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Merge pull request #4691 from hovind/experiments/extract-fa-fix

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extract_fa: Fix `xor3`/`xnor3` inversion bug
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Martin Povišer 2025-02-06 21:12:32 +01:00 • committed by GitHub
commit 772b9c0cfd
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2 changed files with 32 additions and 2 deletions
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5
passes/techmap/extract_fa.cc
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@ -412,14 +412,15 @@ struct ExtractFaWorker
facache[fakey] = make_tuple(X, Y, cell);
}
bool invert_y = f3i.inv_a ^ f3i.inv_b ^ f3i.inv_c;
if (func3.at(key).count(xor3_func)) {
SigBit YY = invert_xy ? module->NotGate(NEW_ID, Y) : Y;
SigBit YY = invert_xy ^ invert_y ? module->NotGate(NEW_ID, Y) : Y;
for (auto bit : func3.at(key).at(xor3_func))
assign_new_driver(bit, YY);
}
if (func3.at(key).count(xnor3_func)) {
SigBit YY = invert_xy ? Y : module->NotGate(NEW_ID, Y);
SigBit YY = invert_xy ^ invert_y ? Y : module->NotGate(NEW_ID, Y);
for (auto bit : func3.at(key).at(xnor3_func))
assign_new_driver(bit, YY);
}