yosys/techlibs/ice40/abc_hx.box

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# From https://github.com/cliffordwolf/icestorm/blob/be0bca0/icefuzz/timings_hx8k.txt
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# NB: Inputs/Outputs must be ordered alphabetically
# Inputs: CI I0 I1
# Outputs: CO
SB_CARRY 1 1 3 1
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126 259 231
# Inputs: I0 I1 I2 I3
# Outputs: O
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SB_LUT4 2 0 4 1
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449 400 379 316