[all-commits] [llvm/llvm-project] f12078: [SelectionDAG] Folding ZERO-EXTEND/SIGN_EXTEND po...

[zhijian lin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f12078e72601e7c03e5d66afab034313caf8f791
      https://github.com/llvm/llvm-project/commit/f12078e72601e7c03e5d66afab034313caf8f791
  Author: zhijian lin <zhijian at ca.ibm.com>
  Date:   2025-04-21 (Mon, 21 Apr 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/test/CodeGen/AArch64/arm64-bitfield-extract.ll
    M llvm/test/CodeGen/AArch64/optimize-cond-branch.ll
    M llvm/test/CodeGen/AArch64/sve-extract-element.ll
    M llvm/test/CodeGen/AMDGPU/amdgcn.bitcast.16bit.ll
    M llvm/test/CodeGen/AMDGPU/atomic_optimizations_global_pointer.ll
    M llvm/test/CodeGen/AMDGPU/ctpop16.ll
    M llvm/test/CodeGen/AMDGPU/dead-machine-elim-after-dead-lane.ll
    M llvm/test/CodeGen/AMDGPU/mdt-preserving-crash.ll
    M llvm/test/CodeGen/PowerPC/undef-args.ll
    M llvm/test/CodeGen/RISCV/miss-sp-restore-eh.ll

  Log Message:
  -----------
  [SelectionDAG] Folding  ZERO-EXTEND/SIGN_EXTEND poison to Poison value in getNode (#122741)

The PR will fix the issue
https://github.com/llvm/llvm-project/issues/122728

This patch addresses the signed/zero extension of poison by using a
poison value of the extended type instead of a constant zero of the
extended type.



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