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ddb395463c
ValueType from the RegisterClass or Operands. This step is necessary to allow RegisterClasses to have multiple ValueTypes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24555 91177308-0d34-0410-b5e6-96231b3b80d8
431 lines
16 KiB
C++
431 lines
16 KiB
C++
//===- DAGISelEmitter.h - Generate an instruction selector ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Chris Lattner and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This tablegen backend emits a DAG instruction selector.
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//
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//===----------------------------------------------------------------------===//
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#ifndef DAGISEL_EMITTER_H
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#define DAGISEL_EMITTER_H
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#include "TableGenBackend.h"
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#include "CodeGenTarget.h"
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namespace llvm {
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class Record;
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struct Init;
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class ListInit;
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class DagInit;
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class SDNodeInfo;
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class TreePattern;
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class TreePatternNode;
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class DAGISelEmitter;
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/// MVT::DAGISelGenValueType - These are some extended forms of MVT::ValueType
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/// that we use as lattice values during type inferrence.
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namespace MVT {
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enum DAGISelGenValueType {
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isFP = MVT::LAST_VALUETYPE,
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isInt,
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isUnknown
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};
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}
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/// SDTypeConstraint - This is a discriminated union of constraints,
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/// corresponding to the SDTypeConstraint tablegen class in Target.td.
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struct SDTypeConstraint {
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SDTypeConstraint(Record *R);
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unsigned OperandNo; // The operand # this constraint applies to.
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enum {
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SDTCisVT, SDTCisInt, SDTCisFP, SDTCisSameAs, SDTCisVTSmallerThanOp,
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SDTCisOpSmallerThanOp
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} ConstraintType;
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union { // The discriminated union.
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struct {
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MVT::ValueType VT;
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} SDTCisVT_Info;
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struct {
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unsigned OtherOperandNum;
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} SDTCisSameAs_Info;
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struct {
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unsigned OtherOperandNum;
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} SDTCisVTSmallerThanOp_Info;
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struct {
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unsigned BigOperandNum;
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} SDTCisOpSmallerThanOp_Info;
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} x;
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/// ApplyTypeConstraint - Given a node in a pattern, apply this type
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/// constraint to the nodes operands. This returns true if it makes a
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/// change, false otherwise. If a type contradiction is found, throw an
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/// exception.
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bool ApplyTypeConstraint(TreePatternNode *N, const SDNodeInfo &NodeInfo,
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TreePattern &TP) const;
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/// getOperandNum - Return the node corresponding to operand #OpNo in tree
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/// N, which has NumResults results.
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TreePatternNode *getOperandNum(unsigned OpNo, TreePatternNode *N,
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unsigned NumResults) const;
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};
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/// SDNodeInfo - One of these records is created for each SDNode instance in
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/// the target .td file. This represents the various dag nodes we will be
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/// processing.
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class SDNodeInfo {
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Record *Def;
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std::string EnumName;
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std::string SDClassName;
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unsigned Properties;
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unsigned NumResults;
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int NumOperands;
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std::vector<SDTypeConstraint> TypeConstraints;
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public:
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SDNodeInfo(Record *R); // Parse the specified record.
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unsigned getNumResults() const { return NumResults; }
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int getNumOperands() const { return NumOperands; }
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Record *getRecord() const { return Def; }
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const std::string &getEnumName() const { return EnumName; }
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const std::string &getSDClassName() const { return SDClassName; }
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const std::vector<SDTypeConstraint> &getTypeConstraints() const {
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return TypeConstraints;
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}
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// SelectionDAG node properties.
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enum SDNP { SDNPCommutative, SDNPAssociative };
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/// hasProperty - Return true if this node has the specified property.
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///
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bool hasProperty(enum SDNP Prop) const { return Properties & (1 << Prop); }
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/// ApplyTypeConstraints - Given a node in a pattern, apply the type
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/// constraints for this node to the operands of the node. This returns
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/// true if it makes a change, false otherwise. If a type contradiction is
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/// found, throw an exception.
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bool ApplyTypeConstraints(TreePatternNode *N, TreePattern &TP) const {
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bool MadeChange = false;
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for (unsigned i = 0, e = TypeConstraints.size(); i != e; ++i)
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MadeChange |= TypeConstraints[i].ApplyTypeConstraint(N, *this, TP);
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return MadeChange;
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}
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};
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/// FIXME: TreePatternNode's can be shared in some cases (due to dag-shaped
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/// patterns), and as such should be ref counted. We currently just leak all
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/// TreePatternNode objects!
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class TreePatternNode {
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/// The inferred type for this node, or MVT::LAST_VALUETYPE if it hasn't
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/// been determined yet.
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unsigned char Ty;
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/// Operator - The Record for the operator if this is an interior node (not
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/// a leaf).
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Record *Operator;
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/// Val - The init value (e.g. the "GPRC" record, or "7") for a leaf.
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///
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Init *Val;
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/// Name - The name given to this node with the :$foo notation.
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///
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std::string Name;
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/// PredicateFn - The predicate function to execute on this node to check
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/// for a match. If this string is empty, no predicate is involved.
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std::string PredicateFn;
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/// TransformFn - The transformation function to execute on this node before
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/// it can be substituted into the resulting instruction on a pattern match.
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Record *TransformFn;
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std::vector<TreePatternNode*> Children;
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public:
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TreePatternNode(Record *Op, const std::vector<TreePatternNode*> &Ch)
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: Ty(MVT::isUnknown), Operator(Op), Val(0), TransformFn(0),
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Children(Ch) {}
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TreePatternNode(Init *val) // leaf ctor
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: Ty(MVT::isUnknown), Operator(0), Val(val), TransformFn(0) {}
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~TreePatternNode();
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const std::string &getName() const { return Name; }
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void setName(const std::string &N) { Name = N; }
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bool isLeaf() const { return Val != 0; }
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bool hasTypeSet() const { return Ty < MVT::LAST_VALUETYPE; }
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bool isTypeCompletelyUnknown() const {
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return Ty == MVT::isUnknown;
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}
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MVT::ValueType getType() const {
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assert(hasTypeSet() && "Doesn't have a type yet!");
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return (MVT::ValueType)Ty;
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}
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unsigned char getExtType() const { return Ty; }
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void setType(unsigned char VT) { Ty = VT; }
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Init *getLeafValue() const { assert(isLeaf()); return Val; }
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Record *getOperator() const { assert(!isLeaf()); return Operator; }
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unsigned getNumChildren() const { return Children.size(); }
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TreePatternNode *getChild(unsigned N) const { return Children[N]; }
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void setChild(unsigned i, TreePatternNode *N) {
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Children[i] = N;
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}
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const std::string &getPredicateFn() const { return PredicateFn; }
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void setPredicateFn(const std::string &Fn) { PredicateFn = Fn; }
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Record *getTransformFn() const { return TransformFn; }
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void setTransformFn(Record *Fn) { TransformFn = Fn; }
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void print(std::ostream &OS) const;
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void dump() const;
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public: // Higher level manipulation routines.
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/// clone - Return a new copy of this tree.
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///
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TreePatternNode *clone() const;
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/// isIsomorphicTo - Return true if this node is recursively isomorphic to
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/// the specified node. For this comparison, all of the state of the node
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/// is considered, except for the assigned name. Nodes with differing names
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/// that are otherwise identical are considered isomorphic.
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bool isIsomorphicTo(const TreePatternNode *N) const;
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/// SubstituteFormalArguments - Replace the formal arguments in this tree
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/// with actual values specified by ArgMap.
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void SubstituteFormalArguments(std::map<std::string,
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TreePatternNode*> &ArgMap);
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/// InlinePatternFragments - If this pattern refers to any pattern
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/// fragments, inline them into place, giving us a pattern without any
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/// PatFrag references.
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TreePatternNode *InlinePatternFragments(TreePattern &TP);
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/// ApplyTypeConstraints - Apply all of the type constraints relevent to
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/// this node and its children in the tree. This returns true if it makes a
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/// change, false otherwise. If a type contradiction is found, throw an
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/// exception.
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bool ApplyTypeConstraints(TreePattern &TP, bool NotRegisters);
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/// UpdateNodeType - Set the node type of N to VT if VT contains
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/// information. If N already contains a conflicting type, then throw an
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/// exception. This returns true if any information was updated.
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///
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bool UpdateNodeType(unsigned char EVT, TreePattern &TP);
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/// ContainsUnresolvedType - Return true if this tree contains any
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/// unresolved types.
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bool ContainsUnresolvedType() const {
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if (!hasTypeSet()) return true;
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for (unsigned i = 0, e = getNumChildren(); i != e; ++i)
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if (getChild(i)->ContainsUnresolvedType()) return true;
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return false;
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}
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/// canPatternMatch - If it is impossible for this pattern to match on this
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/// target, fill in Reason and return false. Otherwise, return true.
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bool canPatternMatch(std::string &Reason, DAGISelEmitter &ISE);
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};
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/// TreePattern - Represent a pattern, used for instructions, pattern
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/// fragments, etc.
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///
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class TreePattern {
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/// Trees - The list of pattern trees which corresponds to this pattern.
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/// Note that PatFrag's only have a single tree.
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///
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std::vector<TreePatternNode*> Trees;
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/// TheRecord - The actual TableGen record corresponding to this pattern.
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///
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Record *TheRecord;
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/// Args - This is a list of all of the arguments to this pattern (for
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/// PatFrag patterns), which are the 'node' markers in this pattern.
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std::vector<std::string> Args;
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/// ISE - the DAG isel emitter coordinating this madness.
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///
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DAGISelEmitter &ISE;
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/// isInputPattern - True if this is an input pattern, something to match.
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/// False if this is an output pattern, something to emit.
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bool isInputPattern;
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public:
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/// TreePattern constructor - Parse the specified DagInits into the
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/// current record.
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TreePattern(Record *TheRec, ListInit *RawPat, bool isInput,
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DAGISelEmitter &ise);
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TreePattern(Record *TheRec, DagInit *Pat, bool isInput,
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DAGISelEmitter &ise);
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TreePattern(Record *TheRec, TreePatternNode *Pat, bool isInput,
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DAGISelEmitter &ise);
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/// getTrees - Return the tree patterns which corresponds to this pattern.
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///
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const std::vector<TreePatternNode*> &getTrees() const { return Trees; }
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unsigned getNumTrees() const { return Trees.size(); }
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TreePatternNode *getTree(unsigned i) const { return Trees[i]; }
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TreePatternNode *getOnlyTree() const {
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assert(Trees.size() == 1 && "Doesn't have exactly one pattern!");
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return Trees[0];
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}
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/// getRecord - Return the actual TableGen record corresponding to this
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/// pattern.
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///
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Record *getRecord() const { return TheRecord; }
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unsigned getNumArgs() const { return Args.size(); }
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const std::string &getArgName(unsigned i) const {
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assert(i < Args.size() && "Argument reference out of range!");
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return Args[i];
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}
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std::vector<std::string> &getArgList() { return Args; }
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DAGISelEmitter &getDAGISelEmitter() const { return ISE; }
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/// InlinePatternFragments - If this pattern refers to any pattern
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/// fragments, inline them into place, giving us a pattern without any
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/// PatFrag references.
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void InlinePatternFragments() {
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for (unsigned i = 0, e = Trees.size(); i != e; ++i)
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Trees[i] = Trees[i]->InlinePatternFragments(*this);
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}
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/// InferAllTypes - Infer/propagate as many types throughout the expression
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/// patterns as possible. Return true if all types are infered, false
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/// otherwise. Throw an exception if a type contradiction is found.
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bool InferAllTypes();
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/// error - Throw an exception, prefixing it with information about this
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/// pattern.
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void error(const std::string &Msg) const;
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void print(std::ostream &OS) const;
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void dump() const;
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private:
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TreePatternNode *ParseTreePattern(DagInit *DI);
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};
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class DAGInstruction {
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TreePattern *Pattern;
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unsigned NumResults;
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unsigned NumOperands;
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std::vector<Record*> Results;
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std::vector<Record*> Operands;
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TreePatternNode *ResultPattern;
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public:
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DAGInstruction(TreePattern *TP,
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const std::vector<Record*> &results,
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const std::vector<Record*> &operands)
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: Pattern(TP), Results(results), Operands(operands),
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ResultPattern(0) {}
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TreePattern *getPattern() const { return Pattern; }
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unsigned getNumResults() const { return Results.size(); }
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unsigned getNumOperands() const { return Operands.size(); }
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void setResultPattern(TreePatternNode *R) { ResultPattern = R; }
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Record *getResult(unsigned RN) const {
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assert(RN < Results.size());
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return Results[RN];
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}
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Record *getOperand(unsigned ON) const {
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assert(ON < Operands.size());
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return Operands[ON];
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}
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TreePatternNode *getResultPattern() const { return ResultPattern; }
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};
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/// InstrSelectorEmitter - The top-level class which coordinates construction
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/// and emission of the instruction selector.
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///
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class DAGISelEmitter : public TableGenBackend {
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public:
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typedef std::pair<TreePatternNode*, TreePatternNode*> PatternToMatch;
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private:
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RecordKeeper &Records;
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CodeGenTarget Target;
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std::map<Record*, SDNodeInfo> SDNodes;
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std::map<Record*, std::pair<Record*, std::string> > SDNodeXForms;
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std::map<Record*, TreePattern*> PatternFragments;
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std::map<Record*, DAGInstruction> Instructions;
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/// PatternsToMatch - All of the things we are matching on the DAG. The first
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/// value is the pattern to match, the second pattern is the result to
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/// emit.
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std::vector<PatternToMatch> PatternsToMatch;
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public:
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DAGISelEmitter(RecordKeeper &R) : Records(R) {}
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// run - Output the isel, returning true on failure.
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void run(std::ostream &OS);
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const CodeGenTarget &getTargetInfo() const { return Target; }
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Record *getSDNodeNamed(const std::string &Name) const;
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const SDNodeInfo &getSDNodeInfo(Record *R) const {
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assert(SDNodes.count(R) && "Unknown node!");
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return SDNodes.find(R)->second;
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}
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TreePattern *getPatternFragment(Record *R) const {
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assert(PatternFragments.count(R) && "Invalid pattern fragment request!");
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return PatternFragments.find(R)->second;
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}
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const std::pair<Record*, std::string> &getSDNodeTransform(Record *R) const {
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assert(SDNodeXForms.count(R) && "Invalid transform!");
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return SDNodeXForms.find(R)->second;
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}
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const DAGInstruction &getInstruction(Record *R) const {
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assert(Instructions.count(R) && "Unknown instruction!");
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return Instructions.find(R)->second;
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}
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private:
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void ParseNodeInfo();
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void ParseNodeTransforms(std::ostream &OS);
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void ParsePatternFragments(std::ostream &OS);
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void ParseInstructions();
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void ParsePatterns();
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void GenerateVariants();
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void FindPatternInputsAndOutputs(TreePattern *I, TreePatternNode *Pat,
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std::map<std::string,
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TreePatternNode*> &InstInputs,
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std::map<std::string, Record*> &InstResults);
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void EmitMatchForPattern(TreePatternNode *N, const std::string &RootName,
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std::map<std::string,std::string> &VarMap,
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unsigned PatternNo, std::ostream &OS);
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unsigned CodeGenPatternResult(TreePatternNode *N, unsigned &Ctr,
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std::map<std::string,std::string> &VariableMap,
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std::ostream &OS, bool isRoot = false);
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void EmitCodeForPattern(PatternToMatch &Pattern, std::ostream &OS);
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void EmitInstructionSelector(std::ostream &OS);
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};
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} // End llvm namespace
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#endif
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