[PATCH] D118843: [x86] avoid false dependency stall on 'sbb' with same source reg

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D118843#3292007 <https://reviews.llvm.org/D118843#3292007>, @craig.topper wrote:

> I think I prefer the opposite tuning flag polarity. It's not truely a false dep. It's more of a missed special case. The semantics of SBB imply the sources are read.

+1 TuningSBBDepBreaking flag makes more sense as an opt-in optimization


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