1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // UNSUPPORTED: c++03, c++11, c++14 10 11 #include "benchmark/benchmark.h" 12 #include "test_macros.h" 13 14 #include <mutex> 15 #include <sstream> 16 17 TEST_NOINLINE double istream_numbers(); 18 19 double istream_numbers(std::locale* loc) { 20 const char* a[] = {"-6 69 -71 2.4882e-02 -100 101 -2.00005 5000000 -50000000", 21 "-25 71 7 -9.3262e+01 -100 101 -2.00005 5000000 -50000000", 22 "-14 53 46 -6.7026e-02 -100 101 -2.00005 5000000 -50000000"}; 23 24 int a1, a2, a3, a4, a5, a6, a7; 25 double f1 = 0.0, f2 = 0.0, q = 0.0; 26 for (int i = 0; i < 3; i++) { 27 std::istringstream s(a[i]); 28 if (loc) 29 s.imbue(*loc); 30 s >> a1 >> a2 >> a3 >> f1 >> a4 >> a5 >> f2 >> a6 >> a7; 31 q += (a1 + a2 + a3 + a4 + a5 + a6 + a7 + f1 + f2) / 1000000; 32 } 33 return q; 34 } 35 36 struct LocaleSelector { 37 std::locale* imbue; 38 std::locale old; 39 static std::mutex mutex; 40 41 LocaleSelector(benchmark::State& state) { 42 std::lock_guard guard(mutex); 43 switch (state.range(0)) { 44 case 0: { 45 old = std::locale::global(std::locale::classic()); 46 imbue = nullptr; 47 break; 48 } 49 case 1: { 50 old = std::locale::global(std::locale::classic()); 51 thread_local std::locale loc("en_US.UTF-8"); 52 imbue = &loc; 53 break; 54 } 55 case 2: { 56 old = std::locale::global(std::locale::classic()); 57 static std::locale loc("en_US.UTF-8"); 58 imbue = &loc; 59 break; 60 } 61 case 3: { 62 old = std::locale::global(std::locale("en_US.UTF-8")); 63 imbue = nullptr; 64 break; 65 } 66 } 67 } 68 69 ~LocaleSelector() { 70 std::lock_guard guard(mutex); 71 std::locale::global(old); 72 } 73 }; 74 75 std::mutex LocaleSelector::mutex; 76 77 static void BM_Istream_numbers(benchmark::State& state) { 78 LocaleSelector sel(state); 79 double i = 0; 80 while (state.KeepRunning()) 81 benchmark::DoNotOptimize(i += istream_numbers(sel.imbue)); 82 } 83 BENCHMARK(BM_Istream_numbers)->DenseRange(0, 3)->UseRealTime()->Threads(1)->ThreadPerCpu(); 84 85 static void BM_Ostream_number(benchmark::State& state) { 86 LocaleSelector sel(state); 87 while (state.KeepRunning()) { 88 std::ostringstream ss; 89 if (sel.imbue) 90 ss.imbue(*sel.imbue); 91 ss << 0; 92 benchmark::DoNotOptimize(ss.str().c_str()); 93 } 94 } 95 BENCHMARK(BM_Ostream_number)->DenseRange(0, 3)->UseRealTime()->Threads(1)->ThreadPerCpu(); 96 97 BENCHMARK_MAIN(); 98