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/*

 * $Id: aeMB_testbench.c,v 1.7 2007-11-02 18:32:19 sybreon Exp $

 *

 * AEMB Function Verification C Testbench

 * Copyright (C) 2004-2007 Shawn Tan Ser Ngiap <shawn.tan@aeste.net>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public License

 * as published by the Free Software Foundation; either version 2.1 of

 * the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307

 * USA

 *

 * DESCRIPTION

 * It tests a whole gamut of operations and is tightly linked to the

 * ae68_testbench.v testbench module for verification.

 *

 * HISTORY

 * $Log: not supported by cvs2svn $

 * Revision 1.6  2007/04/30 15:57:10  sybreon

 * Removed byte acrobatics.

 *

 * Revision 1.5  2007/04/27 15:17:59  sybreon

 * Added code documentation.

 * Added new tests that test floating point, modulo arithmetic and multiplication/division.

 *

 * Revision 1.4  2007/04/25 22:15:05  sybreon

 * Added support for 8-bit and 16-bit data types.

 *

 * Revision 1.3  2007/04/04 14:09:04  sybreon

 * Added initial interrupt/exception support.

 *

 * Revision 1.2  2007/04/04 06:07:45  sybreon

 * Fixed C code bug which passes the test

 *

 * Revision 1.1  2007/03/09 17:41:57  sybreon

 * initial import

 *

 */

/**

   INTERRUPT TEST

   This tests for the following:

   - Pointer addressing

   - Interrupt handling

 */

void int_call_func (void); // __attribute__((save_volatiles));

void int_handler_func (void) __attribute__ ((interrupt_handler));

void int_handler_func (void) {

  int_call_func();

}

void int_call_func (void) {

  int* pio = (int*)0xFFFFFFFF;

  *pio = 0x52544E49; // "INTR"

}

/**

   FIBONACCI TEST

   http://en.literateprograms.org/Fibonacci_numbers_(C)

   This tests for the following:

   - Recursion & Iteration

   - 32/16/8-bit data handling

*/

unsigned int fib_slow(unsigned int n)

{

  return n < 2 ? n : fib_slow(n-1) + fib_slow(n-2);

}

unsigned int fib_fast(unsigned int n)

{

  unsigned int a[3];

  unsigned int *p=a;

  unsigned int i;

  for(i=0; i<=n; ++i) {

    if(i<2) *p=i;

    else {

      if(p==a) *p=*(a+1)+*(a+2);

      else if(p==a+1) *p=*a+*(a+2);

      else *p=*a+*(a+1);

    }

    if(++p>a+2) p=a;

  }

  return p==a?*(p+2):*(p-1);

}

int fib_test(int max) {

  unsigned int n;

  unsigned int fast, slow;

  // 32-bit LUT

  unsigned int fib_lut32[] = {

    0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233

  };

  // 16-bit LUT

  unsigned short fib_lut16[] = {

    0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233

  };

  // 8-bit LUT

  unsigned char fib_lut8[] = {

    0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233

  };

  for (n=0;n<max;n++) {

    slow = fib_slow(n);

    fast = fib_fast(n);

    if ((slow != fast) ||

        (fast != fib_lut32[n]) ||

        (fast != fib_lut16[n]) ||

        (fast != fib_lut8[n])) {

      return -1;

    }

  }

  return 0;

}

/**

   EUCLIDEAN TEST

   http://en.literateprograms.org/Euclidean_algorithm_(C)

   This tests for the following:

   - Modulo arithmetic

   - Goto

*/

int euclid_gcd(int a, int b) {

  if (b > a) goto b_larger;

  while (1) {

    a = a % b;

    if (a == 0) return b;

  b_larger:

    b = b % a;

    if (b == 0) return a;

  }

}

int euclid_test(int max)

{

  int n;

  int euclid;

  // Random Numbers

  int euclid_a[] = {

    1804289383, 1681692777, 1957747793, 719885386, 596516649,

    1025202362, 783368690, 2044897763, 1365180540, 304089172,

    35005211, 294702567, 336465782, 278722862

  };

  int euclid_b[] = {

    846930886, 1714636915, 424238335, 1649760492, 1189641421,

    1350490027, 1102520059, 1967513926, 1540383426, 1303455736,

    521595368, 1726956429, 861021530, 233665123

  };

  // GCD 

  int euclid_lut[] = {

    1, 1, 1, 2, 1, 1, 1, 1, 6, 4, 1, 3, 2, 1

  };

  for (n=0;n<max;n++) {

    euclid = euclid_gcd(euclid_a[n],euclid_b[n]);

    if (euclid != euclid_lut[n]) {

      return -1;

    }

  }

  return 0;

}

/**

   NEWTON-RHAPSON

   http://en.literateprograms.org/Newton-Raphson's_method_for_root_finding_(C)

   This tests for the following:

   - Multiplication & Division

   - Floating point arithmetic

   - Integer to Float conversion

*/

float newton_sqrt(float n)

{

  float x = 0.0;

  float xn = 0.0;

  int iters = 0;

  int i;

  for (i = 0; i <= (int)n; ++i)

    {

      float val = i*i-n;

      if (val == 0.0)

        return i;

      if (val > 0.0)

        {

          xn = (i+(i-1))/2.0;

          break;

        }

    }

  while (!(iters++ >= 100

           || x == xn))

    {

      x = xn;

      xn = x - (x * x - n) / (2 * x);

    }

  return xn;

}

int newton_test (int max) {

  int n;

  float newt;

  // 32-bit LUT

  float newt_lut[] = {

    0.000000000000000000000000,

    1.000000000000000000000000,

    1.414213538169860839843750,

    1.732050776481628417968750,

    2.000000000000000000000000,

    2.236068010330200195312500,

    2.449489831924438476562500,

    2.645751237869262695312500,

    2.828427076339721679687500,

    3.000000000000000000000000,

    3.162277698516845703125000,

    3.316624879837036132812500,

    3.464101552963256835937500,

    3.605551242828369140625000,

    3.741657495498657226562500

  };

  for (n=0;n<max;n++) {

    newt = newton_sqrt(n);

    if (newt != newt_lut[n]) {

      return -1;

    }

  }

  return 0;

}

/**

   MAIN TEST PROGRAMME

   This is the main test procedure. It will output signals onto the

   MPI port that is checked by the testbench.

 */

void int_enable()

{

  asm ("mfs r14, rmsr");

  asm ("ori r14, r14, 0x0002");

  asm ("mts rmsr, r14");

}

void int_disable()

{

  asm ("mfs r14, rmsr");

  asm ("andi r14, r14, 0x00FD");

  asm ("mts rmsr, r14");

}

int main ()

{

  // Message Passing Port

  int* mpi = (int*)0xFFFFFFFF;

  // Number of each test to run

  int max = 3;

  // Enable Global Interrupts

  int_enable();

  // Fibonacci Test

  if (fib_test(max) == -1) { *mpi = 0x4641494C; }

  // Euclid Test

  if (euclid_test(max) == -1) { *mpi = 0x4641494C; }

  // Newton-Rhapson Test

  if (newton_test(max) == -1) { *mpi = 0x4641494C; }

  // Disable Global Interrupts

  int_disable();

  // ALL PASSED

  return 0;

}