[PATCH] D128513: AArch64: don't try to fold NZCV spill into an operation

[Tim Northover via Phabricator via llvm-commits]

t.p.northover created this revision.
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Only `mrs` & `msr` can access the `NZCV` flags register, so don't try to create any instructions spilling it.

Bit of an ugly test-case I'm afraid, so I decided the best way to limit scope for things to change and invalidate it was going the MIR route.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128513

Files:
  llvm/lib/Target/AArch64/AArch64InstrInfo.cpp
  llvm/test/CodeGen/AArch64/nospill-nzcv.mir

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