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back.pysim: skip VCD signal population if VCD is not requested.

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whitequark 2018-12-14 13:25:51 +00:00
parent 3ad79ec690
commit 7fc9f98b98
1 changed files with 3 additions and 0 deletions
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3
nmigen/back/pysim.py
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@ -281,6 +281,9 @@ class Simulator:
normalize(signal.reset, signal.shape()) normalize(signal.reset, signal.shape())
self._state.curr_dirty.add(signal) self._state.curr_dirty.add(signal)
if not self._vcd_writer:
continue
if signal not in self._vcd_signals: if signal not in self._vcd_signals:
self._vcd_signals[signal] = set() self._vcd_signals[signal] = set()