diff options
Diffstat (limited to 'passes/opt/opt_lut_ins.cc')
| -rw-r--r-- | passes/opt/opt_lut_ins.cc | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/passes/opt/opt_lut_ins.cc b/passes/opt/opt_lut_ins.cc index 99043ef7e..2f7c392b2 100644 --- a/passes/opt/opt_lut_ins.cc +++ b/passes/opt/opt_lut_ins.cc @@ -193,6 +193,12 @@ struct OptLutInsPass : public Pass { swz += extra; } } + if (techname == "gowin") { + // Pad the LUT to 1 input, adding consts from the front. + if (new_inputs.empty()) { + new_inputs.insert(new_inputs.begin(), State::S0); + } + } Const new_lut(0, 1 << GetSize(new_inputs)); for (int i = 0; i < GetSize(new_lut); i++) { int lidx = 0; @@ -209,9 +215,9 @@ struct OptLutInsPass : public Pass { } new_lut[i] = lut[lidx]; } - // For ecp5, do not replace with a const driver — the nextpnr + // For ecp5, and gowin do not replace with a const driver — the nextpnr // packer requires a complete set of LUTs for wide LUT muxes. - if (new_inputs.empty() && techname != "ecp5") { + if (new_inputs.empty() && techname != "ecp5" && techname != "gowin") { // const driver. remove_cells.push_back(cell); module->connect(output, new_lut[0]); |