[all-commits] [llvm/llvm-project] 46ea4b: [LV] Avoid a crash when costing a uniform store wh...

Philip Reames via All-commits all-commits at lists.llvm.org
Thu Jun 23 12:41:57 PDT 2022

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 46ea4b5ea10f9363503b047a2e6a577a8603797d
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2022-06-23 (Thu, 23 Jun 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/RISCV/scalable-basics.ll

  Log Message:
  [LV] Avoid a crash when costing a uniform store which doesn't correspond to a legal scatter

If we have an unaligned uniform store, then when costing a scalable VF we can't emit code to scalarize it.  (Well, we could, but we haven't implemented that case.)  This change replaces an assert with a cost-model bailout such that we reject vectorization with the scalable VF instead of crashing.

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