[PATCH] D22241: [LV] Avoid unnecessary IV scalar-to-vector-to-scalar conversions

[Matthew Simpson via llvm-commits]

mssimpso created this revision.
mssimpso added a reviewer: anemet.
mssimpso added subscribers: cmatthews, llvm-commits.
Herald added subscribers: mzolotukhin, mcrosier.

This patch prevents increases in the number of instructions, pre-instcombine, due to induction variable scalarization. An increase in instructions can lead to an increase in the compile-time required to simplify the induction variables. We now maintain a new map for scalarized induction variables to prevent us from converting between the scalar and vector forms.

http://reviews.llvm.org/D22241

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/reverse_induction.ll

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