#include "llvm/Instructions.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Module.h"
+#include "llvm/Operator.h"
#include "llvm/Pass.h"
#include "llvm/Analysis/ConstantFolding.h"
#include "llvm/Analysis/MemoryBuiltins.h"
GS.HasPHIUser = true;
} else if (isa<CmpInst>(I)) {
GS.isCompared = true;
- } else if (isa<MemTransferInst>(I)) {
- const MemTransferInst *MTI = cast<MemTransferInst>(I);
+ } else if (const MemTransferInst *MTI = dyn_cast<MemTransferInst>(I)) {
+ if (MTI->isVolatile()) return true;
if (MTI->getArgOperand(0) == V)
GS.StoredType = GlobalStatus::isStored;
if (MTI->getArgOperand(1) == V)
GS.isLoaded = true;
- } else if (isa<MemSetInst>(I)) {
- assert(cast<MemSetInst>(I)->getArgOperand(0) == V &&
- "Memset only takes one pointer!");
+ } else if (const MemSetInst *MSI = dyn_cast<MemSetInst>(I)) {
+ assert(MSI->getArgOperand(0) == V && "Memset only takes one pointer!");
+ if (MSI->isVolatile()) return true;
GS.StoredType = GlobalStatus::isStored;
} else {
return true; // Any other non-load instruction might take address!
} else if (ConstantVector *CP = dyn_cast<ConstantVector>(Agg)) {
if (IdxV < CP->getNumOperands()) return CP->getOperand(IdxV);
} else if (isa<ConstantAggregateZero>(Agg)) {
- if (const StructType *STy = dyn_cast<StructType>(Agg->getType())) {
+ if (StructType *STy = dyn_cast<StructType>(Agg->getType())) {
if (IdxV < STy->getNumElements())
return Constant::getNullValue(STy->getElementType(IdxV));
- } else if (const SequentialType *STy =
+ } else if (SequentialType *STy =
dyn_cast<SequentialType>(Agg->getType())) {
return Constant::getNullValue(STy->getElementType());
}
} else if (isa<UndefValue>(Agg)) {
- if (const StructType *STy = dyn_cast<StructType>(Agg->getType())) {
+ if (StructType *STy = dyn_cast<StructType>(Agg->getType())) {
if (IdxV < STy->getNumElements())
return UndefValue::get(STy->getElementType(IdxV));
- } else if (const SequentialType *STy =
+ } else if (SequentialType *STy =
dyn_cast<SequentialType>(Agg->getType())) {
return UndefValue::get(STy->getElementType());
}
++GEPI; // Skip over the pointer index.
// If this is a use of an array allocation, do a bit more checking for sanity.
- if (
const ArrayType *AT = dyn_cast<ArrayType>(*GEPI)) {
+ if (ArrayType *AT = dyn_cast<ArrayType>(*GEPI)) {
uint64_t NumElements = AT->getNumElements();
ConstantInt *Idx = cast<ConstantInt>(U->getOperand(2));
GEPI != E;
++GEPI) {
uint64_t NumElements;
- if (
const ArrayType *SubArrayTy = dyn_cast<ArrayType>(*GEPI))
+ if (ArrayType *SubArrayTy = dyn_cast<ArrayType>(*GEPI))
NumElements = SubArrayTy->getNumElements();
- else if (const VectorType *SubVectorTy = dyn_cast<VectorType>(*GEPI))
+ else if (VectorType *SubVectorTy = dyn_cast<VectorType>(*GEPI))
NumElements = SubVectorTy->getNumElements();
else {
assert((*GEPI)->isStructTy() &&
assert(GV->hasLocalLinkage() && !GV->isConstant());
Constant *Init = GV->getInitializer();
- const Type *Ty = Init->getType();
+ Type *Ty = Init->getType();
std::vector<GlobalVariable*> NewGlobals;
Module::GlobalListType &Globals = GV->getParent()->getGlobalList();
if (StartAlignment == 0)
StartAlignment = TD.getABITypeAlignment(GV->getType());
- if (const StructType *STy = dyn_cast<StructType>(Ty)) {
+ if (StructType *STy = dyn_cast<StructType>(Ty)) {
NewGlobals.reserve(STy->getNumElements());
const StructLayout &Layout = *TD.getStructLayout(STy);
for (unsigned i = 0, e = STy->getNumElements(); i != e; ++i) {
if (NewAlign > TD.getABITypeAlignment(STy->getElementType(i)))
NGV->setAlignment(NewAlign);
}
- } else if (const SequentialType *STy = dyn_cast<SequentialType>(Ty)) {
+ } else if (SequentialType *STy = dyn_cast<SequentialType>(Ty)) {
unsigned NumElements = 0;
- if (
const ArrayType *ATy = dyn_cast<ArrayType>(STy))
+ if (ArrayType *ATy = dyn_cast<ArrayType>(STy))
NumElements = ATy->getNumElements();
else
NumElements = cast<VectorType>(STy)->getNumElements();
Idxs.push_back(NullInt);
for (unsigned i = 3, e = CE->getNumOperands(); i != e; ++i)
Idxs.push_back(CE->getOperand(i));
- NewPtr = ConstantExpr::getGetElementPtr(cast<Constant>(NewPtr),
- &Idxs[0], Idxs.size());
+ NewPtr = ConstantExpr::getGetElementPtr(cast<Constant>(NewPtr), Idxs);
} else {
GetElementPtrInst *GEPI = cast<GetElementPtrInst>(GEP);
SmallVector<Value*, 8> Idxs;
break;
if (Idxs.size() == GEPI->getNumOperands()-1)
Changed |= OptimizeAwayTrappingUsesOfValue(GEPI,
- ConstantExpr::getGetElementPtr(NewV, &Idxs[0],
- Idxs.size()));
+ ConstantExpr::getGetElementPtr(NewV, Idxs));
if (GEPI->use_empty()) {
Changed = true;
GEPI->eraseFromParent();
// If we get here we could have other crazy uses that are transitively
// loaded.
assert((isa<PHINode>(GlobalUser) || isa<SelectInst>(GlobalUser) ||
- isa<ConstantExpr>(GlobalUser)) && "Only expect load and stores!");
+ isa<ConstantExpr>(GlobalUser) || isa<CmpInst>(GlobalUser)) &&
+ "Only expect load and stores!");
}
}
/// malloc into a global, and any loads of GV as uses of the new global.
static GlobalVariable *OptimizeGlobalAddressOfMalloc(GlobalVariable *GV,
CallInst *CI,
- const Type *AllocTy,
+ Type *AllocTy,
ConstantInt *NElements,
TargetData* TD) {
DEBUG(errs() << "PROMOTING GLOBAL: " << *GV << " CALL = " << *CI << '\n');
- const Type *GlobalType;
+ Type *GlobalType;
if (NElements->getZExtValue() == 1)
GlobalType = AllocTy;
else
} else if (PHINode *PN = dyn_cast<PHINode>(V)) {
// PN's type is pointer to struct. Make a new PHI of pointer to struct
// field.
- const StructType *ST =
+ StructType *ST =
cast<StructType>(cast<PointerType>(PN->getType())->getElementType());
- Result =
+ PHINode *NewPN =
PHINode::Create(PointerType::getUnqual(ST->getElementType(FieldNo)),
+ PN->getNumIncomingValues(),
PN->getName()+".f"+Twine(FieldNo), PN);
+ Result = NewPN;
PHIsToRewrite.push_back(std::make_pair(PN, FieldNo));
} else {
llvm_unreachable("Unknown usable value");
// already been seen first by another load, so its uses have already been
// processed.
PHINode *PN = cast<PHINode>(LoadUser);
- bool Inserted;
- DenseMap<Value*, std::vector<Value*> >::iterator InsertPos;
- tie(InsertPos, Inserted) =
- InsertedScalarizedValues.insert(std::make_pair(PN, std::vector<Value*>()));
- if (!Inserted) return;
+ if (!InsertedScalarizedValues.insert(std::make_pair(PN,
+ std::vector<Value*>())).second)
+ return;
// If this is the first time we've seen this PHI, recursively process all
// users.
static GlobalVariable *PerformHeapAllocSRoA(GlobalVariable *GV, CallInst *CI,
Value* NElems, TargetData *TD) {
DEBUG(dbgs() << "SROA HEAP ALLOC: " << *GV << " MALLOC = " << *CI << '\n');
- const Type* MAT = getMallocAllocatedType(CI);
- const StructType *STy = cast<StructType>(MAT);
+ Type* MAT = getMallocAllocatedType(CI);
+ StructType *STy = cast<StructType>(MAT);
// There is guaranteed to be at least one use of the malloc (storing
// it into GV). If there are other uses, change them to be uses of
std::vector<Value*> FieldMallocs;
for (unsigned FieldNo = 0, e = STy->getNumElements(); FieldNo != e;++FieldNo){
- const Type *FieldTy = STy->getElementType(FieldNo);
- const PointerType *PFieldTy = PointerType::getUnqual(FieldTy);
+ Type *FieldTy = STy->getElementType(FieldNo);
+ PointerType *PFieldTy = PointerType::getUnqual(FieldTy);
GlobalVariable *NGV =
new GlobalVariable(*GV->getParent(),
FieldGlobals.push_back(NGV);
unsigned TypeSize = TD->getTypeAllocSize(FieldTy);
- if (const StructType *ST = dyn_cast<StructType>(FieldTy))
+ if (StructType *ST = dyn_cast<StructType>(FieldTy))
TypeSize = TD->getStructLayout(ST)->getSizeInBytes();
- const Type *IntPtrTy = TD->getIntPtrType(CI->getContext());
+ Type *IntPtrTy = TD->getIntPtrType(CI->getContext());
Value *NMI = CallInst::CreateMalloc(CI, IntPtrTy, FieldTy,
ConstantInt::get(IntPtrTy, TypeSize),
NElems, 0,
// Insert a store of null into each global.
for (unsigned i = 0, e = FieldGlobals.size(); i != e; ++i) {
-
const PointerType *PT = cast<PointerType>(FieldGlobals[i]->getType());
+ PointerType *PT = cast<PointerType>(FieldGlobals[i]->getType());
Constant *Null = Constant::getNullValue(PT->getElementType());
new StoreInst(Null, FieldGlobals[i], SI);
}
/// cast of malloc.
static bool TryToOptimizeStoreOfMallocToGlobal(GlobalVariable *GV,
CallInst *CI,
- const Type *AllocTy,
+ Type *AllocTy,
Module::global_iterator &GVI,
TargetData *TD) {
if (!TD)
// If this is an allocation of a fixed size array of structs, analyze as a
// variable size array. malloc [100 x struct],1 -> malloc struct, 100
if (NElems == ConstantInt::get(CI->getArgOperand(0)->getType(), 1))
- if (
const ArrayType *AT = dyn_cast<ArrayType>(AllocTy))
+ if (ArrayType *AT = dyn_cast<ArrayType>(AllocTy))
AllocTy = AT->getElementType();
- const StructType *AllocSTy = dyn_cast<StructType>(AllocTy);
+ StructType *AllocSTy = dyn_cast<StructType>(AllocTy);
if (!AllocSTy)
return false;
// If this is a fixed size array, transform the Malloc to be an alloc of
// structs. malloc [100 x struct],1 -> malloc struct, 100
- if (
const ArrayType *AT = dyn_cast<ArrayType>(getMallocAllocatedType(CI))) {
- const Type *IntPtrTy = TD->getIntPtrType(CI->getContext());
+ if (ArrayType *AT = dyn_cast<ArrayType>(getMallocAllocatedType(CI))) {
+ Type *IntPtrTy = TD->getIntPtrType(CI->getContext());
unsigned TypeSize = TD->getStructLayout(AllocSTy)->getSizeInBytes();
Value *AllocSize = ConstantInt::get(IntPtrTy, TypeSize);
Value *NumElements = ConstantInt::get(IntPtrTy, AT->getNumElements());
GV->getInitializer()->isNullValue()) {
if (Constant *SOVC = dyn_cast<Constant>(StoredOnceVal)) {
if (GV->getInitializer()->getType() != SOVC->getType())
- SOVC =
- ConstantExpr::getBitCast(SOVC, GV->getInitializer()->getType());
+ SOVC = ConstantExpr::getBitCast(SOVC, GV->getInitializer()->getType());
// Optimize away any trapping uses of the loaded value.
if (OptimizeAwayTrappingUsesOfLoads(GV, SOVC))
return true;
} else if (CallInst *CI = extractMallocCall(StoredOnceVal)) {
- const Type* MallocType = getMallocAllocatedType(CI);
+ Type* MallocType = getMallocAllocatedType(CI);
if (MallocType && TryToOptimizeStoreOfMallocToGlobal(GV, CI, MallocType,
GVI, TD))
return true;
/// can shrink the global into a boolean and select between the two values
/// whenever it is used. This exposes the values to other scalar optimizations.
static bool TryToShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal) {
- const Type *GVElType = GV->getType()->getElementType();
+ Type *GVElType = GV->getType()->getElementType();
// If GVElType is already i1, it is already shrunk. If the type of the GV is
// an FP value, pointer or vector, don't do this optimization because a select
DEBUG(dbgs() << "LOCALIZING GLOBAL: " << *GV);
Instruction& FirstI = const_cast<Instruction&>(*GS.AccessingFunction
->getEntryBlock().begin());
- const Type* ElemTy = GV->getType()->getElementType();
+ Type* ElemTy = GV->getType()->getElementType();
// FIXME: Pass Global's alignment when globals have alignment
AllocaInst* Alloca = new AllocaInst(ElemTy, NULL, GV->getName(), &FirstI);
if (!isa<UndefValue>(GV->getInitializer()))
return Changed;
}
-/// FindGlobalCtors - Find the llvm.globalctors list, verifying that all
+/// FindGlobalCtors - Find the llvm.global_ctors list, verifying that all
/// initializers have an init priority of 65535.
GlobalVariable *GlobalOpt::FindGlobalCtors(Module &M) {
GlobalVariable *GV = M.getGlobalVariable("llvm.global_ctors");
if (GV == 0) return 0;
- // Found it, verify it's an array of { int, void()* }.
- const ArrayType *ATy =dyn_cast<ArrayType>(GV->getType()->getElementType());
- if (!ATy) return 0;
- const StructType *STy = dyn_cast<StructType>(ATy->getElementType());
- if (!STy || STy->getNumElements() != 2 ||
- !STy->getElementType(0)->isIntegerTy(32)) return 0;
- const PointerType *PFTy = dyn_cast<PointerType>(STy->getElementType(1));
- if (!PFTy) return 0;
- const FunctionType *FTy = dyn_cast<FunctionType>(PFTy->getElementType());
- if (!FTy || !FTy->getReturnType()->isVoidTy() ||
- FTy->isVarArg() || FTy->getNumParams() != 0)
- return 0;
-
// Verify that the initializer is simple enough for us to handle. We are
// only allowed to optimize the initializer if it is unique.
if (!GV->hasUniqueInitializer()) return 0;
-
- ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer());
- if (!CA) return 0;
-
+
+ if (isa<ConstantAggregateZero>(GV->getInitializer()))
+ return GV;
+ ConstantArray *CA = cast<ConstantArray>(GV->getInitializer());
+
for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i) {
- ConstantStruct *CS = dyn_cast<ConstantStruct>(*i);
- if (CS == 0) return 0;
-
+ if (isa<ConstantAggregateZero>(*i))
+ continue;
+ ConstantStruct *CS = cast<ConstantStruct>(*i);
if (isa<ConstantPointerNull>(CS->getOperand(1)))
continue;
return 0;
// Init priority must be standard.
- ConstantInt *CI = dyn_cast<ConstantInt>(CS->getOperand(0));
- if (!CI || CI->getZExtValue() != 65535)
+ ConstantInt *CI = cast<ConstantInt>(CS->getOperand(0));
+ if (CI->getZExtValue() != 65535)
return 0;
}
/// ParseGlobalCtors - Given a llvm.global_ctors list that we can understand,
/// return a list of the functions and null terminator as a vector.
static std::vector<Function*> ParseGlobalCtors(GlobalVariable *GV) {
+ if (GV->getInitializer()->isNullValue())
+ return std::vector<Function*>();
ConstantArray *CA = cast<ConstantArray>(GV->getInitializer());
std::vector<Function*> Result;
Result.reserve(CA->getNumOperands());
static GlobalVariable *InstallGlobalCtors(GlobalVariable *GCL,
const std::vector<Function*> &Ctors) {
// If we made a change, reassemble the initializer list.
- std::vector<Constant*> CSVals;
- CSVals.push_back(ConstantInt::get(Type::getInt32Ty(GCL->getContext()),65535));
- CSVals.push_back(0);
+ Constant *CSVals[2];
+ CSVals[0] = ConstantInt::get(Type::getInt32Ty(GCL->getContext()), 65535);
+ CSVals[1] = 0;
+
+ StructType *StructTy =
+ cast <StructType>(
+ cast<ArrayType>(GCL->getType()->getElementType())->getElementType());
// Create the new init list.
std::vector<Constant*> CAList;
if (Ctors[i]) {
CSVals[1] = Ctors[i];
} else {
- const Type *FTy = FunctionType::get(Type::getVoidTy(GCL->getContext()),
+ Type *FTy = FunctionType::get(Type::getVoidTy(GCL->getContext()),
false);
- const PointerType *PFTy = PointerType::getUnqual(FTy);
+ PointerType *PFTy = PointerType::getUnqual(FTy);
CSVals[1] = Constant::getNullValue(PFTy);
CSVals[0] = ConstantInt::get(Type::getInt32Ty(GCL->getContext()),
- 2147483647);
+ 0x7fffffff);
}
- CAList.push_back(ConstantStruct::get(GCL->getContext(), CSVals, false));
+ CAList.push_back(ConstantStruct::get(StructTy, CSVals));
}
// Create the array initializer.
- const Type *StructTy =
- cast<ArrayType>(GCL->getType()->getElementType())->getElementType();
Constant *CA = ConstantArray::get(ArrayType::get(StructTy,
CAList.size()), CAList);
}
std::vector<Constant*> Elts;
- if (const StructType *STy = dyn_cast<StructType>(Init->getType())) {
+ if (StructType *STy = dyn_cast<StructType>(Init->getType())) {
// Break up the constant into its elements.
if (ConstantStruct *CS = dyn_cast<ConstantStruct>(Init)) {
Elts[Idx] = EvaluateStoreInto(Elts[Idx], Val, Addr, OpNo+1);
// Return the modified struct.
- return ConstantStruct::get(Init->getContext(), &Elts[0], Elts.size(),
- STy->isPacked());
- } else {
- ConstantInt *CI = cast<ConstantInt>(Addr->getOperand(OpNo));
- const SequentialType *InitTy = cast<SequentialType>(Init->getType());
-
- uint64_t NumElts;
- if (const ArrayType *ATy = dyn_cast<ArrayType>(InitTy))
- NumElts = ATy->getNumElements();
- else
- NumElts = cast<VectorType>(InitTy)->getNumElements();
-
+ return ConstantStruct::get(STy, Elts);
+ }
+
+ ConstantInt *CI = cast<ConstantInt>(Addr->getOperand(OpNo));
+ SequentialType *InitTy = cast<SequentialType>(Init->getType());
- // Break up the array into elements.
- if (ConstantArray *CA = dyn_cast<ConstantArray>(Init)) {
- for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i)
- Elts.push_back(cast<Constant>(*i));
- } else if (ConstantVector *CV = dyn_cast<ConstantVector>(Init)) {
- for (User::op_iterator i = CV->op_begin(), e = CV->op_end(); i != e; ++i)
- Elts.push_back(cast<Constant>(*i));
- } else if (isa<ConstantAggregateZero>(Init)) {
- Elts.assign(NumElts, Constant::getNullValue(InitTy->getElementType()));
- } else {
- assert(isa<UndefValue>(Init) && "This code is out of sync with "
- " ConstantFoldLoadThroughGEPConstantExpr");
- Elts.assign(NumElts, UndefValue::get(InitTy->getElementType()));
- }
+ uint64_t NumElts;
+ if (ArrayType *ATy = dyn_cast<ArrayType>(InitTy))
+ NumElts = ATy->getNumElements();
+ else
+ NumElts = cast<VectorType>(InitTy)->getNumElements();
+
+ // Break up the array into elements.
+ if (ConstantArray *CA = dyn_cast<ConstantArray>(Init)) {
+ for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i)
+ Elts.push_back(cast<Constant>(*i));
+ } else if (ConstantVector *CV = dyn_cast<ConstantVector>(Init)) {
+ for (User::op_iterator i = CV->op_begin(), e = CV->op_end(); i != e; ++i)
+ Elts.push_back(cast<Constant>(*i));
+ } else if (isa<ConstantAggregateZero>(Init)) {
+ Elts.assign(NumElts, Constant::getNullValue(InitTy->getElementType()));
+ } else {
+ assert(isa<UndefValue>(Init) && "This code is out of sync with "
+ " ConstantFoldLoadThroughGEPConstantExpr");
+ Elts.assign(NumElts, UndefValue::get(InitTy->getElementType()));
+ }
- assert(CI->getZExtValue() < NumElts);
- Elts[CI->getZExtValue()] =
- EvaluateStoreInto(Elts[CI->getZExtValue()], Val, Addr, OpNo+1);
+ assert(CI->getZExtValue() < NumElts);
+ Elts[CI->getZExtValue()] =
+ EvaluateStoreInto(Elts[CI->getZExtValue()], Val, Addr, OpNo+1);
- if (Init->getType()->isArrayTy())
- return ConstantArray::get(cast<ArrayType>(InitTy), Elts);
- return ConstantVector::get(Elts);
- }
+ if (Init->getType()->isArrayTy())
+ return ConstantArray::get(cast<ArrayType>(InitTy), Elts);
+ return ConstantVector::get(Elts);
}
/// CommitValueTo - We have decided that Addr (which satisfies the predicate
// stored value.
Ptr = CE->getOperand(0);
-
const Type *NewTy=cast<PointerType>(Ptr->getType())->getElementType();
+ Type *NewTy=cast<PointerType>(Ptr->getType())->getElementType();
// In order to push the bitcast onto the stored value, a bitcast
// from NewTy to Val's type must be legal. If it's not, we can try
// If NewTy is a struct, we can convert the pointer to the struct
// into a pointer to its first member.
// FIXME: This could be extended to support arrays as well.
- if (const StructType *STy = dyn_cast<StructType>(NewTy)) {
+ if (StructType *STy = dyn_cast<StructType>(NewTy)) {
NewTy = STy->getTypeAtIndex(0U);
- const IntegerType *IdxTy =IntegerType::get(NewTy->getContext(), 32);
+ IntegerType *IdxTy =IntegerType::get(NewTy->getContext(), 32);
Constant *IdxZero = ConstantInt::get(IdxTy, 0, false);
Constant * const IdxList[] = {IdxZero, IdxZero};
- Ptr = ConstantExpr::getGetElementPtr(Ptr, IdxList, 2);
+ Ptr = ConstantExpr::getGetElementPtr(Ptr, IdxList);
// If we can't improve the situation by introspecting NewTy,
// we have to give up.
for (User::op_iterator i = GEP->op_begin() + 1, e = GEP->op_end();
i != e; ++i)
GEPOps.push_back(getVal(Values, *i));
- InstResult = cast<GEPOperator>(GEP)->isInBounds() ?
- ConstantExpr::getInBoundsGetElementPtr(P, &GEPOps[0], GEPOps.size()) :
- ConstantExpr::getGetElementPtr(P, &GEPOps[0], GEPOps.size());
+ InstResult =
+ ConstantExpr::getGetElementPtr(P, GEPOps,
+ cast<GEPOperator>(GEP)->isInBounds());
} else if (LoadInst *LI = dyn_cast<LoadInst>(CurInst)) {
if (LI->isVolatile()) return false; // no volatile accesses.
InstResult = ComputeLoadResult(getVal(Values, LI->getOperand(0)),
if (InstResult == 0) return false; // Could not evaluate load.
} else if (AllocaInst *AI = dyn_cast<AllocaInst>(CurInst)) {
if (AI->isArrayAllocation()) return false; // Cannot handle array allocs.
- const Type *Ty = AI->getType()->getElementType();
+ Type *Ty = AI->getType()->getElementType();
AllocaTmps.push_back(new GlobalVariable(Ty, false,
GlobalValue::InternalLinkage,
UndefValue::get(Ty),
// Cannot handle inline asm.
if (isa<InlineAsm>(CI->getCalledValue())) return false;
+ if (MemSetInst *MSI = dyn_cast<MemSetInst>(CI)) {
+ if (MSI->isVolatile()) return false;
+ Constant *Ptr = getVal(Values, MSI->getDest());
+ Constant *Val = getVal(Values, MSI->getValue());
+ Constant *DestVal = ComputeLoadResult(getVal(Values, Ptr),
+ MutatedMemory);
+ if (Val->isNullValue() && DestVal && DestVal->isNullValue()) {
+ // This memset is a no-op.
+ ++CurInst;
+ continue;
+ }
+ return false;
+ }
+
// Resolve function pointers.
Function *Callee = dyn_cast<Function>(getVal(Values,
CI->getCalledValue()));
if (Callee->isDeclaration()) {
// If this is a function we can constant fold, do it.
- if (Constant *C = ConstantFoldCall(Callee, Formals.data(),
- Formals.size())) {
+ if (Constant *C = ConstantFoldCall(Callee, Formals)) {
InstResult = C;
} else {
return false;
if (!Fn)
return 0;
- const FunctionType *FTy = Fn->getFunctionType();
+ FunctionType *FTy = Fn->getFunctionType();
// Checking that the function has the right return type, the right number of
// parameters and that they all have pointer types should be enough.
static bool cxxDtorIsEmpty(const Function &Fn,
SmallPtrSet<const Function *, 8> &CalledFunctions) {
// FIXME: We could eliminate C++ destructors if they're readonly/readnone and
- // unwind, but that doesn't seem worth doing.
+ // nounwind, but that doesn't seem worth doing.
if (Fn.isDeclaration())
return false;
for (BasicBlock::const_iterator I = EntryBlock.begin(), E = EntryBlock.end();
I != E; ++I) {
if (const CallInst *CI = dyn_cast<CallInst>(I)) {
+ // Ignore debug intrinsics.
+ if (isa<DbgInfoIntrinsic>(CI))
+ continue;
+
const Function *CalledFn = CI->getCalledFunction();
if (!CalledFn)
return false;
+ SmallPtrSet<const Function *, 8> NewCalledFunctions(CalledFunctions);
+
// Don't treat recursive functions as empty.
- if (!CalledFunctions.insert(CalledFn))
+ if (!NewCalledFunctions.insert(CalledFn))
return false;
- if (!cxxDtorIsEmpty(*CalledFn, CalledFunctions))
+ if (!cxxDtorIsEmpty(*CalledFn, NewCalledFunctions))
return false;
} else if (isa<ReturnInst>(*I))
return true;
/// This registration, e.g. __cxa_atexit(f,p,d), is intended to cause the
/// call f(p) when DSO d is unloaded, before all such termination calls
/// registered before this one. It returns zero if registration is
- /// successful, nonzero on failure.
+ /// successful, nonzero on failure.
// This pass will look for calls to __cxa_atexit where the function is trivial
// and remove them.
for (Function::use_iterator I = CXAAtExitFn->use_begin(),
E = CXAAtExitFn->use_end(); I != E;) {
- CallSite CS(*I++);
- if (!CS)
- continue;
-
// We're only interested in calls. Theoretically, we could handle invoke
// instructions as well, but neither llvm-gcc nor clang generate invokes
// to __cxa_atexit.
- if (!CS.isCall())
+ CallInst *CI = dyn_cast<CallInst>(*I++);
+ if (!CI)
continue;
Function *DtorFn =
- dyn_cast<Function>(CS.getArgument(0)->stripPointerCasts());
+ dyn_cast<Function>(CI->getArgOperand(0)->stripPointerCasts());
if (!DtorFn)
continue;
continue;
// Just remove the call.
- CS->replaceAllUsesWith(Constant::getNullValue(CS.getType()));
- CS->eraseFromParent();
+ CI->replaceAllUsesWith(Constant::getNullValue(CI->getType()));
+ CI->eraseFromParent();
++NumCXXDtorsRemoved;
projects / oota-llvm.git / blobdiff