[PATCH] D145131: [Arm][AArch64] Setting IsX18ReservedByDefault() to true for Unknown OSes

[Murali Vijayaraghavan via Phabricator via llvm-commits]

vmurali added a comment.



> As @DavidSpickett mentioned above, there are existing command line options that allow the user to opt-in to this behaviour, as recommended by the AAPCS64 document when creating platform-independent code:
>
>> Software developers creating platform-independent code are advised to avoid using r18 if at all possible.

Doesn't this imply x18 should be reserved by default unless they change the default to use it?


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https://reviews.llvm.org/D145131