libc/test/src/math/differential_testing/Timer.cpp

   1 //===-- Timer.cpp --------------------------------------------------------===//
   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 "Timer.h"
  10
  11 #include <chrono>
  12 #include <fstream>
  13
  14 namespace LIBC_NAMESPACE {
  15 namespace testing {
  16
  17 struct TimerImplementation {
  18   std::chrono::high_resolution_clock::time_point Start;
  19   std::chrono::high_resolution_clock::time_point End;
  20 };
  21
  22 Timer::Timer() : Impl(new TimerImplementation) {}
  23
  24 Timer::~Timer() { delete reinterpret_cast<TimerImplementation *>(Impl); }
  25
  26 void Timer::start() {
  27   auto T = reinterpret_cast<TimerImplementation *>(Impl);
  28   T->Start = std::chrono::high_resolution_clock::now();
  29 }
  30
  31 void Timer::stop() {
  32   auto T = reinterpret_cast<TimerImplementation *>(Impl);
  33   T->End = std::chrono::high_resolution_clock::now();
  34 }
  35
  36 uint64_t Timer::nanoseconds() const {
  37   auto T = reinterpret_cast<TimerImplementation *>(Impl);
  38   return std::chrono::nanoseconds(T->End - T->Start).count();
  39 }
  40
  41 } // namespace testing
  42 } // namespace LIBC_NAMESPACE