[all-commits] [llvm/llvm-project] 9593cd: [instcombine] Drop zext nneg flag when simplify op...

[Philip Reames via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9593cde70b5a6fd7d0ab53d04f99c52f4531394c
      https://github.com/llvm/llvm-project/commit/9593cde70b5a6fd7d0ab53d04f99c52f4531394c
  Author: Philip Reames <preames at rivosinc.com>
  Date:   2023-11-02 (Thu, 02 Nov 2023)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/test/Transforms/InstCombine/zext.ll

  Log Message:
  -----------
  [instcombine] Drop zext nneg flag when simplify operand (#71088)

This fixes a miscompile introduced in the recent #67982, and likely
exposed in changes since to infer and leverage the same. No active bug
reports as of yet.

This was noticed in
https://github.com/llvm/llvm-project/pull/70858#discussion_r1378203532.