//
//===----------------------------------------------------------------------===//
-#include "NVPTX.h"
+#include "llvm/Transforms/Scalar.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/ValueMapper.h"
-#define DEBUG_TYPE "nvptx-infer-addrspace"
+#define DEBUG_TYPE "infer-address-spaces"
using namespace llvm;
using ValueToAddrSpaceMapTy = DenseMap<const Value *, unsigned>;
-/// \brief NVPTXInferAddressSpaces
-class NVPTXInferAddressSpaces: public FunctionPass {
+/// \brief InferAddressSpaces
+class InferAddressSpaces: public FunctionPass {
/// Target specific address space which uses of should be replaced if
/// possible.
unsigned FlatAddrSpace;
public:
static char ID;
- NVPTXInferAddressSpaces() : FunctionPass(ID) {}
+ InferAddressSpaces() : FunctionPass(ID) {}
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesCFG();
};
} // end anonymous namespace
-char NVPTXInferAddressSpaces::ID = 0;
+char InferAddressSpaces::ID = 0;
namespace llvm {
-void initializeNVPTXInferAddressSpacesPass(PassRegistry &);
+void initializeInferAddressSpacesPass(PassRegistry &);
}
-INITIALIZE_PASS(NVPTXInferAddressSpaces, "nvptx-infer-addrspace",
- "Infer address spaces",
+
+INITIALIZE_PASS(InferAddressSpaces, DEBUG_TYPE, "Infer address spaces",
false, false)
// Returns true if V is an address expression.
// If V is an unvisited flat address expression, appends V to PostorderStack
// and marks it as visited.
-void NVPTXInferAddressSpaces::appendsFlatAddressExpressionToPostorderStack(
- Value *V, std::vector<std::pair<Value *, bool>> *PostorderStack,
- DenseSet<Value *> *Visited) const {
+void InferAddressSpaces::appendsFlatAddressExpressionToPostorderStack(
+ Value *V, std::vector<std::pair<Value *, bool>> *PostorderStack,
+ DenseSet<Value *> *Visited) const {
assert(V->getType()->isPointerTy());
if (isAddressExpression(*V) &&
V->getType()->getPointerAddressSpace() == FlatAddrSpace) {
// Returns all flat address expressions in function F. The elements are ordered
// in postorder.
std::vector<Value *>
-NVPTXInferAddressSpaces::collectFlatAddressExpressions(Function &F) const {
+InferAddressSpaces::collectFlatAddressExpressions(Function &F) const {
// This function implements a non-recursive postorder traversal of a partial
// use-def graph of function F.
std::vector<std::pair<Value*, bool>> PostorderStack;
for (Instruction &I : instructions(F)) {
if (isa<LoadInst>(I)) {
appendsFlatAddressExpressionToPostorderStack(
- I.getOperand(0), &PostorderStack, &Visited);
+ I.getOperand(0), &PostorderStack, &Visited);
} else if (isa<StoreInst>(I)) {
appendsFlatAddressExpressionToPostorderStack(
- I.getOperand(1), &PostorderStack, &Visited);
+ I.getOperand(1), &PostorderStack, &Visited);
}
}
PostorderStack.back().second = true;
for (Value *PtrOperand : getPointerOperands(*PostorderStack.back().first)) {
appendsFlatAddressExpressionToPostorderStack(
- PtrOperand, &PostorderStack, &Visited);
+ PtrOperand, &PostorderStack, &Visited);
}
}
return Postorder;
// of OperandUse.get() in the new address space. If the clone is not ready yet,
// returns an undef in the new address space as a placeholder.
static Value *operandWithNewAddressSpaceOrCreateUndef(
- const Use &OperandUse, unsigned NewAddrSpace,
- const ValueToValueMapTy &ValueWithNewAddrSpace,
- SmallVectorImpl<const Use *> *UndefUsesToFix) {
+ const Use &OperandUse, unsigned NewAddrSpace,
+ const ValueToValueMapTy &ValueWithNewAddrSpace,
+ SmallVectorImpl<const Use *> *UndefUsesToFix) {
Value *Operand = OperandUse.get();
if (Value *NewOperand = ValueWithNewAddrSpace.lookup(Operand))
return NewOperand;
UndefUsesToFix->push_back(&OperandUse);
return UndefValue::get(
- Operand->getType()->getPointerElementType()->getPointerTo(NewAddrSpace));
+ Operand->getType()->getPointerElementType()->getPointerTo(NewAddrSpace));
}
// Returns a clone of `I` with its operands converted to those specified in
// from a pointer whose type already matches. Therefore, this function returns a
// Value* instead of an Instruction*.
static Value *cloneInstructionWithNewAddressSpace(
- Instruction *I, unsigned NewAddrSpace,
- const ValueToValueMapTy &ValueWithNewAddrSpace,
- SmallVectorImpl<const Use *> *UndefUsesToFix) {
+ Instruction *I, unsigned NewAddrSpace,
+ const ValueToValueMapTy &ValueWithNewAddrSpace,
+ SmallVectorImpl<const Use *> *UndefUsesToFix) {
Type *NewPtrType =
- I->getType()->getPointerElementType()->getPointerTo(NewAddrSpace);
+ I->getType()->getPointerElementType()->getPointerTo(NewAddrSpace);
if (I->getOpcode() == Instruction::AddrSpaceCast) {
Value *Src = I->getOperand(0);
NewPointerOperands.push_back(nullptr);
else
NewPointerOperands.push_back(operandWithNewAddressSpaceOrCreateUndef(
- OperandUse, NewAddrSpace, ValueWithNewAddrSpace, UndefUsesToFix));
+ OperandUse, NewAddrSpace, ValueWithNewAddrSpace, UndefUsesToFix));
}
switch (I->getOpcode()) {
case Instruction::GetElementPtr: {
GetElementPtrInst *GEP = cast<GetElementPtrInst>(I);
GetElementPtrInst *NewGEP = GetElementPtrInst::Create(
- GEP->getSourceElementType(), NewPointerOperands[0],
- SmallVector<Value *, 4>(GEP->idx_begin(), GEP->idx_end()));
+ GEP->getSourceElementType(), NewPointerOperands[0],
+ SmallVector<Value *, 4>(GEP->idx_begin(), GEP->idx_end()));
NewGEP->setIsInBounds(GEP->isInBounds());
return NewGEP;
}
// constant expression `CE` with its operands replaced as specified in
// ValueWithNewAddrSpace.
static Value *cloneConstantExprWithNewAddressSpace(
- ConstantExpr *CE, unsigned NewAddrSpace,
- const ValueToValueMapTy &ValueWithNewAddrSpace) {
+ ConstantExpr *CE, unsigned NewAddrSpace,
+ const ValueToValueMapTy &ValueWithNewAddrSpace) {
Type *TargetType =
- CE->getType()->getPointerElementType()->getPointerTo(NewAddrSpace);
+ CE->getType()->getPointerElementType()->getPointerTo(NewAddrSpace);
if (CE->getOpcode() == Instruction::AddrSpaceCast) {
// Because CE is flat, the source address space must be specific.
// Needs to specify the source type while constructing a getelementptr
// constant expression.
return CE->getWithOperands(
- NewOperands, TargetType, /*OnlyIfReduced=*/false,
- NewOperands[0]->getType()->getPointerElementType());
+ NewOperands, TargetType, /*OnlyIfReduced=*/false,
+ NewOperands[0]->getType()->getPointerElementType());
}
return CE->getWithOperands(NewOperands, TargetType);
// expression whose address space needs to be modified, in postorder.
//
// See cloneInstructionWithNewAddressSpace for the meaning of UndefUsesToFix.
-Value *NVPTXInferAddressSpaces::cloneValueWithNewAddressSpace(
+Value *InferAddressSpaces::cloneValueWithNewAddressSpace(
Value *V, unsigned NewAddrSpace,
const ValueToValueMapTy &ValueWithNewAddrSpace,
SmallVectorImpl<const Use *> *UndefUsesToFix) const {
if (Instruction *I = dyn_cast<Instruction>(V)) {
Value *NewV = cloneInstructionWithNewAddressSpace(
- I, NewAddrSpace, ValueWithNewAddrSpace, UndefUsesToFix);
+ I, NewAddrSpace, ValueWithNewAddrSpace, UndefUsesToFix);
if (Instruction *NewI = dyn_cast<Instruction>(NewV)) {
if (NewI->getParent() == nullptr) {
NewI->insertBefore(I);
}
return cloneConstantExprWithNewAddressSpace(
- cast<ConstantExpr>(V), NewAddrSpace, ValueWithNewAddrSpace);
+ cast<ConstantExpr>(V), NewAddrSpace, ValueWithNewAddrSpace);
}
// Defines the join operation on the address space lattice (see the file header
// comments).
-unsigned NVPTXInferAddressSpaces::joinAddressSpaces(unsigned AS1,
- unsigned AS2) const {
+unsigned InferAddressSpaces::joinAddressSpaces(unsigned AS1,
+ unsigned AS2) const {
if (AS1 == FlatAddrSpace || AS2 == FlatAddrSpace)
return FlatAddrSpace;
return (AS1 == AS2) ? AS1 : FlatAddrSpace;
}
-bool NVPTXInferAddressSpaces::runOnFunction(Function &F) {
+bool InferAddressSpaces::runOnFunction(Function &F) {
if (skipFunction(F))
return false;
return rewriteWithNewAddressSpaces(Postorder, InferredAddrSpace, &F);
}
-void NVPTXInferAddressSpaces::inferAddressSpaces(
- const std::vector<Value *> &Postorder,
- ValueToAddrSpaceMapTy *InferredAddrSpace) const {
+void InferAddressSpaces::inferAddressSpaces(
+ const std::vector<Value *> &Postorder,
+ ValueToAddrSpaceMapTy *InferredAddrSpace) const {
SetVector<Value *> Worklist(Postorder.begin(), Postorder.end());
// Initially, all expressions are in the uninitialized address space.
for (Value *V : Postorder)
continue;
// Function updateAddressSpace moves the address space down a lattice
- // path. Therefore, nothing to do if User is already inferred as flat
- // (the bottom element in the lattice).
+ // path. Therefore, nothing to do if User is already inferred as flat (the
+ // bottom element in the lattice).
if (Pos->second == FlatAddrSpace)
continue;
}
}
-Optional<unsigned> NVPTXInferAddressSpaces::updateAddressSpace(
- const Value &V, const ValueToAddrSpaceMapTy &InferredAddrSpace) const {
+Optional<unsigned> InferAddressSpaces::updateAddressSpace(
+ const Value &V, const ValueToAddrSpaceMapTy &InferredAddrSpace) const {
assert(InferredAddrSpace.count(&V));
// The new inferred address space equals the join of the address spaces
else
OperandAS = PtrOperand->getType()->getPointerAddressSpace();
NewAS = joinAddressSpaces(NewAS, OperandAS);
- // join(flat, *) = flat. So we can break if NewAS is already generic.
+
+ // join(flat, *) = flat. So we can break if NewAS is already flat.
if (NewAS == FlatAddrSpace)
break;
}
return NewAS;
}
-bool NVPTXInferAddressSpaces::rewriteWithNewAddressSpaces(
- const std::vector<Value *> &Postorder,
- const ValueToAddrSpaceMapTy &InferredAddrSpace, Function *F) const {
+bool InferAddressSpaces::rewriteWithNewAddressSpaces(
+ const std::vector<Value *> &Postorder,
+ const ValueToAddrSpaceMapTy &InferredAddrSpace, Function *F) const {
// For each address expression to be modified, creates a clone of it with its
// pointer operands converted to the new address space. Since the pointer
// operands are converted, the clone is naturally in the new address space by
unsigned NewAddrSpace = InferredAddrSpace.lookup(V);
if (V->getType()->getPointerAddressSpace() != NewAddrSpace) {
ValueWithNewAddrSpace[V] = cloneValueWithNewAddressSpace(
- V, NewAddrSpace, ValueWithNewAddrSpace, &UndefUsesToFix);
+ V, NewAddrSpace, ValueWithNewAddrSpace, &UndefUsesToFix);
}
}
// so the resultant load/store is still valid.
U->set(NewV);
} else if (isa<Instruction>(U->getUser())) {
- // Otherwise, replaces the use with generic(NewV).
+ // Otherwise, replaces the use with flat(NewV).
// TODO: Some optimization opportunities are missed. For example, in
// %0 = icmp eq float* %p, %q
// if both p and q are inferred to be shared, we can rewrite %0 as
// %0 = icmp eq float addrspace(3)* %new_p, %new_q
// instead of currently
- // %generic_p = addrspacecast float addrspace(3)* %new_p to float*
- // %generic_q = addrspacecast float addrspace(3)* %new_q to float*
- // %0 = icmp eq float* %generic_p, %generic_q
+ // %flat_p = addrspacecast float addrspace(3)* %new_p to float*
+ // %flat_q = addrspacecast float addrspace(3)* %new_q to float*
+ // %0 = icmp eq float* %flat_p, %flat_q
if (Instruction *I = dyn_cast<Instruction>(V)) {
BasicBlock::iterator InsertPos = std::next(I->getIterator());
while (isa<PHINode>(InsertPos))
return true;
}
-FunctionPass *llvm::createNVPTXInferAddressSpacesPass() {
- return new NVPTXInferAddressSpaces();
+FunctionPass *llvm::createInferAddressSpacesPass() {
+ return new InferAddressSpaces();
}
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