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Improved detection of primary wire for a signal in opt_clean

This commit is contained in:
Clifford Wolf 2014-02-07 23:50:17 +01:00
parent 244e8ce1f4
commit 274bcef66c
1 changed files with 23 additions and 4 deletions
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27
passes/opt/opt_clean.cc
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@ -29,7 +29,7 @@
using RTLIL::id2cstr;
static CellTypes ct, ct_reg;
static CellTypes ct, ct_reg, ct_all;
static int count_rm_cells, count_rm_wires;
static void rmunused_module_cells(RTLIL::Module *module, bool verbose)
@ -96,7 +96,7 @@ static void rmunused_module_cells(RTLIL::Module *module, bool verbose)
}
}
static bool compare_signals(RTLIL::SigSpec &s1, RTLIL::SigSpec &s2, SigPool &regs, SigPool &conns)
static bool compare_signals(RTLIL::SigSpec &s1, RTLIL::SigSpec &s2, SigPool &regs, SigPool &conns, std::set<RTLIL::Wire*> &direct_wires)
{
assert(s1.width == 1);
assert(s2.width == 1);
@ -115,6 +115,8 @@ static bool compare_signals(RTLIL::SigSpec &s1, RTLIL::SigSpec &s2, SigPool &reg
if (w1->name[0] == '\\' && w2->name[0] == '\\') {
if (regs.check_any(s1) != regs.check_any(s2))
return regs.check_any(s2);
if (direct_wires.count(w1) != direct_wires.count(w2))
return direct_wires.count(w2);
if (conns.check_any(s1) != conns.check_any(s2))
return conns.check_any(s2);
}
@ -157,13 +159,27 @@ static void rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool
for (auto &it2 : cell->connections)
connected_signals.add(it2.second);
}
SigMap assign_map(module);
std::set<RTLIL::SigSpec> direct_sigs;
std::set<RTLIL::Wire*> direct_wires;
for (auto &it : module->cells) {
RTLIL::Cell *cell = it.second;
if (ct_all.cell_known(cell->type))
for (auto &it2 : cell->connections)
if (ct_all.cell_output(cell->type, it2.first))
direct_sigs.insert(assign_map(it2.second));
}
for (auto &it : module->wires) {
if (direct_sigs.count(assign_map(it.second)) || it.second->port_input)
direct_wires.insert(it.second);
}
for (auto &it : module->wires) {
RTLIL::Wire *wire = it.second;
for (int i = 0; i < wire->width; i++) {
RTLIL::SigSpec s1 = RTLIL::SigSpec(wire, 1, i), s2 = assign_map(s1);
if (!compare_signals(s1, s2, register_signals, connected_signals))
if (!compare_signals(s1, s2, register_signals, connected_signals, direct_wires))
assign_map.add(s1);
}
}
@ -377,6 +393,8 @@ struct CleanPass : public Pass {
ct_reg.setup_internals_mem();
ct_reg.setup_stdcells_mem();
ct_all.setup(design);
count_rm_cells = 0;
count_rm_wires = 0;
@ -393,6 +411,7 @@ struct CleanPass : public Pass {
ct.clear();
ct_reg.clear();
ct_all.clear();
}
} CleanPass;