From: Clifford Wolf Date: Mon, 27 Apr 2015 08:16:07 +0000 (+0200) Subject: Added simplemap $lut support X-Git-Tag: yosys-0.6~303 X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=794d22969dae1a31af36719574351cf75e4fe033;p=yosys.git Added simplemap $lut support --- diff --git a/passes/techmap/simplemap.cc b/passes/techmap/simplemap.cc index 170b7b04f..6cd1c5864 100644 --- a/passes/techmap/simplemap.cc +++ b/passes/techmap/simplemap.cc @@ -283,6 +283,29 @@ void simplemap_mux(RTLIL::Module *module, RTLIL::Cell *cell) } } +void simplemap_lut(RTLIL::Module *module, RTLIL::Cell *cell) +{ + SigSpec lut_ctrl = cell->getPort("\\A"); + SigSpec lut_data = cell->getParam("\\LUT"); + lut_data.extend_u0(1 << cell->getParam("\\WIDTH").as_int()); + + for (int idx = 0; GetSize(lut_data) > 1; idx++) { + SigSpec sig_s = lut_ctrl[idx]; + SigSpec new_lut_data = module->addWire(NEW_ID, GetSize(lut_data)/2); + for (int i = 0; i < GetSize(lut_data); i += 2) { + RTLIL::Cell *gate = module->addCell(NEW_ID, "$_MUX_"); + gate->add_strpool_attribute("\\src", cell->get_strpool_attribute("\\src")); + gate->setPort("\\A", lut_data[i]); + gate->setPort("\\B", lut_data[i+1]); + gate->setPort("\\S", lut_ctrl[idx]); + gate->setPort("\\Y", new_lut_data[i/2]); + } + lut_data = new_lut_data; + } + + module->connect(cell->getPort("\\Y"), lut_data); +} + void simplemap_slice(RTLIL::Module *module, RTLIL::Cell *cell) { int offset = cell->parameters.at("\\OFFSET").as_int(); @@ -458,6 +481,7 @@ void simplemap_get_mappers(std::map