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402 lines
13 KiB
C++
402 lines
13 KiB
C++
//===- DAGISelMatcher.cpp - Representation of DAG pattern matcher ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DAGISelMatcher.h"
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#include "CodeGenDAGPatterns.h"
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#include "CodeGenTarget.h"
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#include "Record.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/StringExtras.h"
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using namespace llvm;
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void Matcher::dump() const {
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print(errs(), 0);
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}
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void Matcher::print(raw_ostream &OS, unsigned indent) const {
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printImpl(OS, indent);
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if (Next)
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return Next->print(OS, indent);
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}
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void Matcher::printOne(raw_ostream &OS) const {
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printImpl(OS, 0);
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}
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/// unlinkNode - Unlink the specified node from this chain. If Other == this,
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/// we unlink the next pointer and return it. Otherwise we unlink Other from
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/// the list and return this.
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Matcher *Matcher::unlinkNode(Matcher *Other) {
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if (this == Other)
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return takeNext();
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// Scan until we find the predecessor of Other.
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Matcher *Cur = this;
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for (; Cur && Cur->getNext() != Other; Cur = Cur->getNext())
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/*empty*/;
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if (Cur == 0) return 0;
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Cur->takeNext();
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Cur->setNext(Other->takeNext());
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return this;
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}
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/// canMoveBefore - Return true if this matcher is the same as Other, or if
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/// we can move this matcher past all of the nodes in-between Other and this
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/// node. Other must be equal to or before this.
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bool Matcher::canMoveBefore(const Matcher *Other) const {
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for (;; Other = Other->getNext()) {
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assert(Other && "Other didn't come before 'this'?");
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if (this == Other) return true;
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// We have to be able to move this node across the Other node.
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if (!canMoveBeforeNode(Other))
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return false;
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}
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}
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/// canMoveBefore - Return true if it is safe to move the current matcher
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/// across the specified one.
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bool Matcher::canMoveBeforeNode(const Matcher *Other) const {
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// We can move simple predicates before record nodes.
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if (isSimplePredicateNode())
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return Other->isSimplePredicateOrRecordNode();
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// We can move record nodes across simple predicates.
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if (isSimplePredicateOrRecordNode())
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return isSimplePredicateNode();
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// We can't move record nodes across each other etc.
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return false;
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}
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ScopeMatcher::~ScopeMatcher() {
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for (unsigned i = 0, e = Children.size(); i != e; ++i)
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delete Children[i];
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}
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// printImpl methods.
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void ScopeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "Scope\n";
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for (unsigned i = 0, e = getNumChildren(); i != e; ++i) {
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if (getChild(i) == 0)
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OS.indent(indent+1) << "NULL POINTER\n";
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else
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getChild(i)->print(OS, indent+2);
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}
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}
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void RecordMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "Record\n";
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}
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void RecordChildMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "RecordChild: " << ChildNo << '\n';
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}
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void RecordMemRefMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "RecordMemRef\n";
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}
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void CaptureFlagInputMatcher::printImpl(raw_ostream &OS, unsigned indent) const{
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OS.indent(indent) << "CaptureFlagInput\n";
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}
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void MoveChildMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "MoveChild " << ChildNo << '\n';
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}
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void MoveParentMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "MoveParent\n";
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}
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void CheckSameMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckSame " << MatchNumber << '\n';
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}
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void CheckPatternPredicateMatcher::
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printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckPatternPredicate " << Predicate << '\n';
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}
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void CheckPredicateMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckPredicate " << PredName << '\n';
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}
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void CheckOpcodeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckOpcode " << Opcode.getEnumName() << '\n';
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}
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void SwitchOpcodeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "SwitchOpcode: {\n";
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for (unsigned i = 0, e = Cases.size(); i != e; ++i) {
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OS.indent(indent) << "case " << Cases[i].first->getEnumName() << ":\n";
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Cases[i].second->print(OS, indent+2);
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}
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OS.indent(indent) << "}\n";
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}
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void CheckTypeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckType " << getEnumName(Type) << ", ResNo="
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<< ResNo << '\n';
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}
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void SwitchTypeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "SwitchType: {\n";
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for (unsigned i = 0, e = Cases.size(); i != e; ++i) {
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OS.indent(indent) << "case " << getEnumName(Cases[i].first) << ":\n";
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Cases[i].second->print(OS, indent+2);
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}
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OS.indent(indent) << "}\n";
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}
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void CheckChildTypeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckChildType " << ChildNo << " "
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<< getEnumName(Type) << '\n';
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}
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void CheckIntegerMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckInteger " << Value << '\n';
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}
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void CheckCondCodeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckCondCode ISD::" << CondCodeName << '\n';
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}
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void CheckValueTypeMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckValueType MVT::" << TypeName << '\n';
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}
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void CheckComplexPatMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckComplexPat " << Pattern.getSelectFunc() << '\n';
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}
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void CheckAndImmMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckAndImm " << Value << '\n';
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}
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void CheckOrImmMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CheckOrImm " << Value << '\n';
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}
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void CheckFoldableChainNodeMatcher::printImpl(raw_ostream &OS,
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unsigned indent) const {
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OS.indent(indent) << "CheckFoldableChainNode\n";
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}
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void EmitIntegerMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitInteger " << Val << " VT=" << VT << '\n';
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}
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void EmitStringIntegerMatcher::
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printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitStringInteger " << Val << " VT=" << VT << '\n';
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}
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void EmitRegisterMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitRegister ";
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if (Reg)
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OS << Reg->getName();
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else
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OS << "zero_reg";
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OS << " VT=" << VT << '\n';
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}
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void EmitConvertToTargetMatcher::
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printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitConvertToTarget " << Slot << '\n';
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}
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void EmitMergeInputChainsMatcher::
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printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitMergeInputChains <todo: args>\n";
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}
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void EmitCopyToRegMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitCopyToReg <todo: args>\n";
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}
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void EmitNodeXFormMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "EmitNodeXForm " << NodeXForm->getName()
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<< " Slot=" << Slot << '\n';
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}
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void EmitNodeMatcherCommon::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent);
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OS << (isa<MorphNodeToMatcher>(this) ? "MorphNodeTo: " : "EmitNode: ")
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<< OpcodeName << ": <todo flags> ";
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for (unsigned i = 0, e = VTs.size(); i != e; ++i)
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OS << ' ' << getEnumName(VTs[i]);
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OS << '(';
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for (unsigned i = 0, e = Operands.size(); i != e; ++i)
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OS << Operands[i] << ' ';
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OS << ")\n";
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}
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void MarkFlagResultsMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "MarkFlagResults <todo: args>\n";
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}
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void CompleteMatchMatcher::printImpl(raw_ostream &OS, unsigned indent) const {
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OS.indent(indent) << "CompleteMatch <todo args>\n";
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OS.indent(indent) << "Src = " << *Pattern.getSrcPattern() << "\n";
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OS.indent(indent) << "Dst = " << *Pattern.getDstPattern() << "\n";
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}
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// getHashImpl Implementation.
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unsigned CheckPatternPredicateMatcher::getHashImpl() const {
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return HashString(Predicate);
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}
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unsigned CheckPredicateMatcher::getHashImpl() const {
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return HashString(PredName);
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}
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unsigned CheckOpcodeMatcher::getHashImpl() const {
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return HashString(Opcode.getEnumName());
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}
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unsigned CheckCondCodeMatcher::getHashImpl() const {
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return HashString(CondCodeName);
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}
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unsigned CheckValueTypeMatcher::getHashImpl() const {
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return HashString(TypeName);
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}
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unsigned EmitStringIntegerMatcher::getHashImpl() const {
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return HashString(Val) ^ VT;
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}
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template<typename It>
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static unsigned HashUnsigneds(It I, It E) {
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unsigned Result = 0;
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for (; I != E; ++I)
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Result = (Result<<3) ^ *I;
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return Result;
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}
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unsigned EmitMergeInputChainsMatcher::getHashImpl() const {
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return HashUnsigneds(ChainNodes.begin(), ChainNodes.end());
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}
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bool CheckOpcodeMatcher::isEqualImpl(const Matcher *M) const {
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// Note: pointer equality isn't enough here, we have to check the enum names
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// to ensure that the nodes are for the same opcode.
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return cast<CheckOpcodeMatcher>(M)->Opcode.getEnumName() ==
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Opcode.getEnumName();
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}
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bool EmitNodeMatcherCommon::isEqualImpl(const Matcher *m) const {
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const EmitNodeMatcherCommon *M = cast<EmitNodeMatcherCommon>(m);
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return M->OpcodeName == OpcodeName && M->VTs == VTs &&
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M->Operands == Operands && M->HasChain == HasChain &&
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M->HasInFlag == HasInFlag && M->HasOutFlag == HasOutFlag &&
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M->HasMemRefs == HasMemRefs &&
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M->NumFixedArityOperands == NumFixedArityOperands;
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}
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unsigned EmitNodeMatcherCommon::getHashImpl() const {
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return (HashString(OpcodeName) << 4) | Operands.size();
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}
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unsigned MarkFlagResultsMatcher::getHashImpl() const {
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return HashUnsigneds(FlagResultNodes.begin(), FlagResultNodes.end());
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}
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unsigned CompleteMatchMatcher::getHashImpl() const {
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return HashUnsigneds(Results.begin(), Results.end()) ^
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((unsigned)(intptr_t)&Pattern << 8);
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}
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// isContradictoryImpl Implementations.
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static bool TypesAreContradictory(MVT::SimpleValueType T1,
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MVT::SimpleValueType T2) {
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// If the two types are the same, then they are the same, so they don't
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// contradict.
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if (T1 == T2) return false;
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// If either type is about iPtr, then they don't conflict unless the other
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// one is not a scalar integer type.
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if (T1 == MVT::iPTR)
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return !MVT(T2).isInteger() || MVT(T2).isVector();
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if (T2 == MVT::iPTR)
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return !MVT(T1).isInteger() || MVT(T1).isVector();
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// Otherwise, they are two different non-iPTR types, they conflict.
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return true;
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}
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bool CheckOpcodeMatcher::isContradictoryImpl(const Matcher *M) const {
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if (const CheckOpcodeMatcher *COM = dyn_cast<CheckOpcodeMatcher>(M)) {
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// One node can't have two different opcodes!
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// Note: pointer equality isn't enough here, we have to check the enum names
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// to ensure that the nodes are for the same opcode.
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return COM->getOpcode().getEnumName() != getOpcode().getEnumName();
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}
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// If the node has a known type, and if the type we're checking for is
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// different, then we know they contradict. For example, a check for
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// ISD::STORE will never be true at the same time a check for Type i32 is.
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if (const CheckTypeMatcher *CT = dyn_cast<CheckTypeMatcher>(M)) {
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// If checking for a result the opcode doesn't have, it can't match.
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if (CT->getResNo() >= getOpcode().getNumResults())
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return true;
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MVT::SimpleValueType NodeType = getOpcode().getKnownType(CT->getResNo());
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if (NodeType != MVT::Other)
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return TypesAreContradictory(NodeType, CT->getType());
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}
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return false;
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}
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bool CheckTypeMatcher::isContradictoryImpl(const Matcher *M) const {
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if (const CheckTypeMatcher *CT = dyn_cast<CheckTypeMatcher>(M))
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return TypesAreContradictory(getType(), CT->getType());
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return false;
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}
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bool CheckChildTypeMatcher::isContradictoryImpl(const Matcher *M) const {
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if (const CheckChildTypeMatcher *CC = dyn_cast<CheckChildTypeMatcher>(M)) {
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// If the two checks are about different nodes, we don't know if they
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// conflict!
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if (CC->getChildNo() != getChildNo())
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return false;
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return TypesAreContradictory(getType(), CC->getType());
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}
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return false;
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}
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bool CheckIntegerMatcher::isContradictoryImpl(const Matcher *M) const {
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if (const CheckIntegerMatcher *CIM = dyn_cast<CheckIntegerMatcher>(M))
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return CIM->getValue() != getValue();
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return false;
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}
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bool CheckValueTypeMatcher::isContradictoryImpl(const Matcher *M) const {
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if (const CheckValueTypeMatcher *CVT = dyn_cast<CheckValueTypeMatcher>(M))
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return CVT->getTypeName() != getTypeName();
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return false;
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}
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