(gdb) disassemble $pc-32,$pc+32
Dump of assembler code from 0x7ffff68c5d5a to 0x7ffff68c5d9a:
   0x00007ffff68c5d5a:  add    %al,(%rax)
   0x00007ffff68c5d5c:  add    %al,(%rax)
   0x00007ffff68c5d5e:  add    %al,(%rax)
   0x00007ffff68c5d60:  mov    %esi,%ecx
   0x00007ffff68c5d62:  mov    %edi,%eax
   0x00007ffff68c5d64:  and    $0x3f,%rcx
   0x00007ffff68c5d68:  and    $0x3f,%rax
   0x00007ffff68c5d6c:  cmp    $0x30,%ecx
   0x00007ffff68c5d6f:  ja     0x7ffff68c5db0
   0x00007ffff68c5d71:  cmp    $0x30,%eax
   0x00007ffff68c5d74:  ja     0x7ffff68c5db0
   0x00007ffff68c5d76:  movdqu (%rdi),%xmm1
=> 0x00007ffff68c5d7a:  movdqu (%rsi),%xmm2
   0x00007ffff68c5d7e:  pxor   %xmm0,%xmm0
   0x00007ffff68c5d82:  pcmpeqb %xmm1,%xmm0
   0x00007ffff68c5d86:  pcmpeqb %xmm2,%xmm1
   0x00007ffff68c5d8a:  psubb  %xmm0,%xmm1
   0x00007ffff68c5d8e:  pmovmskb %xmm1,%edx
   0x00007ffff68c5d92:  sub    $0xffff,%edx
   0x00007ffff68c5d98:  jne    0x7ffff68c6bd0
End of assembler dump.