[all-commits] [llvm/llvm-project] afda4c: Reland [SelectionDAG] Folding ZERO-EXTEND/SIGN_EXT...

[zhijian lin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: afda4c295b1f8c4c4011358eddc1a08e17cd5b4d
      https://github.com/llvm/llvm-project/commit/afda4c295b1f8c4c4011358eddc1a08e17cd5b4d
  Author: zhijian lin <zhijian at ca.ibm.com>
  Date:   2025-04-22 (Tue, 22 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
    M llvm/test/CodeGen/VE/Vector/ticket-64420.ll
    M llvm/test/CodeGen/X86/avx512-i1test.ll
    M llvm/test/CodeGen/X86/bfloat.ll
    M llvm/test/CodeGen/X86/clobber_frame_ptr.ll
    M llvm/test/CodeGen/X86/concat-fpext-v2bf16.ll
    M llvm/test/CodeGen/X86/jump_sign.ll
    M llvm/test/CodeGen/X86/machine-trace-metrics-crash.ll
    M llvm/test/CodeGen/X86/pr50254.ll
    M llvm/test/CodeGen/X86/pr57673.ll
    M llvm/test/CodeGen/X86/pr63108.ll
    M llvm/test/CodeGen/X86/pr91005.ll
    M llvm/test/CodeGen/X86/ragreedy-hoist-spill.ll
    M llvm/test/CodeGen/X86/shift-combine.ll
    M llvm/test/CodeGen/X86/shuffle-combine-crash.ll
    M llvm/test/CodeGen/X86/shuffle-half.ll
    M llvm/test/CodeGen/X86/swifterror.ll
    M llvm/test/CodeGen/X86/tailcall-cgp-dup.ll
    M llvm/test/CodeGen/X86/vaargs-prolog-insert.ll
    M llvm/test/CodeGen/X86/vector-shuffle-combining-avx512bwvl.ll
    M llvm/test/CodeGen/X86/x86-shrink-wrapping.ll

  Log Message:
  -----------
  Reland [SelectionDAG] Folding ZERO-EXTEND/SIGN_EXTEND poison to Poison value in getNode (#136701)

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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