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Improve opt_clean handling of unused public wires 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-06-26 17:54:17 +02:00
parent 1b49380f6b
commit 0b7d648c6a
1 changed files with 2 additions and 2 deletions
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4
passes/opt/opt_clean.cc
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@ -326,8 +326,8 @@ bool rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbos
if (wire->port_id != 0 || wire->get_bool_attribute("\\keep") || !initval.is_fully_undef()) {
// do not delete anything with "keep" or module ports or initialized wires
} else
if (!purge_mode && check_public_name(wire->name)) {
// do not get rid of public names unless in purge mode
if (!purge_mode && check_public_name(wire->name) && (raw_used_signals.check_any(s1) || used_signals.check_any(s2) || s1 != s2)) {
// do not get rid of public names unless in purge mode or if the wire is entirely unused, not even aliased
} else
if (!raw_used_signals.check_any(s1)) {
// delete wires that aren't used by anything directly