// -*- mode: C++; c-file-style: "cc-mode" -*-
//*************************************************************************
//
// Copyright 2012 by Wilson Snyder. This program is free software; you
// can redistribute it and/or modify it under the terms of either the GNU
// Lesser General Public License Version 3 or the Perl Artistic License
// Version 2.0.
// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
//
// Contributed by Jeremy Bennett and Jie Xu
//
//*************************************************************************

#include <iostream>
#include <iomanip>

#include "svdpi.h"

#include "Vt_dpi_accessors.h"
#include "Vt_dpi_accessors__Dpi.h"

using std::cout;
using std::dec;
using std::endl;
using std::hex;
using std::setfill;
using std::setw;

// Convenience function to check we didn't finish unexpectedly
static void checkFinish(const char* msg) {
    if (Verilated::gotFinish()) {
        vl_fatal(__FILE__, __LINE__, "dut", msg);
        exit(1);
    }
}

// Convenience function to log the value of a register in hex. Only in verbose
// mode.
static void logReg(int clk, const char* desc, int val, const char* note) {
#ifdef TEST_VERBOSE
    cout << "clk = " << clk << ", " << desc << " = " << val << note << endl;
#endif
}

// Convenience function to log the value of a register in hex. Only in verbose
// mode.
static void logRegHex(int clk, const char* desc, int bitWidth, int val, const char* note) {
#ifdef TEST_VERBOSE
    cout << "clk = " << clk << ", " << desc << " = " << bitWidth << "\'h" << hex
         << setw((bitWidth - 1) / 4 + 1) << setfill('0') << val << setfill(' ') << setw(0) << dec
         << note << endl;
#endif
}

// Convenience function to check we got an expected result. Silent on success.
static void checkResult(bool p, const char* msg_fail) {
    if (!p) { vl_fatal(__FILE__, __LINE__, "dut", msg_fail); }
}

// Main function instantiates the model and steps through the test.
int main() {
    Vt_dpi_accessors* dut = new Vt_dpi_accessors("dut");
    svScope scope = svGetScopeFromName("dut.t");
    if (!scope) vl_fatal(__FILE__, __LINE__, "dut", "No svGetScopeFromName result");
    svSetScope(scope);

    // evaluate the model with no signal changes to get the initial blocks
    // executed.
    dut->eval();

#ifdef TEST_VERBOSE
    cout << "Initial DPI values" << endl;
    cout << "==================" << endl;
#endif

    int a = (int)a_read();
    int b = (int)b_read();
    int mem32 = (int)mem32_read();
    int c = (int)c_read();
    int d = (int)d_read();
    int e = (int)e_read();
    int f = (int)f_read();

#ifdef TEST_VERBOSE
    cout << "Read  a     = " << a << endl;
    cout << "Read  b     = 8'h" << hex << setw(2) << setfill('0') << b << setfill(' ') << setw(0)
         << dec << endl;
    cout << "Read  mem32 = 8'h" << hex << setw(2) << setfill('0') << mem32 << setfill(' ')
         << setw(0) << dec << endl;
    cout << "Read  c     = " << c << endl;
    cout << "Read  d     = 8'h" << hex << setw(2) << setfill('0') << d << setfill(' ') << setw(0)
         << dec << endl;
    cout << "Read  e     = 8'h" << hex << setw(2) << setfill('0') << e << setfill(' ') << setw(0)
         << dec << endl;
    cout << "Read  f     = 8'h" << hex << setw(2) << setfill('0') << f << setfill(' ') << setw(0)
         << dec << endl;
    cout << endl;
#endif

    checkResult((0 == a) && (0x00 == b) && (0x20 == mem32) && (1 == c) && (0xff == d)
                    && (0x00 == e) && (0x00 == f),
                "Bad initial DPI values.");

    // Initialize the clock
    dut->clk = 0;

    // Check we can read a scalar register.
#ifdef TEST_VERBOSE
    cout << "Test of scalar register reading" << endl;
    cout << "===============================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        a = (int)a_read();
        logReg(dut->clk, "read a", a, " (before clk)");
        dut->eval();

        int a_after = (int)a_read();
        logReg(dut->clk, "read a", a_after, " (after clk)");
#ifdef TEST_VERBOSE
        cout << endl;
#endif
        // On a posedge, a should toggle, on a negedge it should stay the
        // same.
        checkResult(((dut->clk == 1) && (a_after == (1 - a)))
                        || ((dut->clk == 0) && (a_after == a)),
                    "Test of scalar register reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can read a vector register.
#ifdef TEST_VERBOSE
    cout << "Test of vector register reading" << endl;
    cout << "===============================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        b = (int)b_read();
        logRegHex(dut->clk, "read b", 8, b, " (before clk)");

        dut->eval();

        int b_after = (int)b_read();
        logRegHex(dut->clk, "read b", 8, b_after, " (after clk)");
        // b should increment on a posedge and stay the same on a negedge.
        checkResult(((dut->clk == 1) && (b_after == (b + 1)))
                        || ((dut->clk == 0) && (b_after == b)),
                    "Test of vector register reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Test we can read an array element
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of array element reading" << endl;
    cout << "=============================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        mem32 = (int)mem32_read();
        logRegHex(dut->clk, "read mem32", 8, mem32, " (before clk)");

        dut->eval();

        mem32 = (int)mem32_read();
        logRegHex(dut->clk, "read mem32", 8, mem32, " (after clk)");

        // In this case, the value never changes. But we should check it is
        // waht we expect (0x20).
        checkResult(mem32 == 0x20, "Test of array element reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can read a scalar wire
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of scalar wire reading" << endl;
    cout << "===========================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        a = (int)a_read();
        c = (int)c_read();
        logReg(dut->clk, "read a", a, " (before clk)");
        logReg(dut->clk, "read c", c, " (before clk)");

        dut->eval();

        a = (int)a_read();
        c = (int)c_read();
        logReg(dut->clk, "read a", a, " (after clk)");
        logReg(dut->clk, "read c", c, " (after clk)");
        // "c" is continuously assigned as the inverse of "a", but in
        // Verilator, that means that it will only change value when "a"
        // changes on the posedge of a clock. Put simply, "c" always holds the
        // inverse of the "after clock" value of "a".
        checkResult(c == (1 - a), "Test of scalar wire reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can read a vector wire
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of vector wire reading" << endl;
    cout << "===========================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        b = (int)b_read();
        d = (int)d_read();
        logRegHex(dut->clk, "read b", 8, b, " (before clk)");
        logRegHex(dut->clk, "read d", 8, d, " (before clk)");

        dut->eval();

        b = (int)b_read();
        d = (int)d_read();
        logRegHex(dut->clk, "read b", 8, b, " (after clk)");
        logRegHex(dut->clk, "read d", 8, d, " (after clk)");

        // "d" is continuously assigned as the (8-bit) bitwise inverse of "b",
        // but in Verilator, that means that it will only change value when
        // "b" changes on the posedge of a clock. Put simply, "d" always holds
        // the inverse of the "after clock" value of "b".
        checkResult(d == ((~b) & 0xff), "Test of vector wire reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can write a scalar register
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of scalar register writing" << endl;
    cout << "===============================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        a = 1 - (int)a_read();
        a_write(reinterpret_cast<const svBitVecVal*>(&a));
        logReg(dut->clk, "write a", a, " (before clk)");
        a = a_read();
        logReg(dut->clk, "read  a", a, " (before clk)");

        dut->eval();

        int a_after = (int)a_read();
        logReg(dut->clk, "read  a", a_after, " (after clk)");

        // On a posedge clock, the value of a that is written should toggle,
        // on a negedge, it should not.
        checkResult(((dut->clk == 1) && (a_after == (1 - a)))
                        || ((dut->clk == 0) && (a_after == a)),
                    "Test of scalar register writing failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can write a vector register
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of vector register writing" << endl;
    cout << "===============================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        b = (int)b_read() - 1;
        b_write(reinterpret_cast<const svBitVecVal*>(&b));
        logRegHex(dut->clk, "write b", 8, b, " (before clk)");
        b = (int)b_read();
        logRegHex(dut->clk, "read  b", 8, b, " (before clk)");

        dut->eval();

        int b_after = (int)b_read();
        logRegHex(dut->clk, "read  b", 8, b_after, " (after clk)");

        // The value of "b" written should increment on a posedge and stay the
        // same on a negedge.
        checkResult(((dut->clk == 1) && (b_after == (b + 1)))
                        || ((dut->clk == 0) && (b_after == b)),
                    "Test of vector register writing failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Test we can write an array element
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of array element writing" << endl;
    cout << "=============================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        mem32 = (int)mem32_read() - 1;
        mem32_write(reinterpret_cast<const svBitVecVal*>(&mem32));
        logRegHex(dut->clk, "write mem32", 8, mem32, " (before clk)");
        mem32 = (int)mem32_read();
        logRegHex(dut->clk, "read  mem32", 8, mem32, " (before clk)");

        dut->eval();

        int mem32_after = (int)mem32_read();
        logRegHex(dut->clk, "read  mem32", 8, mem32_after, " (after clk)");

        // In this case, the value we write never changes (this would only
        // happen if this part of the test coincided with the 32nd element
        // being overwritten, which it does not. Check that the value after
        // the clock is the same as before the clock.
        checkResult(mem32_after == mem32, "Test of array element writing failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can read a vector register slice
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of vector register slice reading" << endl;
    cout << "=====================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        b = (int)b_read();
        int b_slice = (int)b_slice_read();
        logRegHex(dut->clk, "read b [7:0]", 8, b, " (before clk)");
        logRegHex(dut->clk, "read b [3:0]", 4, b_slice, " (before clk)");

        dut->eval();

        b = (int)b_read();
        b_slice = (int)b_slice_read();
        logRegHex(dut->clk, "read b [7:0]", 8, b, " (after clk)");
        logRegHex(dut->clk, "read b [3:0]", 4, b_slice, " (after clk)");

        // The slice of "b" should always be the bottom 4 bits of "b"
        checkResult(b_slice == (b & 0x0f), "Test of vector register slice reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Test we can read an array element slice
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of array element slice reading" << endl;
    cout << "===================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        mem32 = (int)mem32_read();
        int mem32_slice = (int)mem32_slice_read();
        logRegHex(dut->clk, "read mem32 [7:0]    ", 8, mem32, " (before clk)");
        logRegHex(dut->clk, "read mem32 [7:6,2:0]", 5, mem32_slice, " (before clk)");

        dut->eval();

        mem32 = (int)mem32_read();
        mem32_slice = (int)mem32_slice_read();
        logRegHex(dut->clk, "read mem32 [7:0]    ", 8, mem32, " (after clk)");
        logRegHex(dut->clk, "read mem32 [7:6,2:0]", 5, mem32_slice, " (after clk)");

        // The slice of "mem32" should always be the concatenation of the top
        // 2 and bottom 3 bits of "mem32"
        checkResult(mem32_slice == (((mem32 & 0xc0) >> 3) | (mem32 & 0x07)),
                    "Test of array element slice reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can read a vector wire slice
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of vector wire slice reading" << endl;
    cout << "=================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;
        b = (int)b_read();
        d = (int)d_read();
        int d_slice = (int)d_slice_read();
        logRegHex(dut->clk, "read b [7:0]", 8, b, " (before clk)");
        logRegHex(dut->clk, "read d [7:0]", 8, d, " (before clk)");
        logRegHex(dut->clk, "read d [6:1]", 6, d_slice, " (before clk)");

        dut->eval();

        b = (int)b_read();
        d = (int)d_read();
        d_slice = (int)d_slice_read();
        logRegHex(dut->clk, "read b [7:0]", 8, b, " (after clk)");
        logRegHex(dut->clk, "read d [7:0]", 8, d, " (after clk)");
        logRegHex(dut->clk, "read d [6:1]", 6, d_slice, " (after clk)");

        // The slice of "d" should always be the middle 6 bits of "d".
        checkResult(d_slice == ((d & 0x7e) >> 1), "Test of vector wire slice reading failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can write a vector register slice
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of vector register slice writing" << endl;
    cout << "=====================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;

        b = (int)b_read();
        int b_slice = (int)b_slice_read();
        logRegHex(dut->clk, "read  b [7:0]", 8, b, " (before write)");
        logRegHex(dut->clk, "read  b [3:0]", 4, b_slice, " (before write)");

        b_slice--;
        b_slice_write(reinterpret_cast<const svBitVecVal*>(&b_slice));
        logRegHex(dut->clk, "write b [3:0]", 4, b_slice, " (before clk)");

        int b_after = (int)b_read();
        int b_slice_after = (int)b_slice_read();
        logRegHex(dut->clk, "read  b [7:0]", 8, b_after, " (before clk)");
        logRegHex(dut->clk, "read  b [3:0]", 4, b_slice_after, " (before clk)");

        // We must test that when we wrote the slice of "b", we only wrote the
        // correct bits. The slice of b is b[3:0]
        int b_new = (b & 0xf0) | (b_slice & 0x0f);
        checkResult(b_after == b_new, "Test of vector register slice writing failed.");

        dut->eval();

        b = (int)b_read();
        b_slice = (int)b_slice_read();
        logRegHex(dut->clk, "read  b [7:0]", 8, b, " (after clk)");
        logRegHex(dut->clk, "read  b [3:0]", 4, b_slice, " (after clk)");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Test we can write an array element slice
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of array element slice writing" << endl;
    cout << "===================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;

        mem32 = (int)mem32_read();
        int mem32_slice = (int)mem32_slice_read();
        logRegHex(dut->clk, "read  mem32 [7:0]    ", 8, mem32, " (before write)");
        logRegHex(dut->clk, "read  mem32 [7:6,2:0]", 5, mem32_slice, " (before write)");

        mem32_slice--;
        mem32_slice_write(reinterpret_cast<const svBitVecVal*>(&mem32_slice));
        logRegHex(dut->clk, "write mem32 [7:6,2:0]", 5, mem32_slice, " (before clk)");

        int mem32_after = (int)mem32_read();
        int mem32_slice_after = (int)mem32_slice_read();
        logRegHex(dut->clk, "read  mem32 [7:0]    ", 8, mem32_after, " (before clk)");
        logRegHex(dut->clk, "read  mem32 [7:6,2:0]", 5, mem32_slice_after, " (before clk)");

        // We must test that when we wrote the slice of "mem32", we only wrote
        // the correct bits. The slice of "mem32" is {mem32[7:6], mem32[2:0]}.
        int mem32_new = (mem32 & 0x38) | ((mem32_slice & 0x18) << 3) | (mem32_slice & 0x7);
        checkResult(mem32_after == mem32_new, "Test of vector register slice writing failed.");

        dut->eval();

        mem32 = (int)mem32_read();
        mem32_slice = (int)mem32_slice_read();
        logRegHex(dut->clk, "read  mem32 [7:0]    ", 8, mem32, " (after clk)");
        logRegHex(dut->clk, "read  mem32 [7:6,2:0]", 5, mem32_slice, " (after clk)");

        // We have already tested that array element writing works, so we just
        // check that dhe slice of "mem32" after the clock is the
        // concatenation of the top 2 and bottom 3 bits of "mem32"
        checkResult(mem32_slice == (((mem32 & 0xc0) >> 3) | (mem32 & 0x07)),
                    "Test of array element slice writing failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Check we can read complex registers
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of complex register reading" << endl;
    cout << "================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;

        b = (int)b_read();
        mem32 = (int)mem32_read();
        e = (int)e_read();
        int l1 = (int)l1_read();
        logRegHex(dut->clk, "read b    ", 8, b, " (before clk)");
        logRegHex(dut->clk, "read mem32", 8, mem32, " (before clk)");
        logRegHex(dut->clk, "read e    ", 8, e, " (before clk)");
        logRegHex(dut->clk, "read l1   ", 15, l1, " (before clk)");

        dut->eval();

        b = (int)b_read();
        mem32 = (int)mem32_read();
        e = (int)e_read();
        l1 = (int)l1_read();
        logRegHex(dut->clk, "read b    ", 8, b, " (after clk)");
        logRegHex(dut->clk, "read mem32", 8, mem32, " (after clk)");
        logRegHex(dut->clk, "read e    ", 8, e, " (after clk)");
        logRegHex(dut->clk, "read l1   ", 15, l1, " (after clk)");

        // We have already tested that reading of registers, memory elements
        // and wires works. So we just need to check that l1 reads back as the
        // correct combination of bits after the clock. It should be the 15
        // bits: {b[3:0],mem[32][7:6],e[6:1],mem[32][2:0]}.
        checkResult(l1
                        == ((((b & 0x0f) >> 0) << 11) | (((mem32 & 0xc0) >> 6) << 9)
                            | (((e & 0x7e) >> 1) << 3) | (((mem32 & 0x07) >> 0) << 0)),
                    "Test of complex register reading l1 failed.");
    }

#ifdef TEST_VERBOSE
    cout << endl;
#endif

    checkFinish("t_dpi_accessors unexpected finish");

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;

        e = 0x05 | (i << 4);
        f = 0xa0 | i;
        e_write(reinterpret_cast<const svBitVecVal*>(&e));
        f_write(reinterpret_cast<const svBitVecVal*>(&f));

        e = (int)e_read();
        f = (int)f_read();
        int l2 = (int)l2_read();
        logRegHex(dut->clk, "read e ", 8, e, " (before clk)");
        logRegHex(dut->clk, "read f ", 8, f, " (before clk)");
        logRegHex(dut->clk, "read l2", 8, l2, " (before clk)");

        dut->eval();

        e = (int)e_read();
        f = (int)f_read();
        l2 = (int)l2_read();
        logRegHex(dut->clk, "read e ", 8, e, " (before clk)");
        logRegHex(dut->clk, "read f ", 8, f, " (before clk)");
        logRegHex(dut->clk, "read l2", 8, l2, " (before clk)");

        // We have already tested that reading of registers, memory elements
        // and wires works. So we just need to check that l1 reads back as the
        // correct combination of bits after the clock. It should be the 8
        // bits: {e[7:4], f[3:0]}.
        checkResult(l2 == ((e & 0xf0) | (f & 0x0f)),
                    "Test of complex register reading l2 failed.");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Test we can write a complex register
#ifdef TEST_VERBOSE
    cout << endl;
    cout << "Test of complex register writing" << endl;
    cout << "================================" << endl;
#endif

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;

        b = (int)b_read();
        mem32 = (int)mem32_read();
        e = (int)e_read();
        logRegHex(dut->clk, "read  b    ", 8, b, " (before write)");
        logRegHex(dut->clk, "read  mem32", 8, mem32, " (before write)");
        logRegHex(dut->clk, "read  e    ", 8, e, " (before write)");

        int l1 = 0x5a5a;
        l1_write(reinterpret_cast<const svBitVecVal*>(&l1));
        logRegHex(dut->clk, "write l1   ", 15, l1, " (before clk)");

        int b_after = (int)b_read();
        int mem32_after = (int)mem32_read();
        int e_after = (int)e_read();
        int l1_after = (int)l1_read();
        logRegHex(dut->clk, "read  b    ", 8, b_after, " (before clk)");
        logRegHex(dut->clk, "read  mem32", 8, mem32_after, " (before clk)");
        logRegHex(dut->clk, "read  e    ", 8, e_after, " (before clk)");
        logRegHex(dut->clk, "read  l1   ", 15, l1_after, " (before clk)");

        // We need to check that when we write l1, the correct fields, and
        // only the correct fields are set in its component registers, wires
        // and memory elements. l1 is 15 bits:
        // {b[3:0],mem[32][7:6],e[6:1],mem[32][2:0]}.
        int b_new = (b & 0xf0) | ((l1 & 0x7800) >> 11);
        int mem32_new = (mem32 & 0x38) | ((l1 & 0x0600) >> 3) | (l1 & 0x0007);
        int e_new = (e & 0x81) | ((l1 & 0x01f8) >> 2);
        checkResult((b_new == b_after) && (mem32_new == mem32_after) && (e_new == e_after),
                    "Test of complex register writing l1 failed.");

        dut->eval();

        b = (int)b_read();
        mem32 = (int)mem32_read();
        d = (int)d_read();
        l1 = (int)l1_read();
        logRegHex(dut->clk, "read  b    ", 8, b, " (after clk)");
        logRegHex(dut->clk, "read  mem32", 8, mem32, " (after clk)");
        logRegHex(dut->clk, "read  d    ", 8, d, " (after clk)");
        logRegHex(dut->clk, "read  l1   ", 15, l1, " (after clk)");
    }

#ifdef TEST_VERBOSE
    cout << endl;
#endif

    checkFinish("t_dpi_accessors unexpected finish");

    for (int i = 0; !Verilated::gotFinish() && (i < 4); i++) {
        dut->clk = 1 - dut->clk;

        e = (int)e_read();
        f = (int)f_read();
        logRegHex(dut->clk, "read  e ", 8, e, " (before write)");
        logRegHex(dut->clk, "read  f ", 8, f, " (before write)");

        int l2 = 0xa5 + i;
        l2_write(reinterpret_cast<const svBitVecVal*>(&l2));
        logRegHex(dut->clk, "write l2", 8, l2, " (before clk)");

        int e_after = (int)e_read();
        int f_after = (int)f_read();
        int l2_after = (int)l2_read();
        logRegHex(dut->clk, "read  e ", 8, e_after, " (before clk)");
        logRegHex(dut->clk, "read  f ", 8, f_after, " (before clk)");
        logRegHex(dut->clk, "read  l2", 8, l2_after, " (before clk)");

        // We need to check that when we write l2, the correct fields, and
        // only the correct fields are set in its component registers. l is 8
        // bits: {e[5:2], f[5:2]}
        int e_new = (e & 0xc3) | ((l2 & 0xf0) >> 2);
        int f_new = (f & 0xc3) | ((l2 & 0x0f) << 2);
        checkResult((e_new == e_after) && (f_new == f_after),
                    "Test of complex register writing l2 failed.");

        dut->eval();

        e = (int)e_read();
        f = (int)f_read();
        l2 = (int)l2_read();
        logRegHex(dut->clk, "read  e ", 8, e, " (before clk)");
        logRegHex(dut->clk, "read  f ", 8, f, " (before clk)");
        logRegHex(dut->clk, "read  l2", 8, l2, " (before clk)");
    }

    checkFinish("t_dpi_accessors unexpected finish");

    // Tidy up
    dut->final();
    cout << "*-* All Finished *-*" << endl;
}

// Local Variables:
// c-file-style:"cc-mode"
// End:
