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https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-19 19:29:31 +00:00
Fix unionSets so that it can merge correctly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30304 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -57,19 +57,19 @@ namespace {
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/// not a total ordering.
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struct compare {
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bool operator()(Value *V1, Value *V2) const {
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if (isa<Constant>(V2)) {
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if (!isa<Constant>(V1)) {
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if (isa<Constant>(V1)) {
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if (!isa<Constant>(V2)) {
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return true;
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}
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} else if (isa<Argument>(V2)) {
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if (!isa<Constant>(V1) && !isa<Argument>(V1)) {
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} else if (isa<Argument>(V1)) {
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if (!isa<Constant>(V2) && !isa<Argument>(V2)) {
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return true;
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}
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}
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if (User *U1 = dyn_cast<User>(V1)) {
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for (User::const_op_iterator I = U1->op_begin(), E = U1->op_end();
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if (User *U = dyn_cast<User>(V2)) {
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for (User::const_op_iterator I = U->op_begin(), E = U->op_end();
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I != E; ++I) {
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if (*I == V2) {
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if (*I == V1) {
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return true;
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}
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}
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@ -79,10 +79,10 @@ namespace {
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};
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/// Used for choosing the canonical Value in a synonym set.
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/// Leaves the better one in V1.
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/// Leaves the better choice in V1.
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static void order(Value *&V1, Value *&V2) {
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static compare c;
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if (c(V1, V2))
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if (c(V2, V1))
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std::swap(V1, V2);
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}
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@ -139,8 +139,8 @@ namespace {
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I = mapping.begin(), E = mapping.end(); I != E; ++I) {
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if ((*I).second == i && (*I).first != leaders[i-1]) {
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os << *(*I).first << " ";
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}
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}
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}
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}
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os << "]\n";
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}
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}
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@ -153,33 +153,38 @@ namespace {
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/// existing disjoint synonym sets were combined. The iterator
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/// points to the removed element.
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iterator unionSets(ElemTy E1, ElemTy E2) {
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if (swo(E1, E2)) std::swap(E1, E2);
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if (swo(E2, E1)) std::swap(E1, E2);
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iterator I1 = findLeader(E1);
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iterator I2 = findLeader(E2);
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iterator I1 = findLeader(E1),
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I2 = findLeader(E2);
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if (!I1 && !I2) { // neither entry is in yet
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leaders.push_back(E1);
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I1 = leaders.size();
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mapping[E1] = I1;
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mapping[E2] = I1;
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return false;
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return 0;
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}
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if (!I1 && I2) {
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mapping[E1] = I2;
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return false;
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std::swap(getLeader(I2), E1);
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return 0;
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}
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if (I1 && !I2) {
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mapping[E2] = I1;
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return false;
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return 0;
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}
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if (I1 == I2) return 0;
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// This is the case where we have two sets, [%a1, %a2, %a3] and
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// [%p1, %p2, %p3] and someone says that %a2 == %p3. We need to
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// combine the two synsets.
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if (I1 > I2) --I1;
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for (std::map<Value *, unsigned>::iterator I = mapping.begin(),
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E = mapping.end(); I != E; ++I) {
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if (I->second == I2) I->second = I1;
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@ -188,7 +193,7 @@ namespace {
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leaders.erase(leaders.begin() + I2 - 1);
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return true;
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return I2;
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}
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/// Returns an iterator pointing to the synonym set containing
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@ -238,7 +243,7 @@ namespace {
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void addEqual(Value *V1, Value *V2) {
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// If %x = 0. and %y = -0., seteq %x, %y is true, but
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// copysign(%x) is not the same as copysign(%y).
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if (V2->getType()->isFloatingPoint()) return;
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if (V1->getType()->isFloatingPoint()) return;
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order(V1, V2);
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if (isa<Constant>(V2)) return; // refuse to set false == true.
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@ -261,7 +266,10 @@ namespace {
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void addNotEqual(Value *V1, Value *V2) {
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// If %x = NAN then seteq %x, %x is false.
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if (V2->getType()->isFloatingPoint()) return;
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if (V1->getType()->isFloatingPoint()) return;
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// For example, %x = setne int 0, 0 causes "0 != 0".
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if (isa<Constant>(V1) && isa<Constant>(V2)) return;
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DEBUG(std::cerr << "not equal: " << *V1 << " and " << *V2 << "\n");
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if (findProperty(NE, V1, V2) != Properties.end())
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@ -270,6 +278,10 @@ namespace {
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// Add the property.
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SynonymIterator I1 = union_find.findOrInsert(V1),
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I2 = union_find.findOrInsert(V2);
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// Technically this means that the block is unreachable.
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if (I1 == I2) return;
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Properties.push_back(Property(NE, I1, I2));
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addImpliedProperties(NE, V1, V2);
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}
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@ -607,7 +619,7 @@ void PredicateSimplifier::visitInstruction(Instruction *I,
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// Try to replace the whole instruction.
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Value *V = resolve(I, KnownProperties);
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assert(V && "resolve not supposed to return NULL.");
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assert(V->getType() == I->getType() && "Instruction type mutated!");
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if (V != I) {
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modified = true;
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++NumInstruction;
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@ -620,7 +632,7 @@ void PredicateSimplifier::visitInstruction(Instruction *I,
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for (unsigned i = 0, e = I->getNumOperands(); i != e; ++i) {
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Value *Oper = I->getOperand(i);
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Value *V = resolve(Oper, KnownProperties);
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assert(V && "resolve not supposed to return NULL.");
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assert(V->getType() == Oper->getType() && "Operand type mutated!");
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if (V != Oper) {
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modified = true;
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++NumVarsReplaced;
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