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ice40_wrapcarry -unwrap to preserve 'src' attribute

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This commit is contained in:
Eddie Hung 2019-12-09 14:28:54 -08:00
parent eff858cd33
commit 36a88be609
1 changed files with 9 additions and 1 deletions
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10
passes/pmgen/ice40_wrapcarry.cc
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@ -121,16 +121,24 @@ struct Ice40WrapCarryPass : public Pass {
lut->setPort(ID(A), {cell->getPort(ID(I0)), cell->getPort(ID(A)), cell->getPort(ID(B)), cell->getPort(ID(I3)) }); 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))); lut->setPort(ID(Y), cell->getPort(ID(O)));
Const src;
for (const auto &a : cell->attributes) for (const auto &a : cell->attributes)
if (a.first.begins_with("\\SB_CARRY.\\")) if (a.first.begins_with("\\SB_CARRY.\\"))
carry->attributes[a.first.c_str() + strlen("\\SB_CARRY.")] = a.second; 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; lut->attributes[a.first.c_str() + strlen("\\SB_LUT4.")] = a.second;
else if (a.first.in(ID(SB_LUT4.name), ID::keep, ID(module_not_derived), ID(src))) 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; continue;
else else
log_abort(); 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); module->remove(cell);
} }
} }