Set and use Elidable in elimination of copy ctors.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@78331 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 9 deletions

diff --git a/lib/CodeGen/CGCXX.cpp b/lib/CodeGen/CGCXX.cpp
index 567c58373c..0d51c03bab 100644
--- a/lib/CodeGen/CGCXX.cpp
+++ b/lib/CodeGen/CGCXX.cpp
@@ -258,16 +258,10 @@ CodeGenFunction::EmitCXXConstructExpr(llvm::Value *Dest,
 
   // Code gen optimization to eliminate copy constructor and return 
   // its first argument instead.
-  const CXXConstructorDecl *CDecl = E->getConstructor();
-  if (E->getNumArgs() == 1 &&
-      CDecl->isCopyConstructor(getContext())) {
+  if (E->isElidable()) {
     CXXConstructExpr::const_arg_iterator i = E->arg_begin();
-    const Expr *SubExpr = (*i);
-    // FIXME. Any other cases can be optimized away?
-    if (isa<CallExpr>(SubExpr) || isa<CXXTemporaryObjectExpr>(SubExpr)) {
-      EmitAggExpr(SubExpr, Dest, false);
-      return;
-    }
+    EmitAggExpr((*i), Dest, false);
+    return;
   }
   // Call the constructor.
   EmitCXXConstructorCall(E->getConstructor(), Ctor_Complete, Dest,