xref: /aosp_15_r20/external/llvm-libc/test/src/math/performance_testing/Timer.cpp (revision 71db0c75aadcf003ffe3238005f61d7618a3fead) 
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 #include "src/__support/macros/config.h"
11 
12 #include <chrono>
13 #include <fstream>
14 
15 namespace LIBC_NAMESPACE_DECL {
16 namespace testing {
17 
18 struct TimerImplementation {
19   std::chrono::high_resolution_clock::time_point Start;
20   std::chrono::high_resolution_clock::time_point End;
21 };
22 
Timer()23 Timer::Timer() : Impl(new TimerImplementation) {}
24 
~Timer()25 Timer::~Timer() { delete reinterpret_cast<TimerImplementation *>(Impl); }
26 
start()27 void Timer::start() {
28   auto T = reinterpret_cast<TimerImplementation *>(Impl);
29   T->Start = std::chrono::high_resolution_clock::now();
30 }
31 
stop()32 void Timer::stop() {
33   auto T = reinterpret_cast<TimerImplementation *>(Impl);
34   T->End = std::chrono::high_resolution_clock::now();
35 }
36 
nanoseconds() const37 uint64_t Timer::nanoseconds() const {
38   auto T = reinterpret_cast<TimerImplementation *>(Impl);
39   return std::chrono::nanoseconds(T->End - T->Start).count();
40 }
41 
42 } // namespace testing
43 } // namespace LIBC_NAMESPACE_DECL
44