[PATCH] D42479: DAGCombiner: Combine SDIV with non-splat vector pow2 divider

[Zvi Rackover via Phabricator via llvm-commits]

zvi created this revision.
zvi added reviewers: RKSimon, craig.topper, spatel, hfinkel, efriedma.

Extend existing SDIV combine for pow2 constant divider to handle
non-splat vectors of pow2 constants.

Since the combine expands to shifts with vector variable shift amount,
added a TLI hook for querying about profitability of the expansion.


Repository:
  rL LLVM

https://reviews.llvm.org/D42479

Files:
  include/llvm/CodeGen/TargetLowering.h
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  test/CodeGen/X86/combine-sdiv.ll

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