/// new index representing the remainder (equal to the original index minus
/// the constant offset), or nullptr if we cannot extract a constant offset.
/// \p Idx The given GEP index
- /// \p DL The datalayout of the module
/// \p GEP The given GEP
- static Value *Extract(Value *Idx, const DataLayout *DL,
- GetElementPtrInst *GEP);
+ static Value *Extract(Value *Idx, GetElementPtrInst *GEP);
/// Looks for a constant offset from the given GEP index without extracting
/// it. It returns the numeric value of the extracted constant offset (0 if
/// failed). The meaning of the arguments are the same as Extract.
- static int64_t Find(Value *Idx, const DataLayout *DL, GetElementPtrInst *GEP);
+ static int64_t Find(Value *Idx, GetElementPtrInst *GEP);
private:
- ConstantOffsetExtractor(const DataLayout *Layout, Instruction *InsertionPt)
- : DL(Layout), IP(InsertionPt) {}
+ ConstantOffsetExtractor(Instruction *InsertionPt) : IP(InsertionPt) {}
/// Searches the expression that computes V for a non-zero constant C s.t.
/// V can be reassociated into the form V' + C. If the searching is
/// successful, returns C and update UserChain as a def-use chain from C to V;
/// A data structure used in rebuildWithoutConstOffset. Contains all
/// sext/zext instructions along UserChain.
SmallVector<CastInst *, 16> ExtInsts;
- /// The data layout of the module. Used in ComputeKnownBits.
- const DataLayout *DL;
Instruction *IP; /// Insertion position of cloned instructions.
};
AU.setPreservesCFG();
}
- bool doInitialization(Module &M) override {
- DL = &M.getDataLayout();
- return false;
- }
-
bool runOnFunction(Function &F) override;
private:
/// Verified in @i32_add in split-gep.ll
bool canonicalizeArrayIndicesToPointerSize(GetElementPtrInst *GEP);
- const DataLayout *DL;
const TargetMachine *TM;
/// Whether to lower a GEP with multiple indices into arithmetic operations or
/// multiple GEPs with a single index.
return BO;
}
-Value *ConstantOffsetExtractor::Extract(Value *Idx, const DataLayout *DL,
- GetElementPtrInst *GEP) {
- ConstantOffsetExtractor Extractor(DL, GEP);
+Value *ConstantOffsetExtractor::Extract(Value *Idx, GetElementPtrInst *GEP) {
+ ConstantOffsetExtractor Extractor(GEP);
// Find a non-zero constant offset first.
APInt ConstantOffset =
Extractor.find(Idx, /* SignExtended */ false, /* ZeroExtended */ false,
return Extractor.rebuildWithoutConstOffset();
}
-int64_t ConstantOffsetExtractor::Find(Value *Idx, const DataLayout *DL,
- GetElementPtrInst *GEP) {
+int64_t ConstantOffsetExtractor::Find(Value *Idx, GetElementPtrInst *GEP) {
// If Idx is an index of an inbound GEP, Idx is guaranteed to be non-negative.
- return ConstantOffsetExtractor(DL, GEP)
+ return ConstantOffsetExtractor(GEP)
.find(Idx, /* SignExtended */ false, /* ZeroExtended */ false,
GEP->isInBounds())
.getSExtValue();
IntegerType *IT = cast<IntegerType>(V->getType());
KnownOne = APInt(IT->getBitWidth(), 0);
KnownZero = APInt(IT->getBitWidth(), 0);
+ const DataLayout &DL = IP->getModule()->getDataLayout();
llvm::computeKnownBits(V, KnownZero, KnownOne, DL, 0);
}
bool SeparateConstOffsetFromGEP::canonicalizeArrayIndicesToPointerSize(
GetElementPtrInst *GEP) {
bool Changed = false;
- Type *IntPtrTy = DL->getIntPtrType(GEP->getType());
+ const DataLayout &DL = GEP->getModule()->getDataLayout();
+ Type *IntPtrTy = DL.getIntPtrType(GEP->getType());
gep_type_iterator GTI = gep_type_begin(*GEP);
for (User::op_iterator I = GEP->op_begin() + 1, E = GEP->op_end();
I != E; ++I, ++GTI) {
NeedsExtraction = false;
int64_t AccumulativeByteOffset = 0;
gep_type_iterator GTI = gep_type_begin(*GEP);
+ const DataLayout &DL = GEP->getModule()->getDataLayout();
for (unsigned I = 1, E = GEP->getNumOperands(); I != E; ++I, ++GTI) {
if (isa<SequentialType>(*GTI)) {
// Tries to extract a constant offset from this GEP index.
int64_t ConstantOffset =
- ConstantOffsetExtractor::Find(GEP->getOperand(I), DL, GEP);
+ ConstantOffsetExtractor::Find(GEP->getOperand(I), GEP);
if (ConstantOffset != 0) {
NeedsExtraction = true;
// A GEP may have multiple indices. We accumulate the extracted
// constant offset to a byte offset, and later offset the remainder of
// the original GEP with this byte offset.
AccumulativeByteOffset +=
- ConstantOffset * DL->getTypeAllocSize(GTI.getIndexedType());
+ ConstantOffset * DL.getTypeAllocSize(GTI.getIndexedType());
}
} else if (LowerGEP) {
StructType *StTy = cast<StructType>(*GTI);
if (Field != 0) {
NeedsExtraction = true;
AccumulativeByteOffset +=
- DL->getStructLayout(StTy)->getElementOffset(Field);
+ DL.getStructLayout(StTy)->getElementOffset(Field);
}
}
}
void SeparateConstOffsetFromGEP::lowerToSingleIndexGEPs(
GetElementPtrInst *Variadic, int64_t AccumulativeByteOffset) {
IRBuilder<> Builder(Variadic);
- Type *IntPtrTy = DL->getIntPtrType(Variadic->getType());
+ const DataLayout &DL = Variadic->getModule()->getDataLayout();
+ Type *IntPtrTy = DL.getIntPtrType(Variadic->getType());
Type *I8PtrTy =
Builder.getInt8PtrTy(Variadic->getType()->getPointerAddressSpace());
continue;
APInt ElementSize = APInt(IntPtrTy->getIntegerBitWidth(),
- DL->getTypeAllocSize(GTI.getIndexedType()));
+ DL.getTypeAllocSize(GTI.getIndexedType()));
// Scale the index by element size.
if (ElementSize != 1) {
if (ElementSize.isPowerOf2()) {
SeparateConstOffsetFromGEP::lowerToArithmetics(GetElementPtrInst *Variadic,
int64_t AccumulativeByteOffset) {
IRBuilder<> Builder(Variadic);
- Type *IntPtrTy = DL->getIntPtrType(Variadic->getType());
+ const DataLayout &DL = Variadic->getModule()->getDataLayout();
+ Type *IntPtrTy = DL.getIntPtrType(Variadic->getType());
Value *ResultPtr = Builder.CreatePtrToInt(Variadic->getOperand(0), IntPtrTy);
gep_type_iterator GTI = gep_type_begin(*Variadic);
continue;
APInt ElementSize = APInt(IntPtrTy->getIntegerBitWidth(),
- DL->getTypeAllocSize(GTI.getIndexedType()));
+ DL.getTypeAllocSize(GTI.getIndexedType()));
// Scale the index by element size.
if (ElementSize != 1) {
if (ElementSize.isPowerOf2()) {
if (isa<SequentialType>(*GTI)) {
// Splits this GEP index into a variadic part and a constant offset, and
// uses the variadic part as the new index.
- Value *NewIdx =
- ConstantOffsetExtractor::Extract(GEP->getOperand(I), DL, GEP);
+ Value *NewIdx = ConstantOffsetExtractor::Extract(GEP->getOperand(I), GEP);
if (NewIdx != nullptr) {
GEP->setOperand(I, NewIdx);
}
// Per ANSI C standard, signed / unsigned = unsigned and signed % unsigned =
// unsigned.. Therefore, we cast ElementTypeSizeOfGEP to signed because it is
// used with unsigned integers later.
+ const DataLayout &DL = GEP->getModule()->getDataLayout();
int64_t ElementTypeSizeOfGEP = static_cast<int64_t>(
- DL->getTypeAllocSize(GEP->getType()->getElementType()));
- Type *IntPtrTy = DL->getIntPtrType(GEP->getType());
+ DL.getTypeAllocSize(GEP->getType()->getElementType()));
+ Type *IntPtrTy = DL.getIntPtrType(GEP->getType());
if (AccumulativeByteOffset % ElementTypeSizeOfGEP == 0) {
// Very likely. As long as %gep is natually aligned, the byte offset we
// extracted should be a multiple of sizeof(*%gep).
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