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This implements a large amount of the matcher, in fact, all of it except for one bug

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llvm-svn: 7702
This commit is contained in:
Chris Lattner 2003-08-08 22:29:23 +00:00
parent f169468353
commit 1f87681075
2 changed files with 379 additions and 49 deletions
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397
support/tools/TableGen/InstrSelectorEmitter.cpp
View File

@ -9,6 +9,8 @@
#include "CodeGenWrappers.h"
#include "Record.h"
#include "Support/Debug.h"
#include "Support/StringExtras.h"
#include <set>
NodeType::ArgResultTypes NodeType::Translate(Record *R) {
const std::string &Name = R->getName();
@ -24,6 +26,15 @@ NodeType::ArgResultTypes NodeType::Translate(Record *R) {
// TreePatternNode implementation
//
/// getValueRecord - Returns the value of this tree node as a record. For now
/// we only allow DefInit's as our leaf values, so this is used.
Record *TreePatternNode::getValueRecord() const {
DefInit *DI = dynamic_cast<DefInit*>(getValue());
assert(DI && "Instruction Selector does not yet support non-def leaves!");
return DI->getDef();
}
// updateNodeType - Set the node type of N to VT if VT contains information. If
// N already contains a conflicting type, then throw an exception
//
@ -50,17 +61,17 @@ void TreePatternNode::InstantiateNonterminals(InstrSelectorEmitter &ISE) {
}
// If this is a leaf, it might be a reference to a nonterminal! Check now.
if (DefInit *DI = dynamic_cast<DefInit*>(getValue()))
if (DI->getDef()->isSubClassOf("Nonterminal")) {
Pattern *NT = ISE.getPattern(DI->getDef());
if (!NT->isResolved()) {
// We found an unresolved nonterminal reference. Ask the ISE to clone
// it for us, then update our reference to the fresh, new, resolved,
// nonterminal.
Value = new DefInit(ISE.InstantiateNonterminal(NT, getType()));
}
Record *R = getValueRecord();
if (R->isSubClassOf("Nonterminal")) {
Pattern *NT = ISE.getPattern(R);
if (!NT->isResolved()) {
// We found an unresolved nonterminal reference. Ask the ISE to clone
// it for us, then update our reference to the fresh, new, resolved,
// nonterminal.
Value = new DefInit(ISE.InstantiateNonterminal(NT, getType()));
}
}
}
@ -80,7 +91,6 @@ TreePatternNode *TreePatternNode::clone() const {
return New;
}
std::ostream &operator<<(std::ostream &OS, const TreePatternNode &N) {
if (N.isLeaf())
return OS << N.getType() << ":" << *N.getValue();
@ -126,11 +136,7 @@ Pattern::Pattern(PatternType pty, DagInit *RawPat, Record *TheRec,
assert(Tree->getChildren().size() == 2 && "Set with != 2 arguments?");
if (!Tree->getChild(0)->isLeaf())
error("Arg #0 of set should be a register or register class!");
DefInit *RegInit = dynamic_cast<DefInit*>(Tree->getChild(0)->getValue());
if (RegInit == 0)
error("LHS of 'set' expected to be a register or register class!");
Result = RegInit->getDef();
Result = Tree->getChild(0)->getValueRecord();
Tree = Tree->getChild(1);
}
}
@ -232,8 +238,7 @@ bool Pattern::InferTypes(TreePatternNode *N, bool &MadeChange) {
bool AnyUnset = false;
Record *Operator = N->getOperator();
assert(ISE.getNodeTypes().count(Operator) && "No node info for node!");
const NodeType &NT = ISE.getNodeTypes()[Operator];
const NodeType &NT = ISE.getNodeType(Operator);
// Check to see if we can infer anything about the argument types from the
// return types...
@ -317,6 +322,38 @@ std::ostream &operator<<(std::ostream &OS, const Pattern &P) {
}
/// getSlotName - If this is a leaf node, return the slot name that the operand
/// will update.
std::string Pattern::getSlotName() const {
if (getPatternType() == Pattern::Nonterminal) {
// Just use the nonterminal name, which will already include the type if
// it has been cloned.
return getRecord()->getName();
} else {
std::string SlotName;
if (getResult())
SlotName = getResult()->getName()+"_";
else
SlotName = "Void_";
return SlotName + getName(getTree()->getType());
}
}
/// getSlotName - If this is a leaf node, return the slot name that the
/// operand will update.
std::string Pattern::getSlotName(Record *R) {
if (R->isSubClassOf("Nonterminal")) {
// Just use the nonterminal name, which will already include the type if
// it has been cloned.
return R->getName();
} else if (R->isSubClassOf("RegisterClass")) {
MVT::ValueType Ty = getValueType(R->getValueAsDef("RegType"));
return R->getName() + "_" + getName(Ty);
} else {
assert(0 && "Don't know how to get a slot name for this!");
}
}
//===----------------------------------------------------------------------===//
// PatternOrganizer implementation
//
@ -324,29 +361,12 @@ std::ostream &operator<<(std::ostream &OS, const Pattern &P) {
/// addPattern - Add the specified pattern to the appropriate location in the
/// collection.
void PatternOrganizer::addPattern(Pattern *P) {
std::string ValueName;
if (P->getPatternType() == Pattern::Nonterminal) {
// Just use the nonterminal name, which will already include the type if
// it has been cloned.
ValueName = P->getRecord()->getName();
} else {
if (P->getResult())
ValueName += P->getResult()->getName()+"_";
else
ValueName += "Void_";
ValueName += getName(P->getTree()->getType());
}
NodesForSlot &Nodes = AllPatterns[ValueName];
NodesForSlot &Nodes = AllPatterns[P->getSlotName()];
if (!P->getTree()->isLeaf())
Nodes[P->getTree()->getOperator()].push_back(P);
else {
// Right now we only support DefInit's with node types...
DefInit *Val = dynamic_cast<DefInit*>(P->getTree()->getValue());
if (!Val)
throw std::string("We only support def inits in PatternOrganizer"
"::addPattern so far!");
Nodes[Val->getDef()].push_back(P);
Nodes[P->getTree()->getValueRecord()].push_back(P);
}
}
@ -469,6 +489,11 @@ Record *InstrSelectorEmitter::InstantiateNonterminal(Pattern *NT,
Record *New = new Record(NT->getRecord()->getName()+"_"+getName(ResultTy));
// Copy over the superclasses...
const std::vector<Record*> &SCs = NT->getRecord()->getSuperClasses();
for (unsigned i = 0, e = SCs.size(); i != e; ++i)
New->addSuperClass(SCs[i]);
DEBUG(std::cerr << " Nonterminal '" << NT->getRecord()->getName()
<< "' for type '" << getName(ResultTy) << "', producing '"
<< New->getName() << "'\n");
@ -503,6 +528,242 @@ void InstrSelectorEmitter::CalculateComputableValues() {
ComputableValues.addPattern(I->second);
}
#if 0
// MoveIdenticalPatterns - Given a tree pattern 'P', move all of the tree
// patterns which have the same top-level structure as P from the 'From' list to
// the 'To' list.
static void MoveIdenticalPatterns(TreePatternNode *P,
std::vector<std::pair<Pattern*, TreePatternNode*> > &From,
std::vector<std::pair<Pattern*, TreePatternNode*> > &To) {
assert(!P->isLeaf() && "All leaves are identical!");
const std::vector<TreePatternNode*> &PChildren = P->getChildren();
for (unsigned i = 0; i != From.size(); ++i) {
TreePatternNode *N = From[i].second;
assert(P->getOperator() == N->getOperator() &&"Differing operators?");
assert(PChildren.size() == N->getChildren().size() &&
"Nodes with different arity??");
bool isDifferent = false;
for (unsigned c = 0, e = PChildren.size(); c != e; ++c) {
TreePatternNode *PC = PChildren[c];
TreePatternNode *NC = N->getChild(c);
if (PC->isLeaf() != NC->isLeaf()) {
isDifferent = true;
break;
}
if (!PC->isLeaf()) {
if (PC->getOperator() != NC->getOperator()) {
isDifferent = true;
break;
}
} else { // It's a leaf!
if (PC->getValueRecord() != NC->getValueRecord()) {
isDifferent = true;
break;
}
}
}
// If it's the same as the reference one, move it over now...
if (!isDifferent) {
To.push_back(std::make_pair(From[i].first, N));
From.erase(From.begin()+i);
--i; // Don't skip an entry...
}
}
}
#endif
static void EmitPatternPredicates(TreePatternNode *Tree,
const std::string &VarName, std::ostream &OS){
OS << " && " << VarName << "->getNodeType() == ISD::"
<< Tree->getOperator()->getName();
for (unsigned c = 0, e = Tree->getNumChildren(); c != e; ++c)
if (!Tree->getChild(c)->isLeaf())
EmitPatternPredicates(Tree->getChild(c),
VarName + "->getUse(" + utostr(c)+")", OS);
}
static void EmitPatternCosts(TreePatternNode *Tree, const std::string &VarName,
std::ostream &OS) {
for (unsigned c = 0, e = Tree->getNumChildren(); c != e; ++c)
if (Tree->getChild(c)->isLeaf()) {
OS << " + Match_"
<< Pattern::getSlotName(Tree->getChild(c)->getValueRecord()) << "("
<< VarName << "->getUse(" << c << "))";
} else {
EmitPatternCosts(Tree->getChild(c),
VarName + "->getUse(" + utostr(c) + ")", OS);
}
}
// EmitMatchCosters - Given a list of patterns, which all have the same root
// pattern operator, emit an efficient decision tree to decide which one to
// pick. This is structured this way to avoid reevaluations of non-obvious
// subexpressions.
void InstrSelectorEmitter::EmitMatchCosters(std::ostream &OS,
const std::vector<std::pair<Pattern*, TreePatternNode*> > &Patterns,
const std::string &VarPrefix,
unsigned IndentAmt) {
assert(!Patterns.empty() && "No patterns to emit matchers for!");
std::string Indent(IndentAmt, ' ');
// Load all of the operands of the root node into scalars for fast access
const NodeType &ONT = getNodeType(Patterns[0].second->getOperator());
for (unsigned i = 0, e = ONT.ArgTypes.size(); i != e; ++i)
OS << Indent << "SelectionDAGNode *" << VarPrefix << "_Op" << i
<< " = N->getUse(" << i << ");\n";
// Compute the costs of computing the various nonterminals/registers, which
// are directly used at this level.
OS << "\n" << Indent << "// Operand matching costs...\n";
std::set<std::string> ComputedValues; // Avoid duplicate computations...
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
const std::vector<TreePatternNode*> &Children =
Patterns[i].second->getChildren();
for (unsigned c = 0, e = Children.size(); c != e; ++c) {
TreePatternNode *N = Children[c];
if (N->isLeaf()) {
Record *VR = N->getValueRecord();
const std::string &LeafName = VR->getName();
std::string OpName = VarPrefix + "_Op" + utostr(c);
std::string ValName = OpName + "_" + LeafName + "_Cost";
if (!ComputedValues.count(ValName)) {
OS << Indent << "unsigned " << ValName << " = Match_"
<< Pattern::getSlotName(VR) << "(" << OpName << ");\n";
ComputedValues.insert(ValName);
}
}
}
}
OS << "\n";
std::string LocCostName = VarPrefix + "_Cost";
OS << Indent << "unsigned " << LocCostName << "Min = ~0U >> 1;\n"
<< Indent << "unsigned " << VarPrefix << "_PatternMin = NoMatch;\n";
#if 0
// Separate out all of the patterns into groups based on what their top-level
// signature looks like...
std::vector<std::pair<Pattern*, TreePatternNode*> > PatternsLeft(Patterns);
while (!PatternsLeft.empty()) {
// Process all of the patterns that have the same signature as the last
// element...
std::vector<std::pair<Pattern*, TreePatternNode*> > Group;
MoveIdenticalPatterns(PatternsLeft.back().second, PatternsLeft, Group);
assert(!Group.empty() && "Didn't at least pick the source pattern?");
#if 0
OS << "PROCESSING GROUP:\n";
for (unsigned i = 0, e = Group.size(); i != e; ++i)
OS << " " << *Group[i].first << "\n";
OS << "\n\n";
#endif
OS << Indent << "{ // ";
if (Group.size() != 1) {
OS << Group.size() << " size group...\n";
OS << Indent << " unsigned " << VarPrefix << "_Pattern = NoMatch;\n";
} else {
OS << *Group[0].first << "\n";
OS << Indent << " unsigned " << VarPrefix << "_Pattern = "
<< Group[0].first->getRecord()->getName() << "_Pattern;\n";
}
OS << Indent << " unsigned " << LocCostName << " = ";
if (Group.size() == 1)
OS << "1;\n"; // Add inst cost if at individual rec
else
OS << "0;\n";
// Loop over all of the operands, adding in their costs...
TreePatternNode *N = Group[0].second;
const std::vector<TreePatternNode*> &Children = N->getChildren();
// If necessary, emit conditionals to check for the appropriate tree
// structure here...
for (unsigned i = 0, e = Children.size(); i != e; ++i) {
TreePatternNode *C = Children[i];
if (C->isLeaf()) {
// We already calculated the cost for this leaf, add it in now...
OS << Indent << " " << LocCostName << " += "
<< VarPrefix << "_Op" << utostr(i) << "_"
<< C->getValueRecord()->getName() << "_Cost;\n";
} else {
// If it's not a leaf, we have to check to make sure that the current
// node has the appropriate structure, then recurse into it...
OS << Indent << " if (" << VarPrefix << "_Op" << i
<< "->getNodeType() == ISD::" << C->getOperator()->getName()
<< ") {\n";
std::vector<std::pair<Pattern*, TreePatternNode*> > SubPatterns;
for (unsigned n = 0, e = Group.size(); n != e; ++n)
SubPatterns.push_back(std::make_pair(Group[n].first,
Group[n].second->getChild(i)));
EmitMatchCosters(OS, SubPatterns, VarPrefix+"_Op"+utostr(i),
IndentAmt + 4);
OS << Indent << " }\n";
}
}
// If the cost for this match is less than the minimum computed cost so far,
// update the minimum cost and selected pattern.
OS << Indent << " if (" << LocCostName << " < " << LocCostName << "Min) { "
<< LocCostName << "Min = " << LocCostName << "; " << VarPrefix
<< "_PatternMin = " << VarPrefix << "_Pattern; }\n";
OS << Indent << "}\n";
}
#endif
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
Pattern *P = Patterns[i].first;
TreePatternNode *PTree = P->getTree();
unsigned PatternCost = 1;
// Check to see if there are any non-leaf elements in the pattern. If so,
// we need to emit a predicate for this match.
bool AnyNonLeaf = false;
for (unsigned c = 0, e = PTree->getNumChildren(); c != e; ++c)
if (!PTree->getChild(c)->isLeaf()) {
AnyNonLeaf = true;
break;
}
if (!AnyNonLeaf) { // No predicate necessary, just output a scope...
OS << " {// " << *P << "\n";
} else {
// We need to emit a predicate to make sure the tree pattern matches, do
// so now...
OS << " if (1";
for (unsigned c = 0, e = PTree->getNumChildren(); c != e; ++c)
if (!PTree->getChild(c)->isLeaf())
EmitPatternPredicates(PTree->getChild(c),
VarPrefix + "_Op" + utostr(c), OS);
OS << ") {\n // " << *P << "\n";
}
OS << " unsigned PatCost = " << PatternCost;
for (unsigned c = 0, e = PTree->getNumChildren(); c != e; ++c)
if (PTree->getChild(c)->isLeaf()) {
OS << " + " << VarPrefix << "_Op" << c << "_"
<< PTree->getChild(c)->getValueRecord()->getName() << "_Cost";
} else {
EmitPatternCosts(PTree->getChild(c), VarPrefix + "_Op" + utostr(c), OS);
}
OS << ";\n";
OS << " if (PatCost < MinCost) { MinCost = PatCost; Pattern = "
<< P->getRecord()->getName() << "_Pattern; }\n"
<< " }\n";
}
}
void InstrSelectorEmitter::run(std::ostream &OS) {
// Type-check all of the node types to ensure we "understand" them.
ReadNodeTypes();
@ -570,30 +831,30 @@ void InstrSelectorEmitter::run(std::ostream &OS) {
<< " }\n\n"
<< " // DAG matching methods for classes... all of these methods"
" return the cost\n"
<<" // of producing a value of the specified class and type, which"
<< " // of producing a value of the specified class and type, which"
" also gets\n"
<< " // added to the DAG node.\n";
// Output all of the matching prototypes for slots...
for (PatternOrganizer::iterator I = ComputableValues.begin(),
E = ComputableValues.end(); I != E; ++I)
OS << " unsigned Match_" << I->first << "(SelectionDAGNode *N);\n";
OS << "\n // DAG matching methods for DAG nodes...\n";
OS << " unsigned Match_" << I->first << "(SelectionDAGNode *N);\n";
OS << "\n // DAG matching methods for DAG nodes...\n";
// Output all of the matching prototypes for slot/node pairs
for (PatternOrganizer::iterator I = ComputableValues.begin(),
E = ComputableValues.end(); I != E; ++I)
for (PatternOrganizer::NodesForSlot::iterator J = I->second.begin(),
E = I->second.end(); J != E; ++J)
OS << " unsigned Match_" << I->first << "_" << J->first->getName()
OS << " unsigned Match_" << I->first << "_" << J->first->getName()
<< "(SelectionDAGNode *N);\n";
// Output all of the dag reduction methods prototypes...
OS << "\n // DAG reduction methods...\n";
OS << "\n // DAG reduction methods...\n";
for (PatternOrganizer::iterator I = ComputableValues.begin(),
E = ComputableValues.end(); I != E; ++I)
OS << " ReducedValue_" << I->first << " *Reduce_" << I->first
<< "(SelectionDAGNode *N,\n" << std::string(25+2*I->first.size(), ' ')
OS << " ReducedValue_" << I->first << " *Reduce_" << I->first
<< "(SelectionDAGNode *N,\n" << std::string(27+2*I->first.size(), ' ')
<< "MachineBasicBlock *MBB);\n";
OS << " };\n}\n\n";
@ -613,6 +874,52 @@ void InstrSelectorEmitter::run(std::ostream &OS) {
<< "}\n\n"
<< "//===" << std::string(70, '-') << "===//\n"
<< "// Matching methods...\n"
<< "//\n";
<< "//\n\n";
for (PatternOrganizer::iterator I = ComputableValues.begin(),
E = ComputableValues.end(); I != E; ++I) {
const std::string &SlotName = I->first;
OS << "unsigned " << Target.getName() << "ISel::Match_" << SlotName
<< "(SelectionDAGNode *N) {\n"
<< " assert(N->getValueType() == ISD::"
<< getName((*I->second.begin()).second[0]->getTree()->getType())<< ");\n"
<< " // If we already have a cost available for " << SlotName
<< " use it!\n"
<< " if (N->getPatternFor(" << SlotName << "_Slot))\n"
<< " return N->getCostFor(" << SlotName << "_Slot);\n\n"
<< " unsigned Cost;\n"
<< " switch (N->getNodeType()) {\n"
<< " default: assert(0 && \"Unhandled node type for " << SlotName
<< "!\");\n";
for (PatternOrganizer::NodesForSlot::iterator J = I->second.begin(),
E = I->second.end(); J != E; ++J)
OS << " case ISD::" << J->first->getName() << ":\tCost = Match_"
<< SlotName << "_" << J->first->getName() << "(N); break;\n";
OS << " }\n return Cost;\n}\n\n";
for (PatternOrganizer::NodesForSlot::iterator J = I->second.begin(),
E = I->second.end(); J != E; ++J) {
Record *Operator = J->first;
OS << "unsigned " << Target.getName() << "ISel::Match_" << SlotName << "_"
<< Operator->getName() << "(SelectionDAGNode *N) {\n"
<< " unsigned Pattern = NoMatchPattern;\n"
<< " unsigned MinCost = ~0U >> 1;\n";
std::vector<std::pair<Pattern*, TreePatternNode*> > Patterns;
for (unsigned i = 0, e = J->second.size(); i != e; ++i)
Patterns.push_back(std::make_pair(J->second[i],
J->second[i]->getTree()));
EmitMatchCosters(OS, Patterns, "N", 2);
OS << "\n N->setPatternCostFor(" << SlotName
<< "_Slot, Pattern, MinCost, NumSlots);\n"
<< " return MinCost;\n"
<< "}\n";
}
break; // FIXME: REMOVE
}
}

31
support/tools/TableGen/InstrSelectorEmitter.h
View File

@ -80,6 +80,7 @@ public:
assert(Operator != 0 && "This is a leaf node!");
return Children;
}
unsigned getNumChildren() const { return Children.size(); }
TreePatternNode *getChild(unsigned c) const {
assert(c < Children.size() && "Child access out of range!");
return getChildren()[c];
@ -90,6 +91,10 @@ public:
return Value;
}
/// getValueRecord - Returns the value of this tree node as a record. For now
/// we only allow DefInit's as our leaf values, so this is used.
Record *getValueRecord() const;
/// clone - Make a copy of this tree and all of its children.
///
TreePatternNode *clone() const;
@ -101,10 +106,10 @@ public:
/// it with the using context we provide.
void InstantiateNonterminals(InstrSelectorEmitter &ISE);
// UpdateNodeType - Set the node type of N to VT if VT contains information.
// If N already contains a conflicting type, then throw an exception. This
// returns true if any information was updated.
//
/// UpdateNodeType - Set the node type of N to VT if VT contains information.
/// If N already contains a conflicting type, then throw an exception. This
/// returns true if any information was updated.
///
bool updateNodeType(MVT::ValueType VT, const std::string &RecName);
};
@ -198,6 +203,11 @@ public:
/// pattern.
void error(const std::string &Msg) const;
/// getSlotName - If this is a leaf node, return the slot name that the
/// operand will update.
std::string getSlotName() const;
static std::string getSlotName(Record *R);
private:
MVT::ValueType getIntrinsicType(Record *R) const;
TreePatternNode *ParseTreePattern(DagInit *DI);
@ -270,6 +280,11 @@ public:
const CodeGenTarget &getTarget() const { return Target; }
std::map<Record*, NodeType> &getNodeTypes() { return NodeTypes; }
const NodeType &getNodeType(Record *R) const {
std::map<Record*, NodeType>::const_iterator I = NodeTypes.find(R);
assert(I != NodeTypes.end() && "Unknown node type!");
return I->second;
}
/// getPattern - return the pattern corresponding to the specified record, or
/// null if there is none.
@ -313,6 +328,14 @@ private:
// CalculateComputableValues - Fill in the ComputableValues map through
// analysis of the patterns we are playing with.
void CalculateComputableValues();
// EmitMatchCosters - Given a list of patterns, which all have the same root
// pattern operator, emit an efficient decision tree to decide which one to
// pick. This is structured this way to avoid reevaluations of non-obvious
// subexpressions.
void EmitMatchCosters(std::ostream &OS,
const std::vector<std::pair<Pattern*, TreePatternNode*> > &Patterns,
const std::string &VarPrefix, unsigned Indent);
};
#endif