diff options
Diffstat (limited to 'REORG.TODO/stdio-common/_itoa.c')
| -rw-r--r-- | REORG.TODO/stdio-common/_itoa.c | 479 |
1 files changed, 479 insertions, 0 deletions
diff --git a/REORG.TODO/stdio-common/_itoa.c b/REORG.TODO/stdio-common/_itoa.c new file mode 100644 index 0000000000..7b369ab49b --- /dev/null +++ b/REORG.TODO/stdio-common/_itoa.c @@ -0,0 +1,479 @@ +/* Internal function for converting integers to ASCII. + Copyright (C) 1994-2017 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 <_itoa.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 + + +/* We do not compile _itoa if we always can use _itoa_word. */ +#if _ITOA_NEEDED +/* Local variables. */ +const struct base_table_t _itoa_base_table[] attribute_hidden = +{ +# if BITS_PER_MP_LIMB == 64 + /* 2 */ {SEL1(0ull) 1, 1}, + /* 3 */ {SEL1(0xaaaaaaaaaaaaaaabull) 0, 1}, + /* 4 */ {SEL1(0ull) 1, 2}, + /* 5 */ {SEL1(0xcccccccccccccccdull) 0, 2}, + /* 6 */ {SEL1(0xaaaaaaaaaaaaaaabull) 0, 2}, + /* 7 */ {SEL1(0x2492492492492493ull) 1, 3}, + /* 8 */ {SEL1(0ull) 1, 3}, + /* 9 */ {SEL1(0xe38e38e38e38e38full) 0, 3}, + /* 10 */ {SEL1(0xcccccccccccccccdull) 0, 3}, + /* 11 */ {SEL1(0x2e8ba2e8ba2e8ba3ull) 0, 1}, + /* 12 */ {SEL1(0xaaaaaaaaaaaaaaabull) 0, 3}, + /* 13 */ {SEL1(0x4ec4ec4ec4ec4ec5ull) 0, 2}, + /* 14 */ {SEL1(0x2492492492492493ull) 1, 4}, + /* 15 */ {SEL1(0x8888888888888889ull) 0, 3}, + /* 16 */ {SEL1(0ull) 1, 4}, + /* 17 */ {SEL1(0xf0f0f0f0f0f0f0f1ull) 0, 4}, + /* 18 */ {SEL1(0xe38e38e38e38e38full) 0, 4}, + /* 19 */ {SEL1(0xd79435e50d79435full) 0, 4}, + /* 20 */ {SEL1(0xcccccccccccccccdull) 0, 4}, + /* 21 */ {SEL1(0x8618618618618619ull) 1, 5}, + /* 22 */ {SEL1(0x2e8ba2e8ba2e8ba3ull) 0, 2}, + /* 23 */ {SEL1(0x642c8590b21642c9ull) 1, 5}, + /* 24 */ {SEL1(0xaaaaaaaaaaaaaaabull) 0, 4}, + /* 25 */ {SEL1(0x47ae147ae147ae15ull) 1, 5}, + /* 26 */ {SEL1(0x4ec4ec4ec4ec4ec5ull) 0, 3}, + /* 27 */ {SEL1(0x97b425ed097b425full) 0, 4}, + /* 28 */ {SEL1(0x2492492492492493ull) 1, 5}, + /* 29 */ {SEL1(0x1a7b9611a7b9611bull) 1, 5}, + /* 30 */ {SEL1(0x8888888888888889ull) 0, 4}, + /* 31 */ {SEL1(0x0842108421084211ull) 1, 5}, + /* 32 */ {SEL1(0ull) 1, 5}, + /* 33 */ {SEL1(0x0f83e0f83e0f83e1ull) 0, 1}, + /* 34 */ {SEL1(0xf0f0f0f0f0f0f0f1ull) 0, 5}, + /* 35 */ {SEL1(0xea0ea0ea0ea0ea0full) 0, 5}, + /* 36 */ {SEL1(0xe38e38e38e38e38full) 0, 5} +# endif +# if BITS_PER_MP_LIMB == 32 + /* 2 */ {SEL1(0ul) 1, 1, {0, 31, 0x80000000ul SEL2(0xfffffffful)}}, + /* 3 */ {SEL1(0xaaaaaaabul) 0, 1, {0, 20, 0xcfd41b91ul SEL2(0x3b563c24ul)}}, + /* 4 */ {SEL1(0ul) 1, 2, {1, 15, 0x40000000ul SEL2(0xfffffffful)}}, + /* 5 */ {SEL1(0xcccccccdul) 0, 2, {1, 13, 0x48c27395ul SEL2(0xc25c2684ul)}}, + /* 6 */ {SEL1(0xaaaaaaabul) 0, 2, {0, 12, 0x81bf1000ul SEL2(0xf91bd1b6ul)}}, + /* 7 */ {SEL1(0x24924925ul) 1, 3, {1, 11, 0x75db9c97ul SEL2(0x1607a2cbul)}}, + /* 8 */ {SEL1(0ul) 1, 3, {1, 10, 0x40000000ul SEL2(0xfffffffful)}}, + /* 9 */ {SEL1(0x38e38e39ul) 0, 1, {0, 10, 0xcfd41b91ul SEL2(0x3b563c24ul)}}, + /* 10 */ {SEL1(0xcccccccdul) 0, 3, {2, 9, 0x3b9aca00ul SEL2(0x12e0be82ul)}}, + /* 11 */ {SEL1(0xba2e8ba3ul) 0, 3, {0, 9, 0x8c8b6d2bul SEL2(0xd24cde04ul)}}, + /* 12 */ {SEL1(0xaaaaaaabul) 0, 3, {3, 8, 0x19a10000ul SEL2(0x3fa39ab5ul)}}, + /* 13 */ {SEL1(0x4ec4ec4ful) 0, 2, {2, 8, 0x309f1021ul SEL2(0x50f8ac5ful)}}, + /* 14 */ {SEL1(0x24924925ul) 1, 4, {1, 8, 0x57f6c100ul SEL2(0x74843b1eul)}}, + /* 15 */ {SEL1(0x88888889ul) 0, 3, {0, 8, 0x98c29b81ul SEL2(0xad0326c2ul)}}, + /* 16 */ {SEL1(0ul) 1, 4, {3, 7, 0x10000000ul SEL2(0xfffffffful)}}, + /* 17 */ {SEL1(0xf0f0f0f1ul) 0, 4, {3, 7, 0x18754571ul SEL2(0x4ef0b6bdul)}}, + /* 18 */ {SEL1(0x38e38e39ul) 0, 2, {2, 7, 0x247dbc80ul SEL2(0xc0fc48a1ul)}}, + /* 19 */ {SEL1(0xaf286bcbul) 1, 5, {2, 7, 0x3547667bul SEL2(0x33838942ul)}}, + /* 20 */ {SEL1(0xcccccccdul) 0, 4, {1, 7, 0x4c4b4000ul SEL2(0xad7f29abul)}}, + /* 21 */ {SEL1(0x86186187ul) 1, 5, {1, 7, 0x6b5a6e1dul SEL2(0x313c3d15ul)}}, + /* 22 */ {SEL1(0xba2e8ba3ul) 0, 4, {0, 7, 0x94ace180ul SEL2(0xb8cca9e0ul)}}, + /* 23 */ {SEL1(0xb21642c9ul) 0, 4, {0, 7, 0xcaf18367ul SEL2(0x42ed6de9ul)}}, + /* 24 */ {SEL1(0xaaaaaaabul) 0, 4, {4, 6, 0x0b640000ul SEL2(0x67980e0bul)}}, + /* 25 */ {SEL1(0x51eb851ful) 0, 3, {4, 6, 0x0e8d4a51ul SEL2(0x19799812ul)}}, + /* 26 */ {SEL1(0x4ec4ec4ful) 0, 3, {3, 6, 0x1269ae40ul SEL2(0xbce85396ul)}}, + /* 27 */ {SEL1(0x2f684bdbul) 1, 5, {3, 6, 0x17179149ul SEL2(0x62c103a9ul)}}, + /* 28 */ {SEL1(0x24924925ul) 1, 5, {3, 6, 0x1cb91000ul SEL2(0x1d353d43ul)}}, + /* 29 */ {SEL1(0x8d3dcb09ul) 0, 4, {2, 6, 0x23744899ul SEL2(0xce1deceaul)}}, + /* 30 */ {SEL1(0x88888889ul) 0, 4, {2, 6, 0x2b73a840ul SEL2(0x790fc511ul)}}, + /* 31 */ {SEL1(0x08421085ul) 1, 5, {2, 6, 0x34e63b41ul SEL2(0x35b865a0ul)}}, + /* 32 */ {SEL1(0ul) 1, 5, {1, 6, 0x40000000ul SEL2(0xfffffffful)}}, + /* 33 */ {SEL1(0x3e0f83e1ul) 0, 3, {1, 6, 0x4cfa3cc1ul SEL2(0xa9aed1b3ul)}}, + /* 34 */ {SEL1(0xf0f0f0f1ul) 0, 5, {1, 6, 0x5c13d840ul SEL2(0x63dfc229ul)}}, + /* 35 */ {SEL1(0xd41d41d5ul) 1, 6, {1, 6, 0x6d91b519ul SEL2(0x2b0fee30ul)}}, + /* 36 */ {SEL1(0x38e38e39ul) 0, 3, {0, 6, 0x81bf1000ul SEL2(0xf91bd1b6ul)}} +# endif +}; +#endif + +char * +_itoa_word (_ITOA_WORD_TYPE value, char *buflim, + unsigned int base, int upper_case) +{ + const char *digits = (upper_case + ? _itoa_upper_digits + : _itoa_lower_digits); + + switch (base) + { +#define SPECIAL(Base) \ + case Base: \ + do \ + *--buflim = digits[value % Base]; \ + while ((value /= Base) != 0); \ + break + + SPECIAL (10); + SPECIAL (16); + SPECIAL (8); + default: + do + *--buflim = digits[value % base]; + while ((value /= base) != 0); + } + return buflim; +} +#undef SPECIAL + + +#if _ITOA_NEEDED +char * +_itoa (unsigned long long int value, char *buflim, unsigned int base, + int upper_case) +{ + const char *digits = (upper_case + ? _itoa_upper_digits + : _itoa_lower_digits); + 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) \ + { \ + *--buflim = 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 \ + *--buflim = digits[work_lo]; \ + } \ + } \ + else \ + work_hi = value & 0xfffffffful; \ + } \ + do \ + { \ + *--buflim = 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: + { + char *bufend = buflim; +# 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; + *--buflim = 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; + *--buflim = 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; + *--buflim = 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; + *--buflim = digits[rem]; + ti = quo; + ++ndig_for_this_limb; + } +# else + while (ti != 0) + { + mp_limb_t quo, rem; + + quo = ti / base; + rem = ti % base; + *--buflim = 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) + { + *--buflim = '0'; + ++ndig_for_this_limb; + } + } + while (n != 0); +# endif + if (buflim == bufend) + *--buflim = '0'; + } + break; + } + + return buflim; +} +#endif + +char * +_fitoa_word (_ITOA_WORD_TYPE value, char *buf, unsigned int base, + int upper_case) +{ + char tmpbuf[sizeof (value) * 4]; /* Worst case length: base 2. */ + char *cp = _itoa_word (value, tmpbuf + sizeof (value) * 4, base, upper_case); + while (cp < tmpbuf + sizeof (value) * 4) + *buf++ = *cp++; + return buf; +} + +#if _ITOA_NEEDED +char * +_fitoa (unsigned long long value, char *buf, unsigned int base, int upper_case) +{ + char tmpbuf[sizeof (value) * 4]; /* Worst case length: base 2. */ + char *cp = _itoa (value, tmpbuf + sizeof (value) * 4, base, upper_case); + while (cp < tmpbuf + sizeof (value) * 4) + *buf++ = *cp++; + return buf; +} +#endif |