/*
Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004 Free Software
Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP 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 3 of the License, or (at your
option) any later version.

The GNU MP 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 the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
*/

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "longlong.h"

#if defined (USG) || defined (__SVR4) || defined (_UNICOS) || defined (__hpux)
#include <time.h>

int
cputime ()
{
  if (CLOCKS_PER_SEC < 100000)
    return clock () * 1000 / CLOCKS_PER_SEC;
  return clock () / (CLOCKS_PER_SEC / 1000);
}
#else
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>

int
cputime ()
{
  struct rusage rus;

  getrusage (0, &rus);
  return rus.ru_utime.tv_sec * 1000 + rus.ru_utime.tv_usec / 1000;
}
#endif

static void print_posneg (mp_limb_t);
static void mpn_print (mp_ptr, mp_size_t);

#define LXW ((int) (2 * sizeof (mp_limb_t)))
#define M * 1000000

#ifndef CLOCK
#error "Don't know CLOCK of your machine"
#endif

#ifndef OPS
#define OPS (CLOCK/5)
#endif
#ifndef SIZE
#define SIZE 496
#endif
#ifndef TIMES
#define TIMES OPS/(SIZE+1)
#endif

#if N == 2
#define mpn_mul_N mpn_mul_2
#elif N == 3
#define mpn_mul_N mpn_mul_3
#elif N == 4
#define mpn_mul_N mpn_mul_4
#elif N == 5
#define mpn_mul_N mpn_mul_5
#elif N == 6
#define mpn_mul_N mpn_mul_6
#elif N == 7
#define mpn_mul_N mpn_mul_7
#elif N == 8
#define mpn_mul_N mpn_mul_8
#endif

mp_limb_t
refmpn_mul_N (mp_ptr rp, mp_srcptr up, mp_size_t n, mp_srcptr vp)
{
  int i;
  rp[n] = mpn_mul_1 (rp, up, n, *vp);
  rp++;
  vp++;
  for (i = 2; i < N; i++)
    {
      rp[n] = mpn_addmul_1 (rp, up, n, *vp);
      rp++;
      vp++;
    }
  return mpn_addmul_1 (rp, up, n, *vp);
}

int
main (int argc, char **argv)
{
  mp_limb_t up[SIZE];
  mp_limb_t ref[SIZE + N - 1];
  mp_limb_t mem[SIZE + N + 1];
  mp_ptr rp = mem + 1;
  mp_limb_t vp[N];
  mp_limb_t cy_ref, cy_try;
  int i;
  long t0, t;
  unsigned test;
  mp_size_t size;
  double cyc;
  unsigned ntests;

  ntests = ~(unsigned) 0;
  if (argc == 2)
    ntests = strtol (argv[1], 0, 0);

  for (test = 1; test <= ntests; test++)
    {
#if TIMES == 1 && ! defined (PRINT)
      if (test % (CLOCK / SIZE / 1000) == 0)
	{
	  printf ("\r%u", test);
	  fflush (stdout);
	}
#endif

#ifdef RANDOM
      size = random () % SIZE + 1;
#else
      size = SIZE;
#endif

      rp[size + N - 1] = 0x12345678;
      rp[-1] = 0x87654321;

      mpn_random (vp, N);

#if TIMES != 1			/* run timing tests unless asked not to */
      mpn_random (up, size);

      MPN_COPY (ref, rp, size + N - 1);
      t0 = cputime();
      for (i = 0; i < TIMES; i++)
	mpn_mul_N (ref, up, size, vp);
      t = cputime() - t0;
      cyc = ((double) t * CLOCK) / (TIMES * size * 1000.0) / N;
      printf ("mpn_mul_N:    %5ldms (%.3f cycles/limb) [%.2f Gb/s]\n",
	      t, cyc, CLOCK/cyc*BITS_PER_MP_LIMB*BITS_PER_MP_LIMB/1e9);
#endif

#ifdef ZEROu
      MPN_ZERO (up, size);
#else
      mpn_random2 (up, size);
#endif
      mpn_random2 (vp, N);
      mpn_random2 (rp, size + N - 1);

#if defined (PRINT) || defined (PRINTV)
      printf ("vp=");
      mpn_print (vp, N);
#endif
#ifdef PRINT
      printf ("%*s ", 3 + N * LXW, "");
      mpn_print (rp, size);
      printf ("%*s ", 3 + N * LXW, "");
      mpn_print (up, size);
#endif

      MPN_COPY (ref, rp, size + N - 1);
      cy_ref = refmpn_mul_N (ref, up, size, vp);
      cy_try = mpn_mul_N (rp, up, size, vp);

#ifdef PRINT
      printf ("%*lX ", LXW, cy_ref);
      mpn_print (ref, size + N - 1);
      printf ("%*lX ", LXW, cy_try);
      mpn_print (rp, size + N - 1);
#endif

#ifndef NOCHECK
      if (cy_ref != cy_try || mpn_cmp (ref, rp, size + N - 1) != 0
	  || rp[size + N - 1] != 0x12345678 || rp[-1] != 0x87654321)
	{
	  printf ("\n        ref%*s try%*s diff\n", LXW - 3, "", 2 * LXW - 6, "");
	  for (i = 0; i < size + N - 1; i++)
	    {
	      printf ("%6d: ", i);
	      printf ("%0*llX ", LXW, (unsigned long long) ref[i]);
	      printf ("%0*llX ", LXW, (unsigned long long) rp[i]);
	      print_posneg (rp[i] - ref[i]);
	      printf ("\n");
	    }
	  printf ("retval: ");
	  printf ("%0*llX ", LXW, (unsigned long long) cy_ref);
	  printf ("%0*llX ", LXW, (unsigned long long) cy_try);
	  print_posneg (cy_try - cy_ref);
	  printf ("\n");
	  if (rp[-1] != 0x87654321)
	    printf ("clobbered at low end\n");
	  if (rp[size + N - 1] != 0x12345678)
	    printf ("clobbered at high end\n");
	  printf ("TEST NUMBER %u\n", test);
	  abort();
	}
#endif
    }
  exit (0);
}

static void
print_posneg (mp_limb_t d)
{
  char buf[LXW + 2];
  if (d == 0)
    printf (" %*X", LXW, 0);
  else if (-d < d)
    {
      sprintf (buf, "%llX", (unsigned long long) -d);
      printf ("%*s-%s", LXW - (int) strlen (buf), "", buf);
    }
  else
    {
      sprintf (buf, "%llX", (unsigned long long) d);
      printf ("%*s+%s", LXW - (int) strlen (buf), "", buf);
    }
}

static void
mpn_print (mp_ptr p, mp_size_t size)
{
  mp_size_t i;

  for (i = size - 1; i >= 0; i--)
    {
#ifdef _LONG_LONG_LIMB
      printf ("%0*lX%0*lX", (int) (sizeof(mp_limb_t)),
	      (unsigned long) (p[i] >> (BITS_PER_MP_LIMB/2)),
              (int) (sizeof(mp_limb_t)), (unsigned long) (p[i]));
#else
      printf ("%0*lX", LXW, p[i]);
#endif
#ifdef SPACE
      if (i != 0)
	printf (" ");
#endif
    }
  puts ("");
}
