[all-commits] [llvm/llvm-project] 4c853b: [AArch64] Replace uaddlv with addv for popcount op...

[Usha Gupta via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4c853be6673fd95b4b900a6c0e1804bf33a0629c
      https://github.com/llvm/llvm-project/commit/4c853be6673fd95b4b900a6c0e1804bf33a0629c
  Author: Usha Gupta <usha.gupta at arm.com>
  Date:   2025-01-10 (Fri, 10 Jan 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/arm64-popcnt.ll
    M llvm/test/CodeGen/AArch64/dp1.ll
    M llvm/test/CodeGen/AArch64/parity.ll
    M llvm/test/CodeGen/AArch64/popcount.ll

  Log Message:
  -----------
  [AArch64] Replace uaddlv with addv for popcount operation (#121934)

Replace `uaddlv` with `addv` for popcount operation as it is simpler
operation.

On certain platforms like Cortex-A510, `addv` has a latency of 3 cycles
whereas `uaddlv` has a latency of 4 cycles

GCC generates `addv` as well:
https://godbolt.org/z/MnYG9jcEo



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