[id://spurperl] is right, table lookup is fastest. Using the notation op for [id://PerlingTheUK|original poster], lt for "lookup table", and the rest obvious, the overall benchmark looks something like this:
Rate op4 op5 hv7 hv6 roy4 kaif lt
op4 64233/s -- -33% -33% -52% -57% -72% -76%
op5 96098/s 50% -- -0% -28% -36% -58% -64%
hv7 96399/s 50% 0% -- -28% -35% -58% -64%
hv6 134032/s 109% 39% 39% -- -10% -41% -50%
roy4 149447/s 133% 56% 55% 12% -- -34% -45%
kaif 227019/s 253% 136% 135% 69% 52% -- -16%
lt 270514/s 321% 181% 181% 102% 81% 19% --
Just be sure to initialize your table outside of your function, that is, initialize only once.
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