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Teach the DAG isel generator to emit code that creates nodes.

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Fix a few corner cases parsing things like (i32 imm:$foo)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23417 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-24 00:40:24 +00:00
parent 8fc3568d98
commit 72fe91c4dd
2 changed files with 110 additions and 18 deletions
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125
utils/TableGen/DAGISelEmitter.cpp
View File

@ -405,7 +405,7 @@ MVT::ValueType TreePattern::getIntrinsicType(Record *R) const {
return MVT::LAST_VALUETYPE;
}
error("Unknown value used: " + R->getName());
error("Unknown node flavor used in pattern: " + R->getName());
return MVT::Other;
}
@ -421,6 +421,15 @@ TreePatternNode *TreePattern::ParseTreePattern(DagInit *Dag) {
Init *Arg = Dag->getArg(0);
TreePatternNode *New;
if (DefInit *DI = dynamic_cast<DefInit*>(Arg)) {
Record *R = DI->getDef();
if (R->isSubClassOf("SDNode") || R->isSubClassOf("PatFrag")) {
Dag->setArg(0, new DagInit(R,
std::vector<std::pair<Init*, std::string> >()));
TreePatternNode *TPN = ParseTreePattern(Dag);
TPN->setName(Dag->getArgName(0));
return TPN;
}
New = new TreePatternNode(DI);
// If it's a regclass or something else known, set the type.
New->setType(getIntrinsicType(DI->getDef()));
@ -993,29 +1002,30 @@ void DAGISelEmitter::EmitMatchForPattern(TreePatternNode *N,
std::map<std::string,std::string> &VarMap,
unsigned PatternNo, std::ostream &OS) {
assert(!N->isLeaf() && "Cannot match against a leaf!");
// If this node has a name associated with it, capture it in VarMap. If
// we already saw this in the pattern, emit code to verify dagness.
if (!N->getName().empty()) {
std::string &VarMapEntry = VarMap[N->getName()];
if (VarMapEntry.empty()) {
VarMapEntry = RootName;
} else {
// If we get here, this is a second reference to a specific name. Since
// we already have checked that the first reference is valid, we don't
// have to recursively match it, just check that it's the same as the
// previously named thing.
OS << " if (" << VarMapEntry << " != " << RootName
<< ") goto P" << PatternNo << "Fail;\n";
return;
}
}
// Emit code to load the child nodes and match their contents recursively.
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i) {
OS << " SDOperand " << RootName << i <<" = " << RootName
<< ".getOperand(" << i << ");\n";
TreePatternNode *Child = N->getChild(i);
// If this child has a name associated with it, capture it in VarMap. If
// we already saw this in the pattern, emit code to verify dagness.
if (!Child->getName().empty()) {
std::string &VarMapEntry = VarMap[Child->getName()];
if (VarMapEntry.empty()) {
VarMapEntry = RootName + utostr(i);
} else {
// If we get here, this is a second reference to a specific name. Since
// we already have checked that the first reference is valid, we don't
// have to recursively match it, just check that it's the same as the
// previously named thing.
OS << " if (" << VarMapEntry << " != " << RootName << i
<< ") goto P" << PatternNo << "Fail;\n";
continue;
}
}
if (!Child->isLeaf()) {
// If it's not a leaf, recursively match.
const SDNodeInfo &CInfo = getSDNodeInfo(Child->getOperator());
@ -1023,6 +1033,23 @@ void DAGISelEmitter::EmitMatchForPattern(TreePatternNode *N,
<< CInfo.getEnumName() << ") goto P" << PatternNo << "Fail;\n";
EmitMatchForPattern(Child, RootName + utostr(i), VarMap, PatternNo, OS);
} else {
// If this child has a name associated with it, capture it in VarMap. If
// we already saw this in the pattern, emit code to verify dagness.
if (!Child->getName().empty()) {
std::string &VarMapEntry = VarMap[Child->getName()];
if (VarMapEntry.empty()) {
VarMapEntry = RootName + utostr(i);
} else {
// If we get here, this is a second reference to a specific name. Since
// we already have checked that the first reference is valid, we don't
// have to recursively match it, just check that it's the same as the
// previously named thing.
OS << " if (" << VarMapEntry << " != " << RootName << i
<< ") goto P" << PatternNo << "Fail;\n";
continue;
}
}
// Handle leaves of various types.
Init *LeafVal = Child->getLeafValue();
Record *LeafRec = dynamic_cast<DefInit*>(LeafVal)->getDef();
@ -1046,6 +1073,65 @@ void DAGISelEmitter::EmitMatchForPattern(TreePatternNode *N,
<< ".Val)) goto P" << PatternNo << "Fail;\n";
}
unsigned DAGISelEmitter::
CodeGenPatternResult(TreePatternNode *N, unsigned &Ctr,
std::map<std::string,std::string> &VariableMap,
std::ostream &OS){
// This is something selected from the pattern we matched.
if (!N->getName().empty()) {
const std::string &Val = VariableMap[N->getName()];
assert(!Val.empty() &&
"Variable referenced but not defined and not caught earlier!");
if (Val[0] == 'T' && Val[1] == 'm' && Val[2] == 'p') {
// Already selected this operand, just return the tmpval.
// FIXME: DO THIS.
} else {
unsigned ResNo = Ctr++;
OS << " SDOperand Tmp" << ResNo << " = Select(" << Val << ");\n";
// FIXME: Add Tmp<ResNo> to VariableMap.
return ResNo;
}
}
if (N->isLeaf()) {
N->dump();
assert(0 && "Unknown leaf type!");
return ~0U;
}
Record *Op = N->getOperator();
if (Op->isSubClassOf("Instruction")) {
// Emit all of the operands.
std::vector<unsigned> Ops;
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i)
Ops.push_back(CodeGenPatternResult(N->getChild(i), Ctr, VariableMap, OS));
CodeGenInstruction &II = Target.getInstruction(Op->getName());
unsigned ResNo = Ctr++;
OS << " SDOperand Tmp" << ResNo << " = CurDAG->getTargetNode("
<< II.Namespace << "::" << II.TheDef->getName() << ", MVT::"
<< getEnumName(N->getType());
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
OS << ", Tmp" << Ops[i];
OS << ");\n";
return ResNo;
} else if (Op->isSubClassOf("SDNodeXForm")) {
assert(N->getNumChildren() == 1 && "node xform should have one child!");
unsigned OpVal = CodeGenPatternResult(N->getChild(0), Ctr, VariableMap, OS);
unsigned ResNo = Ctr++;
OS << " SDOperand Tmp" << ResNo << " = Transform_" << Op->getName()
<< "(Tmp" << OpVal << ".Val);\n";
return ResNo;
} else {
N->dump();
assert(0 && "Unknown node in result pattern!");
}
}
/// EmitCodeForPattern - Given a pattern to match, emit code to the specified
/// stream to match the pattern, and generate the code for the match if it
/// succeeds.
@ -1065,6 +1151,9 @@ void DAGISelEmitter::EmitCodeForPattern(PatternToMatch &Pattern,
Pattern.second->print(OS);
OS << "\n";
unsigned TmpNo = 0;
unsigned Res = CodeGenPatternResult(Pattern.second, TmpNo, VariableMap, OS);
OS << " return Tmp" << Res << ";\n";
OS << " }\n P" << PatternNo << "Fail:\n";
}

3
utils/TableGen/DAGISelEmitter.h
View File

@ -368,6 +368,9 @@ private:
void EmitMatchForPattern(TreePatternNode *N, const std::string &RootName,
std::map<std::string,std::string> &VarMap,
unsigned PatternNo, std::ostream &OS);
unsigned CodeGenPatternResult(TreePatternNode *N, unsigned &Ctr,
std::map<std::string,std::string> &VariableMap,
std::ostream &OS);
void EmitCodeForPattern(PatternToMatch &Pattern, std::ostream &OS);
void EmitInstructionSelector(std::ostream &OS);
};