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fhdl.ir: don't crash propagataing ports in empty fragments.

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whitequark 2018-12-13 11:25:49 +00:00
parent 72257b6935
commit b150f1915d
2 changed files with 10 additions and 2 deletions
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4
nmigen/fhdl/ir.py
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@ -131,8 +131,8 @@ class Fragment:
def _propagate_ports(self, ports):
# Collect all signals we're driving (on LHS of statements), and signals we're using
# (on RHS of statements, or in clock domains).
self_driven = union(s._lhs_signals() for s in self.statements)
self_used = union(s._rhs_signals() for s in self.statements)
self_driven = union(s._lhs_signals() for s in self.statements) or ValueSet()
self_used = union(s._rhs_signals() for s in self.statements) or ValueSet()
for domain, _ in self.iter_sync():
cd = self.domains[domain]
self_used.add(cd.clk)