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[gvn] Reformat a chunk of the GVN code that is strangely indented prior
to restructuring it for porting to the new pass manager. No functionality changed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263083 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
parent
c5266b5293
commit
61c136c43e
@ -511,272 +511,271 @@ void ValueTable::verifyRemoved(const Value *V) const {
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//===----------------------------------------------------------------------===//
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namespace {
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class GVN;
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/// Represents a particular available value that we know how to materialize.
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/// Materialization of an AvailableValue never fails. An AvailableValue is
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/// implicitly associated with a rematerialization point which is the
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/// location of the instruction from which it was formed.
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struct AvailableValue {
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enum ValType {
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SimpleVal, // A simple offsetted value that is accessed.
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LoadVal, // A value produced by a load.
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MemIntrin, // A memory intrinsic which is loaded from.
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UndefVal // A UndefValue representing a value from dead block (which
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// is not yet physically removed from the CFG).
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};
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/// V - The value that is live out of the block.
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PointerIntPair<Value *, 2, ValType> Val;
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/// Offset - The byte offset in Val that is interesting for the load query.
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unsigned Offset;
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static AvailableValue get(Value *V,
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unsigned Offset = 0) {
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AvailableValue Res;
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Res.Val.setPointer(V);
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Res.Val.setInt(SimpleVal);
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Res.Offset = Offset;
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return Res;
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}
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static AvailableValue getMI(MemIntrinsic *MI,
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unsigned Offset = 0) {
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AvailableValue Res;
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Res.Val.setPointer(MI);
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Res.Val.setInt(MemIntrin);
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Res.Offset = Offset;
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return Res;
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}
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static AvailableValue getLoad(LoadInst *LI,
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unsigned Offset = 0) {
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AvailableValue Res;
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Res.Val.setPointer(LI);
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Res.Val.setInt(LoadVal);
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Res.Offset = Offset;
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return Res;
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}
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class GVN;
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static AvailableValue getUndef() {
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AvailableValue Res;
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Res.Val.setPointer(nullptr);
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Res.Val.setInt(UndefVal);
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Res.Offset = 0;
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return Res;
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}
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bool isSimpleValue() const { return Val.getInt() == SimpleVal; }
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bool isCoercedLoadValue() const { return Val.getInt() == LoadVal; }
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bool isMemIntrinValue() const { return Val.getInt() == MemIntrin; }
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bool isUndefValue() const { return Val.getInt() == UndefVal; }
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Value *getSimpleValue() const {
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assert(isSimpleValue() && "Wrong accessor");
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return Val.getPointer();
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}
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LoadInst *getCoercedLoadValue() const {
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assert(isCoercedLoadValue() && "Wrong accessor");
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return cast<LoadInst>(Val.getPointer());
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}
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MemIntrinsic *getMemIntrinValue() const {
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assert(isMemIntrinValue() && "Wrong accessor");
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return cast<MemIntrinsic>(Val.getPointer());
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}
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/// Emit code at the specified insertion point to adjust the value defined
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/// here to the specified type. This handles various coercion cases.
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Value *MaterializeAdjustedValue(LoadInst *LI, Instruction *InsertPt,
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GVN &gvn) const;
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/// Represents a particular available value that we know how to materialize.
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/// Materialization of an AvailableValue never fails. An AvailableValue is
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/// implicitly associated with a rematerialization point which is the
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/// location of the instruction from which it was formed.
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struct AvailableValue {
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enum ValType {
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SimpleVal, // A simple offsetted value that is accessed.
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LoadVal, // A value produced by a load.
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MemIntrin, // A memory intrinsic which is loaded from.
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UndefVal // A UndefValue representing a value from dead block (which
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// is not yet physically removed from the CFG).
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};
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/// Represents an AvailableValue which can be rematerialized at the end of
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/// the associated BasicBlock.
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struct AvailableValueInBlock {
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/// BB - The basic block in question.
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BasicBlock *BB;
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/// V - The value that is live out of the block.
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PointerIntPair<Value *, 2, ValType> Val;
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/// AV - The actual available value
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AvailableValue AV;
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/// Offset - The byte offset in Val that is interesting for the load query.
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unsigned Offset;
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static AvailableValueInBlock get(BasicBlock *BB, AvailableValue &&AV) {
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AvailableValueInBlock Res;
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Res.BB = BB;
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Res.AV = std::move(AV);
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return Res;
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}
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static AvailableValue get(Value *V, unsigned Offset = 0) {
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AvailableValue Res;
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Res.Val.setPointer(V);
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Res.Val.setInt(SimpleVal);
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Res.Offset = Offset;
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return Res;
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}
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static AvailableValueInBlock get(BasicBlock *BB, Value *V,
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unsigned Offset = 0) {
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return get(BB, AvailableValue::get(V, Offset));
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}
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static AvailableValueInBlock getUndef(BasicBlock *BB) {
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return get(BB, AvailableValue::getUndef());
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}
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/// Emit code at the end of this block to adjust the value defined here to
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/// the specified type. This handles various coercion cases.
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Value *MaterializeAdjustedValue(LoadInst *LI, GVN &gvn) const {
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return AV.MaterializeAdjustedValue(LI, BB->getTerminator(), gvn);
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}
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static AvailableValue getMI(MemIntrinsic *MI, unsigned Offset = 0) {
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AvailableValue Res;
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Res.Val.setPointer(MI);
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Res.Val.setInt(MemIntrin);
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Res.Offset = Offset;
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return Res;
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}
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static AvailableValue getLoad(LoadInst *LI, unsigned Offset = 0) {
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AvailableValue Res;
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Res.Val.setPointer(LI);
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Res.Val.setInt(LoadVal);
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Res.Offset = Offset;
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return Res;
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}
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static AvailableValue getUndef() {
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AvailableValue Res;
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Res.Val.setPointer(nullptr);
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Res.Val.setInt(UndefVal);
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Res.Offset = 0;
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return Res;
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}
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bool isSimpleValue() const { return Val.getInt() == SimpleVal; }
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bool isCoercedLoadValue() const { return Val.getInt() == LoadVal; }
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bool isMemIntrinValue() const { return Val.getInt() == MemIntrin; }
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bool isUndefValue() const { return Val.getInt() == UndefVal; }
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Value *getSimpleValue() const {
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assert(isSimpleValue() && "Wrong accessor");
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return Val.getPointer();
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}
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LoadInst *getCoercedLoadValue() const {
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assert(isCoercedLoadValue() && "Wrong accessor");
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return cast<LoadInst>(Val.getPointer());
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}
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MemIntrinsic *getMemIntrinValue() const {
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assert(isMemIntrinValue() && "Wrong accessor");
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return cast<MemIntrinsic>(Val.getPointer());
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}
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/// Emit code at the specified insertion point to adjust the value defined
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/// here to the specified type. This handles various coercion cases.
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Value *MaterializeAdjustedValue(LoadInst *LI, Instruction *InsertPt,
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GVN &gvn) const;
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};
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/// Represents an AvailableValue which can be rematerialized at the end of
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/// the associated BasicBlock.
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struct AvailableValueInBlock {
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/// BB - The basic block in question.
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BasicBlock *BB;
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/// AV - The actual available value
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AvailableValue AV;
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static AvailableValueInBlock get(BasicBlock *BB, AvailableValue &&AV) {
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AvailableValueInBlock Res;
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Res.BB = BB;
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Res.AV = std::move(AV);
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return Res;
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}
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static AvailableValueInBlock get(BasicBlock *BB, Value *V,
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unsigned Offset = 0) {
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return get(BB, AvailableValue::get(V, Offset));
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}
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static AvailableValueInBlock getUndef(BasicBlock *BB) {
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return get(BB, AvailableValue::getUndef());
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}
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/// Emit code at the end of this block to adjust the value defined here to
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/// the specified type. This handles various coercion cases.
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Value *MaterializeAdjustedValue(LoadInst *LI, GVN &gvn) const {
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return AV.MaterializeAdjustedValue(LI, BB->getTerminator(), gvn);
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}
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};
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class GVN : public FunctionPass {
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bool NoLoads;
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MemoryDependenceResults *MD;
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DominatorTree *DT;
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const TargetLibraryInfo *TLI;
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AssumptionCache *AC;
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SetVector<BasicBlock *> DeadBlocks;
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ValueTable VN;
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/// A mapping from value numbers to lists of Value*'s that
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/// have that value number. Use findLeader to query it.
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struct LeaderTableEntry {
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Value *Val;
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const BasicBlock *BB;
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LeaderTableEntry *Next;
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};
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DenseMap<uint32_t, LeaderTableEntry> LeaderTable;
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BumpPtrAllocator TableAllocator;
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class GVN : public FunctionPass {
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bool NoLoads;
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MemoryDependenceResults *MD;
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DominatorTree *DT;
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const TargetLibraryInfo *TLI;
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AssumptionCache *AC;
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SetVector<BasicBlock *> DeadBlocks;
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// Block-local map of equivalent values to their leader, does not
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// propagate to any successors. Entries added mid-block are applied
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// to the remaining instructions in the block.
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SmallMapVector<llvm::Value *, llvm::Constant *, 4> ReplaceWithConstMap;
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SmallVector<Instruction *, 8> InstrsToErase;
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ValueTable VN;
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typedef SmallVector<NonLocalDepResult, 64> LoadDepVect;
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typedef SmallVector<AvailableValueInBlock, 64> AvailValInBlkVect;
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typedef SmallVector<BasicBlock *, 64> UnavailBlkVect;
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/// A mapping from value numbers to lists of Value*'s that
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/// have that value number. Use findLeader to query it.
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struct LeaderTableEntry {
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Value *Val;
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const BasicBlock *BB;
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LeaderTableEntry *Next;
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};
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DenseMap<uint32_t, LeaderTableEntry> LeaderTable;
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BumpPtrAllocator TableAllocator;
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public:
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static char ID; // Pass identification, replacement for typeid
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explicit GVN(bool noloads = false)
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: FunctionPass(ID), NoLoads(noloads), MD(nullptr) {
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initializeGVNPass(*PassRegistry::getPassRegistry());
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}
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// Block-local map of equivalent values to their leader, does not
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// propagate to any successors. Entries added mid-block are applied
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// to the remaining instructions in the block.
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SmallMapVector<llvm::Value *, llvm::Constant *, 4> ReplaceWithConstMap;
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SmallVector<Instruction*, 8> InstrsToErase;
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bool runOnFunction(Function &F) override;
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typedef SmallVector<NonLocalDepResult, 64> LoadDepVect;
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typedef SmallVector<AvailableValueInBlock, 64> AvailValInBlkVect;
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typedef SmallVector<BasicBlock*, 64> UnavailBlkVect;
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/// This removes the specified instruction from
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/// our various maps and marks it for deletion.
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void markInstructionForDeletion(Instruction *I) {
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VN.erase(I);
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InstrsToErase.push_back(I);
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}
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public:
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static char ID; // Pass identification, replacement for typeid
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explicit GVN(bool noloads = false)
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: FunctionPass(ID), NoLoads(noloads), MD(nullptr) {
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initializeGVNPass(*PassRegistry::getPassRegistry());
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DominatorTree &getDominatorTree() const { return *DT; }
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AliasAnalysis *getAliasAnalysis() const { return VN.getAliasAnalysis(); }
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MemoryDependenceResults &getMemDep() const { return *MD; }
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private:
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/// Push a new Value to the LeaderTable onto the list for its value number.
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void addToLeaderTable(uint32_t N, Value *V, const BasicBlock *BB) {
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LeaderTableEntry &Curr = LeaderTable[N];
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if (!Curr.Val) {
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Curr.Val = V;
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Curr.BB = BB;
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return;
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}
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bool runOnFunction(Function &F) override;
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LeaderTableEntry *Node = TableAllocator.Allocate<LeaderTableEntry>();
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Node->Val = V;
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Node->BB = BB;
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Node->Next = Curr.Next;
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Curr.Next = Node;
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}
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/// This removes the specified instruction from
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/// our various maps and marks it for deletion.
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void markInstructionForDeletion(Instruction *I) {
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VN.erase(I);
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InstrsToErase.push_back(I);
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/// Scan the list of values corresponding to a given
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/// value number, and remove the given instruction if encountered.
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void removeFromLeaderTable(uint32_t N, Instruction *I, BasicBlock *BB) {
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LeaderTableEntry *Prev = nullptr;
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LeaderTableEntry *Curr = &LeaderTable[N];
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while (Curr && (Curr->Val != I || Curr->BB != BB)) {
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Prev = Curr;
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Curr = Curr->Next;
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}
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DominatorTree &getDominatorTree() const { return *DT; }
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AliasAnalysis *getAliasAnalysis() const { return VN.getAliasAnalysis(); }
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MemoryDependenceResults &getMemDep() const { return *MD; }
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private:
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/// Push a new Value to the LeaderTable onto the list for its value number.
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void addToLeaderTable(uint32_t N, Value *V, const BasicBlock *BB) {
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LeaderTableEntry &Curr = LeaderTable[N];
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if (!Curr.Val) {
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Curr.Val = V;
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Curr.BB = BB;
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return;
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}
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if (!Curr)
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return;
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LeaderTableEntry *Node = TableAllocator.Allocate<LeaderTableEntry>();
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Node->Val = V;
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Node->BB = BB;
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Node->Next = Curr.Next;
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Curr.Next = Node;
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}
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/// Scan the list of values corresponding to a given
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/// value number, and remove the given instruction if encountered.
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void removeFromLeaderTable(uint32_t N, Instruction *I, BasicBlock *BB) {
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LeaderTableEntry* Prev = nullptr;
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LeaderTableEntry* Curr = &LeaderTable[N];
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while (Curr && (Curr->Val != I || Curr->BB != BB)) {
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Prev = Curr;
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Curr = Curr->Next;
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}
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if (!Curr)
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return;
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if (Prev) {
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Prev->Next = Curr->Next;
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if (Prev) {
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Prev->Next = Curr->Next;
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} else {
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if (!Curr->Next) {
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Curr->Val = nullptr;
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Curr->BB = nullptr;
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} else {
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if (!Curr->Next) {
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Curr->Val = nullptr;
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Curr->BB = nullptr;
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} else {
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LeaderTableEntry* Next = Curr->Next;
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Curr->Val = Next->Val;
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Curr->BB = Next->BB;
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Curr->Next = Next->Next;
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}
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LeaderTableEntry *Next = Curr->Next;
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Curr->Val = Next->Val;
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Curr->BB = Next->BB;
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Curr->Next = Next->Next;
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}
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}
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}
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// List of critical edges to be split between iterations.
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SmallVector<std::pair<TerminatorInst*, unsigned>, 4> toSplit;
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// List of critical edges to be split between iterations.
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SmallVector<std::pair<TerminatorInst *, unsigned>, 4> toSplit;
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// This transformation requires dominator postdominator info
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<AssumptionCacheTracker>();
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AU.addRequired<DominatorTreeWrapperPass>();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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if (!NoLoads)
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AU.addRequired<MemoryDependenceWrapperPass>();
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AU.addRequired<AAResultsWrapperPass>();
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// This transformation requires dominator postdominator info
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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AU.addRequired<AssumptionCacheTracker>();
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AU.addRequired<DominatorTreeWrapperPass>();
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AU.addRequired<TargetLibraryInfoWrapperPass>();
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if (!NoLoads)
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AU.addRequired<MemoryDependenceWrapperPass>();
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AU.addRequired<AAResultsWrapperPass>();
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AU.addPreserved<DominatorTreeWrapperPass>();
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AU.addPreserved<GlobalsAAWrapperPass>();
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}
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AU.addPreserved<DominatorTreeWrapperPass>();
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AU.addPreserved<GlobalsAAWrapperPass>();
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}
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// Helper functions of redundant load elimination
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bool processLoad(LoadInst *L);
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bool processNonLocalLoad(LoadInst *L);
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bool processAssumeIntrinsic(IntrinsicInst *II);
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/// Given a local dependency (Def or Clobber) determine if a value is
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/// available for the load. Returns true if an value is known to be
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/// available and populates Res. Returns false otherwise.
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bool AnalyzeLoadAvailability(LoadInst *LI, MemDepResult DepInfo,
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Value *Address, AvailableValue &Res);
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/// Given a list of non-local dependencies, determine if a value is
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/// available for the load in each specified block. If it is, add it to
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/// ValuesPerBlock. If not, add it to UnavailableBlocks.
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void AnalyzeLoadAvailability(LoadInst *LI, LoadDepVect &Deps,
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AvailValInBlkVect &ValuesPerBlock,
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UnavailBlkVect &UnavailableBlocks);
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bool PerformLoadPRE(LoadInst *LI, AvailValInBlkVect &ValuesPerBlock,
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UnavailBlkVect &UnavailableBlocks);
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// Helper functions of redundant load elimination
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bool processLoad(LoadInst *L);
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bool processNonLocalLoad(LoadInst *L);
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bool processAssumeIntrinsic(IntrinsicInst *II);
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/// Given a local dependency (Def or Clobber) determine if a value is
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/// available for the load. Returns true if an value is known to be
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/// available and populates Res. Returns false otherwise.
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bool AnalyzeLoadAvailability(LoadInst *LI, MemDepResult DepInfo,
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Value *Address, AvailableValue &Res);
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/// Given a list of non-local dependencies, determine if a value is
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/// available for the load in each specified block. If it is, add it to
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/// ValuesPerBlock. If not, add it to UnavailableBlocks.
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void AnalyzeLoadAvailability(LoadInst *LI, LoadDepVect &Deps,
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AvailValInBlkVect &ValuesPerBlock,
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UnavailBlkVect &UnavailableBlocks);
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bool PerformLoadPRE(LoadInst *LI, AvailValInBlkVect &ValuesPerBlock,
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UnavailBlkVect &UnavailableBlocks);
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// Other helper routines
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bool processInstruction(Instruction *I);
|
||||
bool processBlock(BasicBlock *BB);
|
||||
void dump(DenseMap<uint32_t, Value *> &d);
|
||||
bool iterateOnFunction(Function &F);
|
||||
bool performPRE(Function &F);
|
||||
bool performScalarPRE(Instruction *I);
|
||||
bool performScalarPREInsertion(Instruction *Instr, BasicBlock *Pred,
|
||||
unsigned int ValNo);
|
||||
Value *findLeader(const BasicBlock *BB, uint32_t num);
|
||||
void cleanupGlobalSets();
|
||||
void verifyRemoved(const Instruction *I) const;
|
||||
bool splitCriticalEdges();
|
||||
BasicBlock *splitCriticalEdges(BasicBlock *Pred, BasicBlock *Succ);
|
||||
bool replaceOperandsWithConsts(Instruction *I) const;
|
||||
bool propagateEquality(Value *LHS, Value *RHS, const BasicBlockEdge &Root,
|
||||
bool DominatesByEdge);
|
||||
bool processFoldableCondBr(BranchInst *BI);
|
||||
void addDeadBlock(BasicBlock *BB);
|
||||
void assignValNumForDeadCode();
|
||||
};
|
||||
|
||||
// Other helper routines
|
||||
bool processInstruction(Instruction *I);
|
||||
bool processBlock(BasicBlock *BB);
|
||||
void dump(DenseMap<uint32_t, Value*> &d);
|
||||
bool iterateOnFunction(Function &F);
|
||||
bool performPRE(Function &F);
|
||||
bool performScalarPRE(Instruction *I);
|
||||
bool performScalarPREInsertion(Instruction *Instr, BasicBlock *Pred,
|
||||
unsigned int ValNo);
|
||||
Value *findLeader(const BasicBlock *BB, uint32_t num);
|
||||
void cleanupGlobalSets();
|
||||
void verifyRemoved(const Instruction *I) const;
|
||||
bool splitCriticalEdges();
|
||||
BasicBlock *splitCriticalEdges(BasicBlock *Pred, BasicBlock *Succ);
|
||||
bool replaceOperandsWithConsts(Instruction *I) const;
|
||||
bool propagateEquality(Value *LHS, Value *RHS, const BasicBlockEdge &Root,
|
||||
bool DominatesByEdge);
|
||||
bool processFoldableCondBr(BranchInst *BI);
|
||||
void addDeadBlock(BasicBlock *BB);
|
||||
void assignValNumForDeadCode();
|
||||
};
|
||||
char GVN::ID = 0;
|
||||
|
||||
char GVN::ID = 0;
|
||||
}
|
||||
} // End anonymous namespace.
|
||||
|
||||
// The public interface to this file...
|
||||
FunctionPass *llvm::createGVNPass(bool NoLoads) {
|
||||
|
||||
Loading…
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Reference in New Issue
Block a user