| /* Internal function for converting integers to ASCII. |
| Copyright (C) 1994-2016 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Torbjorn Granlund <tege@matematik.su.se> |
| and Ulrich Drepper <drepper@gnu.org>. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <gmp-mparam.h> |
| #include <gmp.h> |
| #include <limits.h> |
| #include <stdlib/gmp-impl.h> |
| #include <stdlib/longlong.h> |
| |
| #include <_itowa.h> |
| |
| |
| /* Canonize environment. For some architectures not all values might |
| be defined in the GMP header files. */ |
| #ifndef UMUL_TIME |
| # define UMUL_TIME 1 |
| #endif |
| #ifndef UDIV_TIME |
| # define UDIV_TIME 3 |
| #endif |
| |
| /* Control memory layout. */ |
| #ifdef PACK |
| # undef PACK |
| # define PACK __attribute__ ((packed)) |
| #else |
| # define PACK |
| #endif |
| |
| |
| /* Declare local types. */ |
| struct base_table_t |
| { |
| #if (UDIV_TIME > 2 * UMUL_TIME) |
| mp_limb_t base_multiplier; |
| #endif |
| char flag; |
| char post_shift; |
| #if BITS_PER_MP_LIMB == 32 |
| struct |
| { |
| char normalization_steps; |
| char ndigits; |
| mp_limb_t base PACK; |
| #if UDIV_TIME > 2 * UMUL_TIME |
| mp_limb_t base_ninv PACK; |
| #endif |
| } big; |
| #endif |
| }; |
| |
| /* To reduce the memory needed we include some fields of the tables |
| only conditionally. */ |
| #if UDIV_TIME > 2 * UMUL_TIME |
| # define SEL1(X) X, |
| # define SEL2(X) ,X |
| #else |
| # define SEL1(X) |
| # define SEL2(X) |
| #endif |
| |
| /* Factor table for the different bases. */ |
| extern const struct base_table_t _itoa_base_table[] attribute_hidden; |
| |
| /* Lower-case digits. */ |
| extern const wchar_t _itowa_lower_digits[] attribute_hidden; |
| /* Upper-case digits. */ |
| extern const wchar_t _itowa_upper_digits[] attribute_hidden; |
| |
| |
| #if _ITOA_NEEDED |
| wchar_t * |
| _itowa (unsigned long long int value, wchar_t *buflim, unsigned int base, |
| int upper_case) |
| { |
| const wchar_t *digits = (upper_case |
| ? _itowa_upper_digits : _itowa_lower_digits); |
| wchar_t *bp = buflim; |
| const struct base_table_t *brec = &_itoa_base_table[base - 2]; |
| |
| switch (base) |
| { |
| # define RUN_2N(BITS) \ |
| do \ |
| { \ |
| /* `unsigned long long int' always has 64 bits. */ \ |
| mp_limb_t work_hi = value >> (64 - BITS_PER_MP_LIMB); \ |
| \ |
| if (BITS_PER_MP_LIMB == 32) \ |
| { \ |
| if (work_hi != 0) \ |
| { \ |
| mp_limb_t work_lo; \ |
| int cnt; \ |
| \ |
| work_lo = value & 0xfffffffful; \ |
| for (cnt = BITS_PER_MP_LIMB / BITS; cnt > 0; --cnt) \ |
| { \ |
| *--bp = digits[work_lo & ((1ul << BITS) - 1)]; \ |
| work_lo >>= BITS; \ |
| } \ |
| if (BITS_PER_MP_LIMB % BITS != 0) \ |
| { \ |
| work_lo \ |
| |= ((work_hi \ |
| & ((1 << (BITS - BITS_PER_MP_LIMB%BITS)) \ |
| - 1)) \ |
| << BITS_PER_MP_LIMB % BITS); \ |
| work_hi >>= BITS - BITS_PER_MP_LIMB % BITS; \ |
| if (work_hi == 0) \ |
| work_hi = work_lo; \ |
| else \ |
| *--bp = digits[work_lo]; \ |
| } \ |
| } \ |
| else \ |
| work_hi = value & 0xfffffffful; \ |
| } \ |
| do \ |
| { \ |
| *--bp = digits[work_hi & ((1 << BITS) - 1)]; \ |
| work_hi >>= BITS; \ |
| } \ |
| while (work_hi != 0); \ |
| } \ |
| while (0) |
| case 8: |
| RUN_2N (3); |
| break; |
| |
| case 16: |
| RUN_2N (4); |
| break; |
| |
| default: |
| { |
| # if BITS_PER_MP_LIMB == 64 |
| mp_limb_t base_multiplier = brec->base_multiplier; |
| if (brec->flag) |
| while (value != 0) |
| { |
| mp_limb_t quo, rem, x; |
| mp_limb_t dummy __attribute__ ((unused)); |
| |
| umul_ppmm (x, dummy, value, base_multiplier); |
| quo = (x + ((value - x) >> 1)) >> (brec->post_shift - 1); |
| rem = value - quo * base; |
| *--bp = digits[rem]; |
| value = quo; |
| } |
| else |
| while (value != 0) |
| { |
| mp_limb_t quo, rem, x; |
| mp_limb_t dummy __attribute__ ((unused)); |
| |
| umul_ppmm (x, dummy, value, base_multiplier); |
| quo = x >> brec->post_shift; |
| rem = value - quo * base; |
| *--bp = digits[rem]; |
| value = quo; |
| } |
| # endif |
| # if BITS_PER_MP_LIMB == 32 |
| mp_limb_t t[3]; |
| int n; |
| |
| /* First convert x0 to 1-3 words in base s->big.base. |
| Optimize for frequent cases of 32 bit numbers. */ |
| if ((mp_limb_t) (value >> 32) >= 1) |
| { |
| # if UDIV_TIME > 2 * UMUL_TIME || UDIV_NEEDS_NORMALIZATION |
| int big_normalization_steps = brec->big.normalization_steps; |
| mp_limb_t big_base_norm |
| = brec->big.base << big_normalization_steps; |
| # endif |
| if ((mp_limb_t) (value >> 32) >= brec->big.base) |
| { |
| mp_limb_t x1hi, x1lo, r; |
| /* If you want to optimize this, take advantage of |
| that the quotient in the first udiv_qrnnd will |
| always be very small. It might be faster just to |
| subtract in a tight loop. */ |
| |
| # if UDIV_TIME > 2 * UMUL_TIME |
| mp_limb_t x, xh, xl; |
| |
| if (big_normalization_steps == 0) |
| xh = 0; |
| else |
| xh = (mp_limb_t) (value >> (64 - big_normalization_steps)); |
| xl = (mp_limb_t) (value >> (32 - big_normalization_steps)); |
| udiv_qrnnd_preinv (x1hi, r, xh, xl, big_base_norm, |
| brec->big.base_ninv); |
| |
| xl = ((mp_limb_t) value) << big_normalization_steps; |
| udiv_qrnnd_preinv (x1lo, x, r, xl, big_base_norm, |
| brec->big.base_ninv); |
| t[2] = x >> big_normalization_steps; |
| |
| if (big_normalization_steps == 0) |
| xh = x1hi; |
| else |
| xh = ((x1hi << big_normalization_steps) |
| | (x1lo >> (32 - big_normalization_steps))); |
| xl = x1lo << big_normalization_steps; |
| udiv_qrnnd_preinv (t[0], x, xh, xl, big_base_norm, |
| brec->big.base_ninv); |
| t[1] = x >> big_normalization_steps; |
| # elif UDIV_NEEDS_NORMALIZATION |
| mp_limb_t x, xh, xl; |
| |
| if (big_normalization_steps == 0) |
| xh = 0; |
| else |
| xh = (mp_limb_t) (value >> 64 - big_normalization_steps); |
| xl = (mp_limb_t) (value >> 32 - big_normalization_steps); |
| udiv_qrnnd (x1hi, r, xh, xl, big_base_norm); |
| |
| xl = ((mp_limb_t) value) << big_normalization_steps; |
| udiv_qrnnd (x1lo, x, r, xl, big_base_norm); |
| t[2] = x >> big_normalization_steps; |
| |
| if (big_normalization_steps == 0) |
| xh = x1hi; |
| else |
| xh = ((x1hi << big_normalization_steps) |
| | (x1lo >> 32 - big_normalization_steps)); |
| xl = x1lo << big_normalization_steps; |
| udiv_qrnnd (t[0], x, xh, xl, big_base_norm); |
| t[1] = x >> big_normalization_steps; |
| # else |
| udiv_qrnnd (x1hi, r, 0, (mp_limb_t) (value >> 32), |
| brec->big.base); |
| udiv_qrnnd (x1lo, t[2], r, (mp_limb_t) value, brec->big.base); |
| udiv_qrnnd (t[0], t[1], x1hi, x1lo, brec->big.base); |
| # endif |
| n = 3; |
| } |
| else |
| { |
| # if UDIV_TIME > 2 * UMUL_TIME |
| mp_limb_t x; |
| |
| value <<= brec->big.normalization_steps; |
| udiv_qrnnd_preinv (t[0], x, (mp_limb_t) (value >> 32), |
| (mp_limb_t) value, big_base_norm, |
| brec->big.base_ninv); |
| t[1] = x >> brec->big.normalization_steps; |
| # elif UDIV_NEEDS_NORMALIZATION |
| mp_limb_t x; |
| |
| value <<= big_normalization_steps; |
| udiv_qrnnd (t[0], x, (mp_limb_t) (value >> 32), |
| (mp_limb_t) value, big_base_norm); |
| t[1] = x >> big_normalization_steps; |
| # else |
| udiv_qrnnd (t[0], t[1], (mp_limb_t) (value >> 32), |
| (mp_limb_t) value, brec->big.base); |
| # endif |
| n = 2; |
| } |
| } |
| else |
| { |
| t[0] = value; |
| n = 1; |
| } |
| |
| /* Convert the 1-3 words in t[], word by word, to ASCII. */ |
| do |
| { |
| mp_limb_t ti = t[--n]; |
| int ndig_for_this_limb = 0; |
| |
| # if UDIV_TIME > 2 * UMUL_TIME |
| mp_limb_t base_multiplier = brec->base_multiplier; |
| if (brec->flag) |
| while (ti != 0) |
| { |
| mp_limb_t quo, rem, x; |
| mp_limb_t dummy __attribute__ ((unused)); |
| |
| umul_ppmm (x, dummy, ti, base_multiplier); |
| quo = (x + ((ti - x) >> 1)) >> (brec->post_shift - 1); |
| rem = ti - quo * base; |
| *--bp = digits[rem]; |
| ti = quo; |
| ++ndig_for_this_limb; |
| } |
| else |
| while (ti != 0) |
| { |
| mp_limb_t quo, rem, x; |
| mp_limb_t dummy __attribute__ ((unused)); |
| |
| umul_ppmm (x, dummy, ti, base_multiplier); |
| quo = x >> brec->post_shift; |
| rem = ti - quo * base; |
| *--bp = digits[rem]; |
| ti = quo; |
| ++ndig_for_this_limb; |
| } |
| # else |
| while (ti != 0) |
| { |
| mp_limb_t quo, rem; |
| |
| quo = ti / base; |
| rem = ti % base; |
| *--bp = digits[rem]; |
| ti = quo; |
| ++ndig_for_this_limb; |
| } |
| # endif |
| /* If this wasn't the most significant word, pad with zeros. */ |
| if (n != 0) |
| while (ndig_for_this_limb < brec->big.ndigits) |
| { |
| *--bp = '0'; |
| ++ndig_for_this_limb; |
| } |
| } |
| while (n != 0); |
| # endif |
| } |
| break; |
| } |
| |
| return bp; |
| } |
| #endif |