void TempScopInfo::buildAccessFunctions(Region &R, ParamSetType &Params,
BasicBlock &BB) {
AccFuncSetType Functions;
for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I) {
Instruction &Inst = *I;
if (isa<LoadInst>(&Inst) || isa<StoreInst>(&Inst)) {
// Create the SCEVAffFunc.
if (LoadInst *ld = dyn_cast<LoadInst>(&Inst)) {
unsigned size = TD->getTypeStoreSize(ld->getType());
Functions.push_back(
std::make_pair(SCEVAffFunc(SCEVAffFunc::ReadMem, size), &Inst));
} else {//Else it must be a StoreInst.
StoreInst *st = cast<StoreInst>(&Inst);
unsigned size = TD->getTypeStoreSize(st->getValueOperand()->getType());
Functions.push_back(
std::make_pair(SCEVAffFunc(SCEVAffFunc::WriteMem, size), &Inst));
}
Value *Ptr = getPointerOperand(Inst);
buildAffineFunction(SE->getSCEV(Ptr), Functions.back().first, R, Params);
}
}
if (Functions.empty())
return;
AccFuncSetType &Accs = AccFuncMap[&BB];
Accs.insert(Accs.end(), Functions.begin(), Functions.end());
}
void TempScopInfo::buildAccessFunctions(Region &R, BasicBlock &BB) {
AccFuncSetType Functions;
for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I) {
Instruction &Inst = *I;
if (isa<LoadInst>(&Inst) || isa<StoreInst>(&Inst)) {
unsigned Size;
enum IRAccess::TypeKind Type;
if (LoadInst *Load = dyn_cast<LoadInst>(&Inst)) {
Size = TD->getTypeStoreSize(Load->getType());
Type = IRAccess::READ;
} else {
StoreInst *Store = cast<StoreInst>(&Inst);
Size = TD->getTypeStoreSize(Store->getValueOperand()->getType());
Type = IRAccess::WRITE;
}
const SCEV *AccessFunction = SE->getSCEV(getPointerOperand(Inst));
const SCEVUnknown *BasePointer =
dyn_cast<SCEVUnknown>(SE->getPointerBase(AccessFunction));
assert(BasePointer && "Could not find base pointer");
AccessFunction = SE->getMinusSCEV(AccessFunction, BasePointer);
bool IsAffine =
isAffineExpr(&R, AccessFunction, *SE, BasePointer->getValue());
Functions.push_back(
std::make_pair(IRAccess(Type, BasePointer->getValue(), AccessFunction,
Size, IsAffine), &Inst));
}
}
if (Functions.empty())
return;
AccFuncSetType &Accs = AccFuncMap[&BB];
Accs.insert(Accs.end(), Functions.begin(), Functions.end());
}
void TempScopInfo::buildAccessFunctions(Region &R, BasicBlock &BB,
Region *NonAffineSubRegion) {
AccFuncSetType Functions;
Loop *L = LI->getLoopFor(&BB);
// The set of loops contained in non-affine subregions that are part of R.
const ScopDetection::BoxedLoopsSetTy *BoxedLoops = SD->getBoxedLoops(&R);
for (BasicBlock::iterator I = BB.begin(), E = --BB.end(); I != E; ++I) {
Instruction *Inst = I;
if (isa<LoadInst>(Inst) || isa<StoreInst>(Inst))
Functions.push_back(
std::make_pair(buildIRAccess(Inst, L, &R, BoxedLoops), Inst));
if (PHINode *PHI = dyn_cast<PHINode>(Inst))
buildPHIAccesses(PHI, R, Functions, NonAffineSubRegion);
if (!isa<StoreInst>(Inst) &&
buildScalarDependences(Inst, &R, NonAffineSubRegion)) {
// If the Instruction is used outside the statement, we need to build the
// write access.
IRAccess ScalarAccess(IRAccess::MUST_WRITE, Inst, ZeroOffset, 1, true);
Functions.push_back(std::make_pair(ScalarAccess, Inst));
}
}
if (Functions.empty())
return;
AccFuncSetType &Accs = AccFuncMap[&BB];
Accs.insert(Accs.end(), Functions.begin(), Functions.end());
}
void TempScopInfo::buildPHIAccesses(PHINode *PHI, Region &R,
AccFuncSetType &Functions,
Region *NonAffineSubRegion) {
if (canSynthesize(PHI, LI, SE, &R))
return;
// PHI nodes are modeled as if they had been demoted prior to the SCoP
// detection. Hence, the PHI is a load of a new memory location in which the
// incoming value was written at the end of the incoming basic block.
bool Written = false;
for (unsigned u = 0; u < PHI->getNumIncomingValues(); u++) {
Value *Op = PHI->getIncomingValue(u);
BasicBlock *OpBB = PHI->getIncomingBlock(u);
if (!R.contains(OpBB))
continue;
// Do not build scalar dependences inside a non-affine subregion.
if (NonAffineSubRegion && NonAffineSubRegion->contains(OpBB))
continue;
Instruction *OpI = dyn_cast<Instruction>(Op);
if (OpI) {
BasicBlock *OpIBB = OpI->getParent();
// As we pretend there is a use (or more precise a write) of OpI in OpBB
// we have to insert a scalar dependence from the definition of OpI to
// OpBB if the definition is not in OpBB.
if (OpIBB != OpBB) {
IRAccess ScalarRead(IRAccess::READ, OpI, ZeroOffset, 1, true);
AccFuncMap[OpBB].push_back(std::make_pair(ScalarRead, PHI));
IRAccess ScalarWrite(IRAccess::MUST_WRITE, OpI, ZeroOffset, 1, true);
AccFuncMap[OpIBB].push_back(std::make_pair(ScalarWrite, OpI));
}
}
// If the operand is a constant, global or argument we need an access
// instruction and just choose the PHI.
if (!OpI)
OpI = PHI;
Written = true;
IRAccess ScalarAccess(IRAccess::MUST_WRITE, PHI, ZeroOffset, 1, true);
AccFuncMap[OpBB].push_back(std::make_pair(ScalarAccess, OpI));
}
if (Written) {
IRAccess ScalarAccess(IRAccess::READ, PHI, ZeroOffset, 1, true);
Functions.push_back(std::make_pair(ScalarAccess, PHI));
}
}
