yosys/techlibs/ice40/abc_lp.box

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# From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_lp8k.txt
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# NB: Inputs/Outputs must be ordered alphabetically
# (with exceptions for carry in/out)
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# 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)
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$__ICE40_CARRY_WRAPPER 1 1 5 2
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589 558 661 465 465
675 609 - - 186