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opt_clean: Add -coarse mode #4267

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opt_clean: Add -coarse mode #4267

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@povik povik commented Mar 7, 2024 

    -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

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povik commented Mar 7, 2024
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passes/opt/opt_clean.cc
@@ -31,6 +31,156 @@ PRIVATE_NAMESPACE_BEGIN

using RTLIL::id2cstr;

bool should_be_kept(Design *d, Cell *cell)
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Before we merge (if we merge), we should get rid of this should_be_kept function and use keep_cache and the other code that's already there.

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povik commented Mar 7, 2024

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

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