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Diffstat (limited to 'src/main/scala/firrtl/transforms')
| -rw-r--r-- | src/main/scala/firrtl/transforms/ConstantPropagation.scala | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/main/scala/firrtl/transforms/ConstantPropagation.scala b/src/main/scala/firrtl/transforms/ConstantPropagation.scala index 5e9a7850..4a4f41d1 100644 --- a/src/main/scala/firrtl/transforms/ConstantPropagation.scala +++ b/src/main/scala/firrtl/transforms/ConstantPropagation.scala @@ -396,6 +396,9 @@ class ConstantPropagation extends Transform { // Propagate connections to references case Connect(info, lhs, rref @ WRef(rname, _, NodeKind, _)) if !dontTouches.contains(rname) => Connect(info, lhs, nodeMap(rname)) + // If an Attach has at least 1 port, any wires are redundant and can be removed + case Attach(info, exprs) if exprs.exists(kind(_) == PortKind) => + Attach(info, exprs.filterNot(kind(_) == WireKind)) case other => other } } |