diff options
Diffstat (limited to 'passes/opt/opt_muxtree.cc')
| -rw-r--r-- | passes/opt/opt_muxtree.cc | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/passes/opt/opt_muxtree.cc b/passes/opt/opt_muxtree.cc index d1f4e7b1..9d622d6a 100644 --- a/passes/opt/opt_muxtree.cc +++ b/passes/opt/opt_muxtree.cc @@ -396,7 +396,20 @@ struct OptMuxtreeWorker }; struct OptMuxtreePass : public Pass { - OptMuxtreePass() : Pass("opt_muxtree") { } + OptMuxtreePass() : Pass("opt_muxtree", "eliminate dead trees in multiplexer trees") { } + virtual void help() + { + // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---| + log("\n"); + log(" opt_muxtree [selection]\n"); + log("\n"); + log("This pass analyzes the control signals for the multiplexer trees in the design\n"); + log("and identifies inputs that can never be active. In then removes this dead\n"); + log("branches from the multiplexer trees.\n"); + log("\n"); + log("This pass only operates on completely selected modules without processes.\n"); + log("\n"); + } virtual void execute(std::vector<std::string> args, RTLIL::Design *design) { log_header("Executing OPT_MUXTREE pass (detect dead branches in mux trees).\n"); @@ -404,8 +417,13 @@ struct OptMuxtreePass : public Pass { int total_count = 0; for (auto &mod_it : design->modules) { + if (!design->selected_whole_module(mod_it.first)) { + if (design->selected(mod_it.second)) + log("Skipping module %s as it is only partially selected.\n", id2cstr(mod_it.second->name)); + continue; + } if (mod_it.second->processes.size() > 0) { - log("Skipping module %s as it contains processes.\n", mod_it.second->name.c_str()); + log("Skipping module %s as it contains processes.\n", id2cstr(mod_it.second->name)); } else { OptMuxtreeWorker worker(design, mod_it.second); total_count += worker.removed_count; |