# From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_hx8k.txt # NB: Inputs/Outputs must be ordered alphabetically # (with exceptions for carry in/out) # Inputs: A B CI # Outputs: O CO # (NB: carry chain input/output must be last # input/output and have been moved there # overriding the alphabetical ordering) $__ICE40_CARRY_LUT4 1 1 3 2 400 379 316 259 231 126