[all-commits] [llvm/llvm-project] d94dc5: [SLP]Fix PR86763: do not truncate reductions to th...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d94dc5f0d63be3d786224f57c061ef16687fca9a
      https://github.com/llvm/llvm-project/commit/d94dc5f0d63be3d786224f57c061ef16687fca9a
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2024-03-27 (Wed, 27 Mar 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/RISCV/reduction-extension-after-bitwidth.ll
    M llvm/test/Transforms/SLPVectorizer/SystemZ/minbitwidth-root-trunc.ll

  Log Message:
  -----------
  [SLP]Fix PR86763: do not truncate reductions to the demanded bits size.

Need to adjust ReductionBitWIdth after minbitwidth analysis, if the
demanded bits analysis sjows tht its size is less than the size of the
vectorized value. It prevents incorrect sign-zero extension
transformation after.



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