[all-commits] [llvm/llvm-project] 884c03: [LV] Return Invalid from getLegacyCost when instru...

[Kerry McLaughlin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 884c03e71bf9ae6a36a578e025b2e9f19dd392c2
      https://github.com/llvm/llvm-project/commit/884c03e71bf9ae6a36a578e025b2e9f19dd392c2
  Author: Kerry McLaughlin <kerry.mclaughlin at arm.com>
  Date:   2025-08-26 (Tue, 26 Aug 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/force-target-instruction-cost.ll

  Log Message:
  -----------
  [LV] Return Invalid from getLegacyCost when instruction cost forced. (#154543)

LoopVectorizationCostModel::expectedCost will only override the cost
returned by getInstructionCost when valid. This patch ensures we do
the same in VPCostContext::getLegacyCost, avoiding the "VPlan cost
model and legacy cost model disagreed" assert in the included test.



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