Re-apply the patch to improve the optimizations of memcpy's, with several

bugs fixed.  This now passes PPC bootstrap.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47026 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 0 deletions

diff --git a/include/llvm/Analysis/MemoryDependenceAnalysis.h b/include/llvm/Analysis/MemoryDependenceAnalysis.h
index 356f8214c3..c6ef41ff24 100644
--- a/include/llvm/Analysis/MemoryDependenceAnalysis.h
+++ b/include/llvm/Analysis/MemoryDependenceAnalysis.h
@@ -100,6 +100,11 @@ class MemoryDependenceAnalysis : public FunctionPass {
     /// updating the dependence of instructions that previously depended on it.
     void removeInstruction(Instruction* rem);
     
+    /// dropInstruction - Remove an instruction from the analysis, making 
+    /// absolutely conservative assumptions when updating the cache.  This is
+    /// useful, for example when an instruction is changed rather than removed.
+    void dropInstruction(Instruction* drop);
+    
   private:
     Instruction* getCallSiteDependency(CallSite C, Instruction* start,
                                        BasicBlock* block);