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opt_lut: count eliminated cells, and set opt.did_something for them.

This commit is contained in:
whitequark 2019-01-02 08:40:01 +00:00
parent 4b9f619349
commit f7363ac508
1 changed files with 20 additions and 6 deletions
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26
passes/opt/opt_lut.cc
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@ -36,7 +36,7 @@ struct OptLutWorker
dict<RTLIL::Cell*, pool<RTLIL::Cell*>> luts_dlogics; dict<RTLIL::Cell*, pool<RTLIL::Cell*>> luts_dlogics;
dict<RTLIL::Cell*, pool<int>> luts_dlogic_inputs; dict<RTLIL::Cell*, pool<int>> luts_dlogic_inputs;
int combined_count = 0; int eliminated_count = 0, combined_count = 0;
bool evaluate_lut(RTLIL::Cell *lut, dict<SigBit, bool> inputs) bool evaluate_lut(RTLIL::Cell *lut, dict<SigBit, bool> inputs)
{ {
@ -191,6 +191,12 @@ struct OptLutWorker
log("Eliminating LUTs.\n"); log("Eliminating LUTs.\n");
for (auto lut : luts) for (auto lut : luts)
{ {
if (limit == 0)
{
log("Limit reached.\n");
break;
}
SigSpec lut_input = sigmap(lut->getPort("\\A")); SigSpec lut_input = sigmap(lut->getPort("\\A"));
pool<int> &lut_dlogic_inputs = luts_dlogic_inputs[lut]; pool<int> &lut_dlogic_inputs = luts_dlogic_inputs[lut];
@ -263,6 +269,10 @@ struct OptLutWorker
luts_arity.erase(lut); luts_arity.erase(lut);
luts_dlogics.erase(lut); luts_dlogics.erase(lut);
luts_dlogic_inputs.erase(lut); luts_dlogic_inputs.erase(lut);
eliminated_count++;
if (limit > 0)
limit--;
} }
} }
} }
@ -568,16 +578,20 @@ struct OptLutPass : public Pass {
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
int total_count = 0; int eliminated_count = 0, combined_count = 0;
for (auto module : design->selected_modules()) for (auto module : design->selected_modules())
{ {
OptLutWorker worker(dlogic, module, limit - total_count); OptLutWorker worker(dlogic, module, limit - eliminated_count - combined_count);
total_count += worker.combined_count; eliminated_count += worker.eliminated_count;
combined_count += worker.combined_count;
} }
if (total_count) if (eliminated_count)
design->scratchpad_set_bool("opt.did_something", true);
if (combined_count)
design->scratchpad_set_bool("opt.did_something", true); design->scratchpad_set_bool("opt.did_something", true);
log("\n"); log("\n");
log("Combined %d LUTs.\n", total_count); log("Eliminated %d LUTs.\n", eliminated_count);
log("Combined %d LUTs.\n", combined_count);
} }
} OptLutPass; } OptLutPass;