147 lines
4.7 KiB
C++
147 lines
4.7 KiB
C++
/// \author Леонид Юрьев aka Leonid Yuriev <leo@yuriev.ru> \date 2015-2024
|
|
/// \copyright SPDX-License-Identifier: Apache-2.0
|
|
|
|
#include "test.h++"
|
|
|
|
namespace chrono {
|
|
|
|
#ifndef NSEC_PER_SEC
|
|
#define NSEC_PER_SEC 1000000000u
|
|
#endif /* NSEC_PER_SEC */
|
|
|
|
uint32_t ns2fractional(uint32_t ns) {
|
|
assert(ns < NSEC_PER_SEC);
|
|
/* LY: здесь и далее используется "длинное деление", которое
|
|
* для ясности кода оставлено как есть (без ручной оптимизации). Так как
|
|
* GCC, Clang и даже MSVC сами давно умеют конвертировать деление на
|
|
* константу в быструю reciprocal-форму. */
|
|
return uint32_t((uint64_t(ns) << 32) / NSEC_PER_SEC);
|
|
}
|
|
|
|
uint32_t fractional2ns(uint32_t fractional) {
|
|
return uint32_t((fractional * uint64_t(NSEC_PER_SEC)) >> 32);
|
|
}
|
|
|
|
#ifndef USEC_PER_SEC
|
|
#define USEC_PER_SEC 1000000u
|
|
#endif /* USEC_PER_SEC */
|
|
uint32_t us2fractional(uint32_t us) {
|
|
assert(us < USEC_PER_SEC);
|
|
return uint32_t((uint64_t(us) << 32) / USEC_PER_SEC);
|
|
}
|
|
|
|
uint32_t fractional2us(uint32_t fractional) {
|
|
#if !(defined(_M_ARM) || defined(_M_ARM64) || defined(_M_HYBRID_X86_ARM64))
|
|
/* Смеяться или плакать, но все существующие на май 2024 компиляторы Microsoft
|
|
* для ARM/ARM64, уже порядка 10 лет, падают на этом коде из-за внтутренней
|
|
* ошибке (aka ICE). */
|
|
return uint32_t((fractional * uint64_t(USEC_PER_SEC)) >> 32);
|
|
#else
|
|
static_assert(USEC_PER_SEC % 16 == 0, "WTF?");
|
|
/* Crutch for MSVC ARM/ARM64 compilers to avoid internal compiler error. */
|
|
return UInt32x32To64(fractional, USEC_PER_SEC / 16) >> 28;
|
|
#endif
|
|
}
|
|
|
|
#ifndef MSEC_PER_SEC
|
|
#define MSEC_PER_SEC 1000u
|
|
#endif /* MSEC_PER_SEC */
|
|
uint32_t ms2fractional(uint32_t ms) {
|
|
assert(ms < MSEC_PER_SEC);
|
|
return uint32_t((uint64_t(ms) << 32) / MSEC_PER_SEC);
|
|
}
|
|
|
|
uint32_t fractional2ms(uint32_t fractional) {
|
|
return uint32_t((fractional * uint64_t(MSEC_PER_SEC)) >> 32);
|
|
}
|
|
|
|
time from_ns(uint64_t ns) {
|
|
time result;
|
|
result.fixedpoint =
|
|
((ns / NSEC_PER_SEC) << 32) | ns2fractional(uint32_t(ns % NSEC_PER_SEC));
|
|
return result;
|
|
}
|
|
|
|
time from_us(uint64_t us) {
|
|
time result;
|
|
result.fixedpoint =
|
|
((us / USEC_PER_SEC) << 32) | us2fractional(uint32_t(us % USEC_PER_SEC));
|
|
return result;
|
|
}
|
|
|
|
time from_ms(uint64_t ms) {
|
|
time result;
|
|
result.fixedpoint =
|
|
((ms / MSEC_PER_SEC) << 32) | ms2fractional(uint32_t(ms % MSEC_PER_SEC));
|
|
return result;
|
|
}
|
|
|
|
#if __GNUC_PREREQ(8, 0) && \
|
|
(defined(__MINGW__) || defined(__MINGW32__) || defined(__MINGW64__))
|
|
#pragma GCC diagnostic push
|
|
#pragma GCC diagnostic ignored "-Wcast-function-type"
|
|
#endif /* GCC/MINGW */
|
|
|
|
time now_realtime() {
|
|
#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
|
|
static void(WINAPI * query_time)(LPFILETIME);
|
|
if (unlikely(!query_time)) {
|
|
HMODULE hModule = GetModuleHandle(TEXT("kernel32.dll"));
|
|
if (hModule)
|
|
query_time = (void(WINAPI *)(LPFILETIME))GetProcAddress(
|
|
hModule, "GetSystemTimePreciseAsFileTime");
|
|
if (!query_time)
|
|
query_time = GetSystemTimeAsFileTime;
|
|
}
|
|
|
|
FILETIME filetime;
|
|
query_time(&filetime);
|
|
uint64_t ns100 =
|
|
(uint64_t)filetime.dwHighDateTime << 32 | filetime.dwLowDateTime;
|
|
return from_ns((ns100 - UINT64_C(116444736000000000)) * 100u);
|
|
#else
|
|
struct timespec ts;
|
|
if (unlikely(clock_gettime(CLOCK_REALTIME, &ts)))
|
|
failure_perror("clock_gettime(CLOCK_REALTIME", errno);
|
|
|
|
return from_timespec(ts);
|
|
#endif
|
|
}
|
|
|
|
time now_monotonic() {
|
|
#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
|
|
static uint64_t reciprocal;
|
|
static LARGE_INTEGER Frequency;
|
|
if (reciprocal == 0) {
|
|
if (!QueryPerformanceFrequency(&Frequency))
|
|
failure_perror("QueryPerformanceFrequency()", GetLastError());
|
|
reciprocal = (((UINT64_C(1) << 48) + Frequency.QuadPart / 2 + 1) /
|
|
Frequency.QuadPart);
|
|
assert(reciprocal);
|
|
}
|
|
|
|
LARGE_INTEGER Counter;
|
|
if (!QueryPerformanceCounter(&Counter))
|
|
failure_perror("QueryPerformanceCounter()", GetLastError());
|
|
|
|
time result;
|
|
result.fixedpoint = (Counter.QuadPart / Frequency.QuadPart) << 32;
|
|
uint64_t mod = Counter.QuadPart % Frequency.QuadPart;
|
|
result.fixedpoint += (mod * reciprocal) >> 16;
|
|
return result;
|
|
#else
|
|
struct timespec ts;
|
|
if (unlikely(clock_gettime(CLOCK_MONOTONIC, &ts)))
|
|
failure_perror("clock_gettime(CLOCK_MONOTONIC)", errno);
|
|
|
|
return from_timespec(ts);
|
|
#endif
|
|
}
|
|
|
|
#if __GNUC_PREREQ(8, 0) && \
|
|
(defined(__MINGW__) || defined(__MINGW32__) || defined(__MINGW64__))
|
|
#pragma GCC diagnostic pop
|
|
#endif /* GCC/MINGW */
|
|
|
|
} /* namespace chrono */
|