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llvm-project/llvm/utils/TableGen/DAGISelMatcherEmitter.cpp

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//===- DAGISelMatcherEmitter.cpp - Matcher Emitter ------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains code to generate C++ code a matcher.
//
//===----------------------------------------------------------------------===//
#include "DAGISelMatcher.h"
#include "CodeGenDAGPatterns.h"
#include "Record.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
enum {
CommentIndent = 30
};
/// ClassifyInt - Classify an integer by size, return '1','2','4','8' if this
/// fits in 1, 2, 4, or 8 sign extended bytes.
static char ClassifyInt(int64_t Val) {
if (Val == int8_t(Val)) return '1';
if (Val == int16_t(Val)) return '2';
if (Val == int32_t(Val)) return '4';
return '8';
}
/// EmitInt - Emit the specified integer, returning the number of bytes emitted.
static unsigned EmitInt(int64_t Val, formatted_raw_ostream &OS) {
unsigned BytesEmitted = 1;
OS << (int)(unsigned char)Val << ", ";
if (Val == int8_t(Val)) {
OS << '\n';
return BytesEmitted;
}
OS << (int)(unsigned char)(Val >> 8) << ", ";
++BytesEmitted;
if (Val != int16_t(Val)) {
OS << (int)(unsigned char)(Val >> 16) << ", "
<< (int)(unsigned char)(Val >> 24) << ", ";
BytesEmitted += 2;
if (Val != int32_t(Val)) {
OS << (int)(unsigned char)(Val >> 32) << ", "
<< (int)(unsigned char)(Val >> 40) << ", "
<< (int)(unsigned char)(Val >> 48) << ", "
<< (int)(unsigned char)(Val >> 56) << ", ";
BytesEmitted += 4;
}
}
OS.PadToColumn(CommentIndent) << "// " << Val << " aka 0x";
OS.write_hex(Val) << '\n';
return BytesEmitted;
}
namespace {
class MatcherTableEmitter {
StringMap<unsigned> NodePredicateMap, PatternPredicateMap;
std::vector<std::string> NodePredicates, PatternPredicates;
DenseMap<const ComplexPattern*, unsigned> ComplexPatternMap;
std::vector<const ComplexPattern*> ComplexPatterns;
DenseMap<Record*, unsigned> NodeXFormMap;
std::vector<const Record*> NodeXForms;
// Per opcode frequence count.
std::vector<unsigned> Histogram;
public:
MatcherTableEmitter() {}
unsigned EmitMatcherList(const MatcherNode *N, unsigned Indent,
unsigned StartIdx, formatted_raw_ostream &OS);
void EmitPredicateFunctions(formatted_raw_ostream &OS);
void EmitHistogram(formatted_raw_ostream &OS);
private:
unsigned EmitMatcher(const MatcherNode *N, unsigned Indent,
formatted_raw_ostream &OS);
unsigned getNodePredicate(StringRef PredName) {
unsigned &Entry = NodePredicateMap[PredName];
if (Entry == 0) {
NodePredicates.push_back(PredName.str());
Entry = NodePredicates.size();
}
return Entry-1;
}
unsigned getPatternPredicate(StringRef PredName) {
unsigned &Entry = PatternPredicateMap[PredName];
if (Entry == 0) {
PatternPredicates.push_back(PredName.str());
Entry = PatternPredicates.size();
}
return Entry-1;
}
unsigned getComplexPat(const ComplexPattern &P) {
unsigned &Entry = ComplexPatternMap[&P];
if (Entry == 0) {
ComplexPatterns.push_back(&P);
Entry = ComplexPatterns.size();
}
return Entry-1;
}
unsigned getNodeXFormID(Record *Rec) {
unsigned &Entry = NodeXFormMap[Rec];
if (Entry == 0) {
NodeXForms.push_back(Rec);
Entry = NodeXForms.size();
}
return Entry-1;
}
};
} // end anonymous namespace.
/// EmitVBRValue - Emit the specified value as a VBR, returning the number of
/// bytes emitted.
static unsigned EmitVBRValue(unsigned Val, raw_ostream &OS) {
if (Val <= 127) {
OS << Val << ", ";
return 1;
}
unsigned InVal = Val;
unsigned NumBytes = 0;
while (Val >= 128) {
OS << (Val&127) << "|128,";
Val >>= 7;
++NumBytes;
}
OS << Val << "/*" << InVal << "*/, ";
return NumBytes+1;
}
/// EmitMatcherOpcodes - Emit bytes for the specified matcher and return
/// the number of bytes emitted.
unsigned MatcherTableEmitter::
EmitMatcher(const MatcherNode *N, unsigned Indent, formatted_raw_ostream &OS) {
OS.PadToColumn(Indent*2);
switch (N->getKind()) {
case MatcherNode::Push: assert(0 && "Should be handled by caller");
case MatcherNode::RecordNode:
OS << "OPC_RecordNode,";
OS.PadToColumn(CommentIndent) << "// "
<< cast<RecordMatcherNode>(N)->getWhatFor() << '\n';
return 1;
case MatcherNode::RecordChild:
OS << "OPC_RecordChild" << cast<RecordChildMatcherNode>(N)->getChildNo()
<< ',';
OS.PadToColumn(CommentIndent) << "// "
<< cast<RecordChildMatcherNode>(N)->getWhatFor() << '\n';
return 1;
case MatcherNode::RecordMemRef:
OS << "OPC_RecordMemRef,\n";
return 1;
case MatcherNode::CaptureFlagInput:
OS << "OPC_CaptureFlagInput,\n";
return 1;
case MatcherNode::MoveChild:
OS << "OPC_MoveChild, "
<< cast<MoveChildMatcherNode>(N)->getChildNo() << ",\n";
return 2;
case MatcherNode::MoveParent:
OS << "OPC_MoveParent,\n";
return 1;
case MatcherNode::CheckSame:
OS << "OPC_CheckSame, "
<< cast<CheckSameMatcherNode>(N)->getMatchNumber() << ",\n";
return 2;
case MatcherNode::CheckPatternPredicate: {
StringRef Pred = cast<CheckPatternPredicateMatcherNode>(N)->getPredicate();
OS << "OPC_CheckPatternPredicate, " << getPatternPredicate(Pred) << ',';
OS.PadToColumn(CommentIndent) << "// " << Pred << '\n';
return 2;
}
case MatcherNode::CheckPredicate: {
StringRef Pred = cast<CheckPredicateMatcherNode>(N)->getPredicateName();
OS << "OPC_CheckPredicate, " << getNodePredicate(Pred) << ',';
OS.PadToColumn(CommentIndent) << "// " << Pred << '\n';
return 2;
}
case MatcherNode::CheckOpcode:
OS << "OPC_CheckOpcode, "
<< cast<CheckOpcodeMatcherNode>(N)->getOpcodeName() << ",\n";
return 2;
case MatcherNode::CheckMultiOpcode: {
const CheckMultiOpcodeMatcherNode *CMO=cast<CheckMultiOpcodeMatcherNode>(N);
OS << "OPC_CheckMultiOpcode, " << CMO->getNumOpcodeNames() << ", ";
for (unsigned i = 0, e = CMO->getNumOpcodeNames(); i != e; ++i)
OS << CMO->getOpcodeName(i) << ", ";
OS << '\n';
return 2 + CMO->getNumOpcodeNames();
}
case MatcherNode::CheckType:
OS << "OPC_CheckType, "
<< getEnumName(cast<CheckTypeMatcherNode>(N)->getType()) << ",\n";
return 2;
case MatcherNode::CheckInteger: {
int64_t Val = cast<CheckIntegerMatcherNode>(N)->getValue();
OS << "OPC_CheckInteger" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case MatcherNode::CheckCondCode:
OS << "OPC_CheckCondCode, ISD::"
<< cast<CheckCondCodeMatcherNode>(N)->getCondCodeName() << ",\n";
return 2;
case MatcherNode::CheckValueType:
OS << "OPC_CheckValueType, MVT::"
<< cast<CheckValueTypeMatcherNode>(N)->getTypeName() << ",\n";
return 2;
case MatcherNode::CheckComplexPat: {
const ComplexPattern &Pattern =
cast<CheckComplexPatMatcherNode>(N)->getPattern();
OS << "OPC_CheckComplexPat, " << getComplexPat(Pattern) << ',';
OS.PadToColumn(CommentIndent) << "// " << Pattern.getSelectFunc();
OS << ": " << Pattern.getNumOperands() << " operands";
if (Pattern.hasProperty(SDNPHasChain))
OS << " + chain result and input";
OS << '\n';
return 2;
}
case MatcherNode::CheckAndImm: {
int64_t Val = cast<CheckAndImmMatcherNode>(N)->getValue();
OS << "OPC_CheckAndImm" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case MatcherNode::CheckOrImm: {
int64_t Val = cast<CheckOrImmMatcherNode>(N)->getValue();
OS << "OPC_CheckOrImm" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case MatcherNode::CheckFoldableChainNode:
OS << "OPC_CheckFoldableChainNode,\n";
return 1;
case MatcherNode::CheckChainCompatible:
OS << "OPC_CheckChainCompatible, "
<< cast<CheckChainCompatibleMatcherNode>(N)->getPreviousOp() << ",\n";
return 2;
case MatcherNode::EmitInteger: {
int64_t Val = cast<EmitIntegerMatcherNode>(N)->getValue();
OS << "OPC_EmitInteger" << ClassifyInt(Val) << ", "
<< getEnumName(cast<EmitIntegerMatcherNode>(N)->getVT()) << ", ";
return EmitInt(Val, OS)+2;
}
case MatcherNode::EmitStringInteger: {
const std::string &Val = cast<EmitStringIntegerMatcherNode>(N)->getValue();
// These should always fit into one byte.
OS << "OPC_EmitInteger1, "
<< getEnumName(cast<EmitStringIntegerMatcherNode>(N)->getVT()) << ", "
<< Val << ",\n";
return 3;
}
case MatcherNode::EmitRegister:
OS << "OPC_EmitRegister, "
<< getEnumName(cast<EmitRegisterMatcherNode>(N)->getVT()) << ", ";
if (Record *R = cast<EmitRegisterMatcherNode>(N)->getReg())
OS << getQualifiedName(R) << ",\n";
else
OS << "0 /*zero_reg*/,\n";
return 3;
case MatcherNode::EmitConvertToTarget:
OS << "OPC_EmitConvertToTarget, "
<< cast<EmitConvertToTargetMatcherNode>(N)->getSlot() << ",\n";
return 2;
case MatcherNode::EmitMergeInputChains: {
const EmitMergeInputChainsMatcherNode *MN =
cast<EmitMergeInputChainsMatcherNode>(N);
OS << "OPC_EmitMergeInputChains, " << MN->getNumNodes() << ", ";
for (unsigned i = 0, e = MN->getNumNodes(); i != e; ++i)
OS << MN->getNode(i) << ", ";
OS << '\n';
return 2+MN->getNumNodes();
}
case MatcherNode::EmitCopyToReg:
OS << "OPC_EmitCopyToReg, "
<< cast<EmitCopyToRegMatcherNode>(N)->getSrcSlot() << ", "
<< getQualifiedName(cast<EmitCopyToRegMatcherNode>(N)->getDestPhysReg())
<< ",\n";
return 3;
case MatcherNode::EmitNodeXForm: {
const EmitNodeXFormMatcherNode *XF = cast<EmitNodeXFormMatcherNode>(N);
OS << "OPC_EmitNodeXForm, " << getNodeXFormID(XF->getNodeXForm()) << ", "
<< XF->getSlot() << ',';
OS.PadToColumn(CommentIndent) << "// "<<XF->getNodeXForm()->getName()<<'\n';
return 3;
}
case MatcherNode::EmitNode: {
const EmitNodeMatcherNode *EN = cast<EmitNodeMatcherNode>(N);
OS << "OPC_EmitNode, TARGET_OPCODE(" << EN->getOpcodeName() << "), 0";
if (EN->hasChain()) OS << "|OPFL_Chain";
if (EN->hasFlag()) OS << "|OPFL_Flag";
if (EN->hasMemRefs()) OS << "|OPFL_MemRefs";
if (EN->getNumFixedArityOperands() != -1)
OS << "|OPFL_Variadic" << EN->getNumFixedArityOperands();
OS << ",\n";
OS.PadToColumn(Indent*2+4) << EN->getNumVTs() << "/*#VTs*/, ";
for (unsigned i = 0, e = EN->getNumVTs(); i != e; ++i)
OS << getEnumName(EN->getVT(i)) << ", ";
OS << EN->getNumOperands() << "/*#Ops*/, ";
unsigned NumOperandBytes = 0;
for (unsigned i = 0, e = EN->getNumOperands(); i != e; ++i) {
// We emit the operand numbers in VBR encoded format, in case the number
// is too large to represent with a byte.
NumOperandBytes += EmitVBRValue(EN->getOperand(i), OS);
}
OS << '\n';
return 6+EN->getNumVTs()+NumOperandBytes;
}
case MatcherNode::MarkFlagResults: {
const MarkFlagResultsMatcherNode *CFR = cast<MarkFlagResultsMatcherNode>(N);
OS << "OPC_MarkFlagResults, " << CFR->getNumNodes() << ", ";
unsigned NumOperandBytes = 0;
for (unsigned i = 0, e = CFR->getNumNodes(); i != e; ++i)
NumOperandBytes += EmitVBRValue(CFR->getNode(i), OS);
OS << '\n';
return 2+NumOperandBytes;
}
case MatcherNode::CompleteMatch: {
const CompleteMatchMatcherNode *CM = cast<CompleteMatchMatcherNode>(N);
OS << "OPC_CompleteMatch, " << CM->getNumResults() << ", ";
unsigned NumResultBytes = 0;
for (unsigned i = 0, e = CM->getNumResults(); i != e; ++i)
NumResultBytes += EmitVBRValue(CM->getResult(i), OS);
OS << '\n';
OS.PadToColumn(Indent*2) << "// Src: "
<< *CM->getPattern().getSrcPattern() << '\n';
OS.PadToColumn(Indent*2) << "// Dst: "
<< *CM->getPattern().getDstPattern() << '\n';
return 2 + NumResultBytes;
}
}
assert(0 && "Unreachable");
return 0;
}
/// EmitMatcherList - Emit the bytes for the specified matcher subtree.
unsigned MatcherTableEmitter::
EmitMatcherList(const MatcherNode *N, unsigned Indent, unsigned CurrentIdx,
formatted_raw_ostream &OS) {
unsigned Size = 0;
while (N) {
if (unsigned(N->getKind()) >= Histogram.size())
Histogram.resize(N->getKind()+1);
Histogram[N->getKind()]++;
// Push is a special case since it is binary.
if (const PushMatcherNode *PMN = dyn_cast<PushMatcherNode>(N)) {
// We need to encode the child and the offset of the failure code before
// emitting either of them. Handle this by buffering the output into a
// string while we get the size.
SmallString<128> TmpBuf;
unsigned NextSize;
{
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
NextSize = EmitMatcherList(cast<PushMatcherNode>(N)->getNext(),
Indent+1, CurrentIdx+2, FOS);
}
// In the unlikely event that we have something too big to emit with a
// one byte offset, regenerate it with a two-byte one.
if (NextSize > 255) {
TmpBuf.clear();
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
NextSize = EmitMatcherList(cast<PushMatcherNode>(N)->getNext(),
Indent+1, CurrentIdx+3, FOS);
if (NextSize > 65535) {
errs() <<
"Tblgen internal error: can't handle pattern this complex yet\n";
exit(1);
}
}
OS << "/*" << CurrentIdx << "*/";
OS.PadToColumn(Indent*2);
if (NextSize < 256)
OS << "OPC_Push, " << NextSize << ",\n";
else
OS << "OPC_Push2, " << (NextSize&255) << ", " << (NextSize>>8) << ",\n";
OS << TmpBuf.str();
Size += 2+NextSize;
CurrentIdx += 2+NextSize;
N = PMN->getFailure();
continue;
}
OS << "/*" << CurrentIdx << "*/";
unsigned MatcherSize = EmitMatcher(N, Indent, OS);
Size += MatcherSize;
CurrentIdx += MatcherSize;
// If there are other nodes in this list, iterate to them, otherwise we're
// done.
N = N->getNext();
}
return Size;
}
void MatcherTableEmitter::EmitPredicateFunctions(formatted_raw_ostream &OS) {
// FIXME: Don't build off the DAGISelEmitter's predicates, emit them directly
// here into the case stmts.
// Emit pattern predicates.
OS << "bool CheckPatternPredicate(unsigned PredNo) const {\n";
OS << " switch (PredNo) {\n";
OS << " default: assert(0 && \"Invalid predicate in table?\");\n";
for (unsigned i = 0, e = PatternPredicates.size(); i != e; ++i)
OS << " case " << i << ": return " << PatternPredicates[i] << ";\n";
OS << " }\n";
OS << "}\n\n";
// Emit Node predicates.
OS << "bool CheckNodePredicate(SDNode *N, unsigned PredNo) const {\n";
OS << " switch (PredNo) {\n";
OS << " default: assert(0 && \"Invalid predicate in table?\");\n";
for (unsigned i = 0, e = NodePredicates.size(); i != e; ++i)
OS << " case " << i << ": return " << NodePredicates[i] << "(N);\n";
OS << " }\n";
OS << "}\n\n";
// Emit CompletePattern matchers.
// FIXME: This should be const.
OS << "bool CheckComplexPattern(SDNode *Root, SDValue N,\n";
OS << " unsigned PatternNo, SmallVectorImpl<SDValue> &Result) {\n";
OS << " switch (PatternNo) {\n";
OS << " default: assert(0 && \"Invalid pattern # in table?\");\n";
for (unsigned i = 0, e = ComplexPatterns.size(); i != e; ++i) {
const ComplexPattern &P = *ComplexPatterns[i];
unsigned NumOps = P.getNumOperands();
if (P.hasProperty(SDNPHasChain))
++NumOps; // Get the chained node too.
OS << " case " << i << ":\n";
OS << " Result.resize(Result.size()+" << NumOps << ");\n";
OS << " return " << P.getSelectFunc();
// FIXME: Temporary hack until old isel dies.
if (P.hasProperty(SDNPHasChain))
OS << "XXX";
OS << "(Root, N";
for (unsigned i = 0; i != NumOps; ++i)
OS << ", Result[Result.size()-" << (NumOps-i) << ']';
OS << ");\n";
}
OS << " }\n";
OS << "}\n\n";
// Emit SDNodeXForm handlers.
// FIXME: This should be const.
OS << "SDValue RunSDNodeXForm(SDValue V, unsigned XFormNo) {\n";
OS << " switch (XFormNo) {\n";
OS << " default: assert(0 && \"Invalid xform # in table?\");\n";
// FIXME: The node xform could take SDValue's instead of SDNode*'s.
for (unsigned i = 0, e = NodeXForms.size(); i != e; ++i)
OS << " case " << i << ": return Transform_" << NodeXForms[i]->getName()
<< "(V.getNode());\n";
OS << " }\n";
OS << "}\n\n";
}
void MatcherTableEmitter::EmitHistogram(formatted_raw_ostream &OS) {
OS << " // Opcode Histogram:\n";
for (unsigned i = 0, e = Histogram.size(); i != e; ++i) {
OS << " // #";
switch ((MatcherNode::KindTy)i) {
case MatcherNode::Push: OS << "OPC_Push"; break;
case MatcherNode::RecordNode: OS << "OPC_RecordNode"; break;
case MatcherNode::RecordChild: OS << "OPC_RecordChild"; break;
case MatcherNode::RecordMemRef: OS << "OPC_RecordMemRef"; break;
case MatcherNode::CaptureFlagInput: OS << "OPC_CaptureFlagInput"; break;
case MatcherNode::MoveChild: OS << "OPC_MoveChild"; break;
case MatcherNode::MoveParent: OS << "OPC_MoveParent"; break;
case MatcherNode::CheckSame: OS << "OPC_CheckSame"; break;
case MatcherNode::CheckPatternPredicate:
OS << "OPC_CheckPatternPredicate"; break;
case MatcherNode::CheckPredicate: OS << "OPC_CheckPredicate"; break;
case MatcherNode::CheckOpcode: OS << "OPC_CheckOpcode"; break;
case MatcherNode::CheckMultiOpcode: OS << "OPC_CheckMultiOpcode"; break;
case MatcherNode::CheckType: OS << "OPC_CheckType"; break;
case MatcherNode::CheckInteger: OS << "OPC_CheckInteger"; break;
case MatcherNode::CheckCondCode: OS << "OPC_CheckCondCode"; break;
case MatcherNode::CheckValueType: OS << "OPC_CheckValueType"; break;
case MatcherNode::CheckComplexPat: OS << "OPC_CheckComplexPat"; break;
case MatcherNode::CheckAndImm: OS << "OPC_CheckAndImm"; break;
case MatcherNode::CheckOrImm: OS << "OPC_CheckOrImm"; break;
case MatcherNode::CheckFoldableChainNode:
OS << "OPC_CheckFoldableChainNode"; break;
case MatcherNode::CheckChainCompatible:
OS << "OPC_CheckChainCompatible"; break;
case MatcherNode::EmitInteger: OS << "OPC_EmitInteger"; break;
case MatcherNode::EmitStringInteger: OS << "OPC_EmitStringInteger"; break;
case MatcherNode::EmitRegister: OS << "OPC_EmitRegister"; break;
case MatcherNode::EmitConvertToTarget:
OS << "OPC_EmitConvertToTarget"; break;
case MatcherNode::EmitMergeInputChains:
OS << "OPC_EmitMergeInputChains"; break;
case MatcherNode::EmitCopyToReg: OS << "OPC_EmitCopyToReg"; break;
case MatcherNode::EmitNode: OS << "OPC_EmitNode"; break;
case MatcherNode::EmitNodeXForm: OS << "OPC_EmitNodeXForm"; break;
case MatcherNode::MarkFlagResults: OS << "OPC_MarkFlagResults"; break;
case MatcherNode::CompleteMatch: OS << "OPC_CompleteMatch"; break;
}
OS.PadToColumn(40) << " = " << Histogram[i] << '\n';
}
OS << '\n';
}
void llvm::EmitMatcherTable(const MatcherNode *Matcher, raw_ostream &O) {
formatted_raw_ostream OS(O);
OS << "// The main instruction selector code.\n";
OS << "SDNode *SelectCode(SDNode *N) {\n";
MatcherTableEmitter MatcherEmitter;
OS << " // Opcodes are emitted as 2 bytes, TARGET_OPCODE handles this.\n";
OS << " #define TARGET_OPCODE(X) X & 255, unsigned(X) >> 8\n";
OS << " static const unsigned char MatcherTable[] = {\n";
unsigned TotalSize = MatcherEmitter.EmitMatcherList(Matcher, 5, 0, OS);
OS << " 0\n }; // Total Array size is " << (TotalSize+1) << " bytes\n\n";
MatcherEmitter.EmitHistogram(OS);
OS << " #undef TARGET_OPCODE\n";
OS << " return SelectCodeCommon(N, MatcherTable,sizeof(MatcherTable));\n}\n";
OS << "\n";
// Next up, emit the function for node and pattern predicates:
MatcherEmitter.EmitPredicateFunctions(OS);
}
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