[all-commits] [llvm/llvm-project] 87f424: [AArch64] Generate BSP instead of TBL for select s...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 87f4240230592a6ea2fc6c5ad2c189c372e1ea84
      https://github.com/llvm/llvm-project/commit/87f4240230592a6ea2fc6c5ad2c189c372e1ea84
  Author: David Green <david.green at arm.com>
  Date:   2025-01-13 (Mon, 13 Jan 2025)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/test/CodeGen/AArch64/arm64-neon-3vdiff.ll
    M llvm/test/CodeGen/AArch64/shuffle-select.ll

  Log Message:
  -----------
  [AArch64] Generate BSP instead of TBL for select shuffles. (#121474)

In using BIF/BIT/BSL the constant mask has a larger chance of being
regular, being able to be materialized with a movi. On some cpus the
BIF/BIT/BSL is slightly quicker too.



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