yosys/techlibs/ice40/abc_u.box

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# From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_up5k.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
1231 1205 875
675 609 278