Re: [avr-llvm-devel] Regression tests

[John M. <ato...@gm...>]

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