[LINUX] Time measurement using a clock

I made a library of time measurement using a clock.

Supported

C language standard

C11

compiler

Clang
GCC

OS

Linux
macOS

I don't know the rest

logic

Use __builtin_readcyclecounter () for Clang
Use __rdtsc () with GCC and x86 architecture
For GCC and Linux, use timespec_get ()

I don't know the rest

Source code

`clockcycle.h`


#ifndef CLOCKCYCLE_H
#define CLOCKCYCLE_H

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#ifdef __clang__
static inline uint64_t now() {
	return __builtin_readcyclecounter();
}
#elif defined(__GNUC__)
#if defined(__i386__) || defined(__x86_64__) || defined(__amd64__)
#include <x86intrin.h>
static inline uint64_t now() {
	return __rdtsc();
}
#elif defined(__linux__)
#include <time.h>
static inline uint64_t now() {
	struct timespec ts = {0, 0};
	timespec_get(&ts, TIME_UTC);
	return (uint64_t)(ts.tv_sec) * 1000000000 + ts.tv_nsec;
}
#else
#error unsupported architecture
#endif
#endif

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // CLOCKCYCLE_H

in conclusion

Actually, I would like to rewrite the code of the instruction to read the clock for ARM as well, referring to the following.

https://stackoverflow.com/questions/40454157/is-there-an-equivalent-instruction-to-rdtsc-in-arm/40455065

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