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+//===- CodeGenDAGPatterns.h - Read DAG patterns from .td file ---*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the CodeGenDAGPatterns class, which is used to read and
+// represent the patterns present in a .td file for instructions.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CODEGEN_DAGPATTERNS_H
+#define CODEGEN_DAGPATTERNS_H
+
+#include <set>
+#include <algorithm>
+#include <vector>
+
+#include "CodeGenTarget.h"
+#include "CodeGenIntrinsics.h"
+
+namespace llvm {
+ class Record;
+ struct Init;
+ class ListInit;
+ class DagInit;
+ class SDNodeInfo;
+ class TreePattern;
+ class TreePatternNode;
+ class CodeGenDAGPatterns;
+ class ComplexPattern;
+
+/// EMVT::DAGISelGenValueType - These are some extended forms of
+/// MVT::SimpleValueType that we use as lattice values during type inference.
+namespace EMVT {
+ enum DAGISelGenValueType {
+ isFP = MVT::LAST_VALUETYPE,
+ isInt,
+ isUnknown
+ };
+
+ /// isExtIntegerVT - Return true if the specified extended value type vector
+ /// contains isInt or an integer value type.
+ bool isExtIntegerInVTs(const std::vector<unsigned char> &EVTs);
+
+ /// isExtFloatingPointVT - Return true if the specified extended value type
+ /// vector contains isFP or a FP value type.
+ bool isExtFloatingPointInVTs(const std::vector<unsigned char> &EVTs);
+}
+
+/// Set type used to track multiply used variables in patterns
+typedef std::set<std::string> MultipleUseVarSet;
+
+/// SDTypeConstraint - This is a discriminated union of constraints,
+/// corresponding to the SDTypeConstraint tablegen class in Target.td.
+struct SDTypeConstraint {
+ SDTypeConstraint(Record *R);
+
+ unsigned OperandNo; // The operand # this constraint applies to.
+ enum {
+ SDTCisVT, SDTCisPtrTy, SDTCisInt, SDTCisFP, SDTCisSameAs,
+ SDTCisVTSmallerThanOp, SDTCisOpSmallerThanOp, SDTCisEltOfVec
+ } ConstraintType;
+
+ union { // The discriminated union.
+ struct {
+ unsigned char VT;
+ } SDTCisVT_Info;
+ struct {
+ unsigned OtherOperandNum;
+ } SDTCisSameAs_Info;
+ struct {
+ unsigned OtherOperandNum;
+ } SDTCisVTSmallerThanOp_Info;
+ struct {
+ unsigned BigOperandNum;
+ } SDTCisOpSmallerThanOp_Info;
+ struct {
+ unsigned OtherOperandNum;
+ } SDTCisEltOfVec_Info;
+ } x;
+
+ /// 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 ApplyTypeConstraint(TreePatternNode *N, const SDNodeInfo &NodeInfo,
+ TreePattern &TP) const;
+
+ /// getOperandNum - Return the node corresponding to operand #OpNo in tree
+ /// N, which has NumResults results.
+ TreePatternNode *getOperandNum(unsigned OpNo, TreePatternNode *N,
+ unsigned NumResults) const;
+};
+
+/// SDNodeInfo - One of these records is created for each SDNode instance in
+/// the target .td file. This represents the various dag nodes we will be
+/// processing.
+class SDNodeInfo {
+ Record *Def;
+ std::string EnumName;
+ std::string SDClassName;
+ unsigned Properties;
+ unsigned NumResults;
+ int NumOperands;
+ std::vector<SDTypeConstraint> TypeConstraints;
+public:
+ SDNodeInfo(Record *R); // Parse the specified record.
+
+ unsigned getNumResults() const { return NumResults; }
+ int getNumOperands() const { return NumOperands; }
+ Record *getRecord() const { return Def; }
+ const std::string &getEnumName() const { return EnumName; }
+ const std::string &getSDClassName() const { return SDClassName; }
+
+ const std::vector<SDTypeConstraint> &getTypeConstraints() const {
+ return TypeConstraints;
+ }
+
+ /// hasProperty - Return true if this node has the specified property.
+ ///
+ bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
+
+ /// ApplyTypeConstraints - Given a node in a pattern, apply the type
+ /// constraints for this node to the operands of the node. This returns
+ /// true if it makes a change, false otherwise. If a type contradiction is
+ /// found, throw an exception.
+ bool ApplyTypeConstraints(TreePatternNode *N, TreePattern &TP) const {
+ bool MadeChange = false;
+ for (unsigned i = 0, e = TypeConstraints.size(); i != e; ++i)
+ MadeChange |= TypeConstraints[i].ApplyTypeConstraint(N, *this, TP);
+ return MadeChange;
+ }
+};
+
+/// FIXME: TreePatternNode's can be shared in some cases (due to dag-shaped
+/// patterns), and as such should be ref counted. We currently just leak all
+/// TreePatternNode objects!
+class TreePatternNode {
+ /// The inferred type for this node, or EMVT::isUnknown if it hasn't
+ /// been determined yet. This is a std::vector because during inference
+ /// there may be multiple possible types.
+ std::vector<unsigned char> Types;
+
+ /// Operator - The Record for the operator if this is an interior node (not
+ /// a leaf).
+ Record *Operator;
+
+ /// Val - The init value (e.g. the "GPRC" record, or "7") for a leaf.
+ ///
+ Init *Val;
+
+ /// Name - The name given to this node with the :$foo notation.
+ ///
+ std::string Name;
+
+ /// PredicateFns - The predicate functions to execute on this node to check
+ /// for a match. If this list is empty, no predicate is involved.
+ std::vector<std::string> PredicateFns;
+
+ /// TransformFn - The transformation function to execute on this node before
+ /// it can be substituted into the resulting instruction on a pattern match.
+ Record *TransformFn;
+
+ std::vector<TreePatternNode*> Children;
+public:
+ TreePatternNode(Record *Op, const std::vector<TreePatternNode*> &Ch)
+ : Types(), Operator(Op), Val(0), TransformFn(0),
+ Children(Ch) { Types.push_back(EMVT::isUnknown); }
+ TreePatternNode(Init *val) // leaf ctor
+ : Types(), Operator(0), Val(val), TransformFn(0) {
+ Types.push_back(EMVT::isUnknown);
+ }
+ ~TreePatternNode();
+
+ const std::string &getName() const { return Name; }
+ void setName(const std::string &N) { Name = N; }
+
+ bool isLeaf() const { return Val != 0; }
+ bool hasTypeSet() const {
+ return (Types[0] < MVT::LAST_VALUETYPE) || (Types[0] == MVT::iPTR) ||
+ (Types[0] == MVT::iPTRAny);
+ }
+ bool isTypeCompletelyUnknown() const {
+ return Types[0] == EMVT::isUnknown;
+ }
+ bool isTypeDynamicallyResolved() const {
+ return (Types[0] == MVT::iPTR) || (Types[0] == MVT::iPTRAny);
+ }
+ MVT::SimpleValueType getTypeNum(unsigned Num) const {
+ assert(hasTypeSet() && "Doesn't have a type yet!");
+ assert(Types.size() > Num && "Type num out of range!");
+ return (MVT::SimpleValueType)Types[Num];
+ }
+ unsigned char getExtTypeNum(unsigned Num) const {
+ assert(Types.size() > Num && "Extended type num out of range!");
+ return Types[Num];
+ }
+ const std::vector<unsigned char> &getExtTypes() const { return Types; }
+ void setTypes(const std::vector<unsigned char> &T) { Types = T; }
+ void removeTypes() { Types = std::vector<unsigned char>(1, EMVT::isUnknown); }
+
+ Init *getLeafValue() const { assert(isLeaf()); return Val; }
+ Record *getOperator() const { assert(!isLeaf()); return Operator; }
+
+ unsigned getNumChildren() const { return Children.size(); }
+ TreePatternNode *getChild(unsigned N) const { return Children[N]; }
+ void setChild(unsigned i, TreePatternNode *N) {
+ Children[i] = N;
+ }
+
+ const std::vector<std::string> &getPredicateFns() const { return PredicateFns; }
+ void clearPredicateFns() { PredicateFns.clear(); }
+ void setPredicateFns(const std::vector<std::string> &Fns) {
+ assert(PredicateFns.empty() && "Overwriting non-empty predicate list!");
+ PredicateFns = Fns;
+ }
+ void addPredicateFn(const std::string &Fn) {
+ assert(!Fn.empty() && "Empty predicate string!");
+ if (std::find(PredicateFns.begin(), PredicateFns.end(), Fn) ==
+ PredicateFns.end())
+ PredicateFns.push_back(Fn);
+ }
+
+ Record *getTransformFn() const { return TransformFn; }
+ void setTransformFn(Record *Fn) { TransformFn = Fn; }
+
+ /// getIntrinsicInfo - If this node corresponds to an intrinsic, return the
+ /// CodeGenIntrinsic information for it, otherwise return a null pointer.
+ const CodeGenIntrinsic *getIntrinsicInfo(const CodeGenDAGPatterns &CDP) const;
+
+ /// isCommutativeIntrinsic - Return true if the node is an intrinsic which is
+ /// marked isCommutative.
+ bool isCommutativeIntrinsic(const CodeGenDAGPatterns &CDP) const;
+
+ void print(std::ostream &OS) const;
+ void dump() const;
+
+public: // Higher level manipulation routines.
+
+ /// clone - Return a new copy of this tree.
+ ///
+ TreePatternNode *clone() const;
+
+ /// 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 isIsomorphicTo(const TreePatternNode *N,
+ const MultipleUseVarSet &DepVars) const;
+
+ /// SubstituteFormalArguments - Replace the formal arguments in this tree
+ /// with actual values specified by ArgMap.
+ void SubstituteFormalArguments(std::map<std::string,
+ TreePatternNode*> &ArgMap);
+
+ /// InlinePatternFragments - If this pattern refers to any pattern
+ /// fragments, inline them into place, giving us a pattern without any
+ /// PatFrag references.
+ TreePatternNode *InlinePatternFragments(TreePattern &TP);
+
+ /// ApplyTypeConstraints - Apply all of the type constraints relevant to
+ /// this node and its children in the tree. This returns true if it makes a
+ /// change, false otherwise. If a type contradiction is found, throw an
+ /// exception.
+ bool ApplyTypeConstraints(TreePattern &TP, bool NotRegisters);
+
+ /// UpdateNodeType - Set the node type of N to VT if VT contains
+ /// information. If N already contains a conflicting type, then throw an
+ /// exception. This returns true if any information was updated.
+ ///
+ bool UpdateNodeType(const std::vector<unsigned char> &ExtVTs,
+ TreePattern &TP);
+ bool UpdateNodeType(unsigned char ExtVT, TreePattern &TP) {
+ std::vector<unsigned char> ExtVTs(1, ExtVT);
+ return UpdateNodeType(ExtVTs, TP);
+ }
+
+ /// ContainsUnresolvedType - Return true if this tree contains any
+ /// unresolved types.
+ bool ContainsUnresolvedType() const {
+ if (!hasTypeSet() && !isTypeDynamicallyResolved()) return true;
+ for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
+ if (getChild(i)->ContainsUnresolvedType()) return true;
+ return false;
+ }
+
+ /// canPatternMatch - If it is impossible for this pattern to match on this
+ /// target, fill in Reason and return false. Otherwise, return true.
+ bool canPatternMatch(std::string &Reason, const CodeGenDAGPatterns &CDP);
+};
+
+
+/// TreePattern - Represent a pattern, used for instructions, pattern
+/// fragments, etc.
+///
+class TreePattern {
+ /// Trees - The list of pattern trees which corresponds to this pattern.
+ /// Note that PatFrag's only have a single tree.
+ ///
+ std::vector<TreePatternNode*> Trees;
+
+ /// TheRecord - The actual TableGen record corresponding to this pattern.
+ ///
+ Record *TheRecord;
+
+ /// Args - This is a list of all of the arguments to this pattern (for
+ /// PatFrag patterns), which are the 'node' markers in this pattern.
+ std::vector<std::string> Args;
+
+ /// CDP - the top-level object coordinating this madness.
+ ///
+ CodeGenDAGPatterns &CDP;
+
+ /// isInputPattern - True if this is an input pattern, something to match.
+ /// False if this is an output pattern, something to emit.
+ bool isInputPattern;
+public:
+
+ /// TreePattern constructor - Parse the specified DagInits into the
+ /// current record.
+ TreePattern(Record *TheRec, ListInit *RawPat, bool isInput,
+ CodeGenDAGPatterns &ise);
+ TreePattern(Record *TheRec, DagInit *Pat, bool isInput,
+ CodeGenDAGPatterns &ise);
+ TreePattern(Record *TheRec, TreePatternNode *Pat, bool isInput,
+ CodeGenDAGPatterns &ise);
+
+ /// getTrees - Return the tree patterns which corresponds to this pattern.
+ ///
+ const std::vector<TreePatternNode*> &getTrees() const { return Trees; }
+ unsigned getNumTrees() const { return Trees.size(); }
+ TreePatternNode *getTree(unsigned i) const { return Trees[i]; }
+ TreePatternNode *getOnlyTree() const {
+ assert(Trees.size() == 1 && "Doesn't have exactly one pattern!");
+ return Trees[0];
+ }
+
+ /// getRecord - Return the actual TableGen record corresponding to this
+ /// pattern.
+ ///
+ Record *getRecord() const { return TheRecord; }
+
+ unsigned getNumArgs() const { return Args.size(); }
+ const std::string &getArgName(unsigned i) const {
+ assert(i < Args.size() && "Argument reference out of range!");
+ return Args[i];
+ }
+ std::vector<std::string> &getArgList() { return Args; }
+
+ CodeGenDAGPatterns &getDAGPatterns() const { return CDP; }
+
+ /// InlinePatternFragments - If this pattern refers to any pattern
+ /// fragments, inline them into place, giving us a pattern without any
+ /// PatFrag references.
+ void InlinePatternFragments() {
+ for (unsigned i = 0, e = Trees.size(); i != e; ++i)
+ Trees[i] = Trees[i]->InlinePatternFragments(*this);
+ }
+
+ /// InferAllTypes - Infer/propagate as many types throughout the expression
+ /// patterns as possible. Return true if all types are inferred, false
+ /// otherwise. Throw an exception if a type contradiction is found.
+ bool InferAllTypes();
+
+ /// error - Throw an exception, prefixing it with information about this
+ /// pattern.
+ void error(const std::string &Msg) const;
+
+ void print(std::ostream &OS) const;
+ void dump() const;
+
+private:
+ TreePatternNode *ParseTreePattern(DagInit *DI);
+};
+
+/// DAGDefaultOperand - One of these is created for each PredicateOperand
+/// or OptionalDefOperand that has a set ExecuteAlways / DefaultOps field.
+struct DAGDefaultOperand {
+ std::vector<TreePatternNode*> DefaultOps;
+};
+
+class DAGInstruction {
+ TreePattern *Pattern;
+ std::vector<Record*> Results;
+ std::vector<Record*> Operands;
+ std::vector<Record*> ImpResults;
+ std::vector<Record*> ImpOperands;
+ TreePatternNode *ResultPattern;
+public:
+ DAGInstruction(TreePattern *TP,
+ const std::vector<Record*> &results,
+ const std::vector<Record*> &operands,
+ const std::vector<Record*> &impresults,
+ const std::vector<Record*> &impoperands)
+ : Pattern(TP), Results(results), Operands(operands),
+ ImpResults(impresults), ImpOperands(impoperands),
+ ResultPattern(0) {}
+
+ const TreePattern *getPattern() const { return Pattern; }
+ unsigned getNumResults() const { return Results.size(); }
+ unsigned getNumOperands() const { return Operands.size(); }
+ unsigned getNumImpResults() const { return ImpResults.size(); }
+ unsigned getNumImpOperands() const { return ImpOperands.size(); }
+ const std::vector<Record*>& getImpResults() const { return ImpResults; }
+
+ void setResultPattern(TreePatternNode *R) { ResultPattern = R; }
+
+ Record *getResult(unsigned RN) const {
+ assert(RN < Results.size());
+ return Results[RN];
+ }
+
+ Record *getOperand(unsigned ON) const {
+ assert(ON < Operands.size());
+ return Operands[ON];
+ }
+
+ Record *getImpResult(unsigned RN) const {
+ assert(RN < ImpResults.size());
+ return ImpResults[RN];
+ }
+
+ Record *getImpOperand(unsigned ON) const {
+ assert(ON < ImpOperands.size());
+ return ImpOperands[ON];
+ }
+
+ TreePatternNode *getResultPattern() const { return ResultPattern; }
+};
+
+/// PatternToMatch - Used by CodeGenDAGPatterns to keep tab of patterns
+/// processed to produce isel.
+struct PatternToMatch {
+ PatternToMatch(ListInit *preds,
+ TreePatternNode *src, TreePatternNode *dst,
+ const std::vector<Record*> &dstregs,
+ unsigned complexity):
+ Predicates(preds), SrcPattern(src), DstPattern(dst), Dstregs(dstregs),
+ AddedComplexity(complexity) {};
+
+ ListInit *Predicates; // Top level predicate conditions to match.
+ TreePatternNode *SrcPattern; // Source pattern to match.
+ TreePatternNode *DstPattern; // Resulting pattern.
+ std::vector<Record*> Dstregs; // Physical register defs being matched.
+ unsigned AddedComplexity; // Add to matching pattern complexity.
+
+ ListInit *getPredicates() const { return Predicates; }
+ TreePatternNode *getSrcPattern() const { return SrcPattern; }
+ TreePatternNode *getDstPattern() const { return DstPattern; }
+ const std::vector<Record*> &getDstRegs() const { return Dstregs; }
+ unsigned getAddedComplexity() const { return AddedComplexity; }
+
+ std::string getPredicateCheck() const;
+};
+
+
+class CodeGenDAGPatterns {
+ RecordKeeper &Records;
+ CodeGenTarget Target;
+ std::vector<CodeGenIntrinsic> Intrinsics;
+ std::vector<CodeGenIntrinsic> TgtIntrinsics;
+
+ std::map<Record*, SDNodeInfo> SDNodes;
+ std::map<Record*, std::pair<Record*, std::string> > SDNodeXForms;
+ std::map<Record*, ComplexPattern> ComplexPatterns;
+ std::map<Record*, TreePattern*> PatternFragments;
+ std::map<Record*, DAGDefaultOperand> DefaultOperands;
+ std::map<Record*, DAGInstruction> Instructions;
+
+ // Specific SDNode definitions:
+ Record *intrinsic_void_sdnode;
+ Record *intrinsic_w_chain_sdnode, *intrinsic_wo_chain_sdnode;
+
+ /// PatternsToMatch - All of the things we are matching on the DAG. The first
+ /// value is the pattern to match, the second pattern is the result to
+ /// emit.
+ std::vector<PatternToMatch> PatternsToMatch;
+public:
+ CodeGenDAGPatterns(RecordKeeper &R);
+ ~CodeGenDAGPatterns();
+
+ CodeGenTarget &getTargetInfo() { return Target; }
+ const CodeGenTarget &getTargetInfo() const { return Target; }
+
+ Record *getSDNodeNamed(const std::string &Name) const;
+
+ const SDNodeInfo &getSDNodeInfo(Record *R) const {
+ assert(SDNodes.count(R) && "Unknown node!");
+ return SDNodes.find(R)->second;
+ }
+
+ // Node transformation lookups.
+ typedef std::pair<Record*, std::string> NodeXForm;
+ const NodeXForm &getSDNodeTransform(Record *R) const {
+ assert(SDNodeXForms.count(R) && "Invalid transform!");
+ return SDNodeXForms.find(R)->second;
+ }
+
+ typedef std::map<Record*, NodeXForm>::const_iterator nx_iterator;
+ nx_iterator nx_begin() const { return SDNodeXForms.begin(); }
+ nx_iterator nx_end() const { return SDNodeXForms.end(); }
+
+
+ const ComplexPattern &getComplexPattern(Record *R) const {
+ assert(ComplexPatterns.count(R) && "Unknown addressing mode!");
+ return ComplexPatterns.find(R)->second;
+ }
+
+ const CodeGenIntrinsic &getIntrinsic(Record *R) const {
+ for (unsigned i = 0, e = Intrinsics.size(); i != e; ++i)
+ if (Intrinsics[i].TheDef == R) return Intrinsics[i];
+ for (unsigned i = 0, e = TgtIntrinsics.size(); i != e; ++i)
+ if (TgtIntrinsics[i].TheDef == R) return TgtIntrinsics[i];
+ assert(0 && "Unknown intrinsic!");
+ abort();
+ }
+
+ const CodeGenIntrinsic &getIntrinsicInfo(unsigned IID) const {
+ if (IID-1 < Intrinsics.size())
+ return Intrinsics[IID-1];
+ if (IID-Intrinsics.size()-1 < TgtIntrinsics.size())
+ return TgtIntrinsics[IID-Intrinsics.size()-1];
+ assert(0 && "Bad intrinsic ID!");
+ abort();
+ }
+
+ unsigned getIntrinsicID(Record *R) const {
+ for (unsigned i = 0, e = Intrinsics.size(); i != e; ++i)
+ if (Intrinsics[i].TheDef == R) return i;
+ for (unsigned i = 0, e = TgtIntrinsics.size(); i != e; ++i)
+ if (TgtIntrinsics[i].TheDef == R) return i + Intrinsics.size();
+ assert(0 && "Unknown intrinsic!");
+ abort();
+ }
+
+ const DAGDefaultOperand &getDefaultOperand(Record *R) {
+ assert(DefaultOperands.count(R) &&"Isn't an analyzed default operand!");
+ return DefaultOperands.find(R)->second;
+ }
+
+ // Pattern Fragment information.
+ TreePattern *getPatternFragment(Record *R) const {
+ assert(PatternFragments.count(R) && "Invalid pattern fragment request!");
+ return PatternFragments.find(R)->second;
+ }
+ typedef std::map<Record*, TreePattern*>::const_iterator pf_iterator;
+ pf_iterator pf_begin() const { return PatternFragments.begin(); }
+ pf_iterator pf_end() const { return PatternFragments.end(); }
+
+ // Patterns to match information.
+ typedef std::vector<PatternToMatch>::const_iterator ptm_iterator;
+ ptm_iterator ptm_begin() const { return PatternsToMatch.begin(); }
+ ptm_iterator ptm_end() const { return PatternsToMatch.end(); }
+
+
+
+ const DAGInstruction &getInstruction(Record *R) const {
+ assert(Instructions.count(R) && "Unknown instruction!");
+ return Instructions.find(R)->second;
+ }
+
+ Record *get_intrinsic_void_sdnode() const {
+ return intrinsic_void_sdnode;
+ }
+ Record *get_intrinsic_w_chain_sdnode() const {
+ return intrinsic_w_chain_sdnode;
+ }
+ Record *get_intrinsic_wo_chain_sdnode() const {
+ return intrinsic_wo_chain_sdnode;
+ }
+
+private:
+ void ParseNodeInfo();
+ void ParseNodeTransforms();
+ void ParseComplexPatterns();
+ void ParsePatternFragments();
+ void ParseDefaultOperands();
+ void ParseInstructions();
+ void ParsePatterns();
+ void InferInstructionFlags();
+ void GenerateVariants();
+
+ void 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);
+};
+} // end namespace llvm
+
+#endif
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