[all-commits] [llvm/llvm-project] c4f723: [LV] Strip unmaintainable MinBWs assert (#136858)

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c4f723a7c3bb12ce4e247bcaed755c8d927f73a4
      https://github.com/llvm/llvm-project/commit/c4f723a7c3bb12ce4e247bcaed755c8d927f73a4
  Author: Ramkumar Ramachandra <ramkumar.ramachandra at codasip.com>
  Date:   2025-05-08 (Thu, 08 May 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    A llvm/test/Transforms/LoopVectorize/pr125278.ll

  Log Message:
  -----------
  [LV] Strip unmaintainable MinBWs assert (#136858)

tryToWiden attempts to replace an Instruction with a Constant from SCEV,
but forgets to erase the Instruction from the MinBWs map, leading to an
assert in VPlanTransforms::truncateToMinimalBitwidths. Going forward,
the assertion in truncateToMinimalBitwidths is unmaintainable, as LV
could simplify the expression at any point: fix the bug by stripping the
unmaintable assertion.

Fixes #125278.



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