X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FAnalysis%2FMemoryDependenceAnalysis.h;h=d7d795e08a16eaa9469b5b0228a9b10b57008d5c;hb=b1d7a5d1146c30a54002b7ab49daf024e3174b95;hp=6a1df11eb924ee248da4ffde837eeceb52832857;hpb=6290f5cac23399201f8785e5ca8b305e42a1342c;p=oota-llvm.git diff --git a/include/llvm/Analysis/MemoryDependenceAnalysis.h b/include/llvm/Analysis/MemoryDependenceAnalysis.h index 6a1df11eb92..d7d795e08a1 100644 --- a/include/llvm/Analysis/MemoryDependenceAnalysis.h +++ b/include/llvm/Analysis/MemoryDependenceAnalysis.h @@ -18,6 +18,7 @@ #include "llvm/Pass.h" #include "llvm/ADT/DenseMap.h" #include "llvm/ADT/SmallPtrSet.h" +#include "llvm/ADT/OwningPtr.h" #include "llvm/ADT/PointerIntPair.h" namespace llvm { @@ -28,6 +29,7 @@ namespace llvm { class AliasAnalysis; class TargetData; class MemoryDependenceAnalysis; + class PredIteratorCache; /// MemDepResult - A memory dependence query can return one of three different /// answers, described below. @@ -102,10 +104,10 @@ namespace llvm { /// 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 @@ -153,23 +155,27 @@ namespace llvm { private: /// ValueIsLoadPair - This is a pair where the bool is true if /// the dependence is a read only dependence, false if read/write. - typedef PointerIntPair ValueIsLoadPair; - + typedef PointerIntPair 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 BBSkipFirstBlockPair; + /// CachedNonLocalPointerInfo - This map stores the cached results of doing - /// a pointer lookup at the bottom of a block. Key key of this map is the + /// 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 result> mappings. - typedef DenseMapCachedNonLocalPointerInfo; + typedef DenseMap > CachedNonLocalPointerInfo; CachedNonLocalPointerInfo NonLocalPointerDeps; // A map from instructions to their non-local pointer dependencies. - // The elements of the SmallPtrSet are ValueIsLoadPair's. typedef DenseMap > ReverseNonLocalPtrDepTy; + SmallPtrSet > 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 /// the bool indicates whether we have any dirty bits in the set. @@ -192,23 +198,18 @@ namespace llvm { /// Current AA implementation, just a cache. AliasAnalysis *AA; TargetData *TD; + OwningPtr 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(); - NonLocalPointerDeps.clear(); - ReverseLocalDeps.clear(); - ReverseNonLocalDeps.clear(); - ReverseNonLocalPtrDeps.clear(); - } - + void releaseMemory(); + /// getAnalysisUsage - Does not modify anything. It uses Value Numbering /// and Alias Analysis. /// @@ -219,8 +220,8 @@ namespace llvm { /// this on non-memory instructions. MemDepResult getDependency(Instruction *QueryInst); - /// 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. /// @@ -231,7 +232,7 @@ namespace llvm { /// 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 @@ -247,18 +248,32 @@ namespace llvm { /// 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); + private: MemDepResult getPointerDependencyFrom(Value *Pointer, uint64_t MemSize, bool isLoad, BasicBlock::iterator ScanIt, BasicBlock *BB); - MemDepResult getCallSiteDependencyFrom(CallSite C, + MemDepResult getCallSiteDependencyFrom(CallSite C, bool isReadOnlyCall, BasicBlock::iterator ScanIt, BasicBlock *BB); - void getNonLocalPointerDepInternal(Value *Pointer, uint64_t Size, - bool isLoad, BasicBlock *BB, - SmallVectorImpl &Result, - SmallPtrSet &Visited); + bool getNonLocalPointerDepFromBB(Value *Pointer, uint64_t Size, + bool isLoad, BasicBlock *BB, + SmallVectorImpl &Result, + DenseMap &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