tensorflow/lite/micro/micro_time.cc

/* Copyright 2020 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

// Reference implementation of timer functions.  Platforms are not required to
// implement these timer methods, but they are required to enable profiling.

// On platforms that have a POSIX stack or C library, it can be written using
// methods from <sys/time.h> or clock() from <time.h>.

// To add an equivalent function for your own platform, create your own
// implementation file, and place it in a subfolder with named after the OS
// you're targeting. For example, see the Cortex M bare metal version in
// tensorflow/lite/micro/bluepill/micro_time.cc

#include "tensorflow/lite/micro/micro_time.h"

#include "benchmarks/cycle_count.h"

#if defined(TF_LITE_USE_CTIME)
#include <ctime>
#endif

namespace tflite {

#if !defined(TF_LITE_USE_CTIME)

// Currently disable ticks_per_second as it won't work for simulator targets.
uint32_t ticks_per_second() { return 0; }

uint32_t GetCurrentTimeTicks() { return static_cast<uint32_t>(mcycle_read()); }

#else  // defined(TF_LITE_USE_CTIME)

// For platforms that support ctime, we implment the micro_time interface in
// this central location.
uint32_t ticks_per_second() { return CLOCKS_PER_SEC; }

uint32_t GetCurrentTimeTicks() { return clock(); }
#endif

}  // namespace tflite