1 //===- DAGISelMatcherEmitter.cpp - Matcher Emitter ------------------------===//
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 file contains code to generate C++ code a matcher.
12 //===----------------------------------------------------------------------===//
14 #include "DAGISelMatcher.h"
15 #include "CodeGenDAGPatterns.h"
17 #include "llvm/ADT/DenseMap.h"
18 #include "llvm/ADT/SmallString.h"
19 #include "llvm/ADT/StringMap.h"
20 #include "llvm/Support/FormattedStream.h"
29 /// ClassifyInt - Classify an integer by size, return '1','2','4','8' if this
30 /// fits in 1, 2, 4, or 8 sign extended bytes.
31 static char ClassifyInt(int64_t Val) {
32 if (Val == int8_t(Val)) return '1';
33 if (Val == int16_t(Val)) return '2';
34 if (Val == int32_t(Val)) return '4';
38 /// EmitInt - Emit the specified integer, returning the number of bytes emitted.
39 static unsigned EmitInt(int64_t Val, formatted_raw_ostream &OS) {
40 unsigned BytesEmitted = 1;
41 OS << (int)(unsigned char)Val << ", ";
42 if (Val == int8_t(Val)) {
47 OS << (int)(unsigned char)(Val >> 8) << ", ";
50 if (Val != int16_t(Val)) {
51 OS << (int)(unsigned char)(Val >> 16) << ", "
52 << (int)(unsigned char)(Val >> 24) << ", ";
55 if (Val != int32_t(Val)) {
56 OS << (int)(unsigned char)(Val >> 32) << ", "
57 << (int)(unsigned char)(Val >> 40) << ", "
58 << (int)(unsigned char)(Val >> 48) << ", "
59 << (int)(unsigned char)(Val >> 56) << ", ";
64 OS.PadToColumn(CommentIndent) << "// " << Val << " aka 0x";
65 OS.write_hex(Val) << '\n';
70 class MatcherTableEmitter {
71 StringMap<unsigned> NodePredicateMap, PatternPredicateMap;
72 std::vector<std::string> NodePredicates, PatternPredicates;
74 DenseMap<const ComplexPattern*, unsigned> ComplexPatternMap;
75 std::vector<const ComplexPattern*> ComplexPatterns;
78 DenseMap<Record*, unsigned> NodeXFormMap;
79 std::vector<const Record*> NodeXForms;
82 MatcherTableEmitter() {}
84 unsigned EmitMatcherList(const MatcherNode *N, unsigned Indent,
85 unsigned StartIdx, formatted_raw_ostream &OS);
87 void EmitPredicateFunctions(formatted_raw_ostream &OS);
89 unsigned EmitMatcher(const MatcherNode *N, unsigned Indent,
90 formatted_raw_ostream &OS);
92 unsigned getNodePredicate(StringRef PredName) {
93 unsigned &Entry = NodePredicateMap[PredName];
95 NodePredicates.push_back(PredName.str());
96 Entry = NodePredicates.size();
100 unsigned getPatternPredicate(StringRef PredName) {
101 unsigned &Entry = PatternPredicateMap[PredName];
103 PatternPredicates.push_back(PredName.str());
104 Entry = PatternPredicates.size();
109 unsigned getComplexPat(const ComplexPattern &P) {
110 unsigned &Entry = ComplexPatternMap[&P];
112 ComplexPatterns.push_back(&P);
113 Entry = ComplexPatterns.size();
118 unsigned getNodeXFormID(Record *Rec) {
119 unsigned &Entry = NodeXFormMap[Rec];
121 NodeXForms.push_back(Rec);
122 Entry = NodeXForms.size();
128 } // end anonymous namespace.
130 /// EmitVBRValue - Emit the specified value as a VBR, returning the number of
132 static unsigned EmitVBRValue(unsigned Val, raw_ostream &OS) {
138 unsigned InVal = Val;
139 unsigned NumBytes = 0;
141 OS << (Val&127) << "|128,";
145 OS << Val << "/*" << InVal << "*/, ";
149 /// EmitMatcherOpcodes - Emit bytes for the specified matcher and return
150 /// the number of bytes emitted.
151 unsigned MatcherTableEmitter::
152 EmitMatcher(const MatcherNode *N, unsigned Indent, formatted_raw_ostream &OS) {
153 OS.PadToColumn(Indent*2);
155 switch (N->getKind()) {
156 case MatcherNode::Push: assert(0 && "Should be handled by caller");
157 case MatcherNode::RecordNode:
158 OS << "OPC_RecordNode,";
159 OS.PadToColumn(CommentIndent) << "// "
160 << cast<RecordMatcherNode>(N)->getWhatFor() << '\n';
163 case MatcherNode::RecordMemRef:
164 OS << "OPC_RecordMemRef,\n";
167 case MatcherNode::CaptureFlagInput:
168 OS << "OPC_CaptureFlagInput,\n";
171 case MatcherNode::MoveChild:
172 OS << "OPC_MoveChild, "
173 << cast<MoveChildMatcherNode>(N)->getChildNo() << ",\n";
176 case MatcherNode::MoveParent:
177 OS << "OPC_MoveParent,\n";
180 case MatcherNode::CheckSame:
181 OS << "OPC_CheckSame, "
182 << cast<CheckSameMatcherNode>(N)->getMatchNumber() << ",\n";
185 case MatcherNode::CheckPatternPredicate: {
186 StringRef Pred = cast<CheckPatternPredicateMatcherNode>(N)->getPredicate();
187 OS << "OPC_CheckPatternPredicate, " << getPatternPredicate(Pred) << ',';
188 OS.PadToColumn(CommentIndent) << "// " << Pred << '\n';
191 case MatcherNode::CheckPredicate: {
192 StringRef Pred = cast<CheckPredicateMatcherNode>(N)->getPredicateName();
193 OS << "OPC_CheckPredicate, " << getNodePredicate(Pred) << ',';
194 OS.PadToColumn(CommentIndent) << "// " << Pred << '\n';
198 case MatcherNode::CheckOpcode:
199 OS << "OPC_CheckOpcode, "
200 << cast<CheckOpcodeMatcherNode>(N)->getOpcodeName() << ",\n";
203 case MatcherNode::CheckMultiOpcode: {
204 const CheckMultiOpcodeMatcherNode *CMO=cast<CheckMultiOpcodeMatcherNode>(N);
205 OS << "OPC_CheckMultiOpcode, " << CMO->getNumOpcodeNames() << ", ";
206 for (unsigned i = 0, e = CMO->getNumOpcodeNames(); i != e; ++i)
207 OS << CMO->getOpcodeName(i) << ", ";
209 return 2 + CMO->getNumOpcodeNames();
212 case MatcherNode::CheckType:
213 OS << "OPC_CheckType, "
214 << getEnumName(cast<CheckTypeMatcherNode>(N)->getType()) << ",\n";
217 case MatcherNode::CheckInteger: {
218 int64_t Val = cast<CheckIntegerMatcherNode>(N)->getValue();
219 OS << "OPC_CheckInteger" << ClassifyInt(Val) << ", ";
220 return EmitInt(Val, OS)+1;
222 case MatcherNode::CheckCondCode:
223 OS << "OPC_CheckCondCode, ISD::"
224 << cast<CheckCondCodeMatcherNode>(N)->getCondCodeName() << ",\n";
227 case MatcherNode::CheckValueType:
228 OS << "OPC_CheckValueType, MVT::"
229 << cast<CheckValueTypeMatcherNode>(N)->getTypeName() << ",\n";
232 case MatcherNode::CheckComplexPat: {
233 const ComplexPattern &Pattern =
234 cast<CheckComplexPatMatcherNode>(N)->getPattern();
235 OS << "OPC_CheckComplexPat, " << getComplexPat(Pattern) << ',';
236 OS.PadToColumn(CommentIndent) << "// " << Pattern.getSelectFunc();
237 OS << ": " << Pattern.getNumOperands() << " operands";
238 if (Pattern.hasProperty(SDNPHasChain))
239 OS << " + chain result and input";
244 case MatcherNode::CheckAndImm: {
245 int64_t Val = cast<CheckAndImmMatcherNode>(N)->getValue();
246 OS << "OPC_CheckAndImm" << ClassifyInt(Val) << ", ";
247 return EmitInt(Val, OS)+1;
250 case MatcherNode::CheckOrImm: {
251 int64_t Val = cast<CheckOrImmMatcherNode>(N)->getValue();
252 OS << "OPC_CheckOrImm" << ClassifyInt(Val) << ", ";
253 return EmitInt(Val, OS)+1;
255 case MatcherNode::CheckFoldableChainNode:
256 OS << "OPC_CheckFoldableChainNode,\n";
258 case MatcherNode::CheckChainCompatible:
259 OS << "OPC_CheckChainCompatible, "
260 << cast<CheckChainCompatibleMatcherNode>(N)->getPreviousOp() << ",\n";
263 case MatcherNode::EmitInteger: {
264 int64_t Val = cast<EmitIntegerMatcherNode>(N)->getValue();
265 OS << "OPC_EmitInteger" << ClassifyInt(Val) << ", "
266 << getEnumName(cast<EmitIntegerMatcherNode>(N)->getVT()) << ", ";
267 return EmitInt(Val, OS)+2;
269 case MatcherNode::EmitStringInteger: {
270 const std::string &Val = cast<EmitStringIntegerMatcherNode>(N)->getValue();
271 // These should always fit into one byte.
272 OS << "OPC_EmitInteger1, "
273 << getEnumName(cast<EmitStringIntegerMatcherNode>(N)->getVT()) << ", "
278 case MatcherNode::EmitRegister:
279 OS << "OPC_EmitRegister, "
280 << getEnumName(cast<EmitRegisterMatcherNode>(N)->getVT()) << ", ";
281 if (Record *R = cast<EmitRegisterMatcherNode>(N)->getReg())
282 OS << getQualifiedName(R) << ",\n";
284 OS << "0 /*zero_reg*/,\n";
287 case MatcherNode::EmitConvertToTarget:
288 OS << "OPC_EmitConvertToTarget, "
289 << cast<EmitConvertToTargetMatcherNode>(N)->getSlot() << ",\n";
292 case MatcherNode::EmitMergeInputChains: {
293 const EmitMergeInputChainsMatcherNode *MN =
294 cast<EmitMergeInputChainsMatcherNode>(N);
295 OS << "OPC_EmitMergeInputChains, " << MN->getNumNodes() << ", ";
296 for (unsigned i = 0, e = MN->getNumNodes(); i != e; ++i)
297 OS << MN->getNode(i) << ", ";
299 return 2+MN->getNumNodes();
301 case MatcherNode::EmitCopyToReg:
302 OS << "OPC_EmitCopyToReg, "
303 << cast<EmitCopyToRegMatcherNode>(N)->getSrcSlot() << ", "
304 << getQualifiedName(cast<EmitCopyToRegMatcherNode>(N)->getDestPhysReg())
307 case MatcherNode::EmitNodeXForm: {
308 const EmitNodeXFormMatcherNode *XF = cast<EmitNodeXFormMatcherNode>(N);
309 OS << "OPC_EmitNodeXForm, " << getNodeXFormID(XF->getNodeXForm()) << ", "
310 << XF->getSlot() << ',';
311 OS.PadToColumn(CommentIndent) << "// "<<XF->getNodeXForm()->getName()<<'\n';
315 case MatcherNode::EmitNode: {
316 const EmitNodeMatcherNode *EN = cast<EmitNodeMatcherNode>(N);
317 OS << "OPC_EmitNode, TARGET_OPCODE(" << EN->getOpcodeName() << "), 0";
319 if (EN->hasChain()) OS << "|OPFL_Chain";
320 if (EN->hasFlag()) OS << "|OPFL_Flag";
321 if (EN->hasMemRefs()) OS << "|OPFL_MemRefs";
322 if (EN->getNumFixedArityOperands() != -1)
323 OS << "|OPFL_Variadic" << EN->getNumFixedArityOperands();
326 OS.PadToColumn(Indent*2+4) << EN->getNumVTs() << "/*#VTs*/, ";
327 for (unsigned i = 0, e = EN->getNumVTs(); i != e; ++i)
328 OS << getEnumName(EN->getVT(i)) << ", ";
330 OS << EN->getNumOperands() << "/*#Ops*/, ";
331 unsigned NumOperandBytes = 0;
332 for (unsigned i = 0, e = EN->getNumOperands(); i != e; ++i) {
333 // We emit the operand numbers in VBR encoded format, in case the number
334 // is too large to represent with a byte.
335 NumOperandBytes += EmitVBRValue(EN->getOperand(i), OS);
338 return 6+EN->getNumVTs()+NumOperandBytes;
340 case MatcherNode::CompleteMatch: {
341 const CompleteMatchMatcherNode *CM = cast<CompleteMatchMatcherNode>(N);
342 OS << "OPC_CompleteMatch, " << CM->getNumResults() << ", ";
343 unsigned NumResultBytes = 0;
344 for (unsigned i = 0, e = CM->getNumResults(); i != e; ++i)
345 NumResultBytes += EmitVBRValue(CM->getResult(i), OS);
347 OS.PadToColumn(Indent*2) << "// Src: "
348 << *CM->getPattern().getSrcPattern() << '\n';
349 OS.PadToColumn(Indent*2) << "// Dst: "
350 << *CM->getPattern().getDstPattern() << '\n';
351 return 2 + NumResultBytes;
354 assert(0 && "Unreachable");
358 /// EmitMatcherList - Emit the bytes for the specified matcher subtree.
359 unsigned MatcherTableEmitter::
360 EmitMatcherList(const MatcherNode *N, unsigned Indent, unsigned CurrentIdx,
361 formatted_raw_ostream &OS) {
364 // Push is a special case since it is binary.
365 if (const PushMatcherNode *PMN = dyn_cast<PushMatcherNode>(N)) {
366 // We need to encode the child and the offset of the failure code before
367 // emitting either of them. Handle this by buffering the output into a
368 // string while we get the size.
369 SmallString<128> TmpBuf;
372 raw_svector_ostream OS(TmpBuf);
373 formatted_raw_ostream FOS(OS);
374 NextSize = EmitMatcherList(cast<PushMatcherNode>(N)->getNext(),
375 Indent+1, CurrentIdx+2, FOS);
378 // In the unlikely event that we have something too big to emit with a
379 // one byte offset, regenerate it with a two-byte one.
380 if (NextSize > 255) {
382 raw_svector_ostream OS(TmpBuf);
383 formatted_raw_ostream FOS(OS);
384 NextSize = EmitMatcherList(cast<PushMatcherNode>(N)->getNext(),
385 Indent+1, CurrentIdx+3, FOS);
386 if (NextSize > 65535) {
388 "Tblgen internal error: can't handle pattern this complex yet\n";
393 OS << "/*" << CurrentIdx << "*/";
394 OS.PadToColumn(Indent*2);
397 OS << "OPC_Push, " << NextSize << ",\n";
399 OS << "OPC_Push2, " << (NextSize&255) << ", " << (NextSize>>8) << ",\n";
403 CurrentIdx += 2+NextSize;
404 N = PMN->getFailure();
408 OS << "/*" << CurrentIdx << "*/";
409 unsigned MatcherSize = EmitMatcher(N, Indent, OS);
411 CurrentIdx += MatcherSize;
413 // If there are other nodes in this list, iterate to them, otherwise we're
420 void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
421 // FIXME: Don't build off the DAGISelEmitter's predicates, emit them directly
422 // here into the case stmts.
424 // Emit pattern predicates.
425 OS << "bool CheckPatternPredicate(unsigned PredNo) const {\n";
426 OS << " switch (PredNo) {\n";
427 OS << " default: assert(0 && \"Invalid predicate in table?\");\n";
428 for (unsigned i = 0, e = PatternPredicates.size(); i != e; ++i)
429 OS << " case " << i << ": return " << PatternPredicates[i] << ";\n";
433 // Emit Node predicates.
434 OS << "bool CheckNodePredicate(SDNode *N, unsigned PredNo) const {\n";
435 OS << " switch (PredNo) {\n";
436 OS << " default: assert(0 && \"Invalid predicate in table?\");\n";
437 for (unsigned i = 0, e = NodePredicates.size(); i != e; ++i)
438 OS << " case " << i << ": return " << NodePredicates[i] << "(N);\n";
442 // Emit CompletePattern matchers.
443 // FIXME: This should be const.
444 OS << "bool CheckComplexPattern(SDNode *Root, SDValue N,\n";
445 OS << " unsigned PatternNo, SmallVectorImpl<SDValue> &Result) {\n";
446 OS << " switch (PatternNo) {\n";
447 OS << " default: assert(0 && \"Invalid pattern # in table?\");\n";
448 for (unsigned i = 0, e = ComplexPatterns.size(); i != e; ++i) {
449 const ComplexPattern &P = *ComplexPatterns[i];
450 unsigned NumOps = P.getNumOperands();
452 if (P.hasProperty(SDNPHasChain))
453 ++NumOps; // Get the chained node too.
455 OS << " case " << i << ":\n";
456 OS << " Result.resize(Result.size()+" << NumOps << ");\n";
457 OS << " return " << P.getSelectFunc();
459 // FIXME: Temporary hack until old isel dies.
460 if (P.hasProperty(SDNPHasChain))
464 for (unsigned i = 0; i != NumOps; ++i)
465 OS << ", Result[Result.size()-" << (NumOps-i) << ']';
471 // Emit SDNodeXForm handlers.
472 // FIXME: This should be const.
473 OS << "SDValue RunSDNodeXForm(SDValue V, unsigned XFormNo) {\n";
474 OS << " switch (XFormNo) {\n";
475 OS << " default: assert(0 && \"Invalid xform # in table?\");\n";
477 // FIXME: The node xform could take SDValue's instead of SDNode*'s.
478 for (unsigned i = 0, e = NodeXForms.size(); i != e; ++i)
479 OS << " case " << i << ": return Transform_" << NodeXForms[i]->getName()
480 << "(V.getNode());\n";
486 void llvm::EmitMatcherTable(const MatcherNode *Matcher, raw_ostream &O) {
487 formatted_raw_ostream OS(O);
489 OS << "// The main instruction selector code.\n";
490 OS << "SDNode *SelectCode2(SDNode *N) {\n";
492 MatcherTableEmitter MatcherEmitter;
494 OS << " // Opcodes are emitted as 2 bytes, TARGET_OPCODE handles this.\n";
495 OS << " #define TARGET_OPCODE(X) X & 255, unsigned(X) >> 8\n";
496 OS << " static const unsigned char MatcherTable[] = {\n";
497 unsigned TotalSize = MatcherEmitter.EmitMatcherList(Matcher, 5, 0, OS);
498 OS << " 0\n }; // Total Array size is " << (TotalSize+1) << " bytes\n\n";
499 OS << " #undef TARGET_OPCODE\n";
500 OS << " return SelectCodeCommon(N, MatcherTable,sizeof(MatcherTable));\n}\n";
503 // Next up, emit the function for node and pattern predicates:
504 MatcherEmitter.EmitPredicateFunctions(OS);