[MemorySSA] Remove unused dominatesUse (NFC)

The function was introduced without a use on Feb 2, 2016 in commit
e1100f533f0a48f55e80e1152b06f5deab5f9b30.

diff --git a/llvm/include/llvm/Analysis/MemorySSA.h b/llvm/include/llvm/Analysis/MemorySSA.h
index 5dfae50..63c031b 100644 (file)
--- a/llvm/include/llvm/Analysis/MemorySSA.h
+++ b/llvm/include/llvm/Analysis/MemorySSA.h
@@ -850,7 +850,6 @@ private:
   using DefsMap = DenseMap<const BasicBlock *, std::unique_ptr<DefsList>>;
 
   void markUnreachableAsLiveOnEntry(BasicBlock *BB);
-  bool dominatesUse(const MemoryAccess *, const MemoryAccess *) const;
   MemoryPhi *createMemoryPhi(BasicBlock *BB);
   template <typename AliasAnalysisType>
   MemoryUseOrDef *createNewAccess(Instruction *, AliasAnalysisType *,

diff --git a/llvm/lib/Analysis/MemorySSA.cpp b/llvm/lib/Analysis/MemorySSA.cpp
index e728a5f..f0d27e0 100644 (file)
--- a/llvm/lib/Analysis/MemorySSA.cpp
+++ b/llvm/lib/Analysis/MemorySSA.cpp
@@ -1817,23 +1817,6 @@ MemoryUseOrDef *MemorySSA::createNewAccess(Instruction *I,
   return MUD;
 }
 
-/// Returns true if \p Replacer dominates \p Replacee .
-bool MemorySSA::dominatesUse(const MemoryAccess *Replacer,
-                             const MemoryAccess *Replacee) const {
-  if (isa<MemoryUseOrDef>(Replacee))
-    return DT->dominates(Replacer->getBlock(), Replacee->getBlock());
-  const auto *MP = cast<MemoryPhi>(Replacee);
-  // For a phi node, the use occurs in the predecessor block of the phi node.
-  // Since we may occur multiple times in the phi node, we have to check each
-  // operand to ensure Replacer dominates each operand where Replacee occurs.
-  for (const Use &Arg : MP->operands()) {
-    if (Arg.get() != Replacee &&
-        !DT->dominates(Replacer->getBlock(), MP->getIncomingBlock(Arg)))
-      return false;
-  }
-  return true;
-}
-
 /// Properly remove \p MA from all of MemorySSA's lookup tables.
 void MemorySSA::removeFromLookups(MemoryAccess *MA) {
   assert(MA->use_empty() &&