Add a flag to mark a dirty cache entry. This is not yet used, but will eventually

help non-local memdep caching.

llvm-svn: 42137

llvm/include/llvm/Analysis/MemoryDependenceAnalysis.h

@@ -59,6 +59,10 @@ class MemoryDependenceAnalysis : public FunctionPass {
     // Special marker indicating that the query has no dependency at all
     static Instruction* const None;
     
+    
+    // Special marker indicating a dirty cache entry
+    static Instruction* const Dirty;
+    
     static char ID; // Class identification, replacement for typeinfo
     MemoryDependenceAnalysis() : FunctionPass((intptr_t)&ID) {}
 

llvm/lib/Analysis/MemoryDependenceAnalysis.cpp

@@ -34,6 +34,7 @@ char MemoryDependenceAnalysis::ID = 0;
   
 Instruction* const MemoryDependenceAnalysis::NonLocal = (Instruction*)-3;
 Instruction* const MemoryDependenceAnalysis::None = (Instruction*)-4;
+Instruction* const MemoryDependenceAnalysis::Dirty = (Instruction*)-5;
   
 // Register this pass...
 static RegisterPass<MemoryDependenceAnalysis> X("memdep",