[all-commits] [llvm/llvm-project] d458a1: [AArch64] Mark AESD and AESE instructions as commu...

[David Green via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d458a1931769aa4bcdb3fcd537c4ee946507ff1a
      https://github.com/llvm/llvm-project/commit/d458a1931769aa4bcdb3fcd537c4ee946507ff1a
  Author: David Green <david.green at arm.com>
  Date:   2024-03-01 (Fri, 01 Mar 2024)

  Changed paths:
    M llvm/lib/Target/AArch64/AArch64InstrInfo.td
    M llvm/test/CodeGen/AArch64/aes.ll
    M llvm/test/CodeGen/AArch64/misched-fusion-aes.ll

  Log Message:
  -----------
  [AArch64] Mark AESD and AESE instructions as commutative. (#83390)

This come from
https://discourse.llvm.org/t/combining-aes-and-xor-can-be-improved-further/77248.

These instructions start out with:
```
  XOR Vd, Vn
  <some complicated math>
```
The initial XOR means that they can be treated as commutative, removing
some of the unnecessary mov's introduced during register allocation.



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