// Copyright 2016 The SwiftShader 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.

#include "Timer.hpp"

#if !defined(__i386__) && defined(_M_IX86)
	#define __i386__ 1
#endif

#if !defined(__x86_64__) && (defined(_M_AMD64) || defined (_M_X64))
	#define __x86_64__ 1
#endif

#if defined(_WIN32)
	#ifndef WIN32_LEAN_AND_MEAN
		#define WIN32_LEAN_AND_MEAN
	#endif
	#include <windows.h>
	#include <intrin.h>
#else
	#include <sys/time.h>
	#if defined(__i386__) || defined(__x86_64__)
		#include <x86intrin.h>
	#endif
#endif

namespace sw {

Timer::Timer()
{
}

Timer::~Timer()
{
}

double Timer::seconds()
{
	#if defined(_WIN32)
		return (double)counter() / (double)frequency();
	#else
		timeval t;
		gettimeofday(&t, 0);
		return (double)t.tv_sec + (double)t.tv_usec * 1.0e-6;
	#endif
}

int64_t Timer::ticks()
{
	#if defined(_WIN32)
		#if defined(_M_ARM64)
			return _ReadStatusReg(ARM64_PMCCNTR_EL0);
		#else
			return __rdtsc();
		#endif
	#elif defined(__i386__) || defined(__x86_64__)
		int64_t tsc;
		__asm volatile("rdtsc": "=A" (tsc));
		return tsc;
	#else
		return 0;
	#endif
}

int64_t Timer::counter()
{
	#if defined(_WIN32)
		int64_t counter;
		QueryPerformanceCounter((LARGE_INTEGER*)&counter);
		return counter;
	#else
		timeval t;
		gettimeofday(&t, 0);
		return t.tv_sec * 1000000 + t.tv_usec;
	#endif
}

int64_t Timer::frequency()
{
	#if defined(_WIN32)
		int64_t frequency;
		QueryPerformanceFrequency((LARGE_INTEGER*)&frequency);
		return frequency;
	#else
		return 1000000;   // gettimeofday uses microsecond resolution
	#endif
}

}  // namespace sw