text: /* Test mpf_eq.
  
  Copyright 2009, 2012 Free Software Foundation, Inc.
  
  This file is part of the GNU MP Library test suite.
  
  The GNU MP Library test suite is free software; you can redistribute it
  and/or modify it under the terms of the GNU 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 test suite 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 General
  Public License for more details.
  
  You should have received a copy of the GNU General Public License along with
  the GNU MP Library test suite.  If not, see https://www.gnu.org/licenses/.  */
  
  #include <stdio.h>
  #include <stdlib.h>
  
  #include "gmp.h"
  #include "gmp-impl.h"
  #include "tests.h"
  
  #define SZ (2 * sizeof(mp_limb_t))
  
  void insert_random_low_zero_limbs (mpf_t, gmp_randstate_ptr);
  void dump_abort (mpf_t, mpf_t, int, int, int, int, int, long);
  void hexdump (mpf_t);
  
  void
  check_data (void)
  {
    static const struct
    {
      struct {
        int        exp, size;
        mp_limb_t  d[10];
      } x, y;
      mp_bitcnt_t bits;
      int want;
  
    } data[] = {
      { { 0, 0, { 0 } },             { 0, 0, { 0 } },    0, 1 },
  
      { { 0, 1, { 7 } },             { 0, 1, { 7 } },    0, 1 },
      { { 0, 1, { 7 } },             { 0, 1, { 7 } },   17, 1 },
      { { 0, 1, { 7 } },             { 0, 1, { 7 } }, 4711, 1 },
  
      { { 0, 1, { 7 } },             { 0, 1, { 6 } },    0, 1 },
      { { 0, 1, { 7 } },             { 0, 1, { 6 } },    2, 1 },
      { { 0, 1, { 7 } },             { 0, 1, { 6 } },    3, 0 },
  
      { { 0, 0, { 0 } },             { 0, 1, { 1 } },    0, 0 },
      { { 0, 1, { 1 } },             { 0,-1 ,{ 1 } },    0, 0 },
      { { 1, 1, { 1 } },             { 0, 1, { 1 } },    0, 0 },
  
      { { 0, 1, { 8 } },             { 0, 1, { 4 } },    0, 0 },
  
      { { 0, 2, { 0, 3 } },          { 0, 1, { 3 } }, 1000, 1 },
    };
  
    mpf_t  x, y;
    int got, got_swapped;
    int i;
    mp_trace_base = 16;
  
    for (i = 0; i < numberof (data); i++)
      {
        PTR(x) = (mp_ptr) data[i].x.d;
        SIZ(x) = data[i].x.size;
        EXP(x) = data[i].x.exp;
        PREC(x) = numberof (data[i].x.d);
        MPF_CHECK_FORMAT (x);
  
        PTR(y) = (mp_ptr) data[i].y.d;
        SIZ(y) = data[i].y.size;
        EXP(y) = data[i].y.exp;
        PREC(y) = numberof (data[i].y.d);
        MPF_CHECK_FORMAT (y);
  
        got         = mpf_eq (x, y, data[i].bits);
        got_swapped = mpf_eq (y, x, data[i].bits);
  
        if (got != got_swapped || got != data[i].want)
  	{
  	  printf ("check_data() wrong result at data[%d]\n", i);
  	  mpf_trace ("x   ", x);
  	  mpf_trace ("y   ", y);
  	  printf ("got         %d\n", got);
  	  printf ("got_swapped %d\n", got_swapped);
  	  printf ("want        %d\n", data[i].want);
  	  abort ();
          }
      }
  }
  
  void
  check_random (long reps)
  {
    unsigned long test;
    gmp_randstate_ptr rands = RANDS;
    mpf_t a, b, x;
    mpz_t ds;
    int hibits, lshift1, lshift2;
    int xtra;
  
  #define HIBITS 10
  #define LSHIFT1 10
  #define LSHIFT2 10
  
    mpf_set_default_prec ((1 << HIBITS) + (1 << LSHIFT1) + (1 << LSHIFT2));
  
    mpz_init (ds);
    mpf_inits (a, b, x, NULL);
  
    for (test = 0; test < reps; test++)
      {
        mpz_urandomb (ds, rands, HIBITS);
        hibits = mpz_get_ui (ds) + 1;
        mpz_urandomb (ds, rands, hibits);
        mpz_setbit (ds, hibits  - 1);	/* make sure msb is set */
        mpf_set_z (a, ds);
        mpf_set_z (b, ds);
  
        mpz_urandomb (ds, rands, LSHIFT1);
        lshift1 = mpz_get_ui (ds);
        mpf_mul_2exp (a, a, lshift1 + 1);
        mpf_mul_2exp (b, b, lshift1 + 1);
        mpf_add_ui (a, a, 1);	/* make a one-bit difference */
  
        mpz_urandomb (ds, rands, LSHIFT2);
        lshift2 = mpz_get_ui (ds);
        mpf_mul_2exp (a, a, lshift2);
        mpf_mul_2exp (b, b, lshift2);
        mpz_urandomb (ds, rands, lshift2);
        mpf_set_z (x, ds);
        mpf_add (a, a, x);
        mpf_add (b, b, x);
  
        insert_random_low_zero_limbs (a, rands);
        insert_random_low_zero_limbs (b, rands);
  
        if (mpf_eq (a, b, lshift1 + hibits) == 0 ||
  	  mpf_eq (b, a, lshift1 + hibits) == 0)
  	{
  	  dump_abort (a, b, lshift1 + hibits, lshift1, lshift2, hibits, 1, test);
  	}
        for (xtra = 1; xtra < 100; xtra++)
  	if (mpf_eq (a, b, lshift1 + hibits + xtra) != 0 ||
  	    mpf_eq (b, a, lshift1 + hibits + xtra) != 0)
  	  {
  	    dump_abort (a, b, lshift1 + hibits + xtra, lshift1, lshift2, hibits, 0, test);
  	  }
      }
  
    mpf_clears (a, b, x, NULL);
    mpz_clear (ds);
  }
  
  void
  insert_random_low_zero_limbs (mpf_t x, gmp_randstate_ptr rands)
  {
    mp_size_t max = PREC(x) - SIZ(x);
    mp_size_t s;
    mpz_t ds; mpz_init (ds);
    mpz_urandomb (ds, rands, 32);
    s = mpz_get_ui (ds) % (max + 1);
    MPN_COPY_DECR (PTR(x) + s, PTR(x), SIZ(x));
    MPN_ZERO (PTR(x), s);
    SIZ(x) += s;
    mpz_clear (ds);
  }
  
  void
  dump_abort (mpf_t a, mpf_t b, int cmp_prec, int lshift1, int lshift2, int hibits, int want, long test)
  {
    printf ("ERROR in test %ld\n", test);
    printf ("want %d got %d from mpf_eq\n", want, 1-want);
    printf ("cmp_prec = %d\n", cmp_prec);
    printf ("lshift1 = %d\n", lshift1);
    printf ("lshift2 = %d\n", lshift2);
    printf ("hibits = %d\n", hibits);
    hexdump (a); puts ("");
    hexdump (b); puts ("");
    abort ();
  }
  
  void
  hexdump (mpf_t x)
  {
    mp_size_t i;
    for (i = ABSIZ(x) - 1; i >= 0; i--)
      {
        gmp_printf ("%0*MX", SZ, PTR(x)[i]);
        if (i != 0)
  	printf (" ");
      }
  }
  
  int
  main (int argc, char *argv[])
  {
    long reps = 10000;
  
    if (argc == 2)
      reps = strtol (argv[1], 0, 0);
  
    tests_start ();
  
    check_data ();
    check_random (reps);
  
    tests_end ();
    exit (0);
  }
  