[all-commits] [llvm/llvm-project] c73ad7: [VPlan] Add transformation to narrow interleave gr...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c73ad7ba204fa05b074c1316b2244063aa10410f
      https://github.com/llvm/llvm-project/commit/c73ad7ba204fa05b074c1316b2244063aa10410f
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-03-20 (Thu, 20 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlan.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.h
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory-unroll.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory.ll

  Log Message:
  -----------
  [VPlan] Add transformation to narrow interleave groups.

This patch adds a new narrowInterleaveGroups transfrom, which tries
convert a plan with interleave groups with VF elements to a plan that
instead replaces the interleave groups with wide loads and stores
processing VF elements.

This effectively is a very simple form of loop-aware SLP, where we
use interleave groups to identify candidates.

This initial version is quite restricted and hopefully serves as a
starting point for how to best model those kinds of transforms. For now
it only transforms load interleave groups feeding store groups.

Depends on #106431.

This lands the main parts of the approved
https://github.com/llvm/llvm-project/pull/106441 as suggested to break
things up a bit more.



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