[all-commits] [llvm/llvm-project] 568415: [DAG] canCreateUndefOrPoison - add handling for CT...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 56841565db77af6eb668b59add3cb1d0f38875e8
      https://github.com/llvm/llvm-project/commit/56841565db77af6eb668b59add3cb1d0f38875e8
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-07-01 (Tue, 01 Jul 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/X86/freeze-unary.ll

  Log Message:
  -----------
  [DAG] canCreateUndefOrPoison - add handling for CTTZ/CTLZ_ZERO_UNDEF nodes (#146501)

CTTZ/CTLZ_ZERO_UNDEF nodes can only create poison if the source value is zero - so check with isKnownNeverZero

Pulled out of #146361 and reapplied now that #146490 has landed.



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