[all-commits] [llvm/llvm-project] cde011: [SLP] Drop nsw when mul by INT_MIN is converted to...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cde011852d0b7d08c820f7d623655e5f354a50c8
      https://github.com/llvm/llvm-project/commit/cde011852d0b7d08c820f7d623655e5f354a50c8
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-07-07 (Tue, 07 Jul 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/mul-shl-nsw-intmin.ll

  Log Message:
  -----------
  [SLP] Drop nsw when mul by INT_MIN is converted to shl

mul nsw X, INT_MIN is valid, but shl X, BW-1 is not nsw-safe. Drop nsw on
the vector shl when a mul lane with INT_MIN is unified into shl during
opcode interchange.

Fixes #207990

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/208028



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications