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64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
//===- FormatVariadicBM.cpp - formatv() benchmark ---------- --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "benchmark/benchmark.h"
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#include "llvm/Support/FormatVariadic.h"
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#include <algorithm>
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#include <string>
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#include <vector>
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using namespace llvm;
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using namespace std;
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// Generate a list of format strings that have `NumReplacements` replacements
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// by permuting the replacements and some literal text.
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static vector<string> getFormatStrings(int NumReplacements) {
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vector<string> Components;
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for (int I = 0; I < NumReplacements; I++)
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Components.push_back("{" + to_string(I) + "}");
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// Intersperse these with some other literal text (_).
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const string_view Literal = "____";
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for (char C : Literal)
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Components.push_back(string(1, C));
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vector<string> Formats;
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do {
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string Concat;
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for (const string &C : Components)
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Concat += C;
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Formats.emplace_back(Concat);
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} while (next_permutation(Components.begin(), Components.end()));
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return Formats;
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}
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// Generate the set of formats to exercise outside the benchmark code.
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static const vector<vector<string>> Formats = {
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getFormatStrings(1), getFormatStrings(2), getFormatStrings(3),
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getFormatStrings(4), getFormatStrings(5),
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};
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// Benchmark formatv() for a variety of format strings and 1-5 replacements.
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static void BM_FormatVariadic(benchmark::State &state) {
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for (auto _ : state) {
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for (const string &Fmt : Formats[0])
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formatv(Fmt.c_str(), 1).str();
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for (const string &Fmt : Formats[1])
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formatv(Fmt.c_str(), 1, 2).str();
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for (const string &Fmt : Formats[2])
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formatv(Fmt.c_str(), 1, 2, 3).str();
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for (const string &Fmt : Formats[3])
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formatv(Fmt.c_str(), 1, 2, 3, 4).str();
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for (const string &Fmt : Formats[4])
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formatv(Fmt.c_str(), 1, 2, 3, 4, 5).str();
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}
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}
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BENCHMARK(BM_FormatVariadic);
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BENCHMARK_MAIN();
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