[all-commits] [llvm/llvm-project] 577631: Reapply "[VPlan] Add transformation to narrow inte...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 577631f0a52884384786bf899951e3094ad7f69c
      https://github.com/llvm/llvm-project/commit/577631f0a52884384786bf899951e3094ad7f69c
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-03-25 (Tue, 25 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-unroll.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory-with-wide-ops.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/transform-narrow-interleave-to-widen-memory.ll
    M llvm/test/Transforms/LoopVectorize/X86/transform-narrow-interleave-to-widen-memory.ll

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

This reverts commit ff3e2ba9eb94217f3ad3525dc18b0c7b684e0abf.

The recommmitted version limits to transform to cases where no
interleaving is taking place, to avoid a mis-compile when interleaving.

Original commit message:

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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