[PATCH] D24279: [InstCombine] canonicalize vector select with constant vector condition to shuffle

[Sanjay Patel via llvm-commits]

spatel created this revision.
spatel added reviewers: efriedma, hfinkel, reames, mkuper, majnemer.
spatel added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

As discussed on llvm-dev ( http://lists.llvm.org/pipermail/llvm-dev/2016-August/104210.html ): turn a vector select into a shuffle when possible as a canonicalization step. Shuffles may be easier to reason about in conjunction with other shuffles and insert/extract.

https://reviews.llvm.org/D24279

Files:
  lib/Transforms/InstCombine/InstCombineSelect.cpp
  test/Transforms/InstCombine/blend_x86.ll
  test/Transforms/InstCombine/logical-select.ll
  test/Transforms/InstCombine/select.ll
  test/Transforms/InstCombine/vec_demanded_elts.ll

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