src/soc/fu/shift_rot/test/test_pipe_caller.py

   1 import random
   2 from soc.fu.shift_rot.pipe_data import ShiftRotPipeSpec
   3 from soc.fu.alu.alu_input_record import CompALUOpSubset
   4 from soc.fu.shift_rot.pipeline import ShiftRotBasePipe
   5 from soc.fu.test.common import TestAccumulatorBase, TestCase, ALUHelpers
   6 from soc.config.endian import bigendian
   7 from soc.decoder.isa.all import ISA
   8 from soc.simulator.program import Program
   9 from soc.decoder.selectable_int import SelectableInt
  10 from soc.decoder.power_enums import (XER_bits, Function, CryIn)
  11 from soc.decoder.power_decoder2 import (PowerDecode2)
  12 from soc.decoder.power_decoder import (create_pdecode)
  13 from soc.decoder.isa.caller import ISACaller, special_sprs
  14 import unittest
  15 from nmigen.cli import rtlil
  16 from nmigen import Module, Signal
  17 from nmigen.back.pysim import Delay, Settle
  18 # NOTE: to use this (set to True), at present it is necessary to check
  19 # out the cxxsim nmigen branch
  20 cxxsim = False
  21 if cxxsim:
  22     try:
  23         from nmigen.sim.cxxsim import Simulator
  24     except ImportError:
  25         print("nope, sorry, have to use nmigen cxxsim branch for now")
  26         cxxsim = False
  27         from nmigen.back.pysim import Simulator
  28 else:
  29     from nmigen.back.pysim import Simulator
  30
  31
  32 def get_cu_inputs(dec2, sim):
  33     """naming (res) must conform to ShiftRotFunctionUnit input regspec
  34     """
  35     res = {}
  36
  37     yield from ALUHelpers.get_sim_int_ra(res, sim, dec2)  # RA
  38     yield from ALUHelpers.get_sim_int_rb(res, sim, dec2)  # RB
  39     yield from ALUHelpers.get_sim_int_rc(res, sim, dec2)  # RC
  40     yield from ALUHelpers.get_rd_sim_xer_ca(res, sim, dec2)  # XER.ca
  41
  42     print("inputs", res)
  43
  44     return res
  45
  46
  47 def set_alu_inputs(alu, dec2, sim):
  48     # TODO: see https://bugs.libre-soc.org/show_bug.cgi?id=305#c43
  49     # detect the immediate here (with m.If(self.i.ctx.op.imm_data.imm_ok))
  50     # and place it into data_i.b
  51
  52     inp = yield from get_cu_inputs(dec2, sim)
  53     yield from ALUHelpers.set_int_ra(alu, dec2, inp)
  54     yield from ALUHelpers.set_int_rb(alu, dec2, inp)
  55     yield from ALUHelpers.set_int_rc(alu, dec2, inp)
  56     yield from ALUHelpers.set_xer_ca(alu, dec2, inp)
  57
  58
  59 # This test bench is a bit different than is usual. Initially when I
  60 # was writing it, I had all of the tests call a function to create a
  61 # device under test and simulator, initialize the dut, run the
  62 # simulation for ~2 cycles, and assert that the dut output what it
  63 # should have. However, this was really slow, since it needed to
  64 # create and tear down the dut and simulator for every test case.
  65
  66 # Now, instead of doing that, every test case in ShiftRotTestCase puts some
  67 # data into the test_data list below, describing the instructions to
  68 # be tested and the initial state. Once all the tests have been run,
  69 # test_data gets passed to TestRunner which then sets up the DUT and
  70 # simulator once, runs all the data through it, and asserts that the
  71 # results match the pseudocode sim at every cycle.
  72
  73 # By doing this, I've reduced the time it takes to run the test suite
  74 # massively. Before, it took around 1 minute on my computer, now it
  75 # takes around 3 seconds
  76
  77
  78 class ShiftRotTestCase(TestAccumulatorBase):
  79
  80     def case_shift(self):
  81         insns = ["slw", "sld", "srw", "srd", "sraw", "srad"]
  82         for i in range(20):
  83             choice = random.choice(insns)
  84             lst = [f"{choice} 3, 1, 2"]
  85             initial_regs = [0] * 32
  86             initial_regs[1] = random.randint(0, (1 << 64)-1)
  87             initial_regs[2] = random.randint(0, 63)
  88             print(initial_regs[1], initial_regs[2])
  89             self.add_case(Program(lst, bigendian), initial_regs)
  90
  91     def case_shift_arith(self):
  92         lst = ["sraw 3, 1, 2"]
  93         initial_regs = [0] * 32
  94         initial_regs[1] = random.randint(0, (1 << 64)-1)
  95         initial_regs[2] = random.randint(0, 63)
  96         print(initial_regs[1], initial_regs[2])
  97         self.add_case(Program(lst, bigendian), initial_regs)
  98
  99     def case_shift_once(self):
 100         lst = ["slw 3, 1, 4",
 101                "slw 3, 1, 2"]
 102         initial_regs = [0] * 32
 103         initial_regs[1] = 0x80000000
 104         initial_regs[2] = 0x40
 105         initial_regs[4] = 0x00
 106         self.add_case(Program(lst, bigendian), initial_regs)
 107
 108     def case_rlwinm(self):
 109         for i in range(10):
 110             mb = random.randint(0, 31)
 111             me = random.randint(0, 31)
 112             sh = random.randint(0, 31)
 113             lst = [f"rlwinm 3, 1, {mb}, {me}, {sh}",
 114                    #f"rlwinm. 3, 1, {mb}, {me}, {sh}"
 115                    ]
 116             initial_regs = [0] * 32
 117             initial_regs[1] = random.randint(0, (1 << 64)-1)
 118             self.add_case(Program(lst, bigendian), initial_regs)
 119
 120     def case_rlwimi(self):
 121         lst = ["rlwimi 3, 1, 5, 20, 6"]
 122         initial_regs = [0] * 32
 123         initial_regs[1] = 0xdeadbeef
 124         initial_regs[3] = 0x12345678
 125         self.add_case(Program(lst, bigendian), initial_regs)
 126
 127     def case_rlwnm(self):
 128         lst = ["rlwnm 3, 1, 2, 20, 6"]
 129         initial_regs = [0] * 32
 130         initial_regs[1] = random.randint(0, (1 << 64)-1)
 131         initial_regs[2] = random.randint(0, 63)
 132         self.add_case(Program(lst, bigendian), initial_regs)
 133
 134     def case_rldicl(self):
 135         lst = ["rldicl 3, 1, 5, 20"]
 136         initial_regs = [0] * 32
 137         initial_regs[1] = random.randint(0, (1 << 64)-1)
 138         self.add_case(Program(lst, bigendian), initial_regs)
 139
 140     def case_rldicr(self):
 141         lst = ["rldicr 3, 1, 5, 20"]
 142         initial_regs = [0] * 32
 143         initial_regs[1] = random.randint(0, (1 << 64)-1)
 144         self.add_case(Program(lst, bigendian), initial_regs)
 145
 146     def case_regression_extswsli(self):
 147         lst = [f"extswsli 3, 1, 34"]
 148         initial_regs = [0] * 32
 149         initial_regs[1] = 0x5678
 150         self.add_case(Program(lst, bigendian), initial_regs)
 151
 152     def case_regression_extswsli_2(self):
 153         lst = [f"extswsli 3, 1, 7"]
 154         initial_regs = [0] * 32
 155         initial_regs[1] = 0x3ffffd7377f19fdd
 156         self.add_case(Program(lst, bigendian), initial_regs)
 157
 158     def case_regression_extswsli_3(self):
 159         lst = [f"extswsli 3, 1, 0"]
 160         initial_regs = [0] * 32
 161         #initial_regs[1] = 0x80000000fb4013e2
 162         #initial_regs[1] = 0xffffffffffffffff
 163         #initial_regs[1] = 0x00000000ffffffff
 164         initial_regs[1] = 0x0000010180122900
 165         #initial_regs[1] = 0x3ffffd73f7f19fdd
 166         self.add_case(Program(lst, bigendian), initial_regs)
 167
 168     def case_extswsli(self):
 169         for i in range(40):
 170             sh = random.randint(0, 63)
 171             lst = [f"extswsli 3, 1, {sh}"]
 172             initial_regs = [0] * 32
 173             initial_regs[1] = random.randint(0, (1 << 64)-1)
 174             self.add_case(Program(lst, bigendian), initial_regs)
 175
 176     def case_rlc(self):
 177         insns = ["rldic", "rldicl", "rldicr"]
 178         for i in range(20):
 179             choice = random.choice(insns)
 180             sh = random.randint(0, 63)
 181             m = random.randint(0, 63)
 182             lst = [f"{choice} 3, 1, {sh}, {m}"]
 183             initial_regs = [0] * 32
 184             initial_regs[1] = random.randint(0, (1 << 64)-1)
 185             self.add_case(Program(lst, bigendian), initial_regs)
 186
 187     def case_ilang(self):
 188         pspec = ShiftRotPipeSpec(id_wid=2)
 189         alu = ShiftRotBasePipe(pspec)
 190         vl = rtlil.convert(alu, ports=alu.ports())
 191         with open("pipeline.il", "w") as f:
 192             f.write(vl)
 193
 194
 195 class TestRunner(unittest.TestCase):
 196     def __init__(self, test_data):
 197         super().__init__("run_all")
 198         self.test_data = test_data
 199
 200     def execute(self, alu, instruction, pdecode2, test):
 201         program = test.program
 202         simulator = ISA(pdecode2, test.regs, test.sprs, test.cr,
 203                         test.mem, test.msr,
 204                         bigendian=bigendian)
 205         gen = program.generate_instructions()
 206         instructions = list(zip(gen, program.assembly.splitlines()))
 207
 208         index = simulator.pc.CIA.value//4
 209         while index < len(instructions):
 210             ins, code = instructions[index]
 211
 212             print("0x{:X}".format(ins & 0xffffffff))
 213             print(code)
 214
 215             # ask the decoder to decode this binary data (endian'd)
 216             yield pdecode2.dec.bigendian.eq(bigendian)  # little / big?
 217             yield instruction.eq(ins)          # raw binary instr.
 218             yield Settle()
 219             fn_unit = yield pdecode2.e.do.fn_unit
 220             self.assertEqual(fn_unit, Function.SHIFT_ROT.value)
 221             yield from set_alu_inputs(alu, pdecode2, simulator)
 222             yield
 223             opname = code.split(' ')[0]
 224             yield from simulator.call(opname)
 225             index = simulator.pc.CIA.value//4
 226
 227             vld = yield alu.n.valid_o
 228             while not vld:
 229                 yield
 230                 vld = yield alu.n.valid_o
 231             yield
 232             alu_out = yield alu.n.data_o.o.data
 233
 234             yield from self.check_alu_outputs(alu, pdecode2,
 235                                               simulator, code)
 236
 237     def run_all(self):
 238         m = Module()
 239         comb = m.d.comb
 240         instruction = Signal(32)
 241
 242         pdecode = create_pdecode()
 243
 244         m.submodules.pdecode2 = pdecode2 = PowerDecode2(pdecode)
 245
 246         pspec = ShiftRotPipeSpec(id_wid=2)
 247         m.submodules.alu = alu = ShiftRotBasePipe(pspec)
 248
 249         comb += alu.p.data_i.ctx.op.eq_from_execute1(pdecode2.e)
 250         comb += alu.p.valid_i.eq(1)
 251         comb += alu.n.ready_i.eq(1)
 252         comb += pdecode2.dec.raw_opcode_in.eq(instruction)
 253         sim = Simulator(m)
 254
 255         sim.add_clock(1e-6)
 256
 257         def process():
 258             for test in self.test_data:
 259                 print(test.name)
 260                 program = test.program
 261                 with self.subTest(test.name):
 262                     yield from self.execute(alu, instruction, pdecode2, test)
 263
 264         sim.add_sync_process(process)
 265         print(dir(sim))
 266         if cxxsim:
 267             sim.run()
 268         else:
 269             with sim.write_vcd("simulator.vcd", "simulator.gtkw",
 270                                traces=[]):
 271                 sim.run()
 272
 273     def check_alu_outputs(self, alu, dec2, sim, code):
 274
 275         rc = yield dec2.e.do.rc.data
 276         cridx_ok = yield dec2.e.write_cr.ok
 277         cridx = yield dec2.e.write_cr.data
 278
 279         print("check extra output", repr(code), cridx_ok, cridx)
 280         if rc:
 281             self.assertEqual(cridx, 0, code)
 282
 283         sim_o = {}
 284         res = {}
 285
 286         yield from ALUHelpers.get_cr_a(res, alu, dec2)
 287         yield from ALUHelpers.get_xer_ca(res, alu, dec2)
 288         yield from ALUHelpers.get_int_o(res, alu, dec2)
 289
 290         yield from ALUHelpers.get_sim_int_o(sim_o, sim, dec2)
 291         yield from ALUHelpers.get_wr_sim_cr_a(sim_o, sim, dec2)
 292         yield from ALUHelpers.get_wr_sim_xer_ca(sim_o, sim, dec2)
 293
 294         ALUHelpers.check_cr_a(self, res, sim_o, "CR%d %s" % (cridx, code))
 295         ALUHelpers.check_xer_ca(self, res, sim_o, code)
 296         ALUHelpers.check_int_o(self, res, sim_o, code)
 297
 298
 299 if __name__ == "__main__":
 300     unittest.main(exit=False)
 301     suite = unittest.TestSuite()
 302     suite.addTest(TestRunner(ShiftRotTestCase().test_data))
 303
 304     runner = unittest.TextTestRunner()
 305     runner.run(suite)