[PATCH] D78372: [AArch64] Allow PAC mnemonics in the HINT space with PAC disabled

[Pablo Barrio via Phabricator via llvm-commits]

pbarrio created this revision.
pbarrio added reviewers: danielkiss, chill, olista01, LukeCheeseman, simon_tatham.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: LLVM.

It is important to emit HINT instructions instead of PAC ones when
PAC is disabled. This allows compatibility with other assemblers
(e.g. GAS). This was implemented in commit da33762de853 <https://reviews.llvm.org/rGda33762de8531914d4d0dae16bfce2192f02bc79>.

Still, developers of assembly code will want to write code that is
compatible with both pre- and post-PAC CPUs. They could use HINT
mnemonics, but the new mnemonics are a lot more readable (e.g.
paciaz instead of hint #24), and they will result in the same
encodings. So, while LLVM should not *emit* the new mnemonics when
PAC is disabled, this patch will at least make LLVM *accept*
assembly code that uses them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D78372

Files:
  llvm/lib/Target/AArch64/AArch64InstrInfo.td
  llvm/test/MC/AArch64/armv8.3a-signed-pointer.s

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