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Remove $__ICE40_FULL_ADDER handling from ice40_opt; cannot reason with

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CARRY_WRAPPER in the same way since I0 and I3 could be used
This commit is contained in:
Eddie Hung 2019-08-28 17:07:36 -07:00
parent 077e9d4ada
commit 2aedee1f0e
1 changed files with 0 additions and 45 deletions
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45
techlibs/ice40/ice40_opt.cc
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@ -83,51 +83,6 @@ static void run_ice40_opts(Module *module)
} }
continue; continue;
} }
if (cell->type == "$__ICE40_FULL_ADDER")
{
SigSpec non_const_inputs, replacement_output;
int count_zeros = 0, count_ones = 0;
SigBit inbit[3] = {
cell->getPort("\\A"),
cell->getPort("\\B"),
cell->getPort("\\CI")
};
for (int i = 0; i < 3; i++)
if (inbit[i].wire == nullptr) {
if (inbit[i] == State::S1)
count_ones++;
else
count_zeros++;
} else
non_const_inputs.append(inbit[i]);
if (count_zeros >= 2)
replacement_output = State::S0;
else if (count_ones >= 2)
replacement_output = State::S1;
else if (GetSize(non_const_inputs) == 1)
replacement_output = non_const_inputs;
if (GetSize(replacement_output)) {
optimized_co.insert(sigmap(cell->getPort("\\CO")[0]));
module->connect(cell->getPort("\\CO")[0], replacement_output);
module->design->scratchpad_set_bool("opt.did_something", true);
log("Optimized $__ICE40_FULL_ADDER cell back to logic (without SB_CARRY) %s.%s: CO=%s\n",
log_id(module), log_id(cell), log_signal(replacement_output));
cell->type = "$lut";
cell->setPort("\\A", { State::S0, inbit[0], inbit[1], inbit[2] });
cell->setPort("\\Y", cell->getPort("\\O"));
cell->unsetPort("\\B");
cell->unsetPort("\\CI");
cell->unsetPort("\\CO");
cell->unsetPort("\\O");
cell->setParam("\\LUT", RTLIL::Const::from_string("0110100110010110"));
cell->setParam("\\WIDTH", 4);
}
continue;
}
} }
for (auto cell : sb_lut_cells) for (auto cell : sb_lut_cells)