[PATCH] D158673: [SDAG][RISCV] Avoid neg instructions when lowering atomic_load_sub with a constant rhs

[Yingwei Zheng via Phabricator via llvm-commits]

dtcxzyw added a comment.

In D158673#4623269 <https://reviews.llvm.org/D158673#4623269>, @craig.topper wrote:

> I think this patch would change behavior `atomicrmw sub` for mips16, but it looks to be untested. `llvm/test/CodeGen/Mips/atomicops.ll` is the mips16 atomic test but it does not check all operations.

I will add some pre-commit tests later.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D158673/new/

https://reviews.llvm.org/D158673