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Final #m33 #rp2350 #pico2 fast gamma lut calc optimization: * Gamma integer input: 1000 to 3000 (exact 1/1000 steps) * 8b to 16b: 23 instr/2 entries (Max err 0/+1 LSB) * 8b to max 23b: 22 instr/2 entries (Max err -18/+20 LSB for 23b, ~halves for each bit down) (Both plus loop overhead - 2 instr)