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[TargetLowering] Improve expansion of ROTL/ROTR

Authored by foad on Jun 25 2020, 3:57 AM.



Using a negation instead of a subtraction from a constant can save an
instruction on some targets.

Nothing much uses this until D77152 changes the translation of fshl and
fshr intrinsics.

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foad created this revision.Jun 25 2020, 3:57 AM
Herald added a project: Restricted Project. · View Herald TranscriptJun 25 2020, 3:57 AM
arsenm accepted this revision.Jul 3 2020, 10:30 AM
This revision is now accepted and ready to land.Jul 3 2020, 10:30 AM
This revision was automatically updated to reflect the committed changes.