unsigned Value::getPointerDereferenceableBytes(bool &CanBeNull) const {
assert(getType()->isPointerTy() && "must be pointer");
unsigned DerefBytes = 0;
CanBeNull = false;
if (const Argument *A = dyn_cast<Argument>(this)) {
DerefBytes = A->getDereferenceableBytes();
if (DerefBytes == 0) {
DerefBytes = A->getDereferenceableOrNullBytes();
CanBeNull = true;
}
} else if (auto CS = ImmutableCallSite(this)) {
DerefBytes = CS.getDereferenceableBytes(0);
if (DerefBytes == 0) {
DerefBytes = CS.getDereferenceableOrNullBytes(0);
CanBeNull = true;
}
} else if (const LoadInst *LI = dyn_cast<LoadInst>(this)) {
if (MDNode *MD = LI->getMetadata(LLVMContext::MD_dereferenceable)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
DerefBytes = CI->getLimitedValue();
}
if (DerefBytes == 0) {
if (MDNode *MD =
LI->getMetadata(LLVMContext::MD_dereferenceable_or_null)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
DerefBytes = CI->getLimitedValue();
}
CanBeNull = true;
}
}
return DerefBytes;
}
uint64_t Value::getPointerDereferenceableBytes(const DataLayout &DL,
bool &CanBeNull) const {
assert(getType()->isPointerTy() && "must be pointer");
uint64_t DerefBytes = 0;
CanBeNull = false;
if (const Argument *A = dyn_cast<Argument>(this)) {
DerefBytes = A->getDereferenceableBytes();
if (DerefBytes == 0 && (A->hasByValAttr() || A->hasStructRetAttr())) {
Type *PT = cast<PointerType>(A->getType())->getElementType();
if (PT->isSized())
DerefBytes = DL.getTypeStoreSize(PT);
}
if (DerefBytes == 0) {
DerefBytes = A->getDereferenceableOrNullBytes();
CanBeNull = true;
}
} else if (auto CS = ImmutableCallSite(this)) {
DerefBytes = CS.getDereferenceableBytes(AttributeList::ReturnIndex);
if (DerefBytes == 0) {
DerefBytes = CS.getDereferenceableOrNullBytes(AttributeList::ReturnIndex);
CanBeNull = true;
}
} else if (const LoadInst *LI = dyn_cast<LoadInst>(this)) {
if (MDNode *MD = LI->getMetadata(LLVMContext::MD_dereferenceable)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
DerefBytes = CI->getLimitedValue();
}
if (DerefBytes == 0) {
if (MDNode *MD =
LI->getMetadata(LLVMContext::MD_dereferenceable_or_null)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
DerefBytes = CI->getLimitedValue();
}
CanBeNull = true;
}
} else if (auto *AI = dyn_cast<AllocaInst>(this)) {
if (!AI->isArrayAllocation()) {
DerefBytes = DL.getTypeStoreSize(AI->getAllocatedType());
CanBeNull = false;
}
} else if (auto *GV = dyn_cast<GlobalVariable>(this)) {
if (GV->getValueType()->isSized() && !GV->hasExternalWeakLinkage()) {
// TODO: Don't outright reject hasExternalWeakLinkage but set the
// CanBeNull flag.
DerefBytes = DL.getTypeStoreSize(GV->getValueType());
CanBeNull = false;
}
}
return DerefBytes;
}
// Propagate existing explicit probabilities from either profile data or
// 'expect' intrinsic processing.
bool BranchProbabilityAnalysis::calcMetadataWeights(BasicBlock *BB) {
TerminatorInst *TI = BB->getTerminator();
if (TI->getNumSuccessors() == 1)
return false;
if (!isa<BranchInst>(TI) && !isa<SwitchInst>(TI))
return false;
MDNode *WeightsNode = TI->getMetadata(LLVMContext::MD_prof);
if (!WeightsNode)
return false;
// Ensure there are weights for all of the successors. Note that the first
// operand to the metadata node is a name, not a weight.
if (WeightsNode->getNumOperands() != TI->getNumSuccessors() + 1)
return false;
// Build up the final weights that will be used in a temporary buffer, but
// don't add them until all weihts are present. Each weight value is clamped
// to [1, getMaxWeightFor(BB)].
uint32_t WeightLimit = getMaxWeightFor(BB);
SmallVector<uint32_t, 2> Weights;
Weights.reserve(TI->getNumSuccessors());
for (unsigned i = 1, e = WeightsNode->getNumOperands(); i != e; ++i) {
ConstantInt *Weight = dyn_cast<ConstantInt>(WeightsNode->getOperand(i));
if (!Weight)
return false;
Weights.push_back(
std::max<uint32_t>(1, Weight->getLimitedValue(WeightLimit)));
}
assert(Weights.size() == TI->getNumSuccessors() && "Checked above");
for (unsigned i = 0, e = TI->getNumSuccessors(); i != e; ++i)
BP->setEdgeWeight(BB, TI->getSuccessor(i), Weights[i]);
return true;
}
CSDFMoC* IRParser::parseCSDF(MDNode* csdfNode){
CSDFMoC* csfMoC;
//Get number of phases
ConstantInt* value = cast<ConstantInt>(csdfNode->getOperand(0));
int phasesNb = value->getValue().getLimitedValue();
if (phasesNb == 1){
csfMoC = new SDFMoC(actor);
}else{
csfMoC = new CSDFMoC(actor);
}
// Parse patterns
Pattern* ip = parsePattern(inputs, csdfNode->getOperand(1));
Pattern* op = parsePattern(outputs, csdfNode->getOperand(2));
csfMoC->setInputPattern(ip);
csfMoC->setOutputPattern(op);
csfMoC->setNumberOfPhases(value->getLimitedValue());
// Parse actions
parseCSDFActions(cast<MDNode>(csdfNode->getOperand(3)), csfMoC);
return csfMoC;
}
Type* IRParser::parseType(MDNode* node){
//Get size of the element
ConstantInt* typeSize = cast<ConstantInt>(node->getOperand(0));
Type* type = (Type*)IntegerType::get(Context, typeSize->getLimitedValue());
Value* val = node->getNumOperands() > 1 ? node->getOperand(1) : NULL;
//if operand 2 is not null, the element is a list
if (val != NULL){
for (unsigned i = 1 ; i != node->getNumOperands(); ++i){
ConstantInt* size = cast<ConstantInt>(val);
type = ArrayType::get(type, size->getLimitedValue());
}
}
return type;
}
static bool isDereferenceableFromAttribute(const Value *BV, APInt Offset,
Type *Ty, const DataLayout &DL,
const Instruction *CtxI,
const DominatorTree *DT,
const TargetLibraryInfo *TLI) {
assert(Offset.isNonNegative() && "offset can't be negative");
assert(Ty->isSized() && "must be sized");
APInt DerefBytes(Offset.getBitWidth(), 0);
bool CheckForNonNull = false;
if (const Argument *A = dyn_cast<Argument>(BV)) {
DerefBytes = A->getDereferenceableBytes();
if (!DerefBytes.getBoolValue()) {
DerefBytes = A->getDereferenceableOrNullBytes();
CheckForNonNull = true;
}
} else if (auto CS = ImmutableCallSite(BV)) {
DerefBytes = CS.getDereferenceableBytes(0);
if (!DerefBytes.getBoolValue()) {
DerefBytes = CS.getDereferenceableOrNullBytes(0);
CheckForNonNull = true;
}
} else if (const LoadInst *LI = dyn_cast<LoadInst>(BV)) {
if (MDNode *MD = LI->getMetadata(LLVMContext::MD_dereferenceable)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
DerefBytes = CI->getLimitedValue();
}
if (!DerefBytes.getBoolValue()) {
if (MDNode *MD =
LI->getMetadata(LLVMContext::MD_dereferenceable_or_null)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
DerefBytes = CI->getLimitedValue();
}
CheckForNonNull = true;
}
}
if (DerefBytes.getBoolValue())
if (DerefBytes.uge(Offset + DL.getTypeStoreSize(Ty)))
if (!CheckForNonNull || isKnownNonNullAt(BV, CtxI, DT, TLI))
return true;
return false;
}
void AssertionSiteInstrumenter::ParseAssertionLocation(
Location *Loc, CallInst *Call) {
assert(Call->getCalledFunction()->getName() == INLINE_ASSERTION);
if (Call->getNumArgOperands() < 4)
panic("TESLA assertion must have at least 4 arguments");
// The filename (argument 1) should be a global variable.
GlobalVariable *NameVar =
dyn_cast<GlobalVariable>(Call->getOperand(1)->stripPointerCasts());
ConstantDataArray *A;
if (!NameVar ||
!(A = dyn_cast_or_null<ConstantDataArray>(NameVar->getInitializer()))) {
Call->dump();
panic("unable to parse filename from TESLA assertion");
}
*Loc->mutable_filename() = A->getAsString();
// The line and counter values should be constant integers.
ConstantInt *Line = dyn_cast<ConstantInt>(Call->getOperand(2));
if (!Line) {
Call->getOperand(2)->dump();
panic("assertion line must be a constant int");
}
Loc->set_line(Line->getLimitedValue(INT_MAX));
ConstantInt *Count = dyn_cast<ConstantInt>(Call->getOperand(3));
if (!Count) {
Call->getOperand(3)->dump();
panic("assertion count must be a constant int");
}
Loc->set_counter(Count->getLimitedValue(INT_MAX));
}
unsigned Value::getPointerAlignment(const DataLayout &DL) const {
assert(getType()->isPointerTy() && "must be pointer");
unsigned Align = 0;
if (auto *GO = dyn_cast<GlobalObject>(this)) {
// Don't make any assumptions about function pointer alignment. Some
// targets use the LSBs to store additional information.
if (isa<Function>(GO))
return 0;
Align = GO->getAlignment();
if (Align == 0) {
if (auto *GVar = dyn_cast<GlobalVariable>(GO)) {
Type *ObjectType = GVar->getValueType();
if (ObjectType->isSized()) {
// If the object is defined in the current Module, we'll be giving
// it the preferred alignment. Otherwise, we have to assume that it
// may only have the minimum ABI alignment.
if (GVar->isStrongDefinitionForLinker())
Align = DL.getPreferredAlignment(GVar);
else
Align = DL.getABITypeAlignment(ObjectType);
}
}
}
} else if (const Argument *A = dyn_cast<Argument>(this)) {
Align = A->getParamAlignment();
if (!Align && A->hasStructRetAttr()) {
// An sret parameter has at least the ABI alignment of the return type.
Type *EltTy = cast<PointerType>(A->getType())->getElementType();
if (EltTy->isSized())
Align = DL.getABITypeAlignment(EltTy);
}
} else if (const AllocaInst *AI = dyn_cast<AllocaInst>(this)) {
Align = AI->getAlignment();
if (Align == 0) {
Type *AllocatedType = AI->getAllocatedType();
if (AllocatedType->isSized())
Align = DL.getPrefTypeAlignment(AllocatedType);
}
} else if (auto CS = ImmutableCallSite(this))
Align = CS.getAttributes().getRetAlignment();
else if (const LoadInst *LI = dyn_cast<LoadInst>(this))
if (MDNode *MD = LI->getMetadata(LLVMContext::MD_align)) {
ConstantInt *CI = mdconst::extract<ConstantInt>(MD->getOperand(0));
Align = CI->getLimitedValue();
}
return Align;
}
bool CallingConvention_x86_64_systemv::analyzeFunction(ParameterRegistry ®istry, CallInformation &callInfo, Function &function)
{
// TODO: Look at called functions to find hidden parameters/return values
if (md::isPrototype(function))
{
return false;
}
TargetInfo& targetInfo = registry.getTargetInfo();
// We always need rip and rsp.
callInfo.addParameter(ValueInformation::IntegerRegister, targetInfo.registerNamed("rip"));
callInfo.addParameter(ValueInformation::IntegerRegister, targetInfo.registerNamed("rsp"));
// Identify register GEPs.
// (assume x86 regs as first parameter)
assert(function.arg_size() == 1);
Argument* regs = function.arg_begin();
auto pointerType = dyn_cast<PointerType>(regs->getType());
assert(pointerType != nullptr && pointerType->getTypeAtIndex(int(0))->getStructName() == "struct.x86_regs");
unordered_multimap<const TargetRegisterInfo*, GetElementPtrInst*> geps;
for (auto& use : regs->uses())
{
if (GetElementPtrInst* gep = dyn_cast<GetElementPtrInst>(use.getUser()))
if (const TargetRegisterInfo* regName = targetInfo.registerInfo(*gep))
{
geps.insert({regName, gep});
}
}
// Look at temporary registers that are read before they are written
MemorySSA& mssa = *registry.getMemorySSA(function);
for (const char* name : parameterRegisters)
{
const TargetRegisterInfo* smallReg = targetInfo.registerNamed(name);
const TargetRegisterInfo* regInfo = targetInfo.largestOverlappingRegister(*smallReg);
auto range = geps.equal_range(regInfo);
vector<Instruction*> addresses;
for (auto iter = range.first; iter != range.second; ++iter)
{
addresses.push_back(iter->second);
}
for (size_t i = 0; i < addresses.size(); ++i)
{
Instruction* addressInst = addresses[i];
for (auto& use : addressInst->uses())
{
if (auto load = dyn_cast<LoadInst>(use.getUser()))
{
MemoryAccess* parent = mssa.getMemoryAccess(load)->getDefiningAccess();
if (mssa.isLiveOnEntryDef(parent))
{
// register argument!
callInfo.addParameter(ValueInformation::IntegerRegister, regInfo);
}
}
else if (auto cast = dyn_cast<CastInst>(use.getUser()))
{
if (cast->getType()->isPointerTy())
{
addresses.push_back(cast);
}
}
}
}
}
// Does the function refer to values at an offset above the initial rsp value?
// Assume that rsp is known to be preserved.
auto spRange = geps.equal_range(targetInfo.getStackPointer());
for (auto iter = spRange.first; iter != spRange.second; ++iter)
{
auto* gep = iter->second;
// Find all uses of reference to sp register
for (auto& use : gep->uses())
{
if (auto load = dyn_cast<LoadInst>(use.getUser()))
{
// Find uses above +8 (since +0 is the return address)
for (auto& use : load->uses())
{
ConstantInt* offset = nullptr;
if (match(use.get(), m_Add(m_Value(), m_ConstantInt(offset))))
{
make_signed<decltype(offset->getLimitedValue())>::type intOffset = offset->getLimitedValue();
if (intOffset > 8)
{
// memory argument!
callInfo.addParameter(ValueInformation::Stack, intOffset);
}
}
}
}
}
}
// Are we using return registers?
vector<const TargetRegisterInfo*> usedReturns;
usedReturns.reserve(2);
for (const char* name : returnRegisters)
{
const TargetRegisterInfo* regInfo = targetInfo.registerNamed(name);
auto range = geps.equal_range(regInfo);
for (auto iter = range.first; iter != range.second; ++iter)
{
bool hasStore = any_of(iter->second->use_begin(), iter->second->use_end(), [](Use& use)
{
return isa<StoreInst>(use.getUser());
});
if (hasStore)
{
usedReturns.push_back(regInfo);
break;
}
}
}
for (const TargetRegisterInfo* reg : ipaFindUsedReturns(registry, function, usedReturns))
{
// return value!
callInfo.addReturn(ValueInformation::IntegerRegister, reg);
}
return true;
}
//
// Method: runOnModule()
//
// Description:
// Entry point for this LLVM pass.
// Find all GEPs, and simplify them.
//
// Inputs:
// M - A reference to the LLVM module to transform
//
// Outputs:
// M - The transformed LLVM module.
//
// Return value:
// true - The module was modified.
// false - The module was not modified.
//
bool SimplifyGEP::runOnModule(Module& M) {
TD = &getAnalysis<TargetData>();
preprocess(M);
for (Module::iterator F = M.begin(); F != M.end(); ++F){
for (Function::iterator B = F->begin(), FE = F->end(); B != FE; ++B) {
for (BasicBlock::iterator I = B->begin(), BE = B->end(); I != BE; I++) {
if(!(isa<GetElementPtrInst>(I)))
continue;
GetElementPtrInst *GEP = cast<GetElementPtrInst>(I);
Value *PtrOp = GEP->getOperand(0);
Value *StrippedPtr = PtrOp->stripPointerCasts();
// Check if the GEP base pointer is enclosed in a cast
if (StrippedPtr != PtrOp) {
const PointerType *StrippedPtrTy =cast<PointerType>(StrippedPtr->getType());
bool HasZeroPointerIndex = false;
if (ConstantInt *C = dyn_cast<ConstantInt>(GEP->getOperand(1)))
HasZeroPointerIndex = C->isZero();
// Transform: GEP (bitcast [10 x i8]* X to [0 x i8]*), i32 0, ...
// into : GEP [10 x i8]* X, i32 0, ...
//
// Likewise, transform: GEP (bitcast i8* X to [0 x i8]*), i32 0, ...
// into : GEP i8* X, ...
//
// This occurs when the program declares an array extern like "int X[];"
if (HasZeroPointerIndex) {
const PointerType *CPTy = cast<PointerType>(PtrOp->getType());
if (const ArrayType *CATy =
dyn_cast<ArrayType>(CPTy->getElementType())) {
// GEP (bitcast i8* X to [0 x i8]*), i32 0, ... ?
if (CATy->getElementType() == StrippedPtrTy->getElementType()) {
// -> GEP i8* X, ...
SmallVector<Value*, 8> Idx(GEP->idx_begin()+1, GEP->idx_end());
GetElementPtrInst *Res =
GetElementPtrInst::Create(StrippedPtr, Idx, GEP->getName(), GEP);
Res->setIsInBounds(GEP->isInBounds());
GEP->replaceAllUsesWith(Res);
continue;
}
if (const ArrayType *XATy =
dyn_cast<ArrayType>(StrippedPtrTy->getElementType())){
// GEP (bitcast [10 x i8]* X to [0 x i8]*), i32 0, ... ?
if (CATy->getElementType() == XATy->getElementType()) {
// -> GEP [10 x i8]* X, i32 0, ...
// At this point, we know that the cast source type is a pointer
// to an array of the same type as the destination pointer
// array. Because the array type is never stepped over (there
// is a leading zero) we can fold the cast into this GEP.
GEP->setOperand(0, StrippedPtr);
continue;
}
}
}
} else if (GEP->getNumOperands() == 2) {
// Transform things like:
// %t = getelementptr i32* bitcast ([2 x i32]* %str to i32*), i32 %V
// into: %t1 = getelementptr [2 x i32]* %str, i32 0, i32 %V; bitcast
Type *SrcElTy = StrippedPtrTy->getElementType();
Type *ResElTy=cast<PointerType>(PtrOp->getType())->getElementType();
if (TD && SrcElTy->isArrayTy() &&
TD->getTypeAllocSize(cast<ArrayType>(SrcElTy)->getElementType()) ==
TD->getTypeAllocSize(ResElTy)) {
Value *Idx[2];
Idx[0] = Constant::getNullValue(Type::getInt32Ty(GEP->getContext()));
Idx[1] = GEP->getOperand(1);
Value *NewGEP = GetElementPtrInst::Create(StrippedPtr, Idx,
GEP->getName(), GEP);
// V and GEP are both pointer types --> BitCast
GEP->replaceAllUsesWith(new BitCastInst(NewGEP, GEP->getType(), GEP->getName(), GEP));
continue;
}
// Transform things like:
// getelementptr i8* bitcast ([100 x double]* X to i8*), i32 %tmp
// (where tmp = 8*tmp2) into:
// getelementptr [100 x double]* %arr, i32 0, i32 %tmp2; bitcast
if (TD && SrcElTy->isArrayTy() && ResElTy->isIntegerTy(8)) {
uint64_t ArrayEltSize =
TD->getTypeAllocSize(cast<ArrayType>(SrcElTy)->getElementType());
// Check to see if "tmp" is a scale by a multiple of ArrayEltSize. We
// allow either a mul, shift, or constant here.
Value *NewIdx = 0;
ConstantInt *Scale = 0;
if (ArrayEltSize == 1) {
NewIdx = GEP->getOperand(1);
Scale = ConstantInt::get(cast<IntegerType>(NewIdx->getType()), 1);
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(GEP->getOperand(1))) {
NewIdx = ConstantInt::get(CI->getType(), 1);
Scale = CI;
} else if (Instruction *Inst =dyn_cast<Instruction>(GEP->getOperand(1))){
if (Inst->getOpcode() == Instruction::Shl &&
isa<ConstantInt>(Inst->getOperand(1))) {
ConstantInt *ShAmt = cast<ConstantInt>(Inst->getOperand(1));
uint32_t ShAmtVal = ShAmt->getLimitedValue(64);
Scale = ConstantInt::get(cast<IntegerType>(Inst->getType()),
1ULL << ShAmtVal);
NewIdx = Inst->getOperand(0);
} else if (Inst->getOpcode() == Instruction::Mul &&
isa<ConstantInt>(Inst->getOperand(1))) {
Scale = cast<ConstantInt>(Inst->getOperand(1));
NewIdx = Inst->getOperand(0);
}
}
// If the index will be to exactly the right offset with the scale taken
// out, perform the transformation. Note, we don't know whether Scale is
// signed or not. We'll use unsigned version of division/modulo
// operation after making sure Scale doesn't have the sign bit set.
if (ArrayEltSize && Scale && Scale->getSExtValue() >= 0LL &&
Scale->getZExtValue() % ArrayEltSize == 0) {
Scale = ConstantInt::get(Scale->getType(),
Scale->getZExtValue() / ArrayEltSize);
if (Scale->getZExtValue() != 1) {
Constant *C = ConstantExpr::getIntegerCast(Scale, NewIdx->getType(),
false /*ZExt*/);
NewIdx = BinaryOperator::Create(BinaryOperator::Mul, NewIdx, C, "idxscale");
}
// Insert the new GEP instruction.
Value *Idx[2];
Idx[0] = Constant::getNullValue(Type::getInt32Ty(GEP->getContext()));
Idx[1] = NewIdx;
Value *NewGEP = GetElementPtrInst::Create(StrippedPtr, Idx,
GEP->getName(), GEP);
GEP->replaceAllUsesWith(new BitCastInst(NewGEP, GEP->getType(), GEP->getName(), GEP));
continue;
}
}
}
}
}
}
}
return true;
}
/// Return true if we can evaluate the specified expression tree if the vector
/// elements were shuffled in a different order.
static bool CanEvaluateShuffled(Value *V, ArrayRef<int> Mask,
unsigned Depth = 5) {
// We can always reorder the elements of a constant.
if (isa<Constant>(V))
return true;
// We won't reorder vector arguments. No IPO here.
Instruction *I = dyn_cast<Instruction>(V);
if (!I) return false;
// Two users may expect different orders of the elements. Don't try it.
if (!I->hasOneUse())
return false;
if (Depth == 0) return false;
switch (I->getOpcode()) {
case Instruction::Add:
case Instruction::FAdd:
case Instruction::Sub:
case Instruction::FSub:
case Instruction::Mul:
case Instruction::FMul:
case Instruction::UDiv:
case Instruction::SDiv:
case Instruction::FDiv:
case Instruction::URem:
case Instruction::SRem:
case Instruction::FRem:
case Instruction::Shl:
case Instruction::LShr:
case Instruction::AShr:
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
case Instruction::ICmp:
case Instruction::FCmp:
case Instruction::Trunc:
case Instruction::ZExt:
case Instruction::SExt:
case Instruction::FPToUI:
case Instruction::FPToSI:
case Instruction::UIToFP:
case Instruction::SIToFP:
case Instruction::FPTrunc:
case Instruction::FPExt:
case Instruction::GetElementPtr: {
for (int i = 0, e = I->getNumOperands(); i != e; ++i) {
if (!CanEvaluateShuffled(I->getOperand(i), Mask, Depth-1))
return false;
}
return true;
}
case Instruction::InsertElement: {
ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(2));
if (!CI) return false;
int ElementNumber = CI->getLimitedValue();
// Verify that 'CI' does not occur twice in Mask. A single 'insertelement'
// can't put an element into multiple indices.
bool SeenOnce = false;
for (int i = 0, e = Mask.size(); i != e; ++i) {
if (Mask[i] == ElementNumber) {
if (SeenOnce)
return false;
SeenOnce = true;
}
}
return CanEvaluateShuffled(I->getOperand(0), Mask, Depth-1);
}
}
return false;
}
/// CanEvaluateShifted - See if we can compute the specified value, but shifted
/// logically to the left or right by some number of bits. This should return
/// true if the expression can be computed for the same cost as the current
/// expression tree. This is used to eliminate extraneous shifting from things
/// like:
/// %C = shl i128 %A, 64
/// %D = shl i128 %B, 96
/// %E = or i128 %C, %D
/// %F = lshr i128 %E, 64
/// where the client will ask if E can be computed shifted right by 64-bits. If
/// this succeeds, the GetShiftedValue function will be called to produce the
/// value.
static bool CanEvaluateShifted(Value *V, unsigned NumBits, bool isLeftShift,
InstCombiner &IC) {
// We can always evaluate constants shifted.
if (isa<Constant>(V))
return true;
Instruction *I = dyn_cast<Instruction>(V);
if (!I) return false;
// If this is the opposite shift, we can directly reuse the input of the shift
// if the needed bits are already zero in the input. This allows us to reuse
// the value which means that we don't care if the shift has multiple uses.
// TODO: Handle opposite shift by exact value.
ConstantInt *CI = nullptr;
if ((isLeftShift && match(I, m_LShr(m_Value(), m_ConstantInt(CI)))) ||
(!isLeftShift && match(I, m_Shl(m_Value(), m_ConstantInt(CI))))) {
if (CI->getZExtValue() == NumBits) {
// TODO: Check that the input bits are already zero with MaskedValueIsZero
#if 0
// If this is a truncate of a logical shr, we can truncate it to a smaller
// lshr iff we know that the bits we would otherwise be shifting in are
// already zeros.
uint32_t OrigBitWidth = OrigTy->getScalarSizeInBits();
uint32_t BitWidth = Ty->getScalarSizeInBits();
if (MaskedValueIsZero(I->getOperand(0),
APInt::getHighBitsSet(OrigBitWidth, OrigBitWidth-BitWidth)) &&
CI->getLimitedValue(BitWidth) < BitWidth) {
return CanEvaluateTruncated(I->getOperand(0), Ty);
}
#endif
}
}
// We can't mutate something that has multiple uses: doing so would
// require duplicating the instruction in general, which isn't profitable.
if (!I->hasOneUse()) return false;
switch (I->getOpcode()) {
default: return false;
case Instruction::And:
case Instruction::Or:
case Instruction::Xor:
// Bitwise operators can all arbitrarily be arbitrarily evaluated shifted.
return CanEvaluateShifted(I->getOperand(0), NumBits, isLeftShift, IC) &&
CanEvaluateShifted(I->getOperand(1), NumBits, isLeftShift, IC);
case Instruction::Shl: {
// We can often fold the shift into shifts-by-a-constant.
CI = dyn_cast<ConstantInt>(I->getOperand(1));
if (!CI) return false;
// We can always fold shl(c1)+shl(c2) -> shl(c1+c2).
if (isLeftShift) return true;
// We can always turn shl(c)+shr(c) -> and(c2).
if (CI->getValue() == NumBits) return true;
unsigned TypeWidth = I->getType()->getScalarSizeInBits();
// We can turn shl(c1)+shr(c2) -> shl(c3)+and(c4), but it isn't
// profitable unless we know the and'd out bits are already zero.
if (CI->getZExtValue() > NumBits) {
unsigned LowBits = TypeWidth - CI->getZExtValue();
if (MaskedValueIsZero(I->getOperand(0),
APInt::getLowBitsSet(TypeWidth, NumBits) << LowBits))
return true;
}
return false;
}
case Instruction::LShr: {
// We can often fold the shift into shifts-by-a-constant.
CI = dyn_cast<ConstantInt>(I->getOperand(1));
if (!CI) return false;
// We can always fold lshr(c1)+lshr(c2) -> lshr(c1+c2).
if (!isLeftShift) return true;
// We can always turn lshr(c)+shl(c) -> and(c2).
if (CI->getValue() == NumBits) return true;
unsigned TypeWidth = I->getType()->getScalarSizeInBits();
// We can always turn lshr(c1)+shl(c2) -> lshr(c3)+and(c4), but it isn't
// profitable unless we know the and'd out bits are already zero.
if (CI->getValue().ult(TypeWidth) && CI->getZExtValue() > NumBits) {
unsigned LowBits = CI->getZExtValue() - NumBits;
if (MaskedValueIsZero(I->getOperand(0),
APInt::getLowBitsSet(TypeWidth, NumBits) << LowBits))
return true;
}
return false;
}
case Instruction::Select: {
SelectInst *SI = cast<SelectInst>(I);
return CanEvaluateShifted(SI->getTrueValue(), NumBits, isLeftShift, IC) &&
CanEvaluateShifted(SI->getFalseValue(), NumBits, isLeftShift, IC);
}
case Instruction::PHI: {
// We can change a phi if we can change all operands. Note that we never
// get into trouble with cyclic PHIs here because we only consider
// instructions with a single use.
PHINode *PN = cast<PHINode>(I);
for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i)
if (!CanEvaluateShifted(PN->getIncomingValue(i), NumBits, isLeftShift,IC))
return false;
return true;
}
}
}
/// PrepareMonoLSDA - Collect information needed by EmitMonoLSDA
///
/// This function collects information available only during EndFunction which is needed
/// by EmitMonoLSDA and stores it into EHFrameInfo. It is the same as the
/// beginning of EmitExceptionTable.
///
void DwarfMonoException::PrepareMonoLSDA(FunctionEHFrameInfo *EHFrameInfo) {
const std::vector<const GlobalVariable *> &TypeInfos = MMI->getTypeInfos();
const std::vector<LandingPadInfo> &PadInfos = MMI->getLandingPads();
const MachineFunction *MF = Asm->MF;
// Sort the landing pads in order of their type ids. This is used to fold
// duplicate actions.
SmallVector<const LandingPadInfo *, 64> LandingPads;
LandingPads.reserve(PadInfos.size());
for (unsigned i = 0, N = PadInfos.size(); i != N; ++i)
LandingPads.push_back(&PadInfos[i]);
std::sort(LandingPads.begin(), LandingPads.end(),
[](const LandingPadInfo *L,
const LandingPadInfo *R) { return L->TypeIds < R->TypeIds; });
// Invokes and nounwind calls have entries in PadMap (due to being bracketed
// by try-range labels when lowered). Ordinary calls do not, so appropriate
// try-ranges for them need be deduced when using DWARF exception handling.
RangeMapType PadMap;
for (unsigned i = 0, N = LandingPads.size(); i != N; ++i) {
const LandingPadInfo *LandingPad = LandingPads[i];
for (unsigned j = 0, E = LandingPad->BeginLabels.size(); j != E; ++j) {
MCSymbol *BeginLabel = LandingPad->BeginLabels[j];
assert(!PadMap.count(BeginLabel) && "Duplicate landing pad labels!");
PadRange P = { i, j };
PadMap[BeginLabel] = P;
}
}
// Compute the call-site table.
SmallVector<MonoCallSiteEntry, 64> CallSites;
MCSymbol *LastLabel = 0;
for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
I != E; ++I) {
for (MachineBasicBlock::const_iterator MI = I->begin(), E = I->end();
MI != E; ++MI) {
if (!MI->isLabel()) {
continue;
}
MCSymbol *BeginLabel = MI->getOperand(0).getMCSymbol();
assert(BeginLabel && "Invalid label!");
RangeMapType::iterator L = PadMap.find(BeginLabel);
if (L == PadMap.end())
continue;
PadRange P = L->second;
const LandingPadInfo *LandingPad = LandingPads[P.PadIndex];
assert(BeginLabel == LandingPad->BeginLabels[P.RangeIndex] &&
"Inconsistent landing pad map!");
// Mono emits one landing pad for each CLR exception clause,
// and the type info contains the clause index
assert (LandingPad->TypeIds.size() == 1);
assert (LandingPad->LandingPadLabel);
LastLabel = LandingPad->EndLabels[P.RangeIndex];
MonoCallSiteEntry Site = {BeginLabel, LastLabel,
LandingPad->LandingPadLabel, LandingPad->TypeIds [0]};
assert(Site.BeginLabel && Site.EndLabel && Site.PadLabel &&
"Invalid landing pad!");
// FIXME: This doesn't work because it includes ranges outside clauses
#if 0
// Try to merge with the previous call-site.
if (CallSites.size()) {
MonoCallSiteEntry &Prev = CallSites.back();
if (Site.PadLabel == Prev.PadLabel && Site.TypeID == Prev.TypeID) {
// Extend the range of the previous entry.
Prev.EndLabel = Site.EndLabel;
continue;
}
}
#endif
// Otherwise, create a new call-site.
CallSites.push_back(Site);
}
}
//
// Compute a mapping from method names to their AOT method index
//
if (FuncIndexes.size () == 0) {
const Module *m = MMI->getModule ();
NamedMDNode *indexes = m->getNamedMetadata ("mono.function_indexes");
if (indexes) {
for (unsigned int i = 0; i < indexes->getNumOperands (); ++i) {
MDNode *n = indexes->getOperand (i);
MDString *s = (MDString*)n->getOperand (0);
ConstantInt *idx = (ConstantInt*)n->getOperand (1);
FuncIndexes.GetOrCreateValue (s->getString (), (int)idx->getLimitedValue () + 1);
}
}
}
MonoEHFrameInfo *MonoEH = &EHFrameInfo->MonoEH;
// Save information for EmitMonoLSDA
MonoEH->MF = Asm->MF;
MonoEH->FunctionNumber = Asm->getFunctionNumber();
MonoEH->CallSites.insert(MonoEH->CallSites.begin(), CallSites.begin(), CallSites.end());
MonoEH->TypeInfos = TypeInfos;
MonoEH->PadInfos = PadInfos;
MonoEH->MonoMethodIdx = FuncIndexes.lookup (Asm->MF->getFunction ()->getName ()) - 1;
//outs()<<"A:"<<Asm->MF->getFunction()->getName() << " " << MonoEH->MonoMethodIdx << "\n";
int ThisSlot = Asm->MF->getMonoInfo()->getThisStackSlot();
if (ThisSlot != -1) {
unsigned FrameReg;
MonoEH->ThisOffset = Asm->MF->getTarget ().getSubtargetImpl ()->getFrameLowering ()->getFrameIndexReference (*Asm->MF, ThisSlot, FrameReg);
MonoEH->FrameReg = Asm->MF->getTarget ().getSubtargetImpl ()->getRegisterInfo ()->getDwarfRegNum (FrameReg, true);
} else {
MonoEH->FrameReg = -1;
}
}
