1 // gcc -shared -gctf -gdwarf-3 -mtune=generic -march=x86-64 -std=c99 -fPIC -o test4.so test4.c 2 3 char * cpy(char * restrict s1,const char * restrict s2,unsigned int n)4cpy (char * restrict s1, const char * restrict s2, unsigned int n) 5 { 6 char *t1 = s1; 7 const char *t2 = s2; 8 while(n-- > 0) 9 *t1++ = *t2++; 10 return s1; 11 } 12