void fun_llvm_2_nts::process_instruction ( const llvm::Instruction & i, StateInfo & st )
{
switch ( i.getOpcode() )
{
case Instruction::Alloca:
return ctx.m_alloca.process ( bni, st, funmap, i );
case Instruction::Call:
return ctx.m_icall.process ( bni, st, funmap, i );
case Instruction::Store:
case Instruction::Load:
case Instruction::Ret:
return ctx.m_ils.process ( bni, st, funmap, i );
case Instruction::Add:
return ctx.m_ia.process ( bni, st, funmap, i );
case Instruction::ICmp:
return ctx.m_icmp.process ( bni, st, funmap, i );
case Instruction::Br:
return ctx.m_ibr.process ( bni, st, funmap, i );
default:
{
string s ( "Instruction not implemented: " );
throw std::domain_error ( ( s + i.getOpcodeName() ).c_str() );
}
}
}
/// \brief Set the currently active llvm::Instruction.
///
void
setActiveInstruction(llvm::Instruction const * const NewActiveInstruction) {
ActiveInstruction = NewActiveInstruction;
auto const BB = ActiveInstruction->getParent();
if (BB != ActiveBasicBlock) {
PreviousBasicBlock = ActiveBasicBlock;
ActiveBasicBlock = BB;
}
}
bool DINOGlobal::isFuncEntryInstruction(llvm::Instruction &I){
llvm::BasicBlock *B = I.getParent();
llvm::Function *F = B->getParent();
llvm::BasicBlock &FuncEntryBlock = F->front();
llvm::Instruction &FuncEntryInst = FuncEntryBlock.front();
if( &I == &FuncEntryInst ){
return true;
}
return false;
}
static bool instMatchesCrit(LLVMDependenceGraph& dg,
const llvm::Instruction& I,
const std::vector<std::pair<int, std::string>>& parsedCrit)
{
for (const auto& c : parsedCrit) {
auto& Loc = I.getDebugLoc();
if (!Loc)
continue;
if (static_cast<int>(Loc.getLine()) != c.first)
continue;
if (isStoreToTheVar(dg, I, c.second) ||
isLoadOfTheVar(dg, I, c.second)) {
llvm::errs() << "Matched line " << c.first << " with variable "
<< c.second << " to:\n" << I << "\n";
return true;
}
}
return false;
}
/// canHoistInst - Return true if the hoister can handle this instruction.
bool Hoister::canHoistInst(llvm::Instruction &I, llvm::AliasAnalysis *AA)
{
// Loads have extra constraints we have to verify before we can hoist them.
if (llvm::LoadInst *LI = llvm::dyn_cast<llvm::LoadInst>(&I)) {
if (LI->isVolatile()) {
return false; // Don't hoist volatile loads!
}
// Loads from constant memory are always safe to move, even if they end up
// in the same alias set as something that ends up being modified.
if (AA->pointsToConstantMemory(LI->getOperand(0))) {
return true;
}
// Don't hoist loads which have may-aliased stores in loop.
uint64_t Size = 0;
if (LI->getType()->isSized()) {
#if LLVM_VERSION <= VERSION(3, 7)
Size = AA->getTypeStoreSize(LI->getType());
#else
Size = I.getModule()->getDataLayout().getTypeStoreSize(LI->getType());
#endif
}
#if LLVM_VERSION <= VERSION(3, 5)
return !CurAST->getAliasSetForPointer(LI->getOperand(0), Size, LI->getMetadata(llvm::LLVMContext::MD_tbaa)).isMod();
#else
llvm::AAMDNodes AAInfo;
LI->getAAMetadata(AAInfo);
return !CurAST->getAliasSetForPointer(LI->getOperand(0), Size, AAInfo).isMod();
#endif
} else if (llvm::CallInst *CI = llvm::dyn_cast<llvm::CallInst>(&I)) {
// Handle obvious cases efficiently.
#if LLVM_VERSION <= VERSION(3, 7)
llvm::AliasAnalysis::ModRefBehavior Behavior = AA->getModRefBehavior(CI);
#else
llvm::FunctionModRefBehavior Behavior = AA->getModRefBehavior(CI);
#endif
#if LLVM_VERSION <= VERSION(3, 7)
if (Behavior == llvm::AliasAnalysis::DoesNotAccessMemory || doesNotAccessMemory(CI->getCalledFunction())) {
#else
if (Behavior == llvm::FMRB_DoesNotAccessMemory || doesNotAccessMemory(CI->getCalledFunction())) {
#endif
return true;
#if LLVM_VERSION <= VERSION(3, 7)
} else if (Behavior == llvm::AliasAnalysis::OnlyReadsMemory) {
#else
} else if (Behavior == llvm::FMRB_OnlyReadsMemory) {
#endif
// If this call only reads from memory and there are no writes to memory
// in the loop, we can hoist or sink the call as appropriate.
bool FoundMod = false;
for (llvm::AliasSetTracker::iterator IT = CurAST->begin(), ET = CurAST->end(); IT != ET; ++IT) {
llvm::AliasSet &AS = *IT;
if (!AS.isForwardingAliasSet() && AS.isMod()) {
FoundMod = true;
break;
}
}
if (!FoundMod) {
return true;
}
}
// FIXME: This should use mod/ref information to see if we can hoist the call.
return false;
}
// Otherwise these instructions are hoistable.
if (llvm::isa<llvm::BinaryOperator>(I)) {
llvm::BinaryOperator *binop = llvm::cast<llvm::BinaryOperator>(&I);
llvm::BinaryOperator::BinaryOps opcode = binop->getOpcode();
if (opcode == llvm::BinaryOperator::Xor) {
if (llvm::isa<llvm::ConstantInt>(I.getOperand(1)) && llvm::cast<llvm::ConstantInt>(I.getOperand(1))->isAllOnesValue()) {
// it is xor %i, -1 --> actually, it is -%i - 1
return false;
} else {
return true;
}
} else if (I.getType()->isFloatingPointTy()) {
return true;
} else {
bool res = (opcode == llvm::BinaryOperator::SDiv);
res |= (opcode == llvm::BinaryOperator::UDiv);
res |= (opcode == llvm::BinaryOperator::SRem);
res |= (opcode == llvm::BinaryOperator::URem);
res |= (opcode == llvm::BinaryOperator::AShr);
res |= (opcode == llvm::BinaryOperator::LShr);
res |= (opcode == llvm::BinaryOperator::Shl);
res |= (opcode == llvm::BinaryOperator::And);
res |= (opcode == llvm::BinaryOperator::Or);
res |= (opcode == llvm::BinaryOperator::Xor);
return res;
}
} else if (llvm::isa<llvm::ZExtInst>(I) || llvm::isa<llvm::SExtInst>(I) || llvm::isa<llvm::TruncInst>(I)) {
return true;
} else if (llvm::isa<llvm::PHINode>(I)) {
return false;
} else if (llvm::isa<llvm::PtrToIntInst>(I)) {
return true;
} else if (llvm::isa<llvm::FPToSIInst>(I) || llvm::isa<llvm::FPToUIInst>(I)) {
return true;
} else if (llvm::isa<llvm::PointerType>(I.getType())) {
return true;
} else {
return false;
}
}
/// isLoopInvariantInst - Return true if all operands of this instruction are loop invariant.
bool Hoister::isLoopInvariantInst(llvm::Loop *L, llvm::Instruction &I)
{
// The instruction is loop invariant if all of its operands are loop-invariant
for (unsigned int i = 0, e = I.getNumOperands(); i != e; ++i) {
if (!L->isLoopInvariant(I.getOperand(i))) {
return false;
}
}
// If we got this far, the instruction is loop invariant!
return true;
}
/// hoist - When an instruction is found to only use loop invariant operands
/// that is safe to hoist, this instruction is called to do the dirty work.
void Hoister::hoist(llvm::BasicBlock *preheader, llvm::Instruction &I)
{
// Remove the instruction from its current basic block... but don't delete the
// instruction.
I.removeFromParent();
// Insert the new node in Preheader, before the terminator.
I.insertBefore(preheader->getTerminator());
changed = true;
}
unsigned
InstructionCostEstimator::getInstructionCost(const llvm::Instruction &I) {
switch (I.getOpcode()) {
case llvm::Instruction::GetElementPtr:
return Cost::Low;
case llvm::Instruction::Ret:
case llvm::Instruction::PHI:
case llvm::Instruction::Br:
return Cost::No;
case llvm::Instruction::FRem:
case llvm::Instruction::FAdd:
case llvm::Instruction::FSub:
case llvm::Instruction::FMul:
case llvm::Instruction::FDiv:
return Cost::Medium;
case llvm::Instruction::Add:
case llvm::Instruction::Sub:
case llvm::Instruction::Mul:
case llvm::Instruction::UDiv:
case llvm::Instruction::SDiv:
case llvm::Instruction::URem:
case llvm::Instruction::SRem:
case llvm::Instruction::Shl:
case llvm::Instruction::LShr:
case llvm::Instruction::AShr:
case llvm::Instruction::And:
case llvm::Instruction::Or:
case llvm::Instruction::Xor:
return Cost::Low;
case llvm::Instruction::Select:
return Cost::Low;
case llvm::Instruction::ICmp:
case llvm::Instruction::FCmp:
return Cost::Low;
case llvm::Instruction::Store:
return Cost::Low;
case llvm::Instruction::Load:
return Cost::Low;
case llvm::Instruction::ZExt:
case llvm::Instruction::SExt:
case llvm::Instruction::FPToUI:
case llvm::Instruction::FPToSI:
case llvm::Instruction::FPExt:
case llvm::Instruction::PtrToInt:
case llvm::Instruction::IntToPtr:
case llvm::Instruction::SIToFP:
case llvm::Instruction::UIToFP:
case llvm::Instruction::Trunc:
case llvm::Instruction::FPTrunc:
case llvm::Instruction::BitCast:
case llvm::Instruction::AddrSpaceCast:
return Cost::No;
case llvm::Instruction::ExtractElement:
return Cost::Low;
case llvm::Instruction::InsertElement:
return Cost::Low;
case llvm::Instruction::ShuffleVector:
return Cost::Low;
case llvm::Instruction::Call:
return Cost::Low;
default:
return Cost::Low;
}
}
