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dft_tag: Implement $overwrite_tag and $original_tag

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This does not correctly handle an `$overwrite_tag` on a module output,
but since we currently require the user to flatten the design for
cross-module dft, this cannot be observed from within the design, only
by manually inspecting the signals in the design.
This commit is contained in:
Jannis Harder 2023-08-29 17:40:51 +02:00
parent 78ff40d1b2
commit 62b4df4989
4 changed files with 124 additions and 24 deletions
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3
passes/opt/opt_clean.cc
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@ -76,6 +76,9 @@ struct keep_cache_t
if (cell->type.in(ID($assert), ID($assume), ID($live), ID($fair), ID($cover)))
return true;
if (cell->type.in(ID($overwrite_tag)))
return true;
if (!ignore_specify && cell->type.in(ID($specify2), ID($specify3), ID($specrule)))
return true;