example:
./dasm opcode.o opcode.op_eq_s
Disassembly of section .text._D6opcode7op_eq_sFZi:
0000000000000000 <_D6opcode7op_eq_sFZi>:
0: 55 push %rbp
1: 48 8b ec mov %rsp,%rbp
4: 48 39 d1 cmp %rdx,%rcx
7: 75 0a jne 13
<_D6opcode7op_eq_sFZi+0x13>
9: 48 85 c9 test %rcx,%rcx
c: 74 0c je 1a
<_D6opcode7op_eq_sFZi+0x1a>
e: fc cld
f: f3 a6 repz cmpsb %es:(%rdi),%ds:(%rsi)
11: 74 07 je 1a
<_D6opcode7op_eq_sFZi+0x1a>
13: b8 00 00 00 00 mov $0x0,%eax
18: eb 05 jmp 1f
<_D6opcode7op_eq_sFZi+0x1f>
1a: b8 01 00 00 00 mov $0x1,%eax
1f: 90 nop
20: 5d pop %rbp
21: c3 retq
...
