[all-commits] [llvm/llvm-project] dfa665: [VPlan] Add transformation to narrow interleave gr...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dfa665f19c52d98b8d833a8e9073427ba5641b19
      https://github.com/llvm/llvm-project/commit/dfa665f19c52d98b8d833a8e9073427ba5641b19
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-03-22 (Sat, 22 Mar 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory-cost.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory-with-wide-ops.ll
    M llvm/test/Transforms/LoopVectorize/X86/transform-narrow-interleave-to-widen-memory.ll

  Log Message:
  -----------
  [VPlan] Add transformation to narrow interleave groups. (#106441)

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.

Depends on https://github.com/llvm/llvm-project/pull/106431.

Fixes https://github.com/llvm/llvm-project/issues/82936.

PR: https://github.com/llvm/llvm-project/pull/106441



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