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| author | dim <dim@FreeBSD.org> | 2011-02-20 12:57:14 +0000 |
|---|---|---|
| committer | dim <dim@FreeBSD.org> | 2011-02-20 12:57:14 +0000 |
| commit | cbb70ce070d220642b038ea101d9c0f9fbf860d6 (patch) | |
| tree | d2b61ce94e654cb01a254d2195259db5f9cc3f3c /include/llvm/Transforms/Utils/SSAUpdater.h | |
| parent | 4ace901e87dac5bbbac78ed325e75462e48e386e (diff) | |
| download | FreeBSD-src-cbb70ce070d220642b038ea101d9c0f9fbf860d6.zip FreeBSD-src-cbb70ce070d220642b038ea101d9c0f9fbf860d6.tar.gz | |
Vendor import of llvm trunk r126079:
http://llvm.org/svn/llvm-project/llvm/trunk@126079
Diffstat (limited to 'include/llvm/Transforms/Utils/SSAUpdater.h')
| -rw-r--r-- | include/llvm/Transforms/Utils/SSAUpdater.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/include/llvm/Transforms/Utils/SSAUpdater.h b/include/llvm/Transforms/Utils/SSAUpdater.h index e50a6b1..b4048b9 100644 --- a/include/llvm/Transforms/Utils/SSAUpdater.h +++ b/include/llvm/Transforms/Utils/SSAUpdater.h @@ -108,6 +108,55 @@ private: void operator=(const SSAUpdater&); // DO NOT IMPLEMENT SSAUpdater(const SSAUpdater&); // DO NOT IMPLEMENT }; + +/// LoadAndStorePromoter - This little helper class provides a convenient way to +/// promote a collection of loads and stores into SSA Form using the SSAUpdater. +/// This handles complexities that SSAUpdater doesn't, such as multiple loads +/// and stores in one block. +/// +/// Clients of this class are expected to subclass this and implement the +/// virtual methods. +/// +class LoadAndStorePromoter { +protected: + SSAUpdater &SSA; +public: + LoadAndStorePromoter(const SmallVectorImpl<Instruction*> &Insts, + SSAUpdater &S, StringRef Name = StringRef()); + virtual ~LoadAndStorePromoter() {} + + /// run - This does the promotion. Insts is a list of loads and stores to + /// promote, and Name is the basename for the PHIs to insert. After this is + /// complete, the loads and stores are removed from the code. + void run(const SmallVectorImpl<Instruction*> &Insts) const; + + + /// Return true if the specified instruction is in the Inst list (which was + /// passed into the run method). Clients should implement this with a more + /// efficient version if possible. + virtual bool isInstInList(Instruction *I, + const SmallVectorImpl<Instruction*> &Insts) const { + for (unsigned i = 0, e = Insts.size(); i != e; ++i) + if (Insts[i] == I) + return true; + return false; + } + + /// doExtraRewritesBeforeFinalDeletion - This hook is invoked after all the + /// stores are found and inserted as available values, but + virtual void doExtraRewritesBeforeFinalDeletion() const { + } + + /// replaceLoadWithValue - Clients can choose to implement this to get + /// notified right before a load is RAUW'd another value. + virtual void replaceLoadWithValue(LoadInst *LI, Value *V) const { + } + + /// This is called before each instruction is deleted. + virtual void instructionDeleted(Instruction *I) const { + } + +}; } // End llvm namespace |
