From 4e3d048dfb1a6bd719c55291e36f8c7b91c60fe0 Mon Sep 17 00:00:00 2001
From: Cesar Strauss <cestrauss@gmail.com>
Date: Sun, 4 Jul 2021 18:00:27 -0300
Subject: [PATCH] Beginning of a class to make a parallel test case for
 LDSTCompUnit

For now it just issues an operation. Later it will setup producers and
consumers for input/output operands and the port interface.
---
 .../experiment/test/test_compldst_multi.py    | 42 ++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/src/soc/experiment/test/test_compldst_multi.py b/src/soc/experiment/test/test_compldst_multi.py
index f173714f..1f212514 100644
--- a/src/soc/experiment/test/test_compldst_multi.py
+++ b/src/soc/experiment/test/test_compldst_multi.py
@@ -4,11 +4,50 @@
 import unittest
 from nmigen import Module
 from nmigen.sim import Simulator
+
+from openpower.consts import MSR
+from openpower.decoder.power_enums import MicrOp, LDSTMode
+
 from soc.experiment.compldst_multi import LDSTCompUnit
 from soc.experiment.pimem import PortInterface
 from soc.fu.ldst.pipe_data import LDSTPipeSpec
 
 
+class OpSim:
+    def __init__(self, dut):
+        self.dut = dut
+
+    def issue(self, op, zero_a=False, imm=None, update=False,
+              byterev=True, signext=False,
+              data_len=2, msr_pr=0):
+        dut = self.dut
+        yield dut.oper_i.insn_type.eq(op)
+        yield dut.oper_i.data_len.eq(data_len)
+        yield dut.oper_i.zero_a.eq(zero_a)
+        yield dut.oper_i.byte_reverse.eq(byterev)
+        yield dut.oper_i.sign_extend.eq(signext)
+        if imm is not None:
+            yield dut.oper_i.imm_data.data.eq(imm)
+            yield dut.oper_i.imm_data.ok.eq(1)
+        if update:
+            yield dut.oper_i.ldst_mode.eq(LDSTMode.update)
+        yield dut.oper_i.msr[MSR.PR].eq(msr_pr)
+        yield dut.issue_i.eq(1)
+        yield
+        yield dut.issue_i.eq(0)
+        # deactivate decoder inputs along with issue_i, so we can be sure they
+        # were latched at the correct cycle
+        yield dut.oper_i.insn_type.eq(0)
+        yield dut.oper_i.data_len.eq(0)
+        yield dut.oper_i.zero_a.eq(0)
+        yield dut.oper_i.byte_reverse.eq(0)
+        yield dut.oper_i.sign_extend.eq(0)
+        yield dut.oper_i.imm_data.data.eq(0)
+        yield dut.oper_i.imm_data.ok.eq(0)
+        yield dut.oper_i.ldst_mode.eq(LDSTMode.NONE)
+        yield dut.oper_i.msr[MSR.PR].eq(0)
+
+
 class TestLDSTCompUnit(unittest.TestCase):
 
     def test_ldst_compunit(self):
@@ -19,9 +58,10 @@ class TestLDSTCompUnit(unittest.TestCase):
         m.submodules.dut = dut
         sim = Simulator(m)
         sim.add_clock(1e-6)
+        op = OpSim(dut)
 
         def process():
-            yield
+            yield from op.issue(MicrOp.OP_STORE)
 
         sim.add_sync_process(process)
         sim_writer = sim.write_vcd("test_ldst_compunit.vcd")
-- 
2.30.2