///
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "sroa"
#include "llvm/Transforms/Scalar.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/AssumptionTracker.h"
#include "llvm/Analysis/Loads.h"
#include "llvm/Analysis/PtrUseVisitor.h"
#include "llvm/Analysis/ValueTracking.h"
-#include "llvm/DebugInfo.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
+#include "llvm/IR/InstVisitor.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Operator.h"
-#include "llvm/InstVisitor.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
using namespace llvm;
+#define DEBUG_TYPE "sroa"
+
STATISTIC(NumAllocasAnalyzed, "Number of allocas analyzed for replacement");
STATISTIC(NumAllocaPartitions, "Number of alloca partitions formed");
STATISTIC(MaxPartitionsPerAlloca, "Maximum number of partitions per alloca");
Use *getUse() const { return UseAndIsSplittable.getPointer(); }
- bool isDead() const { return getUse() == 0; }
- void kill() { UseAndIsSplittable.setPointer(0); }
+ bool isDead() const { return getUse() == nullptr; }
+ void kill() { UseAndIsSplittable.setPointer(nullptr); }
/// \brief Support for ordering ranges.
///
/// \brief Support for iterating over the slices.
/// @{
typedef SmallVectorImpl<Slice>::iterator iterator;
+ typedef iterator_range<iterator> range;
iterator begin() { return Slices.begin(); }
iterator end() { return Slices.end(); }
typedef SmallVectorImpl<Slice>::const_iterator const_iterator;
+ typedef iterator_range<const_iterator> const_range;
const_iterator begin() const { return Slices.begin(); }
const_iterator end() const { return Slices.end(); }
/// @}
- /// \brief Allow iterating the dead users for this alloca.
- ///
- /// These are instructions which will never actually use the alloca as they
- /// are outside the allocated range. They are safe to replace with undef and
- /// delete.
- /// @{
- typedef SmallVectorImpl<Instruction *>::const_iterator dead_user_iterator;
- dead_user_iterator dead_user_begin() const { return DeadUsers.begin(); }
- dead_user_iterator dead_user_end() const { return DeadUsers.end(); }
- /// @}
+ /// \brief Access the dead users for this alloca.
+ ArrayRef<Instruction *> getDeadUsers() const { return DeadUsers; }
- /// \brief Allow iterating the dead expressions referring to this alloca.
+ /// \brief Access the dead operands referring to this alloca.
///
/// These are operands which have cannot actually be used to refer to the
/// alloca as they are outside its range and the user doesn't correct for
/// that. These mostly consist of PHI node inputs and the like which we just
/// need to replace with undef.
- /// @{
- typedef SmallVectorImpl<Use *>::const_iterator dead_op_iterator;
- dead_op_iterator dead_op_begin() const { return DeadOperands.begin(); }
- dead_op_iterator dead_op_end() const { return DeadOperands.end(); }
- /// @}
+ ArrayRef<Use *> getDeadOperands() const { return DeadOperands; }
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
void print(raw_ostream &OS, const_iterator I, StringRef Indent = " ") const;
if (SI.getOperand(1) == SI.getOperand(2))
return SI.getOperand(1);
- return 0;
+ return nullptr;
+}
+
+/// \brief A helper that folds a PHI node or a select.
+static Value *foldPHINodeOrSelectInst(Instruction &I) {
+ if (PHINode *PN = dyn_cast<PHINode>(&I)) {
+ // If PN merges together the same value, return that value.
+ return PN->hasConstantValue();
+ }
+ return foldSelectInst(cast<SelectInst>(I));
}
/// \brief Builder for the alloca slices.
typedef PtrUseVisitor<SliceBuilder> Base;
const uint64_t AllocSize;
- AllocaSlices &S;
+ AllocaSlices &AS;
SmallDenseMap<Instruction *, unsigned> MemTransferSliceMap;
SmallDenseMap<Instruction *, uint64_t> PHIOrSelectSizes;
SmallPtrSet<Instruction *, 4> VisitedDeadInsts;
public:
- SliceBuilder(const DataLayout &DL, AllocaInst &AI, AllocaSlices &S)
+ SliceBuilder(const DataLayout &DL, AllocaInst &AI, AllocaSlices &AS)
: PtrUseVisitor<SliceBuilder>(DL),
- AllocSize(DL.getTypeAllocSize(AI.getAllocatedType())), S(S) {}
+ AllocSize(DL.getTypeAllocSize(AI.getAllocatedType())), AS(AS) {}
private:
void markAsDead(Instruction &I) {
- if (VisitedDeadInsts.insert(&I))
- S.DeadUsers.push_back(&I);
+ if (VisitedDeadInsts.insert(&I).second)
+ AS.DeadUsers.push_back(&I);
}
void insertUse(Instruction &I, const APInt &Offset, uint64_t Size,
DEBUG(dbgs() << "WARNING: Ignoring " << Size << " byte use @" << Offset
<< " which has zero size or starts outside of the "
<< AllocSize << " byte alloca:\n"
- << " alloca: " << S.AI << "\n"
+ << " alloca: " << AS.AI << "\n"
<< " use: " << I << "\n");
return markAsDead(I);
}
if (Size > AllocSize - BeginOffset) {
DEBUG(dbgs() << "WARNING: Clamping a " << Size << " byte use @" << Offset
<< " to remain within the " << AllocSize << " byte alloca:\n"
- << " alloca: " << S.AI << "\n"
+ << " alloca: " << AS.AI << "\n"
<< " use: " << I << "\n");
EndOffset = AllocSize;
}
- S.Slices.push_back(Slice(BeginOffset, EndOffset, U, IsSplittable));
+ AS.Slices.push_back(Slice(BeginOffset, EndOffset, U, IsSplittable));
}
void visitBitCastInst(BitCastInst &BC) {
DEBUG(dbgs() << "WARNING: Ignoring " << Size << " byte store @" << Offset
<< " which extends past the end of the " << AllocSize
<< " byte alloca:\n"
- << " alloca: " << S.AI << "\n"
+ << " alloca: " << AS.AI << "\n"
<< " use: " << SI << "\n");
return markAsDead(SI);
}
if (Offset.uge(AllocSize)) {
SmallDenseMap<Instruction *, unsigned>::iterator MTPI = MemTransferSliceMap.find(&II);
if (MTPI != MemTransferSliceMap.end())
- S.Slices[MTPI->second].kill();
+ AS.Slices[MTPI->second].kill();
return markAsDead(II);
}
bool Inserted;
SmallDenseMap<Instruction *, unsigned>::iterator MTPI;
std::tie(MTPI, Inserted) =
- MemTransferSliceMap.insert(std::make_pair(&II, S.Slices.size()));
+ MemTransferSliceMap.insert(std::make_pair(&II, AS.Slices.size()));
unsigned PrevIdx = MTPI->second;
if (!Inserted) {
- Slice &PrevP = S.Slices[PrevIdx];
+ Slice &PrevP = AS.Slices[PrevIdx];
// Check if the begin offsets match and this is a non-volatile transfer.
// In that case, we can completely elide the transfer.
insertUse(II, Offset, Size, /*IsSplittable=*/Inserted && Length);
// Check that we ended up with a valid index in the map.
- assert(S.Slices[PrevIdx].getUse()->getUser() == &II &&
+ assert(AS.Slices[PrevIdx].getUse()->getUser() == &II &&
"Map index doesn't point back to a slice with this user.");
}
return I;
}
- for (Value::use_iterator UI = I->use_begin(), UE = I->use_end(); UI != UE;
- ++UI)
- if (Visited.insert(cast<Instruction>(*UI)))
- Uses.push_back(std::make_pair(I, cast<Instruction>(*UI)));
+ for (User *U : I->users())
+ if (Visited.insert(cast<Instruction>(U)).second)
+ Uses.push_back(std::make_pair(I, cast<Instruction>(U)));
} while (!Uses.empty());
- return 0;
+ return nullptr;
}
- void visitPHINode(PHINode &PN) {
- if (PN.use_empty())
- return markAsDead(PN);
- if (!IsOffsetKnown)
- return PI.setAborted(&PN);
-
- // See if we already have computed info on this node.
- uint64_t &PHISize = PHIOrSelectSizes[&PN];
- if (!PHISize) {
- // This is a new PHI node, check for an unsafe use of the PHI node.
- if (Instruction *UnsafeI = hasUnsafePHIOrSelectUse(&PN, PHISize))
- return PI.setAborted(UnsafeI);
- }
-
- // For PHI and select operands outside the alloca, we can't nuke the entire
- // phi or select -- the other side might still be relevant, so we special
- // case them here and use a separate structure to track the operands
- // themselves which should be replaced with undef.
- // FIXME: This should instead be escaped in the event we're instrumenting
- // for address sanitization.
- if (Offset.uge(AllocSize)) {
- S.DeadOperands.push_back(U);
- return;
- }
-
- insertUse(PN, Offset, PHISize);
- }
+ void visitPHINodeOrSelectInst(Instruction &I) {
+ assert(isa<PHINode>(I) || isa<SelectInst>(I));
+ if (I.use_empty())
+ return markAsDead(I);
- void visitSelectInst(SelectInst &SI) {
- if (SI.use_empty())
- return markAsDead(SI);
- if (Value *Result = foldSelectInst(SI)) {
+ // TODO: We could use SimplifyInstruction here to fold PHINodes and
+ // SelectInsts. However, doing so requires to change the current
+ // dead-operand-tracking mechanism. For instance, suppose neither loading
+ // from %U nor %other traps. Then "load (select undef, %U, %other)" does not
+ // trap either. However, if we simply replace %U with undef using the
+ // current dead-operand-tracking mechanism, "load (select undef, undef,
+ // %other)" may trap because the select may return the first operand
+ // "undef".
+ if (Value *Result = foldPHINodeOrSelectInst(I)) {
if (Result == *U)
// If the result of the constant fold will be the pointer, recurse
- // through the select as if we had RAUW'ed it.
- enqueueUsers(SI);
+ // through the PHI/select as if we had RAUW'ed it.
+ enqueueUsers(I);
else
- // Otherwise the operand to the select is dead, and we can replace it
- // with undef.
- S.DeadOperands.push_back(U);
+ // Otherwise the operand to the PHI/select is dead, and we can replace
+ // it with undef.
+ AS.DeadOperands.push_back(U);
return;
}
+
if (!IsOffsetKnown)
- return PI.setAborted(&SI);
+ return PI.setAborted(&I);
// See if we already have computed info on this node.
- uint64_t &SelectSize = PHIOrSelectSizes[&SI];
- if (!SelectSize) {
- // This is a new Select, check for an unsafe use of it.
- if (Instruction *UnsafeI = hasUnsafePHIOrSelectUse(&SI, SelectSize))
+ uint64_t &Size = PHIOrSelectSizes[&I];
+ if (!Size) {
+ // This is a new PHI/Select, check for an unsafe use of it.
+ if (Instruction *UnsafeI = hasUnsafePHIOrSelectUse(&I, Size))
return PI.setAborted(UnsafeI);
}
// FIXME: This should instead be escaped in the event we're instrumenting
// for address sanitization.
if (Offset.uge(AllocSize)) {
- S.DeadOperands.push_back(U);
+ AS.DeadOperands.push_back(U);
return;
}
- insertUse(SI, Offset, SelectSize);
+ insertUse(I, Offset, Size);
+ }
+
+ void visitPHINode(PHINode &PN) {
+ visitPHINodeOrSelectInst(PN);
+ }
+
+ void visitSelectInst(SelectInst &SI) {
+ visitPHINodeOrSelectInst(SI);
}
/// \brief Disable SROA entirely if there are unhandled users of the alloca.
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
AI(AI),
#endif
- PointerEscapingInstr(0) {
+ PointerEscapingInstr(nullptr) {
SliceBuilder PB(DL, AI, *this);
SliceBuilder::PtrInfo PtrI = PB.visitPtr(AI);
if (PtrI.isEscaped() || PtrI.isAborted()) {
void run(const SmallVectorImpl<Instruction*> &Insts) {
// Retain the debug information attached to the alloca for use when
// rewriting loads and stores.
- if (MDNode *DebugNode = MDNode::getIfExists(AI.getContext(), &AI)) {
- for (Value::use_iterator UI = DebugNode->use_begin(),
- UE = DebugNode->use_end();
- UI != UE; ++UI)
- if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(*UI))
- DDIs.push_back(DDI);
- else if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(*UI))
- DVIs.push_back(DVI);
+ if (auto *L = LocalAsMetadata::getIfExists(&AI)) {
+ if (auto *DebugNode = MetadataAsValue::getIfExists(AI.getContext(), L)) {
+ for (User *U : DebugNode->users())
+ if (DbgDeclareInst *DDI = dyn_cast<DbgDeclareInst>(U))
+ DDIs.push_back(DDI);
+ else if (DbgValueInst *DVI = dyn_cast<DbgValueInst>(U))
+ DVIs.push_back(DVI);
+ }
}
LoadAndStorePromoter::run(Insts);
else
return false;
- } while (Visited.insert(Ptr));
+ } while (Visited.insert(Ptr).second);
return false;
}
void updateDebugInfo(Instruction *Inst) const override {
- for (SmallVectorImpl<DbgDeclareInst *>::const_iterator I = DDIs.begin(),
- E = DDIs.end(); I != E; ++I) {
- DbgDeclareInst *DDI = *I;
+ for (DbgDeclareInst *DDI : DDIs)
if (StoreInst *SI = dyn_cast<StoreInst>(Inst))
ConvertDebugDeclareToDebugValue(DDI, SI, DIB);
else if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
ConvertDebugDeclareToDebugValue(DDI, LI, DIB);
- }
- for (SmallVectorImpl<DbgValueInst *>::const_iterator I = DVIs.begin(),
- E = DVIs.end(); I != E; ++I) {
- DbgValueInst *DVI = *I;
- Value *Arg = 0;
+ for (DbgValueInst *DVI : DVIs) {
+ Value *Arg = nullptr;
if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
// If an argument is zero extended then use argument directly. The ZExt
// may be zapped by an optimization pass in future.
continue;
}
Instruction *DbgVal =
- DIB.insertDbgValueIntrinsic(Arg, 0, DIVariable(DVI->getVariable()),
- Inst);
+ DIB.insertDbgValueIntrinsic(Arg, 0, DIVariable(DVI->getVariable()),
+ DIExpression(DVI->getExpression()), Inst);
DbgVal->setDebugLoc(DVI->getDebugLoc());
}
}
LLVMContext *C;
const DataLayout *DL;
DominatorTree *DT;
+ AssumptionTracker *AT;
/// \brief Worklist of alloca instructions to simplify.
///
public:
SROA(bool RequiresDomTree = true)
: FunctionPass(ID), RequiresDomTree(RequiresDomTree),
- C(0), DL(0), DT(0) {
+ C(nullptr), DL(nullptr), DT(nullptr) {
initializeSROAPass(*PassRegistry::getPassRegistry());
}
bool runOnFunction(Function &F) override;
friend class PHIOrSelectSpeculator;
friend class AllocaSliceRewriter;
- bool rewritePartition(AllocaInst &AI, AllocaSlices &S,
+ bool rewritePartition(AllocaInst &AI, AllocaSlices &AS,
AllocaSlices::iterator B, AllocaSlices::iterator E,
int64_t BeginOffset, int64_t EndOffset,
ArrayRef<AllocaSlices::iterator> SplitUses);
- bool splitAlloca(AllocaInst &AI, AllocaSlices &S);
+ bool splitAlloca(AllocaInst &AI, AllocaSlices &AS);
bool runOnAlloca(AllocaInst &AI);
void clobberUse(Use &U);
- void deleteDeadInstructions(SmallPtrSet<AllocaInst *, 4> &DeletedAllocas);
+ void deleteDeadInstructions(SmallPtrSetImpl<AllocaInst *> &DeletedAllocas);
bool promoteAllocas(Function &F);
};
}
INITIALIZE_PASS_BEGIN(SROA, "sroa", "Scalar Replacement Of Aggregates",
false, false)
+INITIALIZE_PASS_DEPENDENCY(AssumptionTracker)
INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
INITIALIZE_PASS_END(SROA, "sroa", "Scalar Replacement Of Aggregates",
false, false)
static Type *findCommonType(AllocaSlices::const_iterator B,
AllocaSlices::const_iterator E,
uint64_t EndOffset) {
- Type *Ty = 0;
+ Type *Ty = nullptr;
bool TyIsCommon = true;
- IntegerType *ITy = 0;
+ IntegerType *ITy = nullptr;
// Note that we need to look at *every* alloca slice's Use to ensure we
// always get consistent results regardless of the order of slices.
if (I->beginOffset() != B->beginOffset() || I->endOffset() != EndOffset)
continue;
- Type *UserTy = 0;
+ Type *UserTy = nullptr;
if (LoadInst *LI = dyn_cast<LoadInst>(U->getUser())) {
UserTy = LI->getType();
} else if (StoreInst *SI = dyn_cast<StoreInst>(U->getUser())) {
UserTy = SI->getValueOperand()->getType();
}
- if (!UserTy || (Ty && Ty != UserTy))
- TyIsCommon = false; // Give up on anything but an iN type.
- else
- Ty = UserTy;
-
if (IntegerType *UserITy = dyn_cast_or_null<IntegerType>(UserTy)) {
// If the type is larger than the partition, skip it. We only encounter
// this for split integer operations where we want to use the type of the
if (!ITy || ITy->getBitWidth() < UserITy->getBitWidth())
ITy = UserITy;
}
+
+ // To avoid depending on the order of slices, Ty and TyIsCommon must not
+ // depend on types skipped above.
+ if (!UserTy || (Ty && Ty != UserTy))
+ TyIsCommon = false; // Give up on anything but an iN type.
+ else
+ Ty = UserTy;
}
return TyIsCommon ? Ty : ITy;
/// FIXME: This should be hoisted into a generic utility, likely in
/// Transforms/Util/Local.h
static bool isSafePHIToSpeculate(PHINode &PN,
- const DataLayout *DL = 0) {
+ const DataLayout *DL = nullptr) {
// For now, we can only do this promotion if the load is in the same block
// as the PHI, and if there are no stores between the phi and load.
// TODO: Allow recursive phi users.
BasicBlock *BB = PN.getParent();
unsigned MaxAlign = 0;
bool HaveLoad = false;
- for (Value::use_iterator UI = PN.use_begin(), UE = PN.use_end(); UI != UE;
- ++UI) {
- LoadInst *LI = dyn_cast<LoadInst>(*UI);
- if (LI == 0 || !LI->isSimple())
+ for (User *U : PN.users()) {
+ LoadInst *LI = dyn_cast<LoadInst>(U);
+ if (!LI || !LI->isSimple())
return false;
// For now we only allow loads in the same block as the PHI. This is
// If this pointer is always safe to load, or if we can prove that there
// is already a load in the block, then we can move the load to the pred
// block.
- if (InVal->isDereferenceablePointer() ||
+ if (InVal->isDereferenceablePointer(DL) ||
isSafeToLoadUnconditionally(InVal, TI, MaxAlign, DL))
continue;
PHINode *NewPN = PHIBuilder.CreatePHI(LoadTy, PN.getNumIncomingValues(),
PN.getName() + ".sroa.speculated");
- // Get the TBAA tag and alignment to use from one of the loads. It doesn't
+ // Get the AA tags and alignment to use from one of the loads. It doesn't
// matter which one we get and if any differ.
- LoadInst *SomeLoad = cast<LoadInst>(*PN.use_begin());
- MDNode *TBAATag = SomeLoad->getMetadata(LLVMContext::MD_tbaa);
+ LoadInst *SomeLoad = cast<LoadInst>(PN.user_back());
+
+ AAMDNodes AATags;
+ SomeLoad->getAAMetadata(AATags);
unsigned Align = SomeLoad->getAlignment();
// Rewrite all loads of the PN to use the new PHI.
while (!PN.use_empty()) {
- LoadInst *LI = cast<LoadInst>(*PN.use_begin());
+ LoadInst *LI = cast<LoadInst>(PN.user_back());
LI->replaceAllUsesWith(NewPN);
LI->eraseFromParent();
}
InVal, (PN.getName() + ".sroa.speculate.load." + Pred->getName()));
++NumLoadsSpeculated;
Load->setAlignment(Align);
- if (TBAATag)
- Load->setMetadata(LLVMContext::MD_tbaa, TBAATag);
+ if (AATags)
+ Load->setAAMetadata(AATags);
NewPN->addIncoming(Load, Pred);
}
///
/// We can do this to a select if its only uses are loads and if the operand
/// to the select can be loaded unconditionally.
-static bool isSafeSelectToSpeculate(SelectInst &SI, const DataLayout *DL = 0) {
+static bool isSafeSelectToSpeculate(SelectInst &SI,
+ const DataLayout *DL = nullptr) {
Value *TValue = SI.getTrueValue();
Value *FValue = SI.getFalseValue();
- bool TDerefable = TValue->isDereferenceablePointer();
- bool FDerefable = FValue->isDereferenceablePointer();
+ bool TDerefable = TValue->isDereferenceablePointer(DL);
+ bool FDerefable = FValue->isDereferenceablePointer(DL);
- for (Value::use_iterator UI = SI.use_begin(), UE = SI.use_end(); UI != UE;
- ++UI) {
- LoadInst *LI = dyn_cast<LoadInst>(*UI);
- if (LI == 0 || !LI->isSimple())
+ for (User *U : SI.users()) {
+ LoadInst *LI = dyn_cast<LoadInst>(U);
+ if (!LI || !LI->isSimple())
return false;
// Both operands to the select need to be dereferencable, either
Value *FV = SI.getFalseValue();
// Replace the loads of the select with a select of two loads.
while (!SI.use_empty()) {
- LoadInst *LI = cast<LoadInst>(*SI.use_begin());
+ LoadInst *LI = cast<LoadInst>(SI.user_back());
assert(LI->isSimple() && "We only speculate simple loads");
IRB.SetInsertPoint(LI);
IRB.CreateLoad(FV, LI->getName() + ".sroa.speculate.load.false");
NumLoadsSpeculated += 2;
- // Transfer alignment and TBAA info if present.
+ // Transfer alignment and AA info if present.
TL->setAlignment(LI->getAlignment());
FL->setAlignment(LI->getAlignment());
- if (MDNode *Tag = LI->getMetadata(LLVMContext::MD_tbaa)) {
- TL->setMetadata(LLVMContext::MD_tbaa, Tag);
- FL->setMetadata(LLVMContext::MD_tbaa, Tag);
+
+ AAMDNodes Tags;
+ LI->getAAMetadata(Tags);
+ if (Tags) {
+ TL->setAAMetadata(Tags);
+ FL->setAAMetadata(Tags);
}
Value *V = IRB.CreateSelect(SI.getCondition(), TL, FL,
// We can't recurse through pointer types.
if (Ty->isPointerTy())
- return 0;
+ return nullptr;
// We try to analyze GEPs over vectors here, but note that these GEPs are
// extremely poorly defined currently. The long-term goal is to remove GEPing
// over a vector from the IR completely.
if (VectorType *VecTy = dyn_cast<VectorType>(Ty)) {
unsigned ElementSizeInBits = DL.getTypeSizeInBits(VecTy->getScalarType());
- if (ElementSizeInBits % 8)
- return 0; // GEPs over non-multiple of 8 size vector elements are invalid.
+ if (ElementSizeInBits % 8 != 0) {
+ // GEPs over non-multiple of 8 size vector elements are invalid.
+ return nullptr;
+ }
APInt ElementSize(Offset.getBitWidth(), ElementSizeInBits / 8);
APInt NumSkippedElements = Offset.sdiv(ElementSize);
if (NumSkippedElements.ugt(VecTy->getNumElements()))
- return 0;
+ return nullptr;
Offset -= NumSkippedElements * ElementSize;
Indices.push_back(IRB.getInt(NumSkippedElements));
return getNaturalGEPRecursively(IRB, DL, Ptr, VecTy->getElementType(),
APInt ElementSize(Offset.getBitWidth(), DL.getTypeAllocSize(ElementTy));
APInt NumSkippedElements = Offset.sdiv(ElementSize);
if (NumSkippedElements.ugt(ArrTy->getNumElements()))
- return 0;
+ return nullptr;
Offset -= NumSkippedElements * ElementSize;
Indices.push_back(IRB.getInt(NumSkippedElements));
StructType *STy = dyn_cast<StructType>(Ty);
if (!STy)
- return 0;
+ return nullptr;
const StructLayout *SL = DL.getStructLayout(STy);
uint64_t StructOffset = Offset.getZExtValue();
if (StructOffset >= SL->getSizeInBytes())
- return 0;
+ return nullptr;
unsigned Index = SL->getElementContainingOffset(StructOffset);
Offset -= APInt(Offset.getBitWidth(), SL->getElementOffset(Index));
Type *ElementTy = STy->getElementType(Index);
if (Offset.uge(DL.getTypeAllocSize(ElementTy)))
- return 0; // The offset points into alignment padding.
+ return nullptr; // The offset points into alignment padding.
Indices.push_back(IRB.getInt32(Index));
return getNaturalGEPRecursively(IRB, DL, Ptr, ElementTy, Offset, TargetTy,
// Don't consider any GEPs through an i8* as natural unless the TargetTy is
// an i8.
if (Ty == IRB.getInt8PtrTy(Ty->getAddressSpace()) && TargetTy->isIntegerTy(8))
- return 0;
+ return nullptr;
Type *ElementTy = Ty->getElementType();
if (!ElementTy->isSized())
- return 0; // We can't GEP through an unsized element.
+ return nullptr; // We can't GEP through an unsized element.
APInt ElementSize(Offset.getBitWidth(), DL.getTypeAllocSize(ElementTy));
if (ElementSize == 0)
- return 0; // Zero-length arrays can't help us build a natural GEP.
+ return nullptr; // Zero-length arrays can't help us build a natural GEP.
APInt NumSkippedElements = Offset.sdiv(ElementSize);
Offset -= NumSkippedElements * ElementSize;
// We may end up computing an offset pointer that has the wrong type. If we
// never are able to compute one directly that has the correct type, we'll
// fall back to it, so keep it around here.
- Value *OffsetPtr = 0;
+ Value *OffsetPtr = nullptr;
// Remember any i8 pointer we come across to re-use if we need to do a raw
// byte offset.
- Value *Int8Ptr = 0;
+ Value *Int8Ptr = nullptr;
APInt Int8PtrOffset(Offset.getBitWidth(), 0);
Type *TargetTy = PointerTy->getPointerElementType();
break;
Offset += GEPOffset;
Ptr = GEP->getPointerOperand();
- if (!Visited.insert(Ptr))
+ if (!Visited.insert(Ptr).second)
break;
}
break;
}
assert(Ptr->getType()->isPointerTy() && "Unexpected operand type!");
- } while (Visited.insert(Ptr));
+ } while (Visited.insert(Ptr).second);
if (!OffsetPtr) {
if (!Int8Ptr) {
///
/// This function is called to test each entry in a partioning which is slated
/// for a single slice.
-static bool isVectorPromotionViableForSlice(
- const DataLayout &DL, AllocaSlices &S, uint64_t SliceBeginOffset,
- uint64_t SliceEndOffset, VectorType *Ty, uint64_t ElementSize,
- AllocaSlices::const_iterator I) {
+static bool
+isVectorPromotionViableForSlice(const DataLayout &DL, uint64_t SliceBeginOffset,
+ uint64_t SliceEndOffset, VectorType *Ty,
+ uint64_t ElementSize, const Slice &S) {
// First validate the slice offsets.
uint64_t BeginOffset =
- std::max(I->beginOffset(), SliceBeginOffset) - SliceBeginOffset;
+ std::max(S.beginOffset(), SliceBeginOffset) - SliceBeginOffset;
uint64_t BeginIndex = BeginOffset / ElementSize;
if (BeginIndex * ElementSize != BeginOffset ||
BeginIndex >= Ty->getNumElements())
return false;
uint64_t EndOffset =
- std::min(I->endOffset(), SliceEndOffset) - SliceBeginOffset;
+ std::min(S.endOffset(), SliceEndOffset) - SliceBeginOffset;
uint64_t EndIndex = EndOffset / ElementSize;
if (EndIndex * ElementSize != EndOffset || EndIndex > Ty->getNumElements())
return false;
assert(EndIndex > BeginIndex && "Empty vector!");
uint64_t NumElements = EndIndex - BeginIndex;
- Type *SliceTy =
- (NumElements == 1) ? Ty->getElementType()
- : VectorType::get(Ty->getElementType(), NumElements);
+ Type *SliceTy = (NumElements == 1)
+ ? Ty->getElementType()
+ : VectorType::get(Ty->getElementType(), NumElements);
Type *SplitIntTy =
Type::getIntNTy(Ty->getContext(), NumElements * ElementSize * 8);
- Use *U = I->getUse();
+ Use *U = S.getUse();
if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(U->getUser())) {
if (MI->isVolatile())
return false;
- if (!I->isSplittable())
+ if (!S.isSplittable())
return false; // Skip any unsplittable intrinsics.
+ } else if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(U->getUser())) {
+ if (II->getIntrinsicID() != Intrinsic::lifetime_start &&
+ II->getIntrinsicID() != Intrinsic::lifetime_end)
+ return false;
} else if (U->get()->getType()->getPointerElementType()->isStructTy()) {
// Disable vector promotion when there are loads or stores of an FCA.
return false;
if (LI->isVolatile())
return false;
Type *LTy = LI->getType();
- if (SliceBeginOffset > I->beginOffset() ||
- SliceEndOffset < I->endOffset()) {
+ if (SliceBeginOffset > S.beginOffset() || SliceEndOffset < S.endOffset()) {
assert(LTy->isIntegerTy());
LTy = SplitIntTy;
}
if (SI->isVolatile())
return false;
Type *STy = SI->getValueOperand()->getType();
- if (SliceBeginOffset > I->beginOffset() ||
- SliceEndOffset < I->endOffset()) {
+ if (SliceBeginOffset > S.beginOffset() || SliceEndOffset < S.endOffset()) {
assert(STy->isIntegerTy());
STy = SplitIntTy;
}
/// SSA value. We only can ensure this for a limited set of operations, and we
/// don't want to do the rewrites unless we are confident that the result will
/// be promotable, so we have an early test here.
-static bool
-isVectorPromotionViable(const DataLayout &DL, Type *AllocaTy, AllocaSlices &S,
+static VectorType *
+isVectorPromotionViable(const DataLayout &DL,
uint64_t SliceBeginOffset, uint64_t SliceEndOffset,
- AllocaSlices::const_iterator I,
- AllocaSlices::const_iterator E,
+ AllocaSlices::const_range Slices,
ArrayRef<AllocaSlices::iterator> SplitUses) {
- VectorType *Ty = dyn_cast<VectorType>(AllocaTy);
- if (!Ty)
- return false;
-
- uint64_t ElementSize = DL.getTypeSizeInBits(Ty->getScalarType());
+ // Collect the candidate types for vector-based promotion. Also track whether
+ // we have different element types.
+ SmallVector<VectorType *, 4> CandidateTys;
+ Type *CommonEltTy = nullptr;
+ bool HaveCommonEltTy = true;
+ auto CheckCandidateType = [&](Type *Ty) {
+ if (auto *VTy = dyn_cast<VectorType>(Ty)) {
+ CandidateTys.push_back(VTy);
+ if (!CommonEltTy)
+ CommonEltTy = VTy->getElementType();
+ else if (CommonEltTy != VTy->getElementType())
+ HaveCommonEltTy = false;
+ }
+ };
+ // Consider any loads or stores that are the exact size of the slice.
+ for (const auto &S : Slices)
+ if (S.beginOffset() == SliceBeginOffset &&
+ S.endOffset() == SliceEndOffset) {
+ if (auto *LI = dyn_cast<LoadInst>(S.getUse()->getUser()))
+ CheckCandidateType(LI->getType());
+ else if (auto *SI = dyn_cast<StoreInst>(S.getUse()->getUser()))
+ CheckCandidateType(SI->getValueOperand()->getType());
+ }
+
+ // If we didn't find a vector type, nothing to do here.
+ if (CandidateTys.empty())
+ return nullptr;
+
+ // Remove non-integer vector types if we had multiple common element types.
+ // FIXME: It'd be nice to replace them with integer vector types, but we can't
+ // do that until all the backends are known to produce good code for all
+ // integer vector types.
+ if (!HaveCommonEltTy) {
+ CandidateTys.erase(std::remove_if(CandidateTys.begin(), CandidateTys.end(),
+ [](VectorType *VTy) {
+ return !VTy->getElementType()->isIntegerTy();
+ }),
+ CandidateTys.end());
+
+ // If there were no integer vector types, give up.
+ if (CandidateTys.empty())
+ return nullptr;
+
+ // Rank the remaining candidate vector types. This is easy because we know
+ // they're all integer vectors. We sort by ascending number of elements.
+ auto RankVectorTypes = [&DL](VectorType *RHSTy, VectorType *LHSTy) {
+ assert(DL.getTypeSizeInBits(RHSTy) == DL.getTypeSizeInBits(LHSTy) &&
+ "Cannot have vector types of different sizes!");
+ assert(RHSTy->getElementType()->isIntegerTy() &&
+ "All non-integer types eliminated!");
+ assert(LHSTy->getElementType()->isIntegerTy() &&
+ "All non-integer types eliminated!");
+ return RHSTy->getNumElements() < LHSTy->getNumElements();
+ };
+ std::sort(CandidateTys.begin(), CandidateTys.end(), RankVectorTypes);
+ CandidateTys.erase(
+ std::unique(CandidateTys.begin(), CandidateTys.end(), RankVectorTypes),
+ CandidateTys.end());
+ } else {
+// The only way to have the same element type in every vector type is to
+// have the same vector type. Check that and remove all but one.
+#ifndef NDEBUG
+ for (VectorType *VTy : CandidateTys) {
+ assert(VTy->getElementType() == CommonEltTy &&
+ "Unaccounted for element type!");
+ assert(VTy == CandidateTys[0] &&
+ "Different vector types with the same element type!");
+ }
+#endif
+ CandidateTys.resize(1);
+ }
- // While the definition of LLVM vectors is bitpacked, we don't support sizes
- // that aren't byte sized.
- if (ElementSize % 8)
- return false;
- assert((DL.getTypeSizeInBits(Ty) % 8) == 0 &&
- "vector size not a multiple of element size?");
- ElementSize /= 8;
+ // Try each vector type, and return the one which works.
+ auto CheckVectorTypeForPromotion = [&](VectorType *VTy) {
+ uint64_t ElementSize = DL.getTypeSizeInBits(VTy->getElementType());
- for (; I != E; ++I)
- if (!isVectorPromotionViableForSlice(DL, S, SliceBeginOffset,
- SliceEndOffset, Ty, ElementSize, I))
+ // While the definition of LLVM vectors is bitpacked, we don't support sizes
+ // that aren't byte sized.
+ if (ElementSize % 8)
return false;
+ assert((DL.getTypeSizeInBits(VTy) % 8) == 0 &&
+ "vector size not a multiple of element size?");
+ ElementSize /= 8;
- for (ArrayRef<AllocaSlices::iterator>::const_iterator SUI = SplitUses.begin(),
- SUE = SplitUses.end();
- SUI != SUE; ++SUI)
- if (!isVectorPromotionViableForSlice(DL, S, SliceBeginOffset,
- SliceEndOffset, Ty, ElementSize, *SUI))
- return false;
+ for (const auto &S : Slices)
+ if (!isVectorPromotionViableForSlice(DL, SliceBeginOffset, SliceEndOffset,
+ VTy, ElementSize, S))
+ return false;
- return true;
+ for (const auto &SI : SplitUses)
+ if (!isVectorPromotionViableForSlice(DL, SliceBeginOffset, SliceEndOffset,
+ VTy, ElementSize, *SI))
+ return false;
+
+ return true;
+ };
+ for (VectorType *VTy : CandidateTys)
+ if (CheckVectorTypeForPromotion(VTy))
+ return VTy;
+
+ return nullptr;
}
/// \brief Test whether a slice of an alloca is valid for integer widening.
static bool isIntegerWideningViableForSlice(const DataLayout &DL,
Type *AllocaTy,
uint64_t AllocBeginOffset,
- uint64_t Size, AllocaSlices &S,
- AllocaSlices::const_iterator I,
+ uint64_t Size,
+ const Slice &S,
bool &WholeAllocaOp) {
- uint64_t RelBegin = I->beginOffset() - AllocBeginOffset;
- uint64_t RelEnd = I->endOffset() - AllocBeginOffset;
+ uint64_t RelBegin = S.beginOffset() - AllocBeginOffset;
+ uint64_t RelEnd = S.endOffset() - AllocBeginOffset;
// We can't reasonably handle cases where the load or store extends past
// the end of the aloca's type and into its padding.
if (RelEnd > Size)
return false;
- Use *U = I->getUse();
+ Use *U = S.getUse();
if (LoadInst *LI = dyn_cast<LoadInst>(U->getUser())) {
if (LI->isVolatile())
return false;
- if (RelBegin == 0 && RelEnd == Size)
+ // Note that we don't count vector loads or stores as whole-alloca
+ // operations which enable integer widening because we would prefer to use
+ // vector widening instead.
+ if (!isa<VectorType>(LI->getType()) && RelBegin == 0 && RelEnd == Size)
WholeAllocaOp = true;
if (IntegerType *ITy = dyn_cast<IntegerType>(LI->getType())) {
if (ITy->getBitWidth() < DL.getTypeStoreSizeInBits(ITy))
Type *ValueTy = SI->getValueOperand()->getType();
if (SI->isVolatile())
return false;
- if (RelBegin == 0 && RelEnd == Size)
+ // Note that we don't count vector loads or stores as whole-alloca
+ // operations which enable integer widening because we would prefer to use
+ // vector widening instead.
+ if (!isa<VectorType>(ValueTy) && RelBegin == 0 && RelEnd == Size)
WholeAllocaOp = true;
if (IntegerType *ITy = dyn_cast<IntegerType>(ValueTy)) {
if (ITy->getBitWidth() < DL.getTypeStoreSizeInBits(ITy))
} else if (MemIntrinsic *MI = dyn_cast<MemIntrinsic>(U->getUser())) {
if (MI->isVolatile() || !isa<Constant>(MI->getLength()))
return false;
- if (!I->isSplittable())
+ if (!S.isSplittable())
return false; // Skip any unsplittable intrinsics.
} else if (IntrinsicInst *II = dyn_cast<IntrinsicInst>(U->getUser())) {
if (II->getIntrinsicID() != Intrinsic::lifetime_start &&
/// promote the resulting alloca.
static bool
isIntegerWideningViable(const DataLayout &DL, Type *AllocaTy,
- uint64_t AllocBeginOffset, AllocaSlices &S,
- AllocaSlices::const_iterator I,
- AllocaSlices::const_iterator E,
+ uint64_t AllocBeginOffset,
+ AllocaSlices::const_range Slices,
ArrayRef<AllocaSlices::iterator> SplitUses) {
uint64_t SizeInBits = DL.getTypeSizeInBits(AllocaTy);
// Don't create integer types larger than the maximum bitwidth.
// promote due to some other unsplittable entry (which we may make splittable
// later). However, if there are only splittable uses, go ahead and assume
// that we cover the alloca.
- bool WholeAllocaOp = (I != E) ? false : DL.isLegalInteger(SizeInBits);
+ bool WholeAllocaOp =
+ Slices.begin() != Slices.end() ? false : DL.isLegalInteger(SizeInBits);
- for (; I != E; ++I)
+ for (const auto &S : Slices)
if (!isIntegerWideningViableForSlice(DL, AllocaTy, AllocBeginOffset, Size,
- S, I, WholeAllocaOp))
+ S, WholeAllocaOp))
return false;
- for (ArrayRef<AllocaSlices::iterator>::const_iterator SUI = SplitUses.begin(),
- SUE = SplitUses.end();
- SUI != SUE; ++SUI)
+ for (const auto &SI : SplitUses)
if (!isIntegerWideningViableForSlice(DL, AllocaTy, AllocBeginOffset, Size,
- S, *SUI, WholeAllocaOp))
+ *SI, WholeAllocaOp))
return false;
return WholeAllocaOp;
typedef llvm::InstVisitor<AllocaSliceRewriter, bool> Base;
const DataLayout &DL;
- AllocaSlices &S;
+ AllocaSlices &AS;
SROA &Pass;
AllocaInst &OldAI, &NewAI;
const uint64_t NewAllocaBeginOffset, NewAllocaEndOffset;
Type *NewAllocaTy;
+ // This is a convenience and flag variable that will be null unless the new
+ // alloca's integer operations should be widened to this integer type due to
+ // passing isIntegerWideningViable above. If it is non-null, the desired
+ // integer type will be stored here for easy access during rewriting.
+ IntegerType *IntTy;
+
// If we are rewriting an alloca partition which can be written as pure
// vector operations, we stash extra information here. When VecTy is
// non-null, we have some strict guarantees about the rewritten alloca:
Type *ElementTy;
uint64_t ElementSize;
- // This is a convenience and flag variable that will be null unless the new
- // alloca's integer operations should be widened to this integer type due to
- // passing isIntegerWideningViable above. If it is non-null, the desired
- // integer type will be stored here for easy access during rewriting.
- IntegerType *IntTy;
-
// The original offset of the slice currently being rewritten relative to
// the original alloca.
uint64_t BeginOffset, EndOffset;
IRBuilderTy IRB;
public:
- AllocaSliceRewriter(const DataLayout &DL, AllocaSlices &S, SROA &Pass,
+ AllocaSliceRewriter(const DataLayout &DL, AllocaSlices &AS, SROA &Pass,
AllocaInst &OldAI, AllocaInst &NewAI,
uint64_t NewAllocaBeginOffset,
- uint64_t NewAllocaEndOffset, bool IsVectorPromotable,
- bool IsIntegerPromotable,
+ uint64_t NewAllocaEndOffset, bool IsIntegerPromotable,
+ VectorType *PromotableVecTy,
SmallPtrSetImpl<PHINode *> &PHIUsers,
SmallPtrSetImpl<SelectInst *> &SelectUsers)
- : DL(DL), S(S), Pass(Pass), OldAI(OldAI), NewAI(NewAI),
+ : DL(DL), AS(AS), Pass(Pass), OldAI(OldAI), NewAI(NewAI),
NewAllocaBeginOffset(NewAllocaBeginOffset),
NewAllocaEndOffset(NewAllocaEndOffset),
NewAllocaTy(NewAI.getAllocatedType()),
- VecTy(IsVectorPromotable ? cast<VectorType>(NewAllocaTy) : 0),
- ElementTy(VecTy ? VecTy->getElementType() : 0),
- ElementSize(VecTy ? DL.getTypeSizeInBits(ElementTy) / 8 : 0),
IntTy(IsIntegerPromotable
? Type::getIntNTy(
NewAI.getContext(),
DL.getTypeSizeInBits(NewAI.getAllocatedType()))
- : 0),
+ : nullptr),
+ VecTy(PromotableVecTy),
+ ElementTy(VecTy ? VecTy->getElementType() : nullptr),
+ ElementSize(VecTy ? DL.getTypeSizeInBits(ElementTy) / 8 : 0),
BeginOffset(), EndOffset(), IsSplittable(), IsSplit(), OldUse(),
OldPtr(), PHIUsers(PHIUsers), SelectUsers(SelectUsers),
IRB(NewAI.getContext(), ConstantFolder()) {
"Only multiple-of-8 sized vector elements are viable");
++NumVectorized;
}
- assert((!IsVectorPromotable && !IsIntegerPromotable) ||
- IsVectorPromotable != IsIntegerPromotable);
+ assert((!IntTy && !VecTy) || (IntTy && !VecTy) || (!IntTy && VecTy));
}
bool visit(AllocaSlices::const_iterator I) {
///
/// You can optionally pass a type to this routine and if that type's ABI
/// alignment is itself suitable, this will return zero.
- unsigned getSliceAlign(Type *Ty = 0) {
+ unsigned getSliceAlign(Type *Ty = nullptr) {
unsigned NewAIAlign = NewAI.getAlignment();
if (!NewAIAlign)
NewAIAlign = DL.getABITypeAlignment(NewAI.getAllocatedType());
if (!VecTy && !IntTy &&
(BeginOffset > NewAllocaBeginOffset ||
EndOffset < NewAllocaEndOffset ||
+ SliceSize != DL.getTypeStoreSize(AllocaTy) ||
!AllocaTy->isSingleValueType() ||
!DL.isLegalInteger(DL.getTypeSizeInBits(ScalarTy)) ||
DL.getTypeSizeInBits(ScalarTy)%8 != 0)) {
// If this doesn't map cleanly onto the alloca type, and that type isn't
// a single value type, just emit a memcpy.
- bool EmitMemCpy
- = !VecTy && !IntTy && (BeginOffset > NewAllocaBeginOffset ||
- EndOffset < NewAllocaEndOffset ||
- !NewAI.getAllocatedType()->isSingleValueType());
+ bool EmitMemCpy =
+ !VecTy && !IntTy &&
+ (BeginOffset > NewAllocaBeginOffset || EndOffset < NewAllocaEndOffset ||
+ SliceSize != DL.getTypeStoreSize(NewAI.getAllocatedType()) ||
+ !NewAI.getAllocatedType()->isSingleValueType());
// If we're just going to emit a memcpy, the alloca hasn't changed, and the
// size hasn't been shrunk based on analysis of the viable range, this is
unsigned EndIndex = VecTy ? getIndex(NewEndOffset) : 0;
unsigned NumElements = EndIndex - BeginIndex;
IntegerType *SubIntTy
- = IntTy ? Type::getIntNTy(IntTy->getContext(), Size*8) : 0;
+ = IntTy ? Type::getIntNTy(IntTy->getContext(), Size*8) : nullptr;
// Reset the other pointer type to match the register type we're going to
// use, but using the address space of the original other pointer.
// the old pointer, which necessarily must be in the right position to
// dominate the PHI.
IRBuilderTy PtrBuilder(IRB);
- PtrBuilder.SetInsertPoint(OldPtr);
+ if (isa<PHINode>(OldPtr))
+ PtrBuilder.SetInsertPoint(OldPtr->getParent()->getFirstInsertionPt());
+ else
+ PtrBuilder.SetInsertPoint(OldPtr);
PtrBuilder.SetCurrentDebugLocation(OldPtr->getDebugLoc());
Value *NewPtr = getNewAllocaSlicePtr(PtrBuilder, OldPtr->getType());
/// Enqueue all the users of the given instruction for further processing.
/// This uses a set to de-duplicate users.
void enqueueUsers(Instruction &I) {
- for (Value::use_iterator UI = I.use_begin(), UE = I.use_end(); UI != UE;
- ++UI)
- if (Visited.insert(*UI))
- Queue.push_back(&UI.getUse());
+ for (Use &U : I.uses())
+ if (Visited.insert(U.getUser()).second)
+ Queue.push_back(&U);
}
// Conservative default is to not rewrite anything.
return stripAggregateTypeWrapping(DL, Ty);
if (Offset > DL.getTypeAllocSize(Ty) ||
(DL.getTypeAllocSize(Ty) - Offset) < Size)
- return 0;
+ return nullptr;
if (SequentialType *SeqTy = dyn_cast<SequentialType>(Ty)) {
// We can't partition pointers...
if (SeqTy->isPointerTy())
- return 0;
+ return nullptr;
Type *ElementTy = SeqTy->getElementType();
uint64_t ElementSize = DL.getTypeAllocSize(ElementTy);
uint64_t NumSkippedElements = Offset / ElementSize;
if (ArrayType *ArrTy = dyn_cast<ArrayType>(SeqTy)) {
if (NumSkippedElements >= ArrTy->getNumElements())
- return 0;
+ return nullptr;
} else if (VectorType *VecTy = dyn_cast<VectorType>(SeqTy)) {
if (NumSkippedElements >= VecTy->getNumElements())
- return 0;
+ return nullptr;
}
Offset -= NumSkippedElements * ElementSize;
if (Offset > 0 || Size < ElementSize) {
// Bail if the partition ends in a different array element.
if ((Offset + Size) > ElementSize)
- return 0;
+ return nullptr;
// Recurse through the element type trying to peel off offset bytes.
return getTypePartition(DL, ElementTy, Offset, Size);
}
assert(Size > ElementSize);
uint64_t NumElements = Size / ElementSize;
if (NumElements * ElementSize != Size)
- return 0;
+ return nullptr;
return ArrayType::get(ElementTy, NumElements);
}
StructType *STy = dyn_cast<StructType>(Ty);
if (!STy)
- return 0;
+ return nullptr;
const StructLayout *SL = DL.getStructLayout(STy);
if (Offset >= SL->getSizeInBytes())
- return 0;
+ return nullptr;
uint64_t EndOffset = Offset + Size;
if (EndOffset > SL->getSizeInBytes())
- return 0;
+ return nullptr;
unsigned Index = SL->getElementContainingOffset(Offset);
Offset -= SL->getElementOffset(Index);
Type *ElementTy = STy->getElementType(Index);
uint64_t ElementSize = DL.getTypeAllocSize(ElementTy);
if (Offset >= ElementSize)
- return 0; // The offset points into alignment padding.
+ return nullptr; // The offset points into alignment padding.
// See if any partition must be contained by the element.
if (Offset > 0 || Size < ElementSize) {
if ((Offset + Size) > ElementSize)
- return 0;
+ return nullptr;
return getTypePartition(DL, ElementTy, Offset, Size);
}
assert(Offset == 0);
if (EndOffset < SL->getSizeInBytes()) {
unsigned EndIndex = SL->getElementContainingOffset(EndOffset);
if (Index == EndIndex)
- return 0; // Within a single element and its padding.
+ return nullptr; // Within a single element and its padding.
// Don't try to form "natural" types if the elements don't line up with the
// expected size.
// FIXME: We could potentially recurse down through the last element in the
// sub-struct to find a natural end point.
if (SL->getElementOffset(EndIndex) != EndOffset)
- return 0;
+ return nullptr;
assert(Index < EndIndex);
EE = STy->element_begin() + EndIndex;
STy->isPacked());
const StructLayout *SubSL = DL.getStructLayout(SubTy);
if (Size != SubSL->getSizeInBytes())
- return 0; // The sub-struct doesn't have quite the size needed.
+ return nullptr; // The sub-struct doesn't have quite the size needed.
return SubTy;
}
/// appropriate new offsets. It also evaluates how successful the rewrite was
/// at enabling promotion and if it was successful queues the alloca to be
/// promoted.
-bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &S,
+bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &AS,
AllocaSlices::iterator B, AllocaSlices::iterator E,
int64_t BeginOffset, int64_t EndOffset,
ArrayRef<AllocaSlices::iterator> SplitUses) {
// Try to compute a friendly type for this partition of the alloca. This
// won't always succeed, in which case we fall back to a legal integer type
// or an i8 array of an appropriate size.
- Type *SliceTy = 0;
+ Type *SliceTy = nullptr;
if (Type *CommonUseTy = findCommonType(B, E, EndOffset))
if (DL->getTypeAllocSize(CommonUseTy) >= SliceSize)
SliceTy = CommonUseTy;
SliceTy = ArrayType::get(Type::getInt8Ty(*C), SliceSize);
assert(DL->getTypeAllocSize(SliceTy) >= SliceSize);
- bool IsVectorPromotable = isVectorPromotionViable(
- *DL, SliceTy, S, BeginOffset, EndOffset, B, E, SplitUses);
+ bool IsIntegerPromotable = isIntegerWideningViable(
+ *DL, SliceTy, BeginOffset, AllocaSlices::const_range(B, E), SplitUses);
- bool IsIntegerPromotable =
- !IsVectorPromotable &&
- isIntegerWideningViable(*DL, SliceTy, BeginOffset, S, B, E, SplitUses);
+ VectorType *VecTy =
+ IsIntegerPromotable
+ ? nullptr
+ : isVectorPromotionViable(*DL, BeginOffset, EndOffset,
+ AllocaSlices::const_range(B, E), SplitUses);
+ if (VecTy)
+ SliceTy = VecTy;
// Check for the case where we're going to rewrite to a new alloca of the
// exact same type as the original, and with the same access offsets. In that
// the alloca's alignment unconstrained.
if (Alignment <= DL->getABITypeAlignment(SliceTy))
Alignment = 0;
- NewAI = new AllocaInst(SliceTy, 0, Alignment,
- AI.getName() + ".sroa." + Twine(B - S.begin()), &AI);
+ NewAI =
+ new AllocaInst(SliceTy, nullptr, Alignment,
+ AI.getName() + ".sroa." + Twine(B - AS.begin()), &AI);
++NumNewAllocas;
}
SmallPtrSet<PHINode *, 8> PHIUsers;
SmallPtrSet<SelectInst *, 8> SelectUsers;
- AllocaSliceRewriter Rewriter(*DL, S, *this, AI, *NewAI, BeginOffset,
- EndOffset, IsVectorPromotable,
- IsIntegerPromotable, PHIUsers, SelectUsers);
+ AllocaSliceRewriter Rewriter(*DL, AS, *this, AI, *NewAI, BeginOffset,
+ EndOffset, IsIntegerPromotable, VecTy, PHIUsers,
+ SelectUsers);
bool Promotable = true;
- for (ArrayRef<AllocaSlices::iterator>::const_iterator SUI = SplitUses.begin(),
- SUE = SplitUses.end();
- SUI != SUE; ++SUI) {
+ for (auto & SplitUse : SplitUses) {
DEBUG(dbgs() << " rewriting split ");
- DEBUG(S.printSlice(dbgs(), *SUI, ""));
- Promotable &= Rewriter.visit(*SUI);
+ DEBUG(AS.printSlice(dbgs(), SplitUse, ""));
+ Promotable &= Rewriter.visit(SplitUse);
++NumUses;
}
for (AllocaSlices::iterator I = B; I != E; ++I) {
DEBUG(dbgs() << " rewriting ");
- DEBUG(S.printSlice(dbgs(), I, ""));
+ DEBUG(AS.printSlice(dbgs(), I, ""));
Promotable &= Rewriter.visit(I);
++NumUses;
}
// If we have either PHIs or Selects to speculate, add them to those
// worklists and re-queue the new alloca so that we promote in on the
// next iteration.
- for (SmallPtrSetImpl<PHINode *>::iterator I = PHIUsers.begin(),
- E = PHIUsers.end();
- I != E; ++I)
- SpeculatablePHIs.insert(*I);
- for (SmallPtrSetImpl<SelectInst *>::iterator I = SelectUsers.begin(),
- E = SelectUsers.end();
- I != E; ++I)
- SpeculatableSelects.insert(*I);
+ for (PHINode *PHIUser : PHIUsers)
+ SpeculatablePHIs.insert(PHIUser);
+ for (SelectInst *SelectUser : SelectUsers)
+ SpeculatableSelects.insert(SelectUser);
Worklist.insert(NewAI);
}
} else {
// Recompute the max. While this is linear, so is remove_if.
MaxSplitUseEndOffset = 0;
- for (SmallVectorImpl<AllocaSlices::iterator>::iterator
- SUI = SplitUses.begin(),
- SUE = SplitUses.end();
- SUI != SUE; ++SUI)
- MaxSplitUseEndOffset = std::max((*SUI)->endOffset(), MaxSplitUseEndOffset);
+ for (AllocaSlices::iterator SplitUse : SplitUses)
+ MaxSplitUseEndOffset =
+ std::max(SplitUse->endOffset(), MaxSplitUseEndOffset);
}
/// \brief Walks the slices of an alloca and form partitions based on them,
/// rewriting each of their uses.
-bool SROA::splitAlloca(AllocaInst &AI, AllocaSlices &S) {
- if (S.begin() == S.end())
+bool SROA::splitAlloca(AllocaInst &AI, AllocaSlices &AS) {
+ if (AS.begin() == AS.end())
return false;
unsigned NumPartitions = 0;
SmallVector<AllocaSlices::iterator, 4> SplitUses;
uint64_t MaxSplitUseEndOffset = 0;
- uint64_t BeginOffset = S.begin()->beginOffset();
+ uint64_t BeginOffset = AS.begin()->beginOffset();
- for (AllocaSlices::iterator SI = S.begin(), SJ = std::next(SI), SE = S.end();
+ for (AllocaSlices::iterator SI = AS.begin(), SJ = std::next(SI),
+ SE = AS.end();
SI != SE; SI = SJ) {
uint64_t MaxEndOffset = SI->endOffset();
// we'll have to rewrite uses and erase old split uses.
if (BeginOffset < MaxEndOffset) {
// Rewrite a sequence of overlapping slices.
- Changed |=
- rewritePartition(AI, S, SI, SJ, BeginOffset, MaxEndOffset, SplitUses);
+ Changed |= rewritePartition(AI, AS, SI, SJ, BeginOffset, MaxEndOffset,
+ SplitUses);
++NumPartitions;
removeFinishedSplitUses(SplitUses, MaxSplitUseEndOffset, MaxEndOffset);
uint64_t PostSplitEndOffset =
SJ == SE ? MaxSplitUseEndOffset : SJ->beginOffset();
- Changed |= rewritePartition(AI, S, SJ, SJ, MaxEndOffset, PostSplitEndOffset,
- SplitUses);
+ Changed |= rewritePartition(AI, AS, SJ, SJ, MaxEndOffset,
+ PostSplitEndOffset, SplitUses);
++NumPartitions;
if (SJ == SE)
Changed |= AggRewriter.rewrite(AI);
// Build the slices using a recursive instruction-visiting builder.
- AllocaSlices S(*DL, AI);
- DEBUG(S.print(dbgs()));
- if (S.isEscaped())
+ AllocaSlices AS(*DL, AI);
+ DEBUG(AS.print(dbgs()));
+ if (AS.isEscaped())
return Changed;
// Delete all the dead users of this alloca before splitting and rewriting it.
- for (AllocaSlices::dead_user_iterator DI = S.dead_user_begin(),
- DE = S.dead_user_end();
- DI != DE; ++DI) {
+ for (Instruction *DeadUser : AS.getDeadUsers()) {
// Free up everything used by this instruction.
- for (Use &DeadOp : (*DI)->operands())
+ for (Use &DeadOp : DeadUser->operands())
clobberUse(DeadOp);
// Now replace the uses of this instruction.
- (*DI)->replaceAllUsesWith(UndefValue::get((*DI)->getType()));
+ DeadUser->replaceAllUsesWith(UndefValue::get(DeadUser->getType()));
// And mark it for deletion.
- DeadInsts.insert(*DI);
+ DeadInsts.insert(DeadUser);
Changed = true;
}
- for (AllocaSlices::dead_op_iterator DO = S.dead_op_begin(),
- DE = S.dead_op_end();
- DO != DE; ++DO) {
- clobberUse(**DO);
+ for (Use *DeadOp : AS.getDeadOperands()) {
+ clobberUse(*DeadOp);
Changed = true;
}
// No slices to split. Leave the dead alloca for a later pass to clean up.
- if (S.begin() == S.end())
+ if (AS.begin() == AS.end())
return Changed;
- Changed |= splitAlloca(AI, S);
+ Changed |= splitAlloca(AI, AS);
DEBUG(dbgs() << " Speculating PHIs\n");
while (!SpeculatablePHIs.empty())
///
/// We also record the alloca instructions deleted here so that they aren't
/// subsequently handed to mem2reg to promote.
-void SROA::deleteDeadInstructions(SmallPtrSet<AllocaInst*, 4> &DeletedAllocas) {
+void SROA::deleteDeadInstructions(SmallPtrSetImpl<AllocaInst*> &DeletedAllocas) {
while (!DeadInsts.empty()) {
Instruction *I = DeadInsts.pop_back_val();
DEBUG(dbgs() << "Deleting dead instruction: " << *I << "\n");
for (Use &Operand : I->operands())
if (Instruction *U = dyn_cast<Instruction>(Operand)) {
// Zero out the operand and see if it becomes trivially dead.
- Operand = 0;
+ Operand = nullptr;
if (isInstructionTriviallyDead(U))
DeadInsts.insert(U);
}
static void enqueueUsersInWorklist(Instruction &I,
SmallVectorImpl<Instruction *> &Worklist,
- SmallPtrSet<Instruction *, 8> &Visited) {
- for (Value::use_iterator UI = I.use_begin(), UE = I.use_end(); UI != UE;
- ++UI)
- if (Visited.insert(cast<Instruction>(*UI)))
- Worklist.push_back(cast<Instruction>(*UI));
+ SmallPtrSetImpl<Instruction *> &Visited) {
+ for (User *U : I.users())
+ if (Visited.insert(cast<Instruction>(U)).second)
+ Worklist.push_back(cast<Instruction>(U));
}
/// \brief Promote the allocas, using the best available technique.
if (DT && !ForceSSAUpdater) {
DEBUG(dbgs() << "Promoting allocas with mem2reg...\n");
- PromoteMemToReg(PromotableAllocas, *DT);
+ PromoteMemToReg(PromotableAllocas, *DT, nullptr, AT);
PromotableAllocas.clear();
return true;
}
DEBUG(dbgs() << "Promoting allocas with SSAUpdater...\n");
SSAUpdater SSA;
- DIBuilder DIB(*F.getParent());
+ DIBuilder DIB(*F.getParent(), /*AllowUnresolved*/ false);
SmallVector<Instruction *, 64> Insts;
// We need a worklist to walk the uses of each alloca.
DL = &DLP->getDataLayout();
DominatorTreeWrapperPass *DTWP =
getAnalysisIfAvailable<DominatorTreeWrapperPass>();
- DT = DTWP ? &DTWP->getDomTree() : 0;
+ DT = DTWP ? &DTWP->getDomTree() : nullptr;
+ AT = &getAnalysis<AssumptionTracker>();
BasicBlock &EntryBB = F.getEntryBlock();
for (BasicBlock::iterator I = EntryBB.begin(), E = std::prev(EntryBB.end());
}
void SROA::getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<AssumptionTracker>();
if (RequiresDomTree)
AU.addRequired<DominatorTreeWrapperPass>();
AU.setPreservesCFG();
projects / oota-llvm.git / blobdiff