[PATCH] D140216: [AArch64] Add missing v8.8a Non-maskable Interrupts feature

[Lucas Prates via Phabricator via llvm-commits]

pratlucas created this revision.
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This adds support for the missing Non-maskable Interrupts (FEAT_NMI)
feature from armv8.8-A, which consists of the `ALLINT` pstate register.

This is a second iteration of the patch from D131389 <https://reviews.llvm.org/D131389>, building on top of
the D139925 <https://reviews.llvm.org/D139925> changes that enable better support for `msr (immediate)`
instructions that take 1-bit immediates.

Contributors:

- David Candler
- Tomas Matheson
- Sam Elliott


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140216

Files:
  llvm/lib/Target/AArch64/AArch64.td
  llvm/lib/Target/AArch64/AArch64SystemOperands.td
  llvm/test/MC/AArch64/armv8.8a-nmi-error.s
  llvm/test/MC/AArch64/armv8.8a-nmi.s
  llvm/test/MC/Disassembler/AArch64/armv8.8a-nmi.txt

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