From 32aa7a2fec98631e2bab5790b5cb3296b0f10913 Mon Sep 17 00:00:00 2001 From: whitequark Date: Tue, 22 Jan 2019 17:51:44 +0000 Subject: [PATCH] back.pysim: fix behavior of initial cycle for sync processes. The current behavior was introduced in 65702719, which was a wrong fix for an issue that was actually fixed in 12e04e4e. This commit effectively reverts 65702719 and 1782b841. --- nmigen/back/pysim.py | 6 +++--- nmigen/lib/fifo.py | 2 +- nmigen/test/test_sim.py | 3 --- 3 files changed, 4 insertions(+), 7 deletions(-) diff --git a/nmigen/back/pysim.py b/nmigen/back/pysim.py index a19905d..21885a8 100644 --- a/nmigen/back/pysim.py +++ b/nmigen/back/pysim.py @@ -414,13 +414,13 @@ class Simulator: process = self._check_process(process) def sync_process(): try: - result = None + cmd = None while True: - self._process_loc[sync_process] = self._name_process(process) - cmd = process.send(result) if cmd is None: cmd = Tick(domain) result = yield cmd + self._process_loc[sync_process] = self._name_process(process) + cmd = process.send(result) except StopIteration: pass sync_process = sync_process() diff --git a/nmigen/lib/fifo.py b/nmigen/lib/fifo.py index 6e8e679..e26d3d4 100644 --- a/nmigen/lib/fifo.py +++ b/nmigen/lib/fifo.py @@ -72,9 +72,9 @@ class FIFOInterface: def read(self): """Read method for simulation.""" + assert (yield self.readable) yield self.re.eq(1) yield - assert (yield self.readable) value = (yield self.dout) yield self.re.eq(0) return value diff --git a/nmigen/test/test_sim.py b/nmigen/test/test_sim.py index d1f769e..20f6fa1 100644 --- a/nmigen/test/test_sim.py +++ b/nmigen/test/test_sim.py @@ -279,9 +279,6 @@ class SimulatorIntegrationTestCase(FHDLTestCase): with self.assertSimulation(self.m) as sim: sim.add_clock(1e-6, domain="sync") def process(): - self.assertEqual((yield self.count), 4) - self.assertEqual((yield self.sync.clk), 0) - yield self.assertEqual((yield self.count), 4) self.assertEqual((yield self.sync.clk), 1) yield -- 2.30.2