[PATCH] D112085: [DAGCombiner] fold bit-hack form of usubsat

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D112085#3073396 <https://reviews.llvm.org/D112085#3073396>, @spatel wrote:

> This exposes potential x86 improvements for custom lowering for very old SSE and AVX512 targets (or the default expansion should be changed).

We already have custom usubsat expansion in LowerADDSAT_SUBSAT - adding the special case shouldn't be a problem.


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https://reviews.llvm.org/D112085