[all-commits] [llvm/llvm-project] b0790e: [DAG] combineVSelectWithAllOnesOrZeros - fold sele...

[woruyu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b0790e04a370b8dbee9f839983641820c1b1b844
      https://github.com/llvm/llvm-project/commit/b0790e04a370b8dbee9f839983641820c1b1b844
  Author: woruyu <99597449+woruyu at users.noreply.github.com>
  Date:   2025-07-08 (Tue, 08 Jul 2025)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/sve-fixed-length-shuffles.ll
    M llvm/test/CodeGen/AArch64/vselect-constants.ll

  Log Message:
  -----------
  [DAG] combineVSelectWithAllOnesOrZeros - fold select Cond, 0, x -> and not(Cond), x (#147472)

### Summary
This patch extends the work from
[#145298](https://github.com/llvm/llvm-project/pull/145298) by removing
the now-unnecessary X86-specific combineVSelectWithLastZeros logic. That
combine is now correctly and more generally handled in the
target-independent combineVSelectWithAllOnesOrZeros.

This simplifies the X86 DAG combine logic and avoids duplication.

Fixes: [#144513](https://github.com/llvm/llvm-project/issues/144513)
Related for reference:
[#146831](https://github.com/llvm/llvm-project/pull/146831)



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