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Merge pull request #1545 from YosysHQ/eddie/ice40_wrapcarry_attr

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Preserve SB_CARRY name and attributes when using $__ICE40_CARRY_WRAPPER
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Eddie Hung 2019-12-09 17:38:48 -08:00 • committed by GitHub
commit 7e5602ad17
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8 changed files with 225 additions and 51 deletions
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75
passes/pmgen/ice40_wrapcarry.cc
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@ -50,6 +50,14 @@ void create_ice40_wrapcarry(ice40_wrapcarry_pm &pm)
cell->setPort("\\O", st.lut->getPort("\\O"));
cell->setParam("\\LUT", st.lut->getParam("\\LUT_INIT"));
for (const auto &a : st.carry->attributes)
cell->attributes[stringf("\\SB_CARRY.%s", a.first.c_str())] = a.second;
for (const auto &a : st.lut->attributes)
cell->attributes[stringf("\\SB_LUT4.%s", a.first.c_str())] = a.second;
cell->attributes[ID(SB_LUT4.name)] = Const(st.lut->name.str());
if (st.carry->get_bool_attribute(ID::keep) || st.lut->get_bool_attribute(ID::keep))
cell->attributes[ID::keep] = true;
pm.autoremove(st.carry);
pm.autoremove(st.lut);
}
@ -62,28 +70,79 @@ struct Ice40WrapCarryPass : public Pass {
log("\n");
log(" ice40_wrapcarry [selection]\n");
log("\n");
log("Wrap manually instantiated SB_CARRY cells, along with their associated SB_LUTs,\n");
log("Wrap manually instantiated SB_CARRY cells, along with their associated SB_LUT4s,\n");
log("into an internal $__ICE40_CARRY_WRAPPER cell for preservation across technology\n");
log("mapping.");
log("mapping.\n");
log("\n");
log("Attributes on both cells will have their names prefixed with 'SB_CARRY.' or\n");
log("'SB_LUT4.' and attached to the wrapping cell.\n");
log("A (* keep *) attribute on either cell will be logically OR-ed together.\n");
log("\n");
log(" -unwrap\n");
log(" unwrap $__ICE40_CARRY_WRAPPER cells back into SB_CARRYs and SB_LUT4s,\n");
log(" including restoring their attributes.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
bool unwrap = false;
log_header(design, "Executing ICE40_WRAPCARRY pass (wrap carries).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
// if (args[argidx] == "-singleton") {
// singleton_mode = true;
// continue;
// }
if (args[argidx] == "-unwrap") {
unwrap = true;
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
ice40_wrapcarry_pm(module, module->selected_cells()).run_ice40_wrapcarry(create_ice40_wrapcarry);
for (auto module : design->selected_modules()) {
if (!unwrap)
ice40_wrapcarry_pm(module, module->selected_cells()).run_ice40_wrapcarry(create_ice40_wrapcarry);
else {
for (auto cell : module->selected_cells()) {
if (cell->type != ID($__ICE40_CARRY_WRAPPER))
continue;
auto carry = module->addCell(NEW_ID, ID(SB_CARRY));
carry->setPort(ID(I0), cell->getPort(ID(A)));
carry->setPort(ID(I1), cell->getPort(ID(B)));
carry->setPort(ID(CI), cell->getPort(ID(CI)));
carry->setPort(ID(CO), cell->getPort(ID(CO)));
module->swap_names(carry, cell);
auto lut_name = cell->attributes.at(ID(SB_LUT4.name), Const(NEW_ID.str())).decode_string();
auto lut = module->addCell(lut_name, ID($lut));
lut->setParam(ID(WIDTH), 4);
lut->setParam(ID(LUT), cell->getParam(ID(LUT)));
lut->setPort(ID(A), {cell->getPort(ID(I0)), cell->getPort(ID(A)), cell->getPort(ID(B)), cell->getPort(ID(I3)) });
lut->setPort(ID(Y), cell->getPort(ID(O)));
Const src;
for (const auto &a : cell->attributes)
if (a.first.begins_with("\\SB_CARRY.\\"))
carry->attributes[a.first.c_str() + strlen("\\SB_CARRY.")] = a.second;
else if (a.first.begins_with("\\SB_LUT4.\\"))
lut->attributes[a.first.c_str() + strlen("\\SB_LUT4.")] = a.second;
else if (a.first == ID(src))
src = a.second;
else if (a.first.in(ID(SB_LUT4.name), ID::keep, ID(module_not_derived)))
continue;
else
log_abort();
if (!src.empty()) {
carry->attributes.insert(std::make_pair(ID(src), src));
lut->attributes.insert(std::make_pair(ID(src), src));
}
module->remove(cell);
}
}
}
}
} Ice40WrapCarryPass;