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

#ifdef ARCH_X86_64

#define MEMSET_FN(fn, name, desc)		\
	extern void *fn(void *, int, size_t);

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

#undef MEMSET_FN

#endif