[PATCH] D34760: [LV] Fix PR33613 - retain order of insertelements per part

[Ayal Zaks via Phabricator via llvm-commits]

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

Packing scalar values into vectors was originally done by generating the insertelements for all parts as a single sequence, immediately following the last scalar being packed. When changing the interface of ValueMap to getOrCreateVectorValue **per part** in r306381 (https://reviews.llvm.org/D32871), these insertelements were still generated immediately following the same last scalar, but their order per part got reversed because of this. This in turn broke the shuffle of first-order-recurrence, which assumes the insertelements of the last part UF-1 appears after the insertelements of all other parts.

This patch places each set of insertelements following the last scalar of that part, effectively supporting the above assumption.


https://reviews.llvm.org/D34760

Files:
  lib/Transforms/Vectorize/LoopVectorize.cpp
  test/Transforms/LoopVectorize/first-order-recurrence.ll

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