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Author SHA1 Message Date
David Bolvansky 2fa7fb14ea [DAGCombiner] Bug 31275- Extract a shift from a constant mul or udiv if a rotate can be formed 
Summary:
Attempt to extract a shrl from a udiv or a shl from a mul if this allows a rotate to be formed.  This targets cases where the input to a rotate pattern was a mul or udiv by a constant and InstCombine merged one of the shifts with the op.

Patch by: sameconrad (Sam Conrad)

Reviewers: RKSimon, craig.topper, spatel, lebedev.ri, javed.absar

Reviewed By: lebedev.ri

Subscribers: efriedma, kparzysz, llvm-commits

Differential Revision: https://reviews.llvm.org/D47681

llvm-svn: 338270
 2018-07-30 16:50:00 +00:00
Simon Pilgrim bfb900d363 [DAGCombiner] Add rotate-extract tests 
Add new tests from D47681 to current codegen. Also added i686 codegen tests.

llvm-svn: 337445
 2018-07-19 09:27:34 +00:00