[all-commits] [llvm/llvm-project] 94bb1b: [AArch64][TTI] Increase cost for masked memory ope...

[Graham Hunter via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 94bb1b0590f43b517f290053b74e72e38101aa9b
      https://github.com/llvm/llvm-project/commit/94bb1b0590f43b517f290053b74e72e38101aa9b
  Author: Graham Hunter <graham.hunter at arm.com>
  Date:   2026-04-14 (Tue, 14 Apr 2026)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/AArch64/masked_ldst.ll
    M llvm/test/Analysis/CostModel/AArch64/masked_ldst_vls.ll

  Log Message:
  -----------
  [AArch64][TTI] Increase cost for masked memory operations requiring splitting (#191417)

If we need to split the memory operation, we'll also need to split the
mask.

This has a performance benefit in some cases when the loop vectorizer is
asked to maximize bandwidth and ends up choosing a VF that's too high
when tail folding. The costs of splitting the masks are not accounted
for in the current model, so this is something of a brute-force approach
to avoiding the wider VFs.



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