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support automatic lifetime qualifier on procedural variables

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likeamahoney 2026-02-27 20:42:40 +03:00
parent 687a36af38
commit e9442194f2
3 changed files with 129 additions and 5 deletions
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12
frontends/ast/genrtlil.cc
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@ -403,6 +403,18 @@ struct AST_INTERNAL::ProcessGenerator
if (GetSize(syncrule->signal) != 1)
always->input_error("Found posedge/negedge event on a signal that is not 1 bit wide!\n");
addChunkActions(syncrule->actions, subst_lvalue_from, subst_lvalue_to, true);
// Automatic (nosync) variables must not become flip-flops: remove
// them from clocked sync rules so that proc_dff does not infer
// an unnecessary register for a purely combinational temporary.
syncrule->actions.erase(
std::remove_if(syncrule->actions.begin(), syncrule->actions.end(),
[](const RTLIL::SigSig &ss) {
for (auto &chunk : ss.first.chunks())
if (chunk.wire && chunk.wire->get_bool_attribute(ID::nosync))
return true;
return false;
}),
syncrule->actions.end());
proc->syncs.push_back(syncrule);
}
if (proc->syncs.empty()) {