mirror of
https://github.com/RPCS3/llvm-mirror.git
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Revert rL303923 since it broke the sanitizer bootstrap build bot.
llvm-svn: 303969
This commit is contained in:
Wei Mi
parent
a70185a2f6
commit
269e464a80
@ -68,24 +68,6 @@ public:
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class ValueTable {
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DenseMap<Value *, uint32_t> valueNumbering;
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DenseMap<Expression, uint32_t> expressionNumbering;
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// Expressions is the vector of Expression. ExprIdx is the mapping from
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// value number to the index of Expression in Expressions. We use it
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// instead of a DenseMap because filling such mapping is faster than
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// filling a DenseMap and the compile time is a little better.
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uint32_t nextExprNumber;
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std::vector<Expression> Expressions;
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std::vector<uint32_t> ExprIdx;
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// Value number to PHINode mapping. Used for phi-translate in scalarpre.
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DenseMap<uint32_t, PHINode *> NumberingPhi;
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// Cache for phi-translate in scalarpre.
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typedef DenseMap<std::pair<uint32_t, const BasicBlock *>, uint32_t>
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PhiTranslateMap;
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PhiTranslateMap PhiTranslateTable;
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// Map the block to reversed postorder traversal number. It is used to
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// find back edge easily.
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DenseMap<const BasicBlock *, uint32_t> BlockRPONumber;
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AliasAnalysis *AA;
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MemoryDependenceResults *MD;
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DominatorTree *DT;
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@ -97,10 +79,6 @@ public:
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Value *LHS, Value *RHS);
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Expression createExtractvalueExpr(ExtractValueInst *EI);
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uint32_t lookupOrAddCall(CallInst *C);
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uint32_t phiTranslateImpl(const BasicBlock *BB, const BasicBlock *PhiBlock,
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uint32_t Num, GVN &Gvn);
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std::pair<uint32_t, bool> assignExpNewValueNum(Expression &exp);
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bool areAllValsInBB(uint32_t num, const BasicBlock *BB, GVN &Gvn);
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public:
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ValueTable();
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@ -109,12 +87,9 @@ public:
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~ValueTable();
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uint32_t lookupOrAdd(Value *V);
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uint32_t lookup(Value *V, bool Verify = true) const;
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uint32_t lookup(Value *V) const;
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uint32_t lookupOrAddCmp(unsigned Opcode, CmpInst::Predicate Pred,
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Value *LHS, Value *RHS);
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uint32_t phiTranslate(const BasicBlock *BB, const BasicBlock *PhiBlock,
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uint32_t Num, GVN &Gvn);
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void assignBlockRPONumber(Function &F);
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bool exists(Value *V) const;
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void add(Value *V, uint32_t num);
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void clear();
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@ -80,10 +80,9 @@ MaxRecurseDepth("max-recurse-depth", cl::Hidden, cl::init(1000), cl::ZeroOrMore,
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struct llvm::GVN::Expression {
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uint32_t opcode;
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Type *type;
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bool commutative;
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SmallVector<uint32_t, 4> varargs;
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Expression(uint32_t o = ~2U) : opcode(o), commutative(false) {}
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Expression(uint32_t o = ~2U) : opcode(o) {}
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bool operator==(const Expression &other) const {
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if (opcode != other.opcode)
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@ -247,7 +246,6 @@ GVN::Expression GVN::ValueTable::createExpr(Instruction *I) {
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assert(I->getNumOperands() == 2 && "Unsupported commutative instruction!");
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if (e.varargs[0] > e.varargs[1])
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std::swap(e.varargs[0], e.varargs[1]);
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e.commutative = true;
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}
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if (CmpInst *C = dyn_cast<CmpInst>(I)) {
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@ -258,7 +256,6 @@ GVN::Expression GVN::ValueTable::createExpr(Instruction *I) {
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Predicate = CmpInst::getSwappedPredicate(Predicate);
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}
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e.opcode = (C->getOpcode() << 8) | Predicate;
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e.commutative = true;
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} else if (InsertValueInst *E = dyn_cast<InsertValueInst>(I)) {
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for (InsertValueInst::idx_iterator II = E->idx_begin(), IE = E->idx_end();
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II != IE; ++II)
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@ -284,7 +281,6 @@ GVN::Expression GVN::ValueTable::createCmpExpr(unsigned Opcode,
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Predicate = CmpInst::getSwappedPredicate(Predicate);
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}
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e.opcode = (Opcode << 8) | Predicate;
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e.commutative = true;
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return e;
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}
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@ -352,25 +348,25 @@ GVN::ValueTable::~ValueTable() = default;
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/// add - Insert a value into the table with a specified value number.
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void GVN::ValueTable::add(Value *V, uint32_t num) {
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valueNumbering.insert(std::make_pair(V, num));
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if (PHINode *PN = dyn_cast<PHINode>(V))
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NumberingPhi[num] = PN;
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}
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uint32_t GVN::ValueTable::lookupOrAddCall(CallInst *C) {
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if (AA->doesNotAccessMemory(C)) {
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Expression exp = createExpr(C);
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uint32_t e = assignExpNewValueNum(exp).first;
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uint32_t &e = expressionNumbering[exp];
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if (!e) e = nextValueNumber++;
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valueNumbering[C] = e;
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return e;
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} else if (AA->onlyReadsMemory(C)) {
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Expression exp = createExpr(C);
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auto ValNum = assignExpNewValueNum(exp);
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if (ValNum.second) {
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valueNumbering[C] = ValNum.first;
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return ValNum.first;
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uint32_t &e = expressionNumbering[exp];
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if (!e) {
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e = nextValueNumber++;
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valueNumbering[C] = e;
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return e;
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}
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if (!MD) {
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uint32_t e = assignExpNewValueNum(exp).first;
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e = nextValueNumber++;
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valueNumbering[C] = e;
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return e;
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}
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@ -526,29 +522,23 @@ uint32_t GVN::ValueTable::lookupOrAdd(Value *V) {
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case Instruction::ExtractValue:
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exp = createExtractvalueExpr(cast<ExtractValueInst>(I));
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break;
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case Instruction::PHI:
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valueNumbering[V] = nextValueNumber;
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NumberingPhi[nextValueNumber] = cast<PHINode>(V);
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return nextValueNumber++;
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default:
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valueNumbering[V] = nextValueNumber;
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return nextValueNumber++;
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}
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uint32_t e = assignExpNewValueNum(exp).first;
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uint32_t& e = expressionNumbering[exp];
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if (!e) e = nextValueNumber++;
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valueNumbering[V] = e;
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return e;
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}
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/// Returns the value number of the specified value. Fails if
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/// the value has not yet been numbered.
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uint32_t GVN::ValueTable::lookup(Value *V, bool Verify) const {
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uint32_t GVN::ValueTable::lookup(Value *V) const {
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DenseMap<Value*, uint32_t>::const_iterator VI = valueNumbering.find(V);
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if (Verify) {
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assert(VI != valueNumbering.end() && "Value not numbered?");
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return VI->second;
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}
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return (VI != valueNumbering.end()) ? VI->second : 0;
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assert(VI != valueNumbering.end() && "Value not numbered?");
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return VI->second;
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}
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/// Returns the value number of the given comparison,
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@ -559,29 +549,21 @@ uint32_t GVN::ValueTable::lookupOrAddCmp(unsigned Opcode,
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CmpInst::Predicate Predicate,
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Value *LHS, Value *RHS) {
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Expression exp = createCmpExpr(Opcode, Predicate, LHS, RHS);
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return assignExpNewValueNum(exp).first;
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uint32_t& e = expressionNumbering[exp];
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if (!e) e = nextValueNumber++;
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return e;
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}
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/// Remove all entries from the ValueTable.
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void GVN::ValueTable::clear() {
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valueNumbering.clear();
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expressionNumbering.clear();
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NumberingPhi.clear();
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PhiTranslateTable.clear();
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BlockRPONumber.clear();
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nextValueNumber = 1;
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Expressions.clear();
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ExprIdx.clear();
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nextExprNumber = 0;
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}
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/// Remove a value from the value numbering.
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void GVN::ValueTable::erase(Value *V) {
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uint32_t Num = valueNumbering.lookup(V);
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valueNumbering.erase(V);
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// If V is PHINode, V <--> value number is an one-to-one mapping.
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if (isa<PHINode>(V))
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NumberingPhi.erase(Num);
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}
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/// verifyRemoved - Verify that the value is removed from all internal data
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@ -1469,97 +1451,6 @@ bool GVN::processLoad(LoadInst *L) {
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return false;
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}
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/// Return a pair the first field showing the value number of \p Exp and the
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/// second field showing whether it is a value number newly created.
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std::pair<uint32_t, bool>
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GVN::ValueTable::assignExpNewValueNum(Expression &Exp) {
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uint32_t &e = expressionNumbering[Exp];
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bool CreateNewValNum = !e;
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if (CreateNewValNum) {
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Expressions.push_back(Exp);
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if (ExprIdx.size() < nextValueNumber + 1)
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ExprIdx.resize(nextValueNumber * 2);
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e = nextValueNumber;
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ExprIdx[nextValueNumber++] = nextExprNumber++;
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}
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return {e, CreateNewValNum};
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}
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void GVN::ValueTable::assignBlockRPONumber(Function &F) {
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uint32_t NextBlockNumber = 1;
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ReversePostOrderTraversal<Function *> RPOT(&F);
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for (BasicBlock *BB : RPOT)
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BlockRPONumber[BB] = NextBlockNumber++;
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}
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/// Return whether all the values related with the same \p num are
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/// defined in \p BB.
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bool GVN::ValueTable::areAllValsInBB(uint32_t Num, const BasicBlock *BB,
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GVN &Gvn) {
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LeaderTableEntry *Vals = &Gvn.LeaderTable[Num];
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while (Vals && Vals->BB == BB)
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Vals = Vals->Next;
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return !Vals;
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}
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/// Wrap phiTranslateImpl to provide caching functionality.
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uint32_t GVN::ValueTable::phiTranslate(const BasicBlock *Pred,
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const BasicBlock *PhiBlock, uint32_t Num,
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GVN &Gvn) {
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auto FindRes = PhiTranslateTable.find({Num, Pred});
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if (FindRes != PhiTranslateTable.end())
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return FindRes->second;
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uint32_t NewNum = phiTranslateImpl(Pred, PhiBlock, Num, Gvn);
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PhiTranslateTable.insert({{Num, Pred}, NewNum});
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return NewNum;
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}
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/// Translate value number \p Num using phis, so that it has the values of
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/// the phis in BB.
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uint32_t GVN::ValueTable::phiTranslateImpl(const BasicBlock *Pred,
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const BasicBlock *PhiBlock,
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uint32_t Num, GVN &Gvn) {
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if (PHINode *PN = NumberingPhi[Num]) {
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if (BlockRPONumber[Pred] >= BlockRPONumber[PhiBlock])
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return Num;
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for (unsigned i = 0; i != PN->getNumIncomingValues(); ++i) {
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if (PN->getParent() == PhiBlock && PN->getIncomingBlock(i) == Pred)
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if (uint32_t TransVal = lookup(PN->getIncomingValue(i), false))
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return TransVal;
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}
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return Num;
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}
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// If there is any value related with Num is defined in a BB other than
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// PhiBlock, it cannot depend on a phi in PhiBlock without going through
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// a backedge. We can do an early exit in that case to save compile time.
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if (!areAllValsInBB(Num, PhiBlock, Gvn))
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return Num;
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if (ExprIdx[Num] == 0 || Num >= ExprIdx.size())
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return Num;
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Expression Exp = Expressions[ExprIdx[Num]];
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for (unsigned i = 0; i < Exp.varargs.size(); i++)
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Exp.varargs[i] = phiTranslate(Pred, PhiBlock, Exp.varargs[i], Gvn);
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if (Exp.commutative) {
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assert(Exp.varargs.size() == 2 && "Unsupported commutative expression!");
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if (Exp.varargs[0] > Exp.varargs[1]) {
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std::swap(Exp.varargs[0], Exp.varargs[1]);
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uint32_t Opcode = Exp.opcode >> 8;
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if (Opcode == Instruction::ICmp || Opcode == Instruction::FCmp)
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Exp.opcode = (Opcode << 8) |
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CmpInst::getSwappedPredicate(
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static_cast<CmpInst::Predicate>(Exp.opcode & 255));
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}
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}
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if (uint32_t NewNum = expressionNumbering[Exp])
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return NewNum;
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return Num;
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}
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// In order to find a leader for a given value number at a
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// specific basic block, we first obtain the list of all Values for that number,
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// and then scan the list to find one whose block dominates the block in
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@ -1965,7 +1856,6 @@ bool GVN::runImpl(Function &F, AssumptionCache &RunAC, DominatorTree &RunDT,
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// Fabricate val-num for dead-code in order to suppress assertion in
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// performPRE().
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assignValNumForDeadCode();
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VN.assignBlockRPONumber(F);
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bool PREChanged = true;
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while (PREChanged) {
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PREChanged = performPRE(F);
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@ -2055,9 +1945,7 @@ bool GVN::performScalarPREInsertion(Instruction *Instr, BasicBlock *Pred,
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success = false;
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break;
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}
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uint32_t TValNo =
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VN.phiTranslate(Pred, Instr->getParent(), VN.lookup(Op), *this);
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if (Value *V = findLeader(Pred, TValNo)) {
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if (Value *V = findLeader(Pred, VN.lookup(Op))) {
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Instr->setOperand(i, V);
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} else {
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success = false;
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@ -2074,12 +1962,10 @@ bool GVN::performScalarPREInsertion(Instruction *Instr, BasicBlock *Pred,
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Instr->insertBefore(Pred->getTerminator());
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Instr->setName(Instr->getName() + ".pre");
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Instr->setDebugLoc(Instr->getDebugLoc());
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unsigned Num = VN.lookupOrAdd(Instr);
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VN.add(Instr, Num);
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VN.add(Instr, ValNo);
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// Update the availability map to include the new instruction.
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addToLeaderTable(Num, Instr, Pred);
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addToLeaderTable(ValNo, Instr, Pred);
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return true;
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}
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@ -2128,8 +2014,7 @@ bool GVN::performScalarPRE(Instruction *CurInst) {
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break;
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}
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uint32_t TValNo = VN.phiTranslate(P, CurrentBlock, ValNo, *this);
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Value *predV = findLeader(P, TValNo);
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Value *predV = findLeader(P, ValNo);
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if (!predV) {
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predMap.push_back(std::make_pair(static_cast<Value *>(nullptr), P));
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PREPred = P;
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@ -1,105 +0,0 @@
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; RUN: opt < %s -gvn -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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@a = common global [100 x i64] zeroinitializer, align 16
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@b = common global [100 x i64] zeroinitializer, align 16
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@g1 = common global i64 0, align 8
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@g2 = common global i64 0, align 8
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@g3 = common global i64 0, align 8
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declare i64 @goo(...) local_unnamed_addr #1
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define void @test1(i64 %a, i64 %b, i64 %c, i64 %d) {
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entry:
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%mul = mul nsw i64 %b, %a
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store i64 %mul, i64* @g1, align 8
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%t0 = load i64, i64* @g2, align 8
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%cmp = icmp sgt i64 %t0, 3
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br i1 %cmp, label %if.then, label %if.end
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if.then: ; preds = %entry
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%mul2 = mul nsw i64 %d, %c
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store i64 %mul2, i64* @g2, align 8
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br label %if.end
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; Check phi-translate works and mul is removed.
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; CHECK-LABEL: @test1(
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; CHECK: if.end:
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; CHECK: %[[MULPHI:.*]] = phi i64 [ {{.*}}, %if.then ], [ %mul, %entry ]
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; CHECK-NOT: = mul
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; CHECK: store i64 %[[MULPHI]], i64* @g3, align 8
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if.end: ; preds = %if.then, %entry
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%b.addr.0 = phi i64 [ %d, %if.then ], [ %b, %entry ]
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%a.addr.0 = phi i64 [ %c, %if.then ], [ %a, %entry ]
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%mul3 = mul nsw i64 %a.addr.0, %b.addr.0
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store i64 %mul3, i64* @g3, align 8
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ret void
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}
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define void @test2(i64 %i) {
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entry:
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%arrayidx = getelementptr inbounds [100 x i64], [100 x i64]* @a, i64 0, i64 %i
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%t0 = load i64, i64* %arrayidx, align 8
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%arrayidx1 = getelementptr inbounds [100 x i64], [100 x i64]* @b, i64 0, i64 %i
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%t1 = load i64, i64* %arrayidx1, align 8
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%mul = mul nsw i64 %t1, %t0
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store i64 %mul, i64* @g1, align 8
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%cmp = icmp sgt i64 %mul, 3
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br i1 %cmp, label %if.then, label %if.end
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; Check phi-translate works for the phi generated by loadpre. A new mul will be
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; inserted in if.then block.
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; CHECK-LABEL: @test2(
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; CHECK: if.then:
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; CHECK: %[[MUL_THEN:.*]] = mul
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; CHECK: br label %if.end
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if.then: ; preds = %entry
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%call = tail call i64 (...) @goo() #2
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store i64 %call, i64* @g2, align 8
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br label %if.end
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; CHECK: if.end:
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; CHECK: %[[MULPHI:.*]] = phi i64 [ %[[MUL_THEN]], %if.then ], [ %mul, %entry ]
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; CHECK-NOT: = mul
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; CHECK: store i64 %[[MULPHI]], i64* @g3, align 8
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if.end: ; preds = %if.then, %entry
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%i.addr.0 = phi i64 [ 3, %if.then ], [ %i, %entry ]
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%arrayidx3 = getelementptr inbounds [100 x i64], [100 x i64]* @a, i64 0, i64 %i.addr.0
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%t2 = load i64, i64* %arrayidx3, align 8
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%arrayidx4 = getelementptr inbounds [100 x i64], [100 x i64]* @b, i64 0, i64 %i.addr.0
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%t3 = load i64, i64* %arrayidx4, align 8
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%mul5 = mul nsw i64 %t3, %t2
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store i64 %mul5, i64* @g3, align 8
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ret void
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}
|
||||
|
||||
; Check phi-translate doesn't go through backedge, which may lead to incorrect
|
||||
; pre transformation.
|
||||
; CHECK: for.end:
|
||||
; CHECK-NOT: %{{.*pre-phi}} = phi
|
||||
; CHECK: ret void
|
||||
define void @test3(i64 %N, i64* nocapture readonly %a) {
|
||||
entry:
|
||||
br label %for.cond
|
||||
|
||||
for.cond: ; preds = %for.body, %entry
|
||||
%i.0 = phi i64 [ 0, %entry ], [ %add, %for.body ]
|
||||
%add = add nuw nsw i64 %i.0, 1
|
||||
%arrayidx = getelementptr inbounds i64, i64* %a, i64 %add
|
||||
%tmp0 = load i64, i64* %arrayidx, align 8
|
||||
%cmp = icmp slt i64 %i.0, %N
|
||||
br i1 %cmp, label %for.body, label %for.end
|
||||
|
||||
for.body: ; preds = %for.cond
|
||||
%call = tail call i64 (...) @goo() #2
|
||||
%add1 = sub nsw i64 0, %call
|
||||
%tobool = icmp eq i64 %tmp0, %add1
|
||||
br i1 %tobool, label %for.cond, label %for.end
|
||||
|
||||
for.end: ; preds = %for.body, %for.cond
|
||||
%i.0.lcssa = phi i64 [ %i.0, %for.body ], [ %i.0, %for.cond ]
|
||||
%arrayidx2 = getelementptr inbounds i64, i64* %a, i64 %i.0.lcssa
|
||||
%tmp1 = load i64, i64* %arrayidx2, align 8
|
||||
store i64 %tmp1, i64* @g1, align 8
|
||||
ret void
|
||||
}
|
||||
|
||||
@ -37,7 +37,7 @@ sw.bb2: ; preds = %if.end, %entry
|
||||
%3 = load double, double* %arrayidx5, align 8
|
||||
; CHECK: sw.bb2:
|
||||
; CHECK-NOT: sext
|
||||
; CHECK: phi double [
|
||||
; CHECK-NEXT: phi double [
|
||||
; CHECK-NOT: load
|
||||
%sub6 = fsub double 3.000000e+00, %3
|
||||
br label %return
|
||||
|
||||
@ -72,7 +72,7 @@ block4:
|
||||
%PRE = load i32, i32* %P3
|
||||
ret i32 %PRE
|
||||
; CHECK: block4:
|
||||
; CHECK: phi i32 [
|
||||
; CHECK-NEXT: phi i32 [
|
||||
; CHECK-NOT: load
|
||||
; CHECK: ret i32
|
||||
}
|
||||
@ -104,7 +104,7 @@ block4:
|
||||
%PRE = load i32, i32* %P3
|
||||
ret i32 %PRE
|
||||
; CHECK: block4:
|
||||
; CHECK: phi i32 [
|
||||
; CHECK-NEXT: phi i32 [
|
||||
; CHECK-NOT: load
|
||||
; CHECK: ret i32
|
||||
}
|
||||
@ -263,7 +263,7 @@ block4:
|
||||
%PRE = load i32, i32* %P3
|
||||
ret i32 %PRE
|
||||
; CHECK: block4:
|
||||
; CHECK: phi i32 [
|
||||
; CHECK-NEXT: phi i32 [
|
||||
; CHECK-NOT: load
|
||||
; CHECK: ret i32
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user