fib(n)

fib.s

0000000000400ef0 <_Z3fibi>:

long long fib(int n) {
  400ef0: b8 01 00 00 00        mov    $0x1,%eax
  if (n <= 1)
  400ef5: 83 ff 02              cmp    $0x2,%edi
  400ef8: 0f 8c 8f 00 00 00     jl     400f8d <_Z3fibi+0x9d>

  long long a = 1;
  long long b = 1;
  long long c;
  for (int i = 2; i <= n; i++) {
    c = a + b;
  400efe: 44 8d 4f 07           lea    0x7(%rdi),%r9d
  400f02: 44 8d 47 fe           lea    -0x2(%rdi),%r8d
  400f06: b8 01 00 00 00        mov    $0x1,%eax
  400f0b: 41 f6 c1 07           test   $0x7,%r9b
  400f0f: 74 3d                 je     400f4e <_Z3fibi+0x5e>
  400f11: 41 83 e1 07           and    $0x7,%r9d
  400f15: 31 d2                 xor    %edx,%edx
  400f17: b8 01 00 00 00        mov    $0x1,%eax
  400f1c: b9 01 00 00 00        mov    $0x1,%ecx
  400f21: 66 66 66 66 66 66 2e  data16 data16 data16 data16 data16 nopw %cs:0x0(%rax,%rax,1)
  400f28: 0f 1f 84 00 00 00 00
  400f2f: 00
  400f30: 48 89 ce              mov    %rcx,%rsi
  400f33: 48 89 c1              mov    %rax,%rcx
  400f36: 41 89 d2              mov    %edx,%r10d
  400f39: 48 89 f0              mov    %rsi,%rax
  400f3c: 48 01 c8              add    %rcx,%rax
    return 1;

  long long a = 1;
  long long b = 1;
  long long c;
  for (int i = 2; i <= n; i++) {
  400f3f: 41 8d 52 01           lea    0x1(%r10),%edx
  400f43: 41 39 d1              cmp    %edx,%r9d
  400f46: 75 e8                 jne    400f30 <_Z3fibi+0x40>
  400f48: 41 83 c2 03           add    $0x3,%r10d
  400f4c: eb 0b                 jmp    400f59 <_Z3fibi+0x69>
  400f4e: 41 ba 02 00 00 00     mov    $0x2,%r10d
  400f54: b9 01 00 00 00        mov    $0x1,%ecx
    c = a + b;
  400f59: 41 83 f8 07           cmp    $0x7,%r8d
  400f5d: 72 2e                 jb     400f8d <_Z3fibi+0x9d>
  400f5f: ff c7                 inc    %edi
  400f61: 44 29 d7              sub    %r10d,%edi
  400f64: 66 66 66 2e 0f 1f 84  data16 data16 nopw %cs:0x0(%rax,%rax,1)
  400f6b: 00 00 00 00 00
  400f70: 48 01 c1              add    %rax,%rcx
  400f73: 48 01 c8              add    %rcx,%rax
  400f76: 48 01 c1              add    %rax,%rcx
  400f79: 48 01 c8              add    %rcx,%rax
  400f7c: 48 01 c1              add    %rax,%rcx
  400f7f: 48 01 c8              add    %rcx,%rax
  400f82: 48 01 c1              add    %rax,%rcx
  400f85: 48 01 c8              add    %rcx,%rax
    return 1;
      long long a = 1;
  long long b = 1;
  long long c;
  for (int i = 2; i <= n; i++) {
  400f88: 83 c7 f8              add    $0xfffffff8,%edi
  400f8b: 75 e3                 jne    400f70 <_Z3fibi+0x80>
    c = a + b;
    a = b;
    b = c;
  }
  return c;
}
  400f8d: c3                    retq
  400f8e: 66 90                 xchg   %ax,%ax