yosys/techlibs/ice40/abc_hx.box

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# 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 I0 I3 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_WRAPPER 1 1 5 2
400 379 449 316 316
259 231 - - 126