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llvm-mirror/utils/TableGen/CodeGenDAGPatterns.cpp
Chris Lattner 5b5d31f533 add some #if 0'd out code for checking that named values in 
input/output patterns have the same type.  It turns out that 
this triggers all the time because we don't infer types 
between these boundaries.  Until we do, don't turn this on.

llvm-svn: 96905
2010-02-23 07:50:58 +00:00

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//===- CodeGenDAGPatterns.cpp - Read DAG patterns from .td file -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the CodeGenDAGPatterns class, which is used to read and
// represent the patterns present in a .td file for instructions.
//
//===----------------------------------------------------------------------===//
#include "CodeGenDAGPatterns.h"
#include "Record.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Debug.h"
#include <set>
#include <algorithm>
#include <iostream>
using namespace llvm;
//===----------------------------------------------------------------------===//
// Helpers for working with extended types.
/// FilterVTs - Filter a list of VT's according to a predicate.
///
template<typename T>
static std::vector<MVT::SimpleValueType>
FilterVTs(const std::vector<MVT::SimpleValueType> &InVTs, T Filter) {
std::vector<MVT::SimpleValueType> Result;
for (unsigned i = 0, e = InVTs.size(); i != e; ++i)
if (Filter(InVTs[i]))
Result.push_back(InVTs[i]);
return Result;
}
template<typename T>
static std::vector<unsigned char>
FilterEVTs(const std::vector<unsigned char> &InVTs, T Filter) {
std::vector<unsigned char> Result;
for (unsigned i = 0, e = InVTs.size(); i != e; ++i)
if (Filter((MVT::SimpleValueType)InVTs[i]))
Result.push_back(InVTs[i]);
return Result;
}
static std::vector<unsigned char>
ConvertVTs(const std::vector<MVT::SimpleValueType> &InVTs) {
std::vector<unsigned char> Result;
for (unsigned i = 0, e = InVTs.size(); i != e; ++i)
Result.push_back(InVTs[i]);
return Result;
}
static inline bool isInteger(MVT::SimpleValueType VT) {
return EVT(VT).isInteger();
}
static inline bool isFloatingPoint(MVT::SimpleValueType VT) {
return EVT(VT).isFloatingPoint();
}
static inline bool isVector(MVT::SimpleValueType VT) {
return EVT(VT).isVector();
}
static bool LHSIsSubsetOfRHS(const std::vector<unsigned char> &LHS,
const std::vector<unsigned char> &RHS) {
if (LHS.size() > RHS.size()) return false;
for (unsigned i = 0, e = LHS.size(); i != e; ++i)
if (std::find(RHS.begin(), RHS.end(), LHS[i]) == RHS.end())
return false;
return true;
}
namespace llvm {
namespace EEVT {
/// isExtIntegerInVTs - Return true if the specified extended value type vector
/// contains iAny or an integer value type.
bool isExtIntegerInVTs(const std::vector<unsigned char> &EVTs) {
assert(!EVTs.empty() && "Cannot check for integer in empty ExtVT list!");
return EVTs[0] == MVT::iAny || !(FilterEVTs(EVTs, isInteger).empty());
}
/// isExtFloatingPointInVTs - Return true if the specified extended value type
/// vector contains fAny or a FP value type.
bool isExtFloatingPointInVTs(const std::vector<unsigned char> &EVTs) {
assert(!EVTs.empty() && "Cannot check for FP in empty ExtVT list!");
return EVTs[0] == MVT::fAny || !(FilterEVTs(EVTs, isFloatingPoint).empty());
}
/// isExtVectorInVTs - Return true if the specified extended value type
/// vector contains vAny or a vector value type.
bool isExtVectorInVTs(const std::vector<unsigned char> &EVTs) {
assert(!EVTs.empty() && "Cannot check for vector in empty ExtVT list!");
return EVTs[0] == MVT::vAny || !(FilterEVTs(EVTs, isVector).empty());
}
} // end namespace EEVT.
} // end namespace llvm.
bool RecordPtrCmp::operator()(const Record *LHS, const Record *RHS) const {
return LHS->getID() < RHS->getID();
}
/// Dependent variable map for CodeGenDAGPattern variant generation
typedef std::map<std::string, int> DepVarMap;
/// Const iterator shorthand for DepVarMap
typedef DepVarMap::const_iterator DepVarMap_citer;
namespace {
void FindDepVarsOf(TreePatternNode *N, DepVarMap &DepMap) {
if (N->isLeaf()) {
if (dynamic_cast<DefInit*>(N->getLeafValue()) != NULL) {
DepMap[N->getName()]++;
}
} else {
for (size_t i = 0, e = N->getNumChildren(); i != e; ++i)
FindDepVarsOf(N->getChild(i), DepMap);
}
}
//! Find dependent variables within child patterns
/*!
*/
void FindDepVars(TreePatternNode *N, MultipleUseVarSet &DepVars) {
DepVarMap depcounts;
FindDepVarsOf(N, depcounts);
for (DepVarMap_citer i = depcounts.begin(); i != depcounts.end(); ++i) {
if (i->second > 1) { // std::pair<std::string, int>
DepVars.insert(i->first);
}
}
}
//! Dump the dependent variable set:
void DumpDepVars(MultipleUseVarSet &DepVars) {
if (DepVars.empty()) {
DEBUG(errs() << "<empty set>");
} else {
DEBUG(errs() << "[ ");
for (MultipleUseVarSet::const_iterator i = DepVars.begin(), e = DepVars.end();
i != e; ++i) {
DEBUG(errs() << (*i) << " ");
}
DEBUG(errs() << "]");
}
}
}
//===----------------------------------------------------------------------===//
// PatternToMatch implementation
//
/// getPredicateCheck - Return a single string containing all of this
/// pattern's predicates concatenated with "&&" operators.
///
std::string PatternToMatch::getPredicateCheck() const {
std::string PredicateCheck;
for (unsigned i = 0, e = Predicates->getSize(); i != e; ++i) {
if (DefInit *Pred = dynamic_cast<DefInit*>(Predicates->getElement(i))) {
Record *Def = Pred->getDef();
if (!Def->isSubClassOf("Predicate")) {
#ifndef NDEBUG
Def->dump();
#endif
assert(0 && "Unknown predicate type!");
}
if (!PredicateCheck.empty())
PredicateCheck += " && ";
PredicateCheck += "(" + Def->getValueAsString("CondString") + ")";
}
}
return PredicateCheck;
}
//===----------------------------------------------------------------------===//
// SDTypeConstraint implementation
//
SDTypeConstraint::SDTypeConstraint(Record *R) {
OperandNo = R->getValueAsInt("OperandNum");
if (R->isSubClassOf("SDTCisVT")) {
ConstraintType = SDTCisVT;
x.SDTCisVT_Info.VT = getValueType(R->getValueAsDef("VT"));
} else if (R->isSubClassOf("SDTCisPtrTy")) {
ConstraintType = SDTCisPtrTy;
} else if (R->isSubClassOf("SDTCisInt")) {
ConstraintType = SDTCisInt;
} else if (R->isSubClassOf("SDTCisFP")) {
ConstraintType = SDTCisFP;
} else if (R->isSubClassOf("SDTCisVec")) {
ConstraintType = SDTCisVec;
} else if (R->isSubClassOf("SDTCisSameAs")) {
ConstraintType = SDTCisSameAs;
x.SDTCisSameAs_Info.OtherOperandNum = R->getValueAsInt("OtherOperandNum");
} else if (R->isSubClassOf("SDTCisVTSmallerThanOp")) {
ConstraintType = SDTCisVTSmallerThanOp;
x.SDTCisVTSmallerThanOp_Info.OtherOperandNum =
R->getValueAsInt("OtherOperandNum");
} else if (R->isSubClassOf("SDTCisOpSmallerThanOp")) {
ConstraintType = SDTCisOpSmallerThanOp;
x.SDTCisOpSmallerThanOp_Info.BigOperandNum =
R->getValueAsInt("BigOperandNum");
} else if (R->isSubClassOf("SDTCisEltOfVec")) {
ConstraintType = SDTCisEltOfVec;
x.SDTCisEltOfVec_Info.OtherOperandNum =
R->getValueAsInt("OtherOpNum");
} else {
errs() << "Unrecognized SDTypeConstraint '" << R->getName() << "'!\n";
exit(1);
}
}
/// getOperandNum - Return the node corresponding to operand #OpNo in tree
/// N, which has NumResults results.
TreePatternNode *SDTypeConstraint::getOperandNum(unsigned OpNo,
TreePatternNode *N,
unsigned NumResults) const {
assert(NumResults <= 1 &&
"We only work with nodes with zero or one result so far!");
if (OpNo >= (NumResults + N->getNumChildren())) {
errs() << "Invalid operand number " << OpNo << " ";
N->dump();
errs() << '\n';
exit(1);
}
if (OpNo < NumResults)
return N; // FIXME: need value #
else
return N->getChild(OpNo-NumResults);
}
/// ApplyTypeConstraint - Given a node in a pattern, apply this type
/// constraint to the nodes operands. This returns true if it makes a
/// change, false otherwise. If a type contradiction is found, throw an
/// exception.
bool SDTypeConstraint::ApplyTypeConstraint(TreePatternNode *N,
const SDNodeInfo &NodeInfo,
TreePattern &TP) const {
unsigned NumResults = NodeInfo.getNumResults();
assert(NumResults <= 1 &&
"We only work with nodes with zero or one result so far!");
// Check that the number of operands is sane. Negative operands -> varargs.
if (NodeInfo.getNumOperands() >= 0) {
if (N->getNumChildren() != (unsigned)NodeInfo.getNumOperands())
TP.error(N->getOperator()->getName() + " node requires exactly " +
itostr(NodeInfo.getNumOperands()) + " operands!");
}
const CodeGenTarget &CGT = TP.getDAGPatterns().getTargetInfo();
TreePatternNode *NodeToApply = getOperandNum(OperandNo, N, NumResults);
switch (ConstraintType) {
default: assert(0 && "Unknown constraint type!");
case SDTCisVT:
// Operand must be a particular type.
return NodeToApply->UpdateNodeType(x.SDTCisVT_Info.VT, TP);
case SDTCisPtrTy: {
// Operand must be same as target pointer type.
return NodeToApply->UpdateNodeType(MVT::iPTR, TP);
}
case SDTCisInt: {
// If there is only one integer type supported, this must be it.
std::vector<MVT::SimpleValueType> IntVTs =
FilterVTs(CGT.getLegalValueTypes(), isInteger);
// If we found exactly one supported integer type, apply it.
if (IntVTs.size() == 1)
return NodeToApply->UpdateNodeType(IntVTs[0], TP);
return NodeToApply->UpdateNodeType(MVT::iAny, TP);
}
case SDTCisFP: {
// If there is only one FP type supported, this must be it.
std::vector<MVT::SimpleValueType> FPVTs =
FilterVTs(CGT.getLegalValueTypes(), isFloatingPoint);
// If we found exactly one supported FP type, apply it.
if (FPVTs.size() == 1)
return NodeToApply->UpdateNodeType(FPVTs[0], TP);
return NodeToApply->UpdateNodeType(MVT::fAny, TP);
}
case SDTCisVec: {
// If there is only one vector type supported, this must be it.
std::vector<MVT::SimpleValueType> VecVTs =
FilterVTs(CGT.getLegalValueTypes(), isVector);
// If we found exactly one supported vector type, apply it.
if (VecVTs.size() == 1)
return NodeToApply->UpdateNodeType(VecVTs[0], TP);
return NodeToApply->UpdateNodeType(MVT::vAny, TP);
}
case SDTCisSameAs: {
TreePatternNode *OtherNode =
getOperandNum(x.SDTCisSameAs_Info.OtherOperandNum, N, NumResults);
return NodeToApply->UpdateNodeType(OtherNode->getExtTypes(), TP) |
OtherNode->UpdateNodeType(NodeToApply->getExtTypes(), TP);
}
case SDTCisVTSmallerThanOp: {
// The NodeToApply must be a leaf node that is a VT. OtherOperandNum must
// have an integer type that is smaller than the VT.
if (!NodeToApply->isLeaf() ||
!dynamic_cast<DefInit*>(NodeToApply->getLeafValue()) ||
!static_cast<DefInit*>(NodeToApply->getLeafValue())->getDef()
->isSubClassOf("ValueType"))
TP.error(N->getOperator()->getName() + " expects a VT operand!");
MVT::SimpleValueType VT =
getValueType(static_cast<DefInit*>(NodeToApply->getLeafValue())->getDef());
if (!isInteger(VT))
TP.error(N->getOperator()->getName() + " VT operand must be integer!");
TreePatternNode *OtherNode =
getOperandNum(x.SDTCisVTSmallerThanOp_Info.OtherOperandNum, N,NumResults);
// It must be integer.
bool MadeChange = OtherNode->UpdateNodeType(MVT::iAny, TP);
// This code only handles nodes that have one type set. Assert here so
// that we can change this if we ever need to deal with multiple value
// types at this point.
assert(OtherNode->getExtTypes().size() == 1 && "Node has too many types!");
if (OtherNode->hasTypeSet() && OtherNode->getTypeNum(0) <= VT)
OtherNode->UpdateNodeType(MVT::Other, TP); // Throw an error.
return MadeChange;
}
case SDTCisOpSmallerThanOp: {
TreePatternNode *BigOperand =
getOperandNum(x.SDTCisOpSmallerThanOp_Info.BigOperandNum, N, NumResults);
// Both operands must be integer or FP, but we don't care which.
bool MadeChange = false;
// This code does not currently handle nodes which have multiple types,
// where some types are integer, and some are fp. Assert that this is not
// the case.
assert(!(EEVT::isExtIntegerInVTs(NodeToApply->getExtTypes()) &&
EEVT::isExtFloatingPointInVTs(NodeToApply->getExtTypes())) &&
!(EEVT::isExtIntegerInVTs(BigOperand->getExtTypes()) &&
EEVT::isExtFloatingPointInVTs(BigOperand->getExtTypes())) &&
"SDTCisOpSmallerThanOp does not handle mixed int/fp types!");
if (EEVT::isExtIntegerInVTs(NodeToApply->getExtTypes()))
MadeChange |= BigOperand->UpdateNodeType(MVT::iAny, TP);
else if (EEVT::isExtFloatingPointInVTs(NodeToApply->getExtTypes()))
MadeChange |= BigOperand->UpdateNodeType(MVT::fAny, TP);
if (EEVT::isExtIntegerInVTs(BigOperand->getExtTypes()))
MadeChange |= NodeToApply->UpdateNodeType(MVT::iAny, TP);
else if (EEVT::isExtFloatingPointInVTs(BigOperand->getExtTypes()))
MadeChange |= NodeToApply->UpdateNodeType(MVT::fAny, TP);
std::vector<MVT::SimpleValueType> VTs = CGT.getLegalValueTypes();
if (EEVT::isExtIntegerInVTs(NodeToApply->getExtTypes())) {
VTs = FilterVTs(VTs, isInteger);
} else if (EEVT::isExtFloatingPointInVTs(NodeToApply->getExtTypes())) {
VTs = FilterVTs(VTs, isFloatingPoint);
} else {
VTs.clear();
}
switch (VTs.size()) {
default: // Too many VT's to pick from.
case 0: break; // No info yet.
case 1:
// Only one VT of this flavor. Cannot ever satisfy the constraints.
return NodeToApply->UpdateNodeType(MVT::Other, TP); // throw
case 2:
// If we have exactly two possible types, the little operand must be the
// small one, the big operand should be the big one. Common with
// float/double for example.
assert(VTs[0] < VTs[1] && "Should be sorted!");
MadeChange |= NodeToApply->UpdateNodeType(VTs[0], TP);
MadeChange |= BigOperand->UpdateNodeType(VTs[1], TP);
break;
}
return MadeChange;
}
case SDTCisEltOfVec: {
TreePatternNode *OtherOperand =
getOperandNum(x.SDTCisEltOfVec_Info.OtherOperandNum,
N, NumResults);
if (OtherOperand->hasTypeSet()) {
if (!isVector(OtherOperand->getTypeNum(0)))
TP.error(N->getOperator()->getName() + " VT operand must be a vector!");
EVT IVT = OtherOperand->getTypeNum(0);
IVT = IVT.getVectorElementType();
return NodeToApply->UpdateNodeType(IVT.getSimpleVT().SimpleTy, TP);
}
return false;
}
}
return false;
}
//===----------------------------------------------------------------------===//
// SDNodeInfo implementation
//
SDNodeInfo::SDNodeInfo(Record *R) : Def(R) {
EnumName = R->getValueAsString("Opcode");
SDClassName = R->getValueAsString("SDClass");
Record *TypeProfile = R->getValueAsDef("TypeProfile");
NumResults = TypeProfile->getValueAsInt("NumResults");
NumOperands = TypeProfile->getValueAsInt("NumOperands");
// Parse the properties.
Properties = 0;
std::vector<Record*> PropList = R->getValueAsListOfDefs("Properties");
for (unsigned i = 0, e = PropList.size(); i != e; ++i) {
if (PropList[i]->getName() == "SDNPCommutative") {
Properties |= 1 << SDNPCommutative;
} else if (PropList[i]->getName() == "SDNPAssociative") {
Properties |= 1 << SDNPAssociative;
} else if (PropList[i]->getName() == "SDNPHasChain") {
Properties |= 1 << SDNPHasChain;
} else if (PropList[i]->getName() == "SDNPOutFlag") {
Properties |= 1 << SDNPOutFlag;
} else if (PropList[i]->getName() == "SDNPInFlag") {
Properties |= 1 << SDNPInFlag;
} else if (PropList[i]->getName() == "SDNPOptInFlag") {
Properties |= 1 << SDNPOptInFlag;
} else if (PropList[i]->getName() == "SDNPMayStore") {
Properties |= 1 << SDNPMayStore;
} else if (PropList[i]->getName() == "SDNPMayLoad") {
Properties |= 1 << SDNPMayLoad;
} else if (PropList[i]->getName() == "SDNPSideEffect") {
Properties |= 1 << SDNPSideEffect;
} else if (PropList[i]->getName() == "SDNPMemOperand") {
Properties |= 1 << SDNPMemOperand;
} else {
errs() << "Unknown SD Node property '" << PropList[i]->getName()
<< "' on node '" << R->getName() << "'!\n";
exit(1);
}
}
// Parse the type constraints.
std::vector<Record*> ConstraintList =
TypeProfile->getValueAsListOfDefs("Constraints");
TypeConstraints.assign(ConstraintList.begin(), ConstraintList.end());
}
//===----------------------------------------------------------------------===//
// TreePatternNode implementation
//
TreePatternNode::~TreePatternNode() {
#if 0 // FIXME: implement refcounted tree nodes!
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
delete getChild(i);
#endif
}
/// 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 TreePatternNode::UpdateNodeType(const std::vector<unsigned char> &ExtVTs,
TreePattern &TP) {
assert(!ExtVTs.empty() && "Cannot update node type with empty type vector!");
if (ExtVTs[0] == EEVT::isUnknown || LHSIsSubsetOfRHS(getExtTypes(), ExtVTs))
return false;
if (isTypeCompletelyUnknown() || LHSIsSubsetOfRHS(ExtVTs, getExtTypes())) {
setTypes(ExtVTs);
return true;
}
if (getExtTypeNum(0) == MVT::iPTR || getExtTypeNum(0) == MVT::iPTRAny) {
if (ExtVTs[0] == MVT::iPTR || ExtVTs[0] == MVT::iPTRAny ||
ExtVTs[0] == MVT::iAny)
return false;
if (EEVT::isExtIntegerInVTs(ExtVTs)) {
std::vector<unsigned char> FVTs = FilterEVTs(ExtVTs, isInteger);
if (FVTs.size()) {
setTypes(ExtVTs);
return true;
}
}
}
// Merge vAny with iAny/fAny. The latter include vector types so keep them
// as the more specific information.
if (ExtVTs[0] == MVT::vAny &&
(getExtTypeNum(0) == MVT::iAny || getExtTypeNum(0) == MVT::fAny))
return false;
if (getExtTypeNum(0) == MVT::vAny &&
(ExtVTs[0] == MVT::iAny || ExtVTs[0] == MVT::fAny)) {
setTypes(ExtVTs);
return true;
}
if (ExtVTs[0] == MVT::iAny &&
EEVT::isExtIntegerInVTs(getExtTypes())) {
assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs = FilterEVTs(getExtTypes(), isInteger);
if (getExtTypes() == FVTs)
return false;
setTypes(FVTs);
return true;
}
if ((ExtVTs[0] == MVT::iPTR || ExtVTs[0] == MVT::iPTRAny) &&
EEVT::isExtIntegerInVTs(getExtTypes())) {
//assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs = FilterEVTs(getExtTypes(), isInteger);
if (getExtTypes() == FVTs)
return false;
if (FVTs.size()) {
setTypes(FVTs);
return true;
}
}
if (ExtVTs[0] == MVT::fAny &&
EEVT::isExtFloatingPointInVTs(getExtTypes())) {
assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs =
FilterEVTs(getExtTypes(), isFloatingPoint);
if (getExtTypes() == FVTs)
return false;
setTypes(FVTs);
return true;
}
if (ExtVTs[0] == MVT::vAny &&
EEVT::isExtVectorInVTs(getExtTypes())) {
assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs = FilterEVTs(getExtTypes(), isVector);
if (getExtTypes() == FVTs)
return false;
setTypes(FVTs);
return true;
}
// If we know this is an int, FP, or vector type, and we are told it is a
// specific one, take the advice.
//
// Similarly, we should probably set the type here to the intersection of
// {iAny|fAny|vAny} and ExtVTs
if ((getExtTypeNum(0) == MVT::iAny &&
EEVT::isExtIntegerInVTs(ExtVTs)) ||
(getExtTypeNum(0) == MVT::fAny &&
EEVT::isExtFloatingPointInVTs(ExtVTs)) ||
(getExtTypeNum(0) == MVT::vAny &&
EEVT::isExtVectorInVTs(ExtVTs))) {
setTypes(ExtVTs);
return true;
}
if (getExtTypeNum(0) == MVT::iAny &&
(ExtVTs[0] == MVT::iPTR || ExtVTs[0] == MVT::iPTRAny)) {
setTypes(ExtVTs);
return true;
}
if (isLeaf()) {
dump();
errs() << " ";
TP.error("Type inference contradiction found in node!");
} else {
TP.error("Type inference contradiction found in node " +
getOperator()->getName() + "!");
}
return true; // unreachable
}
static std::string GetTypeName(unsigned char TypeID) {
switch (TypeID) {
case MVT::Other: return "Other";
case MVT::iAny: return "iAny";
case MVT::fAny: return "fAny";
case MVT::vAny: return "vAny";
case EEVT::isUnknown: return "isUnknown";
case MVT::iPTR: return "iPTR";
case MVT::iPTRAny: return "iPTRAny";
default:
std::string VTName = llvm::getName((MVT::SimpleValueType)TypeID);
// Strip off EVT:: prefix if present.
if (VTName.substr(0,5) == "MVT::")
VTName = VTName.substr(5);
return VTName;
}
}
void TreePatternNode::print(raw_ostream &OS) const {
if (isLeaf()) {
OS << *getLeafValue();
} else {
OS << '(' << getOperator()->getName();
}
// FIXME: At some point we should handle printing all the value types for
// nodes that are multiply typed.
if (getExtTypeNum(0) != EEVT::isUnknown)
OS << ':' << GetTypeName(getExtTypeNum(0));
if (!isLeaf()) {
if (getNumChildren() != 0) {
OS << " ";
getChild(0)->print(OS);
for (unsigned i = 1, e = getNumChildren(); i != e; ++i) {
OS << ", ";
getChild(i)->print(OS);
}
}
OS << ")";
}
for (unsigned i = 0, e = PredicateFns.size(); i != e; ++i)
OS << "<<P:" << PredicateFns[i] << ">>";
if (TransformFn)
OS << "<<X:" << TransformFn->getName() << ">>";
if (!getName().empty())
OS << ":$" << getName();
}
void TreePatternNode::dump() const {
print(errs());
}
/// isIsomorphicTo - Return true if this node is recursively
/// isomorphic to the specified node. For this comparison, the node's
/// entire state is considered. The assigned name is ignored, since
/// nodes with differing names are considered isomorphic. However, if
/// the assigned name is present in the dependent variable set, then
/// the assigned name is considered significant and the node is
/// isomorphic if the names match.
bool TreePatternNode::isIsomorphicTo(const TreePatternNode *N,
const MultipleUseVarSet &DepVars) const {
if (N == this) return true;
if (N->isLeaf() != isLeaf() || getExtTypes() != N->getExtTypes() ||
getPredicateFns() != N->getPredicateFns() ||
getTransformFn() != N->getTransformFn())
return false;
if (isLeaf()) {
if (DefInit *DI = dynamic_cast<DefInit*>(getLeafValue())) {
if (DefInit *NDI = dynamic_cast<DefInit*>(N->getLeafValue())) {
return ((DI->getDef() == NDI->getDef())
&& (DepVars.find(getName()) == DepVars.end()
|| getName() == N->getName()));
}
}
return getLeafValue() == N->getLeafValue();
}
if (N->getOperator() != getOperator() ||
N->getNumChildren() != getNumChildren()) return false;
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
if (!getChild(i)->isIsomorphicTo(N->getChild(i), DepVars))
return false;
return true;
}
/// clone - Make a copy of this tree and all of its children.
///
TreePatternNode *TreePatternNode::clone() const {
TreePatternNode *New;
if (isLeaf()) {
New = new TreePatternNode(getLeafValue());
} else {
std::vector<TreePatternNode*> CChildren;
CChildren.reserve(Children.size());
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
CChildren.push_back(getChild(i)->clone());
New = new TreePatternNode(getOperator(), CChildren);
}
New->setName(getName());
New->setTypes(getExtTypes());
New->setPredicateFns(getPredicateFns());
New->setTransformFn(getTransformFn());
return New;
}
/// RemoveAllTypes - Recursively strip all the types of this tree.
void TreePatternNode::RemoveAllTypes() {
removeTypes();
if (isLeaf()) return;
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
getChild(i)->RemoveAllTypes();
}
/// SubstituteFormalArguments - Replace the formal arguments in this tree
/// with actual values specified by ArgMap.
void TreePatternNode::
SubstituteFormalArguments(std::map<std::string, TreePatternNode*> &ArgMap) {
if (isLeaf()) return;
for (unsigned i = 0, e = getNumChildren(); i != e; ++i) {
TreePatternNode *Child = getChild(i);
if (Child->isLeaf()) {
Init *Val = Child->getLeafValue();
if (dynamic_cast<DefInit*>(Val) &&
static_cast<DefInit*>(Val)->getDef()->getName() == "node") {
// We found a use of a formal argument, replace it with its value.
TreePatternNode *NewChild = ArgMap[Child->getName()];
assert(NewChild && "Couldn't find formal argument!");
assert((Child->getPredicateFns().empty() ||
NewChild->getPredicateFns() == Child->getPredicateFns()) &&
"Non-empty child predicate clobbered!");
setChild(i, NewChild);
}
} else {
getChild(i)->SubstituteFormalArguments(ArgMap);
}
}
}
/// InlinePatternFragments - If this pattern refers to any pattern
/// fragments, inline them into place, giving us a pattern without any
/// PatFrag references.
TreePatternNode *TreePatternNode::InlinePatternFragments(TreePattern &TP) {
if (isLeaf()) return this; // nothing to do.
Record *Op = getOperator();
if (!Op->isSubClassOf("PatFrag")) {
// Just recursively inline children nodes.
for (unsigned i = 0, e = getNumChildren(); i != e; ++i) {
TreePatternNode *Child = getChild(i);
TreePatternNode *NewChild = Child->InlinePatternFragments(TP);
assert((Child->getPredicateFns().empty() ||
NewChild->getPredicateFns() == Child->getPredicateFns()) &&
"Non-empty child predicate clobbered!");
setChild(i, NewChild);
}
return this;
}
// Otherwise, we found a reference to a fragment. First, look up its
// TreePattern record.
TreePattern *Frag = TP.getDAGPatterns().getPatternFragment(Op);
// Verify that we are passing the right number of operands.
if (Frag->getNumArgs() != Children.size())
TP.error("'" + Op->getName() + "' fragment requires " +
utostr(Frag->getNumArgs()) + " operands!");
TreePatternNode *FragTree = Frag->getOnlyTree()->clone();
std::string Code = Op->getValueAsCode("Predicate");
if (!Code.empty())
FragTree->addPredicateFn("Predicate_"+Op->getName());
// Resolve formal arguments to their actual value.
if (Frag->getNumArgs()) {
// Compute the map of formal to actual arguments.
std::map<std::string, TreePatternNode*> ArgMap;
for (unsigned i = 0, e = Frag->getNumArgs(); i != e; ++i)
ArgMap[Frag->getArgName(i)] = getChild(i)->InlinePatternFragments(TP);
FragTree->SubstituteFormalArguments(ArgMap);
}
FragTree->setName(getName());
FragTree->UpdateNodeType(getExtTypes(), TP);
// Transfer in the old predicates.
for (unsigned i = 0, e = getPredicateFns().size(); i != e; ++i)
FragTree->addPredicateFn(getPredicateFns()[i]);
// Get a new copy of this fragment to stitch into here.
//delete this; // FIXME: implement refcounting!
// The fragment we inlined could have recursive inlining that is needed. See
// if there are any pattern fragments in it and inline them as needed.
return FragTree->InlinePatternFragments(TP);
}
/// getImplicitType - Check to see if the specified record has an implicit
/// type which should be applied to it. This will infer the type of register
/// references from the register file information, for example.
///
static std::vector<unsigned char> getImplicitType(Record *R, bool NotRegisters,
TreePattern &TP) {
// Some common return values
std::vector<unsigned char> Unknown(1, EEVT::isUnknown);
std::vector<unsigned char> Other(1, MVT::Other);
// Check to see if this is a register or a register class...
if (R->isSubClassOf("RegisterClass")) {
if (NotRegisters)
return Unknown;
const CodeGenRegisterClass &RC =
TP.getDAGPatterns().getTargetInfo().getRegisterClass(R);
return ConvertVTs(RC.getValueTypes());
} else if (R->isSubClassOf("PatFrag")) {
// Pattern fragment types will be resolved when they are inlined.
return Unknown;
} else if (R->isSubClassOf("Register")) {
if (NotRegisters)
return Unknown;
const CodeGenTarget &T = TP.getDAGPatterns().getTargetInfo();
return T.getRegisterVTs(R);
} else if (R->isSubClassOf("ValueType") || R->isSubClassOf("CondCode")) {
// Using a VTSDNode or CondCodeSDNode.
return Other;
} else if (R->isSubClassOf("ComplexPattern")) {
if (NotRegisters)
return Unknown;
std::vector<unsigned char>
ComplexPat(1, TP.getDAGPatterns().getComplexPattern(R).getValueType());
return ComplexPat;
} else if (R->isSubClassOf("PointerLikeRegClass")) {
Other[0] = MVT::iPTR;
return Other;
} else if (R->getName() == "node" || R->getName() == "srcvalue" ||
R->getName() == "zero_reg") {
// Placeholder.
return Unknown;
}
TP.error("Unknown node flavor used in pattern: " + R->getName());
return Other;
}
/// getIntrinsicInfo - If this node corresponds to an intrinsic, return the
/// CodeGenIntrinsic information for it, otherwise return a null pointer.
const CodeGenIntrinsic *TreePatternNode::
getIntrinsicInfo(const CodeGenDAGPatterns &CDP) const {
if (getOperator() != CDP.get_intrinsic_void_sdnode() &&
getOperator() != CDP.get_intrinsic_w_chain_sdnode() &&
getOperator() != CDP.get_intrinsic_wo_chain_sdnode())
return 0;
unsigned IID =
dynamic_cast<IntInit*>(getChild(0)->getLeafValue())->getValue();
return &CDP.getIntrinsicInfo(IID);
}
/// getComplexPatternInfo - If this node corresponds to a ComplexPattern,
/// return the ComplexPattern information, otherwise return null.
const ComplexPattern *
TreePatternNode::getComplexPatternInfo(const CodeGenDAGPatterns &CGP) const {
if (!isLeaf()) return 0;
DefInit *DI = dynamic_cast<DefInit*>(getLeafValue());
if (DI && DI->getDef()->isSubClassOf("ComplexPattern"))
return &CGP.getComplexPattern(DI->getDef());
return 0;
}
/// NodeHasProperty - Return true if this node has the specified property.
bool TreePatternNode::NodeHasProperty(SDNP Property,
const CodeGenDAGPatterns &CGP) const {
if (isLeaf()) {
if (const ComplexPattern *CP = getComplexPatternInfo(CGP))
return CP->hasProperty(Property);
return false;
}
Record *Operator = getOperator();
if (!Operator->isSubClassOf("SDNode")) return false;
return CGP.getSDNodeInfo(Operator).hasProperty(Property);
}
/// TreeHasProperty - Return true if any node in this tree has the specified
/// property.
bool TreePatternNode::TreeHasProperty(SDNP Property,
const CodeGenDAGPatterns &CGP) const {
if (NodeHasProperty(Property, CGP))
return true;
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
if (getChild(i)->TreeHasProperty(Property, CGP))
return true;
return false;
}
/// isCommutativeIntrinsic - Return true if the node corresponds to a
/// commutative intrinsic.
bool
TreePatternNode::isCommutativeIntrinsic(const CodeGenDAGPatterns &CDP) const {
if (const CodeGenIntrinsic *Int = getIntrinsicInfo(CDP))
return Int->isCommutative;
return false;
}
/// ApplyTypeConstraints - Apply all of the type constraints relevant to
/// this node and its children in the tree. This returns true if it makes a
/// change, false otherwise. If a type contradiction is found, throw an
/// exception.
bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
CodeGenDAGPatterns &CDP = TP.getDAGPatterns();
if (isLeaf()) {
if (DefInit *DI = dynamic_cast<DefInit*>(getLeafValue())) {
// If it's a regclass or something else known, include the type.
return UpdateNodeType(getImplicitType(DI->getDef(), NotRegisters, TP),TP);
}
if (IntInit *II = dynamic_cast<IntInit*>(getLeafValue())) {
// Int inits are always integers. :)
bool MadeChange = UpdateNodeType(MVT::iAny, TP);
if (hasTypeSet()) {
// At some point, it may make sense for this tree pattern to have
// multiple types. Assert here that it does not, so we revisit this
// code when appropriate.
assert(getExtTypes().size() >= 1 && "TreePattern doesn't have a type!");
MVT::SimpleValueType VT = getTypeNum(0);
for (unsigned i = 1, e = getExtTypes().size(); i != e; ++i)
assert(getTypeNum(i) == VT && "TreePattern has too many types!");
VT = getTypeNum(0);
if (VT != MVT::iPTR && VT != MVT::iPTRAny) {
unsigned Size = EVT(VT).getSizeInBits();
// Make sure that the value is representable for this type.
if (Size < 32) {
int Val = (II->getValue() << (32-Size)) >> (32-Size);
if (Val != II->getValue()) {
// If sign-extended doesn't fit, does it fit as unsigned?
unsigned ValueMask;
unsigned UnsignedVal;
ValueMask = unsigned(~uint32_t(0UL) >> (32-Size));
UnsignedVal = unsigned(II->getValue());
if ((ValueMask & UnsignedVal) != UnsignedVal) {
TP.error("Integer value '" + itostr(II->getValue())+
"' is out of range for type '" +
getEnumName(getTypeNum(0)) + "'!");
}
}
}
}
}
return MadeChange;
}
return false;
}
// special handling for set, which isn't really an SDNode.
if (getOperator()->getName() == "set") {
assert (getNumChildren() >= 2 && "Missing RHS of a set?");
unsigned NC = getNumChildren();
bool MadeChange = false;
for (unsigned i = 0; i < NC-1; ++i) {
MadeChange = getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
MadeChange |= getChild(NC-1)->ApplyTypeConstraints(TP, NotRegisters);
// Types of operands must match.
MadeChange |= getChild(i)->UpdateNodeType(getChild(NC-1)->getExtTypes(),
TP);
MadeChange |= getChild(NC-1)->UpdateNodeType(getChild(i)->getExtTypes(),
TP);
MadeChange |= UpdateNodeType(MVT::isVoid, TP);
}
return MadeChange;
}
if (getOperator()->getName() == "implicit" ||
getOperator()->getName() == "parallel") {
bool MadeChange = false;
for (unsigned i = 0; i < getNumChildren(); ++i)
MadeChange = getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
MadeChange |= UpdateNodeType(MVT::isVoid, TP);
return MadeChange;
}
if (getOperator()->getName() == "COPY_TO_REGCLASS") {
bool MadeChange = false;
MadeChange |= getChild(0)->ApplyTypeConstraints(TP, NotRegisters);
MadeChange |= getChild(1)->ApplyTypeConstraints(TP, NotRegisters);
return MadeChange;
}
if (const CodeGenIntrinsic *Int = getIntrinsicInfo(CDP)) {
bool MadeChange = false;
// Apply the result type to the node.
unsigned NumRetVTs = Int->IS.RetVTs.size();
unsigned NumParamVTs = Int->IS.ParamVTs.size();
for (unsigned i = 0, e = NumRetVTs; i != e; ++i)
MadeChange |= UpdateNodeType(Int->IS.RetVTs[i], TP);
if (getNumChildren() != NumParamVTs + NumRetVTs)
TP.error("Intrinsic '" + Int->Name + "' expects " +
utostr(NumParamVTs + NumRetVTs - 1) + " operands, not " +
utostr(getNumChildren() - 1) + " operands!");
// Apply type info to the intrinsic ID.
MadeChange |= getChild(0)->UpdateNodeType(MVT::iPTR, TP);
for (unsigned i = NumRetVTs, e = getNumChildren(); i != e; ++i) {
MVT::SimpleValueType OpVT = Int->IS.ParamVTs[i - NumRetVTs];
MadeChange |= getChild(i)->UpdateNodeType(OpVT, TP);
MadeChange |= getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
}
return MadeChange;
}
if (getOperator()->isSubClassOf("SDNode")) {
const SDNodeInfo &NI = CDP.getSDNodeInfo(getOperator());
bool MadeChange = NI.ApplyTypeConstraints(this, TP);
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
MadeChange |= getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
// Branch, etc. do not produce results and top-level forms in instr pattern
// must have void types.
if (NI.getNumResults() == 0)
MadeChange |= UpdateNodeType(MVT::isVoid, TP);
return MadeChange;
}
if (getOperator()->isSubClassOf("Instruction")) {
const DAGInstruction &Inst = CDP.getInstruction(getOperator());
bool MadeChange = false;
unsigned NumResults = Inst.getNumResults();
assert(NumResults <= 1 &&
"Only supports zero or one result instrs!");
CodeGenInstruction &InstInfo =
CDP.getTargetInfo().getInstruction(getOperator()->getName());
// Apply the result type to the node
if (NumResults == 0 || InstInfo.NumDefs == 0) {
MadeChange = UpdateNodeType(MVT::isVoid, TP);
} else {
Record *ResultNode = Inst.getResult(0);
if (ResultNode->isSubClassOf("PointerLikeRegClass")) {
std::vector<unsigned char> VT;
VT.push_back(MVT::iPTR);
MadeChange = UpdateNodeType(VT, TP);
} else if (ResultNode->getName() == "unknown") {
std::vector<unsigned char> VT;
VT.push_back(EEVT::isUnknown);
MadeChange = UpdateNodeType(VT, TP);
} else {
assert(ResultNode->isSubClassOf("RegisterClass") &&
"Operands should be register classes!");
const CodeGenRegisterClass &RC =
CDP.getTargetInfo().getRegisterClass(ResultNode);
MadeChange = UpdateNodeType(ConvertVTs(RC.getValueTypes()), TP);
}
}
unsigned ChildNo = 0;
for (unsigned i = 0, e = Inst.getNumOperands(); i != e; ++i) {
Record *OperandNode = Inst.getOperand(i);
// If the instruction expects a predicate or optional def operand, we
// codegen this by setting the operand to it's default value if it has a
// non-empty DefaultOps field.
if ((OperandNode->isSubClassOf("PredicateOperand") ||
OperandNode->isSubClassOf("OptionalDefOperand")) &&
!CDP.getDefaultOperand(OperandNode).DefaultOps.empty())
continue;
// Verify that we didn't run out of provided operands.
if (ChildNo >= getNumChildren())
TP.error("Instruction '" + getOperator()->getName() +
"' expects more operands than were provided.");
MVT::SimpleValueType VT;
TreePatternNode *Child = getChild(ChildNo++);
if (OperandNode->isSubClassOf("RegisterClass")) {
const CodeGenRegisterClass &RC =
CDP.getTargetInfo().getRegisterClass(OperandNode);
MadeChange |= Child->UpdateNodeType(ConvertVTs(RC.getValueTypes()), TP);
} else if (OperandNode->isSubClassOf("Operand")) {
VT = getValueType(OperandNode->getValueAsDef("Type"));
MadeChange |= Child->UpdateNodeType(VT, TP);
} else if (OperandNode->isSubClassOf("PointerLikeRegClass")) {
MadeChange |= Child->UpdateNodeType(MVT::iPTR, TP);
} else if (OperandNode->getName() == "unknown") {
MadeChange |= Child->UpdateNodeType(EEVT::isUnknown, TP);
} else {
assert(0 && "Unknown operand type!");
abort();
}
MadeChange |= Child->ApplyTypeConstraints(TP, NotRegisters);
}
if (ChildNo != getNumChildren())
TP.error("Instruction '" + getOperator()->getName() +
"' was provided too many operands!");
return MadeChange;
}
assert(getOperator()->isSubClassOf("SDNodeXForm") && "Unknown node type!");
// Node transforms always take one operand.
if (getNumChildren() != 1)
TP.error("Node transform '" + getOperator()->getName() +
"' requires one operand!");
// If either the output or input of the xform does not have exact
// type info. We assume they must be the same. Otherwise, it is perfectly
// legal to transform from one type to a completely different type.
if (!hasTypeSet() || !getChild(0)->hasTypeSet()) {
bool MadeChange = UpdateNodeType(getChild(0)->getExtTypes(), TP);
MadeChange |= getChild(0)->UpdateNodeType(getExtTypes(), TP);
return MadeChange;
}
return false;
}
/// OnlyOnRHSOfCommutative - Return true if this value is only allowed on the
/// RHS of a commutative operation, not the on LHS.
static bool OnlyOnRHSOfCommutative(TreePatternNode *N) {
if (!N->isLeaf() && N->getOperator()->getName() == "imm")
return true;
if (N->isLeaf() && dynamic_cast<IntInit*>(N->getLeafValue()))
return true;
return false;
}
/// canPatternMatch - If it is impossible for this pattern to match on this
/// target, fill in Reason and return false. Otherwise, return true. This is
/// used as a sanity check for .td files (to prevent people from writing stuff
/// that can never possibly work), and to prevent the pattern permuter from
/// generating stuff that is useless.
bool TreePatternNode::canPatternMatch(std::string &Reason,
const CodeGenDAGPatterns &CDP) {
if (isLeaf()) return true;
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
if (!getChild(i)->canPatternMatch(Reason, CDP))
return false;
// If this is an intrinsic, handle cases that would make it not match. For
// example, if an operand is required to be an immediate.
if (getOperator()->isSubClassOf("Intrinsic")) {
// TODO:
return true;
}
// If this node is a commutative operator, check that the LHS isn't an
// immediate.
const SDNodeInfo &NodeInfo = CDP.getSDNodeInfo(getOperator());
bool isCommIntrinsic = isCommutativeIntrinsic(CDP);
if (NodeInfo.hasProperty(SDNPCommutative) || isCommIntrinsic) {
// Scan all of the operands of the node and make sure that only the last one
// is a constant node, unless the RHS also is.
if (!OnlyOnRHSOfCommutative(getChild(getNumChildren()-1))) {
bool Skip = isCommIntrinsic ? 1 : 0; // First operand is intrinsic id.
for (unsigned i = Skip, e = getNumChildren()-1; i != e; ++i)
if (OnlyOnRHSOfCommutative(getChild(i))) {
Reason="Immediate value must be on the RHS of commutative operators!";
return false;
}
}
}
return true;
}
//===----------------------------------------------------------------------===//
// TreePattern implementation
//
TreePattern::TreePattern(Record *TheRec, ListInit *RawPat, bool isInput,
CodeGenDAGPatterns &cdp) : TheRecord(TheRec), CDP(cdp){
isInputPattern = isInput;
for (unsigned i = 0, e = RawPat->getSize(); i != e; ++i)
Trees.push_back(ParseTreePattern((DagInit*)RawPat->getElement(i)));
}
TreePattern::TreePattern(Record *TheRec, DagInit *Pat, bool isInput,
CodeGenDAGPatterns &cdp) : TheRecord(TheRec), CDP(cdp){
isInputPattern = isInput;
Trees.push_back(ParseTreePattern(Pat));
}
TreePattern::TreePattern(Record *TheRec, TreePatternNode *Pat, bool isInput,
CodeGenDAGPatterns &cdp) : TheRecord(TheRec), CDP(cdp){
isInputPattern = isInput;
Trees.push_back(Pat);
}
void TreePattern::error(const std::string &Msg) const {
dump();
throw TGError(TheRecord->getLoc(), "In " + TheRecord->getName() + ": " + Msg);
}
TreePatternNode *TreePattern::ParseTreePattern(DagInit *Dag) {
DefInit *OpDef = dynamic_cast<DefInit*>(Dag->getOperator());
if (!OpDef) error("Pattern has unexpected operator type!");
Record *Operator = OpDef->getDef();
if (Operator->isSubClassOf("ValueType")) {
// If the operator is a ValueType, then this must be "type cast" of a leaf
// node.
if (Dag->getNumArgs() != 1)
error("Type cast only takes one operand!");
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(DI, "",
std::vector<std::pair<Init*, std::string> >()));
return ParseTreePattern(Dag);
}
New = new TreePatternNode(DI);
} else if (DagInit *DI = dynamic_cast<DagInit*>(Arg)) {
New = ParseTreePattern(DI);
} else if (IntInit *II = dynamic_cast<IntInit*>(Arg)) {
New = new TreePatternNode(II);
if (!Dag->getArgName(0).empty())
error("Constant int argument should not have a name!");
} else if (BitsInit *BI = dynamic_cast<BitsInit*>(Arg)) {
// Turn this into an IntInit.
Init *II = BI->convertInitializerTo(new IntRecTy());
if (II == 0 || !dynamic_cast<IntInit*>(II))
error("Bits value must be constants!");
New = new TreePatternNode(dynamic_cast<IntInit*>(II));
if (!Dag->getArgName(0).empty())
error("Constant int argument should not have a name!");
} else {
Arg->dump();
error("Unknown leaf value for tree pattern!");
return 0;
}
// Apply the type cast.
New->UpdateNodeType(getValueType(Operator), *this);
if (New->getNumChildren() == 0)
New->setName(Dag->getArgName(0));
return New;
}
// Verify that this is something that makes sense for an operator.
if (!Operator->isSubClassOf("PatFrag") &&
!Operator->isSubClassOf("SDNode") &&
!Operator->isSubClassOf("Instruction") &&
!Operator->isSubClassOf("SDNodeXForm") &&
!Operator->isSubClassOf("Intrinsic") &&
Operator->getName() != "set" &&
Operator->getName() != "implicit" &&
Operator->getName() != "parallel")
error("Unrecognized node '" + Operator->getName() + "'!");
// Check to see if this is something that is illegal in an input pattern.
if (isInputPattern && (Operator->isSubClassOf("Instruction") ||
Operator->isSubClassOf("SDNodeXForm")))
error("Cannot use '" + Operator->getName() + "' in an input pattern!");
std::vector<TreePatternNode*> Children;
for (unsigned i = 0, e = Dag->getNumArgs(); i != e; ++i) {
Init *Arg = Dag->getArg(i);
if (DagInit *DI = dynamic_cast<DagInit*>(Arg)) {
Children.push_back(ParseTreePattern(DI));
if (Children.back()->getName().empty())
Children.back()->setName(Dag->getArgName(i));
} else if (DefInit *DefI = dynamic_cast<DefInit*>(Arg)) {
Record *R = DefI->getDef();
// Direct reference to a leaf DagNode or PatFrag? Turn it into a
// TreePatternNode if its own.
if (R->isSubClassOf("SDNode") || R->isSubClassOf("PatFrag")) {
Dag->setArg(i, new DagInit(DefI, "",
std::vector<std::pair<Init*, std::string> >()));
--i; // Revisit this node...
} else {
TreePatternNode *Node = new TreePatternNode(DefI);
Node->setName(Dag->getArgName(i));
Children.push_back(Node);
// Input argument?
if (R->getName() == "node") {
if (Dag->getArgName(i).empty())
error("'node' argument requires a name to match with operand list");
Args.push_back(Dag->getArgName(i));
}
}
} else if (IntInit *II = dynamic_cast<IntInit*>(Arg)) {
TreePatternNode *Node = new TreePatternNode(II);
if (!Dag->getArgName(i).empty())
error("Constant int argument should not have a name!");
Children.push_back(Node);
} else if (BitsInit *BI = dynamic_cast<BitsInit*>(Arg)) {
// Turn this into an IntInit.
Init *II = BI->convertInitializerTo(new IntRecTy());
if (II == 0 || !dynamic_cast<IntInit*>(II))
error("Bits value must be constants!");
TreePatternNode *Node = new TreePatternNode(dynamic_cast<IntInit*>(II));
if (!Dag->getArgName(i).empty())
error("Constant int argument should not have a name!");
Children.push_back(Node);
} else {
errs() << '"';
Arg->dump();
errs() << "\": ";
error("Unknown leaf value for tree pattern!");
}
}
// If the operator is an intrinsic, then this is just syntactic sugar for for
// (intrinsic_* <number>, ..children..). Pick the right intrinsic node, and
// convert the intrinsic name to a number.
if (Operator->isSubClassOf("Intrinsic")) {
const CodeGenIntrinsic &Int = getDAGPatterns().getIntrinsic(Operator);
unsigned IID = getDAGPatterns().getIntrinsicID(Operator)+1;
// If this intrinsic returns void, it must have side-effects and thus a
// chain.
if (Int.IS.RetVTs[0] == MVT::isVoid) {
Operator = getDAGPatterns().get_intrinsic_void_sdnode();
} else if (Int.ModRef != CodeGenIntrinsic::NoMem) {
// Has side-effects, requires chain.
Operator = getDAGPatterns().get_intrinsic_w_chain_sdnode();
} else {
// Otherwise, no chain.
Operator = getDAGPatterns().get_intrinsic_wo_chain_sdnode();
}
TreePatternNode *IIDNode = new TreePatternNode(new IntInit(IID));
Children.insert(Children.begin(), IIDNode);
}
TreePatternNode *Result = new TreePatternNode(Operator, Children);
Result->setName(Dag->getName());
return Result;
}
/// InferAllTypes - Infer/propagate as many types throughout the expression
/// patterns as possible. Return true if all types are inferred, false
/// otherwise. Throw an exception if a type contradiction is found.
bool TreePattern::InferAllTypes() {
bool MadeChange = true;
while (MadeChange) {
MadeChange = false;
for (unsigned i = 0, e = Trees.size(); i != e; ++i)
MadeChange |= Trees[i]->ApplyTypeConstraints(*this, false);
}
bool HasUnresolvedTypes = false;
for (unsigned i = 0, e = Trees.size(); i != e; ++i)
HasUnresolvedTypes |= Trees[i]->ContainsUnresolvedType();
return !HasUnresolvedTypes;
}
void TreePattern::print(raw_ostream &OS) const {
OS << getRecord()->getName();
if (!Args.empty()) {
OS << "(" << Args[0];
for (unsigned i = 1, e = Args.size(); i != e; ++i)
OS << ", " << Args[i];
OS << ")";
}
OS << ": ";
if (Trees.size() > 1)
OS << "[\n";
for (unsigned i = 0, e = Trees.size(); i != e; ++i) {
OS << "\t";
Trees[i]->print(OS);
OS << "\n";
}
if (Trees.size() > 1)
OS << "]\n";
}
void TreePattern::dump() const { print(errs()); }
//===----------------------------------------------------------------------===//
// CodeGenDAGPatterns implementation
//
// FIXME: REMOVE OSTREAM ARGUMENT
CodeGenDAGPatterns::CodeGenDAGPatterns(RecordKeeper &R) : Records(R) {
Intrinsics = LoadIntrinsics(Records, false);
TgtIntrinsics = LoadIntrinsics(Records, true);
ParseNodeInfo();
ParseNodeTransforms();
ParseComplexPatterns();
ParsePatternFragments();
ParseDefaultOperands();
ParseInstructions();
ParsePatterns();
// Generate variants. For example, commutative patterns can match
// multiple ways. Add them to PatternsToMatch as well.
GenerateVariants();
// Infer instruction flags. For example, we can detect loads,
// stores, and side effects in many cases by examining an
// instruction's pattern.
InferInstructionFlags();
}
CodeGenDAGPatterns::~CodeGenDAGPatterns() {
for (pf_iterator I = PatternFragments.begin(),
E = PatternFragments.end(); I != E; ++I)
delete I->second;
}
Record *CodeGenDAGPatterns::getSDNodeNamed(const std::string &Name) const {
Record *N = Records.getDef(Name);
if (!N || !N->isSubClassOf("SDNode")) {
errs() << "Error getting SDNode '" << Name << "'!\n";
exit(1);
}
return N;
}
// Parse all of the SDNode definitions for the target, populating SDNodes.
void CodeGenDAGPatterns::ParseNodeInfo() {
std::vector<Record*> Nodes = Records.getAllDerivedDefinitions("SDNode");
while (!Nodes.empty()) {
SDNodes.insert(std::make_pair(Nodes.back(), Nodes.back()));
Nodes.pop_back();
}
// Get the builtin intrinsic nodes.
intrinsic_void_sdnode = getSDNodeNamed("intrinsic_void");
intrinsic_w_chain_sdnode = getSDNodeNamed("intrinsic_w_chain");
intrinsic_wo_chain_sdnode = getSDNodeNamed("intrinsic_wo_chain");
}
/// ParseNodeTransforms - Parse all SDNodeXForm instances into the SDNodeXForms
/// map, and emit them to the file as functions.
void CodeGenDAGPatterns::ParseNodeTransforms() {
std::vector<Record*> Xforms = Records.getAllDerivedDefinitions("SDNodeXForm");
while (!Xforms.empty()) {
Record *XFormNode = Xforms.back();
Record *SDNode = XFormNode->getValueAsDef("Opcode");
std::string Code = XFormNode->getValueAsCode("XFormFunction");
SDNodeXForms.insert(std::make_pair(XFormNode, NodeXForm(SDNode, Code)));
Xforms.pop_back();
}
}
void CodeGenDAGPatterns::ParseComplexPatterns() {
std::vector<Record*> AMs = Records.getAllDerivedDefinitions("ComplexPattern");
while (!AMs.empty()) {
ComplexPatterns.insert(std::make_pair(AMs.back(), AMs.back()));
AMs.pop_back();
}
}
/// ParsePatternFragments - Parse all of the PatFrag definitions in the .td
/// file, building up the PatternFragments map. After we've collected them all,
/// inline fragments together as necessary, so that there are no references left
/// inside a pattern fragment to a pattern fragment.
///
void CodeGenDAGPatterns::ParsePatternFragments() {
std::vector<Record*> Fragments = Records.getAllDerivedDefinitions("PatFrag");
// First step, parse all of the fragments.
for (unsigned i = 0, e = Fragments.size(); i != e; ++i) {
DagInit *Tree = Fragments[i]->getValueAsDag("Fragment");
TreePattern *P = new TreePattern(Fragments[i], Tree, true, *this);
PatternFragments[Fragments[i]] = P;
// Validate the argument list, converting it to set, to discard duplicates.
std::vector<std::string> &Args = P->getArgList();
std::set<std::string> OperandsSet(Args.begin(), Args.end());
if (OperandsSet.count(""))
P->error("Cannot have unnamed 'node' values in pattern fragment!");
// Parse the operands list.
DagInit *OpsList = Fragments[i]->getValueAsDag("Operands");
DefInit *OpsOp = dynamic_cast<DefInit*>(OpsList->getOperator());
// Special cases: ops == outs == ins. Different names are used to
// improve readability.
if (!OpsOp ||
(OpsOp->getDef()->getName() != "ops" &&
OpsOp->getDef()->getName() != "outs" &&
OpsOp->getDef()->getName() != "ins"))
P->error("Operands list should start with '(ops ... '!");
// Copy over the arguments.
Args.clear();
for (unsigned j = 0, e = OpsList->getNumArgs(); j != e; ++j) {
if (!dynamic_cast<DefInit*>(OpsList->getArg(j)) ||
static_cast<DefInit*>(OpsList->getArg(j))->
getDef()->getName() != "node")
P->error("Operands list should all be 'node' values.");
if (OpsList->getArgName(j).empty())
P->error("Operands list should have names for each operand!");
if (!OperandsSet.count(OpsList->getArgName(j)))
P->error("'" + OpsList->getArgName(j) +
"' does not occur in pattern or was multiply specified!");
OperandsSet.erase(OpsList->getArgName(j));
Args.push_back(OpsList->getArgName(j));
}
if (!OperandsSet.empty())
P->error("Operands list does not contain an entry for operand '" +
*OperandsSet.begin() + "'!");
// If there is a code init for this fragment, keep track of the fact that
// this fragment uses it.
std::string Code = Fragments[i]->getValueAsCode("Predicate");
if (!Code.empty())
P->getOnlyTree()->addPredicateFn("Predicate_"+Fragments[i]->getName());
// If there is a node transformation corresponding to this, keep track of
// it.
Record *Transform = Fragments[i]->getValueAsDef("OperandTransform");
if (!getSDNodeTransform(Transform).second.empty()) // not noop xform?
P->getOnlyTree()->setTransformFn(Transform);
}
// Now that we've parsed all of the tree fragments, do a closure on them so
// that there are not references to PatFrags left inside of them.
for (unsigned i = 0, e = Fragments.size(); i != e; ++i) {
TreePattern *ThePat = PatternFragments[Fragments[i]];
ThePat->InlinePatternFragments();
// Infer as many types as possible. Don't worry about it if we don't infer
// all of them, some may depend on the inputs of the pattern.
try {
ThePat->InferAllTypes();
} catch (...) {
// If this pattern fragment is not supported by this target (no types can
// satisfy its constraints), just ignore it. If the bogus pattern is
// actually used by instructions, the type consistency error will be
// reported there.
}
// If debugging, print out the pattern fragment result.
DEBUG(ThePat->dump());
}
}
void CodeGenDAGPatterns::ParseDefaultOperands() {
std::vector<Record*> DefaultOps[2];
DefaultOps[0] = Records.getAllDerivedDefinitions("PredicateOperand");
DefaultOps[1] = Records.getAllDerivedDefinitions("OptionalDefOperand");
// Find some SDNode.
assert(!SDNodes.empty() && "No SDNodes parsed?");
Init *SomeSDNode = new DefInit(SDNodes.begin()->first);
for (unsigned iter = 0; iter != 2; ++iter) {
for (unsigned i = 0, e = DefaultOps[iter].size(); i != e; ++i) {
DagInit *DefaultInfo = DefaultOps[iter][i]->getValueAsDag("DefaultOps");
// Clone the DefaultInfo dag node, changing the operator from 'ops' to
// SomeSDnode so that we can parse this.
std::vector<std::pair<Init*, std::string> > Ops;
for (unsigned op = 0, e = DefaultInfo->getNumArgs(); op != e; ++op)
Ops.push_back(std::make_pair(DefaultInfo->getArg(op),
DefaultInfo->getArgName(op)));
DagInit *DI = new DagInit(SomeSDNode, "", Ops);
// Create a TreePattern to parse this.
TreePattern P(DefaultOps[iter][i], DI, false, *this);
assert(P.getNumTrees() == 1 && "This ctor can only produce one tree!");
// Copy the operands over into a DAGDefaultOperand.
DAGDefaultOperand DefaultOpInfo;
TreePatternNode *T = P.getTree(0);
for (unsigned op = 0, e = T->getNumChildren(); op != e; ++op) {
TreePatternNode *TPN = T->getChild(op);
while (TPN->ApplyTypeConstraints(P, false))
/* Resolve all types */;
if (TPN->ContainsUnresolvedType()) {
if (iter == 0)
throw "Value #" + utostr(i) + " of PredicateOperand '" +
DefaultOps[iter][i]->getName() +"' doesn't have a concrete type!";
else
throw "Value #" + utostr(i) + " of OptionalDefOperand '" +
DefaultOps[iter][i]->getName() +"' doesn't have a concrete type!";
}
DefaultOpInfo.DefaultOps.push_back(TPN);
}
// Insert it into the DefaultOperands map so we can find it later.
DefaultOperands[DefaultOps[iter][i]] = DefaultOpInfo;
}
}
}
/// HandleUse - Given "Pat" a leaf in the pattern, check to see if it is an
/// instruction input. Return true if this is a real use.
static bool HandleUse(TreePattern *I, TreePatternNode *Pat,
std::map<std::string, TreePatternNode*> &InstInputs,
std::vector<Record*> &InstImpInputs) {
// No name -> not interesting.
if (Pat->getName().empty()) {
if (Pat->isLeaf()) {
DefInit *DI = dynamic_cast<DefInit*>(Pat->getLeafValue());
if (DI && DI->getDef()->isSubClassOf("RegisterClass"))
I->error("Input " + DI->getDef()->getName() + " must be named!");
else if (DI && DI->getDef()->isSubClassOf("Register"))
InstImpInputs.push_back(DI->getDef());
}
return false;
}
Record *Rec;
if (Pat->isLeaf()) {
DefInit *DI = dynamic_cast<DefInit*>(Pat->getLeafValue());
if (!DI) I->error("Input $" + Pat->getName() + " must be an identifier!");
Rec = DI->getDef();
} else {
Rec = Pat->getOperator();
}
// SRCVALUE nodes are ignored.
if (Rec->getName() == "srcvalue")
return false;
TreePatternNode *&Slot = InstInputs[Pat->getName()];
if (!Slot) {
Slot = Pat;
return true;
}
Record *SlotRec;
if (Slot->isLeaf()) {
SlotRec = dynamic_cast<DefInit*>(Slot->getLeafValue())->getDef();
} else {
assert(Slot->getNumChildren() == 0 && "can't be a use with children!");
SlotRec = Slot->getOperator();
}
// Ensure that the inputs agree if we've already seen this input.
if (Rec != SlotRec)
I->error("All $" + Pat->getName() + " inputs must agree with each other");
if (Slot->getExtTypes() != Pat->getExtTypes())
I->error("All $" + Pat->getName() + " inputs must agree with each other");
return true;
}
/// FindPatternInputsAndOutputs - Scan the specified TreePatternNode (which is
/// part of "I", the instruction), computing the set of inputs and outputs of
/// the pattern. Report errors if we see anything naughty.
void CodeGenDAGPatterns::
FindPatternInputsAndOutputs(TreePattern *I, TreePatternNode *Pat,
std::map<std::string, TreePatternNode*> &InstInputs,
std::map<std::string, TreePatternNode*>&InstResults,
std::vector<Record*> &InstImpInputs,
std::vector<Record*> &InstImpResults) {
if (Pat->isLeaf()) {
bool isUse = HandleUse(I, Pat, InstInputs, InstImpInputs);
if (!isUse && Pat->getTransformFn())
I->error("Cannot specify a transform function for a non-input value!");
return;
}
if (Pat->getOperator()->getName() == "implicit") {
for (unsigned i = 0, e = Pat->getNumChildren(); i != e; ++i) {
TreePatternNode *Dest = Pat->getChild(i);
if (!Dest->isLeaf())
I->error("implicitly defined value should be a register!");
DefInit *Val = dynamic_cast<DefInit*>(Dest->getLeafValue());
if (!Val || !Val->getDef()->isSubClassOf("Register"))
I->error("implicitly defined value should be a register!");
InstImpResults.push_back(Val->getDef());
}
return;
}
if (Pat->getOperator()->getName() != "set") {
// If this is not a set, verify that the children nodes are not void typed,
// and recurse.
for (unsigned i = 0, e = Pat->getNumChildren(); i != e; ++i) {
if (Pat->getChild(i)->getExtTypeNum(0) == MVT::isVoid)
I->error("Cannot have void nodes inside of patterns!");
FindPatternInputsAndOutputs(I, Pat->getChild(i), InstInputs, InstResults,
InstImpInputs, InstImpResults);
}
// If this is a non-leaf node with no children, treat it basically as if
// it were a leaf. This handles nodes like (imm).
bool isUse = HandleUse(I, Pat, InstInputs, InstImpInputs);
if (!isUse && Pat->getTransformFn())
I->error("Cannot specify a transform function for a non-input value!");
return;
}
// Otherwise, this is a set, validate and collect instruction results.
if (Pat->getNumChildren() == 0)
I->error("set requires operands!");
if (Pat->getTransformFn())
I->error("Cannot specify a transform function on a set node!");
// Check the set destinations.
unsigned NumDests = Pat->getNumChildren()-1;
for (unsigned i = 0; i != NumDests; ++i) {
TreePatternNode *Dest = Pat->getChild(i);
if (!Dest->isLeaf())
I->error("set destination should be a register!");
DefInit *Val = dynamic_cast<DefInit*>(Dest->getLeafValue());
if (!Val)
I->error("set destination should be a register!");
if (Val->getDef()->isSubClassOf("RegisterClass") ||
Val->getDef()->isSubClassOf("PointerLikeRegClass")) {
if (Dest->getName().empty())
I->error("set destination must have a name!");
if (InstResults.count(Dest->getName()))
I->error("cannot set '" + Dest->getName() +"' multiple times");
InstResults[Dest->getName()] = Dest;
} else if (Val->getDef()->isSubClassOf("Register")) {
InstImpResults.push_back(Val->getDef());
} else {
I->error("set destination should be a register!");
}
}
// Verify and collect info from the computation.
FindPatternInputsAndOutputs(I, Pat->getChild(NumDests),
InstInputs, InstResults,
InstImpInputs, InstImpResults);
}
//===----------------------------------------------------------------------===//
// Instruction Analysis
//===----------------------------------------------------------------------===//
class InstAnalyzer {
const CodeGenDAGPatterns &CDP;
bool &mayStore;
bool &mayLoad;
bool &HasSideEffects;
public:
InstAnalyzer(const CodeGenDAGPatterns &cdp,
bool &maystore, bool &mayload, bool &hse)
: CDP(cdp), mayStore(maystore), mayLoad(mayload), HasSideEffects(hse){
}
/// Analyze - Analyze the specified instruction, returning true if the
/// instruction had a pattern.
bool Analyze(Record *InstRecord) {
const TreePattern *Pattern = CDP.getInstruction(InstRecord).getPattern();
if (Pattern == 0) {
HasSideEffects = 1;
return false; // No pattern.
}
// FIXME: Assume only the first tree is the pattern. The others are clobber
// nodes.
AnalyzeNode(Pattern->getTree(0));
return true;
}
private:
void AnalyzeNode(const TreePatternNode *N) {
if (N->isLeaf()) {
if (DefInit *DI = dynamic_cast<DefInit*>(N->getLeafValue())) {
Record *LeafRec = DI->getDef();
// Handle ComplexPattern leaves.
if (LeafRec->isSubClassOf("ComplexPattern")) {
const ComplexPattern &CP = CDP.getComplexPattern(LeafRec);
if (CP.hasProperty(SDNPMayStore)) mayStore = true;
if (CP.hasProperty(SDNPMayLoad)) mayLoad = true;
if (CP.hasProperty(SDNPSideEffect)) HasSideEffects = true;
}
}
return;
}
// Analyze children.
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i)
AnalyzeNode(N->getChild(i));
// Ignore set nodes, which are not SDNodes.
if (N->getOperator()->getName() == "set")
return;
// Get information about the SDNode for the operator.
const SDNodeInfo &OpInfo = CDP.getSDNodeInfo(N->getOperator());
// Notice properties of the node.
if (OpInfo.hasProperty(SDNPMayStore)) mayStore = true;
if (OpInfo.hasProperty(SDNPMayLoad)) mayLoad = true;
if (OpInfo.hasProperty(SDNPSideEffect)) HasSideEffects = true;
if (const CodeGenIntrinsic *IntInfo = N->getIntrinsicInfo(CDP)) {
// If this is an intrinsic, analyze it.
if (IntInfo->ModRef >= CodeGenIntrinsic::ReadArgMem)
mayLoad = true;// These may load memory.
if (IntInfo->ModRef >= CodeGenIntrinsic::WriteArgMem)
mayStore = true;// Intrinsics that can write to memory are 'mayStore'.
if (IntInfo->ModRef >= CodeGenIntrinsic::WriteMem)
// WriteMem intrinsics can have other strange effects.
HasSideEffects = true;
}
}
};
static void InferFromPattern(const CodeGenInstruction &Inst,
bool &MayStore, bool &MayLoad,
bool &HasSideEffects,
const CodeGenDAGPatterns &CDP) {
MayStore = MayLoad = HasSideEffects = false;
bool HadPattern =
InstAnalyzer(CDP, MayStore, MayLoad, HasSideEffects).Analyze(Inst.TheDef);
// InstAnalyzer only correctly analyzes mayStore/mayLoad so far.
if (Inst.mayStore) { // If the .td file explicitly sets mayStore, use it.
// If we decided that this is a store from the pattern, then the .td file
// entry is redundant.
if (MayStore)
fprintf(stderr,
"Warning: mayStore flag explicitly set on instruction '%s'"
" but flag already inferred from pattern.\n",
Inst.TheDef->getName().c_str());
MayStore = true;
}
if (Inst.mayLoad) { // If the .td file explicitly sets mayLoad, use it.
// If we decided that this is a load from the pattern, then the .td file
// entry is redundant.
if (MayLoad)
fprintf(stderr,
"Warning: mayLoad flag explicitly set on instruction '%s'"
" but flag already inferred from pattern.\n",
Inst.TheDef->getName().c_str());
MayLoad = true;
}
if (Inst.neverHasSideEffects) {
if (HadPattern)
fprintf(stderr, "Warning: neverHasSideEffects set on instruction '%s' "
"which already has a pattern\n", Inst.TheDef->getName().c_str());
HasSideEffects = false;
}
if (Inst.hasSideEffects) {
if (HasSideEffects)
fprintf(stderr, "Warning: hasSideEffects set on instruction '%s' "
"which already inferred this.\n", Inst.TheDef->getName().c_str());
HasSideEffects = true;
}
}
/// ParseInstructions - Parse all of the instructions, inlining and resolving
/// any fragments involved. This populates the Instructions list with fully
/// resolved instructions.
void CodeGenDAGPatterns::ParseInstructions() {
std::vector<Record*> Instrs = Records.getAllDerivedDefinitions("Instruction");
for (unsigned i = 0, e = Instrs.size(); i != e; ++i) {
ListInit *LI = 0;
if (dynamic_cast<ListInit*>(Instrs[i]->getValueInit("Pattern")))
LI = Instrs[i]->getValueAsListInit("Pattern");
// If there is no pattern, only collect minimal information about the
// instruction for its operand list. We have to assume that there is one
// result, as we have no detailed info.
if (!LI || LI->getSize() == 0) {
std::vector<Record*> Results;
std::vector<Record*> Operands;
CodeGenInstruction &InstInfo =Target.getInstruction(Instrs[i]->getName());
if (InstInfo.OperandList.size() != 0) {
if (InstInfo.NumDefs == 0) {
// These produce no results
for (unsigned j = 0, e = InstInfo.OperandList.size(); j < e; ++j)
Operands.push_back(InstInfo.OperandList[j].Rec);
} else {
// Assume the first operand is the result.
Results.push_back(InstInfo.OperandList[0].Rec);
// The rest are inputs.
for (unsigned j = 1, e = InstInfo.OperandList.size(); j < e; ++j)
Operands.push_back(InstInfo.OperandList[j].Rec);
}
}
// Create and insert the instruction.
std::vector<Record*> ImpResults;
std::vector<Record*> ImpOperands;
Instructions.insert(std::make_pair(Instrs[i],
DAGInstruction(0, Results, Operands, ImpResults,
ImpOperands)));
continue; // no pattern.
}
// Parse the instruction.
TreePattern *I = new TreePattern(Instrs[i], LI, true, *this);
// Inline pattern fragments into it.
I->InlinePatternFragments();
// Infer as many types as possible. If we cannot infer all of them, we can
// never do anything with this instruction pattern: report it to the user.
if (!I->InferAllTypes())
I->error("Could not infer all types in pattern!");
// InstInputs - Keep track of all of the inputs of the instruction, along
// with the record they are declared as.
std::map<std::string, TreePatternNode*> InstInputs;
// InstResults - Keep track of all the virtual registers that are 'set'
// in the instruction, including what reg class they are.
std::map<std::string, TreePatternNode*> InstResults;
std::vector<Record*> InstImpInputs;
std::vector<Record*> InstImpResults;
// Verify that the top-level forms in the instruction are of void type, and
// fill in the InstResults map.
for (unsigned j = 0, e = I->getNumTrees(); j != e; ++j) {
TreePatternNode *Pat = I->getTree(j);
if (Pat->getExtTypeNum(0) != MVT::isVoid)
I->error("Top-level forms in instruction pattern should have"
" void types");
// Find inputs and outputs, and verify the structure of the uses/defs.
FindPatternInputsAndOutputs(I, Pat, InstInputs, InstResults,
InstImpInputs, InstImpResults);
}
// Now that we have inputs and outputs of the pattern, inspect the operands
// list for the instruction. This determines the order that operands are
// added to the machine instruction the node corresponds to.
unsigned NumResults = InstResults.size();
// Parse the operands list from the (ops) list, validating it.
assert(I->getArgList().empty() && "Args list should still be empty here!");
CodeGenInstruction &CGI = Target.getInstruction(Instrs[i]->getName());
// Check that all of the results occur first in the list.
std::vector<Record*> Results;
TreePatternNode *Res0Node = NULL;
for (unsigned i = 0; i != NumResults; ++i) {
if (i == CGI.OperandList.size())
I->error("'" + InstResults.begin()->first +
"' set but does not appear in operand list!");
const std::string &OpName = CGI.OperandList[i].Name;
// Check that it exists in InstResults.
TreePatternNode *RNode = InstResults[OpName];
if (RNode == 0)
I->error("Operand $" + OpName + " does not exist in operand list!");
if (i == 0)
Res0Node = RNode;
Record *R = dynamic_cast<DefInit*>(RNode->getLeafValue())->getDef();
if (R == 0)
I->error("Operand $" + OpName + " should be a set destination: all "
"outputs must occur before inputs in operand list!");
if (CGI.OperandList[i].Rec != R)
I->error("Operand $" + OpName + " class mismatch!");
// Remember the return type.
Results.push_back(CGI.OperandList[i].Rec);
// Okay, this one checks out.
InstResults.erase(OpName);
}
// Loop over the inputs next. Make a copy of InstInputs so we can destroy
// the copy while we're checking the inputs.
std::map<std::string, TreePatternNode*> InstInputsCheck(InstInputs);
std::vector<TreePatternNode*> ResultNodeOperands;
std::vector<Record*> Operands;
for (unsigned i = NumResults, e = CGI.OperandList.size(); i != e; ++i) {
CodeGenInstruction::OperandInfo &Op = CGI.OperandList[i];
const std::string &OpName = Op.Name;
if (OpName.empty())
I->error("Operand #" + utostr(i) + " in operands list has no name!");
if (!InstInputsCheck.count(OpName)) {
// If this is an predicate operand or optional def operand with an
// DefaultOps set filled in, we can ignore this. When we codegen it,
// we will do so as always executed.
if (Op.Rec->isSubClassOf("PredicateOperand") ||
Op.Rec->isSubClassOf("OptionalDefOperand")) {
// Does it have a non-empty DefaultOps field? If so, ignore this
// operand.
if (!getDefaultOperand(Op.Rec).DefaultOps.empty())
continue;
}
I->error("Operand $" + OpName +
" does not appear in the instruction pattern");
}
TreePatternNode *InVal = InstInputsCheck[OpName];
InstInputsCheck.erase(OpName); // It occurred, remove from map.
if (InVal->isLeaf() &&
dynamic_cast<DefInit*>(InVal->getLeafValue())) {
Record *InRec = static_cast<DefInit*>(InVal->getLeafValue())->getDef();
if (Op.Rec != InRec && !InRec->isSubClassOf("ComplexPattern"))
I->error("Operand $" + OpName + "'s register class disagrees"
" between the operand and pattern");
}
Operands.push_back(Op.Rec);
// Construct the result for the dest-pattern operand list.
TreePatternNode *OpNode = InVal->clone();
// No predicate is useful on the result.
OpNode->clearPredicateFns();
// Promote the xform function to be an explicit node if set.
if (Record *Xform = OpNode->getTransformFn()) {
OpNode->setTransformFn(0);
std::vector<TreePatternNode*> Children;
Children.push_back(OpNode);
OpNode = new TreePatternNode(Xform, Children);
}
ResultNodeOperands.push_back(OpNode);
}
if (!InstInputsCheck.empty())
I->error("Input operand $" + InstInputsCheck.begin()->first +
" occurs in pattern but not in operands list!");
TreePatternNode *ResultPattern =
new TreePatternNode(I->getRecord(), ResultNodeOperands);
// Copy fully inferred output node type to instruction result pattern.
if (NumResults > 0)
ResultPattern->setTypes(Res0Node->getExtTypes());
// Create and insert the instruction.
// FIXME: InstImpResults and InstImpInputs should not be part of
// DAGInstruction.
DAGInstruction TheInst(I, Results, Operands, InstImpResults, InstImpInputs);
Instructions.insert(std::make_pair(I->getRecord(), TheInst));
// Use a temporary tree pattern to infer all types and make sure that the
// constructed result is correct. This depends on the instruction already
// being inserted into the Instructions map.
TreePattern Temp(I->getRecord(), ResultPattern, false, *this);
Temp.InferAllTypes();
DAGInstruction &TheInsertedInst = Instructions.find(I->getRecord())->second;
TheInsertedInst.setResultPattern(Temp.getOnlyTree());
DEBUG(I->dump());
}
// If we can, convert the instructions to be patterns that are matched!
for (std::map<Record*, DAGInstruction, RecordPtrCmp>::iterator II =
Instructions.begin(),
E = Instructions.end(); II != E; ++II) {
DAGInstruction &TheInst = II->second;
const TreePattern *I = TheInst.getPattern();
if (I == 0) continue; // No pattern.
// FIXME: Assume only the first tree is the pattern. The others are clobber
// nodes.
TreePatternNode *Pattern = I->getTree(0);
TreePatternNode *SrcPattern;
if (Pattern->getOperator()->getName() == "set") {
SrcPattern = Pattern->getChild(Pattern->getNumChildren()-1)->clone();
} else{
// Not a set (store or something?)
SrcPattern = Pattern;
}
Record *Instr = II->first;
AddPatternToMatch(I,
PatternToMatch(Instr->getValueAsListInit("Predicates"),
SrcPattern,
TheInst.getResultPattern(),
TheInst.getImpResults(),
Instr->getValueAsInt("AddedComplexity")));
}
}
typedef std::pair<const TreePatternNode*, unsigned> NameRecord;
static void FindNames(const TreePatternNode *P,
std::map<std::string, NameRecord> &Names,
const TreePattern *PatternTop) {
if (!P->getName().empty()) {
NameRecord &Rec = Names[P->getName()];
// If this is the first instance of the name, remember the node.
if (Rec.second++ == 0)
Rec.first = P;
else if (Rec.first->getExtTypes() != P->getExtTypes())
PatternTop->error("repetition of value: $" + P->getName() +
" where different uses have different types!");
}
if (!P->isLeaf()) {
for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i)
FindNames(P->getChild(i), Names, PatternTop);
}
}
void CodeGenDAGPatterns::AddPatternToMatch(const TreePattern *Pattern,
const PatternToMatch &PTM) {
// Do some sanity checking on the pattern we're about to match.
std::string Reason;
if (!PTM.getSrcPattern()->canPatternMatch(Reason, *this))
Pattern->error("Pattern can never match: " + Reason);
// Find all of the named values in the input and output, ensure they have the
// same type.
std::map<std::string, NameRecord> SrcNames, DstNames;
FindNames(PTM.getSrcPattern(), SrcNames, Pattern);
FindNames(PTM.getDstPattern(), DstNames, Pattern);
// Scan all of the named values in the destination pattern, rejecting them if
// they don't exist in the input pattern.
for (std::map<std::string, NameRecord>::iterator
I = DstNames.begin(), E = DstNames.end(); I != E; ++I) {
if (SrcNames[I->first].first == 0)
Pattern->error("Pattern has input without matching name in output: $" +
I->first);
#if 0
const std::vector<unsigned char> &SrcTypeVec =
SrcNames[I->first].first->getExtTypes();
const std::vector<unsigned char> &DstTypeVec =
I->second.first->getExtTypes();
if (SrcTypeVec == DstTypeVec) continue;
std::string SrcType, DstType;
for (unsigned i = 0, e = SrcTypeVec.size(); i != e; ++i)
SrcType += ":" + GetTypeName(SrcTypeVec[i]);
for (unsigned i = 0, e = DstTypeVec.size(); i != e; ++i)
DstType += ":" + GetTypeName(DstTypeVec[i]);
Pattern->error("Variable $" + I->first +
" has different types in source (" + SrcType +
") and dest (" + DstType + ") pattern!");
#endif
}
// Scan all of the named values in the source pattern, rejecting them if the
// name isn't used in the dest, and isn't used to tie two values together.
for (std::map<std::string, NameRecord>::iterator
I = SrcNames.begin(), E = SrcNames.end(); I != E; ++I)
if (DstNames[I->first].first == 0 && SrcNames[I->first].second == 1)
Pattern->error("Pattern has dead named input: $" + I->first);
PatternsToMatch.push_back(PTM);
}
void CodeGenDAGPatterns::InferInstructionFlags() {
std::map<std::string, CodeGenInstruction> &InstrDescs =
Target.getInstructions();
for (std::map<std::string, CodeGenInstruction>::iterator
II = InstrDescs.begin(), E = InstrDescs.end(); II != E; ++II) {
CodeGenInstruction &InstInfo = II->second;
// Determine properties of the instruction from its pattern.
bool MayStore, MayLoad, HasSideEffects;
InferFromPattern(InstInfo, MayStore, MayLoad, HasSideEffects, *this);
InstInfo.mayStore = MayStore;
InstInfo.mayLoad = MayLoad;
InstInfo.hasSideEffects = HasSideEffects;
}
}
void CodeGenDAGPatterns::ParsePatterns() {
std::vector<Record*> Patterns = Records.getAllDerivedDefinitions("Pattern");
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
DagInit *Tree = Patterns[i]->getValueAsDag("PatternToMatch");
DefInit *OpDef = dynamic_cast<DefInit*>(Tree->getOperator());
Record *Operator = OpDef->getDef();
TreePattern *Pattern;
if (Operator->getName() != "parallel")
Pattern = new TreePattern(Patterns[i], Tree, true, *this);
else {
std::vector<Init*> Values;
RecTy *ListTy = 0;
for (unsigned j = 0, ee = Tree->getNumArgs(); j != ee; ++j) {
Values.push_back(Tree->getArg(j));
TypedInit *TArg = dynamic_cast<TypedInit*>(Tree->getArg(j));
if (TArg == 0) {
errs() << "In dag: " << Tree->getAsString();
errs() << " -- Untyped argument in pattern\n";
assert(0 && "Untyped argument in pattern");
}
if (ListTy != 0) {
ListTy = resolveTypes(ListTy, TArg->getType());
if (ListTy == 0) {
errs() << "In dag: " << Tree->getAsString();
errs() << " -- Incompatible types in pattern arguments\n";
assert(0 && "Incompatible types in pattern arguments");
}
}
else {
ListTy = TArg->getType();
}
}
ListInit *LI = new ListInit(Values, new ListRecTy(ListTy));
Pattern = new TreePattern(Patterns[i], LI, true, *this);
}
// Inline pattern fragments into it.
Pattern->InlinePatternFragments();
ListInit *LI = Patterns[i]->getValueAsListInit("ResultInstrs");
if (LI->getSize() == 0) continue; // no pattern.
// Parse the instruction.
TreePattern *Result = new TreePattern(Patterns[i], LI, false, *this);
// Inline pattern fragments into it.
Result->InlinePatternFragments();
if (Result->getNumTrees() != 1)
Result->error("Cannot handle instructions producing instructions "
"with temporaries yet!");
bool IterateInference;
bool InferredAllPatternTypes, InferredAllResultTypes;
do {
// Infer as many types as possible. If we cannot infer all of them, we
// can never do anything with this pattern: report it to the user.
InferredAllPatternTypes = Pattern->InferAllTypes();
// Infer as many types as possible. If we cannot infer all of them, we
// can never do anything with this pattern: report it to the user.
InferredAllResultTypes = Result->InferAllTypes();
// Apply the type of the result to the source pattern. This helps us
// resolve cases where the input type is known to be a pointer type (which
// is considered resolved), but the result knows it needs to be 32- or
// 64-bits. Infer the other way for good measure.
IterateInference = Pattern->getTree(0)->
UpdateNodeType(Result->getTree(0)->getExtTypes(), *Result);
IterateInference |= Result->getTree(0)->
UpdateNodeType(Pattern->getTree(0)->getExtTypes(), *Result);
} while (IterateInference);
// Verify that we inferred enough types that we can do something with the
// pattern and result. If these fire the user has to add type casts.
if (!InferredAllPatternTypes)
Pattern->error("Could not infer all types in pattern!");
if (!InferredAllResultTypes)
Result->error("Could not infer all types in pattern result!");
// Validate that the input pattern is correct.
std::map<std::string, TreePatternNode*> InstInputs;
std::map<std::string, TreePatternNode*> InstResults;
std::vector<Record*> InstImpInputs;
std::vector<Record*> InstImpResults;
for (unsigned j = 0, ee = Pattern->getNumTrees(); j != ee; ++j)
FindPatternInputsAndOutputs(Pattern, Pattern->getTree(j),
InstInputs, InstResults,
InstImpInputs, InstImpResults);
// Promote the xform function to be an explicit node if set.
TreePatternNode *DstPattern = Result->getOnlyTree();
std::vector<TreePatternNode*> ResultNodeOperands;
for (unsigned ii = 0, ee = DstPattern->getNumChildren(); ii != ee; ++ii) {
TreePatternNode *OpNode = DstPattern->getChild(ii);
if (Record *Xform = OpNode->getTransformFn()) {
OpNode->setTransformFn(0);
std::vector<TreePatternNode*> Children;
Children.push_back(OpNode);
OpNode = new TreePatternNode(Xform, Children);
}
ResultNodeOperands.push_back(OpNode);
}
DstPattern = Result->getOnlyTree();
if (!DstPattern->isLeaf())
DstPattern = new TreePatternNode(DstPattern->getOperator(),
ResultNodeOperands);
DstPattern->setTypes(Result->getOnlyTree()->getExtTypes());
TreePattern Temp(Result->getRecord(), DstPattern, false, *this);
Temp.InferAllTypes();
AddPatternToMatch(Pattern,
PatternToMatch(Patterns[i]->getValueAsListInit("Predicates"),
Pattern->getTree(0),
Temp.getOnlyTree(), InstImpResults,
Patterns[i]->getValueAsInt("AddedComplexity")));
}
}
/// CombineChildVariants - Given a bunch of permutations of each child of the
/// 'operator' node, put them together in all possible ways.
static void CombineChildVariants(TreePatternNode *Orig,
const std::vector<std::vector<TreePatternNode*> > &ChildVariants,
std::vector<TreePatternNode*> &OutVariants,
CodeGenDAGPatterns &CDP,
const MultipleUseVarSet &DepVars) {
// Make sure that each operand has at least one variant to choose from.
for (unsigned i = 0, e = ChildVariants.size(); i != e; ++i)
if (ChildVariants[i].empty())
return;
// The end result is an all-pairs construction of the resultant pattern.
std::vector<unsigned> Idxs;
Idxs.resize(ChildVariants.size());
bool NotDone;
do {
#ifndef NDEBUG
if (DebugFlag && !Idxs.empty()) {
errs() << Orig->getOperator()->getName() << ": Idxs = [ ";
for (unsigned i = 0; i < Idxs.size(); ++i) {
errs() << Idxs[i] << " ";
}
errs() << "]\n";
}
#endif
// Create the variant and add it to the output list.
std::vector<TreePatternNode*> NewChildren;
for (unsigned i = 0, e = ChildVariants.size(); i != e; ++i)
NewChildren.push_back(ChildVariants[i][Idxs[i]]);
TreePatternNode *R = new TreePatternNode(Orig->getOperator(), NewChildren);
// Copy over properties.
R->setName(Orig->getName());
R->setPredicateFns(Orig->getPredicateFns());
R->setTransformFn(Orig->getTransformFn());
R->setTypes(Orig->getExtTypes());
// If this pattern cannot match, do not include it as a variant.
std::string ErrString;
if (!R->canPatternMatch(ErrString, CDP)) {
delete R;
} else {
bool AlreadyExists = false;
// Scan to see if this pattern has already been emitted. We can get
// duplication due to things like commuting:
// (and GPRC:$a, GPRC:$b) -> (and GPRC:$b, GPRC:$a)
// which are the same pattern. Ignore the dups.
for (unsigned i = 0, e = OutVariants.size(); i != e; ++i)
if (R->isIsomorphicTo(OutVariants[i], DepVars)) {
AlreadyExists = true;
break;
}
if (AlreadyExists)
delete R;
else
OutVariants.push_back(R);
}
// Increment indices to the next permutation by incrementing the
// indicies from last index backward, e.g., generate the sequence
// [0, 0], [0, 1], [1, 0], [1, 1].
int IdxsIdx;
for (IdxsIdx = Idxs.size() - 1; IdxsIdx >= 0; --IdxsIdx) {
if (++Idxs[IdxsIdx] == ChildVariants[IdxsIdx].size())
Idxs[IdxsIdx] = 0;
else
break;
}
NotDone = (IdxsIdx >= 0);
} while (NotDone);
}
/// CombineChildVariants - A helper function for binary operators.
///
static void CombineChildVariants(TreePatternNode *Orig,
const std::vector<TreePatternNode*> &LHS,
const std::vector<TreePatternNode*> &RHS,
std::vector<TreePatternNode*> &OutVariants,
CodeGenDAGPatterns &CDP,
const MultipleUseVarSet &DepVars) {
std::vector<std::vector<TreePatternNode*> > ChildVariants;
ChildVariants.push_back(LHS);
ChildVariants.push_back(RHS);
CombineChildVariants(Orig, ChildVariants, OutVariants, CDP, DepVars);
}
static void GatherChildrenOfAssociativeOpcode(TreePatternNode *N,
std::vector<TreePatternNode *> &Children) {
assert(N->getNumChildren()==2 &&"Associative but doesn't have 2 children!");
Record *Operator = N->getOperator();
// Only permit raw nodes.
if (!N->getName().empty() || !N->getPredicateFns().empty() ||
N->getTransformFn()) {
Children.push_back(N);
return;
}
if (N->getChild(0)->isLeaf() || N->getChild(0)->getOperator() != Operator)
Children.push_back(N->getChild(0));
else
GatherChildrenOfAssociativeOpcode(N->getChild(0), Children);
if (N->getChild(1)->isLeaf() || N->getChild(1)->getOperator() != Operator)
Children.push_back(N->getChild(1));
else
GatherChildrenOfAssociativeOpcode(N->getChild(1), Children);
}
/// GenerateVariantsOf - Given a pattern N, generate all permutations we can of
/// the (potentially recursive) pattern by using algebraic laws.
///
static void GenerateVariantsOf(TreePatternNode *N,
std::vector<TreePatternNode*> &OutVariants,
CodeGenDAGPatterns &CDP,
const MultipleUseVarSet &DepVars) {
// We cannot permute leaves.
if (N->isLeaf()) {
OutVariants.push_back(N);
return;
}
// Look up interesting info about the node.
const SDNodeInfo &NodeInfo = CDP.getSDNodeInfo(N->getOperator());
// If this node is associative, re-associate.
if (NodeInfo.hasProperty(SDNPAssociative)) {
// Re-associate by pulling together all of the linked operators
std::vector<TreePatternNode*> MaximalChildren;
GatherChildrenOfAssociativeOpcode(N, MaximalChildren);
// Only handle child sizes of 3. Otherwise we'll end up trying too many
// permutations.
if (MaximalChildren.size() == 3) {
// Find the variants of all of our maximal children.
std::vector<TreePatternNode*> AVariants, BVariants, CVariants;
GenerateVariantsOf(MaximalChildren[0], AVariants, CDP, DepVars);
GenerateVariantsOf(MaximalChildren[1], BVariants, CDP, DepVars);
GenerateVariantsOf(MaximalChildren[2], CVariants, CDP, DepVars);
// There are only two ways we can permute the tree:
// (A op B) op C and A op (B op C)
// Within these forms, we can also permute A/B/C.
// Generate legal pair permutations of A/B/C.
std::vector<TreePatternNode*> ABVariants;
std::vector<TreePatternNode*> BAVariants;
std::vector<TreePatternNode*> ACVariants;
std::vector<TreePatternNode*> CAVariants;
std::vector<TreePatternNode*> BCVariants;
std::vector<TreePatternNode*> CBVariants;
CombineChildVariants(N, AVariants, BVariants, ABVariants, CDP, DepVars);
CombineChildVariants(N, BVariants, AVariants, BAVariants, CDP, DepVars);
CombineChildVariants(N, AVariants, CVariants, ACVariants, CDP, DepVars);
CombineChildVariants(N, CVariants, AVariants, CAVariants, CDP, DepVars);
CombineChildVariants(N, BVariants, CVariants, BCVariants, CDP, DepVars);
CombineChildVariants(N, CVariants, BVariants, CBVariants, CDP, DepVars);
// Combine those into the result: (x op x) op x
CombineChildVariants(N, ABVariants, CVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, BAVariants, CVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, ACVariants, BVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, CAVariants, BVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, BCVariants, AVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, CBVariants, AVariants, OutVariants, CDP, DepVars);
// Combine those into the result: x op (x op x)
CombineChildVariants(N, CVariants, ABVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, CVariants, BAVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, BVariants, ACVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, BVariants, CAVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, AVariants, BCVariants, OutVariants, CDP, DepVars);
CombineChildVariants(N, AVariants, CBVariants, OutVariants, CDP, DepVars);
return;
}
}
// Compute permutations of all children.
std::vector<std::vector<TreePatternNode*> > ChildVariants;
ChildVariants.resize(N->getNumChildren());
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i)
GenerateVariantsOf(N->getChild(i), ChildVariants[i], CDP, DepVars);
// Build all permutations based on how the children were formed.
CombineChildVariants(N, ChildVariants, OutVariants, CDP, DepVars);
// If this node is commutative, consider the commuted order.
bool isCommIntrinsic = N->isCommutativeIntrinsic(CDP);
if (NodeInfo.hasProperty(SDNPCommutative) || isCommIntrinsic) {
assert((N->getNumChildren()==2 || isCommIntrinsic) &&
"Commutative but doesn't have 2 children!");
// Don't count children which are actually register references.
unsigned NC = 0;
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i) {
TreePatternNode *Child = N->getChild(i);
if (Child->isLeaf())
if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
Record *RR = DI->getDef();
if (RR->isSubClassOf("Register"))
continue;
}
NC++;
}
// Consider the commuted order.
if (isCommIntrinsic) {
// Commutative intrinsic. First operand is the intrinsic id, 2nd and 3rd
// operands are the commutative operands, and there might be more operands
// after those.
assert(NC >= 3 &&
"Commutative intrinsic should have at least 3 childrean!");
std::vector<std::vector<TreePatternNode*> > Variants;
Variants.push_back(ChildVariants[0]); // Intrinsic id.
Variants.push_back(ChildVariants[2]);
Variants.push_back(ChildVariants[1]);
for (unsigned i = 3; i != NC; ++i)
Variants.push_back(ChildVariants[i]);
CombineChildVariants(N, Variants, OutVariants, CDP, DepVars);
} else if (NC == 2)
CombineChildVariants(N, ChildVariants[1], ChildVariants[0],
OutVariants, CDP, DepVars);
}
}
// GenerateVariants - Generate variants. For example, commutative patterns can
// match multiple ways. Add them to PatternsToMatch as well.
void CodeGenDAGPatterns::GenerateVariants() {
DEBUG(errs() << "Generating instruction variants.\n");
// Loop over all of the patterns we've collected, checking to see if we can
// generate variants of the instruction, through the exploitation of
// identities. This permits the target to provide aggressive matching without
// the .td file having to contain tons of variants of instructions.
//
// Note that this loop adds new patterns to the PatternsToMatch list, but we
// intentionally do not reconsider these. Any variants of added patterns have
// already been added.
//
for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
MultipleUseVarSet DepVars;
std::vector<TreePatternNode*> Variants;
FindDepVars(PatternsToMatch[i].getSrcPattern(), DepVars);
DEBUG(errs() << "Dependent/multiply used variables: ");
DEBUG(DumpDepVars(DepVars));
DEBUG(errs() << "\n");
GenerateVariantsOf(PatternsToMatch[i].getSrcPattern(), Variants, *this, DepVars);
assert(!Variants.empty() && "Must create at least original variant!");
Variants.erase(Variants.begin()); // Remove the original pattern.
if (Variants.empty()) // No variants for this pattern.
continue;
DEBUG(errs() << "FOUND VARIANTS OF: ";
PatternsToMatch[i].getSrcPattern()->dump();
errs() << "\n");
for (unsigned v = 0, e = Variants.size(); v != e; ++v) {
TreePatternNode *Variant = Variants[v];
DEBUG(errs() << " VAR#" << v << ": ";
Variant->dump();
errs() << "\n");
// Scan to see if an instruction or explicit pattern already matches this.
bool AlreadyExists = false;
for (unsigned p = 0, e = PatternsToMatch.size(); p != e; ++p) {
// Skip if the top level predicates do not match.
if (PatternsToMatch[i].getPredicates() !=
PatternsToMatch[p].getPredicates())
continue;
// Check to see if this variant already exists.
if (Variant->isIsomorphicTo(PatternsToMatch[p].getSrcPattern(), DepVars)) {
DEBUG(errs() << " *** ALREADY EXISTS, ignoring variant.\n");
AlreadyExists = true;
break;
}
}
// If we already have it, ignore the variant.
if (AlreadyExists) continue;
// Otherwise, add it to the list of patterns we have.
PatternsToMatch.
push_back(PatternToMatch(PatternsToMatch[i].getPredicates(),
Variant, PatternsToMatch[i].getDstPattern(),
PatternsToMatch[i].getDstRegs(),
PatternsToMatch[i].getAddedComplexity()));
}
DEBUG(errs() << "\n");
}
}
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