1 #include "benchmark/benchmark.h"
2 #include "test_macros.h"
3
4 #include <mutex>
5 #include <sstream>
6
7 TEST_NOINLINE double istream_numbers();
8
istream_numbers(std::locale * loc)9 double istream_numbers(std::locale* loc) {
10 const char* a[] = {"-6 69 -71 2.4882e-02 -100 101 -2.00005 5000000 -50000000",
11 "-25 71 7 -9.3262e+01 -100 101 -2.00005 5000000 -50000000",
12 "-14 53 46 -6.7026e-02 -100 101 -2.00005 5000000 -50000000"};
13
14 int a1, a2, a3, a4, a5, a6, a7;
15 double f1 = 0.0, f2 = 0.0, q = 0.0;
16 for (int i = 0; i < 3; i++) {
17 std::istringstream s(a[i]);
18 if (loc)
19 s.imbue(*loc);
20 s >> a1 >> a2 >> a3 >> f1 >> a4 >> a5 >> f2 >> a6 >> a7;
21 q += (a1 + a2 + a3 + a4 + a5 + a6 + a7 + f1 + f2) / 1000000;
22 }
23 return q;
24 }
25
26 struct LocaleSelector {
27 std::locale* imbue;
28 std::locale old;
29 static std::mutex mutex;
30
LocaleSelectorLocaleSelector31 LocaleSelector(benchmark::State& state) {
32 std::lock_guard guard(mutex);
33 switch (state.range(0)) {
34 case 0: {
35 old = std::locale::global(std::locale::classic());
36 imbue = nullptr;
37 break;
38 }
39 case 1: {
40 old = std::locale::global(std::locale::classic());
41 thread_local std::locale loc("en_US.UTF-8");
42 imbue = &loc;
43 break;
44 }
45 case 2: {
46 old = std::locale::global(std::locale::classic());
47 static std::locale loc("en_US.UTF-8");
48 imbue = &loc;
49 break;
50 }
51 case 3: {
52 old = std::locale::global(std::locale("en_US.UTF-8"));
53 imbue = nullptr;
54 break;
55 }
56 }
57 }
58
~LocaleSelectorLocaleSelector59 ~LocaleSelector() {
60 std::lock_guard guard(mutex);
61 std::locale::global(old);
62 }
63 };
64
65 std::mutex LocaleSelector::mutex;
66
BM_Istream_numbers(benchmark::State & state)67 static void BM_Istream_numbers(benchmark::State& state) {
68 LocaleSelector sel(state);
69 double i = 0;
70 while (state.KeepRunning())
71 benchmark::DoNotOptimize(i += istream_numbers(sel.imbue));
72 }
73 BENCHMARK(BM_Istream_numbers)->DenseRange(0, 3)->UseRealTime()->Threads(1)->ThreadPerCpu();
74
BM_Ostream_number(benchmark::State & state)75 static void BM_Ostream_number(benchmark::State& state) {
76 LocaleSelector sel(state);
77 while (state.KeepRunning()) {
78 std::ostringstream ss;
79 if (sel.imbue)
80 ss.imbue(*sel.imbue);
81 ss << 0;
82 benchmark::DoNotOptimize(ss.str().c_str());
83 }
84 }
85 BENCHMARK(BM_Ostream_number)->DenseRange(0, 3)->UseRealTime()->Threads(1)->ThreadPerCpu();
86
87 BENCHMARK_MAIN();
88