37#define DEBUG_TYPE "ssaupdater"
46 : InsertedPHIs(NewPHI) {}
58 ProtoName = std::string(
Name);
70 assert(ProtoType &&
"Need to initialize SSAUpdater");
71 assert(ProtoType == V->getType() &&
72 "All rewritten values must have the same type");
78 unsigned PHINumValues =
PHI->getNumIncomingValues();
79 if (PHINumValues != ValueMapping.
size())
83 for (
unsigned i = 0, e = PHINumValues; i != e; ++i)
84 if (ValueMapping[
PHI->getIncomingBlock(i)] !=
85 PHI->getIncomingValue(i)) {
93 Value *Res = GetValueAtEndOfBlockInternal(BB);
106 Value *SingularValue =
nullptr;
111 if (
PHINode *SomePhi = dyn_cast<PHINode>(BB->
begin())) {
112 for (
unsigned i = 0, e = SomePhi->getNumIncomingValues(); i != e; ++i) {
113 BasicBlock *PredBB = SomePhi->getIncomingBlock(i);
115 PredValues.
push_back(std::make_pair(PredBB, PredVal));
119 SingularValue = PredVal;
120 else if (PredVal != SingularValue)
121 SingularValue =
nullptr;
124 bool isFirstPred =
true;
127 PredValues.
push_back(std::make_pair(PredBB, PredVal));
131 SingularValue = PredVal;
133 }
else if (PredVal != SingularValue)
134 SingularValue =
nullptr;
139 if (PredValues.
empty())
144 return SingularValue;
148 if (isa<PHINode>(BB->
begin())) {
163 for (
const auto &PredValue : PredValues)
164 InsertedPHI->
addIncoming(PredValue.second, PredValue.first);
177 DL =
I->getDebugLoc();
181 if (InsertedPHIs) InsertedPHIs->push_back(InsertedPHI);
204 if (
DbgValue->getParent() ==
I->getParent())
208 for (
auto &DVR : DbgVariableRecords) {
209 if (DVR->getParent() ==
I->getParent())
211 UpdateDebugValue(
I, DVR);
224 for (
auto &DVR : DbgVariableRecords) {
225 UpdateDebugValue(
I, DVR);
233 DbgValue->replaceVariableLocationOp(
I, NewVal);
281 :
PHI(
P), idx(
PHI->getNumIncomingValues()) {}
284 bool operator==(
const PHI_iterator& x)
const {
return idx == x.idx; }
293 return PHI_iterator(
PHI,
true);
328 PHI->addIncoming(Val, Pred);
333 return dyn_cast<PHINode>(Val);
340 if (
PHI &&
PHI->getNumIncomingValues() == 0)
359 if (
Value *V = AvailableVals[BB])
363 return Impl.GetValue(BB);
373 if (Insts.
empty())
return;
375 const Value *SomeVal;
376 if (
const LoadInst *LI = dyn_cast<LoadInst>(Insts[0]))
379 SomeVal = cast<StoreInst>(Insts[0])->getOperand(0);
381 if (BaseName.
empty())
393 UsesByBlock[
User->getParent()].push_back(
User);
406 if (BlockUses.
empty())
continue;
410 if (BlockUses.
size() == 1) {
415 }
else if (
auto *AI = dyn_cast<AllocaInst>(
User)) {
427 bool HasStore =
false;
429 if (isa<StoreInst>(
I) || isa<AllocaInst>(
I)) {
450 Value *StoredValue =
nullptr;
452 if (
LoadInst *L = dyn_cast<LoadInst>(&
I)) {
460 L->replaceAllUsesWith(StoredValue);
461 ReplacedLoads[L] = StoredValue;
468 if (
StoreInst *SI = dyn_cast<StoreInst>(&
I)) {
474 StoredValue = SI->getOperand(0);
475 }
else if (
auto *AI = dyn_cast<AllocaInst>(&
I)) {
485 assert(StoredValue &&
"Already checked that there is a store in block");
492 for (
LoadInst *ALoad : LiveInLoads) {
498 ALoad->replaceAllUsesWith(NewVal);
499 ReplacedLoads[ALoad] = NewVal;
517 assert(NewVal &&
"not a replaced load?");
523 while (RLI != ReplacedLoads.
end()) {
524 NewVal = RLI->second;
525 RLI = ReplacedLoads.
find(NewVal);
533 User->eraseFromParent();
MachineBasicBlock MachineBasicBlock::iterator DebugLoc DL
This file contains the declarations for the subclasses of Constant, which represent the different fla...
This file defines the DenseMap class.
This file provides various utilities for inspecting and working with the control flow graph in LLVM I...
This defines the Use class.
static AvailableValsTy & getAvailableVals(void *AV)
DenseMap< MachineBasicBlock *, Register > AvailableValsTy
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
static AvailableValsTy & getAvailableVals(void *AV)
static bool IsEquivalentPHI(PHINode *PHI, SmallDenseMap< BasicBlock *, Value *, 8 > &ValueMapping)
This file defines the SmallVector class.
Class recording the (high level) value of a variable.
ArrayRef - Represent a constant reference to an array (0 or more elements consecutively in memory),...
bool empty() const
empty - Check if the array is empty.
LLVM Basic Block Representation.
iterator begin()
Instruction iterator methods.
iterator_range< const_phi_iterator > phis() const
Returns a range that iterates over the phis in the basic block.
const Instruction * getFirstNonPHI() const
Returns a pointer to the first instruction in this block that is not a PHINode instruction.
const DataLayout & getDataLayout() const
Get the data layout of the module this basic block belongs to.
const BasicBlock * getParent() const
This represents the llvm.dbg.value instruction.
Record of a variable value-assignment, aka a non instruction representation of the dbg....
void replaceVariableLocationOp(Value *OldValue, Value *NewValue, bool AllowEmpty=false)
ValueT lookup(const_arg_type_t< KeyT > Val) const
lookup - Return the entry for the specified key, or a default constructed value if no such entry exis...
iterator find(const_arg_type_t< KeyT > Val)
size_type count(const_arg_type_t< KeyT > Val) const
Return 1 if the specified key is in the map, 0 otherwise.
void insertBefore(Instruction *InsertPos)
Insert an unlinked instruction into a basic block immediately before the specified instruction.
InstListType::iterator eraseFromParent()
This method unlinks 'this' from the containing basic block and deletes it.
void setDebugLoc(DebugLoc Loc)
Set the debug location information for this instruction.
An instruction for reading from memory.
void addIncoming(Value *V, BasicBlock *BB)
Add an incoming value to the end of the PHI list.
static PHINode * Create(Type *Ty, unsigned NumReservedValues, const Twine &NameStr="", InsertPosition InsertBefore=nullptr)
Constructors - NumReservedValues is a hint for the number of incoming edges that this phi node will h...
static PoisonValue * get(Type *T)
Static factory methods - Return an 'poison' object of the specified type.
Value * getIncomingValue()
BasicBlock * getIncomingBlock()
PHI_iterator(PHINode *P, bool)
PHI_iterator & operator++()
bool operator!=(const PHI_iterator &x) const
bool operator==(const PHI_iterator &x) const
static BlkSucc_iterator BlkSucc_end(BlkT *BB)
static BlkSucc_iterator BlkSucc_begin(BlkT *BB)
static void FindPredecessorBlocks(BasicBlock *BB, SmallVectorImpl< BasicBlock * > *Preds)
FindPredecessorBlocks - Put the predecessors of Info->BB into the Preds vector, set Info->NumPreds,...
static Value * CreateEmptyPHI(BasicBlock *BB, unsigned NumPreds, SSAUpdater *Updater)
CreateEmptyPHI - Create a new PHI instruction in the specified block.
static PHINode * ValueIsNewPHI(Value *Val, SSAUpdater *Updater)
ValueIsNewPHI - Like ValueIsPHI but also check if the PHI has no source operands, i....
static PHI_iterator PHI_begin(PhiT *PHI)
static void AddPHIOperand(PHINode *PHI, Value *Val, BasicBlock *Pred)
AddPHIOperand - Add the specified value as an operand of the PHI for the specified predecessor block.
static Value * GetPHIValue(PHINode *PHI)
GetPHIValue - For the specified PHI instruction, return the value that it defines.
static Value * GetPoisonVal(BasicBlock *BB, SSAUpdater *Updater)
GetPoisonVal - Get a poison value of the same type as the value being handled.
static PHI_iterator PHI_end(PhiT *PHI)
static PHINode * ValueIsPHI(Value *Val, SSAUpdater *Updater)
ValueIsPHI - Check if a value is a PHI.
Helper class for SSA formation on a set of values defined in multiple blocks.
void RewriteUse(Use &U)
Rewrite a use of the symbolic value.
void RewriteUseAfterInsertions(Use &U)
Rewrite a use like RewriteUse but handling in-block definitions.
Value * FindValueForBlock(BasicBlock *BB) const
Return the value for the specified block if the SSAUpdater has one, otherwise return nullptr.
void Initialize(Type *Ty, StringRef Name)
Reset this object to get ready for a new set of SSA updates with type 'Ty'.
Value * GetValueInMiddleOfBlock(BasicBlock *BB)
Construct SSA form, materializing a value that is live in the middle of the specified block.
SSAUpdater(SmallVectorImpl< PHINode * > *InsertedPHIs=nullptr)
If InsertedPHIs is specified, it will be filled in with all PHI Nodes created by rewriting.
void UpdateDebugValues(Instruction *I)
Rewrite debug value intrinsics to conform to a new SSA form.
bool HasValueForBlock(BasicBlock *BB) const
Return true if the SSAUpdater already has a value for the specified block.
Value * GetValueAtEndOfBlock(BasicBlock *BB)
Construct SSA form, materializing a value that is live at the end of the specified block.
void AddAvailableValue(BasicBlock *BB, Value *V)
Indicate that a rewritten value is available in the specified block with the specified value.
This class consists of common code factored out of the SmallVector class to reduce code duplication b...
void push_back(const T &Elt)
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
An instruction for storing to memory.
StringRef - Represent a constant reference to a string, i.e.
constexpr bool empty() const
empty - Check if the string is empty.
TinyPtrVector - This class is specialized for cases where there are normally 0 or 1 element in a vect...
The instances of the Type class are immutable: once they are created, they are never changed.
A Use represents the edge between a Value definition and its users.
LLVM Value Representation.
Type * getType() const
All values are typed, get the type of this value.
void replaceAllUsesWith(Value *V)
Change all uses of this to point to a new Value.
StringRef getName() const
Return a constant reference to the value's name.
This is an optimization pass for GlobalISel generic memory operations.
void append_range(Container &C, Range &&R)
Wrapper function to append range R to container C.
void findDbgValues(SmallVectorImpl< DbgValueInst * > &DbgValues, Value *V, SmallVectorImpl< DbgVariableRecord * > *DbgVariableRecords=nullptr)
Finds the llvm.dbg.value intrinsics describing a value.
bool operator==(const AddressRangeValuePair &LHS, const AddressRangeValuePair &RHS)
Value * simplifyInstruction(Instruction *I, const SimplifyQuery &Q)
See if we can compute a simplified version of this instruction.
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
SuccIterator< Instruction, BasicBlock > succ_iterator
RNSuccIterator< NodeRef, BlockT, RegionT > succ_begin(NodeRef Node)
RNSuccIterator< NodeRef, BlockT, RegionT > succ_end(NodeRef Node)
auto predecessors(const MachineBasicBlock *BB)
bool is_contained(R &&Range, const E &Element)
Returns true if Element is found in Range.