[all-commits] [llvm/llvm-project] a93607: [AArch64] Remove always true Perfect cost check. NFC

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a93607c479092ccae41c033f8d27fe99621ddef3
      https://github.com/llvm/llvm-project/commit/a93607c479092ccae41c033f8d27fe99621ddef3
  Author: David Green <david.green at arm.com>
  Date:   2022-04-08 (Fri, 08 Apr 2022)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp

  Log Message:
  -----------
  [AArch64] Remove always true Perfect cost check. NFC

Perfect shuffle costs are always encoded less than 4, and shouldn't
really have a cost more than 3, so it makes no sense to check it when
generating shuffles. The perfect shuffle is likely always better than a
tbl too (although that may depend on whether it is in a loop).