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twine

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This commit is contained in:
Emil J. Tywoniak 2026-06-05 12:04:19 +02:00
parent 3d27e83d0f
commit 3424c00cd0
63 changed files with 2635 additions and 503 deletions
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46
techlibs/ice40/ice40_wrapcarry.cc
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@ -62,6 +62,21 @@ void create_ice40_wrapcarry(ice40_wrapcarry_pm &pm)
cell->attributes[stringf("\\SB_CARRY.%s", a.first)] = a.second;
for (const auto &a : st.lut->attributes)
cell->attributes[stringf("\\SB_LUT4.%s", a.first)] = a.second;
// src now lives in src_id_, not the attributes dict — propagate it
// via prefixed flat-literal attributes so the unwrap pass can restore.
if (st.carry->src_id() != Twine::Null)
cell->attributes[IdString("\\SB_CARRY.\\src")] = Const(st.carry->get_src_attribute());
if (st.lut->src_id() != Twine::Null)
cell->attributes[IdString("\\SB_LUT4.\\src")] = Const(st.lut->get_src_attribute());
// Propagate one of the cell-level srcs to the wrapper too so backends
// emitting `attribute \src` see a usable value on the wrapper.
if (cell->module && cell->module->design) {
TwinePool *pool = &cell->module->design->src_twines;
if (st.carry->src_id() != Twine::Null)
cell->set_src_id(pool, st.carry->src_id());
else if (st.lut->src_id() != Twine::Null)
cell->set_src_id(pool, st.lut->src_id());
}
cell->attributes[IdString{"\\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;
@ -134,23 +149,30 @@ struct Ice40WrapCarryPass : public Pass {
lut->setPort(ID::A, { I3, cell->getPort(ID::B), cell->getPort(ID::A), cell->getPort(ID(I0)) });
lut->setPort(ID::Y, cell->getPort(ID::O));
Const src;
for (const auto &a : cell->attributes)
if (a.first.begins_with("\\SB_CARRY.\\"))
std::string carry_src, lut_src, fallback_src;
if (cell->src_id() != Twine::Null)
fallback_src = cell->get_src_attribute();
for (const auto &a : cell->attributes) {
// Match the prefixed src first so we don't fall through
// to the generic SB_CARRY./SB_LUT4. prefix copy.
if (a.first == IdString("\\SB_CARRY.\\src")) {
carry_src = a.second.decode_string();
} else if (a.first == IdString("\\SB_LUT4.\\src")) {
lut_src = a.second.decode_string();
} else 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.\\"))
} 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(IdString{"\\SB_LUT4.name"}, ID::keep, ID::module_not_derived, ID::src))
} else if (a.first.in(IdString{"\\SB_LUT4.name"}, ID::keep, ID::module_not_derived)) {
continue;
else
} else {
log_abort();
if (!src.empty()) {
carry->attributes.insert(std::make_pair(ID::src, src));
lut->attributes.insert(std::make_pair(ID::src, src));
}
}
if (carry_src.empty()) carry_src = fallback_src;
if (lut_src.empty()) lut_src = fallback_src;
if (!carry_src.empty()) carry->set_src_attribute(carry_src);
if (!lut_src.empty()) lut->set_src_attribute(lut_src);
module->remove(cell);
}