From d95ffd6fa379e019320523c877c36a02e64c665b Mon Sep 17 00:00:00 2001
From: whitequark <cz@m-labs.hk>
Date: Tue, 18 Dec 2018 04:43:04 +0000
Subject: [PATCH] back.pysim: fix an off-by-1 in add_sync_process().

---
 nmigen/back/pysim.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/nmigen/back/pysim.py b/nmigen/back/pysim.py
index 65357bf..5a6b5ad 100644
--- a/nmigen/back/pysim.py
+++ b/nmigen/back/pysim.py
@@ -342,10 +342,11 @@ class Simulator:
             try:
                 result = None
                 while True:
+                    self._process_loc[sync_process] = self._name_process(process)
+                    result = process.send(result)
                     if result is None:
                         result = Tick(domain)
-                    self._process_loc[sync_process] = self._name_process(process)
-                    result = process.send((yield result))
+                    result = yield result
             except StopIteration:
                 pass
         sync_process = sync_process()
-- 
2.30.2