267 lines
6.9 KiB
C
267 lines
6.9 KiB
C
/* Internal function for converting integers to string using locale
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specific digits.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <gmp-mparam.h>
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#include <stdlib/gmp.h>
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#include <stdlib/gmp-impl.h>
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#include <stdlib/longlong.h>
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#include "_i18n_itoa.h"
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/* Canonize environment. For some architectures not all values might
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be defined in the GMP header files. */
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#ifndef UMUL_TIME
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# define UMUL_TIME 1
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#endif
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#ifndef UDIV_TIME
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# define UDIV_TIME 3
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#endif
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/* Control memory layout. */
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#ifdef PACK
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# undef PACK
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# define PACK __attribute__ ((packed))
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#else
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# define PACK
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#endif
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/* Declare local types. */
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struct base_table_t
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{
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#if (UDIV_TIME > 2 * UMUL_TIME)
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mp_limb_t base_multiplier;
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#endif
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char flag;
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char post_shift;
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#if BITS_PER_MP_LIMB == 32
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struct
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{
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char normalization_steps;
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char ndigits;
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mp_limb_t base PACK;
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#if UDIV_TIME > 2 * UMUL_TIME
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mp_limb_t base_ninv PACK;
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#endif
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} big;
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#endif
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};
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/* Variable in other file. */
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extern const struct base_table_t _itoa_base_table[];
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char *
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_i18n_itoa (value, buflim)
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unsigned long long int value;
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char *buflim;
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{
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const struct base_table_t *brec = &_itoa_base_table[8];
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#if BITS_PER_MP_LIMB == 64
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mp_limb_t base_multiplier = brec->base_multiplier;
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if (brec->flag) while (value != 0)
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{
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mp_limb_t quo, rem, x, dummy;
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umul_ppmm (x, dummy, value, base_multiplier);
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quo = (x + ((value - x) >> 1)) >> (brec->post_shift - 1);
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rem = value - quo * 10;
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buflim = outdigit_value (buflim, rem);
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value = quo;
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}
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else
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while (value != 0)
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{
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mp_limb_t quo, rem, x, dummy;
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umul_ppmm (x, dummy, value, base_multiplier);
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quo = x >> brec->post_shift;
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rem = value - quo * 10;
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buflim = outdigit_value (buflim, rem);
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value = quo;
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}
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#endif
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#if BITS_PER_MP_LIMB == 32
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mp_limb_t t[3];
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int n;
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/* First convert x0 to 1-3 words in base s->big.base.
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Optimize for frequent cases of 32 bit numbers. */
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if ((mp_limb_t) (value >> 32) >= 1)
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{
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#if UDIV_TIME > 2 * UMUL_TIME || UDIV_NEEDS_NORMALIZATION
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int big_normalization_steps = brec->big.normalization_steps;
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mp_limb_t big_base_norm
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= brec->big.base << big_normalization_steps;
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#endif
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if ((mp_limb_t) (value >> 32) >= brec->big.base)
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{
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mp_limb_t x1hi, x1lo, r;
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/* If you want to optimize this, take advantage of
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that the quotient in the first udiv_qrnnd will
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always be very small. It might be faster just to
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subtract in a tight loop. */
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#if UDIV_TIME > 2 * UMUL_TIME
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mp_limb_t x, xh, xl;
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if (big_normalization_steps == 0)
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xh = 0;
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else
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xh = (mp_limb_t) (value >> (64 - big_normalization_steps));
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xl = (mp_limb_t) (value >> (32 - big_normalization_steps));
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udiv_qrnnd_preinv (x1hi, r, xh, xl, big_base_norm,
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brec->big.base_ninv);
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xl = ((mp_limb_t) value) << big_normalization_steps;
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udiv_qrnnd_preinv (x1lo, x, r, xl, big_base_norm,
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brec->big.base_ninv);
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t[2] = x >> big_normalization_steps;
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if (big_normalization_steps == 0)
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xh = x1hi;
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else
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xh = ((x1hi << big_normalization_steps)
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| (x1lo >> (32 - big_normalization_steps)));
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xl = x1lo << big_normalization_steps;
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udiv_qrnnd_preinv (t[0], x, xh, xl, big_base_norm,
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brec->big.base_ninv);
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t[1] = x >> big_normalization_steps;
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#elif UDIV_NEEDS_NORMALIZATION
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mp_limb_t x, xh, xl;
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if (big_normalization_steps == 0)
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xh = 0;
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else
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xh = (mp_limb_t) (value >> 64 - big_normalization_steps);
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xl = (mp_limb_t) (value >> 32 - big_normalization_steps);
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udiv_qrnnd (x1hi, r, xh, xl, big_base_norm);
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xl = ((mp_limb_t) value) << big_normalization_steps;
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udiv_qrnnd (x1lo, x, r, xl, big_base_norm);
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t[2] = x >> big_normalization_steps;
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if (big_normalization_steps == 0)
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xh = x1hi;
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else
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xh = ((x1hi << big_normalization_steps)
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| (x1lo >> 32 - big_normalization_steps));
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xl = x1lo << big_normalization_steps;
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udiv_qrnnd (t[0], x, xh, xl, big_base_norm);
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t[1] = x >> big_normalization_steps;
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#else
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udiv_qrnnd (x1hi, r, 0, (mp_limb_t) (value >> 32),
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brec->big.base);
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udiv_qrnnd (x1lo, t[2], r, (mp_limb_t) value, brec->big.base);
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udiv_qrnnd (t[0], t[1], x1hi, x1lo, brec->big.base);
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#endif
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n = 3;
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}
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else
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{
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#if (UDIV_TIME > 2 * UMUL_TIME)
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mp_limb_t x;
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value <<= brec->big.normalization_steps;
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udiv_qrnnd_preinv (t[0], x, (mp_limb_t) (value >> 32),
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(mp_limb_t) value, big_base_norm,
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brec->big.base_ninv);
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t[1] = x >> brec->big.normalization_steps;
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#elif UDIV_NEEDS_NORMALIZATION
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mp_limb_t x;
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value <<= big_normalization_steps;
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udiv_qrnnd (t[0], x, (mp_limb_t) (value >> 32),
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(mp_limb_t) value, big_base_norm);
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t[1] = x >> big_normalization_steps;
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#else
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udiv_qrnnd (t[0], t[1], (mp_limb_t) (value >> 32),
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(mp_limb_t) value, brec->big.base);
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#endif
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n = 2;
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}
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}
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else
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{
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t[0] = value;
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n = 1;
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}
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/* Convert the 1-3 words in t[], word by word, to ASCII. */
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do
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{
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mp_limb_t ti = t[--n];
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int ndig_for_this_limb = 0;
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#if UDIV_TIME > 2 * UMUL_TIME
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mp_limb_t base_multiplier = brec->base_multiplier;
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if (brec->flag)
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while (ti != 0)
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{
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mp_limb_t quo, rem, x, dummy;
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umul_ppmm (x, dummy, ti, base_multiplier);
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quo = (x + ((ti - x) >> 1)) >> (brec->post_shift - 1);
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rem = ti - quo * 10;
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buflim = outdigit_value (buflim, rem);
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ti = quo;
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++ndig_for_this_limb;
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} else
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while (ti != 0)
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{
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mp_limb_t quo, rem, x, dummy;
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umul_ppmm (x, dummy, ti, base_multiplier);
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quo = x >> brec->post_shift;
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rem = ti - quo * 10;
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buflim = outdigit_value (buflim, rem);
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ti = quo;
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++ndig_for_this_limb;
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}
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#else
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while (ti != 0)
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{
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mp_limb_t quo, rem;
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quo = ti / 10;
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rem = ti % 10;
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buflim = outdigit_value (buflim, rem);
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ti = quo;
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++ndig_for_this_limb;
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}
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#endif
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/* If this wasn't the most significant word, pad with zeros. */
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if (n != 0)
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while (ndig_for_this_limb < brec->big.ndigits)
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{
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*--buflim = '0';
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++ndig_for_this_limb;
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}
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}
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while (n != 0);
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#endif
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return buflim;
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}
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