// "Loop-Aware SLP in GCC" by Ira Rosen, Dorit Nuzman, Ayal Zaks.
//
//===----------------------------------------------------------------------===//
-#define SV_NAME "slp-vectorizer"
-#define DEBUG_TYPE "SLP"
-
#include "llvm/Transforms/Vectorize.h"
#include "llvm/ADT/MapVector.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
+#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/CodeMetrics.h"
+#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/ScalarEvolution.h"
#include "llvm/Analysis/ScalarEvolutionExpressions.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/ValueTracking.h"
-#include "llvm/Analysis/Verifier.h"
-#include "llvm/Analysis/LoopInfo.h"
#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/Dominators.h"
+#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
-#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Module.h"
+#include "llvm/IR/NoFolder.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Value.h"
+#include "llvm/IR/Verifier.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
+#include "llvm/Transforms/Utils/VectorUtils.h"
#include <algorithm>
#include <map>
+#include <memory>
using namespace llvm;
+#define SV_NAME "slp-vectorizer"
+#define DEBUG_TYPE "SLP"
+
+STATISTIC(NumVectorInstructions, "Number of vector instructions generated");
+
static cl::opt<int>
SLPCostThreshold("slp-threshold", cl::init(0), cl::Hidden,
cl::desc("Only vectorize if you gain more than this "
static const unsigned RecursionMaxDepth = 12;
-/// A helper class for numbering instructions in multiple blocks.
-/// Numbers start at zero for each basic block.
-struct BlockNumbering {
-
- BlockNumbering(BasicBlock *Bb) : BB(Bb), Valid(false) {}
-
- BlockNumbering() : BB(0), Valid(false) {}
-
- void numberInstructions() {
- unsigned Loc = 0;
- InstrIdx.clear();
- InstrVec.clear();
- // Number the instructions in the block.
- for (BasicBlock::iterator it = BB->begin(), e = BB->end(); it != e; ++it) {
- InstrIdx[it] = Loc++;
- InstrVec.push_back(it);
- assert(InstrVec[InstrIdx[it]] == it && "Invalid allocation");
- }
- Valid = true;
- }
-
- int getIndex(Instruction *I) {
- assert(I->getParent() == BB && "Invalid instruction");
- if (!Valid)
- numberInstructions();
- assert(InstrIdx.count(I) && "Unknown instruction");
- return InstrIdx[I];
- }
-
- Instruction *getInstruction(unsigned loc) {
- if (!Valid)
- numberInstructions();
- assert(InstrVec.size() > loc && "Invalid Index");
- return InstrVec[loc];
- }
-
- void forget() { Valid = false; }
-
-private:
- /// The block we are numbering.
- BasicBlock *BB;
- /// Is the block numbered.
- bool Valid;
- /// Maps instructions to numbers and back.
- SmallDenseMap<Instruction *, int> InstrIdx;
- /// Maps integers to Instructions.
- SmallVector<Instruction *, 32> InstrVec;
-};
-
/// \returns the parent basic block if all of the instructions in \p VL
/// are in the same block or null otherwise.
static BasicBlock *getSameBlock(ArrayRef<Value *> VL) {
Instruction *I0 = dyn_cast<Instruction>(VL[0]);
if (!I0)
- return 0;
+ return nullptr;
BasicBlock *BB = I0->getParent();
for (int i = 1, e = VL.size(); i < e; i++) {
Instruction *I = dyn_cast<Instruction>(VL[i]);
if (!I)
- return 0;
+ return nullptr;
if (BB != I->getParent())
- return 0;
+ return nullptr;
}
return BB;
}
return true;
}
+///\returns Opcode that can be clubbed with \p Op to create an alternate
+/// sequence which can later be merged as a ShuffleVector instruction.
+static unsigned getAltOpcode(unsigned Op) {
+ switch (Op) {
+ case Instruction::FAdd:
+ return Instruction::FSub;
+ case Instruction::FSub:
+ return Instruction::FAdd;
+ case Instruction::Add:
+ return Instruction::Sub;
+ case Instruction::Sub:
+ return Instruction::Add;
+ default:
+ return 0;
+ }
+}
+
+///\returns bool representing if Opcode \p Op can be part
+/// of an alternate sequence which can later be merged as
+/// a ShuffleVector instruction.
+static bool canCombineAsAltInst(unsigned Op) {
+ if (Op == Instruction::FAdd || Op == Instruction::FSub ||
+ Op == Instruction::Sub || Op == Instruction::Add)
+ return true;
+ return false;
+}
+
+/// \returns ShuffleVector instruction if intructions in \p VL have
+/// alternate fadd,fsub / fsub,fadd/add,sub/sub,add sequence.
+/// (i.e. e.g. opcodes of fadd,fsub,fadd,fsub...)
+static unsigned isAltInst(ArrayRef<Value *> VL) {
+ Instruction *I0 = dyn_cast<Instruction>(VL[0]);
+ unsigned Opcode = I0->getOpcode();
+ unsigned AltOpcode = getAltOpcode(Opcode);
+ for (int i = 1, e = VL.size(); i < e; i++) {
+ Instruction *I = dyn_cast<Instruction>(VL[i]);
+ if (!I || I->getOpcode() != ((i & 1) ? AltOpcode : Opcode))
+ return 0;
+ }
+ return Instruction::ShuffleVector;
+}
+
/// \returns The opcode if all of the Instructions in \p VL have the same
/// opcode, or zero.
static unsigned getSameOpcode(ArrayRef<Value *> VL) {
unsigned Opcode = I0->getOpcode();
for (int i = 1, e = VL.size(); i < e; i++) {
Instruction *I = dyn_cast<Instruction>(VL[i]);
- if (!I || Opcode != I->getOpcode())
+ if (!I || Opcode != I->getOpcode()) {
+ if (canCombineAsAltInst(Opcode) && i == 1)
+ return isAltInst(VL);
return 0;
+ }
}
return Opcode;
}
+/// Get the intersection (logical and) of all of the potential IR flags
+/// of each scalar operation (VL) that will be converted into a vector (I).
+/// Flag set: NSW, NUW, exact, and all of fast-math.
+static void propagateIRFlags(Value *I, ArrayRef<Value *> VL) {
+ if (auto *VecOp = dyn_cast<BinaryOperator>(I)) {
+ if (auto *Intersection = dyn_cast<BinaryOperator>(VL[0])) {
+ // Intersection is initialized to the 0th scalar,
+ // so start counting from index '1'.
+ for (int i = 1, e = VL.size(); i < e; ++i) {
+ if (auto *Scalar = dyn_cast<BinaryOperator>(VL[i]))
+ Intersection->andIRFlags(Scalar);
+ }
+ VecOp->copyIRFlags(Intersection);
+ }
+ }
+}
+
/// \returns \p I after propagating metadata from \p VL.
static Instruction *propagateMetadata(Instruction *I, ArrayRef<Value *> VL) {
Instruction *I0 = cast<Instruction>(VL[0]);
switch (Kind) {
default:
- MD = 0; // Remove unknown metadata
+ MD = nullptr; // Remove unknown metadata
break;
case LLVMContext::MD_tbaa:
MD = MDNode::getMostGenericTBAA(MD, IMD);
break;
+ case LLVMContext::MD_alias_scope:
+ case LLVMContext::MD_noalias:
+ MD = MDNode::intersect(MD, IMD);
+ break;
case LLVMContext::MD_fpmath:
MD = MDNode::getMostGenericFPMath(MD, IMD);
break;
Type *Ty = VL[0]->getType();
for (int i = 1, e = VL.size(); i < e; i++)
if (VL[i]->getType() != Ty)
- return 0;
+ return nullptr;
return Ty;
}
}
}
+/// \returns True if in-tree use also needs extract. This refers to
+/// possible scalar operand in vectorized instruction.
+static bool InTreeUserNeedToExtract(Value *Scalar, Instruction *UserInst,
+ TargetLibraryInfo *TLI) {
+
+ unsigned Opcode = UserInst->getOpcode();
+ switch (Opcode) {
+ case Instruction::Load: {
+ LoadInst *LI = cast<LoadInst>(UserInst);
+ return (LI->getPointerOperand() == Scalar);
+ }
+ case Instruction::Store: {
+ StoreInst *SI = cast<StoreInst>(UserInst);
+ return (SI->getPointerOperand() == Scalar);
+ }
+ case Instruction::Call: {
+ CallInst *CI = cast<CallInst>(UserInst);
+ Intrinsic::ID ID = getIntrinsicIDForCall(CI, TLI);
+ if (hasVectorInstrinsicScalarOpd(ID, 1)) {
+ return (CI->getArgOperand(1) == Scalar);
+ }
+ }
+ default:
+ return false;
+ }
+}
+
+/// \returns the AA location that is being access by the instruction.
+static AliasAnalysis::Location getLocation(Instruction *I, AliasAnalysis *AA) {
+ if (StoreInst *SI = dyn_cast<StoreInst>(I))
+ return AA->getLocation(SI);
+ if (LoadInst *LI = dyn_cast<LoadInst>(I))
+ return AA->getLocation(LI);
+ return AliasAnalysis::Location();
+}
+
/// Bottom Up SLP Vectorizer.
class BoUpSLP {
public:
typedef SmallPtrSet<Value *, 16> ValueSet;
typedef SmallVector<StoreInst *, 8> StoreList;
- BoUpSLP(Function *Func, ScalarEvolution *Se, DataLayout *Dl,
- TargetTransformInfo *Tti, AliasAnalysis *Aa, LoopInfo *Li,
- DominatorTree *Dt) :
- F(Func), SE(Se), DL(Dl), TTI(Tti), AA(Aa), LI(Li), DT(Dt),
- Builder(Se->getContext()) {
- // Setup the block numbering utility for all of the blocks in the
- // function.
- for (Function::iterator it = F->begin(), e = F->end(); it != e; ++it) {
- BasicBlock *BB = it;
- BlocksNumbers[BB] = BlockNumbering(BB);
- }
- }
+ BoUpSLP(Function *Func, ScalarEvolution *Se, const DataLayout *Dl,
+ TargetTransformInfo *Tti, TargetLibraryInfo *TLi, AliasAnalysis *Aa,
+ LoopInfo *Li, DominatorTree *Dt, AssumptionCache *AC)
+ : NumLoadsWantToKeepOrder(0), NumLoadsWantToChangeOrder(0), F(Func),
+ SE(Se), DL(Dl), TTI(Tti), TLI(TLi), AA(Aa), LI(Li), DT(Dt),
+ Builder(Se->getContext()) {
+ CodeMetrics::collectEphemeralValues(F, AC, EphValues);
+ }
/// \brief Vectorize the tree that starts with the elements in \p VL.
/// Returns the vectorized root.
Value *vectorizeTree();
+ /// \returns the cost incurred by unwanted spills and fills, caused by
+ /// holding live values over call sites.
+ int getSpillCost();
+
/// \returns the vectorization cost of the subtree that starts at \p VL.
/// A negative number means that this is profitable.
int getTreeCost();
- /// Construct a vectorizable tree that starts at \p Roots and is possibly
- /// used by a reduction of \p RdxOps.
- void buildTree(ArrayRef<Value *> Roots, ValueSet *RdxOps = 0);
+ /// Construct a vectorizable tree that starts at \p Roots, ignoring users for
+ /// the purpose of scheduling and extraction in the \p UserIgnoreLst.
+ void buildTree(ArrayRef<Value *> Roots,
+ ArrayRef<Value *> UserIgnoreLst = None);
/// Clear the internal data structures that are created by 'buildTree'.
void deleteTree() {
- RdxOps = 0;
VectorizableTree.clear();
ScalarToTreeEntry.clear();
MustGather.clear();
ExternalUses.clear();
- MemBarrierIgnoreList.clear();
+ NumLoadsWantToKeepOrder = 0;
+ NumLoadsWantToChangeOrder = 0;
+ for (auto &Iter : BlocksSchedules) {
+ BlockScheduling *BS = Iter.second.get();
+ BS->clear();
+ }
}
/// \returns true if the memory operations A and B are consecutive.
/// \brief Perform LICM and CSE on the newly generated gather sequences.
void optimizeGatherSequence();
+
+ /// \returns true if it is benefitial to reverse the vector order.
+ bool shouldReorder() const {
+ return NumLoadsWantToChangeOrder > NumLoadsWantToKeepOrder;
+ }
+
private:
struct TreeEntry;
/// roots. This method calculates the cost of extracting the values.
int getGatherCost(ArrayRef<Value *> VL);
- /// \returns the AA location that is being access by the instruction.
- AliasAnalysis::Location getLocation(Instruction *I);
-
- /// \brief Checks if it is possible to sink an instruction from
- /// \p Src to \p Dst.
- /// \returns the pointer to the barrier instruction if we can't sink.
- Value *getSinkBarrier(Instruction *Src, Instruction *Dst);
-
- /// \returns the index of the last instruction in the BB from \p VL.
- int getLastIndex(ArrayRef<Value *> VL);
-
- /// \returns the Instruction in the bundle \p VL.
- Instruction *getLastInstruction(ArrayRef<Value *> VL);
-
/// \brief Set the Builder insert point to one after the last instruction in
/// the bundle
void setInsertPointAfterBundle(ArrayRef<Value *> VL);
bool isFullyVectorizableTinyTree();
struct TreeEntry {
- TreeEntry() : Scalars(), VectorizedValue(0), LastScalarIndex(0),
+ TreeEntry() : Scalars(), VectorizedValue(nullptr),
NeedToGather(0) {}
/// \returns true if the scalars in VL are equal to this entry.
/// The Scalars are vectorized into this value. It is initialized to Null.
Value *VectorizedValue;
- /// The index in the basic block of the last scalar.
- int LastScalarIndex;
-
/// Do we need to gather this sequence ?
bool NeedToGather;
};
Last->Scalars.insert(Last->Scalars.begin(), VL.begin(), VL.end());
Last->NeedToGather = !Vectorized;
if (Vectorized) {
- Last->LastScalarIndex = getLastIndex(VL);
for (int i = 0, e = VL.size(); i != e; ++i) {
assert(!ScalarToTreeEntry.count(VL[i]) && "Scalar already in tree!");
ScalarToTreeEntry[VL[i]] = idx;
}
} else {
- Last->LastScalarIndex = 0;
MustGather.insert(VL.begin(), VL.end());
}
return Last;
}
-
+
/// -- Vectorization State --
/// Holds all of the tree entries.
std::vector<TreeEntry> VectorizableTree;
};
typedef SmallVector<ExternalUser, 16> UserList;
+ /// Checks if two instructions may access the same memory.
+ ///
+ /// \p Loc1 is the location of \p Inst1. It is passed explicitly because it
+ /// is invariant in the calling loop.
+ bool isAliased(const AliasAnalysis::Location &Loc1, Instruction *Inst1,
+ Instruction *Inst2) {
+
+ // First check if the result is already in the cache.
+ AliasCacheKey key = std::make_pair(Inst1, Inst2);
+ Optional<bool> &result = AliasCache[key];
+ if (result.hasValue()) {
+ return result.getValue();
+ }
+ AliasAnalysis::Location Loc2 = getLocation(Inst2, AA);
+ bool aliased = true;
+ if (Loc1.Ptr && Loc2.Ptr) {
+ // Do the alias check.
+ aliased = AA->alias(Loc1, Loc2);
+ }
+ // Store the result in the cache.
+ result = aliased;
+ return aliased;
+ }
+
+ typedef std::pair<Instruction *, Instruction *> AliasCacheKey;
+
+ /// Cache for alias results.
+ DenseMap<AliasCacheKey, Optional<bool>> AliasCache;
+
/// A list of values that need to extracted out of the tree.
/// This list holds pairs of (Internal Scalar : External User).
UserList ExternalUses;
- /// A list of instructions to ignore while sinking
- /// memory instructions. This map must be reset between runs of getCost.
- ValueSet MemBarrierIgnoreList;
+ /// Values used only by @llvm.assume calls.
+ SmallPtrSet<const Value *, 32> EphValues;
/// Holds all of the instructions that we gathered.
SetVector<Instruction *> GatherSeq;
+ /// A list of blocks that we are going to CSE.
+ SetVector<BasicBlock *> CSEBlocks;
+
+ /// Contains all scheduling relevant data for an instruction.
+ /// A ScheduleData either represents a single instruction or a member of an
+ /// instruction bundle (= a group of instructions which is combined into a
+ /// vector instruction).
+ struct ScheduleData {
+
+ // The initial value for the dependency counters. It means that the
+ // dependencies are not calculated yet.
+ enum { InvalidDeps = -1 };
+
+ ScheduleData()
+ : Inst(nullptr), FirstInBundle(nullptr), NextInBundle(nullptr),
+ NextLoadStore(nullptr), SchedulingRegionID(0), SchedulingPriority(0),
+ Dependencies(InvalidDeps), UnscheduledDeps(InvalidDeps),
+ UnscheduledDepsInBundle(InvalidDeps), IsScheduled(false) {}
+
+ void init(int BlockSchedulingRegionID) {
+ FirstInBundle = this;
+ NextInBundle = nullptr;
+ NextLoadStore = nullptr;
+ IsScheduled = false;
+ SchedulingRegionID = BlockSchedulingRegionID;
+ UnscheduledDepsInBundle = UnscheduledDeps;
+ clearDependencies();
+ }
+
+ /// Returns true if the dependency information has been calculated.
+ bool hasValidDependencies() const { return Dependencies != InvalidDeps; }
+
+ /// Returns true for single instructions and for bundle representatives
+ /// (= the head of a bundle).
+ bool isSchedulingEntity() const { return FirstInBundle == this; }
+
+ /// Returns true if it represents an instruction bundle and not only a
+ /// single instruction.
+ bool isPartOfBundle() const {
+ return NextInBundle != nullptr || FirstInBundle != this;
+ }
+
+ /// Returns true if it is ready for scheduling, i.e. it has no more
+ /// unscheduled depending instructions/bundles.
+ bool isReady() const {
+ assert(isSchedulingEntity() &&
+ "can't consider non-scheduling entity for ready list");
+ return UnscheduledDepsInBundle == 0 && !IsScheduled;
+ }
+
+ /// Modifies the number of unscheduled dependencies, also updating it for
+ /// the whole bundle.
+ int incrementUnscheduledDeps(int Incr) {
+ UnscheduledDeps += Incr;
+ return FirstInBundle->UnscheduledDepsInBundle += Incr;
+ }
+
+ /// Sets the number of unscheduled dependencies to the number of
+ /// dependencies.
+ void resetUnscheduledDeps() {
+ incrementUnscheduledDeps(Dependencies - UnscheduledDeps);
+ }
+
+ /// Clears all dependency information.
+ void clearDependencies() {
+ Dependencies = InvalidDeps;
+ resetUnscheduledDeps();
+ MemoryDependencies.clear();
+ }
+
+ void dump(raw_ostream &os) const {
+ if (!isSchedulingEntity()) {
+ os << "/ " << *Inst;
+ } else if (NextInBundle) {
+ os << '[' << *Inst;
+ ScheduleData *SD = NextInBundle;
+ while (SD) {
+ os << ';' << *SD->Inst;
+ SD = SD->NextInBundle;
+ }
+ os << ']';
+ } else {
+ os << *Inst;
+ }
+ }
+
+ Instruction *Inst;
+
+ /// Points to the head in an instruction bundle (and always to this for
+ /// single instructions).
+ ScheduleData *FirstInBundle;
+
+ /// Single linked list of all instructions in a bundle. Null if it is a
+ /// single instruction.
+ ScheduleData *NextInBundle;
+
+ /// Single linked list of all memory instructions (e.g. load, store, call)
+ /// in the block - until the end of the scheduling region.
+ ScheduleData *NextLoadStore;
+
+ /// The dependent memory instructions.
+ /// This list is derived on demand in calculateDependencies().
+ SmallVector<ScheduleData *, 4> MemoryDependencies;
+
+ /// This ScheduleData is in the current scheduling region if this matches
+ /// the current SchedulingRegionID of BlockScheduling.
+ int SchedulingRegionID;
+
+ /// Used for getting a "good" final ordering of instructions.
+ int SchedulingPriority;
+
+ /// The number of dependencies. Constitutes of the number of users of the
+ /// instruction plus the number of dependent memory instructions (if any).
+ /// This value is calculated on demand.
+ /// If InvalidDeps, the number of dependencies is not calculated yet.
+ ///
+ int Dependencies;
+
+ /// The number of dependencies minus the number of dependencies of scheduled
+ /// instructions. As soon as this is zero, the instruction/bundle gets ready
+ /// for scheduling.
+ /// Note that this is negative as long as Dependencies is not calculated.
+ int UnscheduledDeps;
- /// Numbers instructions in different blocks.
- DenseMap<BasicBlock *, BlockNumbering> BlocksNumbers;
+ /// The sum of UnscheduledDeps in a bundle. Equals to UnscheduledDeps for
+ /// single instructions.
+ int UnscheduledDepsInBundle;
+
+ /// True if this instruction is scheduled (or considered as scheduled in the
+ /// dry-run).
+ bool IsScheduled;
+ };
+
+#ifndef NDEBUG
+ friend raw_ostream &operator<<(raw_ostream &os,
+ const BoUpSLP::ScheduleData &SD);
+#endif
+
+ /// Contains all scheduling data for a basic block.
+ ///
+ struct BlockScheduling {
+
+ BlockScheduling(BasicBlock *BB)
+ : BB(BB), ChunkSize(BB->size()), ChunkPos(ChunkSize),
+ ScheduleStart(nullptr), ScheduleEnd(nullptr),
+ FirstLoadStoreInRegion(nullptr), LastLoadStoreInRegion(nullptr),
+ // Make sure that the initial SchedulingRegionID is greater than the
+ // initial SchedulingRegionID in ScheduleData (which is 0).
+ SchedulingRegionID(1) {}
+
+ void clear() {
+ ReadyInsts.clear();
+ ScheduleStart = nullptr;
+ ScheduleEnd = nullptr;
+ FirstLoadStoreInRegion = nullptr;
+ LastLoadStoreInRegion = nullptr;
+
+ // Make a new scheduling region, i.e. all existing ScheduleData is not
+ // in the new region yet.
+ ++SchedulingRegionID;
+ }
+
+ ScheduleData *getScheduleData(Value *V) {
+ ScheduleData *SD = ScheduleDataMap[V];
+ if (SD && SD->SchedulingRegionID == SchedulingRegionID)
+ return SD;
+ return nullptr;
+ }
+
+ bool isInSchedulingRegion(ScheduleData *SD) {
+ return SD->SchedulingRegionID == SchedulingRegionID;
+ }
+
+ /// Marks an instruction as scheduled and puts all dependent ready
+ /// instructions into the ready-list.
+ template <typename ReadyListType>
+ void schedule(ScheduleData *SD, ReadyListType &ReadyList) {
+ SD->IsScheduled = true;
+ DEBUG(dbgs() << "SLP: schedule " << *SD << "\n");
+
+ ScheduleData *BundleMember = SD;
+ while (BundleMember) {
+ // Handle the def-use chain dependencies.
+ for (Use &U : BundleMember->Inst->operands()) {
+ ScheduleData *OpDef = getScheduleData(U.get());
+ if (OpDef && OpDef->hasValidDependencies() &&
+ OpDef->incrementUnscheduledDeps(-1) == 0) {
+ // There are no more unscheduled dependencies after decrementing,
+ // so we can put the dependent instruction into the ready list.
+ ScheduleData *DepBundle = OpDef->FirstInBundle;
+ assert(!DepBundle->IsScheduled &&
+ "already scheduled bundle gets ready");
+ ReadyList.insert(DepBundle);
+ DEBUG(dbgs() << "SLP: gets ready (def): " << *DepBundle << "\n");
+ }
+ }
+ // Handle the memory dependencies.
+ for (ScheduleData *MemoryDepSD : BundleMember->MemoryDependencies) {
+ if (MemoryDepSD->incrementUnscheduledDeps(-1) == 0) {
+ // There are no more unscheduled dependencies after decrementing,
+ // so we can put the dependent instruction into the ready list.
+ ScheduleData *DepBundle = MemoryDepSD->FirstInBundle;
+ assert(!DepBundle->IsScheduled &&
+ "already scheduled bundle gets ready");
+ ReadyList.insert(DepBundle);
+ DEBUG(dbgs() << "SLP: gets ready (mem): " << *DepBundle << "\n");
+ }
+ }
+ BundleMember = BundleMember->NextInBundle;
+ }
+ }
+
+ /// Put all instructions into the ReadyList which are ready for scheduling.
+ template <typename ReadyListType>
+ void initialFillReadyList(ReadyListType &ReadyList) {
+ for (auto *I = ScheduleStart; I != ScheduleEnd; I = I->getNextNode()) {
+ ScheduleData *SD = getScheduleData(I);
+ if (SD->isSchedulingEntity() && SD->isReady()) {
+ ReadyList.insert(SD);
+ DEBUG(dbgs() << "SLP: initially in ready list: " << *I << "\n");
+ }
+ }
+ }
+
+ /// Checks if a bundle of instructions can be scheduled, i.e. has no
+ /// cyclic dependencies. This is only a dry-run, no instructions are
+ /// actually moved at this stage.
+ bool tryScheduleBundle(ArrayRef<Value *> VL, BoUpSLP *SLP);
+
+ /// Un-bundles a group of instructions.
+ void cancelScheduling(ArrayRef<Value *> VL);
+
+ /// Extends the scheduling region so that V is inside the region.
+ void extendSchedulingRegion(Value *V);
+
+ /// Initialize the ScheduleData structures for new instructions in the
+ /// scheduling region.
+ void initScheduleData(Instruction *FromI, Instruction *ToI,
+ ScheduleData *PrevLoadStore,
+ ScheduleData *NextLoadStore);
+
+ /// Updates the dependency information of a bundle and of all instructions/
+ /// bundles which depend on the original bundle.
+ void calculateDependencies(ScheduleData *SD, bool InsertInReadyList,
+ BoUpSLP *SLP);
+
+ /// Sets all instruction in the scheduling region to un-scheduled.
+ void resetSchedule();
+
+ BasicBlock *BB;
+
+ /// Simple memory allocation for ScheduleData.
+ std::vector<std::unique_ptr<ScheduleData[]>> ScheduleDataChunks;
+
+ /// The size of a ScheduleData array in ScheduleDataChunks.
+ int ChunkSize;
+
+ /// The allocator position in the current chunk, which is the last entry
+ /// of ScheduleDataChunks.
+ int ChunkPos;
+
+ /// Attaches ScheduleData to Instruction.
+ /// Note that the mapping survives during all vectorization iterations, i.e.
+ /// ScheduleData structures are recycled.
+ DenseMap<Value *, ScheduleData *> ScheduleDataMap;
+
+ struct ReadyList : SmallVector<ScheduleData *, 8> {
+ void insert(ScheduleData *SD) { push_back(SD); }
+ };
+
+ /// The ready-list for scheduling (only used for the dry-run).
+ ReadyList ReadyInsts;
+
+ /// The first instruction of the scheduling region.
+ Instruction *ScheduleStart;
+
+ /// The first instruction _after_ the scheduling region.
+ Instruction *ScheduleEnd;
+
+ /// The first memory accessing instruction in the scheduling region
+ /// (can be null).
+ ScheduleData *FirstLoadStoreInRegion;
+
+ /// The last memory accessing instruction in the scheduling region
+ /// (can be null).
+ ScheduleData *LastLoadStoreInRegion;
+
+ /// The ID of the scheduling region. For a new vectorization iteration this
+ /// is incremented which "removes" all ScheduleData from the region.
+ int SchedulingRegionID;
+ };
- /// Reduction operators.
- ValueSet *RdxOps;
+ /// Attaches the BlockScheduling structures to basic blocks.
+ DenseMap<BasicBlock *, std::unique_ptr<BlockScheduling>> BlocksSchedules;
+
+ /// Performs the "real" scheduling. Done before vectorization is actually
+ /// performed in a basic block.
+ void scheduleBlock(BlockScheduling *BS);
+
+ /// List of users to ignore during scheduling and that don't need extracting.
+ ArrayRef<Value *> UserIgnoreList;
+
+ // Number of load-bundles, which contain consecutive loads.
+ int NumLoadsWantToKeepOrder;
+
+ // Number of load-bundles of size 2, which are consecutive loads if reversed.
+ int NumLoadsWantToChangeOrder;
// Analysis and block reference.
Function *F;
ScalarEvolution *SE;
- DataLayout *DL;
+ const DataLayout *DL;
TargetTransformInfo *TTI;
+ TargetLibraryInfo *TLI;
AliasAnalysis *AA;
LoopInfo *LI;
DominatorTree *DT;
IRBuilder<> Builder;
};
-void BoUpSLP::buildTree(ArrayRef<Value *> Roots, ValueSet *Rdx) {
+#ifndef NDEBUG
+raw_ostream &operator<<(raw_ostream &os, const BoUpSLP::ScheduleData &SD) {
+ SD.dump(os);
+ return os;
+}
+#endif
+
+void BoUpSLP::buildTree(ArrayRef<Value *> Roots,
+ ArrayRef<Value *> UserIgnoreLst) {
deleteTree();
- RdxOps = Rdx;
+ UserIgnoreList = UserIgnoreLst;
if (!getSameType(Roots))
return;
buildTree_rec(Roots, 0);
if (Entry->NeedToGather)
continue;
- for (Value::use_iterator User = Scalar->use_begin(),
- UE = Scalar->use_end(); User != UE; ++User) {
- DEBUG(dbgs() << "SLP: Checking user:" << **User << ".\n");
-
- bool Gathered = MustGather.count(*User);
+ for (User *U : Scalar->users()) {
+ DEBUG(dbgs() << "SLP: Checking user:" << *U << ".\n");
- // Skip in-tree scalars that become vectors.
- if (ScalarToTreeEntry.count(*User) && !Gathered) {
- DEBUG(dbgs() << "SLP: \tInternal user will be removed:" <<
- **User << ".\n");
- int Idx = ScalarToTreeEntry[*User]; (void) Idx;
- assert(!VectorizableTree[Idx].NeedToGather && "Bad state");
- continue;
- }
- Instruction *UserInst = dyn_cast<Instruction>(*User);
+ Instruction *UserInst = dyn_cast<Instruction>(U);
if (!UserInst)
continue;
- // Ignore uses that are part of the reduction.
- if (Rdx && std::find(Rdx->begin(), Rdx->end(), UserInst) != Rdx->end())
+ // Skip in-tree scalars that become vectors
+ if (ScalarToTreeEntry.count(U)) {
+ int Idx = ScalarToTreeEntry[U];
+ TreeEntry *UseEntry = &VectorizableTree[Idx];
+ Value *UseScalar = UseEntry->Scalars[0];
+ // Some in-tree scalars will remain as scalar in vectorized
+ // instructions. If that is the case, the one in Lane 0 will
+ // be used.
+ if (UseScalar != U ||
+ !InTreeUserNeedToExtract(Scalar, UserInst, TLI)) {
+ DEBUG(dbgs() << "SLP: \tInternal user will be removed:" << *U
+ << ".\n");
+ assert(!VectorizableTree[Idx].NeedToGather && "Bad state");
+ continue;
+ }
+ }
+
+ // Ignore users in the user ignore list.
+ if (std::find(UserIgnoreList.begin(), UserIgnoreList.end(), UserInst) !=
+ UserIgnoreList.end())
continue;
- DEBUG(dbgs() << "SLP: Need to extract:" << **User << " from lane " <<
+ DEBUG(dbgs() << "SLP: Need to extract:" << *U << " from lane " <<
Lane << " from " << *Scalar << ".\n");
- ExternalUses.push_back(ExternalUser(Scalar, *User, Lane));
+ ExternalUses.push_back(ExternalUser(Scalar, U, Lane));
}
}
}
void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
bool SameTy = getSameType(VL); (void)SameTy;
+ bool isAltShuffle = false;
assert(SameTy && "Invalid types!");
if (Depth == RecursionMaxDepth) {
newTreeEntry(VL, false);
return;
}
+ unsigned Opcode = getSameOpcode(VL);
+
+ // Check that this shuffle vector refers to the alternate
+ // sequence of opcodes.
+ if (Opcode == Instruction::ShuffleVector) {
+ Instruction *I0 = dyn_cast<Instruction>(VL[0]);
+ unsigned Op = I0->getOpcode();
+ if (Op != Instruction::ShuffleVector)
+ isAltShuffle = true;
+ }
// If all of the operands are identical or constant we have a simple solution.
- if (allConstant(VL) || isSplat(VL) || !getSameBlock(VL) ||
- !getSameOpcode(VL)) {
+ if (allConstant(VL) || isSplat(VL) || !getSameBlock(VL) || !Opcode) {
DEBUG(dbgs() << "SLP: Gathering due to C,S,B,O. \n");
newTreeEntry(VL, false);
return;
// We now know that this is a vector of instructions of the same type from
// the same block.
+ // Don't vectorize ephemeral values.
+ for (unsigned i = 0, e = VL.size(); i != e; ++i) {
+ if (EphValues.count(VL[i])) {
+ DEBUG(dbgs() << "SLP: The instruction (" << *VL[i] <<
+ ") is ephemeral.\n");
+ newTreeEntry(VL, false);
+ return;
+ }
+ }
+
// Check if this is a duplicate of another entry.
if (ScalarToTreeEntry.count(VL[0])) {
int Idx = ScalarToTreeEntry[VL[0]];
}
}
- // If any of the scalars appears in the table OR it is marked as a value that
- // needs to stat scalar then we need to gather the scalars.
+ // If any of the scalars is marked as a value that needs to stay scalar then
+ // we need to gather the scalars.
for (unsigned i = 0, e = VL.size(); i != e; ++i) {
- if (ScalarToTreeEntry.count(VL[i]) || MustGather.count(VL[i])) {
- DEBUG(dbgs() << "SLP: Gathering due to gathered scalar. \n");
+ if (MustGather.count(VL[i])) {
+ DEBUG(dbgs() << "SLP: Gathering due to gathered scalar.\n");
newTreeEntry(VL, false);
return;
}
// Check that all of the users of the scalars that we want to vectorize are
// schedulable.
Instruction *VL0 = cast<Instruction>(VL[0]);
- int MyLastIndex = getLastIndex(VL);
BasicBlock *BB = cast<Instruction>(VL0)->getParent();
- for (unsigned i = 0, e = VL.size(); i != e; ++i) {
- Instruction *Scalar = cast<Instruction>(VL[i]);
- DEBUG(dbgs() << "SLP: Checking users of " << *Scalar << ". \n");
- for (Value::use_iterator U = Scalar->use_begin(), UE = Scalar->use_end();
- U != UE; ++U) {
- DEBUG(dbgs() << "SLP: \tUser " << **U << ". \n");
- Instruction *User = dyn_cast<Instruction>(*U);
- if (!User) {
- DEBUG(dbgs() << "SLP: Gathering due unknown user. \n");
- newTreeEntry(VL, false);
- return;
- }
-
- // We don't care if the user is in a different basic block.
- BasicBlock *UserBlock = User->getParent();
- if (UserBlock != BB) {
- DEBUG(dbgs() << "SLP: User from a different basic block "
- << *User << ". \n");
- continue;
- }
-
- // If this is a PHINode within this basic block then we can place the
- // extract wherever we want.
- if (isa<PHINode>(*User)) {
- DEBUG(dbgs() << "SLP: \tWe can schedule PHIs:" << *User << ". \n");
- continue;
- }
-
- // Check if this is a safe in-tree user.
- if (ScalarToTreeEntry.count(User)) {
- int Idx = ScalarToTreeEntry[User];
- int VecLocation = VectorizableTree[Idx].LastScalarIndex;
- if (VecLocation <= MyLastIndex) {
- DEBUG(dbgs() << "SLP: Gathering due to unschedulable vector. \n");
- newTreeEntry(VL, false);
- return;
- }
- DEBUG(dbgs() << "SLP: In-tree user (" << *User << ") at #" <<
- VecLocation << " vector value (" << *Scalar << ") at #"
- << MyLastIndex << ".\n");
- continue;
- }
-
- // This user is part of the reduction.
- if (RdxOps && RdxOps->count(User))
- continue;
-
- // Make sure that we can schedule this unknown user.
- BlockNumbering &BN = BlocksNumbers[BB];
- int UserIndex = BN.getIndex(User);
- if (UserIndex < MyLastIndex) {
-
- DEBUG(dbgs() << "SLP: Can't schedule extractelement for "
- << *User << ". \n");
- newTreeEntry(VL, false);
- return;
- }
- }
+ if (!DT->isReachableFromEntry(BB)) {
+ // Don't go into unreachable blocks. They may contain instructions with
+ // dependency cycles which confuse the final scheduling.
+ DEBUG(dbgs() << "SLP: bundle in unreachable block.\n");
+ newTreeEntry(VL, false);
+ return;
}
-
+
// Check that every instructions appears once in this bundle.
for (unsigned i = 0, e = VL.size(); i < e; ++i)
for (unsigned j = i+1; j < e; ++j)
return;
}
- // Check that instructions in this bundle don't reference other instructions.
- // The runtime of this check is O(N * N-1 * uses(N)) and a typical N is 4.
- for (unsigned i = 0, e = VL.size(); i < e; ++i) {
- for (Value::use_iterator U = VL[i]->use_begin(), UE = VL[i]->use_end();
- U != UE; ++U) {
- for (unsigned j = 0; j < e; ++j) {
- if (i != j && *U == VL[j]) {
- DEBUG(dbgs() << "SLP: Intra-bundle dependencies!" << **U << ". \n");
- newTreeEntry(VL, false);
- return;
- }
- }
- }
+ auto &BSRef = BlocksSchedules[BB];
+ if (!BSRef) {
+ BSRef = llvm::make_unique<BlockScheduling>(BB);
}
+ BlockScheduling &BS = *BSRef.get();
- DEBUG(dbgs() << "SLP: We are able to schedule this bundle.\n");
-
- unsigned Opcode = getSameOpcode(VL);
-
- // Check if it is safe to sink the loads or the stores.
- if (Opcode == Instruction::Load || Opcode == Instruction::Store) {
- Instruction *Last = getLastInstruction(VL);
-
- for (unsigned i = 0, e = VL.size(); i < e; ++i) {
- if (VL[i] == Last)
- continue;
- Value *Barrier = getSinkBarrier(cast<Instruction>(VL[i]), Last);
- if (Barrier) {
- DEBUG(dbgs() << "SLP: Can't sink " << *VL[i] << "\n down to " << *Last
- << "\n because of " << *Barrier << ". Gathering.\n");
- newTreeEntry(VL, false);
- return;
- }
- }
+ if (!BS.tryScheduleBundle(VL, this)) {
+ DEBUG(dbgs() << "SLP: We are not able to schedule this bundle!\n");
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ return;
}
+ DEBUG(dbgs() << "SLP: We are able to schedule this bundle.\n");
switch (Opcode) {
case Instruction::PHI: {
// Check for terminator values (e.g. invoke).
for (unsigned j = 0; j < VL.size(); ++j)
for (unsigned i = 0, e = PH->getNumIncomingValues(); i < e; ++i) {
- TerminatorInst *Term = dyn_cast<TerminatorInst>(cast<PHINode>(VL[j])->getIncomingValue(i));
+ TerminatorInst *Term = dyn_cast<TerminatorInst>(
+ cast<PHINode>(VL[j])->getIncomingValueForBlock(PH->getIncomingBlock(i)));
if (Term) {
DEBUG(dbgs() << "SLP: Need to swizzle PHINodes (TerminatorInst use).\n");
+ BS.cancelScheduling(VL);
newTreeEntry(VL, false);
return;
}
ValueList Operands;
// Prepare the operand vector.
for (unsigned j = 0; j < VL.size(); ++j)
- Operands.push_back(cast<PHINode>(VL[j])->getIncomingValue(i));
+ Operands.push_back(cast<PHINode>(VL[j])->getIncomingValueForBlock(
+ PH->getIncomingBlock(i)));
buildTree_rec(Operands, Depth + 1);
}
bool Reuse = CanReuseExtract(VL);
if (Reuse) {
DEBUG(dbgs() << "SLP: Reusing extract sequence.\n");
+ } else {
+ BS.cancelScheduling(VL);
}
newTreeEntry(VL, Reuse);
return;
// Check if the loads are consecutive or of we need to swizzle them.
for (unsigned i = 0, e = VL.size() - 1; i < e; ++i) {
LoadInst *L = cast<LoadInst>(VL[i]);
- if (!L->isSimple() || !isConsecutiveAccess(VL[i], VL[i + 1])) {
+ if (!L->isSimple()) {
+ BS.cancelScheduling(VL);
newTreeEntry(VL, false);
- DEBUG(dbgs() << "SLP: Need to swizzle loads.\n");
+ DEBUG(dbgs() << "SLP: Gathering non-simple loads.\n");
+ return;
+ }
+ if (!isConsecutiveAccess(VL[i], VL[i + 1])) {
+ if (VL.size() == 2 && isConsecutiveAccess(VL[1], VL[0])) {
+ ++NumLoadsWantToChangeOrder;
+ }
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ DEBUG(dbgs() << "SLP: Gathering non-consecutive loads.\n");
return;
}
}
+ ++NumLoadsWantToKeepOrder;
newTreeEntry(VL, true);
DEBUG(dbgs() << "SLP: added a vector of loads.\n");
return;
for (unsigned i = 0; i < VL.size(); ++i) {
Type *Ty = cast<Instruction>(VL[i])->getOperand(0)->getType();
if (Ty != SrcTy || Ty->isAggregateType() || Ty->isVectorTy()) {
+ BS.cancelScheduling(VL);
newTreeEntry(VL, false);
DEBUG(dbgs() << "SLP: Gathering casts with different src types.\n");
return;
CmpInst *Cmp = cast<CmpInst>(VL[i]);
if (Cmp->getPredicate() != P0 ||
Cmp->getOperand(0)->getType() != ComparedTy) {
+ BS.cancelScheduling(VL);
newTreeEntry(VL, false);
DEBUG(dbgs() << "SLP: Gathering cmp with different predicate.\n");
return;
}
return;
}
+ case Instruction::GetElementPtr: {
+ // We don't combine GEPs with complicated (nested) indexing.
+ for (unsigned j = 0; j < VL.size(); ++j) {
+ if (cast<Instruction>(VL[j])->getNumOperands() != 2) {
+ DEBUG(dbgs() << "SLP: not-vectorizable GEP (nested indexes).\n");
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ return;
+ }
+ }
+
+ // We can't combine several GEPs into one vector if they operate on
+ // different types.
+ Type *Ty0 = cast<Instruction>(VL0)->getOperand(0)->getType();
+ for (unsigned j = 0; j < VL.size(); ++j) {
+ Type *CurTy = cast<Instruction>(VL[j])->getOperand(0)->getType();
+ if (Ty0 != CurTy) {
+ DEBUG(dbgs() << "SLP: not-vectorizable GEP (different types).\n");
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ return;
+ }
+ }
+
+ // We don't combine GEPs with non-constant indexes.
+ for (unsigned j = 0; j < VL.size(); ++j) {
+ auto Op = cast<Instruction>(VL[j])->getOperand(1);
+ if (!isa<ConstantInt>(Op)) {
+ DEBUG(
+ dbgs() << "SLP: not-vectorizable GEP (non-constant indexes).\n");
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ return;
+ }
+ }
+
+ newTreeEntry(VL, true);
+ DEBUG(dbgs() << "SLP: added a vector of GEPs.\n");
+ for (unsigned i = 0, e = 2; i < e; ++i) {
+ ValueList Operands;
+ // Prepare the operand vector.
+ for (unsigned j = 0; j < VL.size(); ++j)
+ Operands.push_back(cast<Instruction>(VL[j])->getOperand(i));
+
+ buildTree_rec(Operands, Depth + 1);
+ }
+ return;
+ }
case Instruction::Store: {
// Check if the stores are consecutive or of we need to swizzle them.
for (unsigned i = 0, e = VL.size() - 1; i < e; ++i)
if (!isConsecutiveAccess(VL[i], VL[i + 1])) {
+ BS.cancelScheduling(VL);
newTreeEntry(VL, false);
- DEBUG(dbgs() << "SLP: Non consecutive store.\n");
+ DEBUG(dbgs() << "SLP: Non-consecutive store.\n");
return;
}
for (unsigned j = 0; j < VL.size(); ++j)
Operands.push_back(cast<Instruction>(VL[j])->getOperand(0));
- // We can ignore these values because we are sinking them down.
- MemBarrierIgnoreList.insert(VL.begin(), VL.end());
- buildTree_rec(Operands, Depth + 1);
+ buildTree_rec(Operands, Depth + 1);
+ return;
+ }
+ case Instruction::Call: {
+ // Check if the calls are all to the same vectorizable intrinsic.
+ CallInst *CI = cast<CallInst>(VL[0]);
+ // Check if this is an Intrinsic call or something that can be
+ // represented by an intrinsic call
+ Intrinsic::ID ID = getIntrinsicIDForCall(CI, TLI);
+ if (!isTriviallyVectorizable(ID)) {
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ DEBUG(dbgs() << "SLP: Non-vectorizable call.\n");
+ return;
+ }
+ Function *Int = CI->getCalledFunction();
+ Value *A1I = nullptr;
+ if (hasVectorInstrinsicScalarOpd(ID, 1))
+ A1I = CI->getArgOperand(1);
+ for (unsigned i = 1, e = VL.size(); i != e; ++i) {
+ CallInst *CI2 = dyn_cast<CallInst>(VL[i]);
+ if (!CI2 || CI2->getCalledFunction() != Int ||
+ getIntrinsicIDForCall(CI2, TLI) != ID) {
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ DEBUG(dbgs() << "SLP: mismatched calls:" << *CI << "!=" << *VL[i]
+ << "\n");
+ return;
+ }
+ // ctlz,cttz and powi are special intrinsics whose second argument
+ // should be same in order for them to be vectorized.
+ if (hasVectorInstrinsicScalarOpd(ID, 1)) {
+ Value *A1J = CI2->getArgOperand(1);
+ if (A1I != A1J) {
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ DEBUG(dbgs() << "SLP: mismatched arguments in call:" << *CI
+ << " argument "<< A1I<<"!=" << A1J
+ << "\n");
+ return;
+ }
+ }
+ }
+
+ newTreeEntry(VL, true);
+ for (unsigned i = 0, e = CI->getNumArgOperands(); i != e; ++i) {
+ ValueList Operands;
+ // Prepare the operand vector.
+ for (unsigned j = 0; j < VL.size(); ++j) {
+ CallInst *CI2 = dyn_cast<CallInst>(VL[j]);
+ Operands.push_back(CI2->getArgOperand(i));
+ }
+ buildTree_rec(Operands, Depth + 1);
+ }
+ return;
+ }
+ case Instruction::ShuffleVector: {
+ // If this is not an alternate sequence of opcode like add-sub
+ // then do not vectorize this instruction.
+ if (!isAltShuffle) {
+ BS.cancelScheduling(VL);
+ newTreeEntry(VL, false);
+ DEBUG(dbgs() << "SLP: ShuffleVector are not vectorized.\n");
+ return;
+ }
+ newTreeEntry(VL, true);
+ DEBUG(dbgs() << "SLP: added a ShuffleVector op.\n");
+ for (unsigned i = 0, e = VL0->getNumOperands(); i < e; ++i) {
+ ValueList Operands;
+ // Prepare the operand vector.
+ for (unsigned j = 0; j < VL.size(); ++j)
+ Operands.push_back(cast<Instruction>(VL[j])->getOperand(i));
+
+ buildTree_rec(Operands, Depth + 1);
+ }
return;
}
default:
+ BS.cancelScheduling(VL);
newTreeEntry(VL, false);
DEBUG(dbgs() << "SLP: Gathering unknown instruction.\n");
return;
}
return getGatherCost(E->Scalars);
}
-
- assert(getSameOpcode(VL) && getSameType(VL) && getSameBlock(VL) &&
- "Invalid VL");
+ unsigned Opcode = getSameOpcode(VL);
+ assert(Opcode && getSameType(VL) && getSameBlock(VL) && "Invalid VL");
Instruction *VL0 = cast<Instruction>(VL[0]);
- unsigned Opcode = VL0->getOpcode();
switch (Opcode) {
case Instruction::PHI: {
return 0;
}
case Instruction::ExtractElement: {
- if (CanReuseExtract(VL))
- return 0;
+ if (CanReuseExtract(VL)) {
+ int DeadCost = 0;
+ for (unsigned i = 0, e = VL.size(); i < e; ++i) {
+ ExtractElementInst *E = cast<ExtractElementInst>(VL[i]);
+ if (E->hasOneUse())
+ // Take credit for instruction that will become dead.
+ DeadCost +=
+ TTI->getVectorInstrCost(Instruction::ExtractElement, VecTy, i);
+ }
+ return -DeadCost;
+ }
return getGatherCost(VecTy);
}
case Instruction::ZExt:
TargetTransformInfo::OK_AnyValue;
TargetTransformInfo::OperandValueKind Op2VK =
TargetTransformInfo::OK_UniformConstantValue;
-
- // Check whether all second operands are constant.
- for (unsigned i = 0; i < VL.size(); ++i)
- if (!isa<ConstantInt>(cast<Instruction>(VL[i])->getOperand(1))) {
+ TargetTransformInfo::OperandValueProperties Op1VP =
+ TargetTransformInfo::OP_None;
+ TargetTransformInfo::OperandValueProperties Op2VP =
+ TargetTransformInfo::OP_None;
+
+ // If all operands are exactly the same ConstantInt then set the
+ // operand kind to OK_UniformConstantValue.
+ // If instead not all operands are constants, then set the operand kind
+ // to OK_AnyValue. If all operands are constants but not the same,
+ // then set the operand kind to OK_NonUniformConstantValue.
+ ConstantInt *CInt = nullptr;
+ for (unsigned i = 0; i < VL.size(); ++i) {
+ const Instruction *I = cast<Instruction>(VL[i]);
+ if (!isa<ConstantInt>(I->getOperand(1))) {
Op2VK = TargetTransformInfo::OK_AnyValue;
break;
}
+ if (i == 0) {
+ CInt = cast<ConstantInt>(I->getOperand(1));
+ continue;
+ }
+ if (Op2VK == TargetTransformInfo::OK_UniformConstantValue &&
+ CInt != cast<ConstantInt>(I->getOperand(1)))
+ Op2VK = TargetTransformInfo::OK_NonUniformConstantValue;
+ }
+ // FIXME: Currently cost of model modification for division by
+ // power of 2 is handled only for X86. Add support for other targets.
+ if (Op2VK == TargetTransformInfo::OK_UniformConstantValue && CInt &&
+ CInt->getValue().isPowerOf2())
+ Op2VP = TargetTransformInfo::OP_PowerOf2;
- ScalarCost =
- VecTy->getNumElements() *
- TTI->getArithmeticInstrCost(Opcode, ScalarTy, Op1VK, Op2VK);
- VecCost = TTI->getArithmeticInstrCost(Opcode, VecTy, Op1VK, Op2VK);
+ ScalarCost = VecTy->getNumElements() *
+ TTI->getArithmeticInstrCost(Opcode, ScalarTy, Op1VK, Op2VK,
+ Op1VP, Op2VP);
+ VecCost = TTI->getArithmeticInstrCost(Opcode, VecTy, Op1VK, Op2VK,
+ Op1VP, Op2VP);
}
return VecCost - ScalarCost;
}
+ case Instruction::GetElementPtr: {
+ TargetTransformInfo::OperandValueKind Op1VK =
+ TargetTransformInfo::OK_AnyValue;
+ TargetTransformInfo::OperandValueKind Op2VK =
+ TargetTransformInfo::OK_UniformConstantValue;
+
+ int ScalarCost =
+ VecTy->getNumElements() *
+ TTI->getArithmeticInstrCost(Instruction::Add, ScalarTy, Op1VK, Op2VK);
+ int VecCost =
+ TTI->getArithmeticInstrCost(Instruction::Add, VecTy, Op1VK, Op2VK);
+
+ return VecCost - ScalarCost;
+ }
case Instruction::Load: {
// Cost of wide load - cost of scalar loads.
int ScalarLdCost = VecTy->getNumElements() *
int VecStCost = TTI->getMemoryOpCost(Instruction::Store, VecTy, 1, 0);
return VecStCost - ScalarStCost;
}
+ case Instruction::Call: {
+ CallInst *CI = cast<CallInst>(VL0);
+ Intrinsic::ID ID = getIntrinsicIDForCall(CI, TLI);
+
+ // Calculate the cost of the scalar and vector calls.
+ SmallVector<Type*, 4> ScalarTys, VecTys;
+ for (unsigned op = 0, opc = CI->getNumArgOperands(); op!= opc; ++op) {
+ ScalarTys.push_back(CI->getArgOperand(op)->getType());
+ VecTys.push_back(VectorType::get(CI->getArgOperand(op)->getType(),
+ VecTy->getNumElements()));
+ }
+
+ int ScalarCallCost = VecTy->getNumElements() *
+ TTI->getIntrinsicInstrCost(ID, ScalarTy, ScalarTys);
+
+ int VecCallCost = TTI->getIntrinsicInstrCost(ID, VecTy, VecTys);
+
+ DEBUG(dbgs() << "SLP: Call cost "<< VecCallCost - ScalarCallCost
+ << " (" << VecCallCost << "-" << ScalarCallCost << ")"
+ << " for " << *CI << "\n");
+
+ return VecCallCost - ScalarCallCost;
+ }
+ case Instruction::ShuffleVector: {
+ TargetTransformInfo::OperandValueKind Op1VK =
+ TargetTransformInfo::OK_AnyValue;
+ TargetTransformInfo::OperandValueKind Op2VK =
+ TargetTransformInfo::OK_AnyValue;
+ int ScalarCost = 0;
+ int VecCost = 0;
+ for (unsigned i = 0; i < VL.size(); ++i) {
+ Instruction *I = cast<Instruction>(VL[i]);
+ if (!I)
+ break;
+ ScalarCost +=
+ TTI->getArithmeticInstrCost(I->getOpcode(), ScalarTy, Op1VK, Op2VK);
+ }
+ // VecCost is equal to sum of the cost of creating 2 vectors
+ // and the cost of creating shuffle.
+ Instruction *I0 = cast<Instruction>(VL[0]);
+ VecCost =
+ TTI->getArithmeticInstrCost(I0->getOpcode(), VecTy, Op1VK, Op2VK);
+ Instruction *I1 = cast<Instruction>(VL[1]);
+ VecCost +=
+ TTI->getArithmeticInstrCost(I1->getOpcode(), VecTy, Op1VK, Op2VK);
+ VecCost +=
+ TTI->getShuffleCost(TargetTransformInfo::SK_Alternate, VecTy, 0);
+ return VecCost - ScalarCost;
+ }
default:
llvm_unreachable("Unknown instruction");
}
if (VectorizableTree.size() != 2)
return false;
+ // Handle splat stores.
+ if (!VectorizableTree[0].NeedToGather && isSplat(VectorizableTree[1].Scalars))
+ return true;
+
// Gathering cost would be too much for tiny trees.
- if (VectorizableTree[0].NeedToGather || VectorizableTree[1].NeedToGather)
- return false;
+ if (VectorizableTree[0].NeedToGather || VectorizableTree[1].NeedToGather)
+ return false;
+
+ return true;
+}
+
+int BoUpSLP::getSpillCost() {
+ // Walk from the bottom of the tree to the top, tracking which values are
+ // live. When we see a call instruction that is not part of our tree,
+ // query TTI to see if there is a cost to keeping values live over it
+ // (for example, if spills and fills are required).
+ unsigned BundleWidth = VectorizableTree.front().Scalars.size();
+ int Cost = 0;
+
+ SmallPtrSet<Instruction*, 4> LiveValues;
+ Instruction *PrevInst = nullptr;
+
+ for (unsigned N = 0; N < VectorizableTree.size(); ++N) {
+ Instruction *Inst = dyn_cast<Instruction>(VectorizableTree[N].Scalars[0]);
+ if (!Inst)
+ continue;
+
+ if (!PrevInst) {
+ PrevInst = Inst;
+ continue;
+ }
+
+ DEBUG(
+ dbgs() << "SLP: #LV: " << LiveValues.size();
+ for (auto *X : LiveValues)
+ dbgs() << " " << X->getName();
+ dbgs() << ", Looking at ";
+ Inst->dump();
+ );
+
+ // Update LiveValues.
+ LiveValues.erase(PrevInst);
+ for (auto &J : PrevInst->operands()) {
+ if (isa<Instruction>(&*J) && ScalarToTreeEntry.count(&*J))
+ LiveValues.insert(cast<Instruction>(&*J));
+ }
+
+ // Now find the sequence of instructions between PrevInst and Inst.
+ BasicBlock::reverse_iterator InstIt(Inst), PrevInstIt(PrevInst);
+ --PrevInstIt;
+ while (InstIt != PrevInstIt) {
+ if (PrevInstIt == PrevInst->getParent()->rend()) {
+ PrevInstIt = Inst->getParent()->rbegin();
+ continue;
+ }
+
+ if (isa<CallInst>(&*PrevInstIt) && &*PrevInstIt != PrevInst) {
+ SmallVector<Type*, 4> V;
+ for (auto *II : LiveValues)
+ V.push_back(VectorType::get(II->getType(), BundleWidth));
+ Cost += TTI->getCostOfKeepingLiveOverCall(V);
+ }
+
+ ++PrevInstIt;
+ }
+
+ PrevInst = Inst;
+ }
- return true;
+ DEBUG(dbgs() << "SLP: SpillCost=" << Cost << "\n");
+ return Cost;
}
int BoUpSLP::getTreeCost() {
for (UserList::iterator I = ExternalUses.begin(), E = ExternalUses.end();
I != E; ++I) {
// We only add extract cost once for the same scalar.
- if (!ExtractCostCalculated.insert(I->Scalar))
+ if (!ExtractCostCalculated.insert(I->Scalar).second)
+ continue;
+
+ // Uses by ephemeral values are free (because the ephemeral value will be
+ // removed prior to code generation, and so the extraction will be
+ // removed as well).
+ if (EphValues.count(I->User))
continue;
VectorType *VecTy = VectorType::get(I->Scalar->getType(), BundleWidth);
I->Lane);
}
+ Cost += getSpillCost();
+
DEBUG(dbgs() << "SLP: Total Cost " << Cost + ExtractCost<< ".\n");
return Cost + ExtractCost;
}
return getGatherCost(VecTy);
}
-AliasAnalysis::Location BoUpSLP::getLocation(Instruction *I) {
- if (StoreInst *SI = dyn_cast<StoreInst>(I))
- return AA->getLocation(SI);
- if (LoadInst *LI = dyn_cast<LoadInst>(I))
- return AA->getLocation(LI);
- return AliasAnalysis::Location();
-}
-
Value *BoUpSLP::getPointerOperand(Value *I) {
if (LoadInst *LI = dyn_cast<LoadInst>(I))
return LI->getPointerOperand();
if (StoreInst *SI = dyn_cast<StoreInst>(I))
return SI->getPointerOperand();
- return 0;
+ return nullptr;
}
unsigned BoUpSLP::getAddressSpaceOperand(Value *I) {
return X == PtrSCEVB;
}
-Value *BoUpSLP::getSinkBarrier(Instruction *Src, Instruction *Dst) {
- assert(Src->getParent() == Dst->getParent() && "Not the same BB");
- BasicBlock::iterator I = Src, E = Dst;
- /// Scan all of the instruction from SRC to DST and check if
- /// the source may alias.
- for (++I; I != E; ++I) {
- // Ignore store instructions that are marked as 'ignore'.
- if (MemBarrierIgnoreList.count(I))
- continue;
- if (Src->mayWriteToMemory()) /* Write */ {
- if (!I->mayReadOrWriteMemory())
- continue;
- } else /* Read */ {
- if (!I->mayWriteToMemory())
- continue;
- }
- AliasAnalysis::Location A = getLocation(&*I);
- AliasAnalysis::Location B = getLocation(Src);
-
- if (!A.Ptr || !B.Ptr || AA->alias(A, B))
- return I;
- }
- return 0;
-}
-
-int BoUpSLP::getLastIndex(ArrayRef<Value *> VL) {
- BasicBlock *BB = cast<Instruction>(VL[0])->getParent();
- assert(BB == getSameBlock(VL) && BlocksNumbers.count(BB) && "Invalid block");
- BlockNumbering &BN = BlocksNumbers[BB];
-
- int MaxIdx = BN.getIndex(BB->getFirstNonPHI());
- for (unsigned i = 0, e = VL.size(); i < e; ++i)
- MaxIdx = std::max(MaxIdx, BN.getIndex(cast<Instruction>(VL[i])));
- return MaxIdx;
-}
-
-Instruction *BoUpSLP::getLastInstruction(ArrayRef<Value *> VL) {
- BasicBlock *BB = cast<Instruction>(VL[0])->getParent();
- assert(BB == getSameBlock(VL) && BlocksNumbers.count(BB) && "Invalid block");
- BlockNumbering &BN = BlocksNumbers[BB];
-
- int MaxIdx = BN.getIndex(cast<Instruction>(VL[0]));
- for (unsigned i = 1, e = VL.size(); i < e; ++i)
- MaxIdx = std::max(MaxIdx, BN.getIndex(cast<Instruction>(VL[i])));
- Instruction *I = BN.getInstruction(MaxIdx);
- assert(I && "bad location");
- return I;
-}
-
void BoUpSLP::setInsertPointAfterBundle(ArrayRef<Value *> VL) {
Instruction *VL0 = cast<Instruction>(VL[0]);
- Instruction *LastInst = getLastInstruction(VL);
- BasicBlock::iterator NextInst = LastInst;
+ BasicBlock::iterator NextInst = VL0;
++NextInst;
Builder.SetInsertPoint(VL0->getParent(), NextInst);
Builder.SetCurrentDebugLocation(VL0->getDebugLoc());
Vec = Builder.CreateInsertElement(Vec, VL[i], Builder.getInt32(i));
if (Instruction *Insrt = dyn_cast<Instruction>(Vec)) {
GatherSeq.insert(Insrt);
+ CSEBlocks.insert(Insrt->getParent());
// Add to our 'need-to-extract' list.
if (ScalarToTreeEntry.count(VL[i])) {
if (En->isSame(VL) && En->VectorizedValue)
return En->VectorizedValue;
}
- return 0;
+ return nullptr;
}
Value *BoUpSLP::vectorizeTree(ArrayRef<Value *> VL) {
return Gather(E->Scalars, VecTy);
}
- unsigned Opcode = VL0->getOpcode();
- assert(Opcode == getSameOpcode(E->Scalars) && "Invalid opcode");
+ unsigned Opcode = getSameOpcode(E->Scalars);
switch (Opcode) {
case Instruction::PHI: {
ValueList Operands;
BasicBlock *IBB = PH->getIncomingBlock(i);
- if (!VisitedBBs.insert(IBB)) {
+ if (!VisitedBBs.insert(IBB).second) {
NewPhi->addIncoming(NewPhi->getIncomingValueForBlock(IBB), IBB);
continue;
}
CastInst *CI = dyn_cast<CastInst>(VL0);
Value *V = Builder.CreateCast(CI->getOpcode(), InVec, VecTy);
E->VectorizedValue = V;
+ ++NumVectorInstructions;
return V;
}
case Instruction::FCmp:
V = Builder.CreateICmp(P0, L, R);
E->VectorizedValue = V;
+ ++NumVectorInstructions;
return V;
}
case Instruction::Select: {
Value *V = Builder.CreateSelect(Cond, True, False);
E->VectorizedValue = V;
+ ++NumVectorInstructions;
return V;
}
case Instruction::Add:
BinaryOperator *BinOp = cast<BinaryOperator>(VL0);
Value *V = Builder.CreateBinOp(BinOp->getOpcode(), LHS, RHS);
E->VectorizedValue = V;
+ propagateIRFlags(E->VectorizedValue, E->Scalars);
+ ++NumVectorInstructions;
if (Instruction *I = dyn_cast<Instruction>(V))
return propagateMetadata(I, E->Scalars);
setInsertPointAfterBundle(E->Scalars);
LoadInst *LI = cast<LoadInst>(VL0);
+ Type *ScalarLoadTy = LI->getType();
unsigned AS = LI->getPointerAddressSpace();
Value *VecPtr = Builder.CreateBitCast(LI->getPointerOperand(),
VecTy->getPointerTo(AS));
+
+ // The pointer operand uses an in-tree scalar so we add the new BitCast to
+ // ExternalUses list to make sure that an extract will be generated in the
+ // future.
+ if (ScalarToTreeEntry.count(LI->getPointerOperand()))
+ ExternalUses.push_back(
+ ExternalUser(LI->getPointerOperand(), cast<User>(VecPtr), 0));
+
unsigned Alignment = LI->getAlignment();
LI = Builder.CreateLoad(VecPtr);
+ if (!Alignment)
+ Alignment = DL->getABITypeAlignment(ScalarLoadTy);
LI->setAlignment(Alignment);
E->VectorizedValue = LI;
+ ++NumVectorInstructions;
return propagateMetadata(LI, E->Scalars);
}
case Instruction::Store: {
Value *VecPtr = Builder.CreateBitCast(SI->getPointerOperand(),
VecTy->getPointerTo(AS));
StoreInst *S = Builder.CreateStore(VecValue, VecPtr);
+
+ // The pointer operand uses an in-tree scalar so we add the new BitCast to
+ // ExternalUses list to make sure that an extract will be generated in the
+ // future.
+ if (ScalarToTreeEntry.count(SI->getPointerOperand()))
+ ExternalUses.push_back(
+ ExternalUser(SI->getPointerOperand(), cast<User>(VecPtr), 0));
+
+ if (!Alignment)
+ Alignment = DL->getABITypeAlignment(SI->getValueOperand()->getType());
S->setAlignment(Alignment);
E->VectorizedValue = S;
+ ++NumVectorInstructions;
return propagateMetadata(S, E->Scalars);
}
+ case Instruction::GetElementPtr: {
+ setInsertPointAfterBundle(E->Scalars);
+
+ ValueList Op0VL;
+ for (int i = 0, e = E->Scalars.size(); i < e; ++i)
+ Op0VL.push_back(cast<GetElementPtrInst>(E->Scalars[i])->getOperand(0));
+
+ Value *Op0 = vectorizeTree(Op0VL);
+
+ std::vector<Value *> OpVecs;
+ for (int j = 1, e = cast<GetElementPtrInst>(VL0)->getNumOperands(); j < e;
+ ++j) {
+ ValueList OpVL;
+ for (int i = 0, e = E->Scalars.size(); i < e; ++i)
+ OpVL.push_back(cast<GetElementPtrInst>(E->Scalars[i])->getOperand(j));
+
+ Value *OpVec = vectorizeTree(OpVL);
+ OpVecs.push_back(OpVec);
+ }
+
+ Value *V = Builder.CreateGEP(Op0, OpVecs);
+ E->VectorizedValue = V;
+ ++NumVectorInstructions;
+
+ if (Instruction *I = dyn_cast<Instruction>(V))
+ return propagateMetadata(I, E->Scalars);
+
+ return V;
+ }
+ case Instruction::Call: {
+ CallInst *CI = cast<CallInst>(VL0);
+ setInsertPointAfterBundle(E->Scalars);
+ Function *FI;
+ Intrinsic::ID IID = Intrinsic::not_intrinsic;
+ Value *ScalarArg = nullptr;
+ if (CI && (FI = CI->getCalledFunction())) {
+ IID = (Intrinsic::ID) FI->getIntrinsicID();
+ }
+ std::vector<Value *> OpVecs;
+ for (int j = 0, e = CI->getNumArgOperands(); j < e; ++j) {
+ ValueList OpVL;
+ // ctlz,cttz and powi are special intrinsics whose second argument is
+ // a scalar. This argument should not be vectorized.
+ if (hasVectorInstrinsicScalarOpd(IID, 1) && j == 1) {
+ CallInst *CEI = cast<CallInst>(E->Scalars[0]);
+ ScalarArg = CEI->getArgOperand(j);
+ OpVecs.push_back(CEI->getArgOperand(j));
+ continue;
+ }
+ for (int i = 0, e = E->Scalars.size(); i < e; ++i) {
+ CallInst *CEI = cast<CallInst>(E->Scalars[i]);
+ OpVL.push_back(CEI->getArgOperand(j));
+ }
+
+ Value *OpVec = vectorizeTree(OpVL);
+ DEBUG(dbgs() << "SLP: OpVec[" << j << "]: " << *OpVec << "\n");
+ OpVecs.push_back(OpVec);
+ }
+
+ Module *M = F->getParent();
+ Intrinsic::ID ID = getIntrinsicIDForCall(CI, TLI);
+ Type *Tys[] = { VectorType::get(CI->getType(), E->Scalars.size()) };
+ Function *CF = Intrinsic::getDeclaration(M, ID, Tys);
+ Value *V = Builder.CreateCall(CF, OpVecs);
+
+ // The scalar argument uses an in-tree scalar so we add the new vectorized
+ // call to ExternalUses list to make sure that an extract will be
+ // generated in the future.
+ if (ScalarArg && ScalarToTreeEntry.count(ScalarArg))
+ ExternalUses.push_back(ExternalUser(ScalarArg, cast<User>(V), 0));
+
+ E->VectorizedValue = V;
+ ++NumVectorInstructions;
+ return V;
+ }
+ case Instruction::ShuffleVector: {
+ ValueList LHSVL, RHSVL;
+ for (int i = 0, e = E->Scalars.size(); i < e; ++i) {
+ LHSVL.push_back(cast<Instruction>(E->Scalars[i])->getOperand(0));
+ RHSVL.push_back(cast<Instruction>(E->Scalars[i])->getOperand(1));
+ }
+ setInsertPointAfterBundle(E->Scalars);
+
+ Value *LHS = vectorizeTree(LHSVL);
+ Value *RHS = vectorizeTree(RHSVL);
+
+ if (Value *V = alreadyVectorized(E->Scalars))
+ return V;
+
+ // Create a vector of LHS op1 RHS
+ BinaryOperator *BinOp0 = cast<BinaryOperator>(VL0);
+ Value *V0 = Builder.CreateBinOp(BinOp0->getOpcode(), LHS, RHS);
+
+ // Create a vector of LHS op2 RHS
+ Instruction *VL1 = cast<Instruction>(E->Scalars[1]);
+ BinaryOperator *BinOp1 = cast<BinaryOperator>(VL1);
+ Value *V1 = Builder.CreateBinOp(BinOp1->getOpcode(), LHS, RHS);
+
+ // Create shuffle to take alternate operations from the vector.
+ // Also, gather up odd and even scalar ops to propagate IR flags to
+ // each vector operation.
+ ValueList OddScalars, EvenScalars;
+ unsigned e = E->Scalars.size();
+ SmallVector<Constant *, 8> Mask(e);
+ for (unsigned i = 0; i < e; ++i) {
+ if (i & 1) {
+ Mask[i] = Builder.getInt32(e + i);
+ OddScalars.push_back(E->Scalars[i]);
+ } else {
+ Mask[i] = Builder.getInt32(i);
+ EvenScalars.push_back(E->Scalars[i]);
+ }
+ }
+
+ Value *ShuffleMask = ConstantVector::get(Mask);
+ propagateIRFlags(V0, EvenScalars);
+ propagateIRFlags(V1, OddScalars);
+
+ Value *V = Builder.CreateShuffleVector(V0, V1, ShuffleMask);
+ E->VectorizedValue = V;
+ ++NumVectorInstructions;
+ if (Instruction *I = dyn_cast<Instruction>(V))
+ return propagateMetadata(I, E->Scalars);
+
+ return V;
+ }
default:
llvm_unreachable("unknown inst");
}
- return 0;
+ return nullptr;
}
Value *BoUpSLP::vectorizeTree() {
+
+ // All blocks must be scheduled before any instructions are inserted.
+ for (auto &BSIter : BlocksSchedules) {
+ scheduleBlock(BSIter.second.get());
+ }
+
Builder.SetInsertPoint(F->getEntryBlock().begin());
vectorizeTree(&VectorizableTree[0]);
// Skip users that we already RAUW. This happens when one instruction
// has multiple uses of the same value.
- if (std::find(Scalar->use_begin(), Scalar->use_end(), User) ==
- Scalar->use_end())
+ if (std::find(Scalar->user_begin(), Scalar->user_end(), User) ==
+ Scalar->user_end())
continue;
assert(ScalarToTreeEntry.count(Scalar) && "Invalid scalar");
Value *Lane = Builder.getInt32(it->Lane);
// Generate extracts for out-of-tree users.
// Find the insertion point for the extractelement lane.
- if (PHINode *PN = dyn_cast<PHINode>(Vec)) {
- Builder.SetInsertPoint(PN->getParent()->getFirstInsertionPt());
- Value *Ex = Builder.CreateExtractElement(Vec, Lane);
- if (Instruction *Ins = dyn_cast<Instruction>(Ex))
- GatherSeq.insert(Ins);
- User->replaceUsesOfWith(Scalar, Ex);
- } else if (isa<Instruction>(Vec)){
+ if (isa<Instruction>(Vec)){
if (PHINode *PH = dyn_cast<PHINode>(User)) {
for (int i = 0, e = PH->getNumIncomingValues(); i != e; ++i) {
if (PH->getIncomingValue(i) == Scalar) {
Builder.SetInsertPoint(PH->getIncomingBlock(i)->getTerminator());
Value *Ex = Builder.CreateExtractElement(Vec, Lane);
- if (Instruction *Ins = dyn_cast<Instruction>(Ex))
- GatherSeq.insert(Ins);
+ CSEBlocks.insert(PH->getIncomingBlock(i));
PH->setOperand(i, Ex);
}
}
} else {
Builder.SetInsertPoint(cast<Instruction>(User));
Value *Ex = Builder.CreateExtractElement(Vec, Lane);
- if (Instruction *Ins = dyn_cast<Instruction>(Ex))
- GatherSeq.insert(Ins);
+ CSEBlocks.insert(cast<Instruction>(User)->getParent());
User->replaceUsesOfWith(Scalar, Ex);
}
} else {
Builder.SetInsertPoint(F->getEntryBlock().begin());
Value *Ex = Builder.CreateExtractElement(Vec, Lane);
- if (Instruction *Ins = dyn_cast<Instruction>(Ex))
- GatherSeq.insert(Ins);
+ CSEBlocks.insert(&F->getEntryBlock());
User->replaceUsesOfWith(Scalar, Ex);
}
// For each lane:
for (int Lane = 0, LE = Entry->Scalars.size(); Lane != LE; ++Lane) {
Value *Scalar = Entry->Scalars[Lane];
-
// No need to handle users of gathered values.
if (Entry->NeedToGather)
continue;
Type *Ty = Scalar->getType();
if (!Ty->isVoidTy()) {
- for (Value::use_iterator User = Scalar->use_begin(),
- UE = Scalar->use_end(); User != UE; ++User) {
- DEBUG(dbgs() << "SLP: \tvalidating user:" << **User << ".\n");
- assert(!MustGather.count(*User) &&
- "Replacing gathered value with undef");
-
- assert((ScalarToTreeEntry.count(*User) ||
- // It is legal to replace the reduction users by undef.
- (RdxOps && RdxOps->count(*User))) &&
+#ifndef NDEBUG
+ for (User *U : Scalar->users()) {
+ DEBUG(dbgs() << "SLP: \tvalidating user:" << *U << ".\n");
+
+ assert((ScalarToTreeEntry.count(U) ||
+ // It is legal to replace users in the ignorelist by undef.
+ (std::find(UserIgnoreList.begin(), UserIgnoreList.end(), U) !=
+ UserIgnoreList.end())) &&
"Replacing out-of-tree value with undef");
}
+#endif
Value *Undef = UndefValue::get(Ty);
Scalar->replaceAllUsesWith(Undef);
}
}
}
- for (Function::iterator it = F->begin(), e = F->end(); it != e; ++it) {
- BlocksNumbers[it].forget();
- }
Builder.ClearInsertionPoint();
return VectorizableTree[0].VectorizedValue;
}
-class DTCmp {
- const DominatorTree *DT;
-
-public:
- DTCmp(const DominatorTree *DT) : DT(DT) {}
- bool operator()(const BasicBlock *A, const BasicBlock *B) const {
- return DT->properlyDominates(A, B);
- }
-};
-
void BoUpSLP::optimizeGatherSequence() {
DEBUG(dbgs() << "SLP: Optimizing " << GatherSeq.size()
<< " gather sequences instructions.\n");
- // Keep a list of visited BBs to run CSE on. It is typically small.
- SmallPtrSet<BasicBlock *, 4> VisitedBBs;
- SmallVector<BasicBlock *, 4> CSEWorkList;
// LICM InsertElementInst sequences.
for (SetVector<Instruction *>::iterator it = GatherSeq.begin(),
e = GatherSeq.end(); it != e; ++it) {
if (!Insert)
continue;
- if (VisitedBBs.insert(Insert->getParent()))
- CSEWorkList.push_back(Insert->getParent());
-
// Check if this block is inside a loop.
Loop *L = LI->getLoopFor(Insert->getParent());
if (!L)
Insert->moveBefore(PreHeader->getTerminator());
}
+ // Make a list of all reachable blocks in our CSE queue.
+ SmallVector<const DomTreeNode *, 8> CSEWorkList;
+ CSEWorkList.reserve(CSEBlocks.size());
+ for (BasicBlock *BB : CSEBlocks)
+ if (DomTreeNode *N = DT->getNode(BB)) {
+ assert(DT->isReachableFromEntry(N));
+ CSEWorkList.push_back(N);
+ }
+
// Sort blocks by domination. This ensures we visit a block after all blocks
// dominating it are visited.
- std::stable_sort(CSEWorkList.begin(), CSEWorkList.end(), DTCmp(DT));
+ std::stable_sort(CSEWorkList.begin(), CSEWorkList.end(),
+ [this](const DomTreeNode *A, const DomTreeNode *B) {
+ return DT->properlyDominates(A, B);
+ });
// Perform O(N^2) search over the gather sequences and merge identical
// instructions. TODO: We can further optimize this scan if we split the
// instructions into different buckets based on the insert lane.
SmallVector<Instruction *, 16> Visited;
- for (SmallVectorImpl<BasicBlock *>::iterator I = CSEWorkList.begin(),
- E = CSEWorkList.end();
- I != E; ++I) {
- assert((I == CSEWorkList.begin() || !DT->dominates(*I, *llvm::prior(I))) &&
+ for (auto I = CSEWorkList.begin(), E = CSEWorkList.end(); I != E; ++I) {
+ assert((I == CSEWorkList.begin() || !DT->dominates(*I, *std::prev(I))) &&
"Worklist not sorted properly!");
- BasicBlock *BB = *I;
+ BasicBlock *BB = (*I)->getBlock();
// For all instructions in blocks containing gather sequences:
for (BasicBlock::iterator it = BB->begin(), e = BB->end(); it != e;) {
Instruction *In = it++;
- if ((!isa<InsertElementInst>(In) && !isa<ExtractElementInst>(In)) ||
- !GatherSeq.count(In))
+ if (!isa<InsertElementInst>(In) && !isa<ExtractElementInst>(In))
continue;
// Check if we can replace this instruction with any of the
DT->dominates((*v)->getParent(), In->getParent())) {
In->replaceAllUsesWith(*v);
In->eraseFromParent();
- In = 0;
+ In = nullptr;
break;
}
}
}
}
}
+ CSEBlocks.clear();
+ GatherSeq.clear();
+}
+
+// Groups the instructions to a bundle (which is then a single scheduling entity)
+// and schedules instructions until the bundle gets ready.
+bool BoUpSLP::BlockScheduling::tryScheduleBundle(ArrayRef<Value *> VL,
+ BoUpSLP *SLP) {
+ if (isa<PHINode>(VL[0]))
+ return true;
+
+ // Initialize the instruction bundle.
+ Instruction *OldScheduleEnd = ScheduleEnd;
+ ScheduleData *PrevInBundle = nullptr;
+ ScheduleData *Bundle = nullptr;
+ bool ReSchedule = false;
+ DEBUG(dbgs() << "SLP: bundle: " << *VL[0] << "\n");
+ for (Value *V : VL) {
+ extendSchedulingRegion(V);
+ ScheduleData *BundleMember = getScheduleData(V);
+ assert(BundleMember &&
+ "no ScheduleData for bundle member (maybe not in same basic block)");
+ if (BundleMember->IsScheduled) {
+ // A bundle member was scheduled as single instruction before and now
+ // needs to be scheduled as part of the bundle. We just get rid of the
+ // existing schedule.
+ DEBUG(dbgs() << "SLP: reset schedule because " << *BundleMember
+ << " was already scheduled\n");
+ ReSchedule = true;
+ }
+ assert(BundleMember->isSchedulingEntity() &&
+ "bundle member already part of other bundle");
+ if (PrevInBundle) {
+ PrevInBundle->NextInBundle = BundleMember;
+ } else {
+ Bundle = BundleMember;
+ }
+ BundleMember->UnscheduledDepsInBundle = 0;
+ Bundle->UnscheduledDepsInBundle += BundleMember->UnscheduledDeps;
+
+ // Group the instructions to a bundle.
+ BundleMember->FirstInBundle = Bundle;
+ PrevInBundle = BundleMember;
+ }
+ if (ScheduleEnd != OldScheduleEnd) {
+ // The scheduling region got new instructions at the lower end (or it is a
+ // new region for the first bundle). This makes it necessary to
+ // recalculate all dependencies.
+ // It is seldom that this needs to be done a second time after adding the
+ // initial bundle to the region.
+ for (auto *I = ScheduleStart; I != ScheduleEnd; I = I->getNextNode()) {
+ ScheduleData *SD = getScheduleData(I);
+ SD->clearDependencies();
+ }
+ ReSchedule = true;
+ }
+ if (ReSchedule) {
+ resetSchedule();
+ initialFillReadyList(ReadyInsts);
+ }
+
+ DEBUG(dbgs() << "SLP: try schedule bundle " << *Bundle << " in block "
+ << BB->getName() << "\n");
+
+ calculateDependencies(Bundle, true, SLP);
+
+ // Now try to schedule the new bundle. As soon as the bundle is "ready" it
+ // means that there are no cyclic dependencies and we can schedule it.
+ // Note that's important that we don't "schedule" the bundle yet (see
+ // cancelScheduling).
+ while (!Bundle->isReady() && !ReadyInsts.empty()) {
+
+ ScheduleData *pickedSD = ReadyInsts.back();
+ ReadyInsts.pop_back();
+
+ if (pickedSD->isSchedulingEntity() && pickedSD->isReady()) {
+ schedule(pickedSD, ReadyInsts);
+ }
+ }
+ return Bundle->isReady();
+}
+
+void BoUpSLP::BlockScheduling::cancelScheduling(ArrayRef<Value *> VL) {
+ if (isa<PHINode>(VL[0]))
+ return;
+
+ ScheduleData *Bundle = getScheduleData(VL[0]);
+ DEBUG(dbgs() << "SLP: cancel scheduling of " << *Bundle << "\n");
+ assert(!Bundle->IsScheduled &&
+ "Can't cancel bundle which is already scheduled");
+ assert(Bundle->isSchedulingEntity() && Bundle->isPartOfBundle() &&
+ "tried to unbundle something which is not a bundle");
+
+ // Un-bundle: make single instructions out of the bundle.
+ ScheduleData *BundleMember = Bundle;
+ while (BundleMember) {
+ assert(BundleMember->FirstInBundle == Bundle && "corrupt bundle links");
+ BundleMember->FirstInBundle = BundleMember;
+ ScheduleData *Next = BundleMember->NextInBundle;
+ BundleMember->NextInBundle = nullptr;
+ BundleMember->UnscheduledDepsInBundle = BundleMember->UnscheduledDeps;
+ if (BundleMember->UnscheduledDepsInBundle == 0) {
+ ReadyInsts.insert(BundleMember);
+ }
+ BundleMember = Next;
+ }
+}
+
+void BoUpSLP::BlockScheduling::extendSchedulingRegion(Value *V) {
+ if (getScheduleData(V))
+ return;
+ Instruction *I = dyn_cast<Instruction>(V);
+ assert(I && "bundle member must be an instruction");
+ assert(!isa<PHINode>(I) && "phi nodes don't need to be scheduled");
+ if (!ScheduleStart) {
+ // It's the first instruction in the new region.
+ initScheduleData(I, I->getNextNode(), nullptr, nullptr);
+ ScheduleStart = I;
+ ScheduleEnd = I->getNextNode();
+ assert(ScheduleEnd && "tried to vectorize a TerminatorInst?");
+ DEBUG(dbgs() << "SLP: initialize schedule region to " << *I << "\n");
+ return;
+ }
+ // Search up and down at the same time, because we don't know if the new
+ // instruction is above or below the existing scheduling region.
+ BasicBlock::reverse_iterator UpIter(ScheduleStart);
+ BasicBlock::reverse_iterator UpperEnd = BB->rend();
+ BasicBlock::iterator DownIter(ScheduleEnd);
+ BasicBlock::iterator LowerEnd = BB->end();
+ for (;;) {
+ if (UpIter != UpperEnd) {
+ if (&*UpIter == I) {
+ initScheduleData(I, ScheduleStart, nullptr, FirstLoadStoreInRegion);
+ ScheduleStart = I;
+ DEBUG(dbgs() << "SLP: extend schedule region start to " << *I << "\n");
+ return;
+ }
+ UpIter++;
+ }
+ if (DownIter != LowerEnd) {
+ if (&*DownIter == I) {
+ initScheduleData(ScheduleEnd, I->getNextNode(), LastLoadStoreInRegion,
+ nullptr);
+ ScheduleEnd = I->getNextNode();
+ assert(ScheduleEnd && "tried to vectorize a TerminatorInst?");
+ DEBUG(dbgs() << "SLP: extend schedule region end to " << *I << "\n");
+ return;
+ }
+ DownIter++;
+ }
+ assert((UpIter != UpperEnd || DownIter != LowerEnd) &&
+ "instruction not found in block");
+ }
+}
+
+void BoUpSLP::BlockScheduling::initScheduleData(Instruction *FromI,
+ Instruction *ToI,
+ ScheduleData *PrevLoadStore,
+ ScheduleData *NextLoadStore) {
+ ScheduleData *CurrentLoadStore = PrevLoadStore;
+ for (Instruction *I = FromI; I != ToI; I = I->getNextNode()) {
+ ScheduleData *SD = ScheduleDataMap[I];
+ if (!SD) {
+ // Allocate a new ScheduleData for the instruction.
+ if (ChunkPos >= ChunkSize) {
+ ScheduleDataChunks.push_back(
+ llvm::make_unique<ScheduleData[]>(ChunkSize));
+ ChunkPos = 0;
+ }
+ SD = &(ScheduleDataChunks.back()[ChunkPos++]);
+ ScheduleDataMap[I] = SD;
+ SD->Inst = I;
+ }
+ assert(!isInSchedulingRegion(SD) &&
+ "new ScheduleData already in scheduling region");
+ SD->init(SchedulingRegionID);
+
+ if (I->mayReadOrWriteMemory()) {
+ // Update the linked list of memory accessing instructions.
+ if (CurrentLoadStore) {
+ CurrentLoadStore->NextLoadStore = SD;
+ } else {
+ FirstLoadStoreInRegion = SD;
+ }
+ CurrentLoadStore = SD;
+ }
+ }
+ if (NextLoadStore) {
+ if (CurrentLoadStore)
+ CurrentLoadStore->NextLoadStore = NextLoadStore;
+ } else {
+ LastLoadStoreInRegion = CurrentLoadStore;
+ }
+}
+
+void BoUpSLP::BlockScheduling::calculateDependencies(ScheduleData *SD,
+ bool InsertInReadyList,
+ BoUpSLP *SLP) {
+ assert(SD->isSchedulingEntity());
+
+ SmallVector<ScheduleData *, 10> WorkList;
+ WorkList.push_back(SD);
+
+ while (!WorkList.empty()) {
+ ScheduleData *SD = WorkList.back();
+ WorkList.pop_back();
+
+ ScheduleData *BundleMember = SD;
+ while (BundleMember) {
+ assert(isInSchedulingRegion(BundleMember));
+ if (!BundleMember->hasValidDependencies()) {
+
+ DEBUG(dbgs() << "SLP: update deps of " << *BundleMember << "\n");
+ BundleMember->Dependencies = 0;
+ BundleMember->resetUnscheduledDeps();
+
+ // Handle def-use chain dependencies.
+ for (User *U : BundleMember->Inst->users()) {
+ if (isa<Instruction>(U)) {
+ ScheduleData *UseSD = getScheduleData(U);
+ if (UseSD && isInSchedulingRegion(UseSD->FirstInBundle)) {
+ BundleMember->Dependencies++;
+ ScheduleData *DestBundle = UseSD->FirstInBundle;
+ if (!DestBundle->IsScheduled) {
+ BundleMember->incrementUnscheduledDeps(1);
+ }
+ if (!DestBundle->hasValidDependencies()) {
+ WorkList.push_back(DestBundle);
+ }
+ }
+ } else {
+ // I'm not sure if this can ever happen. But we need to be safe.
+ // This lets the instruction/bundle never be scheduled and eventally
+ // disable vectorization.
+ BundleMember->Dependencies++;
+ BundleMember->incrementUnscheduledDeps(1);
+ }
+ }
+
+ // Handle the memory dependencies.
+ ScheduleData *DepDest = BundleMember->NextLoadStore;
+ if (DepDest) {
+ Instruction *SrcInst = BundleMember->Inst;
+ AliasAnalysis::Location SrcLoc = getLocation(SrcInst, SLP->AA);
+ bool SrcMayWrite = BundleMember->Inst->mayWriteToMemory();
+
+ while (DepDest) {
+ assert(isInSchedulingRegion(DepDest));
+ if (SrcMayWrite || DepDest->Inst->mayWriteToMemory()) {
+ if (SLP->isAliased(SrcLoc, SrcInst, DepDest->Inst)) {
+ DepDest->MemoryDependencies.push_back(BundleMember);
+ BundleMember->Dependencies++;
+ ScheduleData *DestBundle = DepDest->FirstInBundle;
+ if (!DestBundle->IsScheduled) {
+ BundleMember->incrementUnscheduledDeps(1);
+ }
+ if (!DestBundle->hasValidDependencies()) {
+ WorkList.push_back(DestBundle);
+ }
+ }
+ }
+ DepDest = DepDest->NextLoadStore;
+ }
+ }
+ }
+ BundleMember = BundleMember->NextInBundle;
+ }
+ if (InsertInReadyList && SD->isReady()) {
+ ReadyInsts.push_back(SD);
+ DEBUG(dbgs() << "SLP: gets ready on update: " << *SD->Inst << "\n");
+ }
+ }
+}
+
+void BoUpSLP::BlockScheduling::resetSchedule() {
+ assert(ScheduleStart &&
+ "tried to reset schedule on block which has not been scheduled");
+ for (Instruction *I = ScheduleStart; I != ScheduleEnd; I = I->getNextNode()) {
+ ScheduleData *SD = getScheduleData(I);
+ assert(isInSchedulingRegion(SD));
+ SD->IsScheduled = false;
+ SD->resetUnscheduledDeps();
+ }
+ ReadyInsts.clear();
+}
+
+void BoUpSLP::scheduleBlock(BlockScheduling *BS) {
+
+ if (!BS->ScheduleStart)
+ return;
+
+ DEBUG(dbgs() << "SLP: schedule block " << BS->BB->getName() << "\n");
+
+ BS->resetSchedule();
+
+ // For the real scheduling we use a more sophisticated ready-list: it is
+ // sorted by the original instruction location. This lets the final schedule
+ // be as close as possible to the original instruction order.
+ struct ScheduleDataCompare {
+ bool operator()(ScheduleData *SD1, ScheduleData *SD2) {
+ return SD2->SchedulingPriority < SD1->SchedulingPriority;
+ }
+ };
+ std::set<ScheduleData *, ScheduleDataCompare> ReadyInsts;
+
+ // Ensure that all depencency data is updated and fill the ready-list with
+ // initial instructions.
+ int Idx = 0;
+ int NumToSchedule = 0;
+ for (auto *I = BS->ScheduleStart; I != BS->ScheduleEnd;
+ I = I->getNextNode()) {
+ ScheduleData *SD = BS->getScheduleData(I);
+ assert(
+ SD->isPartOfBundle() == (ScalarToTreeEntry.count(SD->Inst) != 0) &&
+ "scheduler and vectorizer have different opinion on what is a bundle");
+ SD->FirstInBundle->SchedulingPriority = Idx++;
+ if (SD->isSchedulingEntity()) {
+ BS->calculateDependencies(SD, false, this);
+ NumToSchedule++;
+ }
+ }
+ BS->initialFillReadyList(ReadyInsts);
+
+ Instruction *LastScheduledInst = BS->ScheduleEnd;
+
+ // Do the "real" scheduling.
+ while (!ReadyInsts.empty()) {
+ ScheduleData *picked = *ReadyInsts.begin();
+ ReadyInsts.erase(ReadyInsts.begin());
+
+ // Move the scheduled instruction(s) to their dedicated places, if not
+ // there yet.
+ ScheduleData *BundleMember = picked;
+ while (BundleMember) {
+ Instruction *pickedInst = BundleMember->Inst;
+ if (LastScheduledInst->getNextNode() != pickedInst) {
+ BS->BB->getInstList().remove(pickedInst);
+ BS->BB->getInstList().insert(LastScheduledInst, pickedInst);
+ }
+ LastScheduledInst = pickedInst;
+ BundleMember = BundleMember->NextInBundle;
+ }
+
+ BS->schedule(picked, ReadyInsts);
+ NumToSchedule--;
+ }
+ assert(NumToSchedule == 0 && "could not schedule all instructions");
+
+ // Avoid duplicate scheduling of the block.
+ BS->ScheduleStart = nullptr;
}
/// The SLPVectorizer Pass.
}
ScalarEvolution *SE;
- DataLayout *DL;
+ const DataLayout *DL;
TargetTransformInfo *TTI;
+ TargetLibraryInfo *TLI;
AliasAnalysis *AA;
LoopInfo *LI;
DominatorTree *DT;
+ AssumptionCache *AC;
+
+ bool runOnFunction(Function &F) override {
+ if (skipOptnoneFunction(F))
+ return false;
- virtual bool runOnFunction(Function &F) {
SE = &getAnalysis<ScalarEvolution>();
- DL = getAnalysisIfAvailable<DataLayout>();
+ DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
+ DL = DLP ? &DLP->getDataLayout() : nullptr;
TTI = &getAnalysis<TargetTransformInfo>();
+ TLI = getAnalysisIfAvailable<TargetLibraryInfo>();
AA = &getAnalysis<AliasAnalysis>();
LI = &getAnalysis<LoopInfo>();
- DT = &getAnalysis<DominatorTree>();
+ DT = &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
+ AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
StoreRefs.clear();
bool Changed = false;
DEBUG(dbgs() << "SLP: Analyzing blocks in " << F.getName() << ".\n");
- // Use the bollom up slp vectorizer to construct chains that start with
- // he store instructions.
- BoUpSLP R(&F, SE, DL, TTI, AA, LI, DT);
+ // Use the bottom up slp vectorizer to construct chains that start with
+ // store instructions.
+ BoUpSLP R(&F, SE, DL, TTI, TLI, AA, LI, DT, AC);
// Scan the blocks in the function in post order.
for (po_iterator<BasicBlock*> it = po_begin(&F.getEntryBlock()),
e = po_end(&F.getEntryBlock()); it != e; ++it) {
BasicBlock *BB = *it;
-
// Vectorize trees that end at stores.
if (unsigned count = collectStores(BB, R)) {
(void)count;
return Changed;
}
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ void getAnalysisUsage(AnalysisUsage &AU) const override {
FunctionPass::getAnalysisUsage(AU);
+ AU.addRequired<AssumptionCacheTracker>();
AU.addRequired<ScalarEvolution>();
AU.addRequired<AliasAnalysis>();
AU.addRequired<TargetTransformInfo>();
AU.addRequired<LoopInfo>();
- AU.addRequired<DominatorTree>();
+ AU.addRequired<DominatorTreeWrapperPass>();
AU.addPreserved<LoopInfo>();
- AU.addPreserved<DominatorTree>();
+ AU.addPreserved<DominatorTreeWrapperPass>();
AU.setPreservesCFG();
}
bool tryToVectorizePair(Value *A, Value *B, BoUpSLP &R);
/// \brief Try to vectorize a list of operands.
+ /// \@param BuildVector A list of users to ignore for the purpose of
+ /// scheduling and that don't need extracting.
/// \returns true if a value was vectorized.
- bool tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R);
+ bool tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R,
+ ArrayRef<Value *> BuildVector = None,
+ bool allowReorder = false);
/// \brief Try to vectorize a chain that may start at the operands of \V;
bool tryToVectorize(BinaryOperator *V, BoUpSLP &R);
StoreListMap StoreRefs;
};
-/// \brief Check that the Values in the slice in VL array are still existant in
+/// \brief Check that the Values in the slice in VL array are still existent in
/// the WeakVH array.
/// Vectorization of part of the VL array may cause later values in the VL array
/// to become invalid. We track when this has happened in the WeakVH array.
if (!isPowerOf2_32(Sz) || VF < 2)
return false;
- // Keep track of values that were delete by vectorizing in the loop below.
+ // Keep track of values that were deleted by vectorizing in the loop below.
SmallVector<WeakVH, 8> TrackValues(Chain.begin(), Chain.end());
bool Changed = false;
// Check that the pointer points to scalars.
Type *Ty = SI->getValueOperand()->getType();
if (Ty->isAggregateType() || Ty->isVectorTy())
- return 0;
+ continue;
// Find the base pointer.
Value *Ptr = GetUnderlyingObject(SI->getPointerOperand(), DL);
if (!A || !B)
return false;
Value *VL[] = { A, B };
- return tryToVectorizeList(VL, R);
+ return tryToVectorizeList(VL, R, None, true);
}
-bool SLPVectorizer::tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R) {
+bool SLPVectorizer::tryToVectorizeList(ArrayRef<Value *> VL, BoUpSLP &R,
+ ArrayRef<Value *> BuildVector,
+ bool allowReorder) {
if (VL.size() < 2)
return false;
bool Changed = false;
- // Keep track of values that were delete by vectorizing in the loop below.
+ // Keep track of values that were deleted by vectorizing in the loop below.
SmallVector<WeakVH, 8> TrackValues(VL.begin(), VL.end());
for (unsigned i = 0, e = VL.size(); i < e; ++i) {
<< "\n");
ArrayRef<Value *> Ops = VL.slice(i, OpsWidth);
- R.buildTree(Ops);
+ ArrayRef<Value *> BuildVectorSlice;
+ if (!BuildVector.empty())
+ BuildVectorSlice = BuildVector.slice(i, OpsWidth);
+
+ R.buildTree(Ops, BuildVectorSlice);
+ // TODO: check if we can allow reordering also for other cases than
+ // tryToVectorizePair()
+ if (allowReorder && R.shouldReorder()) {
+ assert(Ops.size() == 2);
+ assert(BuildVectorSlice.empty());
+ Value *ReorderedOps[] = { Ops[1], Ops[0] };
+ R.buildTree(ReorderedOps, None);
+ }
int Cost = R.getTreeCost();
if (Cost < -SLPCostThreshold) {
- DEBUG(dbgs() << "SLP: Vectorizing pair at cost:" << Cost << ".\n");
- R.vectorizeTree();
-
+ DEBUG(dbgs() << "SLP: Vectorizing list at cost:" << Cost << ".\n");
+ Value *VectorizedRoot = R.vectorizeTree();
+
+ // Reconstruct the build vector by extracting the vectorized root. This
+ // way we handle the case where some elements of the vector are undefined.
+ // (return (inserelt <4 xi32> (insertelt undef (opd0) 0) (opd1) 2))
+ if (!BuildVectorSlice.empty()) {
+ // The insert point is the last build vector instruction. The vectorized
+ // root will precede it. This guarantees that we get an instruction. The
+ // vectorized tree could have been constant folded.
+ Instruction *InsertAfter = cast<Instruction>(BuildVectorSlice.back());
+ unsigned VecIdx = 0;
+ for (auto &V : BuildVectorSlice) {
+ IRBuilder<true, NoFolder> Builder(
+ ++BasicBlock::iterator(InsertAfter));
+ InsertElementInst *IE = cast<InsertElementInst>(V);
+ Instruction *Extract = cast<Instruction>(Builder.CreateExtractElement(
+ VectorizedRoot, Builder.getInt32(VecIdx++)));
+ IE->setOperand(1, Extract);
+ IE->removeFromParent();
+ IE->insertAfter(Extract);
+ InsertAfter = IE;
+ }
+ }
// Move to the next bundle.
i += VF - 1;
Changed = true;
BinaryOperator *B0 = dyn_cast<BinaryOperator>(B->getOperand(0));
BinaryOperator *B1 = dyn_cast<BinaryOperator>(B->getOperand(1));
if (tryToVectorizePair(A, B0, R)) {
- B->moveBefore(V);
return true;
}
if (tryToVectorizePair(A, B1, R)) {
- B->moveBefore(V);
return true;
}
}
BinaryOperator *A0 = dyn_cast<BinaryOperator>(A->getOperand(0));
BinaryOperator *A1 = dyn_cast<BinaryOperator>(A->getOperand(1));
if (tryToVectorizePair(A0, B, R)) {
- A->moveBefore(V);
return true;
}
if (tryToVectorizePair(A1, B, R)) {
- A->moveBefore(V);
return true;
}
}
/// *p =
///
class HorizontalReduction {
- SmallPtrSet<Value *, 16> ReductionOps;
+ SmallVector<Value *, 16> ReductionOps;
SmallVector<Value *, 32> ReducedVals;
BinaryOperator *ReductionRoot;
public:
HorizontalReduction()
- : ReductionRoot(0), ReductionPHI(0), ReductionOpcode(0),
+ : ReductionRoot(nullptr), ReductionPHI(nullptr), ReductionOpcode(0),
ReducedValueOpcode(0), ReduxWidth(0), IsPairwiseReduction(false) {}
/// \brief Try to find a reduction tree.
bool matchAssociativeReduction(PHINode *Phi, BinaryOperator *B,
- DataLayout *DL) {
+ const DataLayout *DL) {
assert((!Phi ||
std::find(Phi->op_begin(), Phi->op_end(), B) != Phi->op_end()) &&
"Thi phi needs to use the binary operator");
// In such a case start looking for a tree rooted in the first '+'.
if (Phi) {
if (B->getOperand(0) == Phi) {
- Phi = 0;
+ Phi = nullptr;
B = dyn_cast<BinaryOperator>(B->getOperand(1));
} else if (B->getOperand(1) == Phi) {
- Phi = 0;
+ Phi = nullptr;
B = dyn_cast<BinaryOperator>(B->getOperand(0));
}
}
// We need to be able to reassociate the adds.
if (!TreeN->isAssociative())
return false;
- ReductionOps.insert(TreeN);
+ ReductionOps.push_back(TreeN);
}
// Retract.
Stack.pop_back();
if (NumReducedVals < ReduxWidth)
return false;
- Value *VectorizedTree = 0;
+ Value *VectorizedTree = nullptr;
IRBuilder<> Builder(ReductionRoot);
FastMathFlags Unsafe;
Unsafe.setUnsafeAlgebra();
unsigned i = 0;
for (; i < NumReducedVals - ReduxWidth + 1; i += ReduxWidth) {
- ArrayRef<Value *> ValsToReduce(&ReducedVals[i], ReduxWidth);
- V.buildTree(ValsToReduce, &ReductionOps);
+ V.buildTree(makeArrayRef(&ReducedVals[i], ReduxWidth), ReductionOps);
// Estimate cost.
int Cost = V.getTreeCost() + getReductionCost(TTI, ReducedVals[i]);
}
// Update users.
if (ReductionPHI) {
- assert(ReductionRoot != NULL && "Need a reduction operation");
+ assert(ReductionRoot && "Need a reduction operation");
ReductionRoot->setOperand(0, VectorizedTree);
ReductionRoot->setOperand(1, ReductionPHI);
} else
ReductionRoot->replaceAllUsesWith(VectorizedTree);
}
- return VectorizedTree != 0;
+ return VectorizedTree != nullptr;
}
private:
/// \brief Emit a horizontal reduction of the vectorized value.
Value *emitReduction(Value *VectorizedValue, IRBuilder<> &Builder) {
assert(VectorizedValue && "Need to have a vectorized tree node");
- Instruction *ValToReduce = dyn_cast<Instruction>(VectorizedValue);
assert(isPowerOf2_32(ReduxWidth) &&
"We only handle power-of-two reductions for now");
- Value *TmpVec = ValToReduce;
+ Value *TmpVec = VectorizedValue;
for (unsigned i = ReduxWidth / 2; i != 0; i >>= 1) {
if (IsPairwiseReduction) {
Value *LeftMask =
///
/// Returns true if it matches
///
-static bool findBuildVector(InsertElementInst *IE,
- SmallVectorImpl<Value *> &Ops) {
- if (!isa<UndefValue>(IE->getOperand(0)))
+static bool findBuildVector(InsertElementInst *FirstInsertElem,
+ SmallVectorImpl<Value *> &BuildVector,
+ SmallVectorImpl<Value *> &BuildVectorOpds) {
+ if (!isa<UndefValue>(FirstInsertElem->getOperand(0)))
return false;
+ InsertElementInst *IE = FirstInsertElem;
while (true) {
- Ops.push_back(IE->getOperand(1));
+ BuildVector.push_back(IE);
+ BuildVectorOpds.push_back(IE->getOperand(1));
if (IE->use_empty())
return false;
- InsertElementInst *NextUse = dyn_cast<InsertElementInst>(IE->use_back());
+ InsertElementInst *NextUse = dyn_cast<InsertElementInst>(IE->user_back());
if (!NextUse)
return true;
// Try to vectorize them.
unsigned NumElts = (SameTypeIt - IncIt);
DEBUG(errs() << "SLP: Trying to vectorize starting at PHIs (" << NumElts << ")\n");
- if (NumElts > 1 &&
- tryToVectorizeList(ArrayRef<Value *>(IncIt, NumElts), R)) {
+ if (NumElts > 1 && tryToVectorizeList(makeArrayRef(IncIt, NumElts), R)) {
// Success start over because instructions might have been changed.
HaveVectorizedPhiNodes = true;
Changed = true;
break;
}
- // Start over at the next instruction of a differnt type (or the end).
+ // Start over at the next instruction of a different type (or the end).
IncIt = SameTypeIt;
}
}
for (BasicBlock::iterator it = BB->begin(), e = BB->end(); it != e; it++) {
// We may go through BB multiple times so skip the one we have checked.
- if (!VisitedInstrs.insert(it))
+ if (!VisitedInstrs.insert(it).second)
continue;
if (isa<DbgInfoIntrinsic>(it))
Value *Rdx =
(P->getIncomingBlock(0) == BB
? (P->getIncomingValue(0))
- : (P->getIncomingBlock(1) == BB ? P->getIncomingValue(1) : 0));
+ : (P->getIncomingBlock(1) == BB ? P->getIncomingValue(1)
+ : nullptr));
// Check if this is a Binary Operator.
BinaryOperator *BI = dyn_cast_or_null<BinaryOperator>(Rdx);
if (!BI)
if (BinaryOperator *BinOp =
dyn_cast<BinaryOperator>(SI->getValueOperand())) {
HorizontalReduction HorRdx;
- if (((HorRdx.matchAssociativeReduction(0, BinOp, DL) &&
+ if (((HorRdx.matchAssociativeReduction(nullptr, BinOp, DL) &&
HorRdx.tryToReduce(R, TTI)) ||
tryToVectorize(BinOp, R))) {
Changed = true;
}
}
+ // Try to vectorize horizontal reductions feeding into a return.
+ if (ReturnInst *RI = dyn_cast<ReturnInst>(it))
+ if (RI->getNumOperands() != 0)
+ if (BinaryOperator *BinOp =
+ dyn_cast<BinaryOperator>(RI->getOperand(0))) {
+ DEBUG(dbgs() << "SLP: Found a return to vectorize.\n");
+ if (tryToVectorizePair(BinOp->getOperand(0),
+ BinOp->getOperand(1), R)) {
+ Changed = true;
+ it = BB->begin();
+ e = BB->end();
+ continue;
+ }
+ }
+
// Try to vectorize trees that start at compare instructions.
if (CmpInst *CI = dyn_cast<CmpInst>(it)) {
if (tryToVectorizePair(CI->getOperand(0), CI->getOperand(1), R)) {
}
for (int i = 0; i < 2; ++i) {
- if (BinaryOperator *BI = dyn_cast<BinaryOperator>(CI->getOperand(i))) {
- if (tryToVectorizePair(BI->getOperand(0), BI->getOperand(1), R)) {
- Changed = true;
- // We would like to start over since some instructions are deleted
- // and the iterator may become invalid value.
- it = BB->begin();
- e = BB->end();
- }
- }
+ if (BinaryOperator *BI = dyn_cast<BinaryOperator>(CI->getOperand(i))) {
+ if (tryToVectorizePair(BI->getOperand(0), BI->getOperand(1), R)) {
+ Changed = true;
+ // We would like to start over since some instructions are deleted
+ // and the iterator may become invalid value.
+ it = BB->begin();
+ e = BB->end();
+ }
+ }
}
continue;
}
// Try to vectorize trees that start at insertelement instructions.
- if (InsertElementInst *IE = dyn_cast<InsertElementInst>(it)) {
- SmallVector<Value *, 8> Ops;
- if (!findBuildVector(IE, Ops))
+ if (InsertElementInst *FirstInsertElem = dyn_cast<InsertElementInst>(it)) {
+ SmallVector<Value *, 16> BuildVector;
+ SmallVector<Value *, 16> BuildVectorOpds;
+ if (!findBuildVector(FirstInsertElem, BuildVector, BuildVectorOpds))
continue;
- if (tryToVectorizeList(Ops, R)) {
+ // Vectorize starting with the build vector operands ignoring the
+ // BuildVector instructions for the purpose of scheduling and user
+ // extraction.
+ if (tryToVectorizeList(BuildVectorOpds, R, BuildVector)) {
Changed = true;
it = BB->begin();
e = BB->end();
// Process the stores in chunks of 16.
for (unsigned CI = 0, CE = it->second.size(); CI < CE; CI+=16) {
unsigned Len = std::min<unsigned>(CE - CI, 16);
- ArrayRef<StoreInst *> Chunk(&it->second[CI], Len);
- Changed |= vectorizeStores(Chunk, -SLPCostThreshold, R);
+ Changed |= vectorizeStores(makeArrayRef(&it->second[CI], Len),
+ -SLPCostThreshold, R);
}
}
return Changed;
INITIALIZE_PASS_BEGIN(SLPVectorizer, SV_NAME, lv_name, false, false)
INITIALIZE_AG_DEPENDENCY(AliasAnalysis)
INITIALIZE_AG_DEPENDENCY(TargetTransformInfo)
+INITIALIZE_PASS_DEPENDENCY(AssumptionCacheTracker)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
INITIALIZE_PASS_DEPENDENCY(LoopSimplify)
INITIALIZE_PASS_END(SLPVectorizer, SV_NAME, lv_name, false, false)
projects / oota-llvm.git / blobdiff