[PATCH] D76848: [CodeGen] Error when writing to reserved registers in inline asm

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Forbidding sp references would probably going to break real code for no reason; probably not a good idea.

Probably we want to try to follow gcc for whatever other obscure edge cases exist.  Off the top of my head, the only other one on ARM is "fixed" registers. For example, with -ffixed-r4, gcc allows referencing r4.

What does that mean in terms of whitelisting/blacklisting?  Probably makes sense to blacklist, if we're just talking about forbidding pc, the frame pointer, and the base pointer.


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https://reviews.llvm.org/D76848