================
@@ -462,19 +468,24 @@ class vector {
   _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI void 
push_back(value_type&& __x) { emplace_back(std::move(__x)); }
 
   template <class... _Args>
-  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI
+  _LIBCPP_CONSTEXPR_SINCE_CXX20 _LIBCPP_HIDE_FROM_ABI __emplace_back_result_t 
emplace_back(_Args&&... __args) {
----------------
cjdb wrote:

Let's defer this change to a later PR (that I'll open ~soon). I had some fairly 
promising [codegen experiments](https://carbon.godbolt.org/z/PTqTrWs7d) with 
removing `__if_likely_else` before pushing the commit for review. I've been 
trying to get some macrobenchmarks since you've flagged, but it looks like 
there's a few blockers for a timely turnaround on that, and I don't want to 
block on something that can be done independently.

https://github.com/llvm/llvm-project/pull/155330
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