diff options
Diffstat (limited to 'passes')
| -rw-r--r-- | passes/opt/opt_expr.cc | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/passes/opt/opt_expr.cc b/passes/opt/opt_expr.cc index 709cb6020..b7bbb2adf 100644 --- a/passes/opt/opt_expr.cc +++ b/passes/opt/opt_expr.cc @@ -395,9 +395,6 @@ int get_highest_hot_index(RTLIL::SigSpec signal) void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool consume_x, bool mux_undef, bool mux_bool, bool do_fine, bool keepdc, bool noclkinv) { - if (!design->selected(module)) - return; - CellTypes ct_combinational; ct_combinational.setup_internals(); ct_combinational.setup_stdcells(); @@ -2007,6 +2004,23 @@ skip_alu_split: } } +void replace_const_connections(RTLIL::Module *module) { + SigMap assign_map(module); + for (auto cell : module->selected_cells()) + { + std::vector<std::pair<RTLIL::IdString, SigSpec>> changes; + for (auto &conn : cell->connections()) { + SigSpec mapped = assign_map(conn.second); + if (conn.second != mapped && mapped.is_fully_const()) + changes.push_back({conn.first, mapped}); + } + if (!changes.empty()) + did_something = true; + for (auto &it : changes) + cell->setPort(it.first, it.second); + } +} + struct OptExprPass : public Pass { OptExprPass() : Pass("opt_expr", "perform const folding and simple expression rewriting") { } void help() override @@ -2117,6 +2131,11 @@ struct OptExprPass : public Pass { design->scratchpad_set_bool("opt.did_something", true); } while (did_something); + did_something = false; + replace_const_connections(module); + if (did_something) + design->scratchpad_set_bool("opt.did_something", true); + log_suppressed(); } |