[PATCH] D108891: [LV] Fix crash for reverse interleaved loads with gap under fold-tail

[Ayal Zaks via Phabricator via llvm-commits]

Ayal created this revision.
Ayal added reviewers: fhahn, uabelho.
Herald added a subscriber: hiraditya.
Ayal requested review of this revision.
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This patch fixes the crash found by PR51614:
whenever doing tail folding, interleave groups must be considered under mask.

Another fix will follow for targets that support masked vector loads and stores:
when *deciding* to vectorize with masked interleave groups, check if the access
is reverse - which is currently not supported; rather than (only) asserting when
computing cost and generating code.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D108891

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/test/Transforms/LoopVectorize/pr51614-fold-tail-by-masking.ll

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