Re: [avr-llvm-devel] Regression tests

[Nicklas Bo J. <nbj...@gm...>]

Thanks for the link, very nice overview.

Are the following tests obsolete?

   - Returning void?
   - Returning the first parameter, which is already in the correct place?

Do we need additional tests for returning, besides returning immediate and
argument, like returning a value from register or is it already covered in
returning a argument?

On Tue, May 22, 2012 at 9:01 PM, John Myers <ato...@gm...> wrote:

>
>
> On Tue, May 22, 2012 at 11:34 AM, Nicklas Bo Jensen <nbj...@gm...>wrote:
>
>> Perfect :)
>>
>> I'm moving on to calling convention and have started with return values.
>> However I'm a bit unsure what the calling convention actually is. For
>> example with my last test, called "return64_arg2" in the attached .ll file
>> and the generated assembly in the .s file, is the correct thing happening
>> and how it should be tested? Couldn't we have passed the arguments in the
>> normal registers? I.e. r25:r2.
>>
>> If the arguments don't fit in the registers, do we always store the
>> result in the same place in ram?
>>
>
> It should be placed on the stack so the exact place in ram will vary.
>
> Calling Convention / ABI:
> http://www.nongnu.org/avr-libc/user-manual/FAQ.html#faq_reg_usage
>