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opt_clean: Fix module keep rules. 

- wires with keep attribute now force a module to be kept
- presence of $memwr and $meminit cells no longer forces a module to be
  kept
This commit is contained in:
Marcelina Kościelnicka 2020-08-09 13:53:01 +02:00
parent 9a4f420b4b
commit 2ab350a7b0
1 changed files with 9 additions and 4 deletions
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13
passes/opt/opt_clean.cc
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@ -55,7 +55,12 @@ struct keep_cache_t
if (!module->get_bool_attribute(ID::keep)) {
bool found_keep = false;
for (auto cell : module->cells())
if (query(cell, true /* ignore_specify */)) {
if (query(cell, true /* ignore_specify_mem */)) {
found_keep = true;
break;
}
for (auto wire : module->wires())
if (wire->get_bool_attribute(ID::keep)) {
found_keep = true;
break;
}
@ -65,12 +70,12 @@ struct keep_cache_t
return cache[module];
}
bool query(Cell *cell, bool ignore_specify = false)
bool query(Cell *cell, bool ignore_specify_mem = false)
{
if (cell->type.in(ID($memwr), ID($meminit), ID($assert), ID($assume), ID($live), ID($fair), ID($cover)))
if (cell->type.in(ID($assert), ID($assume), ID($live), ID($fair), ID($cover)))
return true;
if (!ignore_specify && cell->type.in(ID($specify2), ID($specify3), ID($specrule)))
if (!ignore_specify_mem && cell->type.in(ID($memwr), ID($meminit), ID($specify2), ID($specify3), ID($specrule)))
return true;
if (cell->has_keep_attr())