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2c94ca85d9
We were performing the helper passes `abc9_ops -replace_zbufs` and `abc9_ops -restore_zbufs` for every module, but those passes act on the full design (and can't be applied entirely selectively due to entering and leaving bufnorm). This lead to an explosive creation of a lot of redundant bufnorm helper cells that would have been cleaned up by `clean` but that never ran. Instead we now run each helper pass once, one before and one after iterating over the selected modules. This limits the number of bufnorm helper cells. |
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