[PATCH] D59391: [X86] Add post-isel pseudos for rotate by immediate using SHLD/SHRD

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a reviewer: andreadb.
RKSimon added a subscriber: andreadb.
RKSimon added a comment.

I've been toying with the idea of using a pseudo for all SHLD/SHRD cases so we can make it easier to select between that and the expanded shift pattern depending on scheduler-model/register-pressure etc. instead of trying to make the decision in DAG with the feature bits. I don't know if this could be a first step towards this? @andreadb Any thoughts?


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