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-rw-r--r--passes/pmgen/ice40_wrapcarry.cc75
1 files changed, 67 insertions, 8 deletions
diff --git a/passes/pmgen/ice40_wrapcarry.cc b/passes/pmgen/ice40_wrapcarry.cc
index 69ef3cd82..6e154147f 100644
--- a/passes/pmgen/ice40_wrapcarry.cc
+++ b/passes/pmgen/ice40_wrapcarry.cc
@@ -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;