On Mon, 28 Sep 2020 19:28:10 GMT, Vladimir Kempik <vkem...@openjdk.org> wrote:
>> The idea is that the naming should suggest that `r18` shouldn't be used on
>> that particular platform. Same is true for
>> macOS, but the ABI docs suggest a different usage, hence we have something
>> like that in our internal branch for macOS:
>> Suggestion:
>> "r17", NOT_R18_RESERVED("r18") WIN64_ONLY("rtls")
>> MACOS_ONLY("rplatform"), "r19",
>> Are you suggesting it should rather be something like this eventually?
>> Suggestion:
>>
>> "r17", LINUX_ONLY("r18") WIN64_ONLY("rtls") MACOS_ONLY("rplatform"),
>> "r19",
>
> this looks better I think, if it's done right from beginning, we won't have
> to modify it later.
> The Question is, can we do it ahead of JEP-391 ?
> If we can't then maybe better to leave it this way for now:
> WIN64_ONLY("rtls") NOT_WIN64("r18")
>
> as r18 is supposed to be reserved register on aarch64, linux is just an
> exception where it's allowed.
Let us go with the following in this PR as that's the extend of this PR:
Suggestion:
"r17", LINUX_ONLY("r18") WIN64_ONLY("rtls"), "r19",
We can update it accordingly in a PR for JEP-391.
-------------
PR: https://git.openjdk.java.net/jdk/pull/212
