#include "llvm/BasicBlock.h"
#include "llvm/Pass.h"
+#include "llvm/Support/ValueHandle.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/PointerIntPair.h"
namespace llvm {
class AliasAnalysis;
class TargetData;
class MemoryDependenceAnalysis;
+ class PredIteratorCache;
+ class DominatorTree;
+ class PHITransAddr;
/// MemDepResult - A memory dependence query can return one of three different
/// answers, described below.
/// Invalid - Clients of MemDep never see this.
Invalid = 0,
- /// Normal - This is a normal instruction dependence. The pointer member
- /// of the MemDepResult pair holds the instruction.
- Normal,
+ /// Clobber - This is a dependence on the specified instruction which
+ /// clobbers the desired value. The pointer member of the MemDepResult
+ /// pair holds the instruction that clobbers the memory. For example,
+ /// this occurs when we see a may-aliased store to the memory location we
+ /// care about.
+ Clobber,
+ /// Def - This is a dependence on the specified instruction which
+ /// defines/produces the desired memory location. The pointer member of
+ /// the MemDepResult pair holds the instruction that defines the memory.
+ /// Cases of interest:
+ /// 1. This could be a load or store for dependence queries on
+ /// load/store. The value loaded or stored is the produced value.
+ /// Note that the pointer operand may be different than that of the
+ /// queried pointer due to must aliases and phi translation. Note
+ /// that the def may not be the same type as the query, the pointers
+ /// may just be must aliases.
+ /// 2. For loads and stores, this could be an allocation instruction. In
+ /// this case, the load is loading an undef value or a store is the
+ /// first store to (that part of) the allocation.
+ /// 3. Dependence queries on calls return Def only when they are
+ /// readonly calls or memory use intrinsics with identical callees
+ /// and no intervening clobbers. No validation is done that the
+ /// operands to the calls are the same.
+ Def,
+
/// NonLocal - This marker indicates that the query has no dependency in
/// the specified block. To find out more, the client should query other
/// predecessor blocks.
- NonLocal,
-
- /// None - This dependence type indicates that the query does not depend
- /// on any instructions, either because it is not a memory instruction or
- /// because it scanned to the definition of the memory (alloca/malloc)
- /// being accessed.
- None
+ NonLocal
};
typedef PointerIntPair<Instruction*, 2, DepType> PairTy;
PairTy Value;
/// get methods: These are static ctor methods for creating various
/// MemDepResult kinds.
- static MemDepResult get(Instruction *Inst) {
- return MemDepResult(PairTy(Inst, Normal));
+ static MemDepResult getDef(Instruction *Inst) {
+ return MemDepResult(PairTy(Inst, Def));
+ }
+ static MemDepResult getClobber(Instruction *Inst) {
+ return MemDepResult(PairTy(Inst, Clobber));
}
static MemDepResult getNonLocal() {
return MemDepResult(PairTy(0, NonLocal));
}
- static MemDepResult getNone() {
- return MemDepResult(PairTy(0, None));
- }
- /// isNormal - Return true if this MemDepResult represents a query that is
- /// a normal instruction dependency.
- bool isNormal() const { return Value.getInt() == Normal; }
+ /// isClobber - Return true if this MemDepResult represents a query that is
+ /// a instruction clobber dependency.
+ bool isClobber() const { return Value.getInt() == Clobber; }
+
+ /// isDef - Return true if this MemDepResult represents a query that is
+ /// a instruction definition dependency.
+ bool isDef() const { return Value.getInt() == Def; }
- /// isNonLocal - Return true if this MemDepResult represents an query that
+ /// isNonLocal - Return true if this MemDepResult represents a query that
/// is transparent to the start of the block, but where a non-local hasn't
/// been done.
bool isNonLocal() const { return Value.getInt() == NonLocal; }
- /// isNone - Return true if this MemDepResult represents a query that
- /// doesn't depend on any instruction.
- bool isNone() const { return Value.getInt() == None; }
-
/// getInst() - If this is a normal dependency, return the instruction that
/// is depended on. Otherwise, return null.
Instruction *getInst() const { return Value.getPointer(); }
- bool operator==(const MemDepResult &M) const { return M.Value == Value; }
- bool operator!=(const MemDepResult &M) const { return M.Value != Value; }
- bool operator<(const MemDepResult &M) const { return M.Value < Value; }
- bool operator>(const MemDepResult &M) const { return M.Value > Value; }
+ bool operator==(const MemDepResult &M) const { return Value == M.Value; }
+ bool operator!=(const MemDepResult &M) const { return Value != M.Value; }
+ bool operator<(const MemDepResult &M) const { return Value < M.Value; }
+ bool operator>(const MemDepResult &M) const { return Value > M.Value; }
private:
friend class MemoryDependenceAnalysis;
/// Dirty - Entries with this marker occur in a LocalDeps map or
}
};
+ /// NonLocalDepResult - This is a result from a NonLocal dependence query.
+ /// For each BasicBlock (the BB entry) it keeps a MemDepResult and the
+ /// (potentially phi translated) address that was live in the block.
+ class NonLocalDepResult {
+ BasicBlock *BB;
+ MemDepResult Result;
+ Value *Address;
+ public:
+ NonLocalDepResult(BasicBlock *bb, MemDepResult result, Value *address)
+ : BB(bb), Result(result), Address(address) {}
+
+ // BB is the sort key, it can't be changed.
+ BasicBlock *getBB() const { return BB; }
+
+ void setResult(const MemDepResult &R, Value *Addr) {
+ Result = R;
+ Address = Addr;
+ }
+
+ const MemDepResult &getResult() const { return Result; }
+
+ /// getAddress - Return the address of this pointer in this block. This can
+ /// be different than the address queried for the non-local result because
+ /// of phi translation. This returns null if the address was not available
+ /// in a block (i.e. because phi translation failed) or if this is a cached
+ /// result and that address was deleted.
+ ///
+ /// The address is always null for a non-local 'call' dependence.
+ Value *getAddress() const { return Address; }
+ };
+
+ /// NonLocalDepEntry - This is an entry in the NonLocalDepInfo cache. For
+ /// each BasicBlock (the BB entry) it keeps a MemDepResult.
+ class NonLocalDepEntry {
+ BasicBlock *BB;
+ MemDepResult Result;
+ public:
+ NonLocalDepEntry(BasicBlock *bb, MemDepResult result)
+ : BB(bb), Result(result) {}
+
+ // This is used for searches.
+ NonLocalDepEntry(BasicBlock *bb) : BB(bb) {}
+
+ // BB is the sort key, it can't be changed.
+ BasicBlock *getBB() const { return BB; }
+
+ void setResult(const MemDepResult &R) { Result = R; }
+
+ const MemDepResult &getResult() const { return Result; }
+
+ bool operator<(const NonLocalDepEntry &RHS) const {
+ return BB < RHS.BB;
+ }
+ };
+
/// MemoryDependenceAnalysis - This is an analysis that determines, for a
/// given memory operation, what preceding memory operations it depends on.
/// It builds on alias analysis information, and tries to provide a lazy,
LocalDepMapType LocalDeps;
public:
- typedef std::pair<BasicBlock*, MemDepResult> NonLocalDepEntry;
typedef std::vector<NonLocalDepEntry> NonLocalDepInfo;
private:
+ /// ValueIsLoadPair - This is a pair<Value*, bool> where the bool is true if
+ /// the dependence is a read only dependence, false if read/write.
+ typedef PointerIntPair<Value*, 1, bool> ValueIsLoadPair;
+
+ /// BBSkipFirstBlockPair - This pair is used when caching information for a
+ /// block. If the pointer is null, the cache value is not a full query that
+ /// starts at the specified block. If non-null, the bool indicates whether
+ /// or not the contents of the block was skipped.
+ typedef PointerIntPair<BasicBlock*, 1, bool> BBSkipFirstBlockPair;
+
+ /// CachedNonLocalPointerInfo - This map stores the cached results of doing
+ /// a pointer lookup at the bottom of a block. The key of this map is the
+ /// pointer+isload bit, the value is a list of <bb->result> mappings.
+ typedef DenseMap<ValueIsLoadPair, std::pair<BBSkipFirstBlockPair,
+ NonLocalDepInfo> > CachedNonLocalPointerInfo;
+ CachedNonLocalPointerInfo NonLocalPointerDeps;
+
+ // A map from instructions to their non-local pointer dependencies.
+ typedef DenseMap<Instruction*,
+ SmallPtrSet<ValueIsLoadPair, 4> > ReverseNonLocalPtrDepTy;
+ ReverseNonLocalPtrDepTy ReverseNonLocalPtrDeps;
+
/// PerInstNLInfo - This is the instruction we keep for each cached access
/// that we have for an instruction. The pointer is an owning pointer and
SmallPtrSet<Instruction*, 4> > ReverseDepMapType;
ReverseDepMapType ReverseLocalDeps;
- // A reverse mapping form dependencies to the non-local dependees.
+ // A reverse mapping from dependencies to the non-local dependees.
ReverseDepMapType ReverseNonLocalDeps;
/// Current AA implementation, just a cache.
AliasAnalysis *AA;
TargetData *TD;
+ OwningPtr<PredIteratorCache> PredCache;
public:
- MemoryDependenceAnalysis() : FunctionPass(&ID) {}
+ MemoryDependenceAnalysis();
+ ~MemoryDependenceAnalysis();
static char ID;
/// Pass Implementation stuff. This doesn't do any analysis eagerly.
bool runOnFunction(Function &);
/// Clean up memory in between runs
- void releaseMemory() {
- LocalDeps.clear();
- NonLocalDeps.clear();
- NonLocalDeps.clear();
- ReverseLocalDeps.clear();
- ReverseNonLocalDeps.clear();
- }
-
+ void releaseMemory();
+
/// getAnalysisUsage - Does not modify anything. It uses Value Numbering
/// and Alias Analysis.
///
/// this on non-memory instructions.
MemDepResult getDependency(Instruction *QueryInst);
- /// getDependencyFrom - Return the instruction on which the memory operation
- /// 'QueryInst' depends. This starts scanning from the instruction before
- /// the position indicated by ScanIt.
- ///
- /// Note that this method does no caching at all. You should use
- /// getDependency where possible.
- MemDepResult getDependencyFrom(Instruction *QueryInst,
- BasicBlock::iterator ScanIt, BasicBlock *BB);
-
-
- /// getNonLocalDependency - Perform a full dependency query for the
- /// specified instruction, returning the set of blocks that the value is
+ /// getNonLocalCallDependency - Perform a full dependency query for the
+ /// specified call, returning the set of blocks that the value is
/// potentially live across. The returned set of results will include a
/// "NonLocal" result for all blocks where the value is live across.
///
/// invalidated on the next non-local query or when an instruction is
/// removed. Clients must copy this data if they want it around longer than
/// that.
- const NonLocalDepInfo &getNonLocalDependency(Instruction *QueryInst);
+ const NonLocalDepInfo &getNonLocalCallDependency(CallSite QueryCS);
+
+
+ /// getNonLocalPointerDependency - Perform a full dependency query for an
+ /// access to the specified (non-volatile) memory location, returning the
+ /// set of instructions that either define or clobber the value.
+ ///
+ /// This method assumes the pointer has a "NonLocal" dependency within BB.
+ void getNonLocalPointerDependency(Value *Pointer, bool isLoad,
+ BasicBlock *BB,
+ SmallVectorImpl<NonLocalDepResult> &Result);
/// removeInstruction - Remove an instruction from the dependence analysis,
/// updating the dependence of instructions that previously depended on it.
void removeInstruction(Instruction *InstToRemove);
+ /// invalidateCachedPointerInfo - This method is used to invalidate cached
+ /// information about the specified pointer, because it may be too
+ /// conservative in memdep. This is an optional call that can be used when
+ /// the client detects an equivalence between the pointer and some other
+ /// value and replaces the other value with ptr. This can make Ptr available
+ /// in more places that cached info does not necessarily keep.
+ void invalidateCachedPointerInfo(Value *Ptr);
+
+ /// invalidateCachedPredecessors - Clear the PredIteratorCache info.
+ /// This needs to be done when the CFG changes, e.g., due to splitting
+ /// critical edges.
+ void invalidateCachedPredecessors();
+
private:
+ MemDepResult getPointerDependencyFrom(Value *Pointer, uint64_t MemSize,
+ bool isLoad,
+ BasicBlock::iterator ScanIt,
+ BasicBlock *BB);
+ MemDepResult getCallSiteDependencyFrom(CallSite C, bool isReadOnlyCall,
+ BasicBlock::iterator ScanIt,
+ BasicBlock *BB);
+ bool getNonLocalPointerDepFromBB(const PHITransAddr &Pointer, uint64_t Size,
+ bool isLoad, BasicBlock *BB,
+ SmallVectorImpl<NonLocalDepResult> &Result,
+ DenseMap<BasicBlock*, Value*> &Visited,
+ bool SkipFirstBlock = false);
+ MemDepResult GetNonLocalInfoForBlock(Value *Pointer, uint64_t PointeeSize,
+ bool isLoad, BasicBlock *BB,
+ NonLocalDepInfo *Cache,
+ unsigned NumSortedEntries);
+
+ void RemoveCachedNonLocalPointerDependencies(ValueIsLoadPair P);
+
/// verifyRemoved - Verify that the specified instruction does not occur
/// in our internal data structures.
void verifyRemoved(Instruction *Inst) const;
- MemDepResult getCallSiteDependency(CallSite C, BasicBlock::iterator ScanIt,
- BasicBlock *BB);
};
} // End llvm namespace