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TableGen: permit non-leaf ComplexPattern uses

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This allows the results of a ComplexPattern check to be distributed to separate
named Operands, instead of the current system where all results must apply (and
match perfectly) with a single Operand.

For example, if "some_addrmode" is a ComplexPattern producing two results, you
can write:

   def : Pat<(load (some_addrmode GPR64:$base, imm:$offset)),
             (INST GPR64:$base, imm:$offset)>;

This should allow neater instruction definitions in TableGen that don't put all
possible aspects of addressing into a single operand, but are still usable with
relatively simple C++ CodeGen idioms.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209206 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tim Northover
2014-05-20 11:52:46 +00:00
parent 57a98baa07
commit ee8d5c393e
4 changed files with 173 additions and 62 deletions
Download Patch File Download Diff File Expand all files Collapse all files
utils/TableGen/CodeGenDAGPatterns.cpp
+81 -15
View File
@@ -738,9 +738,13 @@ static unsigned getPatternSize(const TreePatternNode *P,
// 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 = P->getComplexPatternInfo(CGP);
if (AM)
if (AM) {
Size += AM->getNumOperands() * 3;
// We don't want to count any children twice, so return early.
return Size;
}
// If this node has some predicate function that must match, it adds to the
// complexity of this node.
if (!P->getPredicateFns().empty())
@@ -1122,6 +1126,9 @@ static unsigned GetNumNodeResults(Record *Operator, CodeGenDAGPatterns &CDP) {
if (Operator->isSubClassOf("ValueType"))
return 1; // A type-cast of one result.
if (Operator->isSubClassOf("ComplexPattern"))
return 1;
Operator->dump();
errs() << "Unhandled node in GetNumNodeResults\n";
exit(1);
@@ -1425,6 +1432,9 @@ static EEVT::TypeSet getImplicitType(Record *R, unsigned ResNo,
return EEVT::TypeSet(); // Unknown.
}
if (R->isSubClassOf("Operand"))
return EEVT::TypeSet(getValueType(R->getValueAsDef("Type")));
TP.error("Unknown node flavor used in pattern: " + R->getName());
return EEVT::TypeSet(MVT::Other, TP);
}
@@ -1447,12 +1457,37 @@ getIntrinsicInfo(const CodeGenDAGPatterns &CDP) const {
/// return the ComplexPattern information, otherwise return null.
const ComplexPattern *
TreePatternNode::getComplexPatternInfo(const CodeGenDAGPatterns &CGP) const {
if (!isLeaf()) return nullptr;
Record *Rec;
if (isLeaf()) {
DefInit *DI = dyn_cast<DefInit>(getLeafValue());
if (!DI)
return nullptr;
Rec = DI->getDef();
} else
Rec = getOperator();
DefInit *DI = dyn_cast<DefInit>(getLeafValue());
if (DI && DI->getDef()->isSubClassOf("ComplexPattern"))
return &CGP.getComplexPattern(DI->getDef());
return nullptr;
if (!Rec->isSubClassOf("ComplexPattern"))
return nullptr;
return &CGP.getComplexPattern(Rec);
}
unsigned TreePatternNode::getNumMIResults(const CodeGenDAGPatterns &CGP) const {
// A ComplexPattern specifically declares how many results it fills in.
if (const ComplexPattern *CP = getComplexPatternInfo(CGP))
return CP->getNumOperands();
// If MIOperandInfo is specified, that gives the count.
if (isLeaf()) {
DefInit *DI = dyn_cast<DefInit>(getLeafValue());
if (DI && DI->getDef()->isSubClassOf("Operand")) {
DagInit *MIOps = DI->getDef()->getValueAsDag("MIOperandInfo");
if (MIOps->getNumArgs())
return MIOps->getNumArgs();
}
}
// Otherwise there is just one result.
return 1;
}
/// NodeHasProperty - Return true if this node has the specified property.
@@ -1725,6 +1760,15 @@ bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
return MadeChange;
}
if (getOperator()->isSubClassOf("ComplexPattern")) {
bool MadeChange = false;
for (unsigned i = 0; i < getNumChildren(); ++i)
MadeChange |= getChild(i)->ApplyTypeConstraints(TP, NotRegisters);
return MadeChange;
}
assert(getOperator()->isSubClassOf("SDNodeXForm") && "Unknown node type!");
// Node transforms always take one operand.
@@ -1781,6 +1825,9 @@ bool TreePatternNode::canPatternMatch(std::string &Reason,
return true;
}
if (getOperator()->isSubClassOf("ComplexPattern"))
return true;
// If this node is a commutative operator, check that the LHS isn't an
// immediate.
const SDNodeInfo &NodeInfo = CDP.getSDNodeInfo(getOperator());
@@ -1927,6 +1974,7 @@ TreePatternNode *TreePattern::ParseTreePattern(Init *TheInit, StringRef OpName){
!Operator->isSubClassOf("Instruction") &&
!Operator->isSubClassOf("SDNodeXForm") &&
!Operator->isSubClassOf("Intrinsic") &&
!Operator->isSubClassOf("ComplexPattern") &&
Operator->getName() != "set" &&
Operator->getName() != "implicit")
error("Unrecognized node '" + Operator->getName() + "'!");
@@ -1982,6 +2030,27 @@ TreePatternNode *TreePattern::ParseTreePattern(Init *TheInit, StringRef OpName){
Children.insert(Children.begin(), IIDNode);
}
if (Operator->isSubClassOf("ComplexPattern")) {
for (unsigned i = 0; i < Children.size(); ++i) {
TreePatternNode *Child = Children[i];
if (Child->getName().empty())
error("All arguments to a ComplexPattern must be named");
// Check that the ComplexPattern uses are consistent: "(MY_PAT $a, $b)"
// and "(MY_PAT $b, $a)" should not be allowed in the same pattern;
// neither should "(MY_PAT_1 $a, $b)" and "(MY_PAT_2 $a, $b)".
auto OperandId = std::make_pair(Operator, i);
auto PrevOp = ComplexPatternOperands.find(Child->getName());
if (PrevOp != ComplexPatternOperands.end()) {
if (PrevOp->getValue() != OperandId)
error("All ComplexPattern operands must appear consistently: "
"in the same order in just one ComplexPattern instance.");
} else
ComplexPatternOperands[Child->getName()] = OperandId;
}
}
unsigned NumResults = GetNumNodeResults(Operator, CDP);
TreePatternNode *Result = new TreePatternNode(Operator, Children, NumResults);
Result->setName(OpName);
@@ -2553,14 +2622,11 @@ public:
return;
}
// Get information about the SDNode for the operator.
const SDNodeInfo &OpInfo = CDP.getSDNodeInfo(N->getOperator());
// Notice properties of the node.
if (OpInfo.hasProperty(SDNPMayStore)) mayStore = true;
if (OpInfo.hasProperty(SDNPMayLoad)) mayLoad = true;
if (OpInfo.hasProperty(SDNPSideEffect)) hasSideEffects = true;
if (OpInfo.hasProperty(SDNPVariadic)) isVariadic = true;
if (N->NodeHasProperty(SDNPMayStore, CDP)) mayStore = true;
if (N->NodeHasProperty(SDNPMayLoad, CDP)) mayLoad = true;
if (N->NodeHasProperty(SDNPSideEffect, CDP)) hasSideEffects = true;
if (N->NodeHasProperty(SDNPVariadic, CDP)) isVariadic = true;
if (const CodeGenIntrinsic *IntInfo = N->getIntrinsicInfo(CDP)) {
// If this is an intrinsic, analyze it.
@@ -3434,8 +3500,8 @@ static void GenerateVariantsOf(TreePatternNode *N,
std::vector<TreePatternNode*> &OutVariants,
CodeGenDAGPatterns &CDP,
const MultipleUseVarSet &DepVars) {
// We cannot permute leaves.
if (N->isLeaf()) {
// We cannot permute leaves or ComplexPattern uses.
if (N->isLeaf() || N->getOperator()->isSubClassOf("ComplexPattern")) {
OutVariants.push_back(N);
return;
}