opt_clean: Add `-coarse` mode

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Yosys Open SYnthesis Suite

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opt_clean: Add `-coarse` mode #4267

Open povik opened 4 months ago

povik commented 4 months ago

    -coarse
        perform a fast, conservative clean-up in which no public wires are
        removed and wire usage is analyzed at a coarse level without
        distinguishing individual bits

povik commented 4 months ago

This mode preserves the direction of connections (see issue #3426).