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("CanBeFoldedBy(" + RootName + ".getNode(), " + ParentName +
526 ".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 emitCheck("isa<ConstantSDNode>(" + RootName + "1)");
587 const char *MaskPredicate = N->getOperator()->getName() == "or"
588 ? "CheckOrMask(" : "CheckAndMask(";
589 emitCheck(MaskPredicate + RootName + "0, cast<ConstantSDNode>(" +
590 RootName + "1), INT64_C(" + itostr(II->getValue()) + "))");
592 EmitChildMatchCode(N->getChild(0), N, RootName + utostr(0), RootName,
593 ChainSuffix + utostr(0), FoundChain);
599 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
600 emitInit("SDValue " + RootName + utostr(OpNo) + " = " +
601 RootName + ".getOperand(" +utostr(OpNo) + ");");
603 EmitChildMatchCode(N->getChild(i), N, RootName + utostr(OpNo), RootName,
604 ChainSuffix + utostr(OpNo), FoundChain);
607 // Handle cases when root is a complex pattern.
608 const ComplexPattern *CP;
609 if (isRoot && N->isLeaf() && (CP = NodeGetComplexPattern(N, CGP))) {
610 std::string Fn = CP->getSelectFunc();
611 unsigned NumOps = CP->getNumOperands();
612 for (unsigned i = 0; i < NumOps; ++i) {
613 emitDecl("CPTmp" + utostr(i));
614 emitCode("SDValue CPTmp" + utostr(i) + ";");
616 if (CP->hasProperty(SDNPHasChain)) {
617 emitDecl("CPInChain");
618 emitDecl("Chain" + ChainSuffix);
619 emitCode("SDValue CPInChain;");
620 emitCode("SDValue Chain" + ChainSuffix + ";");
623 std::string Code = Fn + "(" + RootName + ", " + RootName;
624 for (unsigned i = 0; i < NumOps; i++)
625 Code += ", CPTmp" + utostr(i);
626 if (CP->hasProperty(SDNPHasChain)) {
627 ChainName = "Chain" + ChainSuffix;
628 Code += ", CPInChain, Chain" + ChainSuffix;
630 emitCheck(Code + ")");
634 void EmitChildMatchCode(TreePatternNode *Child, TreePatternNode *Parent,
635 const std::string &RootName,
636 const std::string &ParentRootName,
637 const std::string &ChainSuffix, bool &FoundChain) {
638 if (!Child->isLeaf()) {
639 // If it's not a leaf, recursively match.
640 const SDNodeInfo &CInfo = CGP.getSDNodeInfo(Child->getOperator());
641 emitCheck(RootName + ".getOpcode() == " +
642 CInfo.getEnumName());
643 EmitMatchCode(Child, Parent, RootName, ChainSuffix, FoundChain);
644 bool HasChain = false;
645 if (NodeHasProperty(Child, SDNPHasChain, CGP)) {
647 FoldedChains.push_back(std::make_pair(RootName, CInfo.getNumResults()));
649 if (NodeHasProperty(Child, SDNPOutFlag, CGP)) {
650 assert(FoldedFlag.first == "" && FoldedFlag.second == 0 &&
651 "Pattern folded multiple nodes which produce flags?");
652 FoldedFlag = std::make_pair(RootName,
653 CInfo.getNumResults() + (unsigned)HasChain);
656 // If this child has a name associated with it, capture it in VarMap. If
657 // we already saw this in the pattern, emit code to verify dagness.
658 if (!Child->getName().empty()) {
659 std::string &VarMapEntry = VariableMap[Child->getName()];
660 if (VarMapEntry.empty()) {
661 VarMapEntry = RootName;
663 // If we get here, this is a second reference to a specific name.
664 // Since we already have checked that the first reference is valid,
665 // we don't have to recursively match it, just check that it's the
666 // same as the previously named thing.
667 emitCheck(VarMapEntry + " == " + RootName);
668 Duplicates.insert(RootName);
673 // Handle leaves of various types.
674 if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
675 Record *LeafRec = DI->getDef();
676 if (LeafRec->isSubClassOf("RegisterClass") ||
677 LeafRec->getName() == "ptr_rc") {
678 // Handle register references. Nothing to do here.
679 } else if (LeafRec->isSubClassOf("Register")) {
680 // Handle register references.
681 } else if (LeafRec->isSubClassOf("ComplexPattern")) {
682 // Handle complex pattern.
683 const ComplexPattern *CP = NodeGetComplexPattern(Child, CGP);
684 std::string Fn = CP->getSelectFunc();
685 unsigned NumOps = CP->getNumOperands();
686 for (unsigned i = 0; i < NumOps; ++i) {
687 emitDecl("CPTmp" + utostr(i));
688 emitCode("SDValue CPTmp" + utostr(i) + ";");
690 if (CP->hasProperty(SDNPHasChain)) {
691 const SDNodeInfo &PInfo = CGP.getSDNodeInfo(Parent->getOperator());
692 FoldedChains.push_back(std::make_pair("CPInChain",
693 PInfo.getNumResults()));
694 ChainName = "Chain" + ChainSuffix;
695 emitDecl("CPInChain");
697 emitCode("SDValue CPInChain;");
698 emitCode("SDValue " + ChainName + ";");
701 std::string Code = Fn + "(";
702 if (CP->hasAttribute(CPAttrParentAsRoot)) {
703 Code += ParentRootName + ", ";
707 if (CP->hasProperty(SDNPHasChain)) {
708 std::string ParentName(RootName.begin(), RootName.end()-1);
709 Code += ParentName + ", ";
712 for (unsigned i = 0; i < NumOps; i++)
713 Code += ", CPTmp" + utostr(i);
714 if (CP->hasProperty(SDNPHasChain))
715 Code += ", CPInChain, Chain" + ChainSuffix;
716 emitCheck(Code + ")");
717 } else if (LeafRec->getName() == "srcvalue") {
718 // Place holder for SRCVALUE nodes. Nothing to do here.
719 } else if (LeafRec->isSubClassOf("ValueType")) {
720 // Make sure this is the specified value type.
721 emitCheck("cast<VTSDNode>(" + RootName +
722 ")->getVT() == MVT::" + LeafRec->getName());
723 } else if (LeafRec->isSubClassOf("CondCode")) {
724 // Make sure this is the specified cond code.
725 emitCheck("cast<CondCodeSDNode>(" + RootName +
726 ")->get() == ISD::" + LeafRec->getName());
732 assert(0 && "Unknown leaf type!");
735 // If there are node predicates for this, emit the calls.
736 for (unsigned i = 0, e = Child->getPredicateFns().size(); i != e; ++i)
737 emitCheck(Child->getPredicateFns()[i] + "(" + RootName +
739 } else if (IntInit *II =
740 dynamic_cast<IntInit*>(Child->getLeafValue())) {
741 emitCheck("isa<ConstantSDNode>(" + RootName + ")");
742 unsigned CTmp = TmpNo++;
743 emitCode("int64_t CN"+utostr(CTmp)+" = cast<ConstantSDNode>("+
744 RootName + ")->getSExtValue();");
746 emitCheck("CN" + utostr(CTmp) + " == "
747 "INT64_C(" +itostr(II->getValue()) + ")");
752 assert(0 && "Unknown leaf type!");
757 /// EmitResultCode - Emit the action for a pattern. Now that it has matched
758 /// we actually have to build a DAG!
759 std::vector<std::string>
760 EmitResultCode(TreePatternNode *N, std::vector<Record*> DstRegs,
761 bool InFlagDecled, bool ResNodeDecled,
762 bool LikeLeaf = false, bool isRoot = false) {
763 // List of arguments of getTargetNode() or SelectNodeTo().
764 std::vector<std::string> NodeOps;
765 // This is something selected from the pattern we matched.
766 if (!N->getName().empty()) {
767 const std::string &VarName = N->getName();
768 std::string Val = VariableMap[VarName];
769 bool ModifiedVal = false;
771 cerr << "Variable '" << VarName << " referenced but not defined "
772 << "and not caught earlier!\n";
775 if (Val[0] == 'T' && Val[1] == 'm' && Val[2] == 'p') {
776 // Already selected this operand, just return the tmpval.
777 NodeOps.push_back(Val);
781 const ComplexPattern *CP;
782 unsigned ResNo = TmpNo++;
783 if (!N->isLeaf() && N->getOperator()->getName() == "imm") {
784 assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
785 std::string CastType;
786 std::string TmpVar = "Tmp" + utostr(ResNo);
787 switch (N->getTypeNum(0)) {
789 cerr << "Cannot handle " << getEnumName(N->getTypeNum(0))
790 << " type as an immediate constant. Aborting\n";
792 case MVT::i1: CastType = "bool"; break;
793 case MVT::i8: CastType = "unsigned char"; break;
794 case MVT::i16: CastType = "unsigned short"; break;
795 case MVT::i32: CastType = "unsigned"; break;
796 case MVT::i64: CastType = "uint64_t"; break;
798 emitCode("SDValue " + TmpVar +
799 " = CurDAG->getTargetConstant(((" + CastType +
800 ") cast<ConstantSDNode>(" + Val + ")->getZExtValue()), " +
801 getEnumName(N->getTypeNum(0)) + ");");
802 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select this
803 // value if used multiple times by this pattern result.
806 NodeOps.push_back(Val);
807 } else if (!N->isLeaf() && N->getOperator()->getName() == "fpimm") {
808 assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
809 std::string TmpVar = "Tmp" + utostr(ResNo);
810 emitCode("SDValue " + TmpVar +
811 " = CurDAG->getTargetConstantFP(*cast<ConstantFPSDNode>(" +
812 Val + ")->getConstantFPValue(), cast<ConstantFPSDNode>(" +
813 Val + ")->getValueType(0));");
814 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select this
815 // value if used multiple times by this pattern result.
818 NodeOps.push_back(Val);
819 } else if (!N->isLeaf() && N->getOperator()->getName() == "texternalsym"){
820 Record *Op = OperatorMap[N->getName()];
821 // Transform ExternalSymbol to TargetExternalSymbol
822 if (Op && Op->getName() == "externalsym") {
823 std::string TmpVar = "Tmp"+utostr(ResNo);
824 emitCode("SDValue " + TmpVar + " = CurDAG->getTarget"
825 "ExternalSymbol(cast<ExternalSymbolSDNode>(" +
826 Val + ")->getSymbol(), " +
827 getEnumName(N->getTypeNum(0)) + ");");
828 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select
829 // this value if used multiple times by this pattern result.
833 NodeOps.push_back(Val);
834 } else if (!N->isLeaf() && (N->getOperator()->getName() == "tglobaladdr"
835 || N->getOperator()->getName() == "tglobaltlsaddr")) {
836 Record *Op = OperatorMap[N->getName()];
837 // Transform GlobalAddress to TargetGlobalAddress
838 if (Op && (Op->getName() == "globaladdr" ||
839 Op->getName() == "globaltlsaddr")) {
840 std::string TmpVar = "Tmp" + utostr(ResNo);
841 emitCode("SDValue " + TmpVar + " = CurDAG->getTarget"
842 "GlobalAddress(cast<GlobalAddressSDNode>(" + Val +
843 ")->getGlobal(), " + getEnumName(N->getTypeNum(0)) +
845 // Add Tmp<ResNo> to VariableMap, so that we don't multiply select
846 // this value if used multiple times by this pattern result.
850 NodeOps.push_back(Val);
851 } else if (!N->isLeaf()
852 && (N->getOperator()->getName() == "texternalsym"
853 || N->getOperator()->getName() == "tconstpool")) {
854 // Do not rewrite the variable name, since we don't generate a new
856 NodeOps.push_back(Val);
857 } else if (N->isLeaf() && (CP = NodeGetComplexPattern(N, CGP))) {
858 for (unsigned i = 0; i < CP->getNumOperands(); ++i) {
859 emitCode("AddToISelQueue(CPTmp" + utostr(i) + ");");
860 NodeOps.push_back("CPTmp" + utostr(i));
863 // This node, probably wrapped in a SDNodeXForm, behaves like a leaf
864 // node even if it isn't one. Don't select it.
866 emitCode("AddToISelQueue(" + Val + ");");
867 if (isRoot && N->isLeaf()) {
868 emitCode("ReplaceUses(N, " + Val + ");");
869 emitCode("return NULL;");
872 NodeOps.push_back(Val);
876 VariableMap[VarName] = Val;
881 // If this is an explicit register reference, handle it.
882 if (DefInit *DI = dynamic_cast<DefInit*>(N->getLeafValue())) {
883 unsigned ResNo = TmpNo++;
884 if (DI->getDef()->isSubClassOf("Register")) {
885 emitCode("SDValue Tmp" + utostr(ResNo) + " = CurDAG->getRegister(" +
886 getQualifiedName(DI->getDef()) + ", " +
887 getEnumName(N->getTypeNum(0)) + ");");
888 NodeOps.push_back("Tmp" + utostr(ResNo));
890 } else if (DI->getDef()->getName() == "zero_reg") {
891 emitCode("SDValue Tmp" + utostr(ResNo) +
892 " = CurDAG->getRegister(0, " +
893 getEnumName(N->getTypeNum(0)) + ");");
894 NodeOps.push_back("Tmp" + utostr(ResNo));
897 } else if (IntInit *II = dynamic_cast<IntInit*>(N->getLeafValue())) {
898 unsigned ResNo = TmpNo++;
899 assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
900 emitCode("SDValue Tmp" + utostr(ResNo) +
901 " = CurDAG->getTargetConstant(0x" + itohexstr(II->getValue()) +
902 "ULL, " + getEnumName(N->getTypeNum(0)) + ");");
903 NodeOps.push_back("Tmp" + utostr(ResNo));
910 assert(0 && "Unknown leaf type!");
914 Record *Op = N->getOperator();
915 if (Op->isSubClassOf("Instruction")) {
916 const CodeGenTarget &CGT = CGP.getTargetInfo();
917 CodeGenInstruction &II = CGT.getInstruction(Op->getName());
918 const DAGInstruction &Inst = CGP.getInstruction(Op);
919 const TreePattern *InstPat = Inst.getPattern();
920 // FIXME: Assume actual pattern comes before "implicit".
921 TreePatternNode *InstPatNode =
922 isRoot ? (InstPat ? InstPat->getTree(0) : Pattern)
923 : (InstPat ? InstPat->getTree(0) : NULL);
924 if (InstPatNode && InstPatNode->getOperator()->getName() == "set") {
925 InstPatNode = InstPatNode->getChild(InstPatNode->getNumChildren()-1);
927 bool IsVariadic = isRoot && II.isVariadic;
928 // FIXME: fix how we deal with physical register operands.
929 bool HasImpInputs = isRoot && Inst.getNumImpOperands() > 0;
930 bool HasImpResults = isRoot && DstRegs.size() > 0;
931 bool NodeHasOptInFlag = isRoot &&
932 PatternHasProperty(Pattern, SDNPOptInFlag, CGP);
933 bool NodeHasInFlag = isRoot &&
934 PatternHasProperty(Pattern, SDNPInFlag, CGP);
935 bool NodeHasOutFlag = isRoot &&
936 PatternHasProperty(Pattern, SDNPOutFlag, CGP);
937 bool NodeHasChain = InstPatNode &&
938 PatternHasProperty(InstPatNode, SDNPHasChain, CGP);
939 bool InputHasChain = isRoot &&
940 NodeHasProperty(Pattern, SDNPHasChain, CGP);
941 unsigned NumResults = Inst.getNumResults();
942 unsigned NumDstRegs = HasImpResults ? DstRegs.size() : 0;
944 // Record output varargs info.
945 OutputIsVariadic = IsVariadic;
947 if (NodeHasOptInFlag) {
948 emitCode("bool HasInFlag = "
949 "(N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag);");
952 emitCode("SmallVector<SDValue, 8> Ops" + utostr(OpcNo) + ";");
954 // How many results is this pattern expected to produce?
955 unsigned NumPatResults = 0;
956 for (unsigned i = 0, e = Pattern->getExtTypes().size(); i != e; i++) {
957 MVT::SimpleValueType VT = Pattern->getTypeNum(i);
958 if (VT != MVT::isVoid && VT != MVT::Flag)
962 if (OrigChains.size() > 0) {
963 // The original input chain is being ignored. If it is not just
964 // pointing to the op that's being folded, we should create a
965 // TokenFactor with it and the chain of the folded op as the new chain.
966 // We could potentially be doing multiple levels of folding, in that
967 // case, the TokenFactor can have more operands.
968 emitCode("SmallVector<SDValue, 8> InChains;");
969 for (unsigned i = 0, e = OrigChains.size(); i < e; ++i) {
970 emitCode("if (" + OrigChains[i].first + ".getNode() != " +
971 OrigChains[i].second + ".getNode()) {");
972 emitCode(" AddToISelQueue(" + OrigChains[i].first + ");");
973 emitCode(" InChains.push_back(" + OrigChains[i].first + ");");
976 emitCode("AddToISelQueue(" + ChainName + ");");
977 emitCode("InChains.push_back(" + ChainName + ");");
978 emitCode(ChainName + " = CurDAG->getNode(ISD::TokenFactor, MVT::Other, "
979 "&InChains[0], InChains.size());");
981 emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"yellow\");");
982 emitCode("CurDAG->setSubgraphColor(" + ChainName +".getNode(), \"black\");");
986 // Loop over all of the operands of the instruction pattern, emitting code
987 // to fill them all in. The node 'N' usually has number children equal to
988 // the number of input operands of the instruction. However, in cases
989 // where there are predicate operands for an instruction, we need to fill
990 // in the 'execute always' values. Match up the node operands to the
991 // instruction operands to do this.
992 std::vector<std::string> AllOps;
993 for (unsigned ChildNo = 0, InstOpNo = NumResults;
994 InstOpNo != II.OperandList.size(); ++InstOpNo) {
995 std::vector<std::string> Ops;
997 // Determine what to emit for this operand.
998 Record *OperandNode = II.OperandList[InstOpNo].Rec;
999 if ((OperandNode->isSubClassOf("PredicateOperand") ||
1000 OperandNode->isSubClassOf("OptionalDefOperand")) &&
1001 !CGP.getDefaultOperand(OperandNode).DefaultOps.empty()) {
1002 // This is a predicate or optional def operand; emit the
1003 // 'default ops' operands.
1004 const DAGDefaultOperand &DefaultOp =
1005 CGP.getDefaultOperand(II.OperandList[InstOpNo].Rec);
1006 for (unsigned i = 0, e = DefaultOp.DefaultOps.size(); i != e; ++i) {
1007 Ops = EmitResultCode(DefaultOp.DefaultOps[i], DstRegs,
1008 InFlagDecled, ResNodeDecled);
1009 AllOps.insert(AllOps.end(), Ops.begin(), Ops.end());
1012 // Otherwise this is a normal operand or a predicate operand without
1013 // 'execute always'; emit it.
1014 Ops = EmitResultCode(N->getChild(ChildNo), DstRegs,
1015 InFlagDecled, ResNodeDecled);
1016 AllOps.insert(AllOps.end(), Ops.begin(), Ops.end());
1021 // Emit all the chain and CopyToReg stuff.
1022 bool ChainEmitted = NodeHasChain;
1024 emitCode("AddToISelQueue(" + ChainName + ");");
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);");
1036 emitCode(" AddToISelQueue(InFlag);");
1041 unsigned ResNo = TmpNo++;
1043 unsigned OpsNo = OpcNo;
1044 std::string CodePrefix;
1045 bool ChainAssignmentNeeded = NodeHasChain && !isRoot;
1046 std::deque<std::string> After;
1047 std::string NodeName;
1049 NodeName = "Tmp" + utostr(ResNo);
1050 CodePrefix = "SDValue " + NodeName + "(";
1052 NodeName = "ResNode";
1053 if (!ResNodeDecled) {
1054 CodePrefix = "SDNode *" + NodeName + " = ";
1055 ResNodeDecled = true;
1057 CodePrefix = NodeName + " = ";
1060 std::string Code = "Opc" + utostr(OpcNo);
1062 emitOpcode(II.Namespace + "::" + II.TheDef->getName());
1064 // Output order: results, chain, flags
1066 if (NumResults > 0 && N->getTypeNum(0) != MVT::isVoid) {
1067 Code += ", VT" + utostr(VTNo);
1068 emitVT(getEnumName(N->getTypeNum(0)));
1070 // Add types for implicit results in physical registers, scheduler will
1071 // care of adding copyfromreg nodes.
1072 for (unsigned i = 0; i < NumDstRegs; i++) {
1073 Record *RR = DstRegs[i];
1074 if (RR->isSubClassOf("Register")) {
1075 MVT::SimpleValueType RVT = getRegisterValueType(RR, CGT);
1076 Code += ", " + getEnumName(RVT);
1080 Code += ", MVT::Other";
1082 Code += ", MVT::Flag";
1086 for (unsigned i = 0, e = AllOps.size(); i != e; ++i)
1087 emitCode("Ops" + utostr(OpsNo) + ".push_back(" + AllOps[i] + ");");
1090 // Figure out whether any operands at the end of the op list are not
1091 // part of the variable section.
1092 std::string EndAdjust;
1093 if (NodeHasInFlag || HasImpInputs)
1094 EndAdjust = "-1"; // Always has one flag.
1095 else if (NodeHasOptInFlag)
1096 EndAdjust = "-(HasInFlag?1:0)"; // May have a flag.
1098 emitCode("for (unsigned i = NumInputRootOps + " + utostr(NodeHasChain) +
1099 ", e = N.getNumOperands()" + EndAdjust + "; i != e; ++i) {");
1101 emitCode(" AddToISelQueue(N.getOperand(i));");
1102 emitCode(" Ops" + utostr(OpsNo) + ".push_back(N.getOperand(i));");
1106 // Generate MemOperandSDNodes nodes for each memory accesses covered by
1108 if (II.isSimpleLoad | II.mayLoad | II.mayStore) {
1109 std::vector<std::string>::const_iterator mi, mie;
1110 for (mi = LSI.begin(), mie = LSI.end(); mi != mie; ++mi) {
1111 std::string LSIName = "LSI_" + *mi;
1112 emitCode("SDValue " + LSIName + " = "
1113 "CurDAG->getMemOperand(cast<MemSDNode>(" +
1114 *mi + ")->getMemOperand());");
1116 emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"yellow\");");
1117 emitCode("CurDAG->setSubgraphColor(" + LSIName +".getNode(), \"black\");");
1120 emitCode("Ops" + utostr(OpsNo) + ".push_back(" + LSIName + ");");
1122 AllOps.push_back(LSIName);
1128 emitCode("Ops" + utostr(OpsNo) + ".push_back(" + ChainName + ");");
1130 AllOps.push_back(ChainName);
1134 if (NodeHasInFlag || HasImpInputs)
1135 emitCode("Ops" + utostr(OpsNo) + ".push_back(InFlag);");
1136 else if (NodeHasOptInFlag) {
1137 emitCode("if (HasInFlag)");
1138 emitCode(" Ops" + utostr(OpsNo) + ".push_back(InFlag);");
1140 Code += ", &Ops" + utostr(OpsNo) + "[0], Ops" + utostr(OpsNo) +
1142 } else if (NodeHasInFlag || NodeHasOptInFlag || HasImpInputs)
1143 AllOps.push_back("InFlag");
1145 unsigned NumOps = AllOps.size();
1147 if (!NodeHasOptInFlag && NumOps < 4) {
1148 for (unsigned i = 0; i != NumOps; ++i)
1149 Code += ", " + AllOps[i];
1151 std::string OpsCode = "SDValue Ops" + utostr(OpsNo) + "[] = { ";
1152 for (unsigned i = 0; i != NumOps; ++i) {
1153 OpsCode += AllOps[i];
1157 emitCode(OpsCode + " };");
1158 Code += ", Ops" + utostr(OpsNo) + ", ";
1159 if (NodeHasOptInFlag) {
1160 Code += "HasInFlag ? ";
1161 Code += utostr(NumOps) + " : " + utostr(NumOps-1);
1163 Code += utostr(NumOps);
1170 std::vector<std::string> ReplaceFroms;
1171 std::vector<std::string> ReplaceTos;
1173 NodeOps.push_back("Tmp" + utostr(ResNo));
1176 if (NodeHasOutFlag) {
1177 if (!InFlagDecled) {
1178 After.push_back("SDValue InFlag(ResNode, " +
1179 utostr(NumResults+NumDstRegs+(unsigned)NodeHasChain) +
1181 InFlagDecled = true;
1183 After.push_back("InFlag = SDValue(ResNode, " +
1184 utostr(NumResults+NumDstRegs+(unsigned)NodeHasChain) +
1188 if (FoldedChains.size() > 0) {
1190 for (unsigned j = 0, e = FoldedChains.size(); j < e; j++) {
1191 ReplaceFroms.push_back("SDValue(" +
1192 FoldedChains[j].first + ".getNode(), " +
1193 utostr(FoldedChains[j].second) +
1195 ReplaceTos.push_back("SDValue(ResNode, " +
1196 utostr(NumResults+NumDstRegs) + ")");
1200 if (NodeHasOutFlag) {
1201 if (FoldedFlag.first != "") {
1202 ReplaceFroms.push_back("SDValue(" + FoldedFlag.first + ".getNode(), " +
1203 utostr(FoldedFlag.second) + ")");
1204 ReplaceTos.push_back("InFlag");
1206 assert(NodeHasProperty(Pattern, SDNPOutFlag, CGP));
1207 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1208 utostr(NumPatResults + (unsigned)InputHasChain)
1210 ReplaceTos.push_back("InFlag");
1214 if (!ReplaceFroms.empty() && InputHasChain) {
1215 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1216 utostr(NumPatResults) + ")");
1217 ReplaceTos.push_back("SDValue(" + ChainName + ".getNode(), " +
1218 ChainName + ".getResNo()" + ")");
1219 ChainAssignmentNeeded |= NodeHasChain;
1222 // User does not expect the instruction would produce a chain!
1223 if ((!InputHasChain && NodeHasChain) && NodeHasOutFlag) {
1225 } else if (InputHasChain && !NodeHasChain) {
1226 // One of the inner node produces a chain.
1227 if (NodeHasOutFlag) {
1228 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1229 utostr(NumPatResults+1) +
1231 ReplaceTos.push_back("SDValue(ResNode, N.getResNo()-1)");
1233 ReplaceFroms.push_back("SDValue(N.getNode(), " +
1234 utostr(NumPatResults) + ")");
1235 ReplaceTos.push_back(ChainName);
1239 if (ChainAssignmentNeeded) {
1240 // Remember which op produces the chain.
1241 std::string ChainAssign;
1243 ChainAssign = ChainName + " = SDValue(" + NodeName +
1244 ".getNode(), " + utostr(NumResults+NumDstRegs) + ");";
1246 ChainAssign = ChainName + " = SDValue(" + NodeName +
1247 ", " + utostr(NumResults+NumDstRegs) + ");";
1249 After.push_front(ChainAssign);
1252 if (ReplaceFroms.size() == 1) {
1253 After.push_back("ReplaceUses(" + ReplaceFroms[0] + ", " +
1254 ReplaceTos[0] + ");");
1255 } else if (!ReplaceFroms.empty()) {
1256 After.push_back("const SDValue Froms[] = {");
1257 for (unsigned i = 0, e = ReplaceFroms.size(); i != e; ++i)
1258 After.push_back(" " + ReplaceFroms[i] + (i + 1 != e ? "," : ""));
1259 After.push_back("};");
1260 After.push_back("const SDValue Tos[] = {");
1261 for (unsigned i = 0, e = ReplaceFroms.size(); i != e; ++i)
1262 After.push_back(" " + ReplaceTos[i] + (i + 1 != e ? "," : ""));
1263 After.push_back("};");
1264 After.push_back("ReplaceUses(Froms, Tos, " +
1265 itostr(ReplaceFroms.size()) + ");");
1268 // We prefer to use SelectNodeTo since it avoids allocation when
1269 // possible and it avoids CSE map recalculation for the node's
1270 // users, however it's tricky to use in a non-root context.
1272 // We also don't use if the pattern replacement is being used to
1273 // jettison a chain result, since morphing the node in place
1274 // would leave users of the chain dangling.
1276 if (!isRoot || (InputHasChain && !NodeHasChain)) {
1277 Code = "CurDAG->getTargetNode(" + Code;
1279 Code = "CurDAG->SelectNodeTo(N.getNode(), " + Code;
1283 CodePrefix = "return ";
1285 After.push_back("return ResNode;");
1288 emitCode(CodePrefix + Code + ");");
1292 emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"yellow\");");
1293 emitCode("CurDAG->setSubgraphColor(" + NodeName +".getNode(), \"black\");");
1296 emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"yellow\");");
1297 emitCode("CurDAG->setSubgraphColor(" + NodeName +", \"black\");");
1301 for (unsigned i = 0, e = After.size(); i != e; ++i)
1306 if (Op->isSubClassOf("SDNodeXForm")) {
1307 assert(N->getNumChildren() == 1 && "node xform should have one child!");
1308 // PatLeaf node - the operand may or may not be a leaf node. But it should
1310 std::vector<std::string> Ops =
1311 EmitResultCode(N->getChild(0), DstRegs, InFlagDecled,
1312 ResNodeDecled, true);
1313 unsigned ResNo = TmpNo++;
1314 emitCode("SDValue Tmp" + utostr(ResNo) + " = Transform_" + Op->getName()
1315 + "(" + Ops.back() + ".getNode());");
1316 NodeOps.push_back("Tmp" + utostr(ResNo));
1318 emitCode("return Tmp" + utostr(ResNo) + ".getNode();");
1324 throw std::string("Unknown node in result pattern!");
1327 /// InsertOneTypeCheck - Insert a type-check for an unresolved type in 'Pat'
1328 /// and add it to the tree. 'Pat' and 'Other' are isomorphic trees except that
1329 /// 'Pat' may be missing types. If we find an unresolved type to add a check
1330 /// for, this returns true otherwise false if Pat has all types.
1331 bool InsertOneTypeCheck(TreePatternNode *Pat, TreePatternNode *Other,
1332 const std::string &Prefix, bool isRoot = false) {
1334 if (Pat->getExtTypes() != Other->getExtTypes()) {
1335 // Move a type over from 'other' to 'pat'.
1336 Pat->setTypes(Other->getExtTypes());
1337 // The top level node type is checked outside of the select function.
1339 emitCheck(Prefix + ".getNode()->getValueType(0) == " +
1340 getName(Pat->getTypeNum(0)));
1345 (unsigned) NodeHasProperty(Pat, SDNPHasChain, CGP);
1346 for (unsigned i = 0, e = Pat->getNumChildren(); i != e; ++i, ++OpNo)
1347 if (InsertOneTypeCheck(Pat->getChild(i), Other->getChild(i),
1348 Prefix + utostr(OpNo)))
1354 /// EmitInFlagSelectCode - Emit the flag operands for the DAG that is
1356 void EmitInFlagSelectCode(TreePatternNode *N, const std::string &RootName,
1357 bool &ChainEmitted, bool &InFlagDecled,
1358 bool &ResNodeDecled, bool isRoot = false) {
1359 const CodeGenTarget &T = CGP.getTargetInfo();
1361 (unsigned) NodeHasProperty(N, SDNPHasChain, CGP);
1362 bool HasInFlag = NodeHasProperty(N, SDNPInFlag, CGP);
1363 for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
1364 TreePatternNode *Child = N->getChild(i);
1365 if (!Child->isLeaf()) {
1366 EmitInFlagSelectCode(Child, RootName + utostr(OpNo), ChainEmitted,
1367 InFlagDecled, ResNodeDecled);
1369 if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
1370 if (!Child->getName().empty()) {
1371 std::string Name = RootName + utostr(OpNo);
1372 if (Duplicates.find(Name) != Duplicates.end())
1373 // A duplicate! Do not emit a copy for this node.
1377 Record *RR = DI->getDef();
1378 if (RR->isSubClassOf("Register")) {
1379 MVT::SimpleValueType RVT = getRegisterValueType(RR, T);
1380 if (RVT == MVT::Flag) {
1381 if (!InFlagDecled) {
1382 emitCode("SDValue InFlag = " + RootName + utostr(OpNo) + ";");
1383 InFlagDecled = true;
1385 emitCode("InFlag = " + RootName + utostr(OpNo) + ";");
1386 emitCode("AddToISelQueue(InFlag);");
1388 if (!ChainEmitted) {
1389 emitCode("SDValue Chain = CurDAG->getEntryNode();");
1390 ChainName = "Chain";
1391 ChainEmitted = true;
1393 emitCode("AddToISelQueue(" + RootName + utostr(OpNo) + ");");
1394 if (!InFlagDecled) {
1395 emitCode("SDValue InFlag(0, 0);");
1396 InFlagDecled = true;
1398 std::string Decl = (!ResNodeDecled) ? "SDNode *" : "";
1399 emitCode(Decl + "ResNode = CurDAG->getCopyToReg(" + ChainName +
1400 ", " + getQualifiedName(RR) +
1401 ", " + RootName + utostr(OpNo) + ", InFlag).getNode();");
1402 ResNodeDecled = true;
1403 emitCode(ChainName + " = SDValue(ResNode, 0);");
1404 emitCode("InFlag = SDValue(ResNode, 1);");
1412 if (!InFlagDecled) {
1413 emitCode("SDValue InFlag = " + RootName +
1414 ".getOperand(" + utostr(OpNo) + ");");
1415 InFlagDecled = true;
1417 emitCode("InFlag = " + RootName +
1418 ".getOperand(" + utostr(OpNo) + ");");
1419 emitCode("AddToISelQueue(InFlag);");
1424 /// EmitCodeForPattern - Given a pattern to match, emit code to the specified
1425 /// stream to match the pattern, and generate the code for the match if it
1426 /// succeeds. Returns true if the pattern is not guaranteed to match.
1427 void DAGISelEmitter::GenerateCodeForPattern(const PatternToMatch &Pattern,
1428 std::vector<std::pair<unsigned, std::string> > &GeneratedCode,
1429 std::set<std::string> &GeneratedDecl,
1430 std::vector<std::string> &TargetOpcodes,
1431 std::vector<std::string> &TargetVTs,
1432 bool &OutputIsVariadic,
1433 unsigned &NumInputRootOps) {
1434 OutputIsVariadic = false;
1435 NumInputRootOps = 0;
1437 PatternCodeEmitter Emitter(CGP, Pattern.getPredicateCheck(),
1438 Pattern.getSrcPattern(), Pattern.getDstPattern(),
1439 GeneratedCode, GeneratedDecl,
1440 TargetOpcodes, TargetVTs,
1441 OutputIsVariadic, NumInputRootOps);
1443 // Emit the matcher, capturing named arguments in VariableMap.
1444 bool FoundChain = false;
1445 Emitter.EmitMatchCode(Pattern.getSrcPattern(), NULL, "N", "", FoundChain);
1447 // TP - Get *SOME* tree pattern, we don't care which.
1448 TreePattern &TP = *CGP.pf_begin()->second;
1450 // At this point, we know that we structurally match the pattern, but the
1451 // types of the nodes may not match. Figure out the fewest number of type
1452 // comparisons we need to emit. For example, if there is only one integer
1453 // type supported by a target, there should be no type comparisons at all for
1454 // integer patterns!
1456 // To figure out the fewest number of type checks needed, clone the pattern,
1457 // remove the types, then perform type inference on the pattern as a whole.
1458 // If there are unresolved types, emit an explicit check for those types,
1459 // apply the type to the tree, then rerun type inference. Iterate until all
1460 // types are resolved.
1462 TreePatternNode *Pat = Pattern.getSrcPattern()->clone();
1463 RemoveAllTypes(Pat);
1466 // Resolve/propagate as many types as possible.
1468 bool MadeChange = true;
1470 MadeChange = Pat->ApplyTypeConstraints(TP,
1471 true/*Ignore reg constraints*/);
1473 assert(0 && "Error: could not find consistent types for something we"
1474 " already decided was ok!");
1478 // Insert a check for an unresolved type and add it to the tree. If we find
1479 // an unresolved type to add a check for, this returns true and we iterate,
1480 // otherwise we are done.
1481 } while (Emitter.InsertOneTypeCheck(Pat, Pattern.getSrcPattern(), "N", true));
1483 Emitter.EmitResultCode(Pattern.getDstPattern(), Pattern.getDstRegs(),
1484 false, false, false, true);
1488 /// EraseCodeLine - Erase one code line from all of the patterns. If removing
1489 /// a line causes any of them to be empty, remove them and return true when
1491 static bool EraseCodeLine(std::vector<std::pair<const PatternToMatch*,
1492 std::vector<std::pair<unsigned, std::string> > > >
1494 bool ErasedPatterns = false;
1495 for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
1496 Patterns[i].second.pop_back();
1497 if (Patterns[i].second.empty()) {
1498 Patterns.erase(Patterns.begin()+i);
1500 ErasedPatterns = true;
1503 return ErasedPatterns;
1506 /// EmitPatterns - Emit code for at least one pattern, but try to group common
1507 /// code together between the patterns.
1508 void DAGISelEmitter::EmitPatterns(std::vector<std::pair<const PatternToMatch*,
1509 std::vector<std::pair<unsigned, std::string> > > >
1510 &Patterns, unsigned Indent,
1512 typedef std::pair<unsigned, std::string> CodeLine;
1513 typedef std::vector<CodeLine> CodeList;
1514 typedef std::vector<std::pair<const PatternToMatch*, CodeList> > PatternList;
1516 if (Patterns.empty()) return;
1518 // Figure out how many patterns share the next code line. Explicitly copy
1519 // FirstCodeLine so that we don't invalidate a reference when changing
1521 const CodeLine FirstCodeLine = Patterns.back().second.back();
1522 unsigned LastMatch = Patterns.size()-1;
1523 while (LastMatch != 0 && Patterns[LastMatch-1].second.back() == FirstCodeLine)
1526 // If not all patterns share this line, split the list into two pieces. The
1527 // first chunk will use this line, the second chunk won't.
1528 if (LastMatch != 0) {
1529 PatternList Shared(Patterns.begin()+LastMatch, Patterns.end());
1530 PatternList Other(Patterns.begin(), Patterns.begin()+LastMatch);
1532 // FIXME: Emit braces?
1533 if (Shared.size() == 1) {
1534 const PatternToMatch &Pattern = *Shared.back().first;
1535 OS << "\n" << std::string(Indent, ' ') << "// Pattern: ";
1536 Pattern.getSrcPattern()->print(OS);
1537 OS << "\n" << std::string(Indent, ' ') << "// Emits: ";
1538 Pattern.getDstPattern()->print(OS);
1540 unsigned AddedComplexity = Pattern.getAddedComplexity();
1541 OS << std::string(Indent, ' ') << "// Pattern complexity = "
1542 << getPatternSize(Pattern.getSrcPattern(), CGP) + AddedComplexity
1544 << getResultPatternCost(Pattern.getDstPattern(), CGP)
1546 << getResultPatternSize(Pattern.getDstPattern(), CGP) << "\n";
1548 if (FirstCodeLine.first != 1) {
1549 OS << std::string(Indent, ' ') << "{\n";
1552 EmitPatterns(Shared, Indent, OS);
1553 if (FirstCodeLine.first != 1) {
1555 OS << std::string(Indent, ' ') << "}\n";
1558 if (Other.size() == 1) {
1559 const PatternToMatch &Pattern = *Other.back().first;
1560 OS << "\n" << std::string(Indent, ' ') << "// Pattern: ";
1561 Pattern.getSrcPattern()->print(OS);
1562 OS << "\n" << std::string(Indent, ' ') << "// Emits: ";
1563 Pattern.getDstPattern()->print(OS);
1565 unsigned AddedComplexity = Pattern.getAddedComplexity();
1566 OS << std::string(Indent, ' ') << "// Pattern complexity = "
1567 << getPatternSize(Pattern.getSrcPattern(), CGP) + AddedComplexity
1569 << getResultPatternCost(Pattern.getDstPattern(), CGP)
1571 << getResultPatternSize(Pattern.getDstPattern(), CGP) << "\n";
1573 EmitPatterns(Other, Indent, OS);
1577 // Remove this code from all of the patterns that share it.
1578 bool ErasedPatterns = EraseCodeLine(Patterns);
1580 bool isPredicate = FirstCodeLine.first == 1;
1582 // Otherwise, every pattern in the list has this line. Emit it.
1585 OS << std::string(Indent, ' ') << FirstCodeLine.second << "\n";
1587 OS << std::string(Indent, ' ') << "if (" << FirstCodeLine.second;
1589 // If the next code line is another predicate, and if all of the pattern
1590 // in this group share the same next line, emit it inline now. Do this
1591 // until we run out of common predicates.
1592 while (!ErasedPatterns && Patterns.back().second.back().first == 1) {
1593 // Check that all of fhe patterns in Patterns end with the same predicate.
1594 bool AllEndWithSamePredicate = true;
1595 for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
1596 if (Patterns[i].second.back() != Patterns.back().second.back()) {
1597 AllEndWithSamePredicate = false;
1600 // If all of the predicates aren't the same, we can't share them.
1601 if (!AllEndWithSamePredicate) break;
1603 // Otherwise we can. Emit it shared now.
1604 OS << " &&\n" << std::string(Indent+4, ' ')
1605 << Patterns.back().second.back().second;
1606 ErasedPatterns = EraseCodeLine(Patterns);
1613 EmitPatterns(Patterns, Indent, OS);
1616 OS << std::string(Indent-2, ' ') << "}\n";
1619 static std::string getLegalCName(std::string OpName) {
1620 std::string::size_type pos = OpName.find("::");
1621 if (pos != std::string::npos)
1622 OpName.replace(pos, 2, "_");
1626 void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
1627 const CodeGenTarget &Target = CGP.getTargetInfo();
1629 // Get the namespace to insert instructions into.
1630 std::string InstNS = Target.getInstNamespace();
1631 if (!InstNS.empty()) InstNS += "::";
1633 // Group the patterns by their top-level opcodes.
1634 std::map<std::string, std::vector<const PatternToMatch*> > PatternsByOpcode;
1635 // All unique target node emission functions.
1636 std::map<std::string, unsigned> EmitFunctions;
1637 for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(),
1638 E = CGP.ptm_end(); I != E; ++I) {
1639 const PatternToMatch &Pattern = *I;
1641 TreePatternNode *Node = Pattern.getSrcPattern();
1642 if (!Node->isLeaf()) {
1643 PatternsByOpcode[getOpcodeName(Node->getOperator(), CGP)].
1644 push_back(&Pattern);
1646 const ComplexPattern *CP;
1647 if (dynamic_cast<IntInit*>(Node->getLeafValue())) {
1648 PatternsByOpcode[getOpcodeName(CGP.getSDNodeNamed("imm"), CGP)].
1649 push_back(&Pattern);
1650 } else if ((CP = NodeGetComplexPattern(Node, CGP))) {
1651 std::vector<Record*> OpNodes = CP->getRootNodes();
1652 for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
1653 PatternsByOpcode[getOpcodeName(OpNodes[j], CGP)]
1654 .insert(PatternsByOpcode[getOpcodeName(OpNodes[j], CGP)].begin(),
1658 cerr << "Unrecognized opcode '";
1660 cerr << "' on tree pattern '";
1661 cerr << Pattern.getDstPattern()->getOperator()->getName() << "'!\n";
1667 // For each opcode, there might be multiple select functions, one per
1668 // ValueType of the node (or its first operand if it doesn't produce a
1669 // non-chain result.
1670 std::map<std::string, std::vector<std::string> > OpcodeVTMap;
1672 // Emit one Select_* method for each top-level opcode. We do this instead of
1673 // emitting one giant switch statement to support compilers where this will
1674 // result in the recursive functions taking less stack space.
1675 for (std::map<std::string, std::vector<const PatternToMatch*> >::iterator
1676 PBOI = PatternsByOpcode.begin(), E = PatternsByOpcode.end();
1677 PBOI != E; ++PBOI) {
1678 const std::string &OpName = PBOI->first;
1679 std::vector<const PatternToMatch*> &PatternsOfOp = PBOI->second;
1680 assert(!PatternsOfOp.empty() && "No patterns but map has entry?");
1682 // Split them into groups by type.
1683 std::map<MVT::SimpleValueType,
1684 std::vector<const PatternToMatch*> > PatternsByType;
1685 for (unsigned i = 0, e = PatternsOfOp.size(); i != e; ++i) {
1686 const PatternToMatch *Pat = PatternsOfOp[i];
1687 TreePatternNode *SrcPat = Pat->getSrcPattern();
1688 PatternsByType[SrcPat->getTypeNum(0)].push_back(Pat);
1691 for (std::map<MVT::SimpleValueType,
1692 std::vector<const PatternToMatch*> >::iterator
1693 II = PatternsByType.begin(), EE = PatternsByType.end(); II != EE;
1695 MVT::SimpleValueType OpVT = II->first;
1696 std::vector<const PatternToMatch*> &Patterns = II->second;
1697 typedef std::pair<unsigned, std::string> CodeLine;
1698 typedef std::vector<CodeLine> CodeList;
1699 typedef CodeList::iterator CodeListI;
1701 std::vector<std::pair<const PatternToMatch*, CodeList> > CodeForPatterns;
1702 std::vector<std::vector<std::string> > PatternOpcodes;
1703 std::vector<std::vector<std::string> > PatternVTs;
1704 std::vector<std::set<std::string> > PatternDecls;
1705 std::vector<bool> OutputIsVariadicFlags;
1706 std::vector<unsigned> NumInputRootOpsCounts;
1707 for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
1708 CodeList GeneratedCode;
1709 std::set<std::string> GeneratedDecl;
1710 std::vector<std::string> TargetOpcodes;
1711 std::vector<std::string> TargetVTs;
1712 bool OutputIsVariadic;
1713 unsigned NumInputRootOps;
1714 GenerateCodeForPattern(*Patterns[i], GeneratedCode, GeneratedDecl,
1715 TargetOpcodes, TargetVTs,
1716 OutputIsVariadic, NumInputRootOps);
1717 CodeForPatterns.push_back(std::make_pair(Patterns[i], GeneratedCode));
1718 PatternDecls.push_back(GeneratedDecl);
1719 PatternOpcodes.push_back(TargetOpcodes);
1720 PatternVTs.push_back(TargetVTs);
1721 OutputIsVariadicFlags.push_back(OutputIsVariadic);
1722 NumInputRootOpsCounts.push_back(NumInputRootOps);
1725 // Factor target node emission code (emitted by EmitResultCode) into
1726 // separate functions. Uniquing and share them among all instruction
1727 // selection routines.
1728 for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
1729 CodeList &GeneratedCode = CodeForPatterns[i].second;
1730 std::vector<std::string> &TargetOpcodes = PatternOpcodes[i];
1731 std::vector<std::string> &TargetVTs = PatternVTs[i];
1732 std::set<std::string> Decls = PatternDecls[i];
1733 bool OutputIsVariadic = OutputIsVariadicFlags[i];
1734 unsigned NumInputRootOps = NumInputRootOpsCounts[i];
1735 std::vector<std::string> AddedInits;
1736 int CodeSize = (int)GeneratedCode.size();
1738 for (int j = CodeSize-1; j >= 0; --j) {
1739 if (LastPred == -1 && GeneratedCode[j].first == 1)
1741 else if (LastPred != -1 && GeneratedCode[j].first == 2)
1742 AddedInits.push_back(GeneratedCode[j].second);
1745 std::string CalleeCode = "(const SDValue &N";
1746 std::string CallerCode = "(N";
1747 for (unsigned j = 0, e = TargetOpcodes.size(); j != e; ++j) {
1748 CalleeCode += ", unsigned Opc" + utostr(j);
1749 CallerCode += ", " + TargetOpcodes[j];
1751 for (unsigned j = 0, e = TargetVTs.size(); j != e; ++j) {
1752 CalleeCode += ", MVT VT" + utostr(j);
1753 CallerCode += ", " + TargetVTs[j];
1755 for (std::set<std::string>::iterator
1756 I = Decls.begin(), E = Decls.end(); I != E; ++I) {
1757 std::string Name = *I;
1758 CalleeCode += ", SDValue &" + Name;
1759 CallerCode += ", " + Name;
1762 if (OutputIsVariadic) {
1763 CalleeCode += ", unsigned NumInputRootOps";
1764 CallerCode += ", " + utostr(NumInputRootOps);
1769 // Prevent emission routines from being inlined to reduce selection
1770 // routines stack frame sizes.
1771 CalleeCode += "DISABLE_INLINE ";
1772 CalleeCode += "{\n";
1774 for (std::vector<std::string>::const_reverse_iterator
1775 I = AddedInits.rbegin(), E = AddedInits.rend(); I != E; ++I)
1776 CalleeCode += " " + *I + "\n";
1778 for (int j = LastPred+1; j < CodeSize; ++j)
1779 CalleeCode += " " + GeneratedCode[j].second + "\n";
1780 for (int j = LastPred+1; j < CodeSize; ++j)
1781 GeneratedCode.pop_back();
1782 CalleeCode += "}\n";
1784 // Uniquing the emission routines.
1785 unsigned EmitFuncNum;
1786 std::map<std::string, unsigned>::iterator EFI =
1787 EmitFunctions.find(CalleeCode);
1788 if (EFI != EmitFunctions.end()) {
1789 EmitFuncNum = EFI->second;
1791 EmitFuncNum = EmitFunctions.size();
1792 EmitFunctions.insert(std::make_pair(CalleeCode, EmitFuncNum));
1793 OS << "SDNode *Emit_" << utostr(EmitFuncNum) << CalleeCode;
1796 // Replace the emission code within selection routines with calls to the
1797 // emission functions.
1799 GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"red\");"));
1801 CallerCode = "SDNode *Result = Emit_" + utostr(EmitFuncNum) + CallerCode;
1802 GeneratedCode.push_back(std::make_pair(3, CallerCode));
1804 GeneratedCode.push_back(std::make_pair(0, "if(Result) {"));
1805 GeneratedCode.push_back(std::make_pair(0, " CurDAG->setSubgraphColor(Result, \"yellow\");"));
1806 GeneratedCode.push_back(std::make_pair(0, " CurDAG->setSubgraphColor(Result, \"black\");"));
1807 GeneratedCode.push_back(std::make_pair(0, "}"));
1808 //GeneratedCode.push_back(std::make_pair(0, "CurDAG->setSubgraphColor(N.getNode(), \"black\");"));
1810 GeneratedCode.push_back(std::make_pair(0, "return Result;"));
1814 std::string OpVTStr;
1815 if (OpVT == MVT::iPTR) {
1817 } else if (OpVT == MVT::iPTRAny) {
1818 OpVTStr = "_iPTRAny";
1819 } else if (OpVT == MVT::isVoid) {
1820 // Nodes with a void result actually have a first result type of either
1821 // Other (a chain) or Flag. Since there is no one-to-one mapping from
1822 // void to this case, we handle it specially here.
1824 OpVTStr = "_" + getEnumName(OpVT).substr(5); // Skip 'MVT::'
1826 std::map<std::string, std::vector<std::string> >::iterator OpVTI =
1827 OpcodeVTMap.find(OpName);
1828 if (OpVTI == OpcodeVTMap.end()) {
1829 std::vector<std::string> VTSet;
1830 VTSet.push_back(OpVTStr);
1831 OpcodeVTMap.insert(std::make_pair(OpName, VTSet));
1833 OpVTI->second.push_back(OpVTStr);
1835 OS << "SDNode *Select_" << getLegalCName(OpName)
1836 << OpVTStr << "(const SDValue &N) {\n";
1838 // We want to emit all of the matching code now. However, we want to emit
1839 // the matches in order of minimal cost. Sort the patterns so the least
1840 // cost one is at the start.
1841 std::stable_sort(CodeForPatterns.begin(), CodeForPatterns.end(),
1842 PatternSortingPredicate(CGP));
1844 // Scan the code to see if all of the patterns are reachable and if it is
1845 // possible that the last one might not match.
1846 bool mightNotMatch = true;
1847 for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
1848 CodeList &GeneratedCode = CodeForPatterns[i].second;
1849 mightNotMatch = false;
1851 for (unsigned j = 0, e = GeneratedCode.size(); j != e; ++j) {
1852 if (GeneratedCode[j].first == 1) { // predicate.
1853 mightNotMatch = true;
1858 // If this pattern definitely matches, and if it isn't the last one, the
1859 // patterns after it CANNOT ever match. Error out.
1860 if (mightNotMatch == false && i != CodeForPatterns.size()-1) {
1861 cerr << "Pattern '";
1862 CodeForPatterns[i].first->getSrcPattern()->print(*cerr.stream());
1863 cerr << "' is impossible to select!\n";
1868 // Loop through and reverse all of the CodeList vectors, as we will be
1869 // accessing them from their logical front, but accessing the end of a
1870 // vector is more efficient.
1871 for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
1872 CodeList &GeneratedCode = CodeForPatterns[i].second;
1873 std::reverse(GeneratedCode.begin(), GeneratedCode.end());
1876 // Next, reverse the list of patterns itself for the same reason.
1877 std::reverse(CodeForPatterns.begin(), CodeForPatterns.end());
1879 // Emit all of the patterns now, grouped together to share code.
1880 EmitPatterns(CodeForPatterns, 2, OS);
1882 // If the last pattern has predicates (which could fail) emit code to
1883 // catch the case where nothing handles a pattern.
1884 if (mightNotMatch) {
1886 if (OpName != "ISD::INTRINSIC_W_CHAIN" &&
1887 OpName != "ISD::INTRINSIC_WO_CHAIN" &&
1888 OpName != "ISD::INTRINSIC_VOID")
1889 OS << " CannotYetSelect(N);\n";
1891 OS << " CannotYetSelectIntrinsic(N);\n";
1893 OS << " return NULL;\n";
1899 // Emit boilerplate.
1900 OS << "SDNode *Select_INLINEASM(SDValue N) {\n"
1901 << " std::vector<SDValue> Ops(N.getNode()->op_begin(), N.getNode()->op_end());\n"
1902 << " SelectInlineAsmMemoryOperands(Ops);\n\n"
1904 << " // Ensure that the asm operands are themselves selected.\n"
1905 << " for (unsigned j = 0, e = Ops.size(); j != e; ++j)\n"
1906 << " AddToISelQueue(Ops[j]);\n\n"
1908 << " std::vector<MVT> VTs;\n"
1909 << " VTs.push_back(MVT::Other);\n"
1910 << " VTs.push_back(MVT::Flag);\n"
1911 << " SDValue New = CurDAG->getNode(ISD::INLINEASM, VTs, &Ops[0], "
1913 << " return New.getNode();\n"
1916 OS << "SDNode *Select_UNDEF(const SDValue &N) {\n"
1917 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::IMPLICIT_DEF,\n"
1918 << " N.getValueType());\n"
1921 OS << "SDNode *Select_DBG_LABEL(const SDValue &N) {\n"
1922 << " SDValue Chain = N.getOperand(0);\n"
1923 << " unsigned C = cast<LabelSDNode>(N)->getLabelID();\n"
1924 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1925 << " AddToISelQueue(Chain);\n"
1926 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::DBG_LABEL,\n"
1927 << " MVT::Other, Tmp, Chain);\n"
1930 OS << "SDNode *Select_EH_LABEL(const SDValue &N) {\n"
1931 << " SDValue Chain = N.getOperand(0);\n"
1932 << " unsigned C = cast<LabelSDNode>(N)->getLabelID();\n"
1933 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1934 << " AddToISelQueue(Chain);\n"
1935 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::EH_LABEL,\n"
1936 << " MVT::Other, Tmp, Chain);\n"
1939 OS << "SDNode *Select_DECLARE(const SDValue &N) {\n"
1940 << " SDValue Chain = N.getOperand(0);\n"
1941 << " SDValue N1 = N.getOperand(1);\n"
1942 << " SDValue N2 = N.getOperand(2);\n"
1943 << " if (!isa<FrameIndexSDNode>(N1) || !isa<GlobalAddressSDNode>(N2)) {\n"
1944 << " CannotYetSelect(N);\n"
1946 << " int FI = cast<FrameIndexSDNode>(N1)->getIndex();\n"
1947 << " GlobalValue *GV = cast<GlobalAddressSDNode>(N2)->getGlobal();\n"
1948 << " SDValue Tmp1 = "
1949 << "CurDAG->getTargetFrameIndex(FI, TLI.getPointerTy());\n"
1950 << " SDValue Tmp2 = "
1951 << "CurDAG->getTargetGlobalAddress(GV, TLI.getPointerTy());\n"
1952 << " AddToISelQueue(Chain);\n"
1953 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::DECLARE,\n"
1954 << " MVT::Other, Tmp1, Tmp2, Chain);\n"
1957 OS << "SDNode *Select_EXTRACT_SUBREG(const SDValue &N) {\n"
1958 << " SDValue N0 = N.getOperand(0);\n"
1959 << " SDValue N1 = N.getOperand(1);\n"
1960 << " unsigned C = cast<ConstantSDNode>(N1)->getZExtValue();\n"
1961 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1962 << " AddToISelQueue(N0);\n"
1963 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::EXTRACT_SUBREG,\n"
1964 << " N.getValueType(), N0, Tmp);\n"
1967 OS << "SDNode *Select_INSERT_SUBREG(const SDValue &N) {\n"
1968 << " SDValue N0 = N.getOperand(0);\n"
1969 << " SDValue N1 = N.getOperand(1);\n"
1970 << " SDValue N2 = N.getOperand(2);\n"
1971 << " unsigned C = cast<ConstantSDNode>(N2)->getZExtValue();\n"
1972 << " SDValue Tmp = CurDAG->getTargetConstant(C, MVT::i32);\n"
1973 << " AddToISelQueue(N1);\n"
1974 << " AddToISelQueue(N0);\n"
1975 << " return CurDAG->SelectNodeTo(N.getNode(), TargetInstrInfo::INSERT_SUBREG,\n"
1976 << " N.getValueType(), N0, N1, Tmp);\n"
1979 OS << "// The main instruction selector code.\n"
1980 << "SDNode *SelectCode(SDValue N) {\n"
1981 << " if (N.isMachineOpcode()) {\n"
1982 << " return NULL; // Already selected.\n"
1984 << " MVT::SimpleValueType NVT = N.getNode()->getValueType(0).getSimpleVT();\n"
1985 << " switch (N.getOpcode()) {\n"
1986 << " default: break;\n"
1987 << " case ISD::EntryToken: // These leaves remain the same.\n"
1988 << " case ISD::BasicBlock:\n"
1989 << " case ISD::Register:\n"
1990 << " case ISD::HANDLENODE:\n"
1991 << " case ISD::TargetConstant:\n"
1992 << " case ISD::TargetConstantFP:\n"
1993 << " case ISD::TargetConstantPool:\n"
1994 << " case ISD::TargetFrameIndex:\n"
1995 << " case ISD::TargetExternalSymbol:\n"
1996 << " case ISD::TargetJumpTable:\n"
1997 << " case ISD::TargetGlobalTLSAddress:\n"
1998 << " case ISD::TargetGlobalAddress: {\n"
1999 << " return NULL;\n"
2001 << " case ISD::AssertSext:\n"
2002 << " case ISD::AssertZext: {\n"
2003 << " AddToISelQueue(N.getOperand(0));\n"
2004 << " ReplaceUses(N, N.getOperand(0));\n"
2005 << " return NULL;\n"
2007 << " case ISD::TokenFactor:\n"
2008 << " case ISD::CopyFromReg:\n"
2009 << " case ISD::CopyToReg: {\n"
2010 << " for (unsigned i = 0, e = N.getNumOperands(); i != e; ++i)\n"
2011 << " AddToISelQueue(N.getOperand(i));\n"
2012 << " return NULL;\n"
2014 << " case ISD::INLINEASM: return Select_INLINEASM(N);\n"
2015 << " case ISD::DBG_LABEL: return Select_DBG_LABEL(N);\n"
2016 << " case ISD::EH_LABEL: return Select_EH_LABEL(N);\n"
2017 << " case ISD::DECLARE: return Select_DECLARE(N);\n"
2018 << " case ISD::EXTRACT_SUBREG: return Select_EXTRACT_SUBREG(N);\n"
2019 << " case ISD::INSERT_SUBREG: return Select_INSERT_SUBREG(N);\n"
2020 << " case ISD::UNDEF: return Select_UNDEF(N);\n";
2022 // Loop over all of the case statements, emiting a call to each method we
2024 for (std::map<std::string, std::vector<const PatternToMatch*> >::iterator
2025 PBOI = PatternsByOpcode.begin(), E = PatternsByOpcode.end();
2026 PBOI != E; ++PBOI) {
2027 const std::string &OpName = PBOI->first;
2028 // Potentially multiple versions of select for this opcode. One for each
2029 // ValueType of the node (or its first true operand if it doesn't produce a
2031 std::map<std::string, std::vector<std::string> >::iterator OpVTI =
2032 OpcodeVTMap.find(OpName);
2033 std::vector<std::string> &OpVTs = OpVTI->second;
2034 OS << " case " << OpName << ": {\n";
2035 // Keep track of whether we see a pattern that has an iPtr result.
2036 bool HasPtrPattern = false;
2037 bool HasDefaultPattern = false;
2039 OS << " switch (NVT) {\n";
2040 for (unsigned i = 0, e = OpVTs.size(); i < e; ++i) {
2041 std::string &VTStr = OpVTs[i];
2042 if (VTStr.empty()) {
2043 HasDefaultPattern = true;
2047 // If this is a match on iPTR: don't emit it directly, we need special
2049 if (VTStr == "_iPTR") {
2050 HasPtrPattern = true;
2053 OS << " case MVT::" << VTStr.substr(1) << ":\n"
2054 << " return Select_" << getLegalCName(OpName)
2055 << VTStr << "(N);\n";
2057 OS << " default:\n";
2059 // If there is an iPTR result version of this pattern, emit it here.
2060 if (HasPtrPattern) {
2061 OS << " if (TLI.getPointerTy() == NVT)\n";
2062 OS << " return Select_" << getLegalCName(OpName) <<"_iPTR(N);\n";
2064 if (HasDefaultPattern) {
2065 OS << " return Select_" << getLegalCName(OpName) << "(N);\n";
2073 OS << " } // end of big switch.\n\n"
2074 << " if (N.getOpcode() != ISD::INTRINSIC_W_CHAIN &&\n"
2075 << " N.getOpcode() != ISD::INTRINSIC_WO_CHAIN &&\n"
2076 << " N.getOpcode() != ISD::INTRINSIC_VOID) {\n"
2077 << " CannotYetSelect(N);\n"
2079 << " CannotYetSelectIntrinsic(N);\n"
2081 << " return NULL;\n"
2084 OS << "void CannotYetSelect(SDValue N) DISABLE_INLINE {\n"
2085 << " cerr << \"Cannot yet select: \";\n"
2086 << " N.getNode()->dump(CurDAG);\n"
2087 << " cerr << '\\n';\n"
2091 OS << "void CannotYetSelectIntrinsic(SDValue N) DISABLE_INLINE {\n"
2092 << " cerr << \"Cannot yet select: \";\n"
2093 << " unsigned iid = cast<ConstantSDNode>(N.getOperand("
2094 << "N.getOperand(0).getValueType() == MVT::Other))->getZExtValue();\n"
2095 << " cerr << \"intrinsic %\"<< "
2096 << "Intrinsic::getName((Intrinsic::ID)iid);\n"
2097 << " cerr << '\\n';\n"
2102 void DAGISelEmitter::run(std::ostream &OS) {
2103 EmitSourceFileHeader("DAG Instruction Selector for the " +
2104 CGP.getTargetInfo().getName() + " target", OS);
2106 OS << "// *** NOTE: This file is #included into the middle of the target\n"
2107 << "// *** instruction selector class. These functions are really "
2110 OS << "// Include standard, target-independent definitions and methods used\n"
2111 << "// by the instruction selector.\n";
2112 OS << "#include <llvm/CodeGen/DAGISelHeader.h>\n\n";
2114 EmitNodeTransforms(OS);
2115 EmitPredicateFunctions(OS);
2117 DOUT << "\n\nALL PATTERNS TO MATCH:\n\n";
2118 for (CodeGenDAGPatterns::ptm_iterator I = CGP.ptm_begin(), E = CGP.ptm_end();
2120 DOUT << "PATTERN: "; DEBUG(I->getSrcPattern()->dump());
2121 DOUT << "\nRESULT: "; DEBUG(I->getDstPattern()->dump());
2125 // At this point, we have full information about the 'Patterns' we need to
2126 // parse, both implicitly from instructions as well as from explicit pattern
2127 // definitions. Emit the resultant instruction selector.
2128 EmitInstructionSelector(OS);