2 files changed, 25 insertions, 0 deletions
diff --git a/libcxx/benchmarks/ContainerBenchmarks.hpp b/libcxx/benchmarks/ContainerBenchmarks.hpp
index 509e3d23ed9..648617a9cd2 100644
--- a/libcxx/benchmarks/ContainerBenchmarks.hpp
+++ b/libcxx/benchmarks/ContainerBenchmarks.hpp
@@ -7,6 +7,23 @@
 
 namespace ContainerBenchmarks {
 
+template <class Container>
+void BM_ConstructSize(benchmark::State& st, Container) {
+  auto size = st.range(0);
+  for (auto _ : st) {
+    Container c(size);
+    benchmark::DoNotOptimize(c.data());
+  }
+}
+
+template <class Container>
+void BM_ConstructSizeValue(benchmark::State& st, Container, typename Container::value_type const& val) {
+  const auto size = st.range(0);
+  for (auto _ : st) {
+    Container c(size, val);
+    benchmark::DoNotOptimize(c.data());
+  }
+}
 
 template <class Container, class GenInputs>
 void BM_ConstructIterIter(benchmark::State& st, Container, GenInputs gen) {
diff --git a/libcxx/benchmarks/vector_operations.bench.cpp b/libcxx/benchmarks/vector_operations.bench.cpp
index a2c4e5dbbc0..c41259eaac3 100644
--- a/libcxx/benchmarks/vector_operations.bench.cpp
+++ b/libcxx/benchmarks/vector_operations.bench.cpp
@@ -13,6 +13,14 @@ using namespace ContainerBenchmarks;
 
 constexpr std::size_t TestNumInputs = 1024;
 
+BENCHMARK_CAPTURE(BM_ConstructSize,
+    vector_byte,
+    std::vector<unsigned char>{})->Arg(5140480);
+
+BENCHMARK_CAPTURE(BM_ConstructSizeValue,
+    vector_byte,
+    std::vector<unsigned char>{}, 0)->Arg(5140480);
+
 BENCHMARK_CAPTURE(BM_ConstructIterIter,
   vector_char,
   std::vector<char>{},