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llvm-mirror/utils/TableGen/DAGISelEmitter.cpp
Evan Cheng 94c6f2c3b5 Also checks for noResults field. 
llvm-svn: 29235
2006-07-20 23:36:20 +00:00

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//===- DAGISelEmitter.cpp - Generate an instruction selector --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend emits a DAG instruction selector.
//
//===----------------------------------------------------------------------===//
#include "DAGISelEmitter.h"
#include "Record.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Debug.h"
#include <algorithm>
#include <set>
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::ValueType>
FilterVTs(const std::vector<MVT::ValueType> &InVTs, T Filter) {
std::vector<MVT::ValueType> 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::ValueType)InVTs[i]))
Result.push_back(InVTs[i]);
return Result;
}
static std::vector<unsigned char>
ConvertVTs(const std::vector<MVT::ValueType> &InVTs) {
std::vector<unsigned char> Result;
for (unsigned i = 0, e = InVTs.size(); i != e; ++i)
Result.push_back(InVTs[i]);
return Result;
}
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;
}
/// isExtIntegerVT - Return true if the specified extended value type vector
/// contains isInt or an integer value type.
static bool isExtIntegerInVTs(const std::vector<unsigned char> &EVTs) {
assert(!EVTs.empty() && "Cannot check for integer in empty ExtVT list!");
return EVTs[0] == MVT::isInt || !(FilterEVTs(EVTs, MVT::isInteger).empty());
}
/// isExtFloatingPointVT - Return true if the specified extended value type
/// vector contains isFP or a FP value type.
static bool isExtFloatingPointInVTs(const std::vector<unsigned char> &EVTs) {
assert(!EVTs.empty() && "Cannot check for integer in empty ExtVT list!");
return EVTs[0] == MVT::isFP ||
!(FilterEVTs(EVTs, MVT::isFloatingPoint).empty());
}
//===----------------------------------------------------------------------===//
// 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("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("SDTCisIntVectorOfSameSize")) {
ConstraintType = SDTCisIntVectorOfSameSize;
x.SDTCisIntVectorOfSameSize_Info.OtherOperandNum =
R->getValueAsInt("OtherOpNum");
} else {
std::cerr << "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())) {
std::cerr << "Invalid operand number " << OpNo << " ";
N->dump();
std::cerr << '\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.getDAGISelEmitter().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::ValueType> IntVTs =
FilterVTs(CGT.getLegalValueTypes(), MVT::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::isInt, TP);
}
case SDTCisFP: {
// If there is only one FP type supported, this must be it.
std::vector<MVT::ValueType> FPVTs =
FilterVTs(CGT.getLegalValueTypes(), MVT::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::isFP, 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::ValueType VT =
getValueType(static_cast<DefInit*>(NodeToApply->getLeafValue())->getDef());
if (!MVT::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 = false;
MadeChange |= OtherNode->UpdateNodeType(MVT::isInt, 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 false;
}
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(!(isExtIntegerInVTs(NodeToApply->getExtTypes()) &&
isExtFloatingPointInVTs(NodeToApply->getExtTypes())) &&
!(isExtIntegerInVTs(BigOperand->getExtTypes()) &&
isExtFloatingPointInVTs(BigOperand->getExtTypes())) &&
"SDTCisOpSmallerThanOp does not handle mixed int/fp types!");
if (isExtIntegerInVTs(NodeToApply->getExtTypes()))
MadeChange |= BigOperand->UpdateNodeType(MVT::isInt, TP);
else if (isExtFloatingPointInVTs(NodeToApply->getExtTypes()))
MadeChange |= BigOperand->UpdateNodeType(MVT::isFP, TP);
if (isExtIntegerInVTs(BigOperand->getExtTypes()))
MadeChange |= NodeToApply->UpdateNodeType(MVT::isInt, TP);
else if (isExtFloatingPointInVTs(BigOperand->getExtTypes()))
MadeChange |= NodeToApply->UpdateNodeType(MVT::isFP, TP);
std::vector<MVT::ValueType> VTs = CGT.getLegalValueTypes();
if (isExtIntegerInVTs(NodeToApply->getExtTypes())) {
VTs = FilterVTs(VTs, MVT::isInteger);
} else if (isExtFloatingPointInVTs(NodeToApply->getExtTypes())) {
VTs = FilterVTs(VTs, MVT::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 satisify 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 SDTCisIntVectorOfSameSize: {
TreePatternNode *OtherOperand =
getOperandNum(x.SDTCisIntVectorOfSameSize_Info.OtherOperandNum,
N, NumResults);
if (OtherOperand->hasTypeSet()) {
if (!MVT::isVector(OtherOperand->getTypeNum(0)))
TP.error(N->getOperator()->getName() + " VT operand must be a vector!");
MVT::ValueType IVT = OtherOperand->getTypeNum(0);
IVT = MVT::getIntVectorWithNumElements(MVT::getVectorNumElements(IVT));
return NodeToApply->UpdateNodeType(IVT, 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 {
std::cerr << "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] == MVT::isUnknown || LHSIsSubsetOfRHS(getExtTypes(), ExtVTs))
return false;
if (isTypeCompletelyUnknown() || LHSIsSubsetOfRHS(ExtVTs, getExtTypes())) {
setTypes(ExtVTs);
return true;
}
if (getExtTypeNum(0) == MVT::iPTR) {
if (ExtVTs[0] == MVT::iPTR || ExtVTs[0] == MVT::isInt)
return false;
if (isExtIntegerInVTs(ExtVTs)) {
std::vector<unsigned char> FVTs = FilterEVTs(ExtVTs, MVT::isInteger);
if (FVTs.size()) {
setTypes(ExtVTs);
return true;
}
}
}
if (ExtVTs[0] == MVT::isInt && isExtIntegerInVTs(getExtTypes())) {
assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs = FilterEVTs(getExtTypes(), MVT::isInteger);
if (getExtTypes() == FVTs)
return false;
setTypes(FVTs);
return true;
}
if (ExtVTs[0] == MVT::iPTR && isExtIntegerInVTs(getExtTypes())) {
//assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs = FilterEVTs(getExtTypes(), MVT::isInteger);
if (getExtTypes() == FVTs)
return false;
if (FVTs.size()) {
setTypes(FVTs);
return true;
}
}
if (ExtVTs[0] == MVT::isFP && isExtFloatingPointInVTs(getExtTypes())) {
assert(hasTypeSet() && "should be handled above!");
std::vector<unsigned char> FVTs =
FilterEVTs(getExtTypes(), MVT::isFloatingPoint);
if (getExtTypes() == FVTs)
return false;
setTypes(FVTs);
return true;
}
// If we know this is an int or fp 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
// {isInt|isFP} and ExtVTs
if ((getExtTypeNum(0) == MVT::isInt && isExtIntegerInVTs(ExtVTs)) ||
(getExtTypeNum(0) == MVT::isFP && isExtFloatingPointInVTs(ExtVTs))) {
setTypes(ExtVTs);
return true;
}
if (getExtTypeNum(0) == MVT::isInt && ExtVTs[0] == MVT::iPTR) {
setTypes(ExtVTs);
return true;
}
if (isLeaf()) {
dump();
std::cerr << " ";
TP.error("Type inference contradiction found in node!");
} else {
TP.error("Type inference contradiction found in node " +
getOperator()->getName() + "!");
}
return true; // unreachable
}
void TreePatternNode::print(std::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.
switch (getExtTypeNum(0)) {
case MVT::Other: OS << ":Other"; break;
case MVT::isInt: OS << ":isInt"; break;
case MVT::isFP : OS << ":isFP"; break;
case MVT::isUnknown: ; /*OS << ":?";*/ break;
case MVT::iPTR: OS << ":iPTR"; break;
default: {
std::string VTName = llvm::getName(getTypeNum(0));
// Strip off MVT:: prefix if present.
if (VTName.substr(0,5) == "MVT::")
VTName = VTName.substr(5);
OS << ":" << VTName;
break;
}
}
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 << ")";
}
if (!PredicateFn.empty())
OS << "<<P:" << PredicateFn << ">>";
if (TransformFn)
OS << "<<X:" << TransformFn->getName() << ">>";
if (!getName().empty())
OS << ":$" << getName();
}
void TreePatternNode::dump() const {
print(std::cerr);
}
/// isIsomorphicTo - Return true if this node is recursively isomorphic to
/// the specified node. For this comparison, all of the state of the node
/// is considered, except for the assigned name. Nodes with differing names
/// that are otherwise identical are considered isomorphic.
bool TreePatternNode::isIsomorphicTo(const TreePatternNode *N) const {
if (N == this) return true;
if (N->isLeaf() != isLeaf() || getExtTypes() != N->getExtTypes() ||
getPredicateFn() != N->getPredicateFn() ||
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();
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)))
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->setPredicateFn(getPredicateFn());
New->setTransformFn(getTransformFn());
return New;
}
/// 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.
Child = ArgMap[Child->getName()];
assert(Child && "Couldn't find formal argument!");
setChild(i, Child);
}
} 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)
setChild(i, getChild(i)->InlinePatternFragments(TP));
return this;
}
// Otherwise, we found a reference to a fragment. First, look up its
// TreePattern record.
TreePattern *Frag = TP.getDAGISelEmitter().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();
// 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);
// Get a new copy of this fragment to stitch into here.
//delete this; // FIXME: implement refcounting!
return FragTree;
}
/// getImplicitType - Check to see if the specified record has an implicit
/// type which should be applied to it. This 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, MVT::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.getDAGISelEmitter().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.getDAGISelEmitter().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.getDAGISelEmitter().getComplexPattern(R).getValueType());
return ComplexPat;
} else if (R->getName() == "node" || R->getName() == "srcvalue") {
// Placeholder.
return Unknown;
}
TP.error("Unknown node flavor used in pattern: " + R->getName());
return Other;
}
/// ApplyTypeConstraints - Apply all of the type constraints relevent 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) {
DAGISelEmitter &ISE = TP.getDAGISelEmitter();
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);
} else if (IntInit *II = dynamic_cast<IntInit*>(getLeafValue())) {
// Int inits are always integers. :)
bool MadeChange = UpdateNodeType(MVT::isInt, 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::ValueType 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) {
unsigned Size = MVT::getSizeInBits(VT);
// 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())
TP.error("Sign-extended 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 && "Only handle 2 operand set's for now!");
bool MadeChange = getChild(0)->ApplyTypeConstraints(TP, NotRegisters);
MadeChange |= getChild(1)->ApplyTypeConstraints(TP, NotRegisters);
// Types of operands must match.
MadeChange |= getChild(0)->UpdateNodeType(getChild(1)->getExtTypes(), TP);
MadeChange |= getChild(1)->UpdateNodeType(getChild(0)->getExtTypes(), TP);
MadeChange |= UpdateNodeType(MVT::isVoid, TP);
return MadeChange;
} else if (getOperator() == ISE.get_intrinsic_void_sdnode() ||
getOperator() == ISE.get_intrinsic_w_chain_sdnode() ||
getOperator() == ISE.get_intrinsic_wo_chain_sdnode()) {
unsigned IID =
dynamic_cast<IntInit*>(getChild(0)->getLeafValue())->getValue();
const CodeGenIntrinsic &Int = ISE.getIntrinsicInfo(IID);
bool MadeChange = false;
// Apply the result type to the node.
MadeChange = UpdateNodeType(Int.ArgVTs[0], TP);
if (getNumChildren() != Int.ArgVTs.size())
TP.error("Intrinsic '" + Int.Name + "' expects " +
utostr(Int.ArgVTs.size()-1) + " operands, not " +
utostr(getNumChildren()-1) + " operands!");
// Apply type info to the intrinsic ID.
MadeChange |= getChild(0)->UpdateNodeType(MVT::iPTR, TP);
for (unsigned i = 1, e = getNumChildren(); i != e; ++i) {
MVT::ValueType OpVT = Int.ArgVTs[i];
MadeChange |= getChild(i)->UpdateNodeType(OpVT, TP);
MadeChange |= getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
}
return MadeChange;
} else if (getOperator()->isSubClassOf("SDNode")) {
const SDNodeInfo &NI = ISE.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);
// If this is a vector_shuffle operation, apply types to the build_vector
// operation. The types of the integers don't matter, but this ensures they
// won't get checked.
if (getOperator()->getName() == "vector_shuffle" &&
getChild(2)->getOperator()->getName() == "build_vector") {
TreePatternNode *BV = getChild(2);
const std::vector<MVT::ValueType> &LegalVTs
= ISE.getTargetInfo().getLegalValueTypes();
MVT::ValueType LegalIntVT = MVT::Other;
for (unsigned i = 0, e = LegalVTs.size(); i != e; ++i)
if (MVT::isInteger(LegalVTs[i]) && !MVT::isVector(LegalVTs[i])) {
LegalIntVT = LegalVTs[i];
break;
}
assert(LegalIntVT != MVT::Other && "No legal integer VT?");
for (unsigned i = 0, e = BV->getNumChildren(); i != e; ++i)
MadeChange |= BV->getChild(i)->UpdateNodeType(LegalIntVT, TP);
}
return MadeChange;
} else if (getOperator()->isSubClassOf("Instruction")) {
const DAGInstruction &Inst = ISE.getInstruction(getOperator());
bool MadeChange = false;
unsigned NumResults = Inst.getNumResults();
assert(NumResults <= 1 &&
"Only supports zero or one result instrs!");
CodeGenInstruction &InstInfo =
ISE.getTargetInfo().getInstruction(getOperator()->getName());
// Apply the result type to the node
if (NumResults == 0 || InstInfo.noResults) { // FIXME: temporary hack...
MadeChange = UpdateNodeType(MVT::isVoid, TP);
} else {
Record *ResultNode = Inst.getResult(0);
assert(ResultNode->isSubClassOf("RegisterClass") &&
"Operands should be register classes!");
const CodeGenRegisterClass &RC =
ISE.getTargetInfo().getRegisterClass(ResultNode);
MadeChange = UpdateNodeType(ConvertVTs(RC.getValueTypes()), TP);
}
if (getNumChildren() != Inst.getNumOperands())
TP.error("Instruction '" + getOperator()->getName() + " expects " +
utostr(Inst.getNumOperands()) + " operands, not " +
utostr(getNumChildren()) + " operands!");
for (unsigned i = 0, e = getNumChildren(); i != e; ++i) {
Record *OperandNode = Inst.getOperand(i);
MVT::ValueType VT;
if (OperandNode->isSubClassOf("RegisterClass")) {
const CodeGenRegisterClass &RC =
ISE.getTargetInfo().getRegisterClass(OperandNode);
//VT = RC.getValueTypeNum(0);
MadeChange |=getChild(i)->UpdateNodeType(ConvertVTs(RC.getValueTypes()),
TP);
} else if (OperandNode->isSubClassOf("Operand")) {
VT = getValueType(OperandNode->getValueAsDef("Type"));
MadeChange |= getChild(i)->UpdateNodeType(VT, TP);
} else {
assert(0 && "Unknown operand type!");
abort();
}
MadeChange |= getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
}
return MadeChange;
} else {
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;
}
}
/// 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 santity 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, DAGISelEmitter &ISE){
if (isLeaf()) return true;
for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
if (!getChild(i)->canPatternMatch(Reason, ISE))
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 = ISE.getSDNodeInfo(getOperator());
if (NodeInfo.hasProperty(SDNodeInfo::SDNPCommutative)) {
// Scan all of the operands of the node and make sure that only the last one
// is a constant node.
for (unsigned i = 0, e = getNumChildren()-1; i != e; ++i)
if (!getChild(i)->isLeaf() &&
getChild(i)->getOperator()->getName() == "imm") {
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,
DAGISelEmitter &ise) : TheRecord(TheRec), ISE(ise) {
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,
DAGISelEmitter &ise) : TheRecord(TheRec), ISE(ise) {
isInputPattern = isInput;
Trees.push_back(ParseTreePattern(Pat));
}
TreePattern::TreePattern(Record *TheRec, TreePatternNode *Pat, bool isInput,
DAGISelEmitter &ise) : TheRecord(TheRec), ISE(ise) {
isInputPattern = isInput;
Trees.push_back(Pat);
}
void TreePattern::error(const std::string &Msg) const {
dump();
throw "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);
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")
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 {
std::cerr << '"';
Arg->dump();
std::cerr << "\": ";
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 = getDAGISelEmitter().getIntrinsic(Operator);
unsigned IID = getDAGISelEmitter().getIntrinsicID(Operator)+1;
// If this intrinsic returns void, it must have side-effects and thus a
// chain.
if (Int.ArgVTs[0] == MVT::isVoid) {
Operator = getDAGISelEmitter().get_intrinsic_void_sdnode();
} else if (Int.ModRef != CodeGenIntrinsic::NoMem) {
// Has side-effects, requires chain.
Operator = getDAGISelEmitter().get_intrinsic_w_chain_sdnode();
} else {
// Otherwise, no chain.
Operator = getDAGISelEmitter().get_intrinsic_wo_chain_sdnode();
}
TreePatternNode *IIDNode = new TreePatternNode(new IntInit(IID));
Children.insert(Children.begin(), IIDNode);
}
return new TreePatternNode(Operator, Children);
}
/// InferAllTypes - Infer/propagate as many types throughout the expression
/// patterns as possible. Return true if all types are infered, 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(std::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(std::cerr); }
//===----------------------------------------------------------------------===//
// DAGISelEmitter implementation
//
// Parse all of the SDNode definitions for the target, populating SDNodes.
void DAGISelEmitter::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 buildin 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 DAGISelEmitter::ParseNodeTransforms(std::ostream &OS) {
OS << "\n// Node transformations.\n";
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,
std::make_pair(SDNode, Code)));
if (!Code.empty()) {
std::string ClassName = getSDNodeInfo(SDNode).getSDClassName();
const char *C2 = ClassName == "SDNode" ? "N" : "inN";
OS << "inline SDOperand Transform_" << XFormNode->getName()
<< "(SDNode *" << C2 << ") {\n";
if (ClassName != "SDNode")
OS << " " << ClassName << " *N = cast<" << ClassName << ">(inN);\n";
OS << Code << "\n}\n";
}
Xforms.pop_back();
}
}
void DAGISelEmitter::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.
///
/// This also emits all of the predicate functions to the output file.
///
void DAGISelEmitter::ParsePatternFragments(std::ostream &OS) {
std::vector<Record*> Fragments = Records.getAllDerivedDefinitions("PatFrag");
// First step, parse all of the fragments and emit predicate functions.
OS << "\n// Predicate functions.\n";
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 map, to discard duplicates.
std::vector<std::string> &Args = P->getArgList();
std::set<std::string> OperandsMap(Args.begin(), Args.end());
if (OperandsMap.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());
if (!OpsOp || OpsOp->getDef()->getName() != "ops")
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 (!OperandsMap.count(OpsList->getArgName(j)))
P->error("'" + OpsList->getArgName(j) +
"' does not occur in pattern or was multiply specified!");
OperandsMap.erase(OpsList->getArgName(j));
Args.push_back(OpsList->getArgName(j));
}
if (!OperandsMap.empty())
P->error("Operands list does not contain an entry for operand '" +
*OperandsMap.begin() + "'!");
// If there is a code init for this fragment, emit the predicate code and
// keep track of the fact that this fragment uses it.
std::string Code = Fragments[i]->getValueAsCode("Predicate");
if (!Code.empty()) {
assert(!P->getOnlyTree()->isLeaf() && "Can't be a leaf!");
std::string ClassName =
getSDNodeInfo(P->getOnlyTree()->getOperator()).getSDClassName();
const char *C2 = ClassName == "SDNode" ? "N" : "inN";
OS << "inline bool Predicate_" << Fragments[i]->getName()
<< "(SDNode *" << C2 << ") {\n";
if (ClassName != "SDNode")
OS << " " << ClassName << " *N = cast<" << ClassName << ">(inN);\n";
OS << Code << "\n}\n";
P->getOnlyTree()->setPredicateFn("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);
}
OS << "\n\n";
// 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 (std::map<Record*, TreePattern*>::iterator I = PatternFragments.begin(),
E = PatternFragments.end(); I != E; ++I) {
TreePattern *ThePat = I->second;
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());
}
}
/// 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 {
assert(Pat->getNumChildren() == 0 && "can't be a use with children!");
Rec = Pat->getOperator();
}
// SRCVALUE nodes are ignored.
if (Rec->getName() == "srcvalue")
return false;
TreePatternNode *&Slot = InstInputs[Pat->getName()];
if (!Slot) {
Slot = Pat;
} else {
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 DAGISelEmitter::
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;
} else 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 = false;
if (Pat->getNumChildren() == 0)
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!");
else if (Pat->getNumChildren() & 1)
I->error("set requires an even number of operands");
if (Pat->getTransformFn())
I->error("Cannot specify a transform function on a set node!");
// Check the set destinations.
unsigned NumValues = Pat->getNumChildren()/2;
for (unsigned i = 0; i != NumValues; ++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")) {
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(i+NumValues),
InstInputs, InstResults,
InstImpInputs, InstImpResults);
}
}
/// ParseInstructions - Parse all of the instructions, inlining and resolving
/// any fragments involved. This populates the Instructions list with fully
/// resolved instructions.
void DAGISelEmitter::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) {
// FIXME: temporary hack...
if (InstInfo.noResults) {
// 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.
std::vector<std::string> &Args = I->getArgList();
assert(Args.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) {
const std::string &OpName = CGI.OperandList[i].Name;
if (OpName.empty())
I->error("Operand #" + utostr(i) + " in operands list has no name!");
if (!InstInputsCheck.count(OpName))
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 (CGI.OperandList[i].Rec != InRec &&
!InRec->isSubClassOf("ComplexPattern"))
I->error("Operand $" + OpName + "'s register class disagrees"
" between the operand and pattern");
}
Operands.push_back(CGI.OperandList[i].Rec);
// Construct the result for the dest-pattern operand list.
TreePatternNode *OpNode = InVal->clone();
// No predicate is useful on the result.
OpNode->setPredicateFn("");
// 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.
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>::iterator II = Instructions.begin(),
E = Instructions.end(); II != E; ++II) {
DAGInstruction &TheInst = II->second;
TreePattern *I = TheInst.getPattern();
if (I == 0) continue; // No pattern.
if (I->getNumTrees() != 1) {
std::cerr << "CANNOT HANDLE: " << I->getRecord()->getName() << " yet!";
continue;
}
TreePatternNode *Pattern = I->getTree(0);
TreePatternNode *SrcPattern;
if (Pattern->getOperator()->getName() == "set") {
if (Pattern->getNumChildren() != 2)
continue; // Not a set of a single value (not handled so far)
SrcPattern = Pattern->getChild(1)->clone();
} else{
// Not a set (store or something?)
SrcPattern = Pattern;
}
std::string Reason;
if (!SrcPattern->canPatternMatch(Reason, *this))
I->error("Instruction can never match: " + Reason);
Record *Instr = II->first;
TreePatternNode *DstPattern = TheInst.getResultPattern();
PatternsToMatch.
push_back(PatternToMatch(Instr->getValueAsListInit("Predicates"),
SrcPattern, DstPattern,
Instr->getValueAsInt("AddedComplexity")));
}
}
void DAGISelEmitter::ParsePatterns() {
std::vector<Record*> Patterns = Records.getAllDerivedDefinitions("Pattern");
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
DagInit *Tree = Patterns[i]->getValueAsDag("PatternToMatch");
TreePattern *Pattern = new TreePattern(Patterns[i], Tree, 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->getOnlyTree()->
UpdateNodeType(Result->getOnlyTree()->getExtTypes(), *Result);
IterateInference |= Result->getOnlyTree()->
UpdateNodeType(Pattern->getOnlyTree()->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;
FindPatternInputsAndOutputs(Pattern, Pattern->getOnlyTree(),
InstInputs, InstResults,
InstImpInputs, InstImpResults);
}
// Promote the xform function to be an explicit node if set.
std::vector<TreePatternNode*> ResultNodeOperands;
TreePatternNode *DstPattern = Result->getOnlyTree();
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();
std::string Reason;
if (!Pattern->getOnlyTree()->canPatternMatch(Reason, *this))
Pattern->error("Pattern can never match: " + Reason);
PatternsToMatch.
push_back(PatternToMatch(Patterns[i]->getValueAsListInit("Predicates"),
Pattern->getOnlyTree(),
Temp.getOnlyTree(),
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,
DAGISelEmitter &ISE) {
// 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 = true;
while (NotDone) {
// 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->setPredicateFn(Orig->getPredicateFn());
R->setTransformFn(Orig->getTransformFn());
R->setTypes(Orig->getExtTypes());
// If this pattern cannot every match, do not include it as a variant.
std::string ErrString;
if (!R->canPatternMatch(ErrString, ISE)) {
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])) {
AlreadyExists = true;
break;
}
if (AlreadyExists)
delete R;
else
OutVariants.push_back(R);
}
// Increment indices to the next permutation.
NotDone = false;
// Look for something we can increment without causing a wrap-around.
for (unsigned IdxsIdx = 0; IdxsIdx != Idxs.size(); ++IdxsIdx) {
if (++Idxs[IdxsIdx] < ChildVariants[IdxsIdx].size()) {
NotDone = true; // Found something to increment.
break;
}
Idxs[IdxsIdx] = 0;
}
}
}
/// 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,
DAGISelEmitter &ISE) {
std::vector<std::vector<TreePatternNode*> > ChildVariants;
ChildVariants.push_back(LHS);
ChildVariants.push_back(RHS);
CombineChildVariants(Orig, ChildVariants, OutVariants, ISE);
}
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->getPredicateFn().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,
DAGISelEmitter &ISE) {
// We cannot permute leaves.
if (N->isLeaf()) {
OutVariants.push_back(N);
return;
}
// Look up interesting info about the node.
const SDNodeInfo &NodeInfo = ISE.getSDNodeInfo(N->getOperator());
// If this node is associative, reassociate.
if (NodeInfo.hasProperty(SDNodeInfo::SDNPAssociative)) {
// Reassociate 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, ISE);
GenerateVariantsOf(MaximalChildren[1], BVariants, ISE);
GenerateVariantsOf(MaximalChildren[2], CVariants, ISE);
// 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, ISE);
CombineChildVariants(N, BVariants, AVariants, BAVariants, ISE);
CombineChildVariants(N, AVariants, CVariants, ACVariants, ISE);
CombineChildVariants(N, CVariants, AVariants, CAVariants, ISE);
CombineChildVariants(N, BVariants, CVariants, BCVariants, ISE);
CombineChildVariants(N, CVariants, BVariants, CBVariants, ISE);
// Combine those into the result: (x op x) op x
CombineChildVariants(N, ABVariants, CVariants, OutVariants, ISE);
CombineChildVariants(N, BAVariants, CVariants, OutVariants, ISE);
CombineChildVariants(N, ACVariants, BVariants, OutVariants, ISE);
CombineChildVariants(N, CAVariants, BVariants, OutVariants, ISE);
CombineChildVariants(N, BCVariants, AVariants, OutVariants, ISE);
CombineChildVariants(N, CBVariants, AVariants, OutVariants, ISE);
// Combine those into the result: x op (x op x)
CombineChildVariants(N, CVariants, ABVariants, OutVariants, ISE);
CombineChildVariants(N, CVariants, BAVariants, OutVariants, ISE);
CombineChildVariants(N, BVariants, ACVariants, OutVariants, ISE);
CombineChildVariants(N, BVariants, CAVariants, OutVariants, ISE);
CombineChildVariants(N, AVariants, BCVariants, OutVariants, ISE);
CombineChildVariants(N, AVariants, CBVariants, OutVariants, ISE);
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], ISE);
// Build all permutations based on how the children were formed.
CombineChildVariants(N, ChildVariants, OutVariants, ISE);
// If this node is commutative, consider the commuted order.
if (NodeInfo.hasProperty(SDNodeInfo::SDNPCommutative)) {
assert(N->getNumChildren()==2 &&"Commutative but doesn't have 2 children!");
// Consider the commuted order.
CombineChildVariants(N, ChildVariants[1], ChildVariants[0],
OutVariants, ISE);
}
}
// GenerateVariants - Generate variants. For example, commutative patterns can
// match multiple ways. Add them to PatternsToMatch as well.
void DAGISelEmitter::GenerateVariants() {
DEBUG(std::cerr << "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 agressive 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) {
std::vector<TreePatternNode*> Variants;
GenerateVariantsOf(PatternsToMatch[i].getSrcPattern(), Variants, *this);
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(std::cerr << "FOUND VARIANTS OF: ";
PatternsToMatch[i].getSrcPattern()->dump();
std::cerr << "\n");
for (unsigned v = 0, e = Variants.size(); v != e; ++v) {
TreePatternNode *Variant = Variants[v];
DEBUG(std::cerr << " VAR#" << v << ": ";
Variant->dump();
std::cerr << "\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) {
// Check to see if this variant already exists.
if (Variant->isIsomorphicTo(PatternsToMatch[p].getSrcPattern())) {
DEBUG(std::cerr << " *** 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].getAddedComplexity()));
}
DEBUG(std::cerr << "\n");
}
}
// NodeIsComplexPattern - return true if N is a leaf node and a subclass of
// ComplexPattern.
static bool NodeIsComplexPattern(TreePatternNode *N)
{
return (N->isLeaf() &&
dynamic_cast<DefInit*>(N->getLeafValue()) &&
static_cast<DefInit*>(N->getLeafValue())->getDef()->
isSubClassOf("ComplexPattern"));
}
// NodeGetComplexPattern - return the pointer to the ComplexPattern if N
// is a leaf node and a subclass of ComplexPattern, else it returns NULL.
static const ComplexPattern *NodeGetComplexPattern(TreePatternNode *N,
DAGISelEmitter &ISE)
{
if (N->isLeaf() &&
dynamic_cast<DefInit*>(N->getLeafValue()) &&
static_cast<DefInit*>(N->getLeafValue())->getDef()->
isSubClassOf("ComplexPattern")) {
return &ISE.getComplexPattern(static_cast<DefInit*>(N->getLeafValue())
->getDef());
}
return NULL;
}
/// getPatternSize - Return the 'size' of this pattern. We want to match large
/// patterns before small ones. This is used to determine the size of a
/// pattern.
static unsigned getPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
assert((isExtIntegerInVTs(P->getExtTypes()) ||
isExtFloatingPointInVTs(P->getExtTypes()) ||
P->getExtTypeNum(0) == MVT::isVoid ||
P->getExtTypeNum(0) == MVT::Flag ||
P->getExtTypeNum(0) == MVT::iPTR) &&
"Not a valid pattern node to size!");
unsigned Size = 2; // The node itself.
// If the root node is a ConstantSDNode, increases its size.
// e.g. (set R32:$dst, 0).
if (P->isLeaf() && dynamic_cast<IntInit*>(P->getLeafValue()))
Size++;
// FIXME: This is a hack to statically increase the priority of patterns
// which maps a sub-dag to a complex pattern. e.g. favors LEA over ADD.
// Later we can allow complexity / cost for each pattern to be (optionally)
// specified. To get best possible pattern match we'll need to dynamically
// calculate the complexity of all patterns a dag can potentially map to.
const ComplexPattern *AM = NodeGetComplexPattern(P, ISE);
if (AM)
Size += AM->getNumOperands() * 2;
// If this node has some predicate function that must match, it adds to the
// complexity of this node.
if (!P->getPredicateFn().empty())
++Size;
// Count children in the count if they are also nodes.
for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i) {
TreePatternNode *Child = P->getChild(i);
if (!Child->isLeaf() && Child->getExtTypeNum(0) != MVT::Other)
Size += getPatternSize(Child, ISE);
else if (Child->isLeaf()) {
if (dynamic_cast<IntInit*>(Child->getLeafValue()))
Size += 3; // Matches a ConstantSDNode (+2) and a specific value (+1).
else if (NodeIsComplexPattern(Child))
Size += getPatternSize(Child, ISE);
else if (!Child->getPredicateFn().empty())
++Size;
}
}
return Size;
}
/// getResultPatternCost - Compute the number of instructions for this pattern.
/// This is a temporary hack. We should really include the instruction
/// latencies in this calculation.
static unsigned getResultPatternCost(TreePatternNode *P, DAGISelEmitter &ISE) {
if (P->isLeaf()) return 0;
unsigned Cost = 0;
Record *Op = P->getOperator();
if (Op->isSubClassOf("Instruction")) {
Cost++;
CodeGenInstruction &II = ISE.getTargetInfo().getInstruction(Op->getName());
if (II.usesCustomDAGSchedInserter)
Cost += 10;
}
for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i)
Cost += getResultPatternCost(P->getChild(i), ISE);
return Cost;
}
/// getResultPatternCodeSize - Compute the code size of instructions for this
/// pattern.
static unsigned getResultPatternSize(TreePatternNode *P, DAGISelEmitter &ISE) {
if (P->isLeaf()) return 0;
unsigned Cost = 0;
Record *Op = P->getOperator();
if (Op->isSubClassOf("Instruction")) {
Cost += Op->getValueAsInt("CodeSize");
}
for (unsigned i = 0, e = P->getNumChildren(); i != e; ++i)
Cost += getResultPatternSize(P->getChild(i), ISE);
return Cost;
}
// PatternSortingPredicate - return true if we prefer to match LHS before RHS.
// In particular, we want to match maximal patterns first and lowest cost within
// a particular complexity first.
struct PatternSortingPredicate {
PatternSortingPredicate(DAGISelEmitter &ise) : ISE(ise) {};
DAGISelEmitter &ISE;
bool operator()(PatternToMatch *LHS,
PatternToMatch *RHS) {
unsigned LHSSize = getPatternSize(LHS->getSrcPattern(), ISE);
unsigned RHSSize = getPatternSize(RHS->getSrcPattern(), ISE);
LHSSize += LHS->getAddedComplexity();
RHSSize += RHS->getAddedComplexity();
if (LHSSize > RHSSize) return true; // LHS -> bigger -> less cost
if (LHSSize < RHSSize) return false;
// If the patterns have equal complexity, compare generated instruction cost
unsigned LHSCost = getResultPatternCost(LHS->getDstPattern(), ISE);
unsigned RHSCost = getResultPatternCost(RHS->getDstPattern(), ISE);
if (LHSCost < RHSCost) return true;
if (LHSCost > RHSCost) return false;
return getResultPatternSize(LHS->getDstPattern(), ISE) <
getResultPatternSize(RHS->getDstPattern(), ISE);
}
};
/// getRegisterValueType - Look up and return the first ValueType of specified
/// RegisterClass record
static MVT::ValueType getRegisterValueType(Record *R, const CodeGenTarget &T) {
if (const CodeGenRegisterClass *RC = T.getRegisterClassForRegister(R))
return RC->getValueTypeNum(0);
return MVT::Other;
}
/// RemoveAllTypes - A quick recursive walk over a pattern which removes all
/// type information from it.
static void RemoveAllTypes(TreePatternNode *N) {
N->removeTypes();
if (!N->isLeaf())
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i)
RemoveAllTypes(N->getChild(i));
}
Record *DAGISelEmitter::getSDNodeNamed(const std::string &Name) const {
Record *N = Records.getDef(Name);
if (!N || !N->isSubClassOf("SDNode")) {
std::cerr << "Error getting SDNode '" << Name << "'!\n";
exit(1);
}
return N;
}
/// NodeHasProperty - return true if TreePatternNode has the specified
/// property.
static bool NodeHasProperty(TreePatternNode *N, SDNodeInfo::SDNP Property,
DAGISelEmitter &ISE)
{
if (N->isLeaf()) return false;
Record *Operator = N->getOperator();
if (!Operator->isSubClassOf("SDNode")) return false;
const SDNodeInfo &NodeInfo = ISE.getSDNodeInfo(Operator);
return NodeInfo.hasProperty(Property);
}
static bool PatternHasProperty(TreePatternNode *N, SDNodeInfo::SDNP Property,
DAGISelEmitter &ISE)
{
if (NodeHasProperty(N, Property, ISE))
return true;
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i) {
TreePatternNode *Child = N->getChild(i);
if (PatternHasProperty(Child, Property, ISE))
return true;
}
return false;
}
class PatternCodeEmitter {
private:
DAGISelEmitter &ISE;
// Predicates.
ListInit *Predicates;
// Pattern cost.
unsigned Cost;
// Instruction selector pattern.
TreePatternNode *Pattern;
// Matched instruction.
TreePatternNode *Instruction;
// Node to name mapping
std::map<std::string, std::string> VariableMap;
// Node to operator mapping
std::map<std::string, Record*> OperatorMap;
// Names of all the folded nodes which produce chains.
std::vector<std::pair<std::string, unsigned> > FoldedChains;
std::set<std::string> Duplicates;
/// These nodes are being marked "in-flight" so they cannot be folded.
std::vector<std::string> InflightNodes;
/// GeneratedCode - This is the buffer that we emit code to. The first bool
/// indicates whether this is an exit predicate (something that should be
/// tested, and if true, the match fails) [when true] or normal code to emit
/// [when false].
std::vector<std::pair<bool, std::string> > &GeneratedCode;
/// GeneratedDecl - This is the set of all SDOperand declarations needed for
/// the set of patterns for each top-level opcode.
std::set<std::pair<unsigned, std::string> > &GeneratedDecl;
/// TargetOpcodes - The target specific opcodes used by the resulting
/// instructions.
std::vector<std::string> &TargetOpcodes;
std::vector<std::string> &TargetVTs;
std::string ChainName;
bool NewTF;
bool DoReplace;
unsigned TmpNo;
unsigned OpcNo;
unsigned VTNo;
void emitCheck(const std::string &S) {
if (!S.empty())
GeneratedCode.push_back(std::make_pair(true, S));
}
void emitCode(const std::string &S) {
if (!S.empty())
GeneratedCode.push_back(std::make_pair(false, S));
}
void emitDecl(const std::string &S, unsigned T=0) {
assert(!S.empty() && "Invalid declaration");
GeneratedDecl.insert(std::make_pair(T, S));
}
void emitOpcode(const std::string &Opc) {
TargetOpcodes.push_back(Opc);
OpcNo++;
}
void emitVT(const std::string &VT) {
TargetVTs.push_back(VT);
VTNo++;
}
public:
PatternCodeEmitter(DAGISelEmitter &ise, ListInit *preds,
TreePatternNode *pattern, TreePatternNode *instr,
std::vector<std::pair<bool, std::string> > &gc,
std::set<std::pair<unsigned, std::string> > &gd,
std::vector<std::string> &to,
std::vector<std::string> &tv,
bool dorep)
: ISE(ise), Predicates(preds), Pattern(pattern), Instruction(instr),
GeneratedCode(gc), GeneratedDecl(gd), TargetOpcodes(to), TargetVTs(tv),
NewTF(false), DoReplace(dorep), TmpNo(0), OpcNo(0), VTNo(0) {}
/// EmitMatchCode - Emit a matcher for N, going to the label for PatternNo
/// if the match fails. At this point, we already know that the opcode for N
/// matches, and the SDNode for the result has the RootName specified name.
void EmitMatchCode(TreePatternNode *N, TreePatternNode *P,
const std::string &RootName, const std::string &ParentName,
const std::string &ChainSuffix, bool &FoundChain) {
bool isRoot = (P == NULL);
// Emit instruction predicates. Each predicate is just a string for now.
if (isRoot) {
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") + ")";
}
}
emitCheck(PredicateCheck);
}
if (N->isLeaf()) {
if (IntInit *II = dynamic_cast<IntInit*>(N->getLeafValue())) {
emitCheck("cast<ConstantSDNode>(" + RootName +
")->getSignExtended() == " + itostr(II->getValue()));
return;
} else if (!NodeIsComplexPattern(N)) {
assert(0 && "Cannot match this as a leaf value!");
abort();
}
}
// If this node has a name associated with it, capture it in VariableMap. If
// we already saw this in the pattern, emit code to verify dagness.
if (!N->getName().empty()) {
std::string &VarMapEntry = VariableMap[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.
emitCheck(VarMapEntry + " == " + RootName);
return;
}
if (!N->isLeaf())
OperatorMap[N->getName()] = N->getOperator();
}
// Emit code to load the child nodes and match their contents recursively.
unsigned OpNo = 0;
bool NodeHasChain = NodeHasProperty (N, SDNodeInfo::SDNPHasChain, ISE);
bool HasChain = PatternHasProperty(N, SDNodeInfo::SDNPHasChain, ISE);
bool HasOutFlag = PatternHasProperty(N, SDNodeInfo::SDNPOutFlag, ISE);
bool EmittedUseCheck = false;
bool EmittedSlctedCheck = false;
if (HasChain) {
if (NodeHasChain)
OpNo = 1;
if (!isRoot) {
const SDNodeInfo &CInfo = ISE.getSDNodeInfo(N->getOperator());
// Not in flight?
emitCheck("InFlightSet.count(" + RootName + ".Val) == 0");
// Multiple uses of actual result?
emitCheck(RootName + ".hasOneUse()");
EmittedUseCheck = true;
// hasOneUse() check is not strong enough. If the original node has
// already been selected, it may have been replaced with another.
for (unsigned j = 0; j != CInfo.getNumResults(); j++)
emitCheck("!CodeGenMap.count(" + RootName + ".getValue(" + utostr(j) +
"))");
EmittedSlctedCheck = true;
if (NodeHasChain) {
// FIXME: Don't fold if 1) the parent node writes a flag, 2) the node
// has a chain use.
// This a workaround for this problem:
//
// [ch, r : ld]
// ^ ^
// | |
// [XX]--/ \- [flag : cmp]
// ^ ^
// | |
// \---[br flag]-
//
// cmp + br should be considered as a single node as they are flagged
// together. So, if the ld is folded into the cmp, the XX node in the
// graph is now both an operand and a use of the ld/cmp/br node.
if (NodeHasProperty(P, SDNodeInfo::SDNPOutFlag, ISE))
emitCheck(ParentName + ".Val->isOnlyUse(" + RootName + ".Val)");
// If the immediate use can somehow reach this node through another
// path, then can't fold it either or it will create a cycle.
// e.g. In the following diagram, XX can reach ld through YY. If
// ld is folded into XX, then YY is both a predecessor and a successor
// of XX.
//
// [ld]
// ^ ^
// | |
// / \---
// / [YY]
// | ^
// [XX]-------|
const SDNodeInfo &PInfo = ISE.getSDNodeInfo(P->getOperator());
if (PInfo.getNumOperands() > 1 ||
PInfo.hasProperty(SDNodeInfo::SDNPHasChain) ||
PInfo.hasProperty(SDNodeInfo::SDNPInFlag) ||
PInfo.hasProperty(SDNodeInfo::SDNPOptInFlag))
if (PInfo.getNumOperands() > 1) {
emitCheck("!isNonImmUse(" + ParentName + ".Val, " + RootName +
".Val)");
} else {
emitCheck("(" + ParentName + ".getNumOperands() == 1 || !" +
"isNonImmUse(" + ParentName + ".Val, " + RootName +
".Val))");
}
}
}
if (NodeHasChain) {
ChainName = "Chain" + ChainSuffix;
emitDecl(ChainName);
if (FoundChain) {
// FIXME: temporary workaround for a common case where chain
// is a TokenFactor and the previous "inner" chain is an operand.
NewTF = true;
emitDecl("OldTF", 1);
emitCheck("(" + ChainName + " = UpdateFoldedChain(CurDAG, " +
RootName + ".Val, Chain.Val, OldTF)).Val");
} else {
FoundChain = true;
emitCode(ChainName + " = " + RootName + ".getOperand(0);");
}
}
}
// Don't fold any node which reads or writes a flag and has multiple uses.
// FIXME: We really need to separate the concepts of flag and "glue". Those
// real flag results, e.g. X86CMP output, can have multiple uses.
// FIXME: If the optional incoming flag does not exist. Then it is ok to
// fold it.
if (!isRoot &&
(PatternHasProperty(N, SDNodeInfo::SDNPInFlag, ISE) ||
PatternHasProperty(N, SDNodeInfo::SDNPOptInFlag, ISE) ||
PatternHasProperty(N, SDNodeInfo::SDNPOutFlag, ISE))) {
const SDNodeInfo &CInfo = ISE.getSDNodeInfo(N->getOperator());
if (!EmittedUseCheck) {
// Multiple uses of actual result?
emitCheck(RootName + ".hasOneUse()");
}
if (!EmittedSlctedCheck)
// hasOneUse() check is not strong enough. If the original node has
// already been selected, it may have been replaced with another.
for (unsigned j = 0; j < CInfo.getNumResults(); j++)
emitCheck("!CodeGenMap.count(" + RootName + ".getValue(" + utostr(j) +
"))");
}
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
emitDecl(RootName + utostr(OpNo));
emitCode(RootName + utostr(OpNo) + " = " +
RootName + ".getOperand(" +utostr(OpNo) + ");");
TreePatternNode *Child = N->getChild(i);
if (!Child->isLeaf()) {
// If it's not a leaf, recursively match.
const SDNodeInfo &CInfo = ISE.getSDNodeInfo(Child->getOperator());
emitCheck(RootName + utostr(OpNo) + ".getOpcode() == " +
CInfo.getEnumName());
EmitMatchCode(Child, N, RootName + utostr(OpNo), RootName,
ChainSuffix + utostr(OpNo), FoundChain);
if (NodeHasProperty(Child, SDNodeInfo::SDNPHasChain, ISE))
FoldedChains.push_back(std::make_pair(RootName + utostr(OpNo),
CInfo.getNumResults()));
} 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 = VariableMap[Child->getName()];
if (VarMapEntry.empty()) {
VarMapEntry = RootName + utostr(OpNo);
} 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.
emitCheck(VarMapEntry + " == " + RootName + utostr(OpNo));
Duplicates.insert(RootName + utostr(OpNo));
continue;
}
}
// Handle leaves of various types.
if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
Record *LeafRec = DI->getDef();
if (LeafRec->isSubClassOf("RegisterClass")) {
// Handle register references. Nothing to do here.
} else if (LeafRec->isSubClassOf("Register")) {
// Handle register references.
} else if (LeafRec->isSubClassOf("ComplexPattern")) {
// Handle complex pattern. Nothing to do here.
} else if (LeafRec->getName() == "srcvalue") {
// Place holder for SRCVALUE nodes. Nothing to do here.
} else if (LeafRec->isSubClassOf("ValueType")) {
// Make sure this is the specified value type.
emitCheck("cast<VTSDNode>(" + RootName + utostr(OpNo) +
")->getVT() == MVT::" + LeafRec->getName());
} else if (LeafRec->isSubClassOf("CondCode")) {
// Make sure this is the specified cond code.
emitCheck("cast<CondCodeSDNode>(" + RootName + utostr(OpNo) +
")->get() == ISD::" + LeafRec->getName());
} else {
#ifndef NDEBUG
Child->dump();
std::cerr << " ";
#endif
assert(0 && "Unknown leaf type!");
}
} else if (IntInit *II =
dynamic_cast<IntInit*>(Child->getLeafValue())) {
emitCheck("isa<ConstantSDNode>(" + RootName + utostr(OpNo) + ")");
unsigned CTmp = TmpNo++;
emitCode("int64_t CN"+utostr(CTmp)+" = cast<ConstantSDNode>("+
RootName + utostr(OpNo) + ")->getSignExtended();");
emitCheck("CN" + utostr(CTmp) + " == " +itostr(II->getValue()));
} else {
#ifndef NDEBUG
Child->dump();
#endif
assert(0 && "Unknown leaf type!");
}
}
}
// If there is a node predicate for this, emit the call.
if (!N->getPredicateFn().empty())
emitCheck(N->getPredicateFn() + "(" + RootName + ".Val)");
}
/// EmitResultCode - Emit the action for a pattern. Now that it has matched
/// we actually have to build a DAG!
std::pair<unsigned, unsigned>
EmitResultCode(TreePatternNode *N, bool LikeLeaf = false,
bool isRoot = false) {
// This is something selected from the pattern we matched.
if (!N->getName().empty()) {
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.
return std::make_pair(1, atoi(Val.c_str()+3));
}
const ComplexPattern *CP;
unsigned ResNo = TmpNo++;
unsigned NumRes = 1;
if (!N->isLeaf() && N->getOperator()->getName() == "imm") {
assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
std::string CastType;
switch (N->getTypeNum(0)) {
default: assert(0 && "Unknown type for constant node!");
case MVT::i1: CastType = "bool"; break;
case MVT::i8: CastType = "unsigned char"; break;
case MVT::i16: CastType = "unsigned short"; break;
case MVT::i32: CastType = "unsigned"; break;
case MVT::i64: CastType = "uint64_t"; break;
}
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) +
" = CurDAG->getTargetConstant(((" + CastType +
") cast<ConstantSDNode>(" + Val + ")->getValue()), " +
getEnumName(N->getTypeNum(0)) + ");");
} else if (!N->isLeaf() && N->getOperator()->getName() == "texternalsym"){
Record *Op = OperatorMap[N->getName()];
// Transform ExternalSymbol to TargetExternalSymbol
if (Op && Op->getName() == "externalsym") {
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = CurDAG->getTarget"
"ExternalSymbol(cast<ExternalSymbolSDNode>(" +
Val + ")->getSymbol(), " +
getEnumName(N->getTypeNum(0)) + ");");
} else {
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = " + Val + ";");
}
} else if (!N->isLeaf() && N->getOperator()->getName() == "tglobaladdr") {
Record *Op = OperatorMap[N->getName()];
// Transform GlobalAddress to TargetGlobalAddress
if (Op && Op->getName() == "globaladdr") {
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = CurDAG->getTarget"
"GlobalAddress(cast<GlobalAddressSDNode>(" + Val +
")->getGlobal(), " + getEnumName(N->getTypeNum(0)) +
");");
} else {
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = " + Val + ";");
}
} else if (!N->isLeaf() && N->getOperator()->getName() == "texternalsym"){
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = " + Val + ";");
} else if (!N->isLeaf() && N->getOperator()->getName() == "tconstpool") {
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = " + Val + ";");
} else if (N->isLeaf() && (CP = NodeGetComplexPattern(N, ISE))) {
std::string Fn = CP->getSelectFunc();
NumRes = CP->getNumOperands();
for (unsigned i = 0; i < NumRes; ++i)
emitDecl("CPTmp" + utostr(i+ResNo));
std::string Code = "bool Match = " + Fn + "(" + Val;
for (unsigned i = 0; i < NumRes; i++)
Code += ", CPTmp" + utostr(i + ResNo);
emitCode(Code + ");");
if (InflightNodes.size()) {
// Remove the in-flight nodes if the ComplexPattern does not match!
emitCode("if (!Match) {");
for (std::vector<std::string>::iterator AI = InflightNodes.begin(),
AE = InflightNodes.end(); AI != AE; ++AI)
emitCode(" SelectionDAG::RemoveInFlightSetEntry(InFlightSet, " +
*AI + ".Val);");
emitCode("}");
}
emitCheck("Match");
for (unsigned i = 0; i < NumRes; ++i) {
emitCode("SelectionDAG::InsertInFlightSetEntry(InFlightSet, CPTmp" +
utostr(i+ResNo) + ".Val);");
InflightNodes.push_back("CPTmp" + utostr(i+ResNo));
}
for (unsigned i = 0; i < NumRes; ++i) {
emitDecl("Tmp" + utostr(i+ResNo));
emitCode("Select(Tmp" + utostr(i+ResNo) + ", CPTmp" +
utostr(i+ResNo) + ");");
}
TmpNo = ResNo + NumRes;
} else {
emitDecl("Tmp" + utostr(ResNo));
// This node, probably wrapped in a SDNodeXForms, behaves like a leaf
// node even if it isn't one. Don't select it.
if (LikeLeaf)
emitCode("Tmp" + utostr(ResNo) + " = " + Val + ";");
else {
emitCode("Select(Tmp" + utostr(ResNo) + ", " + Val + ");");
}
if (isRoot && N->isLeaf()) {
emitCode("Result = Tmp" + utostr(ResNo) + ";");
emitCode("return;");
}
}
// Add Tmp<ResNo> to VariableMap, so that we don't multiply select this
// value if used multiple times by this pattern result.
Val = "Tmp"+utostr(ResNo);
return std::make_pair(NumRes, ResNo);
}
if (N->isLeaf()) {
// If this is an explicit register reference, handle it.
if (DefInit *DI = dynamic_cast<DefInit*>(N->getLeafValue())) {
unsigned ResNo = TmpNo++;
if (DI->getDef()->isSubClassOf("Register")) {
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = CurDAG->getRegister(" +
ISE.getQualifiedName(DI->getDef()) + ", " +
getEnumName(N->getTypeNum(0)) + ");");
return std::make_pair(1, ResNo);
}
} else if (IntInit *II = dynamic_cast<IntInit*>(N->getLeafValue())) {
unsigned ResNo = TmpNo++;
assert(N->getExtTypes().size() == 1 && "Multiple types not handled!");
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) +
" = CurDAG->getTargetConstant(" + itostr(II->getValue()) +
", " + getEnumName(N->getTypeNum(0)) + ");");
return std::make_pair(1, ResNo);
}
#ifndef NDEBUG
N->dump();
#endif
assert(0 && "Unknown leaf type!");
return std::make_pair(1, ~0U);
}
Record *Op = N->getOperator();
if (Op->isSubClassOf("Instruction")) {
const CodeGenTarget &CGT = ISE.getTargetInfo();
CodeGenInstruction &II = CGT.getInstruction(Op->getName());
const DAGInstruction &Inst = ISE.getInstruction(Op);
TreePattern *InstPat = Inst.getPattern();
TreePatternNode *InstPatNode =
isRoot ? (InstPat ? InstPat->getOnlyTree() : Pattern)
: (InstPat ? InstPat->getOnlyTree() : NULL);
if (InstPatNode && InstPatNode->getOperator()->getName() == "set") {
InstPatNode = InstPatNode->getChild(1);
}
bool HasVarOps = isRoot && II.hasVariableNumberOfOperands;
bool HasImpInputs = isRoot && Inst.getNumImpOperands() > 0;
bool HasImpResults = isRoot && Inst.getNumImpResults() > 0;
bool NodeHasOptInFlag = isRoot &&
PatternHasProperty(Pattern, SDNodeInfo::SDNPOptInFlag, ISE);
bool NodeHasInFlag = isRoot &&
PatternHasProperty(Pattern, SDNodeInfo::SDNPInFlag, ISE);
bool NodeHasOutFlag = HasImpResults || (isRoot &&
PatternHasProperty(Pattern, SDNodeInfo::SDNPOutFlag, ISE));
bool NodeHasChain = InstPatNode &&
PatternHasProperty(InstPatNode, SDNodeInfo::SDNPHasChain, ISE);
bool InputHasChain = isRoot &&
NodeHasProperty(Pattern, SDNodeInfo::SDNPHasChain, ISE);
if (NodeHasInFlag || NodeHasOutFlag || NodeHasOptInFlag || HasImpInputs)
emitDecl("InFlag");
if (NodeHasOptInFlag) {
emitDecl("HasInFlag", 2);
emitCode("HasInFlag = "
"(N.getOperand(N.getNumOperands()-1).getValueType() == MVT::Flag);");
}
if (HasVarOps)
emitCode("std::vector<SDOperand> Ops;");
// How many results is this pattern expected to produce?
unsigned PatResults = 0;
for (unsigned i = 0, e = Pattern->getExtTypes().size(); i != e; i++) {
MVT::ValueType VT = Pattern->getTypeNum(i);
if (VT != MVT::isVoid && VT != MVT::Flag)
PatResults++;
}
// Determine operand emission order. Complex pattern first.
std::vector<std::pair<unsigned, TreePatternNode*> > EmitOrder;
std::vector<std::pair<unsigned, TreePatternNode*> >::iterator OI;
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i) {
TreePatternNode *Child = N->getChild(i);
if (i == 0) {
EmitOrder.push_back(std::make_pair(i, Child));
OI = EmitOrder.begin();
} else if (NodeIsComplexPattern(Child)) {
OI = EmitOrder.insert(OI, std::make_pair(i, Child));
} else {
EmitOrder.push_back(std::make_pair(i, Child));
}
}
// Make sure these operands which would be selected won't be folded while
// the isel traverses the DAG upward.
for (unsigned i = 0, e = EmitOrder.size(); i != e; ++i) {
TreePatternNode *Child = EmitOrder[i].second;
if (!Child->getName().empty()) {
std::string &Val = VariableMap[Child->getName()];
assert(!Val.empty() &&
"Variable referenced but not defined and not caught earlier!");
if (Child->isLeaf() && !NodeGetComplexPattern(Child, ISE)) {
emitCode("SelectionDAG::InsertInFlightSetEntry(InFlightSet, " +
Val + ".Val);");
InflightNodes.push_back(Val);
}
}
}
// Emit all of the operands.
std::vector<std::pair<unsigned, unsigned> > NumTemps(EmitOrder.size());
for (unsigned i = 0, e = EmitOrder.size(); i != e; ++i) {
unsigned OpOrder = EmitOrder[i].first;
TreePatternNode *Child = EmitOrder[i].second;
std::pair<unsigned, unsigned> NumTemp = EmitResultCode(Child);
NumTemps[OpOrder] = NumTemp;
}
// List all the operands in the right order.
std::vector<unsigned> Ops;
for (unsigned i = 0, e = NumTemps.size(); i != e; i++) {
for (unsigned j = 0; j < NumTemps[i].first; j++)
Ops.push_back(NumTemps[i].second + j);
}
// Emit all the chain and CopyToReg stuff.
bool ChainEmitted = NodeHasChain;
if (NodeHasChain)
emitCode("Select(" + ChainName + ", " + ChainName + ");");
if (NodeHasInFlag || HasImpInputs)
EmitInFlagSelectCode(Pattern, "N", ChainEmitted, true);
if (NodeHasOptInFlag) {
emitCode("if (HasInFlag)");
emitCode(" Select(InFlag, N.getOperand(N.getNumOperands()-1));");
}
if (isRoot) {
// The operands have been selected. Remove them from InFlightSet.
for (std::vector<std::string>::iterator AI = InflightNodes.begin(),
AE = InflightNodes.end(); AI != AE; ++AI)
emitCode("SelectionDAG::RemoveInFlightSetEntry(InFlightSet, " +
*AI + ".Val);");
}
unsigned NumResults = Inst.getNumResults();
unsigned ResNo = TmpNo++;
if (!isRoot || InputHasChain || NodeHasChain || NodeHasOutFlag ||
NodeHasOptInFlag) {
std::string Code;
std::string Code2;
std::string NodeName;
if (!isRoot) {
NodeName = "Tmp" + utostr(ResNo);
emitDecl(NodeName);
Code2 = NodeName + " = SDOperand(";
} else {
NodeName = "ResNode";
emitDecl(NodeName, true);
Code2 = NodeName + " = ";
}
Code = "CurDAG->getTargetNode(Opc" + utostr(OpcNo);
emitOpcode(II.Namespace + "::" + II.TheDef->getName());
// Output order: results, chain, flags
// Result types.
if (NumResults > 0 && N->getTypeNum(0) != MVT::isVoid) {
Code += ", VT" + utostr(VTNo);
emitVT(getEnumName(N->getTypeNum(0)));
}
if (NodeHasChain)
Code += ", MVT::Other";
if (NodeHasOutFlag)
Code += ", MVT::Flag";
// Inputs.
for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
if (HasVarOps)
emitCode("Ops.push_back(Tmp" + utostr(Ops[i]) + ");");
else
Code += ", Tmp" + utostr(Ops[i]);
}
if (HasVarOps) {
if (NodeHasInFlag || HasImpInputs)
emitCode("for (unsigned i = 2, e = N.getNumOperands()-1; "
"i != e; ++i) {");
else if (NodeHasOptInFlag)
emitCode("for (unsigned i = 2, e = N.getNumOperands()-"
"(HasInFlag?1:0); i != e; ++i) {");
else
emitCode("for (unsigned i = 2, e = N.getNumOperands(); "
"i != e; ++i) {");
emitCode(" SDOperand VarOp(0, 0);");
emitCode(" Select(VarOp, N.getOperand(i));");
emitCode(" Ops.push_back(VarOp);");
emitCode("}");
}
if (NodeHasChain) {
if (HasVarOps)
emitCode("Ops.push_back(" + ChainName + ");");
else
Code += ", " + ChainName;
}
if (NodeHasInFlag || HasImpInputs) {
if (HasVarOps)
emitCode("Ops.push_back(InFlag);");
else
Code += ", InFlag";
} else if (NodeHasOptInFlag && HasVarOps) {
emitCode("if (HasInFlag)");
emitCode(" Ops.push_back(InFlag);");
}
if (HasVarOps)
Code += ", Ops";
else if (NodeHasOptInFlag)
Code = "HasInFlag ? " + Code + ", InFlag) : " + Code;
if (!isRoot)
Code += "), 0";
emitCode(Code2 + Code + ");");
if (NodeHasChain)
// Remember which op produces the chain.
if (!isRoot)
emitCode(ChainName + " = SDOperand(" + NodeName +
".Val, " + utostr(PatResults) + ");");
else
emitCode(ChainName + " = SDOperand(" + NodeName +
", " + utostr(PatResults) + ");");
if (!isRoot)
return std::make_pair(1, ResNo);
if (NewTF)
emitCode("if (OldTF) "
"SelectionDAG::InsertISelMapEntry(CodeGenMap, OldTF, 0, " +
ChainName + ".Val, 0);");
for (unsigned i = 0; i < NumResults; i++)
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, " +
utostr(i) + ", ResNode, " + utostr(i) + ");");
if (NodeHasOutFlag)
emitCode("InFlag = SDOperand(ResNode, " +
utostr(NumResults + (unsigned)NodeHasChain) + ");");
if (HasImpResults && EmitCopyFromRegs(N, ChainEmitted)) {
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, "
"0, ResNode, 0);");
NumResults = 1;
}
if (InputHasChain) {
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, " +
utostr(PatResults) + ", " + ChainName + ".Val, " +
ChainName + ".ResNo" + ");");
if (DoReplace)
emitCode("if (N.ResNo == 0) AddHandleReplacement(N.Val, " +
utostr(PatResults) + ", " + ChainName + ".Val, " +
ChainName + ".ResNo" + ");");
}
if (FoldedChains.size() > 0) {
std::string Code;
for (unsigned j = 0, e = FoldedChains.size(); j < e; j++)
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, " +
FoldedChains[j].first + ".Val, " +
utostr(FoldedChains[j].second) + ", ResNode, " +
utostr(NumResults) + ");");
for (unsigned j = 0, e = FoldedChains.size(); j < e; j++) {
std::string Code =
FoldedChains[j].first + ".Val, " +
utostr(FoldedChains[j].second) + ", ";
emitCode("AddHandleReplacement(" + Code + "ResNode, " +
utostr(NumResults) + ");");
}
}
if (NodeHasOutFlag)
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, " +
utostr(PatResults + (unsigned)InputHasChain) +
", InFlag.Val, InFlag.ResNo);");
// User does not expect the instruction would produce a chain!
bool AddedChain = NodeHasChain && !InputHasChain;
if (AddedChain && NodeHasOutFlag) {
if (PatResults == 0) {
emitCode("Result = SDOperand(ResNode, N.ResNo+1);");
} else {
emitCode("if (N.ResNo < " + utostr(PatResults) + ")");
emitCode(" Result = SDOperand(ResNode, N.ResNo);");
emitCode("else");
emitCode(" Result = SDOperand(ResNode, N.ResNo+1);");
}
} else if (InputHasChain && !NodeHasChain) {
// One of the inner node produces a chain.
emitCode("if (N.ResNo < " + utostr(PatResults) + ")");
emitCode(" Result = SDOperand(ResNode, N.ResNo);");
if (NodeHasOutFlag) {
emitCode("else if (N.ResNo > " + utostr(PatResults) + ")");
emitCode(" Result = SDOperand(ResNode, N.ResNo-1);");
}
emitCode("else");
emitCode(" Result = SDOperand(" + ChainName + ".Val, " +
ChainName + ".ResNo);");
} else {
emitCode("Result = SDOperand(ResNode, N.ResNo);");
}
} else {
// If this instruction is the root, and if there is only one use of it,
// use SelectNodeTo instead of getTargetNode to avoid an allocation.
emitCode("if (N.Val->hasOneUse()) {");
std::string Code = " Result = CurDAG->SelectNodeTo(N.Val, Opc" +
utostr(OpcNo);
if (N->getTypeNum(0) != MVT::isVoid)
Code += ", VT" + utostr(VTNo);
if (NodeHasOutFlag)
Code += ", MVT::Flag";
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
Code += ", Tmp" + utostr(Ops[i]);
if (NodeHasInFlag || HasImpInputs)
Code += ", InFlag";
emitCode(Code + ");");
emitCode("} else {");
emitDecl("ResNode", 1);
Code = " ResNode = CurDAG->getTargetNode(Opc" + utostr(OpcNo);
emitOpcode(II.Namespace + "::" + II.TheDef->getName());
if (N->getTypeNum(0) != MVT::isVoid) {
Code += ", VT" + utostr(VTNo);
emitVT(getEnumName(N->getTypeNum(0)));
}
if (NodeHasOutFlag)
Code += ", MVT::Flag";
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
Code += ", Tmp" + utostr(Ops[i]);
if (NodeHasInFlag || HasImpInputs)
Code += ", InFlag";
emitCode(Code + ");");
emitCode(" SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, N.ResNo"
", ResNode, 0);");
emitCode(" Result = SDOperand(ResNode, 0);");
emitCode("}");
}
if (isRoot)
emitCode("return;");
return std::make_pair(1, ResNo);
} else if (Op->isSubClassOf("SDNodeXForm")) {
assert(N->getNumChildren() == 1 && "node xform should have one child!");
// PatLeaf node - the operand may or may not be a leaf node. But it should
// behave like one.
unsigned OpVal = EmitResultCode(N->getChild(0), true).second;
unsigned ResNo = TmpNo++;
emitDecl("Tmp" + utostr(ResNo));
emitCode("Tmp" + utostr(ResNo) + " = Transform_" + Op->getName()
+ "(Tmp" + utostr(OpVal) + ".Val);");
if (isRoot) {
emitCode("SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val,"
"N.ResNo, Tmp" + utostr(ResNo) + ".Val, Tmp" +
utostr(ResNo) + ".ResNo);");
emitCode("Result = Tmp" + utostr(ResNo) + ";");
emitCode("return;");
}
return std::make_pair(1, ResNo);
} else {
N->dump();
std::cerr << "\n";
throw std::string("Unknown node in result pattern!");
}
}
/// InsertOneTypeCheck - Insert a type-check for an unresolved type in 'Pat'
/// and add it to the tree. 'Pat' and 'Other' are isomorphic trees except that
/// 'Pat' may be missing types. If we find an unresolved type to add a check
/// for, this returns true otherwise false if Pat has all types.
bool InsertOneTypeCheck(TreePatternNode *Pat, TreePatternNode *Other,
const std::string &Prefix) {
// Did we find one?
if (Pat->getExtTypes() != Other->getExtTypes()) {
// Move a type over from 'other' to 'pat'.
Pat->setTypes(Other->getExtTypes());
emitCheck(Prefix + ".Val->getValueType(0) == " +
getName(Pat->getTypeNum(0)));
return true;
}
unsigned OpNo =
(unsigned) NodeHasProperty(Pat, SDNodeInfo::SDNPHasChain, ISE);
for (unsigned i = 0, e = Pat->getNumChildren(); i != e; ++i, ++OpNo)
if (InsertOneTypeCheck(Pat->getChild(i), Other->getChild(i),
Prefix + utostr(OpNo)))
return true;
return false;
}
private:
/// EmitInFlagSelectCode - Emit the flag operands for the DAG that is
/// being built.
void EmitInFlagSelectCode(TreePatternNode *N, const std::string &RootName,
bool &ChainEmitted, bool isRoot = false) {
const CodeGenTarget &T = ISE.getTargetInfo();
unsigned OpNo =
(unsigned) NodeHasProperty(N, SDNodeInfo::SDNPHasChain, ISE);
bool HasInFlag = NodeHasProperty(N, SDNodeInfo::SDNPInFlag, ISE);
for (unsigned i = 0, e = N->getNumChildren(); i != e; ++i, ++OpNo) {
TreePatternNode *Child = N->getChild(i);
if (!Child->isLeaf()) {
EmitInFlagSelectCode(Child, RootName + utostr(OpNo), ChainEmitted);
} else {
if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
if (!Child->getName().empty()) {
std::string Name = RootName + utostr(OpNo);
if (Duplicates.find(Name) != Duplicates.end())
// A duplicate! Do not emit a copy for this node.
continue;
}
Record *RR = DI->getDef();
if (RR->isSubClassOf("Register")) {
MVT::ValueType RVT = getRegisterValueType(RR, T);
if (RVT == MVT::Flag) {
emitCode("Select(InFlag, " + RootName + utostr(OpNo) + ");");
} else {
if (!ChainEmitted) {
emitDecl("Chain");
emitCode("Chain = CurDAG->getEntryNode();");
ChainName = "Chain";
ChainEmitted = true;
}
emitCode("Select(" + RootName + utostr(OpNo) + ", " +
RootName + utostr(OpNo) + ");");
emitCode("ResNode = CurDAG->getCopyToReg(" + ChainName +
", CurDAG->getRegister(" + ISE.getQualifiedName(RR) +
", " + getEnumName(RVT) + "), " +
RootName + utostr(OpNo) + ", InFlag).Val;");
emitCode(ChainName + " = SDOperand(ResNode, 0);");
emitCode("InFlag = SDOperand(ResNode, 1);");
}
}
}
}
}
if (HasInFlag)
emitCode("Select(InFlag, " + RootName +
".getOperand(" + utostr(OpNo) + "));");
}
/// EmitCopyFromRegs - Emit code to copy result to physical registers
/// as specified by the instruction. It returns true if any copy is
/// emitted.
bool EmitCopyFromRegs(TreePatternNode *N, bool &ChainEmitted) {
bool RetVal = false;
Record *Op = N->getOperator();
if (Op->isSubClassOf("Instruction")) {
const DAGInstruction &Inst = ISE.getInstruction(Op);
const CodeGenTarget &CGT = ISE.getTargetInfo();
unsigned NumImpResults = Inst.getNumImpResults();
for (unsigned i = 0; i < NumImpResults; i++) {
Record *RR = Inst.getImpResult(i);
if (RR->isSubClassOf("Register")) {
MVT::ValueType RVT = getRegisterValueType(RR, CGT);
if (RVT != MVT::Flag) {
if (!ChainEmitted) {
emitDecl("Chain");
emitCode("Chain = CurDAG->getEntryNode();");
ChainEmitted = true;
ChainName = "Chain";
}
emitCode("ResNode = CurDAG->getCopyFromReg(" + ChainName +
", " + ISE.getQualifiedName(RR) + ", " + getEnumName(RVT) +
", InFlag).Val;");
emitCode(ChainName + " = SDOperand(ResNode, 1);");
emitCode("InFlag = SDOperand(ResNode, 2);");
RetVal = true;
}
}
}
}
return RetVal;
}
};
/// 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. Returns true if the pattern is not guaranteed to match.
void DAGISelEmitter::GenerateCodeForPattern(PatternToMatch &Pattern,
std::vector<std::pair<bool, std::string> > &GeneratedCode,
std::set<std::pair<unsigned, std::string> > &GeneratedDecl,
std::vector<std::string> &TargetOpcodes,
std::vector<std::string> &TargetVTs,
bool DoReplace) {
PatternCodeEmitter Emitter(*this, Pattern.getPredicates(),
Pattern.getSrcPattern(), Pattern.getDstPattern(),
GeneratedCode, GeneratedDecl,
TargetOpcodes, TargetVTs,
DoReplace);
// Emit the matcher, capturing named arguments in VariableMap.
bool FoundChain = false;
Emitter.EmitMatchCode(Pattern.getSrcPattern(), NULL, "N", "", "", FoundChain);
// TP - Get *SOME* tree pattern, we don't care which.
TreePattern &TP = *PatternFragments.begin()->second;
// At this point, we know that we structurally match the pattern, but the
// types of the nodes may not match. Figure out the fewest number of type
// comparisons we need to emit. For example, if there is only one integer
// type supported by a target, there should be no type comparisons at all for
// integer patterns!
//
// To figure out the fewest number of type checks needed, clone the pattern,
// remove the types, then perform type inference on the pattern as a whole.
// If there are unresolved types, emit an explicit check for those types,
// apply the type to the tree, then rerun type inference. Iterate until all
// types are resolved.
//
TreePatternNode *Pat = Pattern.getSrcPattern()->clone();
RemoveAllTypes(Pat);
do {
// Resolve/propagate as many types as possible.
try {
bool MadeChange = true;
while (MadeChange)
MadeChange = Pat->ApplyTypeConstraints(TP,
true/*Ignore reg constraints*/);
} catch (...) {
assert(0 && "Error: could not find consistent types for something we"
" already decided was ok!");
abort();
}
// Insert a check for an unresolved type and add it to the tree. If we find
// an unresolved type to add a check for, this returns true and we iterate,
// otherwise we are done.
} while (Emitter.InsertOneTypeCheck(Pat, Pattern.getSrcPattern(), "N"));
Emitter.EmitResultCode(Pattern.getDstPattern(), false, true /*the root*/);
delete Pat;
}
/// EraseCodeLine - Erase one code line from all of the patterns. If removing
/// a line causes any of them to be empty, remove them and return true when
/// done.
static bool EraseCodeLine(std::vector<std::pair<PatternToMatch*,
std::vector<std::pair<bool, std::string> > > >
&Patterns) {
bool ErasedPatterns = false;
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
Patterns[i].second.pop_back();
if (Patterns[i].second.empty()) {
Patterns.erase(Patterns.begin()+i);
--i; --e;
ErasedPatterns = true;
}
}
return ErasedPatterns;
}
/// EmitPatterns - Emit code for at least one pattern, but try to group common
/// code together between the patterns.
void DAGISelEmitter::EmitPatterns(std::vector<std::pair<PatternToMatch*,
std::vector<std::pair<bool, std::string> > > >
&Patterns, unsigned Indent,
std::ostream &OS) {
typedef std::pair<bool, std::string> CodeLine;
typedef std::vector<CodeLine> CodeList;
typedef std::vector<std::pair<PatternToMatch*, CodeList> > PatternList;
if (Patterns.empty()) return;
// Figure out how many patterns share the next code line. Explicitly copy
// FirstCodeLine so that we don't invalidate a reference when changing
// Patterns.
const CodeLine FirstCodeLine = Patterns.back().second.back();
unsigned LastMatch = Patterns.size()-1;
while (LastMatch != 0 && Patterns[LastMatch-1].second.back() == FirstCodeLine)
--LastMatch;
// If not all patterns share this line, split the list into two pieces. The
// first chunk will use this line, the second chunk won't.
if (LastMatch != 0) {
PatternList Shared(Patterns.begin()+LastMatch, Patterns.end());
PatternList Other(Patterns.begin(), Patterns.begin()+LastMatch);
// FIXME: Emit braces?
if (Shared.size() == 1) {
PatternToMatch &Pattern = *Shared.back().first;
OS << "\n" << std::string(Indent, ' ') << "// Pattern: ";
Pattern.getSrcPattern()->print(OS);
OS << "\n" << std::string(Indent, ' ') << "// Emits: ";
Pattern.getDstPattern()->print(OS);
OS << "\n";
unsigned AddedComplexity = Pattern.getAddedComplexity();
OS << std::string(Indent, ' ') << "// Pattern complexity = "
<< getPatternSize(Pattern.getSrcPattern(), *this) + AddedComplexity
<< " cost = "
<< getResultPatternCost(Pattern.getDstPattern(), *this)
<< " size = "
<< getResultPatternSize(Pattern.getDstPattern(), *this) << "\n";
}
if (!FirstCodeLine.first) {
OS << std::string(Indent, ' ') << "{\n";
Indent += 2;
}
EmitPatterns(Shared, Indent, OS);
if (!FirstCodeLine.first) {
Indent -= 2;
OS << std::string(Indent, ' ') << "}\n";
}
if (Other.size() == 1) {
PatternToMatch &Pattern = *Other.back().first;
OS << "\n" << std::string(Indent, ' ') << "// Pattern: ";
Pattern.getSrcPattern()->print(OS);
OS << "\n" << std::string(Indent, ' ') << "// Emits: ";
Pattern.getDstPattern()->print(OS);
OS << "\n";
unsigned AddedComplexity = Pattern.getAddedComplexity();
OS << std::string(Indent, ' ') << "// Pattern complexity = "
<< getPatternSize(Pattern.getSrcPattern(), *this) + AddedComplexity
<< " cost = "
<< getResultPatternCost(Pattern.getDstPattern(), *this) << "\n";
}
EmitPatterns(Other, Indent, OS);
return;
}
// Remove this code from all of the patterns that share it.
bool ErasedPatterns = EraseCodeLine(Patterns);
bool isPredicate = FirstCodeLine.first;
// Otherwise, every pattern in the list has this line. Emit it.
if (!isPredicate) {
// Normal code.
OS << std::string(Indent, ' ') << FirstCodeLine.second << "\n";
} else {
OS << std::string(Indent, ' ') << "if (" << FirstCodeLine.second;
// If the next code line is another predicate, and if all of the pattern
// in this group share the same next line, emit it inline now. Do this
// until we run out of common predicates.
while (!ErasedPatterns && Patterns.back().second.back().first) {
// Check that all of fhe patterns in Patterns end with the same predicate.
bool AllEndWithSamePredicate = true;
for (unsigned i = 0, e = Patterns.size(); i != e; ++i)
if (Patterns[i].second.back() != Patterns.back().second.back()) {
AllEndWithSamePredicate = false;
break;
}
// If all of the predicates aren't the same, we can't share them.
if (!AllEndWithSamePredicate) break;
// Otherwise we can. Emit it shared now.
OS << " &&\n" << std::string(Indent+4, ' ')
<< Patterns.back().second.back().second;
ErasedPatterns = EraseCodeLine(Patterns);
}
OS << ") {\n";
Indent += 2;
}
EmitPatterns(Patterns, Indent, OS);
if (isPredicate)
OS << std::string(Indent-2, ' ') << "}\n";
}
namespace {
/// CompareByRecordName - An ordering predicate that implements less-than by
/// comparing the names records.
struct CompareByRecordName {
bool operator()(const Record *LHS, const Record *RHS) const {
// Sort by name first.
if (LHS->getName() < RHS->getName()) return true;
// If both names are equal, sort by pointer.
return LHS->getName() == RHS->getName() && LHS < RHS;
}
};
}
void DAGISelEmitter::EmitInstructionSelector(std::ostream &OS) {
std::string InstNS = Target.inst_begin()->second.Namespace;
if (!InstNS.empty()) InstNS += "::";
// Group the patterns by their top-level opcodes.
std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName> PatternsByOpcode;
// All unique target node emission functions.
std::map<std::string, unsigned> EmitFunctions;
for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
TreePatternNode *Node = PatternsToMatch[i].getSrcPattern();
if (!Node->isLeaf()) {
PatternsByOpcode[Node->getOperator()].push_back(&PatternsToMatch[i]);
} else {
const ComplexPattern *CP;
if (IntInit *II =
dynamic_cast<IntInit*>(Node->getLeafValue())) {
PatternsByOpcode[getSDNodeNamed("imm")].push_back(&PatternsToMatch[i]);
} else if ((CP = NodeGetComplexPattern(Node, *this))) {
std::vector<Record*> OpNodes = CP->getRootNodes();
for (unsigned j = 0, e = OpNodes.size(); j != e; j++) {
PatternsByOpcode[OpNodes[j]]
.insert(PatternsByOpcode[OpNodes[j]].begin(), &PatternsToMatch[i]);
}
} else {
std::cerr << "Unrecognized opcode '";
Node->dump();
std::cerr << "' on tree pattern '";
std::cerr <<
PatternsToMatch[i].getDstPattern()->getOperator()->getName();
std::cerr << "'!\n";
exit(1);
}
}
}
// Emit one Select_* method for each top-level opcode. We do this instead of
// emitting one giant switch statement to support compilers where this will
// result in the recursive functions taking less stack space.
for (std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName>::iterator PBOI = PatternsByOpcode.begin(),
E = PatternsByOpcode.end(); PBOI != E; ++PBOI) {
const std::string &OpName = PBOI->first->getName();
const SDNodeInfo &OpcodeInfo = getSDNodeInfo(PBOI->first);
bool OptSlctOrder =
(OpcodeInfo.hasProperty(SDNodeInfo::SDNPHasChain) &&
OpcodeInfo.getNumResults() > 0);
std::vector<PatternToMatch*> &Patterns = PBOI->second;
assert(!Patterns.empty() && "No patterns but map has entry?");
// We want to emit all of the matching code now. However, we want to emit
// the matches in order of minimal cost. Sort the patterns so the least
// cost one is at the start.
std::stable_sort(Patterns.begin(), Patterns.end(),
PatternSortingPredicate(*this));
typedef std::vector<std::pair<bool, std::string> > CodeList;
typedef std::vector<std::pair<bool, std::string> >::iterator CodeListI;
std::vector<std::pair<PatternToMatch*, CodeList> > CodeForPatterns;
std::vector<std::vector<std::string> > PatternOpcodes;
std::vector<std::vector<std::string> > PatternVTs;
std::vector<std::set<std::pair<unsigned, std::string> > > PatternDecls;
std::set<std::pair<unsigned, std::string> > AllGenDecls;
for (unsigned i = 0, e = Patterns.size(); i != e; ++i) {
CodeList GeneratedCode;
std::set<std::pair<unsigned, std::string> > GeneratedDecl;
std::vector<std::string> TargetOpcodes;
std::vector<std::string> TargetVTs;
GenerateCodeForPattern(*Patterns[i], GeneratedCode, GeneratedDecl,
TargetOpcodes, TargetVTs, OptSlctOrder);
for (std::set<std::pair<unsigned, std::string> >::iterator
si = GeneratedDecl.begin(), se = GeneratedDecl.end(); si!=se; ++si)
AllGenDecls.insert(*si);
CodeForPatterns.push_back(std::make_pair(Patterns[i], GeneratedCode));
PatternDecls.push_back(GeneratedDecl);
PatternOpcodes.push_back(TargetOpcodes);
PatternVTs.push_back(TargetVTs);
}
// Scan the code to see if all of the patterns are reachable and if it is
// possible that the last one might not match.
bool mightNotMatch = true;
for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
CodeList &GeneratedCode = CodeForPatterns[i].second;
mightNotMatch = false;
for (unsigned j = 0, e = GeneratedCode.size(); j != e; ++j) {
if (GeneratedCode[j].first) { // predicate.
mightNotMatch = true;
break;
}
}
// If this pattern definitely matches, and if it isn't the last one, the
// patterns after it CANNOT ever match. Error out.
if (mightNotMatch == false && i != CodeForPatterns.size()-1) {
std::cerr << "Pattern '";
CodeForPatterns[i+1].first->getSrcPattern()->print(OS);
std::cerr << "' is impossible to select!\n";
exit(1);
}
}
// Factor target node emission code (emitted by EmitResultCode) into
// separate functions. Uniquing and share them among all instruction
// selection routines.
for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
CodeList &GeneratedCode = CodeForPatterns[i].second;
std::vector<std::string> &TargetOpcodes = PatternOpcodes[i];
std::vector<std::string> &TargetVTs = PatternVTs[i];
std::set<std::pair<unsigned, std::string> > Decls = PatternDecls[i];
int CodeSize = (int)GeneratedCode.size();
int LastPred = -1;
for (int j = CodeSize-1; j >= 0; --j) {
if (GeneratedCode[j].first) {
LastPred = j;
break;
}
}
std::string CalleeDecls;
std::string CalleeCode = "(SDOperand &Result, SDOperand &N";
std::string CallerCode = "(Result, N";
for (unsigned j = 0, e = TargetOpcodes.size(); j != e; ++j) {
CalleeCode += ", unsigned Opc" + utostr(j);
CallerCode += ", " + TargetOpcodes[j];
}
for (unsigned j = 0, e = TargetVTs.size(); j != e; ++j) {
CalleeCode += ", MVT::ValueType VT" + utostr(j);
CallerCode += ", " + TargetVTs[j];
}
for (std::set<std::pair<unsigned, std::string> >::iterator
I = Decls.begin(), E = Decls.end(); I != E; ++I) {
std::string Name = I->second;
if (I->first == 0) {
if (Name == "InFlag" ||
(Name.size() > 3 &&
Name[0] == 'T' && Name[1] == 'm' && Name[2] == 'p')) {
CalleeDecls += " SDOperand " + Name + "(0, 0);\n";
continue;
}
CalleeCode += ", SDOperand &" + Name;
CallerCode += ", " + Name;
} else if (I->first == 1) {
if (Name == "ResNode") {
CalleeDecls += " SDNode *" + Name + " = NULL;\n";
continue;
}
CalleeCode += ", SDNode *" + Name;
CallerCode += ", " + Name;
} else {
CalleeCode += ", bool " + Name;
CallerCode += ", " + Name;
}
}
CallerCode += ");";
CalleeCode += ") ";
#ifdef __GNUC__
// Prevent emission routines from being inlined to reduce selection
// routines stack frame sizes.
CalleeCode += "__attribute__((noinline)) ";
#endif
CalleeCode += "{\n" + CalleeDecls;
for (int j = LastPred+1; j < CodeSize; ++j)
CalleeCode += " " + GeneratedCode[j].second + '\n';
for (int j = LastPred+1; j < CodeSize; ++j)
GeneratedCode.pop_back();
CalleeCode += "}\n";
// Uniquing the emission routines.
unsigned EmitFuncNum;
std::map<std::string, unsigned>::iterator EFI =
EmitFunctions.find(CalleeCode);
if (EFI != EmitFunctions.end()) {
EmitFuncNum = EFI->second;
} else {
EmitFuncNum = EmitFunctions.size();
EmitFunctions.insert(std::make_pair(CalleeCode, EmitFuncNum));
OS << "void " << "Emit_" << utostr(EmitFuncNum) << CalleeCode;
}
// Replace the emission code within selection routines with calls to the
// emission functions.
CallerCode = "Emit_" + utostr(EmitFuncNum) + CallerCode;
GeneratedCode.push_back(std::make_pair(false, CallerCode));
GeneratedCode.push_back(std::make_pair(false, "return;"));
}
// Print function.
OS << "void Select_" << OpName << "(SDOperand &Result, SDOperand N) {\n";
if (OptSlctOrder) {
OS << " if (N.ResNo == " << OpcodeInfo.getNumResults()
<< " && N.getValue(0).hasOneUse()) {\n"
<< " SDOperand Dummy = "
<< "CurDAG->getNode(ISD::HANDLENODE, MVT::Other, N);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, "
<< OpcodeInfo.getNumResults() << ", Dummy.Val, 0);\n"
<< " SelectionDAG::InsertISelMapEntry(HandleMap, N.Val, "
<< OpcodeInfo.getNumResults() << ", Dummy.Val, 0);\n"
<< " Result = Dummy;\n"
<< " return;\n"
<< " }\n";
}
// Print all declarations.
for (std::set<std::pair<unsigned, std::string> >::iterator
I = AllGenDecls.begin(), E = AllGenDecls.end(); I != E; ++I)
if (I->first == 0)
OS << " SDOperand " << I->second << "(0, 0);\n";
else if (I->first == 1)
OS << " SDNode *" << I->second << " = NULL;\n";
else
OS << " bool " << I->second << " = false;\n";
// Loop through and reverse all of the CodeList vectors, as we will be
// accessing them from their logical front, but accessing the end of a
// vector is more efficient.
for (unsigned i = 0, e = CodeForPatterns.size(); i != e; ++i) {
CodeList &GeneratedCode = CodeForPatterns[i].second;
std::reverse(GeneratedCode.begin(), GeneratedCode.end());
}
// Next, reverse the list of patterns itself for the same reason.
std::reverse(CodeForPatterns.begin(), CodeForPatterns.end());
// Emit all of the patterns now, grouped together to share code.
EmitPatterns(CodeForPatterns, 2, OS);
// If the last pattern has predicates (which could fail) emit code to catch
// the case where nothing handles a pattern.
if (mightNotMatch) {
OS << " std::cerr << \"Cannot yet select: \";\n";
if (OpcodeInfo.getEnumName() != "ISD::INTRINSIC_W_CHAIN" &&
OpcodeInfo.getEnumName() != "ISD::INTRINSIC_WO_CHAIN" &&
OpcodeInfo.getEnumName() != "ISD::INTRINSIC_VOID") {
OS << " N.Val->dump(CurDAG);\n";
} else {
OS << " unsigned iid = cast<ConstantSDNode>(N.getOperand("
"N.getOperand(0).getValueType() == MVT::Other))->getValue();\n"
<< " std::cerr << \"intrinsic %\"<< "
"Intrinsic::getName((Intrinsic::ID)iid);\n";
}
OS << " std::cerr << '\\n';\n"
<< " abort();\n";
}
OS << "}\n\n";
}
// Emit boilerplate.
OS << "void Select_INLINEASM(SDOperand& Result, SDOperand N) {\n"
<< " std::vector<SDOperand> Ops(N.Val->op_begin(), N.Val->op_end());\n"
<< " Select(Ops[0], N.getOperand(0)); // Select the chain.\n\n"
<< " // Select the flag operand.\n"
<< " if (Ops.back().getValueType() == MVT::Flag)\n"
<< " Select(Ops.back(), Ops.back());\n"
<< " SelectInlineAsmMemoryOperands(Ops, *CurDAG);\n"
<< " std::vector<MVT::ValueType> VTs;\n"
<< " VTs.push_back(MVT::Other);\n"
<< " VTs.push_back(MVT::Flag);\n"
<< " SDOperand New = CurDAG->getNode(ISD::INLINEASM, VTs, Ops);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 0, New.Val, 0);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 1, New.Val, 1);\n"
<< " Result = New.getValue(N.ResNo);\n"
<< " return;\n"
<< "}\n\n";
OS << "// The main instruction selector code.\n"
<< "void SelectCode(SDOperand &Result, SDOperand N) {\n"
<< " if (N.getOpcode() >= ISD::BUILTIN_OP_END &&\n"
<< " N.getOpcode() < (ISD::BUILTIN_OP_END+" << InstNS
<< "INSTRUCTION_LIST_END)) {\n"
<< " Result = N;\n"
<< " return; // Already selected.\n"
<< " }\n\n"
<< " std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(N);\n"
<< " if (CGMI != CodeGenMap.end()) {\n"
<< " Result = CGMI->second;\n"
<< " return;\n"
<< " }\n\n"
<< " switch (N.getOpcode()) {\n"
<< " default: break;\n"
<< " case ISD::EntryToken: // These leaves remain the same.\n"
<< " case ISD::BasicBlock:\n"
<< " case ISD::Register:\n"
<< " case ISD::HANDLENODE:\n"
<< " case ISD::TargetConstant:\n"
<< " case ISD::TargetConstantPool:\n"
<< " case ISD::TargetFrameIndex:\n"
<< " case ISD::TargetJumpTable:\n"
<< " case ISD::TargetGlobalAddress: {\n"
<< " Result = N;\n"
<< " return;\n"
<< " }\n"
<< " case ISD::AssertSext:\n"
<< " case ISD::AssertZext: {\n"
<< " SDOperand Tmp0;\n"
<< " Select(Tmp0, N.getOperand(0));\n"
<< " if (!N.Val->hasOneUse())\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, N.ResNo, "
<< "Tmp0.Val, Tmp0.ResNo);\n"
<< " Result = Tmp0;\n"
<< " return;\n"
<< " }\n"
<< " case ISD::TokenFactor:\n"
<< " if (N.getNumOperands() == 2) {\n"
<< " SDOperand Op0, Op1;\n"
<< " Select(Op0, N.getOperand(0));\n"
<< " Select(Op1, N.getOperand(1));\n"
<< " Result = \n"
<< " CurDAG->getNode(ISD::TokenFactor, MVT::Other, Op0, Op1);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, N.ResNo, "
<< "Result.Val, Result.ResNo);\n"
<< " } else {\n"
<< " std::vector<SDOperand> Ops;\n"
<< " for (unsigned i = 0, e = N.getNumOperands(); i != e; ++i) {\n"
<< " SDOperand Val;\n"
<< " Select(Val, N.getOperand(i));\n"
<< " Ops.push_back(Val);\n"
<< " }\n"
<< " Result = \n"
<< " CurDAG->getNode(ISD::TokenFactor, MVT::Other, Ops);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, N.ResNo, "
<< "Result.Val, Result.ResNo);\n"
<< " }\n"
<< " return;\n"
<< " case ISD::CopyFromReg: {\n"
<< " SDOperand Chain;\n"
<< " Select(Chain, N.getOperand(0));\n"
<< " unsigned Reg = cast<RegisterSDNode>(N.getOperand(1))->getReg();\n"
<< " MVT::ValueType VT = N.Val->getValueType(0);\n"
<< " if (N.Val->getNumValues() == 2) {\n"
<< " if (Chain == N.getOperand(0)) {\n"
<< " Result = N; // No change\n"
<< " return;\n"
<< " }\n"
<< " SDOperand New = CurDAG->getCopyFromReg(Chain, Reg, VT);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 0, "
<< "New.Val, 0);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 1, "
<< "New.Val, 1);\n"
<< " Result = New.getValue(N.ResNo);\n"
<< " return;\n"
<< " } else {\n"
<< " SDOperand Flag;\n"
<< " if (N.getNumOperands() == 3) Select(Flag, N.getOperand(2));\n"
<< " if (Chain == N.getOperand(0) &&\n"
<< " (N.getNumOperands() == 2 || Flag == N.getOperand(2))) {\n"
<< " Result = N; // No change\n"
<< " return;\n"
<< " }\n"
<< " SDOperand New = CurDAG->getCopyFromReg(Chain, Reg, VT, Flag);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 0, "
<< "New.Val, 0);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 1, "
<< "New.Val, 1);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 2, "
<< "New.Val, 2);\n"
<< " Result = New.getValue(N.ResNo);\n"
<< " return;\n"
<< " }\n"
<< " }\n"
<< " case ISD::CopyToReg: {\n"
<< " SDOperand Chain;\n"
<< " Select(Chain, N.getOperand(0));\n"
<< " unsigned Reg = cast<RegisterSDNode>(N.getOperand(1))->getReg();\n"
<< " SDOperand Val;\n"
<< " Select(Val, N.getOperand(2));\n"
<< " Result = N;\n"
<< " if (N.Val->getNumValues() == 1) {\n"
<< " if (Chain != N.getOperand(0) || Val != N.getOperand(2))\n"
<< " Result = CurDAG->getCopyToReg(Chain, Reg, Val);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 0, "
<< "Result.Val, 0);\n"
<< " } else {\n"
<< " SDOperand Flag(0, 0);\n"
<< " if (N.getNumOperands() == 4) Select(Flag, N.getOperand(3));\n"
<< " if (Chain != N.getOperand(0) || Val != N.getOperand(2) ||\n"
<< " (N.getNumOperands() == 4 && Flag != N.getOperand(3)))\n"
<< " Result = CurDAG->getCopyToReg(Chain, Reg, Val, Flag);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 0, "
<< "Result.Val, 0);\n"
<< " SelectionDAG::InsertISelMapEntry(CodeGenMap, N.Val, 1, "
<< "Result.Val, 1);\n"
<< " Result = Result.getValue(N.ResNo);\n"
<< " }\n"
<< " return;\n"
<< " }\n"
<< " case ISD::INLINEASM: Select_INLINEASM(Result, N); return;\n";
// Loop over all of the case statements, emiting a call to each method we
// emitted above.
for (std::map<Record*, std::vector<PatternToMatch*>,
CompareByRecordName>::iterator PBOI = PatternsByOpcode.begin(),
E = PatternsByOpcode.end(); PBOI != E; ++PBOI) {
const SDNodeInfo &OpcodeInfo = getSDNodeInfo(PBOI->first);
OS << " case " << OpcodeInfo.getEnumName() << ": "
<< std::string(std::max(0, int(24-OpcodeInfo.getEnumName().size())), ' ')
<< "Select_" << PBOI->first->getName() << "(Result, N); return;\n";
}
OS << " } // end of big switch.\n\n"
<< " std::cerr << \"Cannot yet select: \";\n"
<< " if (N.getOpcode() != ISD::INTRINSIC_W_CHAIN &&\n"
<< " N.getOpcode() != ISD::INTRINSIC_WO_CHAIN &&\n"
<< " N.getOpcode() != ISD::INTRINSIC_VOID) {\n"
<< " N.Val->dump(CurDAG);\n"
<< " } else {\n"
<< " unsigned iid = cast<ConstantSDNode>(N.getOperand("
"N.getOperand(0).getValueType() == MVT::Other))->getValue();\n"
<< " std::cerr << \"intrinsic %\"<< "
"Intrinsic::getName((Intrinsic::ID)iid);\n"
<< " }\n"
<< " std::cerr << '\\n';\n"
<< " abort();\n"
<< "}\n";
}
void DAGISelEmitter::run(std::ostream &OS) {
EmitSourceFileHeader("DAG Instruction Selector for the " + Target.getName() +
" target", OS);
OS << "// *** NOTE: This file is #included into the middle of the target\n"
<< "// *** instruction selector class. These functions are really "
<< "methods.\n\n";
OS << "// Instance var to keep track of multiply used nodes that have \n"
<< "// already been selected.\n"
<< "std::map<SDOperand, SDOperand> CodeGenMap;\n";
OS << "// Instance var to keep track of mapping of chain generating nodes\n"
<< "// and their place handle nodes.\n";
OS << "std::map<SDOperand, SDOperand> HandleMap;\n";
OS << "// Instance var to keep track of mapping of place handle nodes\n"
<< "// and their replacement nodes.\n";
OS << "std::map<SDOperand, SDOperand> ReplaceMap;\n";
OS << "// Keep track of nodes that are currently being selecte and therefore\n"
<< "// should not be folded.\n";
OS << "std::set<SDNode*> InFlightSet;\n";
OS << "\n";
OS << "static void findNonImmUse(SDNode* Use, SDNode* Def, bool &found, "
<< "std::set<SDNode *> &Visited) {\n";
OS << " if (found || !Visited.insert(Use).second) return;\n";
OS << " for (unsigned i = 0, e = Use->getNumOperands(); i != e; ++i) {\n";
OS << " SDNode *N = Use->getOperand(i).Val;\n";
OS << " if (N != Def) {\n";
OS << " findNonImmUse(N, Def, found, Visited);\n";
OS << " } else {\n";
OS << " found = true;\n";
OS << " break;\n";
OS << " }\n";
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "static bool isNonImmUse(SDNode* Use, SDNode* Def) {\n";
OS << " std::set<SDNode *> Visited;\n";
OS << " bool found = false;\n";
OS << " for (unsigned i = 0, e = Use->getNumOperands(); i != e; ++i) {\n";
OS << " SDNode *N = Use->getOperand(i).Val;\n";
OS << " if (N != Def) {\n";
OS << " findNonImmUse(N, Def, found, Visited);\n";
OS << " if (found) break;\n";
OS << " }\n";
OS << " }\n";
OS << " return found;\n";
OS << "}\n";
OS << "\n";
OS << "// AddHandleReplacement - Note the pending replacement node for a\n"
<< "// handle node in ReplaceMap.\n";
OS << "void AddHandleReplacement(SDNode *H, unsigned HNum, SDNode *R, "
<< "unsigned RNum) {\n";
OS << " SDOperand N(H, HNum);\n";
OS << " std::map<SDOperand, SDOperand>::iterator HMI = HandleMap.find(N);\n";
OS << " if (HMI != HandleMap.end()) {\n";
OS << " ReplaceMap[HMI->second] = SDOperand(R, RNum);\n";
OS << " HandleMap.erase(N);\n";
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "// SelectDanglingHandles - Select replacements for all `dangling`\n";
OS << "// handles.Some handles do not yet have replacements because the\n";
OS << "// nodes they replacements have only dead readers.\n";
OS << "void SelectDanglingHandles() {\n";
OS << " for (std::map<SDOperand, SDOperand>::iterator I = "
<< "HandleMap.begin(),\n"
<< " E = HandleMap.end(); I != E; ++I) {\n";
OS << " SDOperand N = I->first;\n";
OS << " SDOperand R;\n";
OS << " Select(R, N.getValue(0));\n";
OS << " AddHandleReplacement(N.Val, N.ResNo, R.Val, R.ResNo);\n";
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "// ReplaceHandles - Replace all the handles with the real target\n";
OS << "// specific nodes.\n";
OS << "void ReplaceHandles() {\n";
OS << " for (std::map<SDOperand, SDOperand>::iterator I = "
<< "ReplaceMap.begin(),\n"
<< " E = ReplaceMap.end(); I != E; ++I) {\n";
OS << " SDOperand From = I->first;\n";
OS << " SDOperand To = I->second;\n";
OS << " for (SDNode::use_iterator UI = From.Val->use_begin(), "
<< "E = From.Val->use_end(); UI != E; ++UI) {\n";
OS << " SDNode *Use = *UI;\n";
OS << " std::vector<SDOperand> Ops;\n";
OS << " for (unsigned i = 0, e = Use->getNumOperands(); i != e; ++i){\n";
OS << " SDOperand O = Use->getOperand(i);\n";
OS << " if (O.Val == From.Val)\n";
OS << " Ops.push_back(To);\n";
OS << " else\n";
OS << " Ops.push_back(O);\n";
OS << " }\n";
OS << " SDOperand U = SDOperand(Use, 0);\n";
OS << " CurDAG->UpdateNodeOperands(U, Ops);\n";
OS << " }\n";
OS << " }\n";
OS << "}\n";
OS << "\n";
OS << "// UpdateFoldedChain - return a SDOperand of the new chain created\n";
OS << "// if the folding were to happen. This is called when, for example,\n";
OS << "// a load is folded into a store. If the store's chain is the load,\n";
OS << "// then the resulting node's input chain would be the load's input\n";
OS << "// chain. If the store's chain is a TokenFactor and the load's\n";
OS << "// output chain feeds into in, then the new chain is a TokenFactor\n";
OS << "// with the other operands along with the input chain of the load.\n";
OS << "SDOperand UpdateFoldedChain(SelectionDAG *DAG, SDNode *N, "
<< "SDNode *Chain, SDNode* &OldTF) {\n";
OS << " OldTF = NULL;\n";
OS << " if (N == Chain) {\n";
OS << " return N->getOperand(0);\n";
OS << " } else if (Chain->getOpcode() == ISD::TokenFactor &&\n";
OS << " N->isOperand(Chain)) {\n";
OS << " SDOperand Ch = SDOperand(Chain, 0);\n";
OS << " std::map<SDOperand, SDOperand>::iterator CGMI = "
<< "CodeGenMap.find(Ch);\n";
OS << " if (CGMI != CodeGenMap.end())\n";
OS << " return SDOperand(0, 0);\n";
OS << " OldTF = Chain;\n";
OS << " std::vector<SDOperand> Ops;\n";
OS << " for (unsigned i = 0; i < Chain->getNumOperands(); ++i) {\n";
OS << " SDOperand Op = Chain->getOperand(i);\n";
OS << " if (Op.Val == N)\n";
OS << " Ops.push_back(N->getOperand(0));\n";
OS << " else\n";
OS << " Ops.push_back(Op);\n";
OS << " }\n";
OS << " return DAG->getNode(ISD::TokenFactor, MVT::Other, Ops);\n";
OS << " }\n";
OS << " return SDOperand(0, 0);\n";
OS << "}\n";
OS << "\n";
OS << "// SelectRoot - Top level entry to DAG isel.\n";
OS << "SDOperand SelectRoot(SDOperand N) {\n";
OS << " SDOperand ResNode;\n";
OS << " Select(ResNode, N);\n";
OS << " SelectDanglingHandles();\n";
OS << " ReplaceHandles();\n";
OS << " ReplaceMap.clear();\n";
OS << " return ResNode;\n";
OS << "}\n";
Intrinsics = LoadIntrinsics(Records);
ParseNodeInfo();
ParseNodeTransforms(OS);
ParseComplexPatterns();
ParsePatternFragments(OS);
ParseInstructions();
ParsePatterns();
// Generate variants. For example, commutative patterns can match
// multiple ways. Add them to PatternsToMatch as well.
GenerateVariants();
DEBUG(std::cerr << "\n\nALL PATTERNS TO MATCH:\n\n";
for (unsigned i = 0, e = PatternsToMatch.size(); i != e; ++i) {
std::cerr << "PATTERN: "; PatternsToMatch[i].getSrcPattern()->dump();
std::cerr << "\nRESULT: ";PatternsToMatch[i].getDstPattern()->dump();
std::cerr << "\n";
});
// At this point, we have full information about the 'Patterns' we need to
// parse, both implicitly from instructions as well as from explicit pattern
// definitions. Emit the resultant instruction selector.
EmitInstructionSelector(OS);
for (std::map<Record*, TreePattern*>::iterator I = PatternFragments.begin(),
E = PatternFragments.end(); I != E; ++I)
delete I->second;
PatternFragments.clear();
Instructions.clear();
}
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