Add start of filesystem benchmarks
llvm-svn: 285524
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: 3aa5478e212ced5f0f6ee61359d7ebbe167bbb10
diff --git a/benchmarks/filesystem.bench.cpp b/benchmarks/filesystem.bench.cpp
new file mode 100644
index 0000000..8dacbe6
--- /dev/null
+++ b/benchmarks/filesystem.bench.cpp
@@ -0,0 +1,90 @@
+#include <experimental/filesystem>
+
+#include "benchmark/benchmark_api.h"
+#include "GenerateInput.hpp"
+
+namespace fs = std::experimental::filesystem;
+
+static const size_t TestNumInputs = 1024;
+
+
+template <class GenInputs>
+void BM_PathConstructString(benchmark::State &st, GenInputs gen) {
+ using namespace fs;
+ const auto in = gen(st.range(0));
+ path PP;
+ for (auto& Part : in)
+ PP /= Part;
+ benchmark::DoNotOptimize(PP.native().data());
+ while (st.KeepRunning()) {
+ const path P(PP.native());
+ benchmark::DoNotOptimize(P.native().data());
+ }
+}
+BENCHMARK_CAPTURE(BM_PathConstructString, iterate_elements,
+ getRandomStringInputs)->Arg(TestNumInputs);
+
+
+template <class GenInputs>
+void BM_PathIterateMultipleTimes(benchmark::State &st, GenInputs gen) {
+ using namespace fs;
+ const auto in = gen(st.range(0));
+ path PP;
+ for (auto& Part : in)
+ PP /= Part;
+ benchmark::DoNotOptimize(PP.native().data());
+ while (st.KeepRunning()) {
+ for (auto &E : PP) {
+ benchmark::DoNotOptimize(E.native().data());
+ }
+ benchmark::ClobberMemory();
+ }
+}
+BENCHMARK_CAPTURE(BM_PathIterateMultipleTimes, iterate_elements,
+ getRandomStringInputs)->Arg(TestNumInputs);
+
+
+template <class GenInputs>
+void BM_PathIterateOnce(benchmark::State &st, GenInputs gen) {
+ using namespace fs;
+ const auto in = gen(st.range(0));
+ path PP;
+ for (auto& Part : in)
+ PP /= Part;
+ benchmark::DoNotOptimize(PP.native().data());
+ while (st.KeepRunning()) {
+ const path P = PP.native();
+ for (auto &E : P) {
+ benchmark::DoNotOptimize(E.native().data());
+ }
+ benchmark::ClobberMemory();
+ }
+}
+BENCHMARK_CAPTURE(BM_PathIterateOnce, iterate_elements,
+ getRandomStringInputs)->Arg(TestNumInputs);
+
+template <class GenInputs>
+void BM_PathIterateOnceBackwards(benchmark::State &st, GenInputs gen) {
+ using namespace fs;
+ const auto in = gen(st.range(0));
+ path PP;
+ for (auto& Part : in)
+ PP /= Part;
+ benchmark::DoNotOptimize(PP.native().data());
+ while (st.KeepRunning()) {
+ const path P = PP.native();
+ const auto B = P.begin();
+ auto I = P.end();
+ while (I != B) {
+ --I;
+ benchmark::DoNotOptimize(*I);
+ }
+ benchmark::DoNotOptimize(*I);
+ }
+}
+BENCHMARK_CAPTURE(BM_PathIterateOnceBackwards, iterate_elements,
+ getRandomStringInputs)->Arg(TestNumInputs);
+
+
+
+BENCHMARK_MAIN()