[cfe-dev] assembly output

[Thiago Farina]

On Tue, Sep 3, 2013 at 8:19 AM, Thiago Farina <tfransosi at gmail.com> wrote:
> On Sun, Sep 1, 2013 at 12:15 PM, Reid Kleckner <rnk at google.com> wrote:
>> What's unreadable about empty.s that's better with objdump?  It seems fine.
>> Is it the .cfi directives?
>>
> Yeah, I think it's that.
>
> Compare this (objdump --dissamble disa):
>
--disassemble

> 0000000000400510 <_Z3sumv>:
>   400510: 55                   push   %rbp
>   400511: 48 89 e5          mov    %rsp,%rbp
>   400514: b8 03 00 00 00 mov    $0x3,%eax
>   400519: 5d                   pop    %rbp
>   40051a: c3                   retq
>   40051b: 0f 1f 44 00 00  nopl   0x0(%rax,%rax,1)
>
> To (clang++ -S disa.cc):
>
> _Z3sumv:                               # @_Z3sumv
>              .cfi_startproc
> # BB#0:                                 # %entry
>             pushq   %rbp
>
> --
> Thiago Farina