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Diffstat (limited to 'lib/Transforms/InstCombine/InstCombineCasts.cpp')
-rw-r--r--lib/Transforms/InstCombine/InstCombineCasts.cpp89
1 files changed, 46 insertions, 43 deletions
diff --git a/lib/Transforms/InstCombine/InstCombineCasts.cpp b/lib/Transforms/InstCombine/InstCombineCasts.cpp
index c2b862a5ff..356803ad7c 100644
--- a/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -19,6 +19,8 @@
using namespace llvm;
using namespace PatternMatch;
+#define DEBUG_TYPE "instcombine"
+
/// DecomposeSimpleLinearExpr - Analyze 'Val', seeing if it is a simple linear
/// expression. If so, decompose it, returning some value X, such that Val is
/// X*Scale+Offset.
@@ -79,7 +81,7 @@ static Value *DecomposeSimpleLinearExpr(Value *Val, unsigned &Scale,
Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
AllocaInst &AI) {
// This requires DataLayout to get the alloca alignment and size information.
- if (!DL) return 0;
+ if (!DL) return nullptr;
PointerType *PTy = cast<PointerType>(CI.getType());
@@ -89,26 +91,26 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
// Get the type really allocated and the type casted to.
Type *AllocElTy = AI.getAllocatedType();
Type *CastElTy = PTy->getElementType();
- if (!AllocElTy->isSized() || !CastElTy->isSized()) return 0;
+ if (!AllocElTy->isSized() || !CastElTy->isSized()) return nullptr;
unsigned AllocElTyAlign = DL->getABITypeAlignment(AllocElTy);
unsigned CastElTyAlign = DL->getABITypeAlignment(CastElTy);
- if (CastElTyAlign < AllocElTyAlign) return 0;
+ if (CastElTyAlign < AllocElTyAlign) return nullptr;
// If the allocation has multiple uses, only promote it if we are strictly
// increasing the alignment of the resultant allocation. If we keep it the
// same, we open the door to infinite loops of various kinds.
- if (!AI.hasOneUse() && CastElTyAlign == AllocElTyAlign) return 0;
+ if (!AI.hasOneUse() && CastElTyAlign == AllocElTyAlign) return nullptr;
uint64_t AllocElTySize = DL->getTypeAllocSize(AllocElTy);
uint64_t CastElTySize = DL->getTypeAllocSize(CastElTy);
- if (CastElTySize == 0 || AllocElTySize == 0) return 0;
+ if (CastElTySize == 0 || AllocElTySize == 0) return nullptr;
// If the allocation has multiple uses, only promote it if we're not
// shrinking the amount of memory being allocated.
uint64_t AllocElTyStoreSize = DL->getTypeStoreSize(AllocElTy);
uint64_t CastElTyStoreSize = DL->getTypeStoreSize(CastElTy);
- if (!AI.hasOneUse() && CastElTyStoreSize < AllocElTyStoreSize) return 0;
+ if (!AI.hasOneUse() && CastElTyStoreSize < AllocElTyStoreSize) return nullptr;
// See if we can satisfy the modulus by pulling a scale out of the array
// size argument.
@@ -120,10 +122,10 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
// If we can now satisfy the modulus, by using a non-1 scale, we really can
// do the xform.
if ((AllocElTySize*ArraySizeScale) % CastElTySize != 0 ||
- (AllocElTySize*ArrayOffset ) % CastElTySize != 0) return 0;
+ (AllocElTySize*ArrayOffset ) % CastElTySize != 0) return nullptr;
unsigned Scale = (AllocElTySize*ArraySizeScale)/CastElTySize;
- Value *Amt = 0;
+ Value *Amt = nullptr;
if (Scale == 1) {
Amt = NumElements;
} else {
@@ -141,6 +143,7 @@ Instruction *InstCombiner::PromoteCastOfAllocation(BitCastInst &CI,
AllocaInst *New = AllocaBuilder.CreateAlloca(CastElTy, Amt);
New->setAlignment(AI.getAlignment());
New->takeName(&AI);
+ New->setUsedWithInAlloca(AI.isUsedWithInAlloca());
// If the allocation has multiple real uses, insert a cast and change all
// things that used it to use the new cast. This will also hack on CI, but it
@@ -169,7 +172,7 @@ Value *InstCombiner::EvaluateInDifferentType(Value *V, Type *Ty,
// Otherwise, it must be an instruction.
Instruction *I = cast<Instruction>(V);
- Instruction *Res = 0;
+ Instruction *Res = nullptr;
unsigned Opc = I->getOpcode();
switch (Opc) {
case Instruction::Add:
@@ -245,11 +248,11 @@ isEliminableCastPair(
Instruction::CastOps firstOp = Instruction::CastOps(CI->getOpcode());
Instruction::CastOps secondOp = Instruction::CastOps(opcode);
Type *SrcIntPtrTy = DL && SrcTy->isPtrOrPtrVectorTy() ?
- DL->getIntPtrType(SrcTy) : 0;
+ DL->getIntPtrType(SrcTy) : nullptr;
Type *MidIntPtrTy = DL && MidTy->isPtrOrPtrVectorTy() ?
- DL->getIntPtrType(MidTy) : 0;
+ DL->getIntPtrType(MidTy) : nullptr;
Type *DstIntPtrTy = DL && DstTy->isPtrOrPtrVectorTy() ?
- DL->getIntPtrType(DstTy) : 0;
+ DL->getIntPtrType(DstTy) : nullptr;
unsigned Res = CastInst::isEliminableCastPair(firstOp, secondOp, SrcTy, MidTy,
DstTy, SrcIntPtrTy, MidIntPtrTy,
DstIntPtrTy);
@@ -318,7 +321,7 @@ Instruction *InstCombiner::commonCastTransforms(CastInst &CI) {
return NV;
}
- return 0;
+ return nullptr;
}
/// CanEvaluateTruncated - Return true if we can evaluate the specified
@@ -470,7 +473,7 @@ Instruction *InstCombiner::visitTrunc(TruncInst &CI) {
}
// Transform trunc(lshr (zext A), Cst) to eliminate one type conversion.
- Value *A = 0; ConstantInt *Cst = 0;
+ Value *A = nullptr; ConstantInt *Cst = nullptr;
if (Src->hasOneUse() &&
match(Src, m_LShr(m_ZExt(m_Value(A)), m_ConstantInt(Cst)))) {
// We have three types to worry about here, the type of A, the source of
@@ -502,7 +505,7 @@ Instruction *InstCombiner::visitTrunc(TruncInst &CI) {
ConstantExpr::getTrunc(Cst, CI.getType()));
}
- return 0;
+ return nullptr;
}
/// transformZExtICmp - Transform (zext icmp) to bitwise / integer operations
@@ -550,7 +553,7 @@ Instruction *InstCombiner::transformZExtICmp(ICmpInst *ICI, Instruction &CI,
// If Op1C some other power of two, convert:
uint32_t BitWidth = Op1C->getType()->getBitWidth();
APInt KnownZero(BitWidth, 0), KnownOne(BitWidth, 0);
- ComputeMaskedBits(ICI->getOperand(0), KnownZero, KnownOne);
+ computeKnownBits(ICI->getOperand(0), KnownZero, KnownOne);
APInt KnownZeroMask(~KnownZero);
if (KnownZeroMask.isPowerOf2()) { // Exactly 1 possible 1?
@@ -598,8 +601,8 @@ Instruction *InstCombiner::transformZExtICmp(ICmpInst *ICI, Instruction &CI,
APInt KnownZeroLHS(BitWidth, 0), KnownOneLHS(BitWidth, 0);
APInt KnownZeroRHS(BitWidth, 0), KnownOneRHS(BitWidth, 0);
- ComputeMaskedBits(LHS, KnownZeroLHS, KnownOneLHS);
- ComputeMaskedBits(RHS, KnownZeroRHS, KnownOneRHS);
+ computeKnownBits(LHS, KnownZeroLHS, KnownOneLHS);
+ computeKnownBits(RHS, KnownZeroRHS, KnownOneRHS);
if (KnownZeroLHS == KnownZeroRHS && KnownOneLHS == KnownOneRHS) {
APInt KnownBits = KnownZeroLHS | KnownOneLHS;
@@ -627,7 +630,7 @@ Instruction *InstCombiner::transformZExtICmp(ICmpInst *ICI, Instruction &CI,
}
}
- return 0;
+ return nullptr;
}
/// CanEvaluateZExtd - Determine if the specified value can be computed in the
@@ -758,7 +761,7 @@ Instruction *InstCombiner::visitZExt(ZExtInst &CI) {
// If this zero extend is only used by a truncate, let the truncate be
// eliminated before we try to optimize this zext.
if (CI.hasOneUse() && isa<TruncInst>(CI.user_back()))
- return 0;
+ return nullptr;
// If one of the common conversion will work, do it.
if (Instruction *Result = commonCastTransforms(CI))
@@ -883,7 +886,7 @@ Instruction *InstCombiner::visitZExt(ZExtInst &CI) {
return BinaryOperator::CreateXor(New, ConstantInt::get(CI.getType(), 1));
}
- return 0;
+ return nullptr;
}
/// transformSExtICmp - Transform (sext icmp) to bitwise / integer operations
@@ -918,7 +921,7 @@ Instruction *InstCombiner::transformSExtICmp(ICmpInst *ICI, Instruction &CI) {
ICI->isEquality() && (Op1C->isZero() || Op1C->getValue().isPowerOf2())){
unsigned BitWidth = Op1C->getType()->getBitWidth();
APInt KnownZero(BitWidth, 0), KnownOne(BitWidth, 0);
- ComputeMaskedBits(Op0, KnownZero, KnownOne);
+ computeKnownBits(Op0, KnownZero, KnownOne);
APInt KnownZeroMask(~KnownZero);
if (KnownZeroMask.isPowerOf2()) {
@@ -967,7 +970,7 @@ Instruction *InstCombiner::transformSExtICmp(ICmpInst *ICI, Instruction &CI) {
}
}
- return 0;
+ return nullptr;
}
/// CanEvaluateSExtd - Return true if we can take the specified value
@@ -1039,7 +1042,7 @@ Instruction *InstCombiner::visitSExt(SExtInst &CI) {
// If this sign extend is only used by a truncate, let the truncate be
// eliminated before we try to optimize this sext.
if (CI.hasOneUse() && isa<TruncInst>(CI.user_back()))
- return 0;
+ return nullptr;
if (Instruction *I = commonCastTransforms(CI))
return I;
@@ -1107,9 +1110,9 @@ Instruction *InstCombiner::visitSExt(SExtInst &CI) {
// into:
// %a = shl i32 %i, 30
// %d = ashr i32 %a, 30
- Value *A = 0;
+ Value *A = nullptr;
// TODO: Eventually this could be subsumed by EvaluateInDifferentType.
- ConstantInt *BA = 0, *CA = 0;
+ ConstantInt *BA = nullptr, *CA = nullptr;
if (match(Src, m_AShr(m_Shl(m_Trunc(m_Value(A)), m_ConstantInt(BA)),
m_ConstantInt(CA))) &&
BA == CA && A->getType() == CI.getType()) {
@@ -1121,7 +1124,7 @@ Instruction *InstCombiner::visitSExt(SExtInst &CI) {
return BinaryOperator::CreateAShr(A, ShAmtV);
}
- return 0;
+ return nullptr;
}
@@ -1133,7 +1136,7 @@ static Constant *FitsInFPType(ConstantFP *CFP, const fltSemantics &Sem) {
(void)F.convert(Sem, APFloat::rmNearestTiesToEven, &losesInfo);
if (!losesInfo)
return ConstantFP::get(CFP->getContext(), F);
- return 0;
+ return nullptr;
}
/// LookThroughFPExtensions - If this is an fp extension instruction, look
@@ -1345,7 +1348,7 @@ Instruction *InstCombiner::visitFPTrunc(FPTruncInst &CI) {
}
}
- return 0;
+ return nullptr;
}
Instruction *InstCombiner::visitFPExt(CastInst &CI) {
@@ -1354,7 +1357,7 @@ Instruction *InstCombiner::visitFPExt(CastInst &CI) {
Instruction *InstCombiner::visitFPToUI(FPToUIInst &FI) {
Instruction *OpI = dyn_cast<Instruction>(FI.getOperand(0));
- if (OpI == 0)
+ if (!OpI)
return commonCastTransforms(FI);
// fptoui(uitofp(X)) --> X
@@ -1374,7 +1377,7 @@ Instruction *InstCombiner::visitFPToUI(FPToUIInst &FI) {
Instruction *InstCombiner::visitFPToSI(FPToSIInst &FI) {
Instruction *OpI = dyn_cast<Instruction>(FI.getOperand(0));
- if (OpI == 0)
+ if (!OpI)
return commonCastTransforms(FI);
// fptosi(sitofp(X)) --> X
@@ -1421,7 +1424,7 @@ Instruction *InstCombiner::visitIntToPtr(IntToPtrInst &CI) {
if (Instruction *I = commonCastTransforms(CI))
return I;
- return 0;
+ return nullptr;
}
/// @brief Implement the transforms for cast of pointer (bitcast/ptrtoint)
@@ -1520,7 +1523,7 @@ static Instruction *OptimizeVectorResize(Value *InVal, VectorType *DestTy,
// there yet.
if (SrcTy->getElementType()->getPrimitiveSizeInBits() !=
DestTy->getElementType()->getPrimitiveSizeInBits())
- return 0;
+ return nullptr;
SrcTy = VectorType::get(DestTy->getElementType(), SrcTy->getNumElements());
InVal = IC.Builder->CreateBitCast(InVal, SrcTy);
@@ -1598,7 +1601,7 @@ static bool CollectInsertionElements(Value *V, unsigned Shift,
ElementIndex = Elements.size() - ElementIndex - 1;
// Fail if multiple elements are inserted into this slot.
- if (Elements[ElementIndex] != 0)
+ if (Elements[ElementIndex])
return false;
Elements[ElementIndex] = V;
@@ -1638,7 +1641,7 @@ static bool CollectInsertionElements(Value *V, unsigned Shift,
if (!V->hasOneUse()) return false;
Instruction *I = dyn_cast<Instruction>(V);
- if (I == 0) return false;
+ if (!I) return false;
switch (I->getOpcode()) {
default: return false; // Unhandled case.
case Instruction::BitCast:
@@ -1659,7 +1662,7 @@ static bool CollectInsertionElements(Value *V, unsigned Shift,
case Instruction::Shl: {
// Must be shifting by a constant that is a multiple of the element size.
ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1));
- if (CI == 0) return false;
+ if (!CI) return false;
Shift += CI->getZExtValue();
if (!isMultipleOfTypeSize(Shift, VecEltTy)) return false;
return CollectInsertionElements(I->getOperand(0), Shift,
@@ -1687,7 +1690,7 @@ static bool CollectInsertionElements(Value *V, unsigned Shift,
static Value *OptimizeIntegerToVectorInsertions(BitCastInst &CI,
InstCombiner &IC) {
// We need to know the target byte order to perform this optimization.
- if (!IC.getDataLayout()) return 0;
+ if (!IC.getDataLayout()) return nullptr;
VectorType *DestVecTy = cast<VectorType>(CI.getType());
Value *IntInput = CI.getOperand(0);
@@ -1695,14 +1698,14 @@ static Value *OptimizeIntegerToVectorInsertions(BitCastInst &CI,
SmallVector<Value*, 8> Elements(DestVecTy->getNumElements());
if (!CollectInsertionElements(IntInput, 0, Elements,
DestVecTy->getElementType(), IC))
- return 0;
+ return nullptr;
// If we succeeded, we know that all of the element are specified by Elements
// or are zero if Elements has a null entry. Recast this as a set of
// insertions.
Value *Result = Constant::getNullValue(CI.getType());
for (unsigned i = 0, e = Elements.size(); i != e; ++i) {
- if (Elements[i] == 0) continue; // Unset element.
+ if (!Elements[i]) continue; // Unset element.
Result = IC.Builder->CreateInsertElement(Result, Elements[i],
IC.Builder->getInt32(i));
@@ -1716,14 +1719,14 @@ static Value *OptimizeIntegerToVectorInsertions(BitCastInst &CI,
/// bitcast. The various long double bitcasts can't get in here.
static Instruction *OptimizeIntToFloatBitCast(BitCastInst &CI,InstCombiner &IC){
// We need to know the target byte order to perform this optimization.
- if (!IC.getDataLayout()) return 0;
+ if (!IC.getDataLayout()) return nullptr;
Value *Src = CI.getOperand(0);
Type *DestTy = CI.getType();
// If this is a bitcast from int to float, check to see if the int is an
// extraction from a vector.
- Value *VecInput = 0;
+ Value *VecInput = nullptr;
// bitcast(trunc(bitcast(somevector)))
if (match(Src, m_Trunc(m_BitCast(m_Value(VecInput)))) &&
isa<VectorType>(VecInput->getType())) {
@@ -1747,7 +1750,7 @@ static Instruction *OptimizeIntToFloatBitCast(BitCastInst &CI,InstCombiner &IC){
}
// bitcast(trunc(lshr(bitcast(somevector), cst))
- ConstantInt *ShAmt = 0;
+ ConstantInt *ShAmt = nullptr;
if (match(Src, m_Trunc(m_LShr(m_BitCast(m_Value(VecInput)),
m_ConstantInt(ShAmt)))) &&
isa<VectorType>(VecInput->getType())) {
@@ -1769,7 +1772,7 @@ static Instruction *OptimizeIntToFloatBitCast(BitCastInst &CI,InstCombiner &IC){
return ExtractElementInst::Create(VecInput, IC.Builder->getInt32(Elt));
}
}
- return 0;
+ return nullptr;
}
Instruction *InstCombiner::visitBitCast(BitCastInst &CI) {
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-12 07:43:58 +0000