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Re: naked function attribute support for Mips


On Thu, May 2, 2013 at 3:35 PM, reed kotler <rkotler@mips.com> wrote:
> This issue of naked function attribute support for Mips has come up in the
> context of LLVM and in regards to maintaining compatibility with gcc.
>
> It's my understanding that the idea of the naked function attribute was
> rejected for gcc Mips.
>
> I'm curious as to why.
>
> For LLVM it basically works just by nature of how LLVM works in its target
> independent part.
>
> It will not emit the function prologue or epilogue.
>
> It still emits the .frame, .mask and .fmask because that is Mips specific
> code that does not currently know about the naked function attribute, but
> that is a separate issue.
>
> There is also the issue of the return statement but this also a separate non
> Mips specific issue and I will post that separately.

What are the use cases of naked for mips that the interrupt attribute
does not handle?  Including the use_shadow_register_set,
keep_interrupts_masked and use_debug_exception_return attributes which
MIPS backend already handles.

Thanks,
Andrew Pinski


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