SetId Approximator::function_rhs_val(const Function& fun, SetId rhs, SetId val,
Parity parity) const {
POMAGMA_ASSERT1(rhs, "rhs is undefined");
POMAGMA_ASSERT1(val, "val is undefined");
POMAGMA_ASSERT1(parity == NABOVE or parity == NBELOW, "invalid parity");
const bool upward = (parity == NBELOW);
const DenseSet& support = m_structure.carrier().support();
const DenseSet rhs_set = m_sets.load(rhs); // positive
const DenseSet val_set = m_sets.load(val); // negative
DenseSet lhs_set(m_item_dim); // negative
for (auto iter = support.iter_diff(lhs_set); iter.ok(); iter.next()) {
Ob lhs = *iter;
if (unlikely(lhs_set.contains(lhs))) continue; // iterator latency
for (auto iter = fun.get_Lx_set(lhs).iter_insn(rhs_set); iter.ok();
iter.next()) {
Ob rhs = *iter;
Ob val = fun.find(lhs, rhs);
if (val_set.contains(val)) {
convex_insert(lhs_set, lhs, upward);
break;
}
}
}
return m_sets.store(std::move(lhs_set));
}
void LoopInfo::verifyAnalysis() const {
// LoopInfo is a FunctionPass, but verifying every loop in the function
// each time verifyAnalysis is called is very expensive. The
// -verify-loop-info option can enable this. In order to perform some
// checking by default, LoopPass has been taught to call verifyLoop
// manually during loop pass sequences.
if (!VerifyLoopInfo) return;
DenseSet<const Loop*> Loops;
for (iterator I = begin(), E = end(); I != E; ++I) {
assert(!(*I)->getParentLoop() && "Top-level loop has a parent!");
(*I)->verifyLoopNest(&Loops);
}
// Verify that blocks are mapped to valid loops.
//
// FIXME: With an up-to-date DFS (see LoopIterator.h) and DominatorTree, we
// could also verify that the blocks are still in the correct loops.
for (DenseMap<BasicBlock*, Loop*>::const_iterator I = LI.BBMap.begin(),
E = LI.BBMap.end(); I != E; ++I) {
assert(Loops.count(I->second) && "orphaned loop");
assert(I->second->contains(I->first) && "orphaned block");
}
}
void AliasAnalysisChecker::collectMissingAliases(
const DenseSet<ValuePair> &DynamicAliases,
vector<ValuePair> &MissingAliases) {
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
AliasAnalysis &BaselineAA = getAnalysis<BaselineAliasAnalysis>();
MissingAliases.clear();
for (DenseSet<ValuePair>::const_iterator I = DynamicAliases.begin();
I != DynamicAliases.end(); ++I) {
Value *V1 = I->first, *V2 = I->second;
if (IntraProc && !DynAAUtils::IsIntraProcQuery(V1, V2)) {
continue;
}
// Ignore BitCasts and PhiNodes. The reports on them are typically
// redundant.
if (isa<BitCastInst>(V1) || isa<BitCastInst>(V2))
continue;
if (isa<PHINode>(V1) || isa<PHINode>(V2))
continue;
if (!CheckAllPointers) {
if (!DynAAUtils::PointerIsDereferenced(V1) ||
!DynAAUtils::PointerIsDereferenced(V2)) {
continue;
}
}
if (BaselineAA.alias(V1, V2) != AliasAnalysis::NoAlias &&
AA.alias(V1, V2) == AliasAnalysis::NoAlias) {
MissingAliases.push_back(make_pair(V1, V2));
}
}
}
// Returns all flat address expressions in function F. The elements are
// If V is an unvisited flat address expression, appends V to PostorderStack
// and marks it as visited.
void InferAddressSpaces::appendsFlatAddressExpressionToPostorderStack(
Value *V, std::vector<std::pair<Value *, bool>> &PostorderStack,
DenseSet<Value *> &Visited) const {
assert(V->getType()->isPointerTy());
// Generic addressing expressions may be hidden in nested constant
// expressions.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
// TODO: Look in non-address parts, like icmp operands.
if (isAddressExpression(*CE) && Visited.insert(CE).second)
PostorderStack.push_back(std::make_pair(CE, false));
return;
}
if (isAddressExpression(*V) &&
V->getType()->getPointerAddressSpace() == FlatAddrSpace) {
if (Visited.insert(V).second) {
PostorderStack.push_back(std::make_pair(V, false));
Operator *Op = cast<Operator>(V);
for (unsigned I = 0, E = Op->getNumOperands(); I != E; ++I) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Op->getOperand(I))) {
if (isAddressExpression(*CE) && Visited.insert(CE).second)
PostorderStack.emplace_back(CE, false);
}
}
}
}
}
bool searchPredecessors(const MachineBasicBlock *MBB,
const MachineBasicBlock *CutOff,
UnaryPredicate Predicate) {
if (MBB == CutOff)
return false;
DenseSet<const MachineBasicBlock*> Visited;
SmallVector<MachineBasicBlock*, 4> Worklist(MBB->pred_begin(),
MBB->pred_end());
while (!Worklist.empty()) {
MachineBasicBlock *MBB = Worklist.pop_back_val();
if (!Visited.insert(MBB).second)
continue;
if (MBB == CutOff)
continue;
if (Predicate(MBB))
return true;
Worklist.append(MBB->pred_begin(), MBB->pred_end());
}
return false;
}
void GraphBuilder::visitPtrToIntInst(PtrToIntInst& I) {
DSNode* N = getValueDest(I.getOperand(0)).getNode();
if(I.hasOneUse()) {
if(isa<ICmpInst>(*(I.use_begin()))) {
NumBoringIntToPtr++;
return;
}
}
if(I.hasOneUse()) {
Value *V = dyn_cast<Value>(*(I.use_begin()));
DenseSet<Value *> Seen;
while(V && V->hasOneUse() &&
Seen.insert(V).second) {
if(isa<LoadInst>(V))
break;
if(isa<StoreInst>(V))
break;
if(isa<CallInst>(V))
break;
V = dyn_cast<Value>(*(V->use_begin()));
}
if(isa<BranchInst>(V)){
NumBoringIntToPtr++;
return;
}
}
if(N)
N->setPtrToIntMarker();
}
// Check PHI instructions at the beginning of MBB. It is assumed that
// calcRegsPassed has been run so BBInfo::isLiveOut is valid.
void MachineVerifier::checkPHIOps(const MachineBasicBlock *MBB) {
for (MachineBasicBlock::const_iterator BBI = MBB->begin(), BBE = MBB->end();
BBI != BBE && BBI->isPHI(); ++BBI) {
DenseSet<const MachineBasicBlock*> seen;
for (unsigned i = 1, e = BBI->getNumOperands(); i != e; i += 2) {
unsigned Reg = BBI->getOperand(i).getReg();
const MachineBasicBlock *Pre = BBI->getOperand(i + 1).getMBB();
if (!Pre->isSuccessor(MBB))
continue;
seen.insert(Pre);
BBInfo &PrInfo = MBBInfoMap[Pre];
if (PrInfo.reachable && !PrInfo.isLiveOut(Reg))
report("PHI operand is not live-out from predecessor",
&BBI->getOperand(i), i);
}
// Did we see all predecessors?
for (MachineBasicBlock::const_pred_iterator PrI = MBB->pred_begin(),
PrE = MBB->pred_end(); PrI != PrE; ++PrI) {
if (!seen.count(*PrI)) {
report("Missing PHI operand", BBI);
*OS << "BB#" << (*PrI)->getNumber()
<< " is a predecessor according to the CFG.\n";
}
}
}
}
// Collects missing aliases to <MissingAliases>.
void AliasAnalysisChecker::collectMissingAliases(
const DenseSet<ValuePair> &DynamicAliases) {
AliasAnalysis &AA = getAnalysis<AliasAnalysis>();
AliasAnalysis &BaselineAA = getAnalysis<BaselineAliasAnalysis>();
MissingAliases.clear();
for (DenseSet<ValuePair>::const_iterator I = DynamicAliases.begin();
I != DynamicAliases.end(); ++I) {
Value *V1 = I->first, *V2 = I->second;
if (IntraProc && !DynAAUtils::IsIntraProcQuery(V1, V2)) {
continue;
}
if (!CheckAllPointers) {
if (!DynAAUtils::PointerIsDereferenced(V1) ||
!DynAAUtils::PointerIsDereferenced(V2)) {
continue;
}
}
if (BaselineAA.alias(V1, V2) != AliasAnalysis::NoAlias &&
AA.alias(V1, V2) == AliasAnalysis::NoAlias) {
MissingAliases.push_back(make_pair(V1, V2));
}
}
}
void DebugTypeInfoRemoval::traverse(MDNode *N) {
if (!N || Replacements.count(N))
return;
// To avoid cycles, as well as for efficiency sake, we will sometimes prune
// parts of the graph.
auto prune = [](MDNode *Parent, MDNode *Child) {
if (auto *MDS = dyn_cast<DISubprogram>(Parent))
return Child == MDS->getVariables().get();
return false;
};
SmallVector<MDNode *, 16> ToVisit;
DenseSet<MDNode *> Opened;
// Visit each node starting at N in post order, and map them.
ToVisit.push_back(N);
while (!ToVisit.empty()) {
auto *N = ToVisit.back();
if (!Opened.insert(N).second) {
// Close it.
remap(N);
ToVisit.pop_back();
continue;
}
for (auto &I : N->operands())
if (auto *MDN = dyn_cast_or_null<MDNode>(I))
if (!Opened.count(MDN) && !Replacements.count(MDN) && !prune(N, MDN) &&
!isa<DICompileUnit>(MDN))
ToVisit.push_back(MDN);
}
}
/// setSubgraphColorHelper - Implement setSubgraphColor. Return
/// whether we truncated the search.
///
bool SelectionDAG::setSubgraphColorHelper(SDNode *N, const char *Color, DenseSet<SDNode *> &visited,
int level, bool &printed) {
bool hit_limit = false;
#ifndef NDEBUG
if (level >= 20) {
if (!printed) {
printed = true;
DEBUG(errs() << "setSubgraphColor hit max level\n");
}
return true;
}
unsigned oldSize = visited.size();
visited.insert(N);
if (visited.size() != oldSize) {
setGraphColor(N, Color);
for(SDNodeIterator i = SDNodeIterator::begin(N), iend = SDNodeIterator::end(N);
i != iend;
++i) {
hit_limit = setSubgraphColorHelper(*i, Color, visited, level+1, printed) || hit_limit;
}
}
#else
errs() << "SelectionDAG::setSubgraphColor is only available in debug builds"
<< " on systems with Graphviz or gv!\n";
#endif
return hit_limit;
}
static void MarkNodesWhichMustBePassedIn(DenseSet<const DSNode*> &MarkedNodes,
Function &F, DSGraph* G,
EntryPointAnalysis* EPA) {
// All DSNodes reachable from arguments must be passed in...
// Unless this is an entry point to the program
if (!EPA->isEntryPoint(&F)) {
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end();
I != E; ++I) {
DSGraph::ScalarMapTy::iterator AI = G->getScalarMap().find(I);
if (AI != G->getScalarMap().end())
if (DSNode * N = AI->second.getNode())
N->markReachableNodes(MarkedNodes);
}
}
// Marked the returned node as needing to be passed in.
if (DSNode * RetNode = G->getReturnNodeFor(F).getNode())
RetNode->markReachableNodes(MarkedNodes);
// Calculate which DSNodes are reachable from globals. If a node is reachable
// from a global, we will create a global pool for it, so no argument passage
// is required.
DenseSet<const DSNode*> NodesFromGlobals;
GetNodesReachableFromGlobals(G, NodesFromGlobals);
// Remove any nodes reachable from a global. These nodes will be put into
// global pools, which do not require arguments to be passed in.
for (DenseSet<const DSNode*>::iterator I = NodesFromGlobals.begin(),
E = NodesFromGlobals.end(); I != E; ++I)
MarkedNodes.erase(*I);
}
//
// Method: findGlobalPoolNodes()
//
// Description:
// This method finds DSNodes that are reachable from globals and that need a
// pool. The Automatic Pool Allocation transform will use the returned
// information to build global pools for the DSNodes in question.
//
// Note that this method does not assign DSNodes to pools; it merely decides
// which DSNodes are reachable from globals and will need a pool of global
// scope.
//
// Outputs:
// Nodes - The DSNodes that are both reachable from globals and which should
// have global pools will be *added* to this container.
//
void
Heuristic::findGlobalPoolNodes (DSNodeSet_t & Nodes) {
// Get the globals graph for the program.
DSGraph* GG = Graphs->getGlobalsGraph();
// Get all of the nodes reachable from globals.
DenseSet<const DSNode*> GlobalHeapNodes;
GetNodesReachableFromGlobals (GG, GlobalHeapNodes);
//
// Now find all DSNodes belonging to function-local DSGraphs which are
// mirrored in the globals graph. These DSNodes require a global pool, too.
//
for (Module::iterator F = M->begin(); F != M->end(); ++F) {
if (Graphs->hasDSGraph(*F)) {
DSGraph* G = Graphs->getDSGraph(*F);
GetNodesReachableFromGlobals (G, GlobalHeapNodes);
}
}
//
// Copy the values into the output container. Note that DenseSet has no
// iterator traits (or whatever allows us to treat DenseSet has a generic
// container), so we have to use a loop to copy values from the DenseSet into
// the output container.
//
for (DenseSet<const DSNode*>::iterator I = GlobalHeapNodes.begin(),
E = GlobalHeapNodes.end(); I != E; ++I) {
Nodes.insert (*I);
}
return;
}
static bool IsUndefinedPhiRecursive(Value *V) {
SmallVector<Value*, 4> Worklist;
DenseSet<const Value *> VisitedValues;
Worklist.push_back(V);
VisitedValues.insert(V);
while (!Worklist.empty()) {
Value *CurValue = Worklist.back();
Worklist.pop_back();
if (!CanCheckValue(CurValue))
continue;
if (auto *Phi = dyn_cast<PHINode>(CurValue)) {
for (Value *InV : Phi->incoming_values()) {
if (isa<UndefValue>(InV))
return true;
}
}
if (User *U = dyn_cast<User>(CurValue)) {
for (Value *V : U->operands())
if (VisitedValues.insert(V).second)
Worklist.push_back(V);
}
}
return false;
}
void Server::aggregate (const std::string & survey_in)
{
Structure survey;
survey.load(survey_in);
if (POMAGMA_DEBUG_LEVEL > 1) {
survey.validate();
}
compact(m_structure);
if (POMAGMA_DEBUG_LEVEL > 1) {
m_structure.validate();
}
DenseSet defined = restricted(survey.signature(), m_structure.signature());
size_t total_dim =
m_structure.carrier().item_count() + defined.count_items();
if (m_structure.carrier().item_dim() < total_dim) {
m_structure.resize(total_dim);
if (POMAGMA_DEBUG_LEVEL > 1) {
m_structure.validate();
}
}
pomagma::aggregate(m_structure, survey, defined);
if (POMAGMA_DEBUG_LEVEL > 1) {
m_structure.validate();
}
}
void LazyValueInfoCache::threadEdge(BasicBlock *PredBB, BasicBlock *OldSucc,
BasicBlock *NewSucc) {
// When an edge in the graph has been threaded, values that we could not
// determine a value for before (i.e. were marked overdefined) may be possible
// to solve now. We do NOT try to proactively update these values. Instead,
// we clear their entries from the cache, and allow lazy updating to recompute
// them when needed.
// The updating process is fairly simple: we need to dropped cached info
// for all values that were marked overdefined in OldSucc, and for those same
// values in any successor of OldSucc (except NewSucc) in which they were
// also marked overdefined.
std::vector<BasicBlock*> worklist;
worklist.push_back(OldSucc);
DenseSet<Value*> ClearSet;
for (DenseSet<OverDefinedPairTy>::iterator I = OverDefinedCache.begin(),
E = OverDefinedCache.end(); I != E; ++I) {
if (I->first == OldSucc)
ClearSet.insert(I->second);
}
// Use a worklist to perform a depth-first search of OldSucc's successors.
// NOTE: We do not need a visited list since any blocks we have already
// visited will have had their overdefined markers cleared already, and we
// thus won't loop to their successors.
while (!worklist.empty()) {
BasicBlock *ToUpdate = worklist.back();
worklist.pop_back();
// Skip blocks only accessible through NewSucc.
if (ToUpdate == NewSucc) continue;
bool changed = false;
for (DenseSet<Value*>::iterator I = ClearSet.begin(), E = ClearSet.end();
I != E; ++I) {
// If a value was marked overdefined in OldSucc, and is here too...
DenseSet<OverDefinedPairTy>::iterator OI =
OverDefinedCache.find(std::make_pair(ToUpdate, *I));
if (OI == OverDefinedCache.end()) continue;
// Remove it from the caches.
ValueCacheEntryTy &Entry = ValueCache[LVIValueHandle(*I, this)];
ValueCacheEntryTy::iterator CI = Entry.find(ToUpdate);
assert(CI != Entry.end() && "Couldn't find entry to update?");
Entry.erase(CI);
OverDefinedCache.erase(OI);
// If we removed anything, then we potentially need to update
// blocks successors too.
changed = true;
}
if (!changed) continue;
worklist.insert(worklist.end(), succ_begin(ToUpdate), succ_end(ToUpdate));
}
}
/// Model the effect of an instruction on the set of available values.
static void TransferInstruction(const Instruction &I, bool &Cleared,
DenseSet<const Value *> &Available) {
if (isStatepoint(I)) {
Cleared = true;
Available.clear();
} else if (containsGCPtrType(I.getType()))
Available.insert(&I);
}
inline void Approximator::map(const BinaryFunction& fun,
const DenseSet& lhs_set, const DenseSet& rhs_set,
DenseSet& val_set, DenseSet& temp_set) {
POMAGMA_ASSERT_EQ(lhs_set.item_dim(), m_item_dim);
POMAGMA_ASSERT_EQ(rhs_set.item_dim(), m_item_dim);
POMAGMA_ASSERT_EQ(val_set.item_dim(), m_item_dim);
POMAGMA_ASSERT_EQ(temp_set.item_dim(), m_item_dim);
for (auto iter = lhs_set.iter(); iter.ok(); iter.next()) {
Ob lhs = *iter;
// optimize for special cases of APP and COMP
if (Ob lhs_top = fun.find(lhs, m_top)) {
if (Ob lhs_bot = fun.find(lhs, m_bot)) {
bool lhs_is_constant = (lhs_top == lhs_bot);
if (lhs_is_constant) {
val_set.raw_insert(lhs_top);
continue;
}
}
}
temp_set.set_insn(rhs_set, fun.get_Lx_set(lhs));
for (auto iter = temp_set.iter(); iter.ok(); iter.next()) {
Ob rhs = *iter;
Ob val = fun.find(lhs, rhs);
val_set.raw_insert(val);
}
}
}
/// Return the baseType for Val which states whether Val is exclusively
/// derived from constant/null, or not exclusively derived from constant.
/// Val is exclusively derived off a constant base when all operands of phi and
/// selects are derived off a constant base.
static enum BaseType getBaseType(const Value *Val) {
SmallVector<const Value *, 32> Worklist;
DenseSet<const Value *> Visited;
bool isExclusivelyDerivedFromNull = true;
Worklist.push_back(Val);
// Strip through all the bitcasts and geps to get base pointer. Also check for
// the exclusive value when there can be multiple base pointers (through phis
// or selects).
while(!Worklist.empty()) {
const Value *V = Worklist.pop_back_val();
if (!Visited.insert(V).second)
continue;
if (const auto *CI = dyn_cast<CastInst>(V)) {
Worklist.push_back(CI->stripPointerCasts());
continue;
}
if (const auto *GEP = dyn_cast<GetElementPtrInst>(V)) {
Worklist.push_back(GEP->getPointerOperand());
continue;
}
// Push all the incoming values of phi node into the worklist for
// processing.
if (const auto *PN = dyn_cast<PHINode>(V)) {
for (Value *InV: PN->incoming_values())
Worklist.push_back(InV);
continue;
}
if (const auto *SI = dyn_cast<SelectInst>(V)) {
// Push in the true and false values
Worklist.push_back(SI->getTrueValue());
Worklist.push_back(SI->getFalseValue());
continue;
}
if (isa<Constant>(V)) {
// We found at least one base pointer which is non-null, so this derived
// pointer is not exclusively derived from null.
if (V != Constant::getNullValue(V->getType()))
isExclusivelyDerivedFromNull = false;
// Continue processing the remaining values to make sure it's exclusively
// constant.
continue;
}
// At this point, we know that the base pointer is not exclusively
// constant.
return BaseType::NonConstant;
}
// Now, we know that the base pointer is exclusively constant, but we need to
// differentiate between exclusive null constant and non-null constant.
return isExclusivelyDerivedFromNull ? BaseType::ExclusivelyNull
: BaseType::ExclusivelySomeConstant;
}
static void addDefsUsesToList(const MachineInstr &MI,
DenseSet<unsigned> &RegDefs,
DenseSet<unsigned> &PhysRegUses) {
for (const MachineOperand &Op : MI.operands()) {
if (Op.isReg()) {
if (Op.isDef())
RegDefs.insert(Op.getReg());
else if (Op.readsReg() &&
TargetRegisterInfo::isPhysicalRegister(Op.getReg()))
PhysRegUses.insert(Op.getReg());
}
}
}
bool AliasAnalysisChecker::runOnModule(Module &M) {
DenseSet<ValuePair> DynamicAliases;
collectDynamicAliases(DynamicAliases);
NumDynamicAliases = DynamicAliases.size();
vector<ValuePair> MissingAliases;
collectMissingAliases(DynamicAliases, MissingAliases);
sortMissingAliases(MissingAliases);
reportMissingAliases(MissingAliases);
return false;
}
bool LoopReroll::DAGRootTracker::collectUsedInstructions(SmallInstructionSet &PossibleRedSet) {
// Populate the MapVector with all instructions in the block, in order first,
// so we can iterate over the contents later in perfect order.
for (auto &I : *L->getHeader()) {
Uses[&I].resize(IL_End);
}
SmallInstructionSet Exclude;
Exclude.insert(Roots.begin(), Roots.end());
Exclude.insert(LoopIncs.begin(), LoopIncs.end());
DenseSet<Instruction*> VBase;
collectInLoopUserSet(IV, Exclude, PossibleRedSet, VBase);
for (auto *I : VBase) {
Uses[I].set(0);
}
unsigned Idx = 1;
for (auto *Root : Roots) {
DenseSet<Instruction*> V;
collectInLoopUserSet(Root, Exclude, PossibleRedSet, V);
// While we're here, check the use sets are the same size.
if (V.size() != VBase.size()) {
DEBUG(dbgs() << "LRR: Aborting - use sets are different sizes\n");
return false;
}
for (auto *I : V) {
Uses[I].set(Idx);
}
++Idx;
}
// Make sure the loop increments are also accounted for.
Exclude.clear();
Exclude.insert(Roots.begin(), Roots.end());
DenseSet<Instruction*> V;
collectInLoopUserSet(LoopIncs, Exclude, PossibleRedSet, V);
for (auto *I : V) {
Uses[I].set(IL_LoopIncIdx);
}
if (IV != RealIV)
Uses[RealIV].set(IL_LoopIncIdx);
return true;
}
// Collect the set of all users of the provided root instruction. This set of
// users contains not only the direct users of the root instruction, but also
// all users of those users, and so on. There are two exceptions:
//
// 1. Instructions in the set of excluded instructions are never added to the
// use set (even if they are users). This is used, for example, to exclude
// including root increments in the use set of the primary IV.
//
// 2. Instructions in the set of final instructions are added to the use set
// if they are users, but their users are not added. This is used, for
// example, to prevent a reduction update from forcing all later reduction
// updates into the use set.
void LoopReroll::DAGRootTracker::collectInLoopUserSet(
Instruction *Root, const SmallInstructionSet &Exclude,
const SmallInstructionSet &Final,
DenseSet<Instruction *> &Users) {
SmallInstructionVector Queue(1, Root);
while (!Queue.empty()) {
Instruction *I = Queue.pop_back_val();
if (!Users.insert(I).second)
continue;
if (!Final.count(I))
for (Use &U : I->uses()) {
Instruction *User = cast<Instruction>(U.getUser());
if (PHINode *PN = dyn_cast<PHINode>(User)) {
// Ignore "wrap-around" uses to PHIs of this loop's header.
if (PN->getIncomingBlock(U) == L->getHeader())
continue;
}
if (L->contains(User) && !Exclude.count(User)) {
Queue.push_back(User);
}
}
// We also want to collect single-user "feeder" values.
for (User::op_iterator OI = I->op_begin(),
OIE = I->op_end(); OI != OIE; ++OI) {
if (Instruction *Op = dyn_cast<Instruction>(*OI))
if (Op->hasOneUse() && L->contains(Op) && !Exclude.count(Op) &&
!Final.count(Op))
Queue.push_back(Op);
}
}
}
static void shuffleValueUseLists(Value *V, std::minstd_rand0 &Gen,
DenseSet<Value *> &Seen) {
if (!Seen.insert(V).second)
return;
if (auto *C = dyn_cast<Constant>(V))
if (!isa<GlobalValue>(C))
for (Value *Op : C->operands())
shuffleValueUseLists(Op, Gen, Seen);
if (V->use_empty() || std::next(V->use_begin()) == V->use_end())
// Nothing to shuffle for 0 or 1 users.
return;
// Generate random numbers between 10 and 99, which will line up nicely in
// debug output. We're not worried about collisons here.
DEBUG(dbgs() << "V = "; V->dump());
std::uniform_int_distribution<short> Dist(10, 99);
SmallDenseMap<const Use *, short, 16> Order;
for (const Use &U : V->uses()) {
auto I = Dist(Gen);
Order[&U] = I;
DEBUG(dbgs() << " - order: " << I << ", U = "; U.getUser()->dump());
}
DEBUG(dbgs() << " => shuffle\n");
V->sortUseList(
[&Order](const Use &L, const Use &R) { return Order[&L] < Order[&R]; });
DEBUG({
for (const Use &U : V->uses())
DEBUG(dbgs() << " - order: " << Order.lookup(&U) << ", U = ";
U.getUser()->dump());
});
/// ProcessPHI - Process PHI node in TailBB by turning it into a copy in PredBB.
/// Remember the source register that's contributed by PredBB and update SSA
/// update map.
void TailDuplicatePass::ProcessPHI(MachineInstr *MI,
MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB,
DenseMap<unsigned, unsigned> &LocalVRMap,
SmallVector<std::pair<unsigned,unsigned>, 4> &Copies,
const DenseSet<unsigned> &RegsUsedByPhi,
bool Remove) {
unsigned DefReg = MI->getOperand(0).getReg();
unsigned SrcOpIdx = getPHISrcRegOpIdx(MI, PredBB);
assert(SrcOpIdx && "Unable to find matching PHI source?");
unsigned SrcReg = MI->getOperand(SrcOpIdx).getReg();
const TargetRegisterClass *RC = MRI->getRegClass(DefReg);
LocalVRMap.insert(std::make_pair(DefReg, SrcReg));
// Insert a copy from source to the end of the block. The def register is the
// available value liveout of the block.
unsigned NewDef = MRI->createVirtualRegister(RC);
Copies.push_back(std::make_pair(NewDef, SrcReg));
if (isDefLiveOut(DefReg, TailBB, MRI) || RegsUsedByPhi.count(DefReg))
AddSSAUpdateEntry(DefReg, NewDef, PredBB);
if (!Remove)
return;
// Remove PredBB from the PHI node.
MI->RemoveOperand(SrcOpIdx+1);
MI->RemoveOperand(SrcOpIdx);
if (MI->getNumOperands() == 1)
MI->eraseFromParent();
}
/// DuplicateInstruction - Duplicate a TailBB instruction to PredBB and update
/// the source operands due to earlier PHI translation.
void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB,
MachineFunction &MF,
DenseMap<unsigned, unsigned> &LocalVRMap,
const DenseSet<unsigned> &UsedByPhi) {
MachineInstr *NewMI = TII->duplicate(MI, MF);
for (unsigned i = 0, e = NewMI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = NewMI->getOperand(i);
if (!MO.isReg())
continue;
unsigned Reg = MO.getReg();
if (!TargetRegisterInfo::isVirtualRegister(Reg))
continue;
if (MO.isDef()) {
const TargetRegisterClass *RC = MRI->getRegClass(Reg);
unsigned NewReg = MRI->createVirtualRegister(RC);
MO.setReg(NewReg);
LocalVRMap.insert(std::make_pair(Reg, NewReg));
if (isDefLiveOut(Reg, TailBB, MRI) || UsedByPhi.count(Reg))
AddSSAUpdateEntry(Reg, NewReg, PredBB);
} else {
DenseMap<unsigned, unsigned>::iterator VI = LocalVRMap.find(Reg);
if (VI != LocalVRMap.end())
MO.setReg(VI->second);
}
}
PredBB->insert(PredBB->end(), NewMI);
}
void ModuleLinker::dropReplacedComdat(
GlobalValue &GV, const DenseSet<const Comdat *> &ReplacedDstComdats) {
Comdat *C = GV.getComdat();
if (!C)
return;
if (!ReplacedDstComdats.count(C))
return;
if (GV.use_empty()) {
GV.eraseFromParent();
return;
}
if (auto *F = dyn_cast<Function>(&GV)) {
F->deleteBody();
} else if (auto *Var = dyn_cast<GlobalVariable>(&GV)) {
Var->setInitializer(nullptr);
} else {
auto &Alias = cast<GlobalAlias>(GV);
Module &M = *Alias.getParent();
PointerType &Ty = *cast<PointerType>(Alias.getType());
GlobalValue *Declaration;
if (auto *FTy = dyn_cast<FunctionType>(Alias.getValueType())) {
Declaration = Function::Create(FTy, GlobalValue::ExternalLinkage, "", &M);
} else {
Declaration =
new GlobalVariable(M, Ty.getElementType(), /*isConstant*/ false,
GlobalValue::ExternalLinkage,
/*Initializer*/ nullptr);
}
Declaration->takeName(&Alias);
Alias.replaceAllUsesWith(Declaration);
Alias.eraseFromParent();
}
}
void BitcodeFile::parse(DenseSet<StringRef> &ComdatGroups) {
LLVMContext Context;
std::unique_ptr<IRObjectFile> Obj = check(IRObjectFile::create(MB, Context));
const Module &M = Obj->getModule();
DenseSet<const Comdat *> KeptComdats;
for (const auto &P : M.getComdatSymbolTable()) {
StringRef N = Saver.save(P.first());
if (ComdatGroups.insert(N).second)
KeptComdats.insert(&P.second);
}
for (const BasicSymbolRef &Sym : Obj->symbols())
if (!shouldSkip(Sym))
SymbolBodies.push_back(createSymbolBody(KeptComdats, *Obj, Sym));
}
static void scanOneBB(Instruction *Start, Instruction *End,
std::vector<CallInst *> &Calls,
DenseSet<BasicBlock *> &Seen,
std::vector<BasicBlock *> &Worklist) {
for (BasicBlock::iterator BBI(Start), BBE0 = Start->getParent()->end(),
BBE1 = BasicBlock::iterator(End);
BBI != BBE0 && BBI != BBE1; BBI++) {
if (CallInst *CI = dyn_cast<CallInst>(&*BBI))
Calls.push_back(CI);
// FIXME: This code does not handle invokes
assert(!isa<InvokeInst>(&*BBI) &&
"support for invokes in poll code needed");
// Only add the successor blocks if we reach the terminator instruction
// without encountering end first
if (BBI->isTerminator()) {
BasicBlock *BB = BBI->getParent();
for (BasicBlock *Succ : successors(BB)) {
if (Seen.insert(Succ).second) {
Worklist.push_back(Succ);
}
}
}
}
}
MachineConstantPool::~MachineConstantPool() {
// A constant may be a member of both Constants and MachineCPVsSharingEntries,
// so keep track of which we've deleted to avoid double deletions.
DenseSet<MachineConstantPoolValue*> Deleted;
for (unsigned i = 0, e = Constants.size(); i != e; ++i)
if (Constants[i].isMachineConstantPoolEntry()) {
Deleted.insert(Constants[i].Val.MachineCPVal);
delete Constants[i].Val.MachineCPVal;
}
for (DenseSet<MachineConstantPoolValue*>::iterator I =
MachineCPVsSharingEntries.begin(), E = MachineCPVsSharingEntries.end();
I != E; ++I) {
if (Deleted.count(*I) == 0)
delete *I;
}
}
/// DuplicateInstruction - Duplicate a TailBB instruction to PredBB and update
/// the source operands due to earlier PHI translation.
void TailDuplicatePass::DuplicateInstruction(MachineInstr *MI,
MachineBasicBlock *TailBB,
MachineBasicBlock *PredBB,
MachineFunction &MF,
DenseMap<unsigned, unsigned> &LocalVRMap,
const DenseSet<unsigned> &UsedByPhi) {
MachineInstr *NewMI = TII->duplicate(MI, MF);
for (unsigned i = 0, e = NewMI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = NewMI->getOperand(i);
if (!MO.isReg())
continue;
unsigned Reg = MO.getReg();
if (!TargetRegisterInfo::isVirtualRegister(Reg))
continue;
if (MO.isDef()) {
const TargetRegisterClass *RC = MRI->getRegClass(Reg);
unsigned NewReg = MRI->createVirtualRegister(RC);
MO.setReg(NewReg);
LocalVRMap.insert(std::make_pair(Reg, NewReg));
if (isDefLiveOut(Reg, TailBB, MRI) || UsedByPhi.count(Reg))
AddSSAUpdateEntry(Reg, NewReg, PredBB);
} else {
DenseMap<unsigned, unsigned>::iterator VI = LocalVRMap.find(Reg);
if (VI != LocalVRMap.end()) {
MO.setReg(VI->second);
// Clear any kill flags from this operand. The new register could have
// uses after this one, so kills are not valid here.
MO.setIsKill(false);
MRI->constrainRegClass(VI->second, MRI->getRegClass(Reg));
}
}
}
PredBB->insert(PredBB->instr_end(), NewMI);
}
