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Re: gcc -S vs clang -S


I think Thiago and Eric just want to know which code-gen is better and why...

2015-05-12 23:29 GMT+08:00 Eric Botcazou <ebotcazou@libertysurf.fr>:
>> Note that at -O3 there is a difference still:
>> clang (3.6.0):
>>         addl    %esi, %edi
>>         movl    %edi, %eax
>>         retq
>>
>> gcc (4.9.2)
>>         leal    (%rdi,%rsi), %eax
>>         ret
>>
>> Can't tell which is best, if any.
>
> But what's your point exactly here?  You cannot expect different compilers to
> generate exactly the same code on a given testcase for non-toy architectures.
>
> Note that this kind of discussion is more appropriate for gcc-help@gcc.gnu.org
>
> --
> Eric Botcazou


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