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Drop keep=0 attributes on SB_CARRY

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This commit is contained in:
Eddie Hung 2019-12-06 17:27:47 -08:00
parent a7e0cca480
commit 946d5854c0
2 changed files with 10 additions and 2 deletions
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8
passes/pmgen/ice40_wrapcarry.cc
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@ -51,6 +51,9 @@ void create_ice40_wrapcarry(ice40_wrapcarry_pm &pm)
cell->setParam("\\LUT", st.lut->getParam("\\LUT_INIT"));
cell->attributes = std::move(st.carry->attributes);
auto it = cell->attributes.find(ID::keep);
if (it != cell->attributes.end() && !it->second.as_bool())
cell->attributes.erase(it);
cell->attributes.insert(st.lut->attributes.begin(), st.lut->attributes.end());
pm.autoremove(st.carry);
@ -69,6 +72,11 @@ struct Ice40WrapCarryPass : public Pass {
log("into an internal $__ICE40_CARRY_WRAPPER cell for preservation across technology\n");
log("mapping.");
log("\n");
log("Attributes on both cells will be merged, with SB_CARRY attributes having priority\n");
log("over SB_LUT4 attributes, except when (* keep *) attributes present on the SB_CARRY4\n");
log("that logically evaluate to false will be dropped (thus allowing the keep attribute,\n");
log("if any, on the SB_LUT4 to be adopted).\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{