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llvm-6502/utils/TableGen/DAGISelMatcherEmitter.cpp
Chris Lattner c78f2a3994 enhance the new isel to use SelectNodeTo for most patterns, 
even some the old isel didn't.  There are several parts of
this that make me feel dirty, but it's no worse than the
old isel.  I'll clean up the parts I can do without ripping
out the old one next.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97415 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-28 20:49:53 +00:00

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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 Matcher *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 Matcher *N, unsigned Indent, unsigned CurrentIdx,
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.
static unsigned GetVBRSize(unsigned Val) {
if (Val <= 127) return 1;
unsigned NumBytes = 0;
while (Val >= 128) {
Val >>= 7;
++NumBytes;
}
return NumBytes+1;
}
/// 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 Matcher *N, unsigned Indent, unsigned CurrentIdx,
formatted_raw_ostream &OS) {
OS.PadToColumn(Indent*2);
switch (N->getKind()) {
case Matcher::Scope: {
const ScopeMatcher *SM = cast<ScopeMatcher>(N);
assert(SM->getNext() == 0 && "Shouldn't have next after scope");
unsigned StartIdx = CurrentIdx;
// Emit all of the children.
for (unsigned i = 0, e = SM->getNumChildren(); i != e; ++i) {
if (i == 0) {
OS << "OPC_Scope, ";
++CurrentIdx;
} else {
OS << "/*" << CurrentIdx << "*/";
OS.PadToColumn(Indent*2) << "/*Scope*/ ";
}
// 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. Unfortunately, the offset of the
// children depends on the VBR size of the child, so for large children we
// have to iterate a bit.
SmallString<128> TmpBuf;
unsigned ChildSize = 0;
unsigned VBRSize = 0;
do {
VBRSize = GetVBRSize(ChildSize);
TmpBuf.clear();
raw_svector_ostream OS(TmpBuf);
formatted_raw_ostream FOS(OS);
ChildSize = EmitMatcherList(cast<ScopeMatcher>(N)->getChild(i),
Indent+1, CurrentIdx+VBRSize, FOS);
} while (GetVBRSize(ChildSize) != VBRSize);
assert(ChildSize != 0 && "Should not have a zero-sized child!");
CurrentIdx += EmitVBRValue(ChildSize, OS);
OS << "/*->" << CurrentIdx+ChildSize << "*/";
if (i == 0)
OS.PadToColumn(CommentIndent) << "// " << SM->getNumChildren()
<< " children in Scope";
OS << '\n' << TmpBuf.str();
CurrentIdx += ChildSize;
}
// Emit a zero as a sentinel indicating end of 'Scope'.
OS << "/*" << CurrentIdx << "*/";
OS.PadToColumn(Indent*2) << "0, /*End of Scope*/\n";
return CurrentIdx - StartIdx + 1;
}
case Matcher::RecordNode:
OS << "OPC_RecordNode,";
OS.PadToColumn(CommentIndent) << "// "
<< cast<RecordMatcher>(N)->getWhatFor() << '\n';
return 1;
case Matcher::RecordChild:
OS << "OPC_RecordChild" << cast<RecordChildMatcher>(N)->getChildNo()
<< ',';
OS.PadToColumn(CommentIndent) << "// "
<< cast<RecordChildMatcher>(N)->getWhatFor() << '\n';
return 1;
case Matcher::RecordMemRef:
OS << "OPC_RecordMemRef,\n";
return 1;
case Matcher::CaptureFlagInput:
OS << "OPC_CaptureFlagInput,\n";
return 1;
case Matcher::MoveChild:
OS << "OPC_MoveChild, " << cast<MoveChildMatcher>(N)->getChildNo() << ",\n";
return 2;
case Matcher::MoveParent:
OS << "OPC_MoveParent,\n";
return 1;
case Matcher::CheckSame:
OS << "OPC_CheckSame, "
<< cast<CheckSameMatcher>(N)->getMatchNumber() << ",\n";
return 2;
case Matcher::CheckPatternPredicate: {
StringRef Pred = cast<CheckPatternPredicateMatcher>(N)->getPredicate();
OS << "OPC_CheckPatternPredicate, " << getPatternPredicate(Pred) << ',';
OS.PadToColumn(CommentIndent) << "// " << Pred << '\n';
return 2;
}
case Matcher::CheckPredicate: {
StringRef Pred = cast<CheckPredicateMatcher>(N)->getPredicateName();
OS << "OPC_CheckPredicate, " << getNodePredicate(Pred) << ',';
OS.PadToColumn(CommentIndent) << "// " << Pred << '\n';
return 2;
}
case Matcher::CheckOpcode:
OS << "OPC_CheckOpcode, "
<< cast<CheckOpcodeMatcher>(N)->getOpcode().getEnumName() << ",\n";
return 2;
case Matcher::CheckMultiOpcode: {
const CheckMultiOpcodeMatcher *CMO = cast<CheckMultiOpcodeMatcher>(N);
OS << "OPC_CheckMultiOpcode, " << CMO->getNumOpcodes() << ", ";
for (unsigned i = 0, e = CMO->getNumOpcodes(); i != e; ++i)
OS << CMO->getOpcode(i).getEnumName() << ", ";
OS << '\n';
return 2 + CMO->getNumOpcodes();
}
case Matcher::CheckType:
OS << "OPC_CheckType, "
<< getEnumName(cast<CheckTypeMatcher>(N)->getType()) << ",\n";
return 2;
case Matcher::CheckChildType:
OS << "OPC_CheckChild"
<< cast<CheckChildTypeMatcher>(N)->getChildNo() << "Type, "
<< getEnumName(cast<CheckChildTypeMatcher>(N)->getType()) << ",\n";
return 2;
case Matcher::CheckInteger: {
int64_t Val = cast<CheckIntegerMatcher>(N)->getValue();
OS << "OPC_CheckInteger" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case Matcher::CheckCondCode:
OS << "OPC_CheckCondCode, ISD::"
<< cast<CheckCondCodeMatcher>(N)->getCondCodeName() << ",\n";
return 2;
case Matcher::CheckValueType:
OS << "OPC_CheckValueType, MVT::"
<< cast<CheckValueTypeMatcher>(N)->getTypeName() << ",\n";
return 2;
case Matcher::CheckComplexPat: {
const ComplexPattern &Pattern =
cast<CheckComplexPatMatcher>(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 Matcher::CheckAndImm: {
int64_t Val = cast<CheckAndImmMatcher>(N)->getValue();
OS << "OPC_CheckAndImm" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case Matcher::CheckOrImm: {
int64_t Val = cast<CheckOrImmMatcher>(N)->getValue();
OS << "OPC_CheckOrImm" << ClassifyInt(Val) << ", ";
return EmitInt(Val, OS)+1;
}
case Matcher::CheckFoldableChainNode:
OS << "OPC_CheckFoldableChainNode,\n";
return 1;
case Matcher::CheckChainCompatible:
OS << "OPC_CheckChainCompatible, "
<< cast<CheckChainCompatibleMatcher>(N)->getPreviousOp() << ",\n";
return 2;
case Matcher::EmitInteger: {
int64_t Val = cast<EmitIntegerMatcher>(N)->getValue();
OS << "OPC_EmitInteger" << ClassifyInt(Val) << ", "
<< getEnumName(cast<EmitIntegerMatcher>(N)->getVT()) << ", ";
return EmitInt(Val, OS)+2;
}
case Matcher::EmitStringInteger: {
const std::string &Val = cast<EmitStringIntegerMatcher>(N)->getValue();
// These should always fit into one byte.
OS << "OPC_EmitInteger1, "
<< getEnumName(cast<EmitStringIntegerMatcher>(N)->getVT()) << ", "
<< Val << ",\n";
return 3;
}
case Matcher::EmitRegister:
OS << "OPC_EmitRegister, "
<< getEnumName(cast<EmitRegisterMatcher>(N)->getVT()) << ", ";
if (Record *R = cast<EmitRegisterMatcher>(N)->getReg())
OS << getQualifiedName(R) << ",\n";
else
OS << "0 /*zero_reg*/,\n";
return 3;
case Matcher::EmitConvertToTarget:
OS << "OPC_EmitConvertToTarget, "
<< cast<EmitConvertToTargetMatcher>(N)->getSlot() << ",\n";
return 2;
case Matcher::EmitMergeInputChains: {
const EmitMergeInputChainsMatcher *MN =
cast<EmitMergeInputChainsMatcher>(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 Matcher::EmitCopyToReg:
OS << "OPC_EmitCopyToReg, "
<< cast<EmitCopyToRegMatcher>(N)->getSrcSlot() << ", "
<< getQualifiedName(cast<EmitCopyToRegMatcher>(N)->getDestPhysReg())
<< ",\n";
return 3;
case Matcher::EmitNodeXForm: {
const EmitNodeXFormMatcher *XF = cast<EmitNodeXFormMatcher>(N);
OS << "OPC_EmitNodeXForm, " << getNodeXFormID(XF->getNodeXForm()) << ", "
<< XF->getSlot() << ',';
OS.PadToColumn(CommentIndent) << "// "<<XF->getNodeXForm()->getName()<<'\n';
return 3;
}
case Matcher::EmitNode:
case Matcher::SelectNodeTo: {
const EmitNodeMatcherCommon *EN = cast<EmitNodeMatcherCommon>(N);
OS << (isa<EmitNodeMatcher>(EN) ? "OPC_EmitNode" : "OPC_SelectNodeTo");
OS << ", 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);
}
// Print the result #'s for EmitNode.
if (const EmitNodeMatcher *E = dyn_cast<EmitNodeMatcher>(EN)) {
if (unsigned NumResults = EN->getNumNonChainFlagVTs()) {
OS.PadToColumn(CommentIndent) << "// Results = ";
unsigned First = E->getFirstResultSlot();
for (unsigned i = 0; i != NumResults; ++i)
OS << "#" << First+i << " ";
}
}
OS << '\n';
if (const SelectNodeToMatcher *SNT = dyn_cast<SelectNodeToMatcher>(N)) {
OS.PadToColumn(Indent*2) << "// Src: "
<< *SNT->getPattern().getSrcPattern() << '\n';
OS.PadToColumn(Indent*2) << "// Dst: "
<< *SNT->getPattern().getDstPattern() << '\n';
}
return 6+EN->getNumVTs()+NumOperandBytes;
}
case Matcher::MarkFlagResults: {
const MarkFlagResultsMatcher *CFR = cast<MarkFlagResultsMatcher>(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 Matcher::CompleteMatch: {
const CompleteMatchMatcher *CM = cast<CompleteMatchMatcher>(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 Matcher *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()]++;
OS << "/*" << CurrentIdx << "*/";
unsigned MatcherSize = EmitMatcher(N, Indent, CurrentIdx, 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 ((Matcher::KindTy)i) {
case Matcher::Scope: OS << "OPC_Scope"; break;
case Matcher::RecordNode: OS << "OPC_RecordNode"; break;
case Matcher::RecordChild: OS << "OPC_RecordChild"; break;
case Matcher::RecordMemRef: OS << "OPC_RecordMemRef"; break;
case Matcher::CaptureFlagInput: OS << "OPC_CaptureFlagInput"; break;
case Matcher::MoveChild: OS << "OPC_MoveChild"; break;
case Matcher::MoveParent: OS << "OPC_MoveParent"; break;
case Matcher::CheckSame: OS << "OPC_CheckSame"; break;
case Matcher::CheckPatternPredicate:
OS << "OPC_CheckPatternPredicate"; break;
case Matcher::CheckPredicate: OS << "OPC_CheckPredicate"; break;
case Matcher::CheckOpcode: OS << "OPC_CheckOpcode"; break;
case Matcher::CheckMultiOpcode: OS << "OPC_CheckMultiOpcode"; break;
case Matcher::CheckType: OS << "OPC_CheckType"; break;
case Matcher::CheckChildType: OS << "OPC_CheckChildType"; break;
case Matcher::CheckInteger: OS << "OPC_CheckInteger"; break;
case Matcher::CheckCondCode: OS << "OPC_CheckCondCode"; break;
case Matcher::CheckValueType: OS << "OPC_CheckValueType"; break;
case Matcher::CheckComplexPat: OS << "OPC_CheckComplexPat"; break;
case Matcher::CheckAndImm: OS << "OPC_CheckAndImm"; break;
case Matcher::CheckOrImm: OS << "OPC_CheckOrImm"; break;
case Matcher::CheckFoldableChainNode:
OS << "OPC_CheckFoldableChainNode"; break;
case Matcher::CheckChainCompatible: OS << "OPC_CheckChainCompatible"; break;
case Matcher::EmitInteger: OS << "OPC_EmitInteger"; break;
case Matcher::EmitStringInteger: OS << "OPC_EmitStringInteger"; break;
case Matcher::EmitRegister: OS << "OPC_EmitRegister"; break;
case Matcher::EmitConvertToTarget: OS << "OPC_EmitConvertToTarget"; break;
case Matcher::EmitMergeInputChains: OS << "OPC_EmitMergeInputChains"; break;
case Matcher::EmitCopyToReg: OS << "OPC_EmitCopyToReg"; break;
case Matcher::EmitNode: OS << "OPC_EmitNode"; break;
case Matcher::SelectNodeTo: OS << "OPC_SelectNodeTo"; break;
case Matcher::EmitNodeXForm: OS << "OPC_EmitNodeXForm"; break;
case Matcher::MarkFlagResults: OS << "OPC_MarkFlagResults"; break;
case Matcher::CompleteMatch: OS << "OPC_CompleteMatch"; break;
}
OS.PadToColumn(40) << " = " << Histogram[i] << '\n';
}
OS << '\n';
}
void llvm::EmitMatcherTable(const Matcher *TheMatcher, 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(TheMatcher, 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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