) {
651 Record* R = Regs[i].TheDef;
652 for (std::set<Record*>::iterator I = RegisterAliases[R].begin(),
653 E = RegisterAliases[R].end(); I != E; ++I) {
655 // We have to increase the indices of both registers by one when
656 // computing the hash because, in the generated code, there
657 // will be an extra empty slot at register 0.
658 size_t index = ((i+1) + (RegNo[RJ]+1) * 37) & (AliasesHashTableSize-1);
659 unsigned ProbeAmt = 2;
660 while (AliasesHashTable[index*2] != ~0U &&
661 AliasesHashTable[index*2+1] != ~0U) {
662 index = (index + ProbeAmt) & (AliasesHashTableSize-1);
668 AliasesHashTable[index*2] = i;
669 AliasesHashTable[index*2+1] = RegNo[RJ];
673 OS << "\n\n // Number of hash collisions: " << hashMisses << "\n";
675 if (AliasesHashTableSize) {
676 std::string Namespace = Regs[0].TheDef->getValueAsString("Namespace");
678 OS << " const unsigned AliasesHashTable[] = { ";
679 for (unsigned i = 0; i < AliasesHashTableSize - 1; ++i) {
681 // Insert spaces for nice formatting.
684 if (AliasesHashTable[2*i] != ~0U) {
685 OS << getQualifiedName(Regs[AliasesHashTable[2*i]].TheDef) << ", "
686 << getQualifiedName(Regs[AliasesHashTable[2*i+1]].TheDef) << ", \n";
688 OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister, \n";
692 unsigned Idx = AliasesHashTableSize*2-2;
693 if (AliasesHashTable[Idx] != ~0U) {
695 << getQualifiedName(Regs[AliasesHashTable[Idx]].TheDef) << ", "
696 << getQualifiedName(Regs[AliasesHashTable[Idx+1]].TheDef) << " };\n";
698 OS << Namespace << "::NoRegister, " << Namespace << "::NoRegister };\n";
701 OS << " const unsigned AliasesHashTableSize = "
702 << AliasesHashTableSize << ";\n";
704 OS << " const unsigned AliasesHashTable[] = { ~0U, ~0U };\n"
705 << " const unsigned AliasesHashTableSize = 1;\n";
708 delete [] AliasesHashTable;
710 if (!RegisterAliases.empty())
711 OS << "\n\n // Register Alias Sets...\n";
713 // Emit the empty alias list
714 OS << " const unsigned Empty_AliasSet[] = { 0 };\n";
715 // Loop over all of the registers which have aliases, emitting the alias list
717 for (std::map<Record*, std::set<Record*>, LessRecord >::iterator
718 I = RegisterAliases.begin(), E = RegisterAliases.end(); I != E; ++I) {
719 OS << " const unsigned " << I->first->getName() << "_AliasSet[] = { ";
720 for (std::set<Record*>::iterator ASI = I->second.begin(),
721 E = I->second.end(); ASI != E; ++ASI)
722 OS << getQualifiedName(*ASI) << ", ";
726 if (!RegisterSubRegs.empty())
727 OS << "\n\n // Register Sub-registers Sets...\n";
729 // Emit the empty sub-registers list
730 OS << " const unsigned Empty_SubRegsSet[] = { 0 };\n";
731 // Loop over all of the registers which have sub-registers, emitting the
732 // sub-registers list to memory.
733 for (std::map<Record*, std::set<Record*>, LessRecord>::iterator
734 I = RegisterSubRegs.begin(), E = RegisterSubRegs.end(); I != E; ++I) {
735 OS << " const unsigned " << I->first->getName() << "_SubRegsSet[] = { ";
736 std::vector<Record*> SubRegsVector;
737 for (std::set<Record*>::iterator ASI = I->second.begin(),
738 E = I->second.end(); ASI != E; ++ASI)
739 SubRegsVector.push_back(*ASI);
740 RegisterSorter RS(RegisterSubRegs);
741 std::stable_sort(SubRegsVector.begin(), SubRegsVector.end(), RS);
742 for (unsigned i = 0, e = SubRegsVector.size(); i != e; ++i)
743 OS << getQualifiedName(SubRegsVector[i]) << ", ";
747 if (!RegisterSuperRegs.empty())
748 OS << "\n\n // Register Super-registers Sets...\n";
750 // Emit the empty super-registers list
751 OS << " const unsigned Empty_SuperRegsSet[] = { 0 };\n";
752 // Loop over all of the registers which have super-registers, emitting the
753 // super-registers list to memory.
754 for (std::map<Record*, std::set<Record*>, LessRecord >::iterator
755 I = RegisterSuperRegs.begin(), E = RegisterSuperRegs.end(); I != E; ++I) {
756 OS << " const unsigned " << I->first->getName() << "_SuperRegsSet[] = { ";
758 std::vector<Record*> SuperRegsVector;
759 for (std::set<Record*>::iterator ASI = I->second.begin(),
760 E = I->second.end(); ASI != E; ++ASI)
761 SuperRegsVector.push_back(*ASI);
762 RegisterSorter RS(RegisterSubRegs);
763 std::stable_sort(SuperRegsVector.begin(), SuperRegsVector.end(), RS);
764 for (unsigned i = 0, e = SuperRegsVector.size(); i != e; ++i)
765 OS << getQualifiedName(SuperRegsVector[i]) << ", ";
769 OS<<"\n const TargetRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
770 OS << " { \"NOREG\",\t\"NOREG\",\t0,\t0,\t0 },\n";
772 // Now that register alias and sub-registers sets have been emitted, emit the
773 // register descriptors now.
774 const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
775 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
776 const CodeGenRegister &Reg = Registers[i];
778 if (!Reg.TheDef->getValueAsString("AsmName").empty())
779 OS << Reg.TheDef->getValueAsString("AsmName");
783 OS << Reg.getName() << "\",\t";
784 if (RegisterAliases.count(Reg.TheDef))
785 OS << Reg.getName() << "_AliasSet,\t";
787 OS << "Empty_AliasSet,\t";
788 if (RegisterSubRegs.count(Reg.TheDef))
789 OS << Reg.getName() << "_SubRegsSet,\t";
791 OS << "Empty_SubRegsSet,\t";
792 if (RegisterSuperRegs.count(Reg.TheDef))
793 OS << Reg.getName() << "_SuperRegsSet },\n";
795 OS << "Empty_SuperRegsSet },\n";
797 OS << " };\n"; // End of register descriptors...
798 OS << "}\n\n"; // End of anonymous namespace...
800 std::string ClassName = Target.getName() + "GenRegisterInfo";
802 // Calculate the mapping of subregister+index pairs to physical registers.
803 std::vector<Record*> SubRegs = Records.getAllDerivedDefinitions("SubRegSet");
804 for (unsigned i = 0, e = SubRegs.size(); i != e; ++i) {
805 int subRegIndex = SubRegs[i]->getValueAsInt("index");
806 std::vector<Record*> From = SubRegs[i]->getValueAsListOfDefs("From");
807 std::vector<Record*> To = SubRegs[i]->getValueAsListOfDefs("To");
809 if (From.size() != To.size()) {
810 errs() << "Error: register list and sub-register list not of equal length"
811 << " in SubRegSet\n";
815 // For each entry in from/to vectors, insert the to register at index
816 for (unsigned ii = 0, ee = From.size(); ii != ee; ++ii)
817 SubRegVectors[From[ii]].push_back(std::make_pair(subRegIndex, To[ii]));
820 // Emit the subregister + index mapping function based on the information
822 OS << "unsigned " << ClassName
823 << "::getSubReg(unsigned RegNo, unsigned Index) const {\n"
824 << " switch (RegNo) {\n"
825 << " default:\n return 0;\n";
826 for (std::map<Record*, std::vector<std::pair<int, Record*> > >::iterator
827 I = SubRegVectors.begin(), E = SubRegVectors.end(); I != E; ++I) {
828 OS << " case " << getQualifiedName(I->first) << ":\n";
829 OS << " switch (Index) {\n";
830 OS << " default: return 0;\n";
831 for (unsigned i = 0, e = I->second.size(); i != e; ++i)
832 OS << " case " << (I->second)[i].first << ": return "
833 << getQualifiedName((I->second)[i].second) << ";\n";
834 OS << " };\n" << " break;\n";
837 OS << " return 0;\n";
840 // Emit the constructor of the class...
841 OS << ClassName << "::" << ClassName
842 << "(int CallFrameSetupOpcode, int CallFrameDestroyOpcode)\n"
843 << " : TargetRegisterInfo(RegisterDescriptors, " << Registers.size()+1
844 << ", RegisterClasses, RegisterClasses+" << RegisterClasses.size() <<",\n "
845 << " CallFrameSetupOpcode, CallFrameDestroyOpcode,\n"
846 << " SubregHashTable, SubregHashTableSize,\n"
847 << " SuperregHashTable, SuperregHashTableSize,\n"
848 << " AliasesHashTable, AliasesHashTableSize) {\n"
851 // Collect all information about dwarf register numbers
853 // First, just pull all provided information to the map
854 unsigned maxLength = 0;
855 for (unsigned i = 0, e = Registers.size(); i != e; ++i) {
856 Record *Reg = Registers[i].TheDef;
857 std::vector<int64_t> RegNums = Reg->getValueAsListOfInts("DwarfNumbers");
858 maxLength = std::max((size_t)maxLength, RegNums.size());
859 if (DwarfRegNums.count(Reg))
860 errs() << "Warning: DWARF numbers for register " << getQualifiedName(Reg)
861 << "specified multiple times\n";
862 DwarfRegNums[Reg] = RegNums;
865 // Now we know maximal length of number list. Append -1's, where needed
866 for (DwarfRegNumsMapTy::iterator
867 I = DwarfRegNums.begin(), E = DwarfRegNums.end(); I != E; ++I)
868 for (unsigned i = I->second.size(), e = maxLength; i != e; ++i)
869 I->second.push_back(-1);
871 // Emit information about the dwarf register numbers.
872 OS << "int " << ClassName << "::getDwarfRegNumFull(unsigned RegNum, "
873 << "unsigned Flavour) const {\n"
874 << " switch (Flavour) {\n"
876 << " assert(0 && \"Unknown DWARF flavour\");\n"
879 for (unsigned i = 0, e = maxLength; i != e; ++i) {
880 OS << " case " << i << ":\n"
881 << " switch (RegNum) {\n"
883 << " assert(0 && \"Invalid RegNum\");\n"
886 // Sort by name to get a stable order.
889 for (DwarfRegNumsMapTy::iterator
890 I = DwarfRegNums.begin(), E = DwarfRegNums.end(); I != E; ++I) {
891 int RegNo = I->second[i];
893 OS << " case " << getQualifiedName(I->first) << ":\n"
894 << " return " << RegNo << ";\n";
896 OS << " case " << getQualifiedName(I->first) << ":\n"
897 << " assert(0 && \"Invalid register for this mode\");\n"
905 OS << "} // End llvm namespace \n";