[PATCH] D35725: [LV] Avoid redundant operations manipulating masks

[Ayal Zaks via Phabricator via llvm-commits]

Ayal created this revision.
Herald added a subscriber: mzolotukhin.

Avoid generating redundant operations when manipulating masks: AND with true, OR with false, compare equal to true. Model all-one masks as a null (no-mask) following the convention for masked gathers and scatters.

These redundant operations get eliminated by subsequent passes. This patch is preparing for a follow-up VPlan patch in which these operations are modeled using recipes.


https://reviews.llvm.org/D35725

Files:
  lib/IR/IRBuilder.cpp
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/if-pred-non-void.ll
  test/Transforms/LoopVectorize/if-pred-stores.ll

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