[all-commits] [llvm/llvm-project] 2f4f8f: [X86] Don't add DELETED_NODES to DAG combine workl...

[topperc via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 2f4f8fcf64c67ee327e19b74a82a2330cfb32312
      https://github.com/llvm/llvm-project/commit/2f4f8fcf64c67ee327e19b74a82a2330cfb32312
  Author: Craig Topper <craig.topper at gmail.com>
  Date:   2020-03-01 (Sun, 01 Mar 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    A llvm/test/CodeGen/X86/pr45067.ll

  Log Message:
  -----------
  [X86] Don't add DELETED_NODES to DAG combine worklist after calling SimplifyDemandedBits/SimplifyDemandedVectorElts.

These AddToWorklist calls were added in 84cd968f75bbd6e0fbabecc29d2c1090263adec7.
It's possible the SimplifyDemandedBits/SimplifyDemandedVectorElts
triggered CSE that deleted N. Detect that and avoid adding N
to the worklist.

Fixes PR45067.