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Option to include unused bits attribute or not

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This commit is contained in:
Akash Levy 2024-08-14 22:05:12 -07:00
parent 34e5bc1129
commit 35c19cb391
1 changed files with 15 additions and 7 deletions
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22
passes/opt/opt_clean.cc
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@ -298,7 +298,7 @@ bool check_public_name(RTLIL::IdString id)
return true; return true;
} }
bool rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbose) bool rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool unusedbitsattr_mode, bool verbose)
{ {
// `register_signals` and `connected_signals` will help us decide later on // `register_signals` and `connected_signals` will help us decide later on
// on picking representatives out of groups of connected signals // on picking representatives out of groups of connected signals
@ -485,7 +485,7 @@ bool rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbos
} }
if (unused_bits.empty() || wire->port_id != 0) if (unused_bits.empty() || wire->port_id != 0)
wire->attributes.erase(ID::unused_bits); wire->attributes.erase(ID::unused_bits);
else else if (unusedbitsattr_mode)
wire->attributes[ID::unused_bits] = RTLIL::Const(unused_bits); wire->attributes[ID::unused_bits] = RTLIL::Const(unused_bits);
} else { } else {
wire->attributes.erase(ID::unused_bits); wire->attributes.erase(ID::unused_bits);
@ -594,7 +594,7 @@ bool rmunused_module_init(RTLIL::Module *module, bool verbose)
return did_something; return did_something;
} }
void rmunused_module(RTLIL::Module *module, bool purge_mode, bool verbose, bool rminit) void rmunused_module(RTLIL::Module *module, bool purge_mode, bool unusedbitsattr_mode, bool verbose, bool rminit)
{ {
if (verbose) if (verbose)
log("Finding unused cells or wires in module %s..\n", module->name.c_str()); log("Finding unused cells or wires in module %s..\n", module->name.c_str());
@ -619,10 +619,10 @@ void rmunused_module(RTLIL::Module *module, bool purge_mode, bool verbose, bool
module->design->scratchpad_set_bool("opt.did_something", true); module->design->scratchpad_set_bool("opt.did_something", true);
rmunused_module_cells(module, verbose); rmunused_module_cells(module, verbose);
while (rmunused_module_signals(module, purge_mode, verbose)) { } while (rmunused_module_signals(module, purge_mode, unusedbitsattr_mode, verbose)) { }
if (rminit && rmunused_module_init(module, verbose)) if (rminit && rmunused_module_init(module, verbose))
while (rmunused_module_signals(module, purge_mode, verbose)) { } while (rmunused_module_signals(module, purge_mode, unusedbitsattr_mode, verbose)) { }
} }
struct OptCleanPass : public Pass { struct OptCleanPass : public Pass {
@ -643,10 +643,14 @@ struct OptCleanPass : public Pass {
log(" -purge\n"); log(" -purge\n");
log(" also remove internal nets if they have a public name\n"); log(" also remove internal nets if they have a public name\n");
log("\n"); log("\n");
log(" -unusedbitsattr\n");
log(" add an unused_bits attribute onto wires for bits that are not used\n");
log("\n");
} }
void execute(std::vector<std::string> args, RTLIL::Design *design) override void execute(std::vector<std::string> args, RTLIL::Design *design) override
{ {
bool purge_mode = false; bool purge_mode = false;
bool unusedbitsattr_mode = false;
log_header(design, "Executing OPT_CLEAN pass (remove unused cells and wires).\n"); log_header(design, "Executing OPT_CLEAN pass (remove unused cells and wires).\n");
log_push(); log_push();
@ -657,6 +661,10 @@ struct OptCleanPass : public Pass {
purge_mode = true; purge_mode = true;
continue; continue;
} }
if (args[argidx] == "-unusedbitsattr") {
unusedbitsattr_mode = true;
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
@ -675,7 +683,7 @@ struct OptCleanPass : public Pass {
for (auto module : design->selected_whole_modules_warn()) { for (auto module : design->selected_whole_modules_warn()) {
if (module->has_processes_warn()) if (module->has_processes_warn())
continue; continue;
rmunused_module(module, purge_mode, true, true); rmunused_module(module, purge_mode, unusedbitsattr_mode, true, true);
} }
if (count_rm_cells > 0 || count_rm_wires > 0) if (count_rm_cells > 0 || count_rm_wires > 0)
@ -737,7 +745,7 @@ struct CleanPass : public Pass {
for (auto module : design->selected_whole_modules()) { for (auto module : design->selected_whole_modules()) {
if (module->has_processes()) if (module->has_processes())
continue; continue;
rmunused_module(module, purge_mode, ys_debug(), true); rmunused_module(module, purge_mode, false, ys_debug(), true);
} }
log_suppressed(); log_suppressed();