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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
348 lines
9.0 KiB
C
348 lines
9.0 KiB
C
/* Internal function for converting integers to ASCII.
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Copyright (C) 1994-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <gmp-mparam.h>
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#include <gmp.h>
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#include <limits.h>
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#include <stdlib/gmp-impl.h>
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#include <stdlib/longlong.h>
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#include <_itowa.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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/* To reduce the memory needed we include some fields of the tables
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only conditionally. */
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#if UDIV_TIME > 2 * UMUL_TIME
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# define SEL1(X) X,
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# define SEL2(X) ,X
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#else
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# define SEL1(X)
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# define SEL2(X)
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#endif
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/* Factor table for the different bases. */
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extern const struct base_table_t _itoa_base_table[] attribute_hidden;
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/* Lower-case digits. */
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extern const wchar_t _itowa_lower_digits[] attribute_hidden;
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/* Upper-case digits. */
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extern const wchar_t _itowa_upper_digits[] attribute_hidden;
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#if _ITOA_NEEDED
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wchar_t *
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_itowa (unsigned long long int value, wchar_t *buflim, unsigned int base,
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int upper_case)
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{
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const wchar_t *digits = (upper_case
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? _itowa_upper_digits : _itowa_lower_digits);
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wchar_t *bp = buflim;
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const struct base_table_t *brec = &_itoa_base_table[base - 2];
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switch (base)
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{
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# define RUN_2N(BITS) \
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do \
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{ \
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/* `unsigned long long int' always has 64 bits. */ \
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mp_limb_t work_hi = value >> (64 - BITS_PER_MP_LIMB); \
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\
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if (BITS_PER_MP_LIMB == 32) \
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{ \
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if (work_hi != 0) \
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{ \
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mp_limb_t work_lo; \
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int cnt; \
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\
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work_lo = value & 0xfffffffful; \
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for (cnt = BITS_PER_MP_LIMB / BITS; cnt > 0; --cnt) \
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{ \
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*--bp = digits[work_lo & ((1ul << BITS) - 1)]; \
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work_lo >>= BITS; \
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} \
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if (BITS_PER_MP_LIMB % BITS != 0) \
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{ \
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work_lo \
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|= ((work_hi \
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& ((1 << (BITS - BITS_PER_MP_LIMB%BITS)) \
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- 1)) \
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<< BITS_PER_MP_LIMB % BITS); \
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work_hi >>= BITS - BITS_PER_MP_LIMB % BITS; \
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if (work_hi == 0) \
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work_hi = work_lo; \
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else \
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*--bp = digits[work_lo]; \
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} \
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} \
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else \
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work_hi = value & 0xfffffffful; \
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} \
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do \
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{ \
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*--bp = digits[work_hi & ((1 << BITS) - 1)]; \
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work_hi >>= BITS; \
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} \
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while (work_hi != 0); \
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} \
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while (0)
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case 8:
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RUN_2N (3);
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break;
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case 16:
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RUN_2N (4);
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break;
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default:
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{
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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)
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while (value != 0)
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{
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mp_limb_t quo, rem, x;
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mp_limb_t dummy __attribute__ ((unused));
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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 * base;
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*--bp = digits[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;
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mp_limb_t dummy __attribute__ ((unused));
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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 * base;
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*--bp = digits[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;
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mp_limb_t dummy __attribute__ ((unused));
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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 * base;
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*--bp = digits[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, x;
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mp_limb_t dummy __attribute__ ((unused));
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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 * base;
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*--bp = digits[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 / base;
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rem = ti % base;
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*--bp = digits[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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*--bp = '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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}
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break;
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}
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return bp;
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}
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#endif
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