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-rw-r--r--lib/Transforms/Scalar/SROA.cpp106
1 files changed, 55 insertions, 51 deletions
diff --git a/lib/Transforms/Scalar/SROA.cpp b/lib/Transforms/Scalar/SROA.cpp
index ed5e618..04bf4f8 100644
--- a/lib/Transforms/Scalar/SROA.cpp
+++ b/lib/Transforms/Scalar/SROA.cpp
@@ -23,7 +23,6 @@
///
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "sroa"
#include "llvm/Transforms/Scalar.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SetVector.h"
@@ -64,6 +63,8 @@
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");
@@ -159,8 +160,8 @@ public:
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.
///
@@ -320,7 +321,7 @@ static Value *foldSelectInst(SelectInst &SI) {
if (SI.getOperand(1) == SI.getOperand(2))
return SI.getOperand(1);
- return 0;
+ return nullptr;
}
/// \brief Builder for the alloca slices.
@@ -642,7 +643,7 @@ private:
Uses.push_back(std::make_pair(I, cast<Instruction>(U)));
} while (!Uses.empty());
- return 0;
+ return nullptr;
}
void visitPHINode(PHINode &PN) {
@@ -724,7 +725,7 @@ AllocaSlices::AllocaSlices(const DataLayout &DL, AllocaInst &AI)
#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()) {
@@ -873,7 +874,7 @@ public:
for (SmallVectorImpl<DbgValueInst *>::const_iterator I = DVIs.begin(),
E = DVIs.end(); I != E; ++I) {
DbgValueInst *DVI = *I;
- Value *Arg = 0;
+ 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.
@@ -969,7 +970,7 @@ class SROA : public FunctionPass {
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;
@@ -1011,9 +1012,9 @@ INITIALIZE_PASS_END(SROA, "sroa", "Scalar Replacement Of Aggregates",
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.
@@ -1024,7 +1025,7 @@ static Type *findCommonType(AllocaSlices::const_iterator B,
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())) {
@@ -1074,7 +1075,7 @@ static Type *findCommonType(AllocaSlices::const_iterator B,
/// 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.
@@ -1084,7 +1085,7 @@ static bool isSafePHIToSpeculate(PHINode &PN,
bool HaveLoad = false;
for (User *U : PN.users()) {
LoadInst *LI = dyn_cast<LoadInst>(U);
- if (LI == 0 || !LI->isSimple())
+ if (!LI || !LI->isSimple())
return false;
// For now we only allow loads in the same block as the PHI. This is
@@ -1191,7 +1192,8 @@ static void speculatePHINodeLoads(PHINode &PN) {
///
/// 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();
@@ -1199,7 +1201,7 @@ static bool isSafeSelectToSpeculate(SelectInst &SI, const DataLayout *DL = 0) {
for (User *U : SI.users()) {
LoadInst *LI = dyn_cast<LoadInst>(U);
- if (LI == 0 || !LI->isSimple())
+ if (!LI || !LI->isSimple())
return false;
// Both operands to the select need to be dereferencable, either
@@ -1332,19 +1334,21 @@ static Value *getNaturalGEPRecursively(IRBuilderTy &IRB, const DataLayout &DL,
// 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(),
@@ -1356,7 +1360,7 @@ static Value *getNaturalGEPRecursively(IRBuilderTy &IRB, const DataLayout &DL,
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));
@@ -1366,17 +1370,17 @@ static Value *getNaturalGEPRecursively(IRBuilderTy &IRB, const DataLayout &DL,
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,
@@ -1402,14 +1406,14 @@ static Value *getNaturalGEPWithOffset(IRBuilderTy &IRB, const DataLayout &DL,
// 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;
@@ -1445,11 +1449,11 @@ static Value *getAdjustedPtr(IRBuilderTy &IRB, const DataLayout &DL, Value *Ptr,
// 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();
@@ -2043,14 +2047,14 @@ public:
NewAllocaBeginOffset(NewAllocaBeginOffset),
NewAllocaEndOffset(NewAllocaEndOffset),
NewAllocaTy(NewAI.getAllocatedType()),
- VecTy(IsVectorPromotable ? cast<VectorType>(NewAllocaTy) : 0),
- ElementTy(VecTy ? VecTy->getElementType() : 0),
+ VecTy(IsVectorPromotable ? cast<VectorType>(NewAllocaTy) : nullptr),
+ ElementTy(VecTy ? VecTy->getElementType() : nullptr),
ElementSize(VecTy ? DL.getTypeSizeInBits(ElementTy) / 8 : 0),
IntTy(IsIntegerPromotable
? Type::getIntNTy(
NewAI.getContext(),
DL.getTypeSizeInBits(NewAI.getAllocatedType()))
- : 0),
+ : nullptr),
BeginOffset(), EndOffset(), IsSplittable(), IsSplit(), OldUse(),
OldPtr(), PHIUsers(PHIUsers), SelectUsers(SelectUsers),
IRB(NewAI.getContext(), ConstantFolder()) {
@@ -2144,7 +2148,7 @@ private:
///
/// 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());
@@ -2594,7 +2598,7 @@ private:
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.
@@ -2992,22 +2996,22 @@ static Type *getTypePartition(const DataLayout &DL, Type *Ty,
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;
@@ -3015,7 +3019,7 @@ static Type *getTypePartition(const DataLayout &DL, Type *Ty,
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);
}
@@ -3026,20 +3030,20 @@ static Type *getTypePartition(const DataLayout &DL, Type *Ty,
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);
@@ -3047,12 +3051,12 @@ static Type *getTypePartition(const DataLayout &DL, Type *Ty,
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);
@@ -3065,14 +3069,14 @@ static Type *getTypePartition(const DataLayout &DL, Type *Ty,
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;
@@ -3083,7 +3087,7 @@ static Type *getTypePartition(const DataLayout &DL, Type *Ty,
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;
}
@@ -3108,7 +3112,7 @@ bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &S,
// 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;
@@ -3155,7 +3159,7 @@ bool SROA::rewritePartition(AllocaInst &AI, AllocaSlices &S,
// the alloca's alignment unconstrained.
if (Alignment <= DL->getABITypeAlignment(SliceTy))
Alignment = 0;
- NewAI = new AllocaInst(SliceTy, 0, Alignment,
+ NewAI = new AllocaInst(SliceTy, nullptr, Alignment,
AI.getName() + ".sroa." + Twine(B - S.begin()), &AI);
++NumNewAllocas;
}
@@ -3494,7 +3498,7 @@ void SROA::deleteDeadInstructions(SmallPtrSet<AllocaInst*, 4> &DeletedAllocas) {
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);
}
@@ -3612,7 +3616,7 @@ bool SROA::runOnFunction(Function &F) {
DL = &DLP->getDataLayout();
DominatorTreeWrapperPass *DTWP =
getAnalysisIfAvailable<DominatorTreeWrapperPass>();
- DT = DTWP ? &DTWP->getDomTree() : 0;
+ DT = DTWP ? &DTWP->getDomTree() : nullptr;
BasicBlock &EntryBB = F.getEntryBlock();
for (BasicBlock::iterator I = EntryBB.begin(), E = std::prev(EntryBB.end());
generated by cgit v1.1 at 2024-12-22 14:30:32 +0000