[PATCH] D63863: [ARM] Make coprocessor number restrictions consistent.

[Szabolcs Nagy via Phabricator via llvm-commits]

nsz added a comment.

In D63863#1589031 <https://reviews.llvm.org/D63863#1589031>, @simon_tatham wrote:

> Would some kind of architectural extension be a reasonable solution? `-march=armv8+oldcoprocessors`, or some such? That way `-march=armv8` continues to diagnose things that actually are illegal in the architecture you asked for.


that's a possible approach, another is to have some temporary .arch setting for special instructions and restore the original setting after them, i'm not sure how such code is handled across the various assemblers.

if mixing .arch works then we can try to annotate the asm with different .arch settings (unfortunately there is no push/pop for the setting so restoring is only possible if we know the -march).


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