[PATCH] D110069: AArch64: use `CAS` instead of `LDX`/`STX` for more ops if available

[Tim Northover via Phabricator via llvm-commits]

t.p.northover created this revision.
Herald added subscribers: hiraditya, kristof.beyls, mcrosier.
t.p.northover requested review of this revision.
Herald added a project: LLVM.

This covers 128-bit loads, and atomicrmw operations without a single native instruction. Using `CAS` saves a bit of code size and has a better chance of succeeding with high contention on some systems.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110069

Files:
  llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
  llvm/test/CodeGen/AArch64/GlobalISel/arm64-atomic-128.ll
  llvm/test/CodeGen/AArch64/GlobalISel/arm64-atomic.ll
  llvm/test/CodeGen/AArch64/arm64-atomic-128.ll
  llvm/test/CodeGen/AArch64/atomic-ops-lse.ll
  llvm/test/CodeGen/AArch64/atomicrmw-xchg-fp.ll

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