[llvm-dev] target ABI: call parameters handling

[Jonas Paulsson via llvm-dev]

Sorry for the delay on this... Please find my initial patch proposal at 
https://reviews.llvm.org/D112942.

/Jonas


On 2021-10-07 19:39, Ulrich Weigand wrote:
>
> "Reid Kleckner" <rnk at google.com> wrote on 06.10.2021 19:00:44:
> > On Wed, Oct 6, 2021 at 9:15 AM Ulrich Weigand 
> <Ulrich.Weigand at de.ibm.com> wrote:
> >> As I commented in another mail, unfortunately this is not true.
> >> To ensure correct codegen in all cases, we need to know *which*
> >> extension the callee expects: zero- or sign-extension.  The
> >> backend cannot know this without being told by the frontend.
>
> > Maybe this is just a wording thing, but I do believe my statement is
> > true: the backend is absolutely free to guess if it wants to, and
> > requiring attributes doesn't guarantee correctness. It may just move
> > the bug to the frontend. I acknowledge that there are risks to
> > guessing. I just think it is important to consider alternative
> > designs and weigh the pros and cons.
>
> I guess it's indeed just wording, and we agree on the substance.
>
> Thanks,
> Ulrich
>
>
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