libc/benchmarks/LibcBenchmark.cpp

   1 //===-- Benchmark function -----------------------------------------------===//
   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 #include "LibcBenchmark.h"
  10 #include "llvm/ADT/StringRef.h"
  11 #include "llvm/TargetParser/Host.h"
  12
  13 namespace llvm {
  14 namespace libc_benchmarks {
  15
  16 void checkRequirements() {
  17   const auto &CpuInfo = benchmark::CPUInfo::Get();
  18   if (CpuInfo.scaling == benchmark::CPUInfo::ENABLED)
  19     report_fatal_error(
  20         "CPU scaling is enabled, the benchmark real time measurements may be "
  21         "noisy and will incur extra overhead.");
  22 }
  23
  24 HostState HostState::get() {
  25   const auto &CpuInfo = benchmark::CPUInfo::Get();
  26   HostState H;
  27   H.CpuFrequency = CpuInfo.cycles_per_second;
  28   H.CpuName = llvm::sys::getHostCPUName().str();
  29   for (const auto &BenchmarkCacheInfo : CpuInfo.caches) {
  30     CacheInfo CI;
  31     CI.Type = BenchmarkCacheInfo.type;
  32     CI.Level = BenchmarkCacheInfo.level;
  33     CI.Size = BenchmarkCacheInfo.size;
  34     CI.NumSharing = BenchmarkCacheInfo.num_sharing;
  35     H.Caches.push_back(std::move(CI));
  36   }
  37   return H;
  38 }
  39
  40 } // namespace libc_benchmarks
  41 } // namespace llvm