revert r177211 due to its potential issues

llvm-svn: 177222

1 files changed, 0 insertions, 12 deletions

diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 6438ebf846d..9e97bce6c3e 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -1705,18 +1705,6 @@ void CodeGenFunction::EmitFunctionEpilog(const CGFunctionInfo &FI) {
     llvm_unreachable("Invalid ABI kind for return argument");
   }
 
-  // If this function returns 'this' and the last instruction is a CallInst
-  // that returns 'this', use the return value from the CallInst. We will not
-  // need to keep 'this' alive through the callsite. It also enables
-  // optimizations in the backend, such as tail call optimization.
-  if (CalleeWithThisReturn && CGM.getCXXABI().HasThisReturn(CurGD)) {
-    llvm::BasicBlock *IP = Builder.GetInsertBlock();
-    llvm::CallInst *Callsite;
-    if (!IP->empty() && (Callsite = dyn_cast<llvm::CallInst>(&IP->back())) &&
-        Callsite->getCalledFunction() == CalleeWithThisReturn)
-      // Create a bitcast of Callsite.
-      RV = Builder.CreateBitCast(Callsite, RetAI.getCoerceToType());
-  }
   llvm::Instruction *Ret = RV ? Builder.CreateRet(RV) : Builder.CreateRetVoid();
   if (!RetDbgLoc.isUnknown())
     Ret->setDebugLoc(RetDbgLoc);