one of my pet peeves of common computers is that they don't have a generalized LUT2 instruction. why do you pick out a handful of specific bitwise ops for me wh

one of my pet peeves of common computers is that they don't have a generalized LUT2 instruction. why do you pick out a handful of specific bitwise ops for me when all 16 are lying in reach! a mere 4 bit look up table! let ix = a | b<<1 (lut & (1 << ix)) >> ix