(gdb) disas
Dump of assembler code for function phase_5:
=> 0x000000000040108a <+0>:	push   %rbx
   0x000000000040108b <+1>:	sub    $0x10,%rsp
   0x000000000040108f <+5>:	mov    %rdi,%rbx
   0x0000000000401092 <+8>:	callq  0x4012eb <string_length>
   0x0000000000401097 <+13>:	cmp    $0x6,%eax
   0x000000000040109a <+16>:	jne    0x4010db <phase_5+81>
   0x000000000040109c <+18>:	mov    $0x0,%eax
   0x00000000004010a1 <+23>:	movzbl (%rbx,%rax,1),%edx
   0x00000000004010a5 <+27>:	and    $0xf,%edx
   0x00000000004010a8 <+30>:	movzbl 0x402540(%rdx),%edx
   0x00000000004010af <+37>:	mov    %dl,0x9(%rsp,%rax,1)
   0x00000000004010b3 <+41>:	add    $0x1,%rax
   0x00000000004010b7 <+45>:	cmp    $0x6,%rax
   0x00000000004010bb <+49>:	jne    0x4010a1 <phase_5+23>
   0x00000000004010bd <+51>:	movb   $0x0,0xf(%rsp)
   0x00000000004010c2 <+56>:	mov    $0x4024f7,%esi
   0x00000000004010c7 <+61>:	lea    0x9(%rsp),%rdi
   0x00000000004010cc <+66>:	callq  0x401308 <strings_not_equal>
   0x00000000004010d1 <+71>:	test   %eax,%eax
   0x00000000004010d3 <+73>:	jne    0x4010e2 <phase_5+88>
   0x00000000004010d5 <+75>:	add    $0x10,%rsp
   0x00000000004010d9 <+79>:	pop    %rbx
   0x00000000004010da <+80>:	retq
   0x00000000004010db <+81>:	callq  0x40156d <explode_bomb>
   0x00000000004010e0 <+86>:	jmp    0x40109c <phase_5+18>
   0x00000000004010e2 <+88>:	callq  0x40156d <explode_bomb>
   0x00000000004010e7 <+93>:	jmp    0x4010d5 <phase_5+75>

Dump of assembler code for function string_length:
=> 0x00000000004012eb <+0>:	cmpb   $0x0,(%rdi)
   0x00000000004012ee <+3>:	je     0x401302 <string_length+23>
   0x00000000004012f0 <+5>:	mov    %rdi,%rdx
   0x00000000004012f3 <+8>:	add    $0x1,%rdx
   0x00000000004012f7 <+12>:	mov    %edx,%eax
   0x00000000004012f9 <+14>:	sub    %edi,%eax
   0x00000000004012fb <+16>:	cmpb   $0x0,(%rdx)
   0x00000000004012fe <+19>:	jne    0x4012f3 <string_length+8>
   0x0000000000401300 <+21>:	repz retq
   0x0000000000401302 <+23>:	mov    $0x0,%eax
   0x0000000000401307 <+28>:	retq