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[Hexagon] Opaquify pointer usage in GEP commoning
This commit is contained in:
Krzysztof Parzyszek
parent
f3d75b435d
commit
e449924346
@ -11,6 +11,7 @@
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SetVector.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Analysis/LoopInfo.h"
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#include "llvm/Analysis/PostDominators.h"
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@ -179,8 +180,20 @@ namespace {
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Root = 0x01,
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Internal = 0x02,
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Used = 0x04,
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InBounds = 0x08
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InBounds = 0x08,
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Pointer = 0x10, // See note below.
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};
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// Note: GEP indices generally traverse nested types, and so a GepNode
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// (representing a single index) can be associated with some composite
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// type. The exception is the GEP input, which is a pointer, and not
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// a composite type (at least not in the sense of having sub-types).
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// Also, the corresponding index plays a different role as well: it is
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// simply added to the input pointer. Since pointer types are becoming
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// opaque (i.e. are no longer going to include the pointee type), the
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// two pieces of information (1) the fact that it's a pointer, and
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// (2) the pointee type, need to be stored separately. The pointee type
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// will be stored in the PTy member, while the fact that the node
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// operates on a pointer will be reflected by the flag "Pointer".
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uint32_t Flags = 0;
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union {
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@ -188,7 +201,9 @@ namespace {
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Value *BaseVal;
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};
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Value *Idx = nullptr;
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Type *PTy = nullptr; // Type of the pointer operand.
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Type *PTy = nullptr; // Type indexed by this node. For pointer nodes
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// this is the "pointee" type, and indexing a
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// pointer does not change the type.
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GepNode() : Parent(nullptr) {}
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GepNode(const GepNode *N) : Flags(N->Flags), Idx(N->Idx), PTy(N->PTy) {
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@ -201,12 +216,6 @@ namespace {
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friend raw_ostream &operator<< (raw_ostream &OS, const GepNode &GN);
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};
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Type *next_type(Type *Ty, Value *Idx) {
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if (auto *PTy = dyn_cast<PointerType>(Ty))
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return PTy->getElementType();
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return GetElementPtrInst::getTypeAtIndex(Ty, Idx);
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}
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raw_ostream &operator<< (raw_ostream &OS, const GepNode &GN) {
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OS << "{ {";
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bool Comma = false;
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@ -230,6 +239,11 @@ namespace {
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OS << ',';
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OS << "inbounds";
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}
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if (GN.Flags & GepNode::Pointer) {
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if (Comma)
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OS << ',';
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OS << "pointer";
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}
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OS << "} ";
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if (GN.Flags & GepNode::Root)
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OS << "BaseVal:" << GN.BaseVal->getName() << '(' << GN.BaseVal << ')';
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@ -347,7 +361,8 @@ void HexagonCommonGEP::processGepInst(GetElementPtrInst *GepI,
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// chain. Link to it here.
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N->Parent = F->second;
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}
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N->PTy = PtrOp->getType();
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N->PTy = GepI->getSourceElementType();
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N->Flags |= GepNode::Pointer;
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N->Idx = *GepI->idx_begin();
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// Collect the list of users of this GEP instruction. Will add it to the
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@ -367,10 +382,10 @@ void HexagonCommonGEP::processGepInst(GetElementPtrInst *GepI,
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Nodes.push_back(N);
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NodeOrder.insert(N);
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// Skip the first index operand, since we only handle 0. This dereferences
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// the pointer operand.
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// Skip the first index operand, since it was already handled above. This
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// dereferences the pointer operand.
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GepNode *PN = N;
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Type *PtrTy = cast<PointerType>(PtrOp->getType())->getElementType();
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Type *PtrTy = GepI->getSourceElementType();
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for (User::op_iterator OI = GepI->idx_begin()+1, OE = GepI->idx_end();
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OI != OE; ++OI) {
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Value *Op = *OI;
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@ -383,7 +398,7 @@ void HexagonCommonGEP::processGepInst(GetElementPtrInst *GepI,
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NodeOrder.insert(Nx);
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PN = Nx;
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PtrTy = next_type(PtrTy, Op);
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PtrTy = GetElementPtrInst::getTypeAtIndex(PtrTy, Op);
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}
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// After last node has been created, update the use information.
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@ -503,16 +518,18 @@ static bool node_eq(GepNode *N1, GepNode *N2, NodePairSet &Eq,
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return false;
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// Not previously compared.
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bool Root1 = N1->Flags & GepNode::Root;
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bool Root2 = N2->Flags & GepNode::Root;
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uint32_t CmpFlags = GepNode::Root | GepNode::Pointer;
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bool Different = (N1->Flags & CmpFlags) != (N2->Flags & CmpFlags);
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NodePair P = node_pair(N1, N2);
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// If the Root flag has different values, the nodes are different.
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// If the root/pointer flags have different values, the nodes are
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// different.
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// If both nodes are root nodes, but their base pointers differ,
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// they are different.
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if (Root1 != Root2 || (Root1 && N1->BaseVal != N2->BaseVal)) {
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if (Different || (Root1 && N1->BaseVal != N2->BaseVal)) {
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Ne.insert(P);
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return false;
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}
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// Here the root flags are identical, and for root nodes the
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// Here the root/pointer flags are identical, and for root nodes the
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// base pointers are equal, so the root nodes are equal.
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// For non-root nodes, compare their parent nodes.
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if (Root1 || node_eq(N1->Parent, N2->Parent, Eq, Ne)) {
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@ -927,8 +944,10 @@ namespace {
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for (NodeToValueMap::const_iterator I = Loc.Map.begin(), E = Loc.Map.end();
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I != E; ++I) {
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OS << I->first << " -> ";
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BasicBlock *B = cast<BasicBlock>(I->second);
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if (BasicBlock *B = cast_or_null<BasicBlock>(I->second))
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OS << B->getName() << '(' << B << ')';
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else
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OS << "<null-block>";
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OS << '\n';
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}
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return OS;
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@ -1088,41 +1107,39 @@ Value *HexagonCommonGEP::fabricateGEP(NodeVect &NA, BasicBlock::iterator At,
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GetElementPtrInst *NewInst = nullptr;
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Value *Input = RN->BaseVal;
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Value **IdxList = new Value*[Num+1];
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unsigned nax = 0;
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Type *InpTy = RN->PTy;
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unsigned Idx = 0;
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do {
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unsigned IdxC = 0;
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SmallVector<Value*, 4> IdxList;
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// If the type of the input of the first node is not a pointer,
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// we need to add an artificial i32 0 to the indices (because the
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// actual input in the IR will be a pointer).
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if (!NA[nax]->PTy->isPointerTy()) {
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if (!(NA[Idx]->Flags & GepNode::Pointer)) {
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Type *Int32Ty = Type::getInt32Ty(*Ctx);
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IdxList[IdxC++] = ConstantInt::get(Int32Ty, 0);
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IdxList.push_back(ConstantInt::get(Int32Ty, 0));
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}
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// Keep adding indices from NA until we have to stop and generate
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// an "intermediate" GEP.
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while (++nax <= Num) {
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GepNode *N = NA[nax-1];
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IdxList[IdxC++] = N->Idx;
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if (nax < Num) {
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// We have to stop, if the expected type of the output of this node
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// is not the same as the input type of the next node.
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Type *NextTy = next_type(N->PTy, N->Idx);
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if (NextTy != NA[nax]->PTy)
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while (++Idx <= Num) {
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GepNode *N = NA[Idx-1];
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IdxList.push_back(N->Idx);
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if (Idx < Num) {
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// We have to stop if we reach a pointer.
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if (NA[Idx]->Flags & GepNode::Pointer)
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break;
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}
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}
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ArrayRef<Value*> A(IdxList, IdxC);
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Type *InpTy = Input->getType();
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Type *ElTy = cast<PointerType>(InpTy->getScalarType())->getElementType();
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NewInst = GetElementPtrInst::Create(ElTy, Input, A, "cgep", &*At);
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NewInst = GetElementPtrInst::Create(InpTy, Input, IdxList, "cgep", &*At);
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NewInst->setIsInBounds(RN->Flags & GepNode::InBounds);
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LLVM_DEBUG(dbgs() << "new GEP: " << *NewInst << '\n');
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if (Idx < Num) {
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Input = NewInst;
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} while (nax <= Num);
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InpTy = NA[Idx]->PTy;
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}
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} while (Idx <= Num);
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delete[] IdxList;
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return NewInst;
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}
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