[all-commits] [llvm/llvm-project] 5e7631: [LoongArch][DAGCombiner] Combine vand (vnot ..) to...

[Zhaoxin Yang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5e7631e14ae334a708b6fc52991a12ab3bb95633
      https://github.com/llvm/llvm-project/commit/5e7631e14ae334a708b6fc52991a12ab3bb95633
  Author: Zhaoxin Yang <yangzhaoxin at loongson.cn>
  Date:   2025-11-25 (Tue, 25 Nov 2025)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchLASXInstrInfo.td
    M llvm/lib/Target/LoongArch/LoongArchLSXInstrInfo.td
    M llvm/test/CodeGen/LoongArch/lasx/and-not-combine.ll
    M llvm/test/CodeGen/LoongArch/lsx/and-not-combine.ll

  Log Message:
  -----------
  [LoongArch][DAGCombiner] Combine vand (vnot ..) to vandn (#161037)

After this commit, DAGCombiner will have more opportunities to perform
vector folding. This patch includes several foldings, as follows:
- VANDN(x,NOT(y)) -> AND(NOT(x),NOT(y)) -> NOT(OR(X,Y))
- VANDN(x, SplatVector(Imm)) -> AND(NOT(x), NOT(SplatVector(~Imm)))



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