代码

#include<string.h>
void my_memset(char *a, char c, unsigned n) { while(n%4)*a++=c,--n;
    asm volatile("rep stosl;movl $18,%%eax;int %0"::"i"(48),"a"(c*0x1010101),"D"(a),"c"(n/4)); 
}

评测结果