From 3a85daf21949eeec9a5af034cc47b883494bc501 Mon Sep 17 00:00:00 2001
From: Christian Trott <crtrott@sandia.gov>
Date: Sun, 5 Feb 2023 09:07:21 -0700
Subject: [PATCH 1/2] Adding some basic extents construction benchmark

---
 benchmarks/CMakeLists.txt           |  1 +
 benchmarks/extents/CMakeLists.txt   |  2 ++
 benchmarks/extents/extents_perf.cpp | 47 +++++++++++++++++++++++++++++
 3 files changed, 50 insertions(+)
 create mode 100644 benchmarks/extents/CMakeLists.txt
 create mode 100644 benchmarks/extents/extents_perf.cpp

diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
index 708cc9f3..42ac23df 100644
--- a/benchmarks/CMakeLists.txt
+++ b/benchmarks/CMakeLists.txt
@@ -65,6 +65,7 @@ function(mdspan_add_openmp_benchmark EXENAME)
   endif()
 endfunction()
 
+add_subdirectory(extents)
 add_subdirectory(sum)
 add_subdirectory(matvec)
 add_subdirectory(copy)
diff --git a/benchmarks/extents/CMakeLists.txt b/benchmarks/extents/CMakeLists.txt
new file mode 100644
index 00000000..60776db4
--- /dev/null
+++ b/benchmarks/extents/CMakeLists.txt
@@ -0,0 +1,2 @@
+
+mdspan_add_benchmark(extents_perf)
diff --git a/benchmarks/extents/extents_perf.cpp b/benchmarks/extents/extents_perf.cpp
new file mode 100644
index 00000000..daa977f4
--- /dev/null
+++ b/benchmarks/extents/extents_perf.cpp
@@ -0,0 +1,47 @@
+//@HEADER
+// ************************************************************************
+//
+//                        Kokkos v. 4.0
+//       Copyright (2022) National Technology & Engineering
+//               Solutions of Sandia, LLC (NTESS).
+//
+// Under the terms of Contract DE-NA0003525 with NTESS,
+// the U.S. Government retains certain rights in this software.
+//
+// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
+// See https://kokkos.org/LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//@HEADER
+#include <experimental/mdspan>
+
+#include <benchmark/benchmark.h>
+
+#include "fill.hpp"
+
+using index_type = int;
+
+namespace stdex = std::experimental;
+_MDSPAN_INLINE_VARIABLE constexpr auto dyn = stdex::dynamic_extent;
+
+template <class Extents, class ... Args>
+void extents_construction(benchmark::State& state, Extents, int R, Args ... args) {
+  for (auto _ : state) {
+    double val =0;
+    for(int r=0; r<R; r++) {
+       Extents ext(args...);
+       val += ext.extent(0);
+    }
+    if(val<1.0*R*10) std::terminate();
+  }
+}
+
+BENCHMARK_CAPTURE(
+  extents_construction, int_int_int, stdex::dextents<int,3>(), 100000000, 100, 100, 100
+);
+
+BENCHMARK_CAPTURE(
+  extents_construction, array_int_3, stdex::dextents<int,3>(), 100000000, std::array<int,3>{100, 100, 100}
+);
+
+BENCHMARK_MAIN();

From 8867df487067498518c269699c26dbe90244d194 Mon Sep 17 00:00:00 2001
From: Christian Trott <crtrott@sandia.gov>
Date: Mon, 16 Oct 2023 11:04:05 -0600
Subject: [PATCH 2/2] Update benchmarks/extents/extents_perf.cpp

Co-authored-by: Mark Hoemmen <mhoemmen@users.noreply.github.com>
---
 benchmarks/extents/extents_perf.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/benchmarks/extents/extents_perf.cpp b/benchmarks/extents/extents_perf.cpp
index daa977f4..3ca050d7 100644
--- a/benchmarks/extents/extents_perf.cpp
+++ b/benchmarks/extents/extents_perf.cpp
@@ -26,7 +26,7 @@ _MDSPAN_INLINE_VARIABLE constexpr auto dyn = stdex::dynamic_extent;
 
 template <class Extents, class ... Args>
 void extents_construction(benchmark::State& state, Extents, int R, Args ... args) {
-  for (auto _ : state) {
+  for ([[maybe_unused]] auto _ : state) {
     double val =0;
     for(int r=0; r<R; r++) {
        Extents ext(args...);