timer.h

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#pragma once
 
#include <arch/platform.h>
 
#include <stdint.h>
#include <time.h>
 
typedef uint_fast64_t timer_uint;
 
static inline timer_uint timer_new(void);
 
static inline timer_uint timer_value(timer_uint start);
 
#ifdef __POSIX
#include <sys/time.h>
 
static inline timer_uint timer_new(void)
{
    struct timeval tmptv;
    gettimeofday(&tmptv, NULL);
    return (timer_uint)tmptv.tv_sec * 1000000U + tmptv.tv_usec;
}
 
static inline timer_uint timer_value(timer_uint start)
{
    return timer_new() - start;
}
 
#endif
 
#ifdef __WINDOWS
#include <windows.h>
 
static timer_uint timer_perf_freq = 0;
 
static inline timer_uint timer_new(void)
{
    LARGE_INTEGER start_time;
    QueryPerformanceCounter(&start_time);
    return (timer_uint)start_time.QuadPart;
}
 
 
static inline timer_uint timer_value(timer_uint start)
{
    if(unlikely(timer_perf_freq == 0)) {
        LARGE_INTEGER perf;
        QueryPerformanceFrequency(&perf);
        timer_perf_freq = perf.QuadPart;
    }
    return (timer_new() - start) * 1000000U / timer_perf_freq;
}
 
#endif
 
#if defined(__x86_64__) || defined(__i386__)
#ifdef __WINDOWS
#include <intrin.h>
#else
#include <x86intrin.h>
#endif
 
static inline timer_uint timer_hr_new(void)
{
    return __rdtsc();
}
 
#else
 
static inline timer_uint timer_hr_new(void)
{
    return timer_new();
}
 
#endif
 
static inline timer_uint timer_hr_value(timer_uint start)
{
    return timer_hr_new() - start;
}