[all-commits] [llvm/llvm-project] 960c97: [AArch64] Expand scmp/ucmp vector operations with ...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 960c975acd86b0135aac9396ffd311cb94e479b9
      https://github.com/llvm/llvm-project/commit/960c975acd86b0135aac9396ffd311cb94e479b9
  Author: David Green <david.green at arm.com>
  Date:   2024-09-16 (Mon, 16 Sep 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/BasicTTIImpl.h
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/lib/Target/SystemZ/SystemZISelLowering.h
    M llvm/test/Analysis/CostModel/AArch64/cmp.ll
    M llvm/test/CodeGen/AArch64/scmp.ll
    M llvm/test/CodeGen/AArch64/ucmp.ll

  Log Message:
  -----------
  [AArch64] Expand scmp/ucmp vector operations with sub (#108830)

Unlike scalar, where AArch64 prefers expanding scmp/ucmp with select,
under Neon we can use the arithmetic expansion to generate fewer
instructions. Notably it also prevents the scalarization of vselect
during vector-legalization.



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