1 //===- DAGISelEmitter.cpp - Generate an instruction selector --------------===//
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 emits a DAG instruction selector.
12 //===----------------------------------------------------------------------===//
14 #include "DAGISelEmitter.h"
16 #include "llvm/ADT/StringExtras.h"
17 #include "llvm/Support/CommandLine.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/MathExtras.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/Streams.h"
28 GenDebug("gen-debug", cl::desc("Generate debug code"),
32 //===----------------------------------------------------------------------===//
33 // DAGISelEmitter Helper methods
36 /// NodeIsComplexPattern - return true if N is a leaf node and a subclass of
38 static bool NodeIsComplexPattern(TreePatternNode *N) {
39 return (N->isLeaf() &&
40 dynamic_cast<DefInit*>(N->getLeafValue()) &&
41 static_cast<DefInit*>(N->getLeafValue())->getDef()->
42 isSubClassOf("ComplexPattern"));
45 /// NodeGetComplexPattern - return the pointer to the ComplexPattern if N
46 /// is a leaf node and a subclass of ComplexPattern, else it returns NULL.
47 static const ComplexPattern *NodeGetComplexPattern(TreePatternNode *N,
48 CodeGenDAGPatterns &CGP) {
50 dynamic_cast<DefInit*>(N->getLeafValue()) &&
51 static_cast<DefInit*>(N->getLeafValue())->getDef()->
52 isSubClassOf("ComplexPattern")) {
53 return &CGP.getComplexPattern(static_cast<DefInit*>(N->getLeafValue())
59 /// getPatternSize - Return the 'size' of this pattern. We want to match large
60 /// patterns before small ones. This is used to determine the size of a
62 static unsigned getPatternSize(TreePatternNode *P, CodeGenDAGPatterns &CGP) {
63 assert((EMVT::isExtIntegerInVTs(P->getExtTypes()) ||
64 EMVT::isExtFloatingPointInVTs(P->getExtTypes()) ||
65 P->getExtTypeNum(0) == MVT::isVoid ||
66 P->getExtTypeNum(0) == MVT::Flag ||
67 P->getExtTypeNum(0) == MVT::iPTR ||
68 P->getExtTypeNum(0) == MVT::iPTRAny) &&
69 "Not a valid pattern node to size!");
70 unsigned Size = 3; // The node itself.
71 // If the root node is a ConstantSDNode, increases its size.
72 // e.g. (set R32:$dst, 0).
73 if (P->isLeaf() && dynamic_cast<IntInit*>(P->getLeafValue()))
76 // FIXME: This is a hack to statically increase the priority of patterns
77 // which maps a sub-dag to a complex pattern. e.g. favors LEA over ADD.
78 // Later we can allow complexity / cost for each pattern to be (optionally)
79 // specified. To get best possible pattern match we'll need to dynamically
80 // calculate the complexity of all patterns a dag can potentially map to.
81 const ComplexPattern *AM = NodeGetComplexPattern(P, CGP);
83 Size += AM->getNumOperands() * 3;
85 // If this node has some predicate function that must match, it adds to the
86 // complexity of this node.
87 if (!P->getPredicateFns().empty())
90 // Count children in the count if they are also nodes.
91 for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i) {
92 TreePatternNode *Child = P->getChild(i);
93 if (!Child->isLeaf() && Child->getExtTypeNum(0) != MVT::Other)
94 Size += getPatternSize(Child, CGP);
95 else if (Child->isLeaf()) {
96 if (dynamic_cast<IntInit*>(Child->getLeafValue()))
97 Size += 5; // Matches a ConstantSDNode (+3) and a specific value (+2).
98 else if (NodeIsComplexPattern(Child))
99 Size += getPatternSize(Child, CGP);
100 else if (!Child->getPredicateFns().empty())
108 /// getResultPatternCost - Compute the number of instructions for this pattern.
109 /// This is a temporary hack. We should really include the instruction
110 /// latencies in this calculation.
111 static unsigned getResultPatternCost(TreePatternNode *P,
112 CodeGenDAGPatterns &CGP) {
113 if (P->isLeaf()) return 0;
116 Record *Op = P->getOperator();
117 if (Op->isSubClassOf("Instruction")) {
119 CodeGenInstruction &II = CGP.getTargetInfo().getInstruction(Op->getName());
120 if (II.usesCustomDAGSchedInserter)
123 for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i)
124 Cost += getResultPatternCost(P->getChild(i), CGP);
128 /// getResultPatternCodeSize - Compute the code size of instructions for this
130 static unsigned getResultPatternSize(TreePatternNode *P,
131 CodeGenDAGPatterns &CGP) {
132 if (P->isLeaf()) return 0;
135 Record *Op = P->getOperator();
136 if (Op->isSubClassOf("Instruction")) {
137 Cost += Op->getValueAsInt("CodeSize");
139 for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i)
140 Cost += getResultPatternSize(P->getChild(i), CGP);
144 // PatternSortingPredicate - return true if we prefer to match LHS before RHS.
145 // In particular, we want to match maximal patterns first and lowest cost within
146 // a particular complexity first.
147 struct PatternSortingPredicate {
148 PatternSortingPredicate(CodeGenDAGPatterns &cgp) : CGP(cgp) {}
149 CodeGenDAGPatterns &CGP;
151 typedef std::pair<unsigned, std::string> CodeLine;
152 typedef std::vector<CodeLine> CodeList;
153 typedef std::vector<std::pair<const PatternToMatch*, CodeList> > PatternList;
155 bool operator()(const std::pair<const PatternToMatch*, CodeList> &LHSPair,
156 const std::pair<const PatternToMatch*, CodeList> &RHSPair) {
157 const PatternToMatch *LHS = LHSPair.first;
158 const PatternToMatch *RHS = RHSPair.first;
160 unsigned LHSSize = getPatternSize(LHS->getSrcPattern(), CGP);
161 unsigned RHSSize = getPatternSize(RHS->getSrcPattern(), CGP);
162 LHSSize += LHS->getAddedComplexity();
163 RHSSize += RHS->getAddedComplexity();
164 if (LHSSize > RHSSize) return true; // LHS -> bigger -> less cost
165 if (LHSSize < RHSSize) return false;
167 // If the patterns have equal complexity, compare generated instruction cost
168 unsigned LHSCost = getResultPatternCost(LHS->getDstPattern(), CGP);
169 unsigned RHSCost = getResultPatternCost(RHS->getDstPattern(), CGP);
170 if (LHSCost < RHSCost) return true;
171 if (LHSCost > RHSCost) return false;
173 return getResultPatternSize(LHS->getDstPattern(), CGP) <
174 getResultPatternSize(RHS->getDstPattern(), CGP);
178 /// getRegisterValueType - Look up and return the first ValueType of specified
179 /// RegisterClass record
180 static MVT::SimpleValueType getRegisterValueType(Record *R, const CodeGenTarget &T) {
181 if (const CodeGenRegisterClass *RC = T.getRegisterClassForRegister(R))
182 return RC->getValueTypeNum(0);
187 /// RemoveAllTypes - A quick recursive walk over a pattern which removes all
188 /// type information from it.
189 static void RemoveAllTypes(TreePatternNode *N) {
192 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i)
193 RemoveAllTypes(N->getChild(i));
196 /// NodeHasProperty - return true if TreePatternNode has the specified
198 static bool NodeHasProperty(TreePatternNode *N, SDNP Property,
199 CodeGenDAGPatterns &CGP) {
201 const ComplexPattern *CP = NodeGetComplexPattern(N, CGP);
203 return CP->hasProperty(Property);
206 Record *Operator = N->getOperator();
207 if (!Operator->isSubClassOf("SDNode")) return false;
209 return CGP.getSDNodeInfo(Operator).hasProperty(Property);
212 static bool PatternHasProperty(TreePatternNode *N, SDNP Property,
213 CodeGenDAGPatterns &CGP) {
214 if (NodeHasProperty(N, Property, CGP))
217 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i) {
218 TreePatternNode *Child = N->getChild(i);
219 if (PatternHasProperty(Child, Property, CGP))
226 static std::string getOpcodeName(Record *Op, CodeGenDAGPatterns &CGP) {
227 return CGP.getSDNodeInfo(Op).getEnumName();
231 bool DisablePatternForFastISel(TreePatternNode *N, CodeGenDAGPatterns &CGP) {
232 bool isStore = !N->isLeaf() &&
233 getOpcodeName(N->getOperator(), CGP) == "ISD::STORE";
234 if (!isStore && NodeHasProperty(N, SDNPHasChain, CGP))
237 bool HasChain = false;
238 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i) {
239 TreePatternNode *Child = N->getChild(i);
240 if (PatternHasProperty(Child, SDNPHasChain, CGP)) {
248 //===----------------------------------------------------------------------===//
249 // Node Transformation emitter implementation.
251 void DAGISelEmitter::EmitNodeTransforms(std::ostream &OS) {
252 // Walk the pattern fragments, adding them to a map, which sorts them by
254 typedef std::map<std::string, CodeGenDAGPatterns::NodeXForm> NXsByNameTy;
255 NXsByNameTy NXsByName;
257 for (CodeGenDAGPatterns::nx_iterator I = CGP.nx_begin(), E = CGP.nx_end();
259 NXsByName.insert(std::make_pair(I->first->getName(), I->second));
261 OS << "\n// Node transformations.\n";
263 for (NXsByNameTy::iterator I = NXsByName.begin(), E = NXsByName.end();
265 Record *SDNode = I->second.first;
266 std::string Code = I->second.second;
268 if (Code.empty()) continue; // Empty code? Skip it.
270 std::string ClassName = CGP.getSDNodeInfo(SDNode).getSDClassName();
271 const char *C2 = ClassName == "SDNode" ? "N" : "inN";
273 OS << "inline SDValue Transform_" << I->first << "(SDNode *" << C2
275 if (ClassName != "SDNode")
276 OS << " " << ClassName << " *N = cast<" << ClassName << ">(inN);\n";
277 OS << Code << "\n}\n";
281 //===----------------------------------------------------------------------===//
282 // Predicate emitter implementation.
285 void DAGISelEmitter::EmitPredicateFunctions(std::ostream &OS) {
286 OS << "\n// Predicate functions.\n";
288 // Walk the pattern fragments, adding them to a map, which sorts them by
290 typedef std::map<std::string, std::pair<Record*, TreePattern*> > PFsByNameTy;
291 PFsByNameTy PFsByName;
293 for (CodeGenDAGPatterns::pf_iterator I = CGP.pf_begin(), E = CGP.pf_end();
295 PFsByName.insert(std::make_pair(I->first->getName(), *I));
298 for (PFsByNameTy::iterator I = PFsByName.begin(), E = PFsByName.end();
300 Record *PatFragRecord = I->second.first;// Record that derives from PatFrag.
301 TreePattern *P = I->second.second;
303 // If there is a code init for this fragment, emit the predicate code.
304 std::string Code = PatFragRecord->getValueAsCode("Predicate");
305 if (Code.empty()) continue;
307 if (P->getOnlyTree()->isLeaf())
308 OS << "inline bool Predicate_" << PatFragRecord->getName()
309 << "(SDNode *N) {\n";
311 std::string ClassName =
312 CGP.getSDNodeInfo(P->getOnlyTree()->getOperator()).getSDClassName();
313 const char *C2 = ClassName == "SDNode" ? "N" : "inN";
315 OS << "inline bool Predicate_" << PatFragRecord->getName()
316 << "(SDNode *" << C2 << ") {\n";
317 if (ClassName != "SDNode")
318 OS << " " << ClassName << " *N = cast<" << ClassName << ">(inN);\n";
320 OS << Code << "\n}\n";
327 //===----------------------------------------------------------------------===//
328 // PatternCodeEmitter implementation.
330 class PatternCodeEmitter {
332 CodeGenDAGPatterns &CGP;
335 std::string PredicateCheck;
338 // Instruction selector pattern.
339 TreePatternNode *Pattern;
340 // Matched instruction.
341 TreePatternNode *Instruction;
343 // Node to name mapping
344 std::map<std::string, std::string> VariableMap;
345 // Node to operator mapping
346 std::map<std::string, Record*> OperatorMap;
347 // Name of the folded node which produces a flag.
348 std::pair<std::string, unsigned> FoldedFlag;
349 // Names of all the folded nodes which produce chains.
350 std::vector<std::pair<std::string, unsigned> > FoldedChains;
351 // Original input chain(s).
352 std::vector<std::pair<std::string, std::string> > OrigChains;
353 std::set<std::string> Duplicates;
355 /// LSI - Load/Store information.
356 /// Save loads/stores matched by a pattern, and generate a MemOperandSDNode
357 /// for each memory access. This facilitates the use of AliasAnalysis in
359 std::vector<std::string> LSI;
361 /// GeneratedCode - This is the buffer that we emit code to. The first int
362 /// indicates whether this is an exit predicate (something that should be
363 /// tested, and if true, the match fails) [when 1], or normal code to emit
364 /// [when 0], or initialization code to emit [when 2].
365 std::vector<std::pair<unsigned, std::string> > &GeneratedCode;
366 /// GeneratedDecl - This is the set of all SDValue declarations needed for
367 /// the set of patterns for each top-level opcode.
368 std::set<std::string> &GeneratedDecl;
369 /// TargetOpcodes - The target specific opcodes used by the resulting
371 std::vector<std::string> &TargetOpcodes;
372 std::vector<std::string> &TargetVTs;
373 /// OutputIsVariadic - Records whether the instruction output pattern uses
374 /// variable_ops. This requires that the Emit function be passed an
375 /// additional argument to indicate where the input varargs operands
377 bool &OutputIsVariadic;
378 /// NumInputRootOps - Records the number of operands the root node of the
379 /// input pattern has. This information is used in the generated code to
380 /// pass to Emit functions when variable_ops processing is needed.
381 unsigned &NumInputRootOps;
383 std::string ChainName;
388 void emitCheck(const std::string &S) {
390 GeneratedCode.push_back(std::make_pair(1, S));
392 void emitCode(const std::string &S) {
394 GeneratedCode.push_back(std::make_pair(0, S));
396 void emitInit(const std::string &S) {
398 GeneratedCode.push_back(std::make_pair(2, S));
400 void emitDecl(const std::string &S) {
401 assert(!S.empty() && "Invalid declaration");
402 GeneratedDecl.insert(S);
404 void emitOpcode(const std::string &Opc) {
405 TargetOpcodes.push_back(Opc);
408 void emitVT(const std::string &VT) {
409 TargetVTs.push_back(VT);
413 PatternCodeEmitter(CodeGenDAGPatterns &cgp, std::string predcheck,
414 TreePatternNode *pattern, TreePatternNode *instr,
415 std::vector<std::pair<unsigned, std::string> > &gc,
416 std::set<std::string> &gd,
417 std::vector<std::string> &to,
418 std::vector<std::string> &tv,
421 : CGP(cgp), PredicateCheck(predcheck), Pattern(pattern), Instruction(instr),
422 GeneratedCode(gc), GeneratedDecl(gd),
423 TargetOpcodes(to), TargetVTs(tv),
424 OutputIsVariadic(oiv), NumInputRootOps(niro),
425 TmpNo(0), OpcNo(0), VTNo(0) {}
427 /// EmitMatchCode - Emit a matcher for N, going to the label for PatternNo
428 /// if the match fails. At this point, we already know that the opcode for N
429 /// matches, and the SDNode for the result has the RootName specified name.
430 void EmitMatchCode(TreePatternNode *N, TreePatternNode *P,
431 const std::string &RootName, const std::string &ChainSuffix,
434 // Save loads/stores matched by a pattern.
435 if (!N->isLeaf() && N->getName().empty()) {
436 if (NodeHasProperty(N, SDNPMemOperand, CGP))
437 LSI.push_back(RootName);
440 bool isRoot = (P == NULL);
441 // Emit instruction predicates. Each predicate is just a string for now.
443 // Record input varargs info.
444 NumInputRootOps = N->getNumChildren();
446 if (DisablePatternForFastISel(N, CGP))
449 emitCheck(PredicateCheck);
453 if (IntInit *II = dynamic_cast<IntInit*>(N->getLeafValue())) {
454 emitCheck("cast<ConstantSDNode>(" + RootName +
455 ")->getSExtValue() == INT64_C(" +
456 itostr(II->getValue()) + ")");
458 } else if (!NodeIsComplexPattern(N)) {
459 assert(0 && "Cannot match this as a leaf value!");
464 // If this node has a name associated with it, capture it in VariableMap. If
465 // we already saw this in the pattern, emit code to verify dagness.
466 if (!N->getName().empty()) {
467 std::string &VarMapEntry = VariableMap[N->getName()];
468 if (VarMapEntry.empty()) {
469 VarMapEntry = RootName;
471 // If we get here, this is a second reference to a specific name. Since
472 // we already have checked that the first reference is valid, we don't
473 // have to recursively match it, just check that it's the same as the
474 // previously named thing.
475 emitCheck(VarMapEntry + " == " + RootName);
480 OperatorMap[N->getName()] = N->getOperator();
484 // Emit code to load the child nodes and match their contents recursively.
486 bool NodeHasChain = NodeHasProperty (N, SDNPHasChain, CGP);
487 bool HasChain = PatternHasProperty(N, SDNPHasChain, CGP);
488 bool EmittedUseCheck = false;
493 // Multiple uses of actual result?
494 emitCheck(RootName + ".hasOneUse()");
495 EmittedUseCheck = true;
497 // If the immediate use can somehow reach this node through another
498 // path, then can't fold it either or it will create a cycle.
499 // e.g. In the following diagram, XX can reach ld through YY. If
500 // ld is folded into XX, then YY is both a predecessor and a successor
510 bool NeedCheck = P != Pattern;
512 const SDNodeInfo &PInfo = CGP.getSDNodeInfo(P->getOperator());
514 P->getOperator() == CGP.get_intrinsic_void_sdnode() ||
515 P->getOperator() == CGP.get_intrinsic_w_chain_sdnode() ||
516 P->getOperator() == CGP.get_intrinsic_wo_chain_sdnode() ||
517 PInfo.getNumOperands() > 1 ||
518 PInfo.hasProperty(SDNPHasChain) ||
519 PInfo.hasProperty(SDNPInFlag) ||
520 PInfo.hasProperty(SDNPOptInFlag);
524 std::string ParentName(RootName.begin(), RootName.end()-1);
525 emitCheck("IsLegalAndProfitableToFold(" + RootName +
526 ".getNode(), " + ParentName + ".getNode(), N.getNode())");
533 emitCheck("(" + ChainName + ".getNode() == " + RootName + ".getNode() || "
534 "IsChainCompatible(" + ChainName + ".getNode(), " +
535 RootName + ".getNode()))");
536 OrigChains.push_back(std::make_pair(ChainName, RootName));
539 ChainName = "Chain" + ChainSuffix;
540 emitInit("SDValue " + ChainName + " = " + RootName +
545 // Don't fold any node which reads or writes a flag and has multiple uses.
546 // FIXME: We really need to separate the concepts of flag and "glue". Those
547 // real flag results, e.g. X86CMP output, can have multiple uses.
548 // FIXME: If the optional incoming flag does not exist. Then it is ok to
551 (PatternHasProperty(N, SDNPInFlag, CGP) ||
552 PatternHasProperty(N, SDNPOptInFlag, CGP) ||
553 PatternHasProperty(N, SDNPOutFlag, CGP))) {
554 if (!EmittedUseCheck) {
555 // Multiple uses of actual result?
556 emitCheck(RootName + ".hasOneUse()");
560 // If there are node predicates for this, emit the calls.
561 for (unsigned i = 0, e = N->getPredicateFns().size(); i != e; ++i)
562 emitCheck(N->getPredicateFns()[i] + "(" + RootName + ".getNode())");
564 // If this is an 'and R, 1234' where the operation is AND/OR and the RHS is
565 // a constant without a predicate fn that has more that one bit set, handle
566 // this as a special case. This is usually for targets that have special
567 // handling of certain large constants (e.g. alpha with it's 8/16/32-bit
568 // handling stuff). Using these instructions is often far more efficient
569 // than materializing the constant. Unfortunately, both the instcombiner
570 // and the dag combiner can often infer that bits are dead, and thus drop
571 // them from the mask in the dag. For example, it might turn 'AND X, 255'
572 // into 'AND X, 254' if it knows the low bit is set. Emit code that checks
575 (N->getOperator()->getName() == "and" ||
576 N->getOperator()->getName() == "or") &&
577 N->getChild(1)->isLeaf() &&
578 N->getChild(1)->getPredicateFns().empty()) {
579 if (IntInit *II = dynamic_cast<IntInit*>(N->getChild(1)->getLeafValue())) {
580 if (!isPowerOf2_32(II->getValue())) { // Don't bother with single bits.
581 emitInit("SDValue " + RootName + "0" + " = " +
582 RootName + ".getOperand(" + utostr(0) + ");");
583 emitInit("SDValue " + RootName + "1" + " = " +
584 RootName + ".getOperand(" + utostr(1) + ");");
586 unsigned NTmp = TmpNo++;
587 emitCode("ConstantSDNode *Tmp" + utostr(NTmp) +
588 " = dyn_cast<ConstantSDNode>(" + RootName + "1);");
589 emitCheck("Tmp" + utostr(NTmp));
590 const char *MaskPredicate = N->getOperator()->getName() == "or"
591 ? "CheckOrMask(" : "CheckAndMask(";
592 emitCheck(MaskPredicate + RootName + "0, Tmp" + utostr(NTmp) +
593 ", INT64_C(" + itostr(II->getValue()) + "))");
595 EmitChildMatchCode(N->getChild(0), N, RootName + utostr(0), RootName,
596 ChainSuffix + utostr(0), FoundChain);
602 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
603 emitInit("SDValue " + RootName + utostr(OpNo) + " = " +
604 RootName + ".getOperand(" +utostr(OpNo) + ");");
606 EmitChildMatchCode(N->getChild(i), N, RootName + utostr(OpNo), RootName,
607 ChainSuffix + utostr(OpNo), FoundChain);
610 // Handle cases when root is a complex pattern.
611 const ComplexPattern *CP;
612 if (isRoot && N->isLeaf() && (CP = NodeGetComplexPattern(N, CGP))) {
613 std::string Fn = CP->getSelectFunc();
614 unsigned NumOps = CP->getNumOperands();
615 for (unsigned i = 0; i < NumOps; ++i) {
616 emitDecl("CPTmp" + utostr(i));
617 emitCode("SDValue CPTmp" + utostr(i) + ";");
619 if (CP->hasProperty(SDNPHasChain)) {
620 emitDecl("CPInChain");
621 emitDecl("Chain" + ChainSuffix);
622 emitCode("SDValue CPInChain;");
623 emitCode("SDValue Chain" + ChainSuffix + ";");
626 std::string Code = Fn + "(" + RootName + ", " + RootName;
627 for (unsigned i = 0; i < NumOps; i++)
628 Code += ", CPTmp" + utostr(i);
629 if (CP->hasProperty(SDNPHasChain)) {
630 ChainName = "Chain" + ChainSuffix;
631 Code += ", CPInChain, Chain" + ChainSuffix;
633 emitCheck(Code + ")");
637 void EmitChildMatchCode(TreePatternNode *Child, TreePatternNode *Parent,
638 const std::string &RootName,
639 const std::string &ParentRootName,
640 const std::string &ChainSuffix, bool &FoundChain) {
641 if (!Child->isLeaf()) {
642 // If it's not a leaf, recursively match.
643 const SDNodeInfo &CInfo = CGP.getSDNodeInfo(Child->getOperator());
644 emitCheck(RootName + ".getOpcode() == " +
645 CInfo.getEnumName());
646 EmitMatchCode(Child, Parent, RootName, ChainSuffix, FoundChain);
647 bool HasChain = false;
648 if (NodeHasProperty(Child, SDNPHasChain, CGP)) {
650 FoldedChains.push_back(std::make_pair(RootName, CInfo.getNumResults()));
652 if (NodeHasProperty(Child, SDNPOutFlag, CGP)) {
653 assert(FoldedFlag.first == "" && FoldedFlag.second == 0 &&
654 "Pattern folded multiple nodes which produce flags?");
655 FoldedFlag = std::make_pair(RootName,
656 CInfo.getNumResults() + (unsigned)HasChain);
659 // If this child has a name associated with it, capture it in VarMap. If
660 // we already saw this in the pattern, emit code to verify dagness.
661 if (!Child->getName().empty()) {
662 std::string &VarMapEntry = VariableMap[Child->getName()];
663 if (VarMapEntry.empty()) {
664 VarMapEntry = RootName;
666 // If we get here, this is a second reference to a specific name.
667 // Since we already have checked that the first reference is valid,
668 // we don't have to recursively match it, just check that it's the
669 // same as the previously named thing.
670 emitCheck(VarMapEntry + " == " + RootName);
671 Duplicates.insert(RootName);
676 // Handle leaves of various types.
677 if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
678 Record *LeafRec = DI->getDef();
679 if (LeafRec->isSubClassOf("RegisterClass") ||
680 LeafRec->getName() == "ptr_rc") {
681 // Handle register references. Nothing to do here.
682 } else if (LeafRec->isSubClassOf("Register")) {
683 // Handle register references.
684 } else if (LeafRec->isSubClassOf("ComplexPattern")) {
685 // Handle complex pattern.
686 const ComplexPattern *CP = NodeGetComplexPattern(Child, CGP);
687 std::string Fn = CP->getSelectFunc();
688 unsigned NumOps = CP->getNumOperands();
689 for (unsigned i = 0; i < NumOps; ++i) {
690 emitDecl("CPTmp" + utostr(i));
691 emitCode("SDValue CPTmp" + utostr(i) + ";");
693 if (CP->hasProperty(SDNPHasChain)) {
694 const SDNodeInfo &PInfo = CGP.getSDNodeInfo(Parent->getOperator());
695 FoldedChains.push_back(std::make_pair("CPInChain",
696 PInfo.getNumResults()));
697 ChainName = "Chain" + ChainSuffix;
698 emitDecl("CPInChain");
700 emitCode("SDValue CPInChain;");
701 emitCode("SDValue " + ChainName + ";");
704 std::string Code = Fn + "(";
705 if (CP->hasAttribute(CPAttrParentAsRoot)) {
706 Code += ParentRootName + ", ";
710 if (CP->hasProperty(SDNPHasChain)) {
711 std::string ParentName(RootName.begin(), RootName.end()-1);
712 Code += ParentName + ", ";
715 for (unsigned i = 0; i < NumOps; i++)
716 Code += ", CPTmp" + utostr(i);
717 if (CP->hasProperty(SDNPHasChain))
718 Code += ", CPInChain, Chain" + ChainSuffix;
719 emitCheck(Code + ")");
720 } else if (LeafRec->getName() == "srcvalue") {
721 // Place holder for SRCVALUE nodes. Nothing to do here.
722 } else if (LeafRec->isSubClassOf("ValueType")) {
723 // Make sure this is the specified value type.
724 emitCheck("cast<VTSDNode>(" + RootName +
725 ")->getVT() == MVT::" + LeafRec->getName());
726 } else if (LeafRec->isSubClassOf("CondCode")) {
727 // Make sure this is the specified cond code.
728 emitCheck("cast<CondCodeSDNode>(" + RootName +
729 ")->get() == ISD::" + LeafRec->getName());
735 assert(0 && "Unknown leaf type!");
738 // If there are node predicates for this, emit the calls.
739 for (unsigned i = 0, e = Child->getPredicateFns().size(); i != e; ++i)
740 emitCheck(Child->getPredicateFns()[i] + "(" + RootName +
742 } else if (IntInit *II =
743 dynamic_cast<IntInit*>(Child->getLeafValue())) {
744 unsigned NTmp = TmpNo++;
745 emitCode("ConstantSDNode *Tmp"+ utostr(NTmp) +
746 " = dyn_cast<ConstantSDNode>("+
748 emitCheck("Tmp" + utostr(NTmp));
749 unsigned CTmp = TmpNo++;
750 emitCode("int64_t CN"+ utostr(CTmp) +
751 " = Tmp" + utostr(NTmp) + "->getSExtValue();");
752 emitCheck("CN" + utostr(CTmp) + " == "
753 "INT64_C(" +itostr(II->getValue()) + ")");
758 assert(0 && "Unknown leaf type!");
763 /// EmitResultCode - Emit the action for a pattern. Now that it has matched
764 /// we actually have to build a DAG!
765 std::vector<std::string>
766 EmitResultCode(TreePatternNode *N, std::vector<Record*> DstRegs,
767 bool InFlagDecled, bool ResNodeDecled,
768 bool LikeLeaf = false, bool isRoot = false) {
769 // List of arguments of getTargetNode() or SelectNodeTo().
770 std::vector<std::string> NodeOps;
771 // This is something selected from the pattern we matched.
772 if (!N->getName().empty()) {
773 const std::string &VarName = N->getName();
774 std::string Val = VariableMap[VarName];
775 bool ModifiedVal = false;
777 cerr << "Variable '" << VarName << " referenced but not defined "
778 << "and not caught earlier!\n";
781 if (Val[0] == 'T' && Val[1] == 'm' && Val[2] == 'p') {
782 // Already selected this operand, just return the tmpval.
783 NodeOps.push_back(Val);
787 const ComplexPattern *CP;
788 unsigned ResNo = TmpNo++;
789 if (!N->isLeaf() && N->getOperator()->getName() == "imm") {
790 assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
791 std::string CastType;
792 std::string TmpVar = "Tmp" + utostr(ResNo);
793 switch (N->getTypeNum(0)) {
795 cerr << "Cannot handle " << getEnumName(N->getTypeNum(0))
796 << " type as an immediate constant. Aborting\n";
798 case MVT::i1: CastType = "bool"; break;
799 case MVT::i8: CastType = "unsigned char"; break;
800 case MVT::i16: CastType = "unsigned short"; break;
801 case MVT::i32: CastType = "unsigned"; break;
802 case MVT::i64: CastType = "uint64_t"; break;
804 emitCode("SDValue " + TmpVar +
805 " = CurDAG->getTargetConstant(((" + CastType +
806 ") cast<ConstantSDNode>(" + Val + ")->getZExtValue()), " +
807 getEnumName(N->getTypeNum(0)) + ");");
808 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select this
809 // value if used multiple times by this pattern result.
812 NodeOps.push_back(Val);
813 } else if (!N->isLeaf() && N->getOperator()->getName() == "fpimm") {
814 assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
815 std::string TmpVar = "Tmp" + utostr(ResNo);
816 emitCode("SDValue " + TmpVar +
817 " = CurDAG->getTargetConstantFP(*cast<ConstantFPSDNode>(" +
818 Val + ")->getConstantFPValue(), cast<ConstantFPSDNode>(" +
819 Val + ")->getValueType(0));");
820 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select this
821 // value if used multiple times by this pattern result.
824 NodeOps.push_back(Val);
825 } else if (!N->isLeaf() && N->getOperator()->getName() == "texternalsym"){
826 Record *Op = OperatorMap[N->getName()];
827 // Transform ExternalSymbol to TargetExternalSymbol
828 if (Op && Op->getName() == "externalsym") {
829 std::string TmpVar = "Tmp"+utostr(ResNo);
830 emitCode("SDValue " + TmpVar + " = CurDAG->getTarget"
831 "ExternalSymbol(cast<ExternalSymbolSDNode>(" +
832 Val + ")->getSymbol(), " +
833 getEnumName(N->getTypeNum(0)) + ");");
834 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select
835 // this value if used multiple times by this pattern result.
839 NodeOps.push_back(Val);
840 } else if (!N->isLeaf() && (N->getOperator()->getName() == "tglobaladdr"
841 || N->getOperator()->getName() == "tglobaltlsaddr")) {
842 Record *Op = OperatorMap[N->getName()];
843 // Transform GlobalAddress to TargetGlobalAddress
844 if (Op && (Op->getName() == "globaladdr" ||
845 Op->getName() == "globaltlsaddr")) {
846 std::string TmpVar = "Tmp" + utostr(ResNo);
847 emitCode("SDValue " + TmpVar + " = CurDAG->getTarget"
848 "GlobalAddress(cast<GlobalAddressSDNode>(" + Val +
849 ")->getGlobal(), " + getEnumName(N->getTypeNum(0)) +
851 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select
852 // this value if used multiple times by this pattern result.
856 NodeOps.push_back(Val);
857 } else if (!N->isLeaf()
858 && (N->getOperator()->getName() == "texternalsym"
859 || N->getOperator()->getName() == "tconstpool")) {
860 // Do not rewrite the variable name, since we don't generate a new
862 NodeOps.push_back(Val);
863 } else if (N->isLeaf() && (CP = NodeGetComplexPattern(N, CGP))) {
864 for (unsigned i = 0; i < CP->getNumOperands(); ++i) {
865 NodeOps.push_back("CPTmp" + utostr(i));
868 // This node, probably wrapped in a SDNodeXForm, behaves like a leaf
869 // node even if it isn't one. Don't select it.
871 if (isRoot && N->isLeaf()) {
872 emitCode("ReplaceUses(N, " + Val + ");");
873 emitCode("return NULL;");
876 NodeOps.push_back(Val);
880 VariableMap[VarName] = Val;
885 // If this is an explicit register reference, handle it.
886 if (DefInit *DI = dynamic_cast<DefInit*>(N->getLeafValue())) {
887 unsigned ResNo = TmpNo++;
888 if (DI->getDef()->isSubClassOf("Register")) {
889 emitCode("SDValue Tmp" + utostr(ResNo) + " = CurDAG->getRegister(" +
890 getQualifiedName(DI->getDef()) + ", " +
891 getEnumName(N->getTypeNum(0)) + ");");
892 NodeOps.push_back("Tmp" + utostr(ResNo));
894 } else if (DI->getDef()->getName() == "zero_reg") {
895 emitCode("SDValue Tmp" + utostr(ResNo) +
896 " = CurDAG->getRegister(0, " +
897 getEnumName(N->getTypeNum(0)) + ");");
898 NodeOps.push_back("Tmp" + utostr(ResNo));
901 } else if (IntInit *II = dynamic_cast<IntInit*>(N->getLeafValue())) {
902 unsigned ResNo = TmpNo++;
903 assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
904 emitCode("SDValue Tmp" + utostr(ResNo) +
905 " = CurDAG->getTargetConstant(0x" + itohexstr(II->getValue()) +
906 "ULL, " + getEnumName(N->getTypeNum(0)) + ");");
907 NodeOps.push_back("Tmp" + utostr(ResNo));
914 assert(0 && "Unknown leaf type!");
918 Record *Op = N->getOperator();
919 if (Op->isSubClassOf("Instruction")) {
920 const CodeGenTarget &CGT = CGP.getTargetInfo();
921 CodeGenInstruction &II = CGT.getInstruction(Op->getName());
922 const DAGInstruction &Inst = CGP.getInstruction(Op);
923 const TreePattern *InstPat = Inst.getPattern();
924 // FIXME: Assume actual pattern comes before "implicit".
925 TreePatternNode *InstPatNode =
926 isRoot ? (InstPat ? InstPat->getTree(0) : Pattern)
927 : (InstPat ? InstPat->getTree(0) : NULL);
928 if (InstPatNode && InstPatNode->getOperator()->getName() == "set") {
929 InstPatNode = InstPatNode->getChild(InstPatNode->getNumChildren()-1);
931 bool IsVariadic = isRoot && II.isVariadic;
932 // FIXME: fix how we deal with physical register operands.
933 bool HasImpInputs = isRoot && Inst.getNumImpOperands() > 0;
934 bool HasImpResults = isRoot && DstRegs.size() > 0;
935 bool NodeHasOptInFlag = isRoot &&
936 PatternHasProperty(Pattern, SDNPOptInFlag, CGP);
937 bool NodeHasInFlag = isRoot &&
938 PatternHasProperty(Pattern, SDNPInFlag, CGP);
939 bool NodeHasOutFlag = isRoot &&
940 PatternHasProperty(Pattern, SDNPOutFlag, CGP);
941 bool NodeHasChain = InstPatNode &&
942 PatternHasProperty(InstPatNode, SDNPHasChain, CGP);
943 bool InputHasChain = isRoot &&
944 NodeHasProperty(Pattern, SDNPHasChain, CGP);
945 unsigned NumResults = Inst.getNumResults();
946 unsigned NumDstRegs = HasImpResults ? DstRegs.size() : 0;
948 // Record output varargs info.
949 OutputIsVariadic = IsVariadic;
951 if (NodeHasOptInFlag) {
952 emitCode("bool HasInFlag = "
953 "(N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag);");
956 emitCode("SmallVector<SDValue, 8> Ops" + utostr(OpcNo) + ";");
958 // How many results is this pattern expected to produce?
959 unsigned NumPatResults = 0;
960 for (unsigned i = 0, e = Pattern->getExtTypes().size(); i != e; i++) {
961 MVT::SimpleValueType VT = Pattern->getTypeNum(i);
962 if (VT != MVT::isVoid && VT != MVT::Flag)
966 if (OrigChains.size() > 0) {
967 // The original input chain is being ignored. If it is not just
968 // pointing to the op that's being folded, we should create a
969 // TokenFactor with it and the chain of the folded op as the new chain.
970 // We could potentially be doing multiple levels of folding, in that
971 // case, the TokenFactor can have more operands.
972 emitCode("SmallVector<SDValue, 8> InChains;");
973 for (unsigned i = 0, e = OrigChains.size(); i < e; ++i) {
974 emitCode("if (" + OrigChains[i].first + ".getNode() != " +
975 OrigChains[i].second + ".getNode()) {");
976 emitCode(" InChains.push_back(" + OrigChains[i].first + ");");
979 emitCode("InChains.push_back(" + ChainName + ");");
980 emitCode(ChainName + " = CurDAG->getNode(ISD::TokenFactor, MVT::Other, "
981 "&InChains[0], InChains.size());");
983 emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"yellow\");");
984 emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"black\");");
988 // Loop over all of the operands of the instruction pattern, emitting code
989 // to fill them all in. The node 'N' usually has number children equal to
990 // the number of input operands of the instruction. However, in cases
991 // where there are predicate operands for an instruction, we need to fill
992 // in the 'execute always' values. Match up the node operands to the
993 // instruction operands to do this.
994 std::vector<std::string> AllOps;
995 for (unsigned ChildNo = 0, InstOpNo = NumResults;
996 InstOpNo != II.OperandList.size(); ++InstOpNo) {
997 std::vector<std::string> Ops;
999 // Determine what to emit for this operand.
1000 Record *OperandNode = II.OperandList[InstOpNo].Rec;
1001 if ((OperandNode->isSubClassOf("PredicateOperand") ||
1002 OperandNode->isSubClassOf("OptionalDefOperand")) &&
1003 !CGP.getDefaultOperand(OperandNode).DefaultOps.empty()) {
1004 // This is a predicate or optional def operand; emit the
1005 // 'default ops' operands.
1006 const DAGDefaultOperand &DefaultOp =
1007 CGP.getDefaultOperand(II.OperandList[InstOpNo].Rec);
1008 for (unsigned i = 0, e = DefaultOp.DefaultOps.size(); i != e; ++i) {
1009 Ops = EmitResultCode(DefaultOp.DefaultOps[i], DstRegs,
1010 InFlagDecled, ResNodeDecled);
1011 AllOps.insert(AllOps.end(), Ops.begin(), Ops.end());
1014 // Otherwise this is a normal operand or a predicate operand without
1015 // 'execute always'; emit it.
1016 Ops = EmitResultCode(N->getChild(ChildNo), DstRegs,
1017 InFlagDecled, ResNodeDecled);
1018 AllOps.insert(AllOps.end(), Ops.begin(), Ops.end());
1023 // Emit all the chain and CopyToReg stuff.
1024 bool ChainEmitted = NodeHasChain;
1025 if (NodeHasInFlag || HasImpInputs)
1026 EmitInFlagSelectCode(Pattern, "N", ChainEmitted,
1027 InFlagDecled, ResNodeDecled, true);
1028 if (NodeHasOptInFlag || NodeHasInFlag || HasImpInputs) {
1029 if (!InFlagDecled) {
1030 emitCode("SDValue InFlag(0, 0);");
1031 InFlagDecled = true;
1033 if (NodeHasOptInFlag) {
1034 emitCode("if (HasInFlag) {");
1035 emitCode(" InFlag = N.getOperand(N.getNumOperands()-1);");
1040 unsigned ResNo = TmpNo++;
1042 unsigned OpsNo = OpcNo;
1043 std::string CodePrefix;
1044 bool ChainAssignmentNeeded = NodeHasChain && !isRoot;
1045 std::deque<std::string> After;
1046 std::string NodeName;
1048 NodeName = "Tmp" + utostr(ResNo);
1049 CodePrefix = "SDValue " + NodeName + "(";
1051 NodeName = "ResNode";
1052 if (!ResNodeDecled) {
1053 CodePrefix = "SDNode *" + NodeName + " = ";
1054 ResNodeDecled = true;
1056 CodePrefix = NodeName + " = ";
1059 std::string Code = "Opc" + utostr(OpcNo);
1061 emitOpcode(II.Namespace + "::" + II.TheDef->getName());
1063 // Output order: results, chain, flags
1065 if (NumResults > 0 && N->getTypeNum(0) != MVT::isVoid) {
1066 Code += ", VT" + utostr(VTNo);
1067 emitVT(getEnumName(N->getTypeNum(0)));
1069 // Add types for implicit results in physical registers, scheduler will
1070 // care of adding copyfromreg nodes.
1071 for (unsigned i = 0; i < NumDstRegs; i++) {
1072 Record *RR = DstRegs[i];
1073 if (RR->isSubClassOf("Register")) {
1074 MVT::SimpleValueType RVT = getRegisterValueType(RR, CGT);
1075 Code += ", " + getEnumName(RVT);
1079 Code += ", MVT::Other";
1081 Code += ", MVT::Flag";
1085 for (unsigned i = 0, e = AllOps.size(); i != e; ++i)
1086 emitCode("Ops" + utostr(OpsNo) + ".push_back(" + AllOps[i] + ");");
1089 // Figure out whether any operands at the end of the op list are not
1090 // part of the variable section.
1091 std::string EndAdjust;
1092 if (NodeHasInFlag || HasImpInputs)
1093 EndAdjust = "-1"; // Always has one flag.
1094 else if (NodeHasOptInFlag)
1095 EndAdjust = "-(HasInFlag?1:0)"; // May have a flag.
1097 emitCode("for (unsigned i = NumInputRootOps + " + utostr(NodeHasChain) +
1098 ", e = N.getNumOperands()" + EndAdjust + "; i != e; ++i) {");
1100 emitCode(" Ops" + utostr(OpsNo) + ".push_back(N.getOperand(i));");
1104 // Generate MemOperandSDNodes nodes for each memory accesses covered by
1106 if (II.mayLoad | II.mayStore) {
1107 std::vector<std::string>::const_iterator mi, mie;
1108 for (mi = LSI.begin(), mie = LSI.end(); mi != mie; ++mi) {
1109 std::string LSIName = "LSI_" + *mi;
1110 emitCode("SDValue " + LSIName + " = "
1111 "CurDAG->getMemOperand(cast<MemSDNode>(" +
1112 *mi + ")->getMemOperand());");
1114 emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"yellow\");");
1115 emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"black\");");
1118 emitCode("Ops" + utostr(OpsNo) + ".push_back(" + LSIName + ");");
1120 AllOps.push_back(LSIName);
1126 emitCode("Ops" + utostr(OpsNo) + ".push_back(" + ChainName + ");");
1128 AllOps.push_back(ChainName);
1132 if (NodeHasInFlag || HasImpInputs)
1133 emitCode("Ops" + utostr(OpsNo) + ".push_back(InFlag);");
1134 else if (NodeHasOptInFlag) {
1135 emitCode("if (HasInFlag)");
1136 emitCode(" Ops" + utostr(OpsNo) + ".push_back(InFlag);");
1138 Code += ", &Ops" + utostr(OpsNo) + "[0], Ops" + utostr(OpsNo) +
1140 } else if (NodeHasInFlag || NodeHasOptInFlag || HasImpInputs)
1141 AllOps.push_back("InFlag");
1143 unsigned NumOps = AllOps.size();
1145 if (!NodeHasOptInFlag && NumOps < 4) {
1146 for (unsigned i = 0; i != NumOps; ++i)
1147 Code += ", " + AllOps[i];
1149 std::string OpsCode = "SDValue Ops" + utostr(OpsNo) + "[] = { ";
1150 for (unsigned i = 0; i != NumOps; ++i) {
1151 OpsCode += AllOps[i];
1155 emitCode(OpsCode + " };");
1156 Code += ", Ops" + utostr(OpsNo) + ", ";
1157 if (NodeHasOptInFlag) {
1158 Code += "HasInFlag ? ";
1159 Code += utostr(NumOps) + " : " + utostr(NumOps-1);
1161 Code += utostr(NumOps);
1168 std::vector<std::string> ReplaceFroms;
1169 std::vector<std::string> ReplaceTos;
1171 NodeOps.push_back("Tmp" + utostr(ResNo));
1174 if (NodeHasOutFlag) {
1175 if (!InFlagDecled) {
1176 After.push_back("SDValue InFlag(ResNode, " +
1177 utostr(NumResults+NumDstRegs+(unsigned)NodeHasChain) +
1179 InFlagDecled = true;
1181 After.push_back("InFlag = SDValue(ResNode, " +
1182 utostr(NumResults+NumDstRegs+(unsigned)NodeHasChain) +
1186 for (unsigned j = 0, e = FoldedChains.size(); j < e; j++) {
1187 ReplaceFroms.push_back("SDValue(" +
1188 FoldedChains[j].first + ".getNode(), " +
1189 utostr(FoldedChains[j].second) +
1191 ReplaceTos.push_back("SDValue(ResNode, " +
1192 utostr(NumResults+NumDstRegs) + ")");
1195 if (NodeHasOutFlag) {
1196 if (FoldedFlag.first != "") {
1197 ReplaceFroms.push_back("SDValue(" + FoldedFlag.first + ".getNode(), " +
1198 utostr(FoldedFlag.second) + ")");
1199 ReplaceTos.push_back("InFlag");
1201 assert(NodeHasProperty(Pattern, SDNPOutFlag, CGP));
1202 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1203 utostr(NumPatResults + (unsigned)InputHasChain)
1205 ReplaceTos.push_back("InFlag");
1209 if (!ReplaceFroms.empty() && InputHasChain) {
1210 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1211 utostr(NumPatResults) + ")");
1212 ReplaceTos.push_back("SDValue(" + ChainName + ".getNode(), " +
1213 ChainName + ".getResNo()" + ")");
1214 ChainAssignmentNeeded |= NodeHasChain;
1217 // User does not expect the instruction would produce a chain!
1218 if ((!InputHasChain && NodeHasChain) && NodeHasOutFlag) {
1220 } else if (InputHasChain && !NodeHasChain) {
1221 // One of the inner node produces a chain.
1222 if (NodeHasOutFlag) {
1223 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1224 utostr(NumPatResults+1) +
1226 ReplaceTos.push_back("SDValue(ResNode, N.getResNo()-1)");
1228 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1229 utostr(NumPatResults) + ")");
1230 ReplaceTos.push_back(ChainName);
1234 if (ChainAssignmentNeeded) {
1235 // Remember which op produces the chain.
1236 std::string ChainAssign;
1238 ChainAssign = ChainName + " = SDValue(" + NodeName +
1239 ".getNode(), " + utostr(NumResults+NumDstRegs) + ");";
1241 ChainAssign = ChainName + " = SDValue(" + NodeName +
1242 ", " + utostr(NumResults+NumDstRegs) + ");";
1244 After.push_front(ChainAssign);
1247 if (ReplaceFroms.size() == 1) {
1248 After.push_back("ReplaceUses(" + ReplaceFroms[0] + ", " +
1249 ReplaceTos[0] + ");");
1250 } else if (!ReplaceFroms.empty()) {
1251 After.push_back("const SDValue Froms[] = {");
1252 for (unsigned i = 0, e = ReplaceFroms.size(); i != e; ++i)
1253 After.push_back(" " + ReplaceFroms[i] + (i + 1 != e ? "," : ""));
1254 After.push_back("};");
1255 After.push_back("const SDValue Tos[] = {");
1256 for (unsigned i = 0, e = ReplaceFroms.size(); i != e; ++i)
1257 After.push_back(" " + ReplaceTos[i] + (i + 1 != e ? "," : ""));
1258 After.push_back("};");
1259 After.push_back("ReplaceUses(Froms, Tos, " +
1260 itostr(ReplaceFroms.size()) + ");");
1263 // We prefer to use SelectNodeTo since it avoids allocation when
1264 // possible and it avoids CSE map recalculation for the node's
1265 // users, however it's tricky to use in a non-root context.
1267 // We also don't use if the pattern replacement is being used to
1268 // jettison a chain result, since morphing the node in place
1269 // would leave users of the chain dangling.
1271 if (!isRoot || (InputHasChain && !NodeHasChain)) {
1272 Code = "CurDAG->getTargetNode(" + Code;
1274 Code = "CurDAG->SelectNodeTo(N.getNode(), " + Code;
1278 CodePrefix = "return ";
1280 After.push_back("return ResNode;");
1283 emitCode(CodePrefix + Code + ");");
1287 emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"yellow\");");
1288 emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"black\");");
1291 emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"yellow\");");
1292 emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"black\");");
1296 for (unsigned i = 0, e = After.size(); i != e; ++i)
1301 if (Op->isSubClassOf("SDNodeXForm")) {
1302 assert(N->getNumChildren() == 1 && "node xform should have one child!");
1303 // PatLeaf node - the operand may or may not be a leaf node. But it should
1305 std::vector<std::string> Ops =
1306 EmitResultCode(N->getChild(0), DstRegs, InFlagDecled,
1307 ResNodeDecled, true);
1308 unsigned ResNo = TmpNo++;
1309 emitCode("SDValue Tmp" + utostr(ResNo) + " = Transform_" + Op->getName()
1310 + "(" + Ops.back() + ".getNode());");
1311 NodeOps.push_back("Tmp" + utostr(ResNo));
1313 emitCode("return Tmp" + utostr(ResNo) + ".getNode();");
1319 throw std::string("Unknown node in result pattern!");
1322 /// InsertOneTypeCheck - Insert a type-check for an unresolved type in 'Pat'
1323 /// and add it to the tree. 'Pat' and 'Other' are isomorphic trees except that
1324 /// 'Pat' may be missing types. If we find an unresolved type to add a check
1325 /// for, this returns true otherwise false if Pat has all types.
1326 bool InsertOneTypeCheck(TreePatternNode *Pat, TreePatternNode *Other,
1327 const std::string &Prefix, bool isRoot = false) {
1329 if (Pat->getExtTypes() != Other->getExtTypes()) {
1330 // Move a type over from 'other' to 'pat'.
1331 Pat->setTypes(Other->getExtTypes());
1332 // The top level node type is checked outside of the select function.
1334 emitCheck(Prefix + ".getNode()->getValueType(0) == " +
1335 getName(Pat->getTypeNum(0)));
1340 (unsigned) NodeHasProperty(Pat, SDNPHasChain, CGP);
1341 for (unsigned i = 0, e = Pat->getNumChildren(); i != e; ++i, ++OpNo)
1342 if (InsertOneTypeCheck(Pat->getChild(i), Other->getChild(i),
1343 Prefix + utostr(OpNo)))
1349 /// EmitInFlagSelectCode - Emit the flag operands for the DAG that is
1351 void EmitInFlagSelectCode(TreePatternNode *N, const std::string &RootName,
1352 bool &ChainEmitted, bool &InFlagDecled,
1353 bool &ResNodeDecled, bool isRoot = false) {
1354 const CodeGenTarget &T = CGP.getTargetInfo();
1356 (unsigned) NodeHasProperty(N, SDNPHasChain, CGP);
1357 bool HasInFlag = NodeHasProperty(N, SDNPInFlag, CGP);
1358 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
1359 TreePatternNode *Child = N->getChild(i);
1360 if (!Child->isLeaf()) {
1361 EmitInFlagSelectCode(Child, RootName + utostr(OpNo), ChainEmitted,
1362 InFlagDecled, ResNodeDecled);
1364 if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
1365 if (!Child->getName().empty()) {
1366 std::string Name = RootName + utostr(OpNo);
1367 if (Duplicates.find(Name) != Duplicates.end())
1368 // A duplicate! Do not emit a copy for this node.
1372 Record *RR = DI->getDef();
1373 if (RR->isSubClassOf("Register")) {
1374 MVT::SimpleValueType RVT = getRegisterValueType(RR, T);
1375 if (RVT == MVT::Flag) {
1376 if (!InFlagDecled) {
1377 emitCode("SDValue InFlag = " + RootName + utostr(OpNo) + ";");
1378 InFlagDecled = true;
1380 emitCode("InFlag = " + RootName + utostr(OpNo) + ";");
1382 if (!ChainEmitted) {
1383 emitCode("SDValue Chain = CurDAG->getEntryNode();");
1384 ChainName = "Chain";
1385 ChainEmitted = true;
1387 if (!InFlagDecled) {
1388 emitCode("SDValue InFlag(0, 0);");
1389 InFlagDecled = true;
1391 std::string Decl = (!ResNodeDecled) ? "SDNode *" : "";
1392 emitCode(Decl + "ResNode = CurDAG->getCopyToReg(" + ChainName +
1393 ", " + getQualifiedName(RR) +
1394 ", " + RootName + utostr(OpNo) + ", InFlag).getNode();");
1395 ResNodeDecled = true;
1396 emitCode(ChainName + " = SDValue(ResNode, 0);");
1397 emitCode("InFlag = SDValue(ResNode, 1);");
1405 if (!InFlagDecled) {
1406 emitCode("SDValue InFlag = " + RootName +
1407 ".getOperand(" + utostr(OpNo) + ");");
1408 InFlagDecled = true;
1410 emitCode("InFlag = " + RootName +
1411 ".getOperand(" + utostr(OpNo) + ");");
1416 /// EmitCodeForPattern - Given a pattern to match, emit code to the specified
1417 /// stream to match the pattern, and generate the code for the match if it
1418 /// succeeds. Returns true if the pattern is not guaranteed to match.
1419 void DAGISelEmitter::GenerateCodeForPattern(const PatternToMatch &Pattern,
1420 std::vector<std::pair<unsigned, std::string> > &GeneratedCode,
1421 std::set<std::string> &GeneratedDecl,
1422 std::vector<std::string> &TargetOpcodes,
1423 std::vector<std::string> &TargetVTs,
1424 bool &OutputIsVariadic,
1425 unsigned &NumInputRootOps) {
1426 OutputIsVariadic = false;
1427 NumInputRootOps = 0;
1429 PatternCodeEmitter Emitter(CGP, Pattern.getPredicateCheck(),
1430 Pattern.getSrcPattern(), Pattern.getDstPattern(),
1431 GeneratedCode, GeneratedDecl,
1432 TargetOpcodes, TargetVTs,
1433 OutputIsVariadic, NumInputRootOps);
1435 // Emit the matcher, capturing named arguments in VariableMap.
1436 bool FoundChain = false;
1437 Emitter.EmitMatchCode(Pattern.getSrcPattern(), NULL, "N", "", FoundChain);
1439 // TP - Get *SOME* tree pattern, we don't care which.
1440 TreePattern &TP = *CGP.pf_begin()->second;
1442 // At this point, we know that we structurally match the pattern, but the
1443 // types of the nodes may not match. Figure out the fewest number of type
1444 // comparisons we need to emit. For example, if there is only one integer
1445 // type supported by a target, there should be no type comparisons at all for
1446 // integer patterns!
1448 // To figure out the fewest number of type checks needed, clone the pattern,
1449 // remove the types, then perform type inference on the pattern as a whole.
1450 // If there are unresolved types, emit an explicit check for those types,
1451 // apply the type to the tree, then rerun type inference. Iterate until all
1452 // types are resolved.
1454 TreePatternNode *Pat = Pattern.getSrcPattern()->clone();
1455 RemoveAllTypes(Pat);
1458 // Resolve/propagate as many types as possible.
1460 bool MadeChange = true;
1462 MadeChange = Pat->ApplyTypeConstraints(TP,
1463 true/*Ignore reg constraints*/);
1465 assert(0 && "Error: could not find consistent types for something we"
1466 " already decided was ok!");
1470 // Insert a check for an unresolved type and add it to the tree. If we find
1471 // an unresolved type to add a check for, this returns true and we iterate,
1472 // otherwise we are done.
1473 } while (Emitter.InsertOneTypeCheck(Pat, Pattern.getSrcPattern(), "N", true));
1475 Emitter.EmitResultCode(Pattern.getDstPattern(), Pattern.getDstRegs(),
1476 false, false, false, true);
1480 /// EraseCodeLine - Erase one code line from all of the patterns. If removing
1481 /// a line causes any of them to be empty, remove them and return true when
1483 static bool EraseCodeLine(std::vector<std::pair<const PatternToMatch*,
1484 std::vector<std::pair<unsigned, std::string> > > >
1486 bool ErasedPatterns = false;
1487 for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
1488 Patterns[i].second.pop_back();
1489 if (Patterns[i].second.empty()) {
1490 Patterns.erase(Patterns.begin()+i);
1492 ErasedPatterns = true;
1495 return ErasedPatterns;
1498 /// EmitPatterns - Emit code for at least one pattern, but try to group common
1499 /// code together between the patterns.
1500 void DAGISelEmitter::EmitPatterns(std::vector<std::pair<const PatternToMatch*,
1501 std::vector<std::pair<unsigned, std::string> > > >
1502 &Patterns, unsigned Indent,
1504 typedef std::pair<unsigned, std::string> CodeLine;
1505 typedef std::vector<CodeLine> CodeList;
1506 typedef std::vector<std::pair<const PatternToMatch*, CodeList> > PatternList;
1508 if (Patterns.empty()) return;
1510 // Figure out how many patterns share the next code line. Explicitly copy
1511 // FirstCodeLine so that we don't invalidate a reference when changing
1513 const CodeLine FirstCodeLine = Patterns.back().second.back();
1514 unsigned LastMatch = Patterns.size()-1;
1515 while (LastMatch != 0 && Patterns[LastMatch-1].second.back() == FirstCodeLine)
1518 // If not all patterns share this line, split the list into two pieces. The
1519 // first chunk will use this line, the second chunk won't.
1520 if (LastMatch != 0) {
1521 PatternList Shared(Patterns.begin()+LastMatch, Patterns.end());
1522 PatternList Other(Patterns.begin(), Patterns.begin()+LastMatch);
1524 // FIXME: Emit braces?
1525 if (Shared.size() == 1) {
1526 const PatternToMatch &Pattern = *Shared.back().first;
1527 OS << "\n" << std::string(Indent, ' ') << "// Pattern: ";
1528 Pattern.getSrcPattern()->print(OS);
1529 OS << "\n" << std::string(Indent, ' ') << "// Emits: ";
1530 Pattern.getDstPattern()->print(OS);
1532 unsigned AddedComplexity = Pattern.getAddedComplexity();
1533 OS << std::string(Indent, ' ') << "// Pattern complexity = "
1534 << getPatternSize(Pattern.getSrcPattern(), CGP) + AddedComplexity
1536 << getResultPatternCost(Pattern.getDstPattern(), CGP)
1538 << getResultPatternSize(Pattern.getDstPattern(), CGP) << "\n";
1540 if (FirstCodeLine.first != 1) {
1541 OS << std::string(Indent, ' ') << "{\n";
1544 EmitPatterns(Shared, Indent, OS);
1545 if (FirstCodeLine.first != 1) {
1547 OS << std::string(Indent, ' ') << "}\n";
1550 if (Other.size() == 1) {
1551 const PatternToMatch &Pattern = *Other.back().first;
1552 OS << "\n" << std::string(Indent, ' ') << "// Pattern: ";
1553 Pattern.getSrcPattern()->print(OS);
1554 OS << "\n" << std::string(Indent, ' ') << "// Emits: ";
1555 Pattern.getDstPattern()->print(OS);
1557 unsigned AddedComplexity = Pattern.getAddedComplexity();
1558 OS << std::string(Indent, ' ') << "// Pattern complexity = "
1559 << getPatternSize(Pattern.getSrcPattern(), CGP) + AddedComplexity
1561 << getResultPatternCost(Pattern.getDstPattern(), CGP)
1563 << getResultPatternSize(Pattern.getDstPattern(), CGP) << "\n";
1565 EmitPatterns(Other, Indent, OS);
1569 // Remove this code from all of the patterns that share it.
1570 bool ErasedPatterns = EraseCodeLine(Patterns);
1572 bool isPredicate = FirstCodeLine.first == 1;
1574 // Otherwise, every pattern in the list has this line. Emit it.
1577 OS << std::string(Indent, ' ') << FirstCodeLine.second << "\n";
1579 OS << std::string(Indent, ' ') << "if (" << FirstCodeLine.second;
1581 // If the next code line is another predicate, and if all of the pattern
1582 // in this group share the same next line, emit it inline now. Do this
1583 // until we run out of common predicates.
1584 while (!ErasedPatterns && Patterns.back().second.back().first == 1) {
1585 // Check that all of fhe patterns in Patterns end with the same predicate.
1586 bool AllEndWithSamePredicate = true;
1587 for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
1588 if (Patterns[i].second.back() != Patterns.back().second.back()) {
1589 AllEndWithSamePredicate = false;
1592 // If all of the predicates aren't the same, we can't share them.
1593 if (!AllEndWithSamePredicate) break;
1595 // Otherwise we can. Emit it shared now.
1596 OS << " &&\n" << std::string(Indent+4, ' ')
1597 << Patterns.back().second.back().second;
1598 ErasedPatterns = EraseCodeLine(Patterns);
1605 EmitPatterns(Patterns, Indent, OS);
1608 OS << std::string(Indent-2, ' ') << "}\n";
1611 static std::string getLegalCName(std::string OpName) {
1612 std::string::size_type pos = OpName.find("::");
1613 if (pos != std::string::npos)
1614 OpName.replace(pos, 2, "_");
1618 void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
1619 const CodeGenTarget &Target = CGP.getTargetInfo();
1621 // Get the namespace to insert instructions into.
1622 std::string InstNS = Target.getInstNamespace();
1623 if (!InstNS.empty()) InstNS += "::";
1625 // Group the patterns by their top-level opcodes.
1626 std::map<std::string, std::vector<const PatternToMatch*> > PatternsByOpcode;
1627 // All unique target node emission functions.
1628 std::map<std::string, unsigned> EmitFunctions;
1629 for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(),
1630 E = CGP.ptm_end(); I != E; ++I) {
1631 const PatternToMatch &Pattern = *I;
1633 TreePatternNode *Node = Pattern.getSrcPattern();
1634 if (!Node->isLeaf()) {
1635 PatternsByOpcode[getOpcodeName(Node->getOperator(), CGP)].
1636 push_back(&Pattern);
1638 const ComplexPattern *CP;
1639 if (dynamic_cast<IntInit*>(Node->getLeafValue())) {
1640 PatternsByOpcode[getOpcodeName(CGP.getSDNodeNamed("imm"), CGP)].
1641 push_back(&Pattern);
1642 } else if ((CP = NodeGetComplexPattern(Node, CGP))) {
1643 std::vector<Record*> OpNodes = CP->getRootNodes();
1644 for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
1645 PatternsByOpcode[getOpcodeName(OpNodes[j], CGP)]
1646 .insert(PatternsByOpcode[getOpcodeName(OpNodes[j], CGP)].begin(),
1650 cerr << "Unrecognized opcode '";
1652 cerr << "' on tree pattern '";
1653 cerr << Pattern.getDstPattern()->getOperator()->getName() << "'!\n";
1659 // For each opcode, there might be multiple select functions, one per
1660 // ValueType of the node (or its first operand if it doesn't produce a
1661 // non-chain result.
1662 std::map<std::string, std::vector<std::string> > OpcodeVTMap;
1664 // Emit one Select_* method for each top-level opcode. We do this instead of
1665 // emitting one giant switch statement to support compilers where this will
1666 // result in the recursive functions taking less stack space.
1667 for (std::map<std::string, std::vector<const PatternToMatch*> >::iterator
1668 PBOI = PatternsByOpcode.begin(), E = PatternsByOpcode.end();
1669 PBOI != E; ++PBOI) {
1670 const std::string &OpName = PBOI->first;
1671 std::vector<const PatternToMatch*> &PatternsOfOp = PBOI->second;
1672 assert(!PatternsOfOp.empty() && "No patterns but map has entry?");
1674 // Split them into groups by type.
1675 std::map<MVT::SimpleValueType,
1676 std::vector<const PatternToMatch*> > PatternsByType;
1677 for (unsigned i = 0, e = PatternsOfOp.size(); i != e; ++i) {
1678 const PatternToMatch *Pat = PatternsOfOp[i];
1679 TreePatternNode *SrcPat = Pat->getSrcPattern();
1680 PatternsByType[SrcPat->getTypeNum(0)].push_back(Pat);
1683 for (std::map<MVT::SimpleValueType,
1684 std::vector<const PatternToMatch*> >::iterator
1685 II = PatternsByType.begin(), EE = PatternsByType.end(); II != EE;
1687 MVT::SimpleValueType OpVT = II->first;
1688 std::vector<const PatternToMatch*> &Patterns = II->second;
1689 typedef std::pair<unsigned, std::string> CodeLine;
1690 typedef std::vector<CodeLine> CodeList;
1691 typedef CodeList::iterator CodeListI;
1693 std::vector<std::pair<const PatternToMatch*, CodeList> > CodeForPatterns;
1694 std::vector<std::vector<std::string> > PatternOpcodes;
1695 std::vector<std::vector<std::string> > PatternVTs;
1696 std::vector<std::set<std::string> > PatternDecls;
1697 std::vector<bool> OutputIsVariadicFlags;
1698 std::vector<unsigned> NumInputRootOpsCounts;
1699 for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
1700 CodeList GeneratedCode;
1701 std::set<std::string> GeneratedDecl;
1702 std::vector<std::string> TargetOpcodes;
1703 std::vector<std::string> TargetVTs;
1704 bool OutputIsVariadic;
1705 unsigned NumInputRootOps;
1706 GenerateCodeForPattern(*Patterns[i], GeneratedCode, GeneratedDecl,
1707 TargetOpcodes, TargetVTs,
1708 OutputIsVariadic, NumInputRootOps);
1709 CodeForPatterns.push_back(std::make_pair(Patterns[i], GeneratedCode));
1710 PatternDecls.push_back(GeneratedDecl);
1711 PatternOpcodes.push_back(TargetOpcodes);
1712 PatternVTs.push_back(TargetVTs);
1713 OutputIsVariadicFlags.push_back(OutputIsVariadic);
1714 NumInputRootOpsCounts.push_back(NumInputRootOps);
1717 // Factor target node emission code (emitted by EmitResultCode) into
1718 // separate functions. Uniquing and share them among all instruction
1719 // selection routines.
1720 for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
1721 CodeList &GeneratedCode = CodeForPatterns[i].second;
1722 std::vector<std::string> &TargetOpcodes = PatternOpcodes[i];
1723 std::vector<std::string> &TargetVTs = PatternVTs[i];
1724 std::set<std::string> Decls = PatternDecls[i];
1725 bool OutputIsVariadic = OutputIsVariadicFlags[i];
1726 unsigned NumInputRootOps = NumInputRootOpsCounts[i];
1727 std::vector<std::string> AddedInits;
1728 int CodeSize = (int)GeneratedCode.size();
1730 for (int j = CodeSize-1; j >= 0; --j) {
1731 if (LastPred == -1 && GeneratedCode[j].first == 1)
1733 else if (LastPred != -1 && GeneratedCode[j].first == 2)
1734 AddedInits.push_back(GeneratedCode[j].second);
1737 std::string CalleeCode = "(const SDValue &N";
1738 std::string CallerCode = "(N";
1739 for (unsigned j = 0, e = TargetOpcodes.size(); j != e; ++j) {
1740 CalleeCode += ", unsigned Opc" + utostr(j);
1741 CallerCode += ", " + TargetOpcodes[j];
1743 for (unsigned j = 0, e = TargetVTs.size(); j != e; ++j) {
1744 CalleeCode += ", MVT VT" + utostr(j);
1745 CallerCode += ", " + TargetVTs[j];
1747 for (std::set<std::string>::iterator
1748 I = Decls.begin(), E = Decls.end(); I != E; ++I) {
1749 std::string Name = *I;
1750 CalleeCode += ", SDValue &" + Name;
1751 CallerCode += ", " + Name;
1754 if (OutputIsVariadic) {
1755 CalleeCode += ", unsigned NumInputRootOps";
1756 CallerCode += ", " + utostr(NumInputRootOps);
1761 // Prevent emission routines from being inlined to reduce selection
1762 // routines stack frame sizes.
1763 CalleeCode += "DISABLE_INLINE ";
1764 CalleeCode += "{\n";
1766 for (std::vector<std::string>::const_reverse_iterator
1767 I = AddedInits.rbegin(), E = AddedInits.rend(); I != E; ++I)
1768 CalleeCode += " " + *I + "\n";
1770 for (int j = LastPred+1; j < CodeSize; ++j)
1771 CalleeCode += " " + GeneratedCode[j].second + "\n";
1772 for (int j = LastPred+1; j < CodeSize; ++j)
1773 GeneratedCode.pop_back();
1774 CalleeCode += "}\n";
1776 // Uniquing the emission routines.
1777 unsigned EmitFuncNum;
1778 std::map<std::string, unsigned>::iterator EFI =
1779 EmitFunctions.find(CalleeCode);
1780 if (EFI != EmitFunctions.end()) {
1781 EmitFuncNum = EFI->second;
1783 EmitFuncNum = EmitFunctions.size();
1784 EmitFunctions.insert(std::make_pair(CalleeCode, EmitFuncNum));
1785 OS << "SDNode *Emit_" << utostr(EmitFuncNum) << CalleeCode;
1788 // Replace the emission code within selection routines with calls to the
1789 // emission functions.
1791 GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"red\");"));
1793 CallerCode = "SDNode *Result = Emit_" + utostr(EmitFuncNum) + CallerCode;
1794 GeneratedCode.push_back(std::make_pair(3, CallerCode));
1796 GeneratedCode.push_back(std::make_pair(0, "if(Result) {"));
1797 GeneratedCode.push_back(std::make_pair(0, " CurDAG->setSubgraphColor(Result, \"yellow\");"));
1798 GeneratedCode.push_back(std::make_pair(0, " CurDAG->setSubgraphColor(Result, \"black\");"));
1799 GeneratedCode.push_back(std::make_pair(0, "}"));
1800 //GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"black\");"));
1802 GeneratedCode.push_back(std::make_pair(0, "return Result;"));
1806 std::string OpVTStr;
1807 if (OpVT == MVT::iPTR) {
1809 } else if (OpVT == MVT::iPTRAny) {
1810 OpVTStr = "_iPTRAny";
1811 } else if (OpVT == MVT::isVoid) {
1812 // Nodes with a void result actually have a first result type of either
1813 // Other (a chain) or Flag. Since there is no one-to-one mapping from
1814 // void to this case, we handle it specially here.
1816 OpVTStr = "_" + getEnumName(OpVT).substr(5); // Skip 'MVT::'
1818 std::map<std::string, std::vector<std::string> >::iterator OpVTI =
1819 OpcodeVTMap.find(OpName);
1820 if (OpVTI == OpcodeVTMap.end()) {
1821 std::vector<std::string> VTSet;
1822 VTSet.push_back(OpVTStr);
1823 OpcodeVTMap.insert(std::make_pair(OpName, VTSet));
1825 OpVTI->second.push_back(OpVTStr);
1827 OS << "SDNode *Select_" << getLegalCName(OpName)
1828 << OpVTStr << "(const SDValue &N) {\n";
1830 // We want to emit all of the matching code now. However, we want to emit
1831 // the matches in order of minimal cost. Sort the patterns so the least
1832 // cost one is at the start.
1833 std::stable_sort(CodeForPatterns.begin(), CodeForPatterns.end(),
1834 PatternSortingPredicate(CGP));
1836 // Scan the code to see if all of the patterns are reachable and if it is
1837 // possible that the last one might not match.
1838 bool mightNotMatch = true;
1839 for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
1840 CodeList &GeneratedCode = CodeForPatterns[i].second;
1841 mightNotMatch = false;
1843 for (unsigned j = 0, e = GeneratedCode.size(); j != e; ++j) {
1844 if (GeneratedCode[j].first == 1) { // predicate.
1845 mightNotMatch = true;
1850 // If this pattern definitely matches, and if it isn't the last one, the
1851 // patterns after it CANNOT ever match. Error out.
1852 if (mightNotMatch == false && i != CodeForPatterns.size()-1) {
1853 cerr << "Pattern '";
1854 CodeForPatterns[i].first->getSrcPattern()->print(*cerr.stream());
1855 cerr << "' is impossible to select!\n";
1860 // Loop through and reverse all of the CodeList vectors, as we will be
1861 // accessing them from their logical front, but accessing the end of a
1862 // vector is more efficient.
1863 for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
1864 CodeList &GeneratedCode = CodeForPatterns[i].second;
1865 std::reverse(GeneratedCode.begin(), GeneratedCode.end());
1868 // Next, reverse the list of patterns itself for the same reason.
1869 std::reverse(CodeForPatterns.begin(), CodeForPatterns.end());
1871 // Emit all of the patterns now, grouped together to share code.
1872 EmitPatterns(CodeForPatterns, 2, OS);
1874 // If the last pattern has predicates (which could fail) emit code to
1875 // catch the case where nothing handles a pattern.
1876 if (mightNotMatch) {
1878 if (OpName != "ISD::INTRINSIC_W_CHAIN" &&
1879 OpName != "ISD::INTRINSIC_WO_CHAIN" &&
1880 OpName != "ISD::INTRINSIC_VOID")
1881 OS << " CannotYetSelect(N);\n";
1883 OS << " CannotYetSelectIntrinsic(N);\n";
1885 OS << " return NULL;\n";
1891 // Emit boilerplate.
1892 OS << "SDNode *Select_INLINEASM(SDValue N) {\n"
1893 << " std::vector<SDValue> Ops(N.getNode()->op_begin(), N.getNode()->op_end());\n"
1894 << " SelectInlineAsmMemoryOperands(Ops);\n\n"
1896 << " std::vector<MVT> VTs;\n"
1897 << " VTs.push_back(MVT::Other);\n"
1898 << " VTs.push_back(MVT::Flag);\n"
1899 << " SDValue New = CurDAG->getNode(ISD::INLINEASM, VTs, &Ops[0], "
1901 << " return New.getNode();\n"
1904 OS << "SDNode *Select_UNDEF(const SDValue &N) {\n"
1905 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::IMPLICIT_DEF,\n"
1906 << " N.getValueType());\n"
1909 OS << "SDNode *Select_DBG_LABEL(const SDValue &N) {\n"
1910 << " SDValue Chain = N.getOperand(0);\n"
1911 << " unsigned C = cast<LabelSDNode>(N)->getLabelID();\n"
1912 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1913 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::DBG_LABEL,\n"
1914 << " MVT::Other, Tmp, Chain);\n"
1917 OS << "SDNode *Select_EH_LABEL(const SDValue &N) {\n"
1918 << " SDValue Chain = N.getOperand(0);\n"
1919 << " unsigned C = cast<LabelSDNode>(N)->getLabelID();\n"
1920 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1921 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::EH_LABEL,\n"
1922 << " MVT::Other, Tmp, Chain);\n"
1925 OS << "SDNode *Select_DECLARE(const SDValue &N) {\n"
1926 << " SDValue Chain = N.getOperand(0);\n"
1927 << " SDValue N1 = N.getOperand(1);\n"
1928 << " SDValue N2 = N.getOperand(2);\n"
1929 << " if (!isa<FrameIndexSDNode>(N1) || !isa<GlobalAddressSDNode>(N2)) {\n"
1930 << " CannotYetSelect(N);\n"
1932 << " int FI = cast<FrameIndexSDNode>(N1)->getIndex();\n"
1933 << " GlobalValue *GV = cast<GlobalAddressSDNode>(N2)->getGlobal();\n"
1934 << " SDValue Tmp1 = "
1935 << "CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());\n"
1936 << " SDValue Tmp2 = "
1937 << "CurDAG->getTargetGlobalAddress(GV, TLI.getPointerTy());\n"
1938 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::DECLARE,\n"
1939 << " MVT::Other, Tmp1, Tmp2, Chain);\n"
1942 OS << "SDNode *Select_EXTRACT_SUBREG(const SDValue &N) {\n"
1943 << " SDValue N0 = N.getOperand(0);\n"
1944 << " SDValue N1 = N.getOperand(1);\n"
1945 << " unsigned C = cast<ConstantSDNode>(N1)->getZExtValue();\n"
1946 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1947 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::EXTRACT_SUBREG,\n"
1948 << " N.getValueType(), N0, Tmp);\n"
1951 OS << "SDNode *Select_INSERT_SUBREG(const SDValue &N) {\n"
1952 << " SDValue N0 = N.getOperand(0);\n"
1953 << " SDValue N1 = N.getOperand(1);\n"
1954 << " SDValue N2 = N.getOperand(2);\n"
1955 << " unsigned C = cast<ConstantSDNode>(N2)->getZExtValue();\n"
1956 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1957 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::INSERT_SUBREG,\n"
1958 << " N.getValueType(), N0, N1, Tmp);\n"
1961 OS << "// The main instruction selector code.\n"
1962 << "SDNode *SelectCode(SDValue N) {\n"
1963 << " MVT::SimpleValueType NVT = N.getNode()->getValueType(0).getSimpleVT();\n"
1964 << " switch (N.getOpcode()) {\n"
1966 << " assert(!N.isMachineOpcode() && \"Node already selected!\");\n"
1968 << " case ISD::EntryToken: // These nodes remain the same.\n"
1969 << " case ISD::MEMOPERAND:\n"
1970 << " case ISD::BasicBlock:\n"
1971 << " case ISD::Register:\n"
1972 << " case ISD::HANDLENODE:\n"
1973 << " case ISD::TargetConstant:\n"
1974 << " case ISD::TargetConstantFP:\n"
1975 << " case ISD::TargetConstantPool:\n"
1976 << " case ISD::TargetFrameIndex:\n"
1977 << " case ISD::TargetExternalSymbol:\n"
1978 << " case ISD::TargetJumpTable:\n"
1979 << " case ISD::TargetGlobalTLSAddress:\n"
1980 << " case ISD::TargetGlobalAddress:\n"
1981 << " case ISD::TokenFactor:\n"
1982 << " case ISD::CopyFromReg:\n"
1983 << " case ISD::CopyToReg: {\n"
1984 << " return NULL;\n"
1986 << " case ISD::AssertSext:\n"
1987 << " case ISD::AssertZext: {\n"
1988 << " ReplaceUses(N, N.getOperand(0));\n"
1989 << " return NULL;\n"
1991 << " case ISD::INLINEASM: return Select_INLINEASM(N);\n"
1992 << " case ISD::DBG_LABEL: return Select_DBG_LABEL(N);\n"
1993 << " case ISD::EH_LABEL: return Select_EH_LABEL(N);\n"
1994 << " case ISD::DECLARE: return Select_DECLARE(N);\n"
1995 << " case ISD::EXTRACT_SUBREG: return Select_EXTRACT_SUBREG(N);\n"
1996 << " case ISD::INSERT_SUBREG: return Select_INSERT_SUBREG(N);\n"
1997 << " case ISD::UNDEF: return Select_UNDEF(N);\n";
1999 // Loop over all of the case statements, emiting a call to each method we
2001 for (std::map<std::string, std::vector<const PatternToMatch*> >::iterator
2002 PBOI = PatternsByOpcode.begin(), E = PatternsByOpcode.end();
2003 PBOI != E; ++PBOI) {
2004 const std::string &OpName = PBOI->first;
2005 // Potentially multiple versions of select for this opcode. One for each
2006 // ValueType of the node (or its first true operand if it doesn't produce a
2008 std::map<std::string, std::vector<std::string> >::iterator OpVTI =
2009 OpcodeVTMap.find(OpName);
2010 std::vector<std::string> &OpVTs = OpVTI->second;
2011 OS << " case " << OpName << ": {\n";
2012 // Keep track of whether we see a pattern that has an iPtr result.
2013 bool HasPtrPattern = false;
2014 bool HasDefaultPattern = false;
2016 OS << " switch (NVT) {\n";
2017 for (unsigned i = 0, e = OpVTs.size(); i < e; ++i) {
2018 std::string &VTStr = OpVTs[i];
2019 if (VTStr.empty()) {
2020 HasDefaultPattern = true;
2024 // If this is a match on iPTR: don't emit it directly, we need special
2026 if (VTStr == "_iPTR") {
2027 HasPtrPattern = true;
2030 OS << " case MVT::" << VTStr.substr(1) << ":\n"
2031 << " return Select_" << getLegalCName(OpName)
2032 << VTStr << "(N);\n";
2034 OS << " default:\n";
2036 // If there is an iPTR result version of this pattern, emit it here.
2037 if (HasPtrPattern) {
2038 OS << " if (TLI.getPointerTy() == NVT)\n";
2039 OS << " return Select_" << getLegalCName(OpName) <<"_iPTR(N);\n";
2041 if (HasDefaultPattern) {
2042 OS << " return Select_" << getLegalCName(OpName) << "(N);\n";
2050 OS << " } // end of big switch.\n\n"
2051 << " if (N.getOpcode() != ISD::INTRINSIC_W_CHAIN &&\n"
2052 << " N.getOpcode() != ISD::INTRINSIC_WO_CHAIN &&\n"
2053 << " N.getOpcode() != ISD::INTRINSIC_VOID) {\n"
2054 << " CannotYetSelect(N);\n"
2056 << " CannotYetSelectIntrinsic(N);\n"
2058 << " return NULL;\n"
2061 OS << "void CannotYetSelect(SDValue N) DISABLE_INLINE {\n"
2062 << " cerr << \"Cannot yet select: \";\n"
2063 << " N.getNode()->dump(CurDAG);\n"
2064 << " cerr << '\\n';\n"
2068 OS << "void CannotYetSelectIntrinsic(SDValue N) DISABLE_INLINE {\n"
2069 << " cerr << \"Cannot yet select: \";\n"
2070 << " unsigned iid = cast<ConstantSDNode>(N.getOperand("
2071 << "N.getOperand(0).getValueType() == MVT::Other))->getZExtValue();\n"
2072 << " cerr << \"intrinsic %\"<< "
2073 << "Intrinsic::getName((Intrinsic::ID)iid);\n"
2074 << " cerr << '\\n';\n"
2079 void DAGISelEmitter::run(std::ostream &OS) {
2080 EmitSourceFileHeader("DAG Instruction Selector for the " +
2081 CGP.getTargetInfo().getName() + " target", OS);
2083 OS << "// *** NOTE: This file is #included into the middle of the target\n"
2084 << "// *** instruction selector class. These functions are really "
2087 OS << "// Include standard, target-independent definitions and methods used\n"
2088 << "// by the instruction selector.\n";
2089 OS << "#include <llvm/CodeGen/DAGISelHeader.h>\n\n";
2091 EmitNodeTransforms(OS);
2092 EmitPredicateFunctions(OS);
2094 DOUT << "\n\nALL PATTERNS TO MATCH:\n\n";
2095 for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(), E = CGP.ptm_end();
2097 DOUT << "PATTERN: "; DEBUG(I->getSrcPattern()->dump());
2098 DOUT << "\nRESULT: "; DEBUG(I->getDstPattern()->dump());
2102 // At this point, we have full information about the 'Patterns' we need to
2103 // parse, both implicitly from instructions as well as from explicit pattern
2104 // definitions. Emit the resultant instruction selector.
2105 EmitInstructionSelector(OS);