[PATCH] Implement ARM EHABI

[Ilyong Cho]

Or we can just ignore such cases.
Becasue it's very very weird and at least there is a another option to
conpile it :)

Regards
Ilyong Cho
2013. 4. 15. 오후 6:26에 "Ilyong Cho" <ilyoan at gmail.com>님이 작성:

> Ooops I've accidently pushed send button :)
>
> Anyway, IMO, There is no problem the patch from Logan regarding to the
> issue I mentioned, because there is no way to produce the case right now.
> But after llvm-mc understand unwind directive, it can be the case.
>
> Regards,
> Ilyong Cho
> 2013. 4. 15. 오후 6:12에 "Ilyong Cho" <ilyoan at gmail.com>님이 작성:
>
>> Hi Anton
>>
>> Actually I'm not sure if it is possible to make such test cases using
>> higher language. And llvm-mc looks like does not understand unwind
>> directives(am I right?) so it is impossible to make test case using llvm-mc.
>>
>> The counter example is a wired situation that pushes the same register
>> into stack twice from function prologue(I just analyzed reviewing source
>> code, so I can be wrong). There are some such handmade assemblies In my
>> personal project for some reasons(ex. stack manipulation)
>> And I'm pretty sure that higher language compilers never generate such
>> assembly.
>>  2013. 4. 15. 오후 5:28에 "Anton Korobeynikov" <anton at korobeynikov.info>님이
>> 작성:
>>
>>> Hello,
>>>
>>> > I've juat looked the patch and I think it looks good but I found the
>>> > implementation of that patch is different from gas's. I have a weird
>>> use
>>> > case (hand made ARM assembly with a complex function prologue) that the
>>> > patch on D414 couldn't cover but gas implementation(and mine) could
>>> cover.
>>> Will it be possible for you to provide a testcase then? Knowing that
>>> the code is broken is not a good thing for committing it :)
>>>
>>> --
>>> With best regards, Anton Korobeynikov
>>> Faculty of Mathematics and Mechanics, Saint Petersburg State University
>>>
>>
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