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

2018-12-14 13:25:51 +00:00 · 2018-12-14 13:25:51 +00:00 · 7fc9f98b98
parent 3ad79ec690
commit 7fc9f98b98
1 changed files with 3 additions and 0 deletions
--- a/nmigen/back/pysim.py
+++ b/nmigen/back/pysim.py
@ -281,6 +281,9 @@ class Simulator:
                    normalize(signal.reset, signal.shape())
                self._state.curr_dirty.add(signal)

+                if not self._vcd_writer:
+                    continue
+
                if signal not in self._vcd_signals:
                    self._vcd_signals[signal] = set()