[PATCH] D29847: [LV] Extend trunc optimization to all IVs with constant integer steps

[Matthew Simpson via Phabricator via llvm-commits]

mssimpso updated this revision to Diff 88256.
mssimpso added a comment.

- I updated patch so that we extend the truncate optimization to non-primary induction variables only if the truncate isn't already free.
- I factored out the logic into a helper so we can keep things in sync easier.
- I added a test case for AArch64 showing that we keep a free truncate.


https://reviews.llvm.org/D29847

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/AArch64/induction-trunc.ll
  test/Transforms/LoopVectorize/induction.ll
  test/Transforms/LoopVectorize/reverse_iter.ll

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