[all-commits] [llvm/llvm-project] c16559: [IndVars] Avoid unnecessary truncate for zext nneg...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c16559137cd1ad08ef5934558829d2ff5d227d70
      https://github.com/llvm/llvm-project/commit/c16559137cd1ad08ef5934558829d2ff5d227d70
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2023-12-22 (Fri, 22 Dec 2023)

  Changed paths:
    M llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
    M llvm/test/Transforms/IndVarSimplify/widen-nonnegative.ll

  Log Message:
  -----------
  [IndVars] Avoid unnecessary truncate for zext nneg use

When performing sext IV widening, if one of the narrow uses is in
a zext nneg, we can treat it like an sext and avoid the insertion
of a trunc.