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opt_lut: collect and display statistics.

This commit is contained in:
whitequark 2018-12-05 12:35:27 +00:00
parent e54c7e951c
commit 59eea0183f
1 changed files with 33 additions and 4 deletions
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37
passes/opt/opt_lut.cpp
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@ -30,6 +30,11 @@ struct OptLutWorker
ModIndex index;
SigMap sigmap;
pool<RTLIL::Cell*> luts;
dict<RTLIL::Cell*, int> luts_arity;
int combined_count = 0;
bool evaluate_lut(RTLIL::Cell *lut, dict<SigBit, bool> inputs)
{
SigSpec lut_input = sigmap(lut->getPort("\\A"));
@ -53,12 +58,27 @@ struct OptLutWorker
return lut_table.extract(lut_index).as_int();
}
void show_stats_by_arity()
{
dict<int, int> arity_counts;
int max_arity = 0;
for (auto lut_arity : luts_arity)
{
max_arity = max(max_arity, lut_arity.second);
arity_counts[lut_arity.second]++;
}
log("Number of LUTs: %6zu\n", luts.size());
for (int arity = 1; arity <= max_arity; arity++)
{
if (arity_counts[arity])
log(" %d-LUT: %13d\n", arity, arity_counts[arity]);
}
}
OptLutWorker(RTLIL::Module *module) :
module(module), index(module), sigmap(module)
{
pool<RTLIL::Cell*> luts;
dict<RTLIL::Cell*, int> luts_arity;
log("Discovering LUTs.\n");
for (auto cell : module->selected_cells())
{
@ -79,10 +99,10 @@ struct OptLutWorker
luts_arity[cell] = lut_arity;
}
}
show_stats_by_arity();
log("\n");
log("Combining LUTs.\n");
pool<RTLIL::Cell*> worklist = luts;
while (worklist.size())
{
@ -241,9 +261,12 @@ struct OptLutWorker
worklist.insert(lutM);
worklist.erase(lutR);
combined_count++;
}
}
}
show_stats_by_arity();
}
};
@ -271,10 +294,16 @@ struct OptLutPass : public Pass {
}
extra_args(args, argidx, design);
int total_count = 0;
for (auto module : design->selected_modules())
{
OptLutWorker worker(module);
total_count += worker.combined_count;
}
if (total_count)
design->scratchpad_set_bool("opt.did_something", true);
log("\n");
log("Combined %d LUTs.\n", total_count);
}
} OptLutPass;