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-rw-r--r--stdio-common/_itowa.c346
1 files changed, 346 insertions, 0 deletions
diff --git a/stdio-common/_itowa.c b/stdio-common/_itowa.c
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+++ b/stdio-common/_itowa.c
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+/* Internal function for converting integers to ASCII.
+ Copyright (C) 1994, 1995, 1996, 1999 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <gmp-mparam.h>
+#include <stdlib/gmp.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[];
+
+/* Lower-case digits. */
+extern const wchar_t _itowa_lower_digits[];
+/* Upper-case digits. */
+extern const wchar_t _itowa_upper_digits[];
+
+
+wchar_t *
+_itowa (value, buflim, base, upper_case)
+ 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, dummy;
+
+ 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, dummy;
+
+ 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, dummy;
+
+ 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, dummy;
+
+ 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;
+}
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