diff options
| -rw-r--r-- | ecp5/pack.cc | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/ecp5/pack.cc b/ecp5/pack.cc index 1900eded..c0427d46 100644 --- a/ecp5/pack.cc +++ b/ecp5/pack.cc @@ -359,6 +359,32 @@ class Ecp5Packer flush_cells(); } + void set_lut_input_constant(CellInfo *cell, IdString input, bool value) + { + int index = std::string("ABCD").find(input.str(ctx)); + int init = int_or_default(cell->params, ctx->id("INIT")); + int new_init = 0; + for (int i = 0; i < 16; i++) { + if (((i >> index) & 0x1) != value) { + int other_i = (i & (~(1 << index))) | (value << index); + if ((init >> other_i) & 0x1) + new_init |= (1 << i); + } else { + if ((init >> i) & 0x1) + new_init |= (1 << i); + } + } + cell->params[ctx->id("INIT")] = std::to_string(init); + NetInfo *innet = cell->ports.at(input).net; + if (innet != nullptr) { + innet->users.erase( + std::remove_if(innet->users.begin(), innet->users.end(), + [cell, input](PortRef port) { return port.cell == cell && port.port == input; }), + innet->users.end()); + } + cell->ports.at(input).net = nullptr; + } + public: void pack() { |