[PATCH] D95139: [SVE][LoopVectorize] Add support for extracting the last lane of a scalable vector

[David Sherwood via Phabricator via llvm-commits]

david-arm updated this revision to Diff 323781.
david-arm added a comment.

- Added a new VPLane class to contain all the lane offset and kind, plus add methods getKnownValue and getExpr to return the compile-time value and runtime expression, respectively.
- Changed the definition of ScalableLast to Sander's suggestion where the lane value is the offset from the start of the last subvector.
- Folded some asserts about the lane value into VPLane::getKnownValue() and VPLane::mapToCacheIndex.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D95139/new/

https://reviews.llvm.org/D95139

Files:
  llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
  llvm/lib/Transforms/Vectorize/VPlan.cpp
  llvm/lib/Transforms/Vectorize/VPlan.h
  llvm/test/Transforms/LoopVectorize/AArch64/sve-extract-last-veclane.ll
  llvm/test/Transforms/LoopVectorize/extract-last-veclane.ll

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