[all-commits] [llvm/llvm-project] 69effe: [SLP]Check for potential safety of the truncation ...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 69effe054c136defda8766688ac0de4626a0eb05
      https://github.com/llvm/llvm-project/commit/69effe054c136defda8766688ac0de4626a0eb05
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2025-02-27 (Thu, 27 Feb 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/ext-used-scalar-different-bitwidth.ll

  Log Message:
  -----------
  [SLP]Check for potential safety of the truncation for vectorized scalars with multi uses

If the vectorized scalars has multiple uses, need to check if it is safe
to truncate the vectorized value, before actually trying doing it.
Otherwise, the compiler may loose some important bits, which may lead to
a miscompilation.

Fixes #129057



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