/* Test that routines allow reusing a source variable as destination.

   Test all relevant functions except:
	mpz_bin_ui
	mpz_nextprime
	mpz_mul_si
	mpz_addmul_ui (should this really allow a+=a*c?)
Copyright (C) 1996, 1999, 2000 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 2.1 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; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */


#include <stdio.h>
#include "gmp.h"
#include "gmp-impl.h"
#include "urandom.h"

#ifndef SIZE
#define SIZE 50
#endif

typedef void (*dss_func) _PROTO ((mpz_ptr, mpz_srcptr, mpz_srcptr));
typedef void (*dsi_func) _PROTO ((mpz_ptr, mpz_srcptr, unsigned long int));
typedef unsigned long int (*dsi_div_func) _PROTO ((mpz_ptr, mpz_srcptr, unsigned long int));
typedef unsigned long int (*ddsi_div_func) _PROTO ((mpz_ptr, mpz_ptr, mpz_srcptr, unsigned long int));
typedef void (*ddss_div_func) _PROTO ((mpz_ptr, mpz_ptr, mpz_srcptr, mpz_srcptr));
typedef void (*ds_func) _PROTO ((mpz_ptr, mpz_srcptr));


void
#if __STDC__
mpz_xinvert (mpz_ptr r, mpz_srcptr a, mpz_srcptr b)
#else
mpz_xinvert (r, a, b)
     mpz_ptr    r;
     mpz_srcptr a;
     mpz_srcptr b;
#endif
{
  int res;
  res = mpz_invert (r, a, b);
  if (res == 0)
    mpz_set_ui (r, 0);
}

dss_func dss_funcs[] =
{
  mpz_add, mpz_sub, mpz_mul,
  mpz_cdiv_q, mpz_cdiv_r, mpz_fdiv_q, mpz_fdiv_r, mpz_tdiv_q, mpz_tdiv_r,
  mpz_xinvert,
  mpz_gcd, mpz_lcm, mpz_and, mpz_ior, mpz_xor
};
char *dss_func_names[] =
{
  "mpz_add", "mpz_sub", "mpz_mul",
  "mpz_cdiv_q", "mpz_cdiv_r", "mpz_fdiv_q", "mpz_fdiv_r", "mpz_tdiv_q", "mpz_tdiv_r",
  "mpz_xinvert",
  "mpz_gcd", "mpz_lcm", "mpz_and", "mpz_ior", "mpz_xor"
};
char dss_func_division[] = {0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0};

dsi_func dsi_funcs[] =
{
  /* Don't change order here without changing the code in main(). */
  mpz_add_ui, mpz_mul_ui, mpz_sub_ui,
  mpz_fdiv_q_2exp, mpz_fdiv_r_2exp,
  mpz_tdiv_q_2exp, mpz_tdiv_r_2exp,
  mpz_mul_2exp,
  mpz_pow_ui
};
char *dsi_func_names[] =
{
  "mpz_add_ui", "mpz_mul_ui", "mpz_sub_ui",
  "mpz_fdiv_q_2exp", "mpz_fdiv_r_2exp",
  "mpz_tdiv_q_2exp", "mpz_tdiv_r_2exp",
  "mpz_mul_2exp",
  "mpz_pow_ui"
};

dsi_div_func dsi_div_funcs[] =
{
  mpz_cdiv_q_ui, mpz_cdiv_r_ui,
  mpz_fdiv_q_ui, mpz_fdiv_r_ui,
  mpz_tdiv_q_ui, mpz_tdiv_r_ui
};
char *dsi_div_func_names[] =
{
  "mpz_cdiv_q_ui", "mpz_cdiv_r_ui",
  "mpz_fdiv_q_ui", "mpz_fdiv_r_ui",
  "mpz_tdiv_q_ui", "mpz_tdiv_r_ui"
};

ddsi_div_func ddsi_div_funcs[] =
{
  mpz_cdiv_qr_ui,
  mpz_fdiv_qr_ui,
  mpz_tdiv_qr_ui
};
char *ddsi_div_func_names[] =
{
  "mpz_cdiv_qr_ui",
  "mpz_fdiv_qr_ui",
  "mpz_tdiv_qr_ui"
};

ddss_div_func ddss_div_funcs[] =
{
  mpz_cdiv_qr,
  mpz_fdiv_qr,
  mpz_tdiv_qr
};
char *ddss_div_func_names[] =
{
  "mpz_cdiv_qr",
  "mpz_fdiv_qr",
  "mpz_tdiv_qr"
};

ds_func ds_funcs[] =
{
  mpz_abs, mpz_com, mpz_neg, mpz_sqrt
};
char *ds_func_names[] =
{
  "mpz_abs", "mpz_com", "mpz_neg", "mpz_sqrt"
};


/* Really use `defined (__STDC__)' here; we want it to be true for Sun C */
#if defined (__STDC__) || defined (__cplusplus)
#define FAIL(class,indx,op1,op2,op3) \
  do {									\
  class##_funcs[indx] = 0;						\
  dump_abort (class##_func_names[indx], op1, op2, op3);			\
  failures++;								\
  } while (0)
#else
#define FAIL(class,indx,op1,op2,op3) \
  do {									\
  class/**/_funcs[indx] = 0;						\
  dump_abort (class/**/_func_names[indx], op1, op2, op3);		\
  failures++;								\
  } while (0)
#endif


main (argc, argv)
     int argc;
     char **argv;
{
  int i;
  int pass, reps = 1000;
  mpz_t in1, in2, in3;
  unsigned long int in2i;
  mpz_t res1, res2, res3;
  mpz_t ref1, ref2, ref3;
  mpz_t t;
  unsigned long int r1, r2;
  long failures = 0;

  if (argc == 2)
     reps = atoi (argv[1]);

  mpz_init (in1);
  mpz_init (in2);
  mpz_init (in3);
  mpz_init (ref1);
  mpz_init (ref2);
  mpz_init (ref3);
  mpz_init (res1);
  mpz_init (res2);
  mpz_init (res3);
  mpz_init (t);

  for (pass = 1; pass <= reps; pass++)
    {
      mpz_random2 (in1, urandom () % (2 * SIZE) - SIZE);
      mpz_random2 (in2, urandom () % (2 * SIZE) - SIZE);
      mpz_random2 (in3, urandom () % (2 * SIZE) - SIZE);

      for (i = 0; i < sizeof (dss_funcs) / sizeof (dss_func); i++)
	{
	  if (dss_funcs[i] == 0)
	    continue;
	  if (dss_func_division[i] && mpz_sgn (in2) == 0)
	    continue;

	  (dss_funcs[i]) (ref1, in1, in2);

	  mpz_set (res1, in1);
	  (dss_funcs[i]) (res1, res1, in2);
	  if (mpz_cmp (ref1, res1) != 0)
	    FAIL (dss, i, in1, in2, NULL);

	  mpz_set (res1, in2);
	  (dss_funcs[i]) (res1, in1, res1);
	  if (mpz_cmp (ref1, res1) != 0)
	    FAIL (dss, i, in1, in2, NULL);
	}

      for (i = 0; i < sizeof (ddss_div_funcs) / sizeof (ddss_div_func); i++)
	{
	  if (ddss_div_funcs[i] == 0)
	    continue;
	  if (mpz_sgn (in2) == 0)
	    continue;

	  (ddss_div_funcs[i]) (ref1, ref2, in1, in2);

	  mpz_set (res1, in1);
	  (ddss_div_funcs[i]) (res1, res2, res1, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0)
	    FAIL (ddss_div, i, in1, in2, NULL);

	  mpz_set (res2, in1);
	  (ddss_div_funcs[i]) (res1, res2, res2, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0)
	    FAIL (ddss_div, i, in1, in2, NULL);

	  mpz_set (res1, in2);
	  (ddss_div_funcs[i]) (res1, res2, in1, res1);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0)
	    FAIL (ddss_div, i, in1, in2, NULL);

	  mpz_set (res2, in2);
	  (ddss_div_funcs[i]) (res1, res2, in1, res2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0)
	    FAIL (ddss_div, i, in1, in2, NULL);
	}

      for (i = 0; i < sizeof (ds_funcs) / sizeof (ds_func); i++)
	{
	  if (ds_funcs[i] == 0)
	    continue;
	  if (strcmp (ds_func_names[i], "mpz_sqrt") == 0
	      && mpz_sgn (in1) < 0)
	    continue;

	  (ds_funcs[i]) (ref1, in1);

	  mpz_set (res1, in1);
	  (ds_funcs[i]) (res1, res1);
	  if (mpz_cmp (ref1, res1) != 0)
	    FAIL (ds, i, in1, in2, NULL);
	}

      in2i = mpz_get_ui (in2);

      for (i = 0; i < sizeof (dsi_funcs) / sizeof (dsi_func); i++)
	{
	  if (dsi_funcs[i] == 0)
	    continue;
	  if (strcmp (dsi_func_names[i], "mpz_fdiv_q_2exp") == 0)
	    /* Limit exponent to something reasonable for the division
	       functions.  Without this, we'd  normally shift things off
	       the end and just generate the trivial values 1, 0, -1.  */
	    in2i %= 0x1000;
	  if (strcmp (dsi_func_names[i], "mpz_mul_2exp") == 0)
	    /* Limit exponent more for mpz_mul_2exp to save time.  */
	    in2i %= 0x100;
	  if (strcmp (dsi_func_names[i], "mpz_pow_ui") == 0)
	    /* Limit exponent yet more for mpz_pow_ui to save time.  */
	    in2i %= 0x10;

	  (dsi_funcs[i]) (ref1, in1, in2i);

	  mpz_set (res1, in1);
	  (dsi_funcs[i]) (res1, res1, in2i);
	  if (mpz_cmp (ref1, res1) != 0)
	    FAIL (dsi, i, in1, in2, NULL);
	}

      if (in2i != 0)	  /* Don't divide by 0.  */
	{
	  for (i = 0; i < sizeof (dsi_div_funcs) / sizeof (dsi_div_funcs); i++)
	    {
	      r1 = (dsi_div_funcs[i]) (ref1, in1, in2i);

	      mpz_set (res1, in1);
	      r2 = (dsi_div_funcs[i]) (res1, res1, in2i);
	      if (mpz_cmp (ref1, res1) != 0 || r1 != r2)
		FAIL (dsi_div, i, in1, in2, NULL);
	    }

	  for (i = 0; i < sizeof (ddsi_div_funcs) / sizeof (ddsi_div_funcs); i++)
	    {
	      r1 = (ddsi_div_funcs[i]) (ref1, ref2, in1, in2i);

	      mpz_set (res1, in1);
	      r2 = (ddsi_div_funcs[i]) (res1, res2, res1, in2i);
	      if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0 || r1 != r2)
		FAIL (ddsi_div, i, in1, in2, NULL);

	      mpz_set (res2, in1);
	      (ddsi_div_funcs[i]) (res1, res2, res2, in2i);
	      if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0 || r1 != r2)
		FAIL (ddsi_div, i, in1, in2, NULL);
	    }
	}

      if (mpz_sgn (in1) >= 0)
	{
	  mpz_sqrtrem (ref1, ref2, in1);

	  mpz_set (res1, in1);
	  mpz_sqrtrem (res1, res2, res1);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0)
	    dump_abort ("mpz_sqrtrem", in1, NULL, NULL);

	  mpz_set (res2, in1);
	  mpz_sqrtrem (res1, res2, res2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0)
	    dump_abort ("mpz_sqrtrem", in1, NULL, NULL);
	}

      if (mpz_sgn (in1) >= 0)
	{
	  mpz_root (ref1, in1, in2i % 0x100 + 1);

	  mpz_set (res1, in1);
	  mpz_root (res1, res1, in2i % 0x100 + 1);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_root", in1, in2, NULL);
	}

      if (pass < reps / 2)	/* run fewer tests since gcdext lots of time */
	{
	  mpz_gcdext (ref1, ref2, ref3, in1, in2);

	  mpz_set (res1, in1);
	  mpz_gcdext (res1, res2, res3, res1, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res2, in1);
	  mpz_gcdext (res1, res2, res3, res2, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res3, in1);
	  mpz_gcdext (res1, res2, res3, res3, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res1, in2);
	  mpz_gcdext (res1, res2, res3, in1, res1);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res2, in2);
	  mpz_gcdext (res1, res2, res3, in1, res2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res3, in2);
	  mpz_gcdext (res1, res2, res3, in1, res3);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res1, in1);
	  mpz_gcdext (res1, res2, NULL, res1, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res2, in1);
	  mpz_gcdext (res1, res2, NULL, res2, in2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res1, in2);
	  mpz_gcdext (res1, res2, NULL, in1, res1);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);

	  mpz_set (res2, in2);
	  mpz_gcdext (res1, res2, NULL, in1, res2);
	  if (mpz_cmp (ref1, res1) != 0 || mpz_cmp (ref2, res2) != 0
	      || mpz_cmp (ref3, res3) != 0)
	    dump_abort ("mpz_gcdext", in1, in2, NULL);
	}

      /* Don't run mpz_powm for huge exponents or when undefined.  */
      if (mpz_sizeinbase (in2, 2) < 250 && mpz_sgn (in3) != 0)
	{
	  mpz_powm (ref1, in1, in2, in3);

	  mpz_set (res1, in1);
	  mpz_powm (res1, res1, in2, in3);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_powm", in1, in2, in3);

	  mpz_set (res1, in2);
	  mpz_powm (res1, in1, res1, in3);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_powm", in1, in2, in3);

	  mpz_set (res1, in3);
	  mpz_powm (res1, in1, in2, res1);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_powm", in1, in2, in3);
	}

      /* Don't run mpz_powm_ui when undefined.  */
      if (mpz_sgn (in3) != 0)
	{
	  mpz_powm_ui (ref1, in1, in2i, in3);

	  mpz_set (res1, in1);
	  mpz_powm_ui (res1, res1, in2i, in3);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_powm_ui", in1, in2, in3);

	  mpz_set (res1, in3);
	  mpz_powm_ui (res1, in1, in2i, res1);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_powm_ui", in1, in2, in3);
	}

      {
	r1 = mpz_gcd_ui (ref1, in1, in2i);

	mpz_set (res1, in1);
	r2 = mpz_gcd_ui (res1, res1, in2i);
	if (mpz_cmp (ref1, res1) != 0)
	  dump_abort ("mpz_gcd_ui", in1, in2, NULL);
      }

      if (mpz_cmp_ui (in2, 1L) > 0 && mpz_sgn (in1) != 0)
	{
	  /* Test mpz_remove */
	  mpz_remove (ref1, in1, in2);

	  mpz_set (res1, in1);
	  mpz_remove (res1, res1, in2);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_remove", in1, in2, NULL);

	  mpz_set (res1, in2);
	  mpz_remove (res1, in1, res1);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_remove", in1, in2, NULL);
	}

      if (mpz_sgn (in2) != 0)
	{
	  /* Test mpz_divexact */
	  mpz_mul (t, in1, in2);
	  mpz_divexact (ref1, t, in2);

	  mpz_set (res1, t);
	  mpz_divexact (res1, res1, in2);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_divexact", t, in2, NULL);

	  mpz_set (res1, in2);
	  mpz_divexact (res1, t, res1);
	  if (mpz_cmp (ref1, res1) != 0)
	    dump_abort ("mpz_divexact", t, in2, NULL);
	}
    }

  if (failures != 0)
    {
      fprintf (stderr, "mpz/reuse: %d error%s\n", failures, "s" + (failures == 1));
      exit (1);
    }

  exit (0);
}

dump_abort (name, in1, in2, in3)
     char *name;
     mpz_t in1, in2, in3;
{
  printf ("failure in %s (", name);
  mpz_out_str (stdout, -16, in1);
  if (in2 != NULL)
    {
      printf (" ");
      mpz_out_str (stdout, -16, in2);
    }
  if (in3 != NULL)
    {
      printf (" ");
      mpz_out_str (stdout, -16, in3);
    }
  printf (")\n");
}