1 files changed, 4 insertions, 47 deletions

diff --git a/llvm/lib/Transforms/IPO/MergeFunctions.cpp b/llvm/lib/Transforms/IPO/MergeFunctions.cpp
index 0e478ba607b..a43b69f3413 100644
--- a/llvm/lib/Transforms/IPO/MergeFunctions.cpp
+++ b/llvm/lib/Transforms/IPO/MergeFunctions.cpp
@@ -119,7 +119,6 @@ using namespace llvm;
 
 STATISTIC(NumFunctionsMerged, "Number of functions merged");
 STATISTIC(NumThunksWritten, "Number of thunks generated");
-STATISTIC(NumAliasesWritten, "Number of aliases generated");
 STATISTIC(NumDoubleWeak, "Number of new functions created");
 
 static cl::opt<unsigned> NumFunctionsForSanityCheck(
@@ -179,8 +178,7 @@ class MergeFunctions : public ModulePass {
 public:
   static char ID;
   MergeFunctions()
-    : ModulePass(ID), FnTree(FunctionNodeCmp(&GlobalNumbers)), FNodesInTree(),
-      HasGlobalAliases(false) {
+    : ModulePass(ID), FnTree(FunctionNodeCmp(&GlobalNumbers)), FNodesInTree() {
     initializeMergeFunctionsPass(*PassRegistry::getPassRegistry());
   }
 
@@ -236,9 +234,6 @@ private:
   /// again.
   void mergeTwoFunctions(Function *F, Function *G);
 
-  /// Replace G with a thunk or an alias to F. Deletes G.
-  void writeThunkOrAlias(Function *F, Function *G);
-
   /// Fill PDIUnrelatedWL with instructions from the entry block that are
   /// unrelated to parameter related debug info.
   void filterInstsUnrelatedToPDI(BasicBlock *GEntryBlock,
@@ -256,9 +251,6 @@ private:
   /// delete G.
   void writeThunk(Function *F, Function *G);
 
-  /// Replace G with an alias to F. Deletes G.
-  void writeAlias(Function *F, Function *G);
-
   /// Replace function F with function G in the function tree.
   void replaceFunctionInTree(const FunctionNode &FN, Function *G);
 
@@ -271,9 +263,6 @@ private:
   // dangling iterators into FnTree. The invariant that preserves this is that
   // there is exactly one mapping F -> FN for each FunctionNode FN in FnTree.
   ValueMap<Function*, FnTreeType::iterator> FNodesInTree;
-
-  /// Whether or not the target supports global aliases.
-  bool HasGlobalAliases;
 };
 
 } // end anonymous namespace
@@ -454,19 +443,6 @@ void MergeFunctions::replaceDirectCallers(Function *Old, Function *New) {
   }
 }
 
-// Replace G with an alias to F if possible, or else a thunk to F. Deletes G.
-void MergeFunctions::writeThunkOrAlias(Function *F, Function *G) {
-  if (HasGlobalAliases && G->hasGlobalUnnamedAddr()) {
-    if (G->hasExternalLinkage() || G->hasLocalLinkage() ||
-        G->hasWeakLinkage()) {
-      writeAlias(F, G);
-      return;
-    }
-  }
-
-  writeThunk(F, G);
-}
-
 // Helper for writeThunk,
 // Selects proper bitcast operation,
 // but a bit simpler then CastInst::getCastOpcode.
@@ -734,20 +710,6 @@ void MergeFunctions::writeThunk(Function *F, Function *G) {
   ++NumThunksWritten;
 }
 
-// Replace G with an alias to F and delete G.
-void MergeFunctions::writeAlias(Function *F, Function *G) {
-  auto *GA = GlobalAlias::create(G->getLinkage(), "", F);
-  F->setAlignment(std::max(F->getAlignment(), G->getAlignment()));
-  GA->takeName(G);
-  GA->setVisibility(G->getVisibility());
-  removeUsers(G);
-  G->replaceAllUsesWith(GA);
-  G->eraseFromParent();
-
-  DEBUG(dbgs() << "writeAlias: " << GA->getName() << '\n');
-  ++NumAliasesWritten;
-}
-
 // Merge two equivalent functions. Upon completion, Function G is deleted.
 void MergeFunctions::mergeTwoFunctions(Function *F, Function *G) {
   if (F->isInterposable()) {
@@ -763,19 +725,14 @@ void MergeFunctions::mergeTwoFunctions(Function *F, Function *G) {
 
     unsigned MaxAlignment = std::max(G->getAlignment(), H->getAlignment());
 
-    if (HasGlobalAliases) {
-      writeAlias(F, G);
-      writeAlias(F, H);
-    } else {
-      writeThunk(F, G);
-      writeThunk(F, H);
-    }
+    writeThunk(F, G);
+    writeThunk(F, H);
 
     F->setAlignment(MaxAlignment);
     F->setLinkage(GlobalValue::PrivateLinkage);
     ++NumDoubleWeak;
   } else {
-    writeThunkOrAlias(F, G);
+    writeThunk(F, G);
   }
 
   ++NumFunctionsMerged;