1 files changed, 36 insertions, 0 deletions
diff --git a/libcxx/utils/google-benchmark/test/donotoptimize_test.cc b/libcxx/utils/google-benchmark/test/donotoptimize_test.cc
new file mode 100644
index 00000000000..e4453fbbcf8
--- /dev/null
+++ b/libcxx/utils/google-benchmark/test/donotoptimize_test.cc
@@ -0,0 +1,36 @@
+#include "benchmark/benchmark.h"
+
+#include <cstdint>
+
+namespace {
+#if defined(__GNUC__)
+  std::uint64_t double_up(const std::uint64_t x) __attribute__ ((const));
+#endif
+  std::uint64_t double_up(const std::uint64_t x) {
+    return x * 2;
+  }
+}
+
+int main(int, char*[]) {
+
+  // this test verifies compilation of DoNotOptimize() for some types
+
+  char buffer8[8];
+  benchmark::DoNotOptimize(buffer8);
+
+  char buffer20[20];
+  benchmark::DoNotOptimize(buffer20);
+
+  char buffer1024[1024];
+  benchmark::DoNotOptimize(buffer1024);
+  benchmark::DoNotOptimize(&buffer1024[0]);
+
+  int x = 123;
+  benchmark::DoNotOptimize(x);
+  benchmark::DoNotOptimize(&x);
+  benchmark::DoNotOptimize(x += 42);
+
+  benchmark::DoNotOptimize(double_up(x));
+
+  return 0;
+}