gcc -O0 -c -mabm -mbmi retard.c -o retard.o
^
|
|
|
int code(unsigned long long number) {
return (int) _tzcnt_u64(number);
}
objdump --disassemble-all retard.o
0000000000000000 <code>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 48 83 ec 10 sub $0x10,%rsp
8: 48 89 4d 10 mov %rcx,0x10(%rbp)
c: 48 8b 45 10 mov 0x10(%rbp),%rax
10: 48 89 45 f8 mov %rax,-0x8(%rbp)
14: 31 c0 xor %eax,%eax
16: f3 48 0f bc 45 f8 tzcnt -0x8(%rbp),%rax
<---------------------
1c: 48 83 c4 10 add $0x10,%rsp
20: 5d pop %rbp
Moron.
