SUB has higher latency than XOR on some Intel CPUs:

latency (L) and throughput (T) measurements from the InstLatx64 project (https://github.com/InstLatx64/InstLatx64) :

  | GenuineIntel | ArrowLake_08_LC | SUB r64, r64 | L: 0.26ns=  1.00c  | T:   0.03ns=   0.135c |
  | GenuineIntel | ArrowLake_08_LC | XOR r64, r64 | L: 0.03ns=  0.13c  | T:   0.03ns=   0.133c |
  | GenuineIntel | GoldmontPlus    | SUB r64, r64 | L: 0.67ns=  1.0 c  | T:   0.22ns=   0.33 c |
  | GenuineIntel | GoldmontPlus    | XOR r64, r64 | L: 0.22ns=  0.3 c  | T:   0.22ns=   0.33 c |
  | GenuineIntel | Denverton       | SUB r64, r64 | L: 0.50ns=  1.0 c  | T:   0.17ns=   0.33 c |
  | GenuineIntel | Denverton       | XOR r64, r64 | L: 0.17ns=  0.3 c  | T:   0.17ns=   0.33 c |