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Avoid re-arranging signals on register outputs

This commit is contained in:
Clifford Wolf 2013-10-17 20:48:40 +02:00
parent f5c0ed6c79
commit c20571ca5e
1 changed files with 31 additions and 3 deletions
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34
passes/opt/opt_clean.cc
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@ -29,7 +29,7 @@
using RTLIL::id2cstr;
static CellTypes ct;
static CellTypes ct, ct_reg;
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)
static bool compare_signals(RTLIL::SigSpec &s1, RTLIL::SigSpec &s2, SigPool &regs, SigPool &conns)
{
assert(s1.width == 1);
assert(s2.width == 1);
@ -112,6 +112,12 @@ static bool compare_signals(RTLIL::SigSpec &s1, RTLIL::SigSpec &s2)
if (w1->port_input != w2->port_input)
return w2->port_input;
if (regs.check_any(s1) != regs.check_any(s2))
return regs.check_any(s2);
if (conns.check_any(s1) != conns.check_any(s2))
return conns.check_any(s2);
if (w1->port_output != w2->port_output)
return w2->port_output;
@ -137,12 +143,26 @@ static bool check_public_name(RTLIL::IdString id)
static void rmunused_module_signals(RTLIL::Module *module, bool purge_mode, bool verbose)
{
SigPool register_signals;
SigPool connected_signals;
if (!purge_mode)
for (auto &it : module->cells) {
RTLIL::Cell *cell = it.second;
if (ct_reg.cell_known(cell->type))
for (auto &it2 : cell->connections)
if (ct_reg.cell_output(cell->type, it2.first))
register_signals.add(it2.second);
for (auto &it2 : cell->connections)
connected_signals.add(it2.second);
}
SigMap assign_map(module);
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))
if (!compare_signals(s1, s2, register_signals, connected_signals))
assign_map.add(s1);
}
}
@ -289,6 +309,9 @@ struct OptCleanPass : public Pass {
ct.setup_stdcells();
ct.setup_stdcells_mem();
ct_reg.setup_internals_mem();
ct_reg.setup_stdcells_mem();
for (auto &mod_it : design->modules) {
if (!design->selected_whole_module(mod_it.first)) {
if (design->selected(mod_it.second))
@ -303,6 +326,7 @@ struct OptCleanPass : public Pass {
}
ct.clear();
ct_reg.clear();
log_pop();
}
} OptCleanPass;
@ -344,6 +368,9 @@ struct CleanPass : public Pass {
ct.setup_stdcells();
ct.setup_stdcells_mem();
ct_reg.setup_internals_mem();
ct_reg.setup_stdcells_mem();
count_rm_cells = 0;
count_rm_wires = 0;
@ -359,6 +386,7 @@ struct CleanPass : public Pass {
log("Removed %d unused cells and %d unused wires.\n", count_rm_cells, count_rm_wires);
ct.clear();
ct_reg.clear();
}
} CleanPass;