[PATCH] D146835: [RISCV] Enable usubo formation in CodeGenPrepare.

[Alex Bradbury via Phabricator via llvm-commits]

asb added a comment.

I start writing a comment grumbling that this adds undesirably tight coupling between with the implementation details of `TargetLowering::shouldFormOverflowOp`, but when I got to the end of it figured it wasn't that bad. If the comment had just said "Allow the transform whenever it would be allowed for UADDO" I might not have commented. LGTM. Though an assert like you suggest probably makes sense.


Repository:
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  https://reviews.llvm.org/D146835/new/

https://reviews.llvm.org/D146835