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check: Limit detailed cell edge checking for $pmux and $bmux

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While these cells can't have a quadratic number of edges between A, B
and Y, they do have a quadratic number of edges between S and Y.
This commit is contained in:
Jannis Harder 2025-08-12 14:38:20 +02:00
parent fb024c4d55
commit 256aa3e389
1 changed files with 13 additions and 6 deletions
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9
passes/cmds/check.cc
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@ -195,17 +195,24 @@ struct CheckPass : public Pass {
// in port widths are those for us to check.
if (!cell->type.in(
ID($add), ID($sub),
ID($shl), ID($shr), ID($sshl), ID($sshr), ID($shift), ID($shiftx)))
ID($shl), ID($shr), ID($sshl), ID($sshr), ID($shift), ID($shiftx),
ID($pmux), ID($bmux)))
return false;
int in_widths = 0, out_widths = 0;
if (cell->type.in(ID($pmux), ID($bmux))) {
// We're skipping inputs A and B, since each of their bits contributes only one edge
in_widths = GetSize(cell->getPort(ID::S));
out_widths = GetSize(cell->getPort(ID::Y));
} else {
for (auto &conn : cell->connections()) {
if (cell->input(conn.first))
in_widths += conn.second.size();
if (cell->output(conn.first))
out_widths += conn.second.size();
}
}
const int threshold = 1024;