示例#1
0
void
fmpr_divappr_abs_ubound(fmpr_t z, const fmpr_t x, const fmpr_t y, slong prec)
{
    if (fmpr_is_special(x) || fmpr_is_special(y) || fmpz_is_pm1(fmpr_manref(y)))
    {
        fmpr_div(z, x, y, prec, FMPR_RND_UP);
        fmpr_abs(z, z);
    }
    else
    {
        fmpz_t t, u;
        slong xbits, ybits, tbits, ubits, shift;

        xbits = fmpz_bits(fmpr_manref(x));
        ybits = fmpz_bits(fmpr_manref(y));

        fmpz_init(t);
        fmpz_init(u);

        ubits = FLINT_MIN(ybits, prec);
        tbits = prec + ubits + 1;

        /* upper bound for |x|, shifted */
        if (xbits <= tbits)
        {
            fmpz_mul_2exp(t, fmpr_manref(x), tbits - xbits);
            fmpz_abs(t, t);
        }
        else if (fmpz_sgn(fmpr_manref(x)) > 0)
        {
            fmpz_cdiv_q_2exp(t, fmpr_manref(x), xbits - tbits);
        }
        else
        {
            fmpz_fdiv_q_2exp(t, fmpr_manref(x), xbits - tbits);
            fmpz_neg(t, t);
        }

        /* lower bound for |y|, shifted */
        if (ybits <= ubits)
            fmpz_mul_2exp(u, fmpr_manref(y), ubits - ybits);
        else
            fmpz_tdiv_q_2exp(u, fmpr_manref(y), ybits - ubits);
        fmpz_abs(u, u);

        fmpz_cdiv_q(fmpr_manref(z), t, u);

        shift = (ubits - ybits) - (tbits - xbits);
        fmpz_sub(fmpr_expref(z), fmpr_expref(x), fmpr_expref(y));
        if (shift >= 0)
            fmpz_add_ui(fmpr_expref(z), fmpr_expref(z), shift);
        else
            fmpz_sub_ui(fmpr_expref(z), fmpr_expref(z), -shift);

        _fmpr_normalise(fmpr_manref(z), fmpr_expref(z), prec, FMPR_RND_UP);

        fmpz_clear(t);
        fmpz_clear(u);
    }
}
示例#2
0
文件: fmpz.c 项目: hperl/flint
void fmpz_multi_mod_ui(unsigned long * out, fmpz_t in, fmpz_comb_t comb, fmpz_t ** temp)
{
   ulong i, j, k;
   ulong n = comb->n;
   long log_comb;
	ulong size;
	mp_limb_t * ptr;
	ulong num;
	unsigned long num_primes = comb->num_primes;

   if (num_primes == 1) // we are reducing modulo a single prime which is assumed to be big enough
   {
	  if ((long)in[0] > 0L) out[0] = in[1];
	  else if ((long)in[0] < 0L) out[0] = comb->primes[0] - in[1];
	  else out[0] = 0L;
	  return;
   }

   log_comb = n - 1;
   

   // find level in comb with entries bigger than the input integer
	log_comb = 0;
	if ((long) in[0] < 0L)
	  while ((fmpz_bits(in) >= fmpz_bits(comb->comb[log_comb][0]) - 1) && (log_comb < comb->n - 1)) log_comb++;
   else
		while (fmpz_cmpabs(in, comb->comb[log_comb][0]) >= 0) log_comb++;
   num = (1L<<(n - log_comb - 1));

	// set each entry of this level of temp to the input integer
	for (i = 0; i < num; i++)
   {
      fmpz_set(temp[log_comb][i], in);
   }
   log_comb--;
   num *= 2;
   
   // fill in other entries of temp by taking entries of temp at higher level mod pairs from comb
	while (log_comb > FLINT_LOG_MULTI_MOD_CUTOFF) // keep going until we reach the basecase
   {
      for (i = 0, j = 0; i < num; i += 2, j++)
      {
         fmpz_mod(temp[log_comb][i], temp[log_comb + 1][j], comb->comb[log_comb][i]);
         fmpz_mod(temp[log_comb][i+1], temp[log_comb + 1][j], comb->comb[log_comb][i+1]);
      }
      num *= 2;
      log_comb--;
   }
   
   // do basecase
	num /= 2;
   log_comb++;
   ulong stride = (1L << (log_comb + 1));
   for (i = 0, j = 0; j < num_primes; i++, j += stride)
   {
	   fmpz_multi_mod_ui_basecase(out + j, temp[log_comb][i], comb->primes + j, FLINT_MIN(stride, num_primes - j));
   }
}
示例#3
0
文件: add_naive.c 项目: isuruf/arb
slong
fmpr_add_naive(fmpr_t z, const fmpr_t x, const fmpr_t y, slong prec, fmpr_rnd_t rnd)
{
    slong shift, xsize, ysize;

    if (fmpr_is_special(x) || fmpr_is_special(y))
    {
        return _fmpr_add_special(z, x, y, prec, rnd);
    }

    shift = _fmpz_sub_small(fmpr_expref(x), fmpr_expref(y));

    if (shift == 0)
    {
        fmpz_add(fmpr_manref(z), fmpr_manref(x), fmpr_manref(y));
        fmpz_set(fmpr_expref(z), fmpr_expref(x));
    }
    else if (shift > 0)
    {
        ysize = _fmpz_size(fmpr_manref(y)) * FLINT_BITS;

        /* x and y do not overlap */
        if (shift > ysize && prec != FMPR_PREC_EXACT)
        {
            /* y does not overlap with result */
            if (ysize + prec - (slong) fmpz_bits(fmpr_manref(x)) < shift)
            {
                return _fmpr_add_eps(z, x, fmpz_sgn(fmpr_manref(y)), prec, rnd);
            }
        }

        fmpz_add_mul2exp(fmpr_manref(z), fmpr_manref(y), fmpr_manref(x), shift);
        fmpz_set(fmpr_expref(z), fmpr_expref(y));
    }
    else
    {
        shift = -shift;

        xsize = _fmpz_size(fmpr_manref(x)) * FLINT_BITS;

        /* x and y do not overlap */
        if (shift > xsize && prec != FMPR_PREC_EXACT)
        {
            /* y does not overlap with result */
            if (xsize + prec - (slong) fmpz_bits(fmpr_manref(y)) < shift)
            {
                return _fmpr_add_eps(z, y, fmpz_sgn(fmpr_manref(x)), prec, rnd);
            }
        }

        fmpz_add_mul2exp(fmpr_manref(z), fmpr_manref(x), fmpr_manref(y), shift);
        fmpz_set(fmpr_expref(z), fmpr_expref(x));
    }

    return _fmpr_normalise(fmpr_manref(z), fmpr_expref(z), prec, rnd);
}
示例#4
0
mp_bitcnt_t _fmpz_poly_2norm_normalised_bits(const fmpz * poly, long len)
{
   fmpz_t norm;
   mp_bitcnt_t bits;
   fmpz_init(norm);

	_fmpz_poly_2norm(norm, poly, len);

	bits = fmpz_bits(norm);
	fmpz_clear(norm);
   
   return bits - fmpz_bits(poly + len - 1) + 1;
}
示例#5
0
void
fmpz_poly_bit_unpack_unsigned(fmpz_poly_t poly, const fmpz_t f,
                                        mp_bitcnt_t bit_size)
{
    slong len;
    mpz_t tmp;

    if (fmpz_sgn(f) < 0)
    {
        flint_printf("Exception (fmpz_poly_bit_unpack_unsigned). Expected an unsigned value.\n");
        abort();
    }

    if (bit_size == 0 || fmpz_is_zero(f))
    {
        fmpz_poly_zero(poly);
        return;
    }

    len = (fmpz_bits(f) + bit_size - 1) / bit_size;

    mpz_init2(tmp, bit_size*len);
    flint_mpn_zero(tmp->_mp_d, tmp->_mp_alloc);
    fmpz_get_mpz(tmp, f);

    fmpz_poly_fit_length(poly, len);

    _fmpz_poly_bit_unpack_unsigned(poly->coeffs, len, tmp->_mp_d, bit_size);
    _fmpz_poly_set_length(poly, len);
    _fmpz_poly_normalise(poly);

    mpz_clear(tmp);
}
示例#6
0
文件: log.c 项目: isuruf/arb
void
arb_log_arf_huge(arb_t z, const arf_t x, slong prec)
{
    arf_t t;
    arb_t c;
    fmpz_t exp;
    slong wp;

    arf_init(t);
    arb_init(c);
    fmpz_init(exp);

    fmpz_neg(exp, ARF_EXPREF(x));
    arf_mul_2exp_fmpz(t, x, exp);

    wp = prec + 4 - fmpz_bits(exp);
    wp = FLINT_MAX(wp, 4);

    arb_log_arf(z, t, wp);
    arb_const_log2(c, prec + 4);
    arb_submul_fmpz(z, c, exp, prec);

    arf_clear(t);
    arb_clear(c);
    fmpz_clear(exp);
}
示例#7
0
slong
fmpq_cfrac_bound(const fmpq_t x)
{
    if (fmpz_is_one(fmpq_denref(x)))
        return 1;

    return fmpz_bits(fmpq_denref(x)) * ONE_OVER_LOG2_PHI + 2;
}
示例#8
0
文件: randtest.c 项目: isuruf/arb
void
fmpr_randtest_not_zero(fmpr_t x, flint_rand_t state, slong bits, slong mag_bits)
{
    fmpz_randtest_not_zero(fmpr_manref(x), state, bits);
    fmpz_randtest(fmpr_expref(x), state, mag_bits);
    fmpz_sub_ui(fmpr_expref(x), fmpr_expref(x), fmpz_bits(fmpr_manref(x)));
    _fmpr_normalise(fmpr_manref(x), fmpr_expref(x), bits, FMPR_RND_DOWN);
}
示例#9
0
文件: pow.c 项目: isuruf/arb
void
arb_pow(arb_t z, const arb_t x, const arb_t y, slong prec)
{
    if (arb_is_zero(y))
    {
        arb_one(z);
        return;
    }

    if (arb_is_zero(x))
    {
        if (arb_is_positive(y))
            arb_zero(z);
        else
            arb_indeterminate(z);
        return;
    }

    if (arb_is_exact(y) && !arf_is_special(arb_midref(x)))
    {
        const arf_struct * ymid = arb_midref(y);

        /* small half-integer or integer */
        if (arf_cmpabs_2exp_si(ymid, BINEXP_LIMIT) < 0 &&
            arf_is_int_2exp_si(ymid, -1))
        {
            fmpz_t e;
            fmpz_init(e);            

            if (arf_is_int(ymid))
            {
                arf_get_fmpz_fixed_si(e, ymid, 0);
                arb_pow_fmpz_binexp(z, x, e, prec);
            }
            else
            {
                arf_get_fmpz_fixed_si(e, ymid, -1);
                arb_sqrt(z, x, prec + fmpz_bits(e));
                arb_pow_fmpz_binexp(z, z, e, prec);
            }

            fmpz_clear(e);
            return;
        }
        else if (arf_is_int(ymid) && arf_sgn(arb_midref(x)) < 0)
        {
            /* use (-x)^n = (-1)^n * x^n to avoid NaNs
               at least at high enough precision */
            int odd = !arf_is_int_2exp_si(ymid, 1);
            _arb_pow_exp(z, x, 1, y, prec);
            if (odd)
                arb_neg(z, z);
            return;
        }
    }

    _arb_pow_exp(z, x, 0, y, prec);
}
示例#10
0
void renf_randtest(renf_t nf, flint_rand_t state, slong len, slong prec, mp_bitcnt_t bits)
{
    fmpz_poly_t p;
    fmpq_poly_t p2;
    fmpz * c_array;
    slong * k_array;
    slong n_interval, n_exact;
    ulong i;
    arb_t emb;

    /* compute a random irreducible polynomial */
    if (len <= 1)
    {
        fprintf(stderr, "ERROR (renf_randtest): got length < 2\n");
        abort();
    }

    fmpz_poly_init(p);
    do{
        fmpz_poly_randtest_irreducible(p, state, len, bits);
    }while(!fmpz_poly_has_real_root(p));

    /* pick a random real root */
    c_array = _fmpz_vec_init(p->length);
    k_array = malloc((p->length) * sizeof(slong));
    n_interval = 0;

    fmpz_poly_isolate_real_roots(NULL, &n_exact,
            c_array, k_array, &n_interval, p);

    if (n_interval == 0)
    {
        fprintf(stderr, "Runtime error\n");
        abort();
    }

    i = n_randint(state, n_interval);

    /* construct the associated number field */
    arb_init(emb);
    arb_from_interval(emb, c_array+i, k_array[i], fmpz_bits(c_array + i) + FLINT_MAX(k_array[i], 0) + 2);

    fmpq_poly_init(p2);
    fmpq_poly_set_fmpz_poly(p2, p);

    /* NOTE: renf init might not be happy with the ball emb */
    renf_init(nf, p2, emb, prec);

    _fmpz_vec_clear(c_array, p->length);
    free(k_array);
    fmpz_poly_clear(p);
    fmpq_poly_clear(p2);
    arb_clear(emb);
}
/* The coefficients in 2^d * \prod_{i=1}^d (x - cos(a_i)) are
   easily bounded using the binomial theorem. */
static slong
magnitude_bound(slong d)
{
    slong res;
    fmpz_t t;
    fmpz_init(t);
    fmpz_bin_uiui(t, d, d / 2);
    res = fmpz_bits(t);
    fmpz_clear(t);
    return FLINT_ABS(res) + d;
}
示例#12
0
int
main(void)
{
    int i, result;

    double output;
    slong exp;

    FLINT_TEST_INIT(state);

    flint_printf("get_d_2exp....");
    fflush(stdout);

    for (i = 0; i < 1000 * flint_test_multiplier(); i++)
    {
        fmpz_t a;
        fmpz_init(a);

        fmpz_randtest(a, state, 200);

        output = fmpz_get_d_2exp(&exp, a);

        result = (fmpz_bits(a) == exp);
        if (!result)
        {
            flint_printf("FAIL:\n");
            flint_printf("a = "), fmpz_print(a), flint_printf("\n");
            flint_printf("output = %f\n", output);
            flint_printf("exp = %wd, bits = %wu\n", exp, fmpz_bits(a));
            abort();
        }

        fmpz_clear(a);
    }

    FLINT_TEST_CLEANUP(state);
    
    flint_printf("PASS\n");
    return 0;
}
示例#13
0
void
acb_quadratic_roots_fmpz(acb_t r1, acb_t r2,
    const fmpz_t a, const fmpz_t b, const fmpz_t c, slong prec)
{
    fmpz_t d;
    fmpz_init(d);

    /* d = b^2 - 4ac */
    fmpz_mul(d, a, c);
    fmpz_mul_2exp(d, d, 2);
    fmpz_submul(d, b, b);
    fmpz_neg(d, d);

    /* +/- sqrt(d) */
    acb_zero(r1);
    if (fmpz_sgn(d) >= 0)
    {
        arb_sqrt_fmpz(acb_realref(r1), d, prec + fmpz_bits(d) + 4);
    }
    else
    {
        fmpz_neg(d, d);
        arb_sqrt_fmpz(acb_imagref(r1), d, prec + fmpz_bits(d) + 4);
    }
    acb_neg(r2, r1);

    /* -b */
    acb_sub_fmpz(r1, r1, b, prec + 4);
    acb_sub_fmpz(r2, r2, b, prec + 4);

    /* divide by 2a */
    fmpz_mul_2exp(d, a, 1);
    acb_div_fmpz(r1, r1, d, prec);
    acb_div_fmpz(r2, r2, d, prec);

    fmpz_clear(d);
    return;
}
示例#14
0
文件: t-height.c 项目: goens/flint2
int
main(void)
{
    int i, result;
    flint_rand_t state;

    printf("height....");
    fflush(stdout);

    flint_randinit(state);

    for (i = 0; i < 10000; i++)
    {
        fmpz *a;
        fmpz_t h;
        long len, bits, bits2;

        fmpz_init(h);

        len = n_randint(state, 100);

        a = _fmpz_vec_init(len);
        bits = n_randint(state, 200);
        _fmpz_vec_randtest(a, state, len, bits);

        bits2 = _fmpz_vec_max_bits(a, len);
        _fmpz_vec_height(h, a, len);

        result = (fmpz_bits(h) == FLINT_ABS(bits2)) && (fmpz_sgn(h) >= 0);

        if (!result)
        {
            printf("FAIL:\n");
            printf("bits = %ld, bits2 = %ld\n", bits, bits2);
            printf("Computed height:\n");
            fmpz_print(h);
            printf("\n");
            abort();
        }

        fmpz_clear(h);
        _fmpz_vec_clear(a, len);
    }

    flint_randclear(state);
    _fmpz_cleanup();
    printf("PASS\n");
    return 0;
}
示例#15
0
void
acb_pow_arb(acb_t z, const acb_t x, const arb_t y, long prec)
{
    const arf_struct * ymid = arb_midref(y);
    const mag_struct * yrad = arb_radref(y);

    if (arb_is_zero(y))
    {
        acb_one(z);
        return;
    }

    if (mag_is_zero(yrad))
    {
        /* small half-integer or integer */
        if (arf_cmpabs_2exp_si(ymid, BINEXP_LIMIT) < 0 &&
            arf_is_int_2exp_si(ymid, -1))
        {
            fmpz_t e;
            fmpz_init(e);            

            if (arf_is_int(ymid))
            {
                arf_get_fmpz_fixed_si(e, ymid, 0);
                acb_pow_fmpz_binexp(z, x, e, prec);
            }
            else
            {
                /* hack: give something finite here (should fix sqrt/rsqrt etc) */
                if (arb_contains_zero(acb_imagref(x)) && arb_contains_nonpositive(acb_realref(x)))
                {
                    _acb_pow_arb_exp(z, x, y, prec);
                    fmpz_clear(e);
                    return;
                }

                arf_get_fmpz_fixed_si(e, ymid, -1);
                acb_sqrt(z, x, prec + fmpz_bits(e));
                acb_pow_fmpz_binexp(z, z, e, prec);
            }

            fmpz_clear(e);
            return;
        }
    }

    _acb_pow_arb_exp(z, x, y, prec);
}
示例#16
0
文件: exp.c 项目: clear731/lattice
void _qadic_exp(fmpz *rop, const fmpz *op, slong v, slong len, 
                           const fmpz *a, const slong *j, slong lena, 
                           const fmpz_t p, slong N, const fmpz_t pN)
{
    if (N < (WORD(1) << 13) / (slong) fmpz_bits(p))
    {
        _qadic_exp_rectangular(rop, op, v, len, a, j, lena, p, N, pN);
    }
    else
    {
        const slong d = j[lena - 1];

        _qadic_exp_balanced(rop, op, v, len, a, j, lena, p, N, pN);
        _fmpz_vec_zero(rop + d, d - 1);
    }
}
示例#17
0
long
_fmpz_vec_max_bits(const fmpz * vec, long len)
{
    long i, bits, max_bits = 0, sign = 1;

    for (i = 0; i < len; i++)
    {
        bits = fmpz_bits(vec + i);
        if (bits > max_bits)
            max_bits = bits;
        if (fmpz_sgn(vec + i) < 0)
            sign = -1L;
    }

    return max_bits * sign;
}
示例#18
0
void arb_from_interval(arb_t x, const fmpz_t c, const slong k, const slong prec)
{
    /* we build the ball that gives exactly (c 2^k, (c+1) 2^k) */
    /*  center: (2c+1) 2^(k-1) */
    /*  radius: 2^(k-1)        */
    if (prec <= 0 || prec < fmpz_bits(c) + 2)
    {
        fprintf(stderr, "not enough precision");
        abort();
    }

    arb_set_fmpz(x, c);
    arb_mul_2exp_si(x, x, 1);
    arb_add_si(x, x, 1, prec);
    arb_mul_2exp_si(x, x, k-1);
    arb_add_error_2exp_si(x, k-1);
}
示例#19
0
void
fmpr_pow_sloppy_fmpz(fmpr_t y, const fmpr_t b, const fmpz_t e,
    long prec, fmpr_rnd_t rnd)
{
    long i, wp, bits;

    if (fmpz_is_zero(e))
    {
        fmpr_set_ui(y, 1UL);
        return;
    }

    if (fmpz_sgn(e) < 0)
    {
        fmpz_t f;
        fmpz_init(f);
        fmpz_neg(f, e);
        fmpr_pow_sloppy_fmpz(y, b, f, prec + 2,
            (rnd == FMPR_RND_FLOOR || rnd == FMPR_RND_DOWN)
            ? FMPR_RND_UP : FMPR_RND_DOWN);
        fmpr_ui_div(y, 1UL, y, prec, rnd);
        fmpz_clear(f);
    }

    if (y == b)
    {
        fmpr_t t;
        fmpr_init(t);
        fmpr_set(t, b);
        fmpr_pow_sloppy_fmpz(y, t, e, prec, rnd);
        fmpr_clear(t);
        return;
    }

    fmpr_set(y, b);

    bits = fmpz_bits(e);
    wp = FMPR_PREC_ADD(prec, bits);

    for (i = bits - 2; i >= 0; i--)
    {
        fmpr_mul(y, y, y, wp, rnd);
        if (fmpz_tstbit(e, i))
            fmpr_mul(y, y, b, wp, rnd);
    }
}
示例#20
0
void
arb_bernoulli_fmpz(arb_t res, const fmpz_t n, slong prec)
{
    if (fmpz_cmp_ui(n, UWORD_MAX) <= 0)
    {
        if (fmpz_sgn(n) >= 0)
            arb_bernoulli_ui(res, fmpz_get_ui(n), prec);
        else
            arb_zero(res);
    }
    else if (fmpz_is_odd(n))
    {
        arb_zero(res);
    }
    else
    {
        arb_t t;
        slong wp;

        arb_init(t);
        wp = prec + 2 * fmpz_bits(n);

        /* zeta(n) ~= 1 */
        arf_one(arb_midref(res));
        mag_one(arb_radref(res));
        mag_mul_2exp_si(arb_radref(res), arb_radref(res), WORD_MIN);

        /* |B_n| = 2 * n! / (2*pi)^n * zeta(n) */
        arb_gamma_fmpz(t, n, wp);
        arb_mul_fmpz(t, t, n, wp);
        arb_mul(res, res, t, wp);

        arb_const_pi(t, wp);
        arb_mul_2exp_si(t, t, 1);
        arb_pow_fmpz(t, t, n, wp);

        arb_div(res, res, t, prec);
        arb_mul_2exp_si(res, res, 1);

        if (fmpz_fdiv_ui(n, 4) == 0)
            arb_neg(res, res);

        arb_clear(t);
    }
}
示例#21
0
void
fmpz_randtest_mod(fmpz_t f, flint_rand_t state, const fmpz_t m)
{
    fmpz_t t;

    fmpz_init(t);
    fmpz_randtest_unsigned(t, state, fmpz_bits(m) + 2);
    fmpz_mod(t, t, m);

    if (n_randlimb(state) & UWORD(1))
    {
        fmpz_sub(t, m, t);
        fmpz_sub_ui(t, t, UWORD(1));
    }

    fmpz_set(f, t);
    fmpz_clear(t);
}
示例#22
0
void
fmpz_poly_bit_unpack(fmpz_poly_t poly, const fmpz_t f, mp_bitcnt_t bit_size)
{
    slong len;
    mpz_t tmp;
    int negate, borrow;

    if (bit_size == 0 || fmpz_is_zero(f))
    {
        fmpz_poly_zero(poly);
        return;
    }

    /* Round up */
    len = (fmpz_bits(f) + bit_size - 1) / bit_size;
    negate = (fmpz_sgn(f) < 0) ? -1 : 0;

    mpz_init2(tmp, bit_size*len);

    /* TODO: avoid all this wastefulness */
    flint_mpn_zero(tmp->_mp_d, tmp->_mp_alloc);
    fmpz_get_mpz(tmp, f);

    fmpz_poly_fit_length(poly, len + 1);

    borrow = _fmpz_poly_bit_unpack(poly->coeffs, len,
                    tmp->_mp_d, bit_size, negate);

    if (borrow)
    {
        fmpz_set_si(poly->coeffs + len, negate ? WORD(-1) : WORD(1));
        _fmpz_poly_set_length(poly, len + 1);
    }
    else
    {
        _fmpz_poly_set_length(poly, len);
        _fmpz_poly_normalise(poly);
    }

    mpz_clear(tmp);
}
示例#23
0
int main(void)
{
   int i, j, result;
   ulong count = UWORD(0);
   gmp_randstate_t st;
   FLINT_TEST_INIT(state);
   gmp_randinit_default(st);
   

   flint_printf("factor_pp1....");
   fflush(stdout);

   for (i = 0; i < 50 * flint_test_multiplier(); i++) /* Test random numbers */
   {
      mp_bitcnt_t bits;
      mpz_t m, n;
      fmpz_t n1, n2, r;

      mpz_init(n);
      mpz_init(m);
      fmpz_init(n1);
      fmpz_init(n2);
      fmpz_init(r);

      do {
         mpz_urandomb(n, st, n_randint(state, 128) + 2); 
      } while (flint_mpz_cmp_ui(n, 2) < 0);
      do {
         mpz_urandomb(m, st, n_randint(state, 50) + 2); 
      } while (!mpz_probab_prime_p(m, 20));
      mpz_mul(n, n, m);

      fmpz_set_mpz(n1, n);
      bits = FLINT_MIN(fmpz_bits(n1), FLINT_BITS);

      for (j = 0; j < 20; j++)
      {
         fmpz_factor_pp1(n2, n1, 10000, 10000, n_randbits(state, bits - 2) + 3);
         if (fmpz_cmp_ui(n2, 1) > 0) break;
      }
      
      if (fmpz_cmp_ui(n2, 1) > 0)
      {
         count++;
         fmpz_mod(r, n1, n2);
         result = (fmpz_is_zero(r));
         if (!result)
         {
            flint_printf("FAIL:\n");
            flint_printf("n1 = ");
            fmpz_print(n1);
            flint_printf(", n2 = ");
            fmpz_print(n2);
            flint_printf("\n"); 
            fmpz_print(r); flint_printf("\n");
            abort();
         }
      }

      fmpz_clear(n1);
      fmpz_clear(n2);
      fmpz_clear(r);
      mpz_clear(m);
      mpz_clear(n);
   }
   
   if (count < 49 * flint_test_multiplier())
   {
      flint_printf("FAIL:\n");
      flint_printf("Only %wu numbers factored\n", count); 
      abort();
   }

   
   gmp_randclear(st);
   FLINT_TEST_CLEANUP(state);
   flint_printf("PASS\n");
   return 0;
}
示例#24
0
int
main(void)
{
    int i;
    FLINT_TEST_INIT(state);

    flint_printf("multi_CRT_ui....");
    fflush(stdout);

    

    for (i = 0; i < 1000 * flint_test_multiplier(); i++)
    {
        slong bits, prime_bits, rows, cols, num_primes, j;
        fmpz_t mod;
        fmpz_mat_t A, B, C;
        nmod_mat_t Amod[1000];
        mp_limb_t primes[1000];

        bits = n_randint(state, 500) + 1;
        rows = n_randint(state, 10);
        cols = n_randint(state, 10);
        prime_bits = 1 + n_randint(state, FLINT_BITS - 1);

        fmpz_mat_init(A, rows, cols);
        fmpz_mat_init(B, rows, cols);
        fmpz_mat_init(C, rows, cols);

        fmpz_mat_randtest(A, state, bits);

        fmpz_init(mod);
        num_primes = 0;
        primes[0] = n_nextprime(UWORD(1) << prime_bits, 0);
        fmpz_set_ui(mod, primes[0]);

        /* + 1 for sign */
        while (fmpz_bits(mod) <= bits + 1)
        {
            primes[num_primes + 1] = n_nextprime(primes[num_primes], 0);
            fmpz_mul_ui(mod, mod, primes[num_primes + 1]);
            num_primes++;
        }

        num_primes++;

        for (j = 0; j < num_primes; j++)
            nmod_mat_init(Amod[j], rows, cols, primes[j]);

        fmpz_mat_multi_mod_ui(Amod, num_primes, A);
        fmpz_mat_multi_CRT_ui(B, Amod, num_primes, 1);

        if (!fmpz_mat_equal(B, A))
        {
            flint_printf("FAIL!\n");
            flint_printf("primes: ");
            for (j = 0; j < num_primes; j++)
                flint_printf("%wu ", primes[j]);
            flint_printf("\nA: \n");
            fmpz_mat_print_pretty(A);
            flint_printf("\nB: \n");
            fmpz_mat_print_pretty(B);
            flint_printf("\n");
            abort();
        }

        for (j = 0; j < num_primes; j++)
            nmod_mat_clear(Amod[j]);
        fmpz_mat_clear(A);
        fmpz_mat_clear(B);
        fmpz_mat_clear(C);
        fmpz_clear(mod);
    }

    FLINT_TEST_CLEANUP(state);
    
    flint_printf("PASS\n");
    return 0;
}
示例#25
0
int main()
{
    slong iter, iter2;
    flint_rand_t state;

    flint_printf("addmul_si....");
    fflush(stdout);

    flint_randinit(state);

    for (iter = 0; iter < 1000 * arb_test_multiplier(); iter++)
    {
        arf_t x, z, v;
        slong y;
        slong prec, r1, r2;
        arf_rnd_t rnd;

        arf_init(x);
        arf_init(z);
        arf_init(v);

        for (iter2 = 0; iter2 < 100; iter2++)
        {
            arf_randtest_special(x, state, 2000, 100);
            y = z_randtest(state);
            arf_randtest_special(z, state, 2000, 100);
            arf_set(v, z);

            prec = 2 + n_randint(state, 2000);

            if (n_randint(state, 10) == 0 &&
                fmpz_bits(ARF_EXPREF(x)) < 10 &&
                fmpz_bits(ARF_EXPREF(z)) < 10)
            {
                prec = ARF_PREC_EXACT;
            }

            switch (n_randint(state, 5))
            {
                case 0:  rnd = ARF_RND_DOWN; break;
                case 1:  rnd = ARF_RND_UP; break;
                case 2:  rnd = ARF_RND_FLOOR; break;
                case 3:  rnd = ARF_RND_CEIL; break;
                default: rnd = ARF_RND_NEAR; break;
            }

            switch (n_randint(state, 2))
            {
            case 0:
                r1 = arf_addmul_si(z, x, y, prec, rnd);
                r2 = arf_addmul_si_naive(v, x, y, prec, rnd);
                if (!arf_equal(z, v) || r1 != r2)
                {
                    flint_printf("FAIL!\n");
                    flint_printf("prec = %wd, rnd = %d\n\n", prec, rnd);
                    flint_printf("x = "); arf_print(x); flint_printf("\n\n");
                    flint_printf("y = %wd", y); flint_printf("\n\n");
                    flint_printf("z = "); arf_debug(z); flint_printf("\n\n");
                    flint_printf("v = "); arf_debug(v); flint_printf("\n\n");
                    flint_printf("r1 = %wd, r2 = %wd\n", r1, r2);
                    abort();
                }
                break;

            default:
                r2 = arf_addmul_si_naive(v, v, y, prec, rnd);
                r1 = arf_addmul_si(z, z, y, prec, rnd);
                if (!arf_equal(v, z) || r1 != r2)
                {
                    flint_printf("FAIL (aliasing)!\n");
                    flint_printf("prec = %wd, rnd = %d\n\n", prec, rnd);
                    flint_printf("y = %wd", y); flint_printf("\n\n");
                    flint_printf("v = "); arf_print(v); flint_printf("\n\n");
                    flint_printf("z = "); arf_print(z); flint_printf("\n\n");
                    flint_printf("r1 = %wd, r2 = %wd\n", r1, r2);
                    abort();
                }
                break;
            }
        }

        arf_clear(x);
        arf_clear(z);
        arf_clear(v);
    }

    flint_randclear(state);
    flint_cleanup();
    flint_printf("PASS\n");
    return EXIT_SUCCESS;
}
示例#26
0
文件: t-add.c 项目: argriffing/arb
int main()
{
    slong iter;
    flint_rand_t state;

    flint_printf("add....");
    fflush(stdout);

    flint_randinit(state);

    /* test exact addition: (x + y) + z == x + (y + z) */
    for (iter = 0; iter < 100000 * arb_test_multiplier(); iter++)
    {
        slong bits, res1, res2, res3, res4;
        fmpr_t x, y, z, t, u;

        bits = 2 + n_randint(state, 200);

        fmpr_init(x);
        fmpr_init(y);
        fmpr_init(z);
        fmpr_init(t);
        fmpr_init(u);

        fmpr_randtest_special(x, state, bits, 10);
        fmpr_randtest_special(y, state, bits, 10);
        fmpr_randtest_special(z, state, bits, 10);
        fmpr_randtest_special(t, state, bits, 10);
        fmpr_randtest_special(u, state, bits, 10);

        res1 = fmpr_add(t, x, y, FMPR_PREC_EXACT, FMPR_RND_DOWN);
        res2 = fmpr_add(t, t, z, FMPR_PREC_EXACT, FMPR_RND_DOWN);
        res3 = fmpr_add(u, y, z, FMPR_PREC_EXACT, FMPR_RND_DOWN);
        res4 = fmpr_add(u, x, u, FMPR_PREC_EXACT, FMPR_RND_DOWN);

        if (!fmpr_equal(t, u) ||
            res1 != FMPR_RESULT_EXACT || res2 != FMPR_RESULT_EXACT ||
            res3 != FMPR_RESULT_EXACT || res4 != FMPR_RESULT_EXACT)
        {
            flint_printf("FAIL\n\n");
            flint_printf("bits = %wd\n", bits);
            flint_printf("x = "); fmpr_print(x); flint_printf("\n\n");
            flint_printf("y = "); fmpr_print(y); flint_printf("\n\n");
            flint_printf("z = "); fmpr_print(z); flint_printf("\n\n");
            flint_printf("t = "); fmpr_print(t); flint_printf("\n\n");
            flint_printf("u = "); fmpr_print(u); flint_printf("\n\n");
            abort();
        }

        fmpr_clear(x);
        fmpr_clear(y);
        fmpr_clear(z);
        fmpr_clear(t);
        fmpr_clear(u);
    }

    /* compare with add_naive */
    for (iter = 0; iter < 1000000 * arb_test_multiplier(); iter++)
    {
        slong prec, ret1, ret2;
        fmpr_t x, y, z, w;
        fmpr_rnd_t rnd;

        fmpr_init(x);
        fmpr_init(y);
        fmpr_init(z);
        fmpr_init(w);

        fmpr_randtest_special(x, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 200));
        fmpr_randtest_special(y, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 200));
        fmpr_randtest_special(z, state, 1 + n_randint(state, 1000), 1 + n_randint(state, 200));

        prec = 2 + n_randint(state, 1000);
        if (n_randint(state, 10) == 0 &&
                fmpz_bits(fmpr_expref(x)) < 10 &&
                fmpz_bits(fmpr_expref(y)) < 10)
            prec = FMPR_PREC_EXACT;

        switch (n_randint(state, 4))
        {
            case 0: rnd = FMPR_RND_DOWN; break;
            case 1: rnd = FMPR_RND_UP; break;
            case 2: rnd = FMPR_RND_FLOOR; break;
            default: rnd = FMPR_RND_CEIL; break;
        }

        ret1 = fmpr_add(z, x, y, prec, rnd);
        ret2 = fmpr_add_naive(w, x, y, prec, rnd);

        if (!fmpr_equal(z, w) || ret1 != ret2 ||
            !fmpr_check_ulp(z, ret1, prec) || !fmpr_check_ulp(w, ret2, prec))
        {
            flint_printf("FAIL\n\n");
            flint_printf("iter %wd\n", iter);
            flint_printf("prec = %wd\n", prec);
            flint_printf("x = "); fmpr_print(x); flint_printf("\n\n");
            flint_printf("y = "); fmpr_print(y); flint_printf("\n\n");
            flint_printf("z = "); fmpr_print(z); flint_printf("\n\n");
            flint_printf("w = "); fmpr_print(w); flint_printf("\n\n");
            flint_printf("ret1 = %wd, ret2 = %wd\n", ret1, ret2);
            abort();
        }

        fmpr_clear(x);
        fmpr_clear(y);
        fmpr_clear(z);
        fmpr_clear(w);
    }

    /* compare rounding with mpfr */
    for (iter = 0; iter < 1000000 * arb_test_multiplier(); iter++)
    {
        slong bits, res;
        int mpfr_res;
        fmpr_t x, y, z, w;
        mpfr_t X, Y, Z;

        bits = 2 + n_randint(state, 500);

        fmpr_init(x);
        fmpr_init(y);
        fmpr_init(z);
        fmpr_init(w);

        mpfr_init2(X, bits + 500);
        mpfr_init2(Y, bits + 500);
        mpfr_init2(Z, bits);

        fmpr_randtest_special(x, state, bits + n_randint(state, 500), 10);
        fmpr_randtest_special(y, state, bits + n_randint(state, 500), 10);
        fmpr_randtest_special(z, state, bits, 10);

        fmpr_get_mpfr(X, x, MPFR_RNDN);
        fmpr_get_mpfr(Y, y, MPFR_RNDN);

        switch (n_randint(state, 4))
        {
            case 0:
                mpfr_res = mpfr_add(Z, X, Y, MPFR_RNDZ);
                res = fmpr_add(z, x, y, bits, FMPR_RND_DOWN);
                break;
            case 1:
                mpfr_res = mpfr_add(Z, X, Y, MPFR_RNDA);
                res = fmpr_add(z, x, y, bits, FMPR_RND_UP);
                break;
            case 2:
                mpfr_res = mpfr_add(Z, X, Y, MPFR_RNDD);
                res = fmpr_add(z, x, y, bits, FMPR_RND_FLOOR);
                break;
            default:
                mpfr_res = mpfr_add(Z, X, Y, MPFR_RNDU);
                res = fmpr_add(z, x, y, bits, FMPR_RND_CEIL);
                break;
        }

        fmpr_set_mpfr(w, Z);

        if (!fmpr_equal(z, w) || (res == FMPR_RESULT_EXACT) != (mpfr_res == 0)
            || !fmpr_check_ulp(z, res, bits))
        {
            flint_printf("FAIL\n\n");
            flint_printf("iter %wd\n", iter);
            flint_printf("bits = %wd\n", bits);
            flint_printf("x = "); fmpr_print(x); flint_printf("\n\n");
            flint_printf("y = "); fmpr_print(y); flint_printf("\n\n");
            flint_printf("z = "); fmpr_print(z); flint_printf("\n\n");
            flint_printf("w = "); fmpr_print(w); flint_printf("\n\n");
            flint_printf("returned: %wd, %d\n", res, mpfr_res);
            abort();
        }

        /* check error bound */
        if (!fmpr_is_nan(z) && !fmpr_is_inf(z))
        {
            fmpr_t z_exact, error_bound, true_error;

            fmpr_init(z_exact);
            fmpr_init(error_bound);
            fmpr_init(true_error);

            fmpr_set_error_result(error_bound, z, res);
            fmpr_add(z_exact, x, y, FMPR_PREC_EXACT, FMPR_RND_DOWN);

            fmpr_sub(true_error, z, z_exact, FMPR_PREC_EXACT, FMPR_RND_DOWN);
            fmpr_abs(true_error, true_error);

            if (fmpr_is_zero(error_bound) != fmpr_is_zero(true_error) ||
                fmpr_cmp(true_error, error_bound) > 0)
            {
                flint_printf("FAIL: error bound\n\n");
                flint_printf("bits = %wd\n", bits);
                flint_printf("x = "); fmpr_print(x); flint_printf("\n\n");
                flint_printf("y = "); fmpr_print(y); flint_printf("\n\n");
                flint_printf("z = "); fmpr_print(z); flint_printf("\n\n");
                flint_printf("z_exact = "); fmpr_print(z_exact); flint_printf("\n\n");
                flint_printf("true_error = "); fmpr_print(true_error); flint_printf("\n\n");
                flint_printf("error_bound = "); fmpr_print(error_bound); flint_printf("\n\n");
                abort();
            }

            fmpr_clear(z_exact);
            fmpr_clear(error_bound);
            fmpr_clear(true_error);
        }

        fmpr_clear(x);
        fmpr_clear(y);
        fmpr_clear(z);
        fmpr_clear(w);

        mpfr_clear(X);
        mpfr_clear(Y);
        mpfr_clear(Z);
    }

    flint_randclear(state);
    flint_cleanup();
    flint_printf("PASS\n");
    return EXIT_SUCCESS;
}
示例#27
0
文件: gamma.c 项目: jwbober/arb
static void
_fmprb_gamma(fmprb_t y, const fmprb_t x, long prec, int inverse)
{
    int reflect;
    long r, n, wp;
    fmprb_t t, u, v;

    if (fmprb_is_exact(x))
    {
        const fmpr_struct * mid = fmprb_midref(x);

        if (fmpr_is_special(mid))
        {
            if (!inverse && fmpr_is_pos_inf(mid))
            {
                fmprb_set(y, x);
            }
            else if (fmpr_is_nan(mid) || fmpr_is_neg_inf(mid) || !inverse)
            {
                fmpr_nan(fmprb_midref(y));
                fmpr_pos_inf(fmprb_radref(y));
            }
            else
            {
                fmprb_zero(y);
            }
            return;
        }
        else
        {
            const fmpz exp = *fmpr_expref(mid);
            const fmpz man = *fmpr_manref(mid);

            /* fast gamma(n), gamma(n/2) or gamma(n/4) */
            if (!COEFF_IS_MPZ(exp) && (exp >= -2) &&
                ((double) fmpz_bits(&man) + exp < prec))
            {
                fmpq_t a;
                fmpq_init(a);
                fmpr_get_fmpq(a, mid);
                fmprb_gamma_fmpq(y, a, prec + 2 * inverse);
                if (inverse)
                    fmprb_ui_div(y, 1, y, prec);
                fmpq_clear(a);
                return;
            }
        }
    }

    wp = prec + FLINT_BIT_COUNT(prec);

    gamma_stirling_choose_param_fmprb(&reflect, &r, &n, x, 1, 0, wp);

    fmprb_init(t);
    fmprb_init(u);
    fmprb_init(v);

    if (reflect)
    {
        /* gamma(x) = (rf(1-x, r) * pi) / (gamma(1-x+r) sin(pi x)) */
        fmprb_sub_ui(t, x, 1, wp);
        fmprb_neg(t, t);
        gamma_rising_fmprb_ui_bsplit(u, t, r, wp);
        fmprb_const_pi(v, wp);
        fmprb_mul(u, u, v, wp);
        fmprb_add_ui(t, t, r, wp);
        gamma_stirling_eval_fmprb(v, t, n, 0, wp);
        fmprb_exp(v, v, wp);
        fmprb_sin_pi(t, x, wp);
        fmprb_mul(v, v, t, wp);
    }
    else
    {
        /* gamma(x) = gamma(x+r) / rf(x,r) */
        fmprb_add_ui(t, x, r, wp);
        gamma_stirling_eval_fmprb(u, t, n, 0, wp);
        fmprb_exp(u, u, prec);
        gamma_rising_fmprb_ui_bsplit(v, x, r, wp);
    }

    if (inverse)
        fmprb_div(y, v, u, prec);
    else
        fmprb_div(y, u, v, prec);

    fmprb_clear(t);
    fmprb_clear(u);
    fmprb_clear(v);
}
示例#28
0
int
main(void)
{
    int i, result;
    FLINT_TEST_INIT(state);

    flint_printf("resultant_div....");
    fflush(stdout);

    for (i = 0; i < 50; i++)
    {
        fmpq_poly_t f, g, h, p;
        fmpq_t x, y, z, zz;
        fmpz_t den;
        slong nbits;

        fmpq_poly_init(f);
        fmpq_poly_init(g);
        fmpq_poly_init(p);
        fmpq_poly_init(h);

        fmpq_init(x);
        fmpq_init(y);
        fmpq_init(z);
        fmpq_init(zz);
        
        fmpz_init(den);

        fmpq_poly_randtest(f, state, n_randint(state, 50), 100);
        fmpq_poly_randtest(g, state, n_randint(state, 50), 100);
        fmpq_poly_randtest(h, state, n_randint(state, 50), 100);

        fmpz_set(den, fmpq_poly_denref(f));
        fmpq_poly_scalar_mul_fmpz(f, f, den);

        fmpz_set(den, fmpq_poly_denref(g));
        fmpq_poly_scalar_mul_fmpz(g, g, den);

        fmpz_set(den, fmpq_poly_denref(h));
        fmpq_poly_scalar_mul_fmpz(h, h, den);

        fmpq_poly_mul(p, f, g);

        fmpq_poly_resultant(x, f, h);
        
        if (!fmpz_is_one(fmpq_denref(x)))
        {
            flint_printf("FAIL resultant not integral\n");
            flint_printf("f = "), fmpq_poly_print(f), flint_printf("\n\n");
            flint_printf("g = "), fmpq_poly_print(g), flint_printf("\n\n");
            flint_printf("y = "), fmpq_print(y), flint_printf("\n\n");
            abort();
        }

        fmpq_poly_resultant(y, g, h);
        
        if (!fmpz_is_one(fmpq_denref(y)))
        {
            flint_printf("FAIL resultant not integral\n");
            flint_printf("h = "), fmpq_poly_print(f), flint_printf("\n\n");
            flint_printf("g = "), fmpq_poly_print(g), flint_printf("\n\n");
            flint_printf("z = "), fmpq_print(y), flint_printf("\n\n");
            abort();
        }

        fmpq_poly_resultant(z, p, h);

        if (!fmpz_is_one(fmpq_denref(z)))
        {
            flint_printf("FAIL resultant not integral\n");
            flint_printf("p = "), fmpq_poly_print(f), flint_printf("\n\n");
            flint_printf("g = "), fmpq_poly_print(g), flint_printf("\n\n");
            flint_printf("y = "), fmpq_print(y), flint_printf("\n\n");
            abort();
        }

        if (fmpq_is_zero(z)) 
        {
            fmpq_poly_clear(f);
            fmpq_poly_clear(g);
            fmpq_poly_clear(h);
            fmpq_poly_clear(p);

            fmpq_clear(x);
            fmpq_clear(y);
            fmpq_clear(z);
            fmpq_clear(zz);
        
            fmpz_clear(den);
            continue;
        }
    
        nbits = (slong)fmpz_bits(fmpq_numref(y)) + 1;

        fmpq_poly_resultant_div(z, p, h, fmpq_numref(x), nbits);
        fmpq_poly_resultant(zz, p, h);

        result = fmpq_equal(z, y);
        
        if (!result)
        {
            flint_printf("FAIL (res(p, g)/div == res(p, g)/div:\n");
            flint_printf("p = "), fmpq_poly_print_pretty(p, "x"), flint_printf("\n\n");
            flint_printf("h = "), fmpq_poly_print_pretty(h, "x"), flint_printf("\n\n");
            flint_printf("res(p, h) = "), fmpq_print(zz), flint_printf("\n\n");
            flint_printf("res(p, h) = "), fmpq_print(x), flint_printf(" * "), fmpq_print(y), flint_printf("\n\n");
            flint_printf("supplied divisor = "), fmpq_print(x), flint_printf("\n\n");
            flint_printf("nbits = %wu\n\n", nbits);
            flint_printf("divisor found = "), fmpq_print(z), flint_printf("\n\n");
            flint_printf("correct result = "), fmpq_print(y), flint_printf("\n\n");
            abort();
        }
        
        fmpq_poly_clear(f);
        fmpq_poly_clear(g);
        fmpq_poly_clear(h);
        fmpq_poly_clear(p);

        fmpq_clear(x);
        fmpq_clear(y);
        fmpq_clear(z);
        fmpq_clear(zz);
        
        fmpz_clear(den);
    }

    FLINT_TEST_CLEANUP(state);
    
    flint_printf("PASS\n");
    return 0;
}
示例#29
0
void
acb_pow_fmpz_binexp(acb_t y, const acb_t b, const fmpz_t e, long prec)
{
    long i, wp, bits;

    if (-2L <= *e && *e <= 4L)
    {
        if (*e == 0L)
        {
            acb_one(y);
        }
        else if (*e == 1L)
        {
            acb_set_round(y, b, prec);
        }
        else if (*e == -1L)
        {
            acb_inv(y, b, prec);
        }
        else if (*e == 2L)
        {
            acb_mul(y, b, b, prec);
        }
        else if (*e == 3L)
        {
            acb_cube(y, b, prec);
        }
        else if (*e == 4L)
        {
            acb_mul(y, b, b, prec);
            acb_mul(y, y, y, prec);
        }
        else
        {
            acb_inv(y, b, prec);
            acb_mul(y, y, y, prec);
        }
        return;
    }

    if (fmpz_sgn(e) < 0)
    {
        fmpz_t f;
        fmpz_init(f);
        fmpz_neg(f, e);
        acb_pow_fmpz_binexp(y, b, f, prec + 2);
        acb_inv(y, y, prec);
        fmpz_clear(f);
        return;
    }

    if (!COEFF_IS_MPZ(*e) && ((*e) % 3 == 0))
    {
        fmpz e3 = (*e) / 3;
        acb_pow_fmpz_binexp(y, b, &e3, prec);
        acb_cube(y, y, prec);
        return;
    }

    if (y == b)
    {
        acb_t t;
        acb_init(t);
        acb_set(t, b);
        acb_pow_fmpz_binexp(y, t, e, prec);
        acb_clear(t);
        return;
    }

    acb_set(y, b);

    bits = fmpz_bits(e);
    wp = ARF_PREC_ADD(prec, bits);

    for (i = bits - 2; i >= 0; i--)
    {
        acb_mul(y, y, y, wp);
        if (fmpz_tstbit(e, i))
            acb_mul(y, y, b, wp);
    }
}
示例#30
0
文件: pow.c 项目: clear731/lattice
void _fq_nmod_pow(mp_limb_t *rop, const mp_limb_t *op, slong len, const fmpz_t e, 
                  const fq_nmod_ctx_t ctx)
{
    const slong d = fq_nmod_ctx_degree(ctx);

    if (fmpz_is_zero(e))
    {
        rop[0] = WORD(1);
        _nmod_vec_zero(rop + 1, 2 * d - 1 - 1);
    }
    else if (fmpz_is_one(e))
    {
        _nmod_vec_set(rop, op, len);
        _nmod_vec_zero(rop + len, 2 * d - 1 - len);
    }
    else
    {
        ulong bit;
        mp_limb_t *v = _nmod_vec_init(2 * d - 1);
        mp_limb_t *R, *S, *T;

        _nmod_vec_zero(v, 2 * d - 1);
        _nmod_vec_zero(rop, 2 * d - 1);

        /*
           Set bits to the bitmask with a 1 one place lower than the msb of e
         */

        bit = fmpz_bits(e) - 2;

        /*
           Trial run without any polynomial arithmetic to determine the parity 
           of the number of swaps;  then set R and S accordingly
         */
        
        {
            unsigned int swaps = 0U;
            ulong bit2 = bit;
            if (fmpz_tstbit(e, bit2))
                swaps = ~swaps;
            while (bit2--)
                if (!fmpz_tstbit(e, bit2))
                    swaps = ~swaps;
            
            if (swaps == 0U)
            {
                R = rop;
                S = v;
            }
            else
            {
                R = v;
                S = rop;
            }
        }
        
        /*
           We unroll the first step of the loop, referring to {op, len}
         */

        _nmod_poly_mul(R, op, len, op, len, ctx->mod);
        _fq_nmod_reduce(R, 2 * len - 1, ctx);

        if (fmpz_tstbit(e, bit))
        {
            _nmod_poly_mul(S, R, d, op, len, ctx->mod);
            _fq_nmod_reduce(S, d + len - 1, ctx);
            T = R;
            R = S;
            S = T;
        }

        while (bit--)
        {
            if (fmpz_tstbit(e, bit))
            {
                _nmod_poly_mul(S, R, d, R, d, ctx->mod);
                _fq_nmod_reduce(S, 2 * d - 1, ctx);
                _nmod_poly_mul(R, S, d, op, len, ctx->mod);
                _fq_nmod_reduce(R, d + len - 1, ctx);
            }
            else
            {
                _nmod_poly_mul(S, R, d, R, d, ctx->mod);
                _fq_nmod_reduce(S, 2 * d - 1, ctx);
                T = R;
                R = S;
                S = T;
            }
        }

        _nmod_vec_clear(v);
    }
}