[PATCH] D22869: [LV] Generate both scalar and vector integer induction variables

[Matthew Simpson via llvm-commits]

mssimpso created this revision.
mssimpso added reviewers: anemet, mkuper.
mssimpso added subscribers: llvm-commits, mcrosier.
Herald added a subscriber: mzolotukhin.

This patch enables the vectorizer to generate both scalar and vector versions of an integer induction variable for a given loop. If all users of an induction variable will be scalarized, we generate a scalar induction variable. Conversely, if all users will be vectorized, we generate a vector induction variable. If an induction variable has a mix of scalarized and vectorized users, we generate both versions.

https://reviews.llvm.org/D22869

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/X86/scatter_crash.ll
  test/Transforms/LoopVectorize/induction.ll

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