1. 根目录:
2. tools
3. perf
4. bench
5. mem-memcpy-arch.h

#ifdef ARCH_X86_64

#define MEMCPY_FN(fn, name, desc)		\
	extern void *fn(void *, const void *, size_t);

#include "mem-memcpy-x86-64-asm-def.h"

#undef MEMCPY_FN

#endif