summaryrefslogtreecommitdiff
path: root/Build/source/libs/mpfr/mpfr-src/src/get_d128.c
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/mpfr/mpfr-src/src/get_d128.c')
-rw-r--r--Build/source/libs/mpfr/mpfr-src/src/get_d128.c441
1 files changed, 0 insertions, 441 deletions
diff --git a/Build/source/libs/mpfr/mpfr-src/src/get_d128.c b/Build/source/libs/mpfr/mpfr-src/src/get_d128.c
deleted file mode 100644
index 69b1d206458..00000000000
--- a/Build/source/libs/mpfr/mpfr-src/src/get_d128.c
+++ /dev/null
@@ -1,441 +0,0 @@
-/* mpfr_get_decimal128 -- convert a multiple precision floating-point number
- to an IEEE 754-2008 decimal128 float
-
-See https://gcc.gnu.org/legacy-ml/gcc/2006-06/msg00691.html,
-https://gcc.gnu.org/onlinedocs/gcc/Decimal-Float.html,
-and TR 24732 <http://www.open-std.org/jtc1/sc22/wg14/www/projects#24732>.
-
-Copyright 2006-2020 Free Software Foundation, Inc.
-Contributed by the AriC and Caramba projects, INRIA.
-
-This file is part of the GNU MPFR Library.
-
-The GNU MPFR 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 3 of the License, or (at your
-option) any later version.
-
-The GNU MPFR 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 MPFR Library; see the file COPYING.LESSER. If not, see
-https://www.gnu.org/licenses/ or write to the Free Software Foundation, Inc.,
-51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. */
-
-#include "mpfr-impl.h"
-#include "ieee_floats.h"
-
-#define ISDIGIT(c) ('0' <= c && c <= '9')
-
-#ifdef MPFR_WANT_DECIMAL_FLOATS
-
-#ifndef DEC128_MAX
-# define DEC128_MAX 9.999999999999999999999999999999999E6144dl
-#endif
-
-/* construct a decimal128 NaN */
-static _Decimal128
-get_decimal128_nan (void)
-{
- return (_Decimal128) MPFR_DBL_NAN;
-}
-
-/* construct the decimal128 Inf with given sign */
-static _Decimal128
-get_decimal128_inf (int negative)
-{
- return (_Decimal128) (negative ? MPFR_DBL_INFM : MPFR_DBL_INFP);
-}
-
-/* construct the decimal128 zero with given sign */
-static _Decimal128
-get_decimal128_zero (int negative)
-{
- _Decimal128 zero = 0;
- return (_Decimal128) (negative ? -zero : zero);
-}
-
-/* construct the decimal128 smallest non-zero with given sign:
- it is 10^emin * 10^(1-p). Since emax = 6144, emin = 1-emax = -6143,
- and p = 34, we get 10^(-6176) */
-static _Decimal128
-get_decimal128_min (int negative)
-{
- return negative ? - 1E-6176dl : 1E-6176dl;
-}
-
-/* construct the decimal128 largest finite number with given sign */
-static _Decimal128
-get_decimal128_max (int negative)
-{
- return negative ? - DEC128_MAX : DEC128_MAX;
-}
-
-/* one-to-one conversion:
- s is a decimal string representing a number x = m * 10^e which must be
- exactly representable in the decimal128 format, i.e.
- (a) the mantissa m has at most 34 decimal digits
- (b1) -6143 <= e <= 6144 with m integer multiple of 10^(-33), |m| < 10
- (b2) or -6176 <= e <= 6111 with m integer, |m| < 10^34.
- Assumes s is neither NaN nor +Inf nor -Inf.
- s = [-][0-9]+E[-][0-9]+
-
- The decimal128 format (cf table 3.6 of IEEE 754-2008) has the following
- parameters:
- * k = 128 (number of bits of storage)
- * p = 34 (precision in digits)
- * emax = 6144
- * bias = E-q = 6176
- * sign bit has 1 bit
- * w+5 = 17 bits (combination field width)
- * t = 110 bits (trailing significand width)
- We have k = 1 + 5 + w + t = 128.
-*/
-static _Decimal128
-string_to_Decimal128 (char *s) /* portable version */
-{
- long int exp = 0;
- char m[35];
- long n = 0; /* mantissa length */
- char *endptr[1];
- _Decimal128 x = 0;
- int sign = 0;
-
- /* read sign */
- if (*s == '-')
- {
- sign = 1;
- s ++;
- }
- /* read mantissa */
- while (ISDIGIT (*s))
- m[n++] = *s++;
-
- /* as constructed in mpfr_get_decimal128, s cannot have any '.' separator */
-
- /* we will consider an integer mantissa m*10^exp */
- MPFR_ASSERTN(n <= 34);
- /* s always has an exponent separator 'E' */
- MPFR_ASSERTN(*s == 'E');
- exp = strtol (s + 1, endptr, 10);
- MPFR_ASSERTN(**endptr == '\0');
- MPFR_ASSERTN(-6176 <= exp && exp <= (long) (6145 - n));
- while (n < 34)
- {
- m[n++] = '0';
- exp --;
- }
- /* now n=34 and -6176 <= exp <= 6111, cf (b2) */
- m[n] = '\0';
-
- /* the number to convert is m[] * 10^exp where the mantissa is a 34-digit
- integer */
-
- /* compute biased exponent */
- exp += 6176;
-
- MPFR_ASSERTN(exp >= -33);
- if (exp < 0)
- {
- int i;
- n = -exp;
- /* check the last n digits of the mantissa are zero */
- for (i = 1; i <= n; i++)
- MPFR_ASSERTN(m[34 - n] == '0');
- /* shift the first (34-n) digits to the right */
- for (i = 34 - n - 1; i >= 0; i--)
- m[i + n] = m[i];
- /* zero the first n digits */
- for (i = 0; i < n; i ++)
- m[i] = '0';
- exp = 0;
- }
-
- /* the number to convert is m[] * 10^(exp-6176) */
- exp -= 6176;
-
- for (n = 0; n < 34; n++)
- x = (_Decimal128) 10 * x + (_Decimal128) (m[n] - '0');
-
- /* multiply by 10^exp */
- if (exp > 0)
- {
- _Decimal128 ten = 10;
- _Decimal128 ten2 = ten * ten;
- _Decimal128 ten4 = ten2 * ten2;
- _Decimal128 ten8 = ten4 * ten4;
- _Decimal128 ten16 = ten8 * ten8;
- _Decimal128 ten32 = ten16 * ten16;
- _Decimal128 ten64 = ten32 * ten32;
- _Decimal128 ten128 = ten64 * ten64;
- _Decimal128 ten256 = ten128 * ten128;
- _Decimal128 ten512 = ten256 * ten256;
- _Decimal128 ten1024 = ten512 * ten512;
- _Decimal128 ten2048 = ten1024 * ten1024;
- _Decimal128 ten4096 = ten2048 * ten2048;
-
- if (exp >= 4096)
- {
- x *= ten4096;
- exp -= 4096;
- }
- if (exp >= 2048)
- {
- x *= ten2048;
- exp -= 2048;
- }
- if (exp >= 1024)
- {
- x *= ten1024;
- exp -= 1024;
- }
- if (exp >= 512)
- {
- x *= ten512;
- exp -= 512;
- }
- if (exp >= 256)
- {
- x *= ten256;
- exp -= 256;
- }
- if (exp >= 128)
- {
- x *= ten128;
- exp -= 128;
- }
- if (exp >= 64)
- {
- x *= ten64;
- exp -= 64;
- }
- if (exp >= 32)
- {
- x *= ten32;
- exp -= 32;
- }
- if (exp >= 16)
- {
- x *= ten16;
- exp -= 16;
- }
- if (exp >= 8)
- {
- x *= ten8;
- exp -= 8;
- }
- if (exp >= 4)
- {
- x *= ten4;
- exp -= 4;
- }
- if (exp >= 2)
- {
- x *= ten2;
- exp -= 2;
- }
- if (exp >= 1)
- {
- x *= ten;
- exp -= 1;
- }
- }
- else if (exp < 0)
- {
- _Decimal128 ten = 10;
- _Decimal128 ten2 = ten * ten;
- _Decimal128 ten4 = ten2 * ten2;
- _Decimal128 ten8 = ten4 * ten4;
- _Decimal128 ten16 = ten8 * ten8;
- _Decimal128 ten32 = ten16 * ten16;
- _Decimal128 ten64 = ten32 * ten32;
- _Decimal128 ten128 = ten64 * ten64;
- _Decimal128 ten256 = ten128 * ten128;
- _Decimal128 ten512 = ten256 * ten256;
- _Decimal128 ten1024 = ten512 * ten512;
- _Decimal128 ten2048 = ten1024 * ten1024;
- _Decimal128 ten4096 = ten2048 * ten2048;
-
- if (exp <= -4096)
- {
- x /= ten4096;
- exp += 4096;
- }
- if (exp <= -2048)
- {
- x /= ten2048;
- exp += 2048;
- }
- if (exp <= -1024)
- {
- x /= ten1024;
- exp += 1024;
- }
- if (exp <= -512)
- {
- x /= ten512;
- exp += 512;
- }
- if (exp <= -256)
- {
- x /= ten256;
- exp += 256;
- }
- if (exp <= -128)
- {
- x /= ten128;
- exp += 128;
- }
- if (exp <= -64)
- {
- x /= ten64;
- exp += 64;
- }
- if (exp <= -32)
- {
- x /= ten32;
- exp += 32;
- }
- if (exp <= -16)
- {
- x /= ten16;
- exp += 16;
- }
- if (exp <= -8)
- {
- x /= ten8;
- exp += 8;
- }
- if (exp <= -4)
- {
- x /= ten4;
- exp += 4;
- }
- if (exp <= -2)
- {
- x /= ten2;
- exp += 2;
- }
- if (exp <= -1)
- {
- x /= ten;
- exp += 1;
- }
- }
-
- if (sign)
- x = -x;
-
- return x;
-}
-
-_Decimal128
-mpfr_get_decimal128 (mpfr_srcptr src, mpfr_rnd_t rnd_mode)
-{
- int negative;
- mpfr_exp_t e;
-
- if (MPFR_UNLIKELY (MPFR_IS_SINGULAR (src)))
- {
- if (MPFR_IS_NAN (src))
- return get_decimal128_nan ();
-
- negative = MPFR_IS_NEG (src);
-
- if (MPFR_IS_INF (src))
- return get_decimal128_inf (negative);
-
- MPFR_ASSERTD (MPFR_IS_ZERO(src));
- return get_decimal128_zero (negative);
- }
-
- e = MPFR_GET_EXP (src);
- negative = MPFR_IS_NEG (src);
-
- MPFR_UPDATE2_RND_MODE (rnd_mode, MPFR_SIGN (src));
-
- /* now rnd_mode is RNDN, RNDF, RNDA or RNDZ */
-
- /* the smallest decimal128 number is 10^(-6176),
- with 2^(-20517) < 10^(-6176) < 2^(-20516) */
- if (MPFR_UNLIKELY (e < -20517)) /* src <= 2^(-20518) < 1/2*10^(-6176) */
- {
- if (rnd_mode != MPFR_RNDA)
- return get_decimal128_zero (negative);
- else /* RNDA: return the smallest non-zero number */
- return get_decimal128_min (negative);
- }
- /* the largest decimal128 number is just below 10^6145 < 2^20414 */
- else if (MPFR_UNLIKELY (e > 20414)) /* then src >= 2^20414 */
- {
- if (rnd_mode == MPFR_RNDZ)
- return get_decimal128_max (negative);
- else /* RNDN, RNDA, RNDF: round away */
- return get_decimal128_inf (negative);
- }
- else
- {
- /* we need to store the sign (1 character), the significand (at most 34
- characters), the exponent part (at most 6 characters for "E-6176"),
- and the terminating null character, thus we need at least 42
- characters in s. */
- char s[42];
- mpfr_get_str (s, &e, 10, 34, src, rnd_mode);
- /* the smallest normal number is 1.000...000E-6143,
- which corresponds to s=[0.]1000...000 and e=-6142 */
- if (e < -6142)
- {
- /* the smallest subnormal number is 0.000...001E-6143 = 1E-6176,
- which corresponds to s=[0.]1000...000 and e=-6175 */
- if (e < -6175)
- {
- if (rnd_mode == MPFR_RNDN && e == -6176)
- {
- /* If 0.5E-6176 < |src| < 1E-6176 (smallest subnormal),
- src should round to +/- 1E-6176 in MPFR_RNDN. */
- mpfr_get_str (s, &e, 10, 1, src, MPFR_RNDA);
- return e == -6176 && s[negative] <= '5' ?
- get_decimal128_zero (negative) :
- get_decimal128_min (negative);
- }
- if (rnd_mode == MPFR_RNDZ || rnd_mode == MPFR_RNDN)
- return get_decimal128_zero (negative);
- else /* RNDA or RNDF: return the smallest non-zero number */
- return get_decimal128_min (negative);
- }
- else
- {
- mpfr_exp_t e2;
- long digits = 34 - (-6142 - e);
- /* if e = -6175 then 34 - (-6142 - e) = 1 */
- mpfr_get_str (s, &e2, 10, digits, src, rnd_mode);
- /* Warning: we can have e2 = e + 1 here, when rounding to
- nearest or away from zero. */
- s[negative + digits] = 'E';
- sprintf (s + negative + digits + 1, "%ld",
- (long int)e2 - digits);
- return string_to_Decimal128 (s);
- }
- }
- /* the largest number is 9.999...999E+6144,
- which corresponds to s=[0.]9999...999 and e=6145 */
- else if (e > 6145)
- {
- if (rnd_mode == MPFR_RNDZ)
- return get_decimal128_max (negative);
- else /* RNDN, RNDA, RNDF: round away */
- return get_decimal128_inf (negative);
- }
- else /* -6142 <= e <= 6145 */
- {
- s[34 + negative] = 'E';
- sprintf (s + 35 + negative, "%ld", (long int) e - 34);
- return string_to_Decimal128 (s);
- }
- }
-}
-
-#endif /* MPFR_WANT_DECIMAL_FLOATS */