| /* A correct <float.h>. |
| |
| Copyright (C) 2007-2016 Free Software Foundation, Inc. |
| |
| This program is free software: you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| |
| #ifndef _@GUARD_PREFIX@_FLOAT_H |
| |
| #if __GNUC__ >= 3 |
| @PRAGMA_SYSTEM_HEADER@ |
| #endif |
| @PRAGMA_COLUMNS@ |
| |
| /* The include_next requires a split double-inclusion guard. */ |
| #@INCLUDE_NEXT@ @NEXT_FLOAT_H@ |
| |
| #ifndef _@GUARD_PREFIX@_FLOAT_H |
| #define _@GUARD_PREFIX@_FLOAT_H |
| |
| /* 'long double' properties. */ |
| |
| #if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__) |
| /* Number of mantissa units, in base FLT_RADIX. */ |
| # undef LDBL_MANT_DIG |
| # define LDBL_MANT_DIG 64 |
| /* Number of decimal digits that is sufficient for representing a number. */ |
| # undef LDBL_DIG |
| # define LDBL_DIG 18 |
| /* x-1 where x is the smallest representable number > 1. */ |
| # undef LDBL_EPSILON |
| # define LDBL_EPSILON 1.0842021724855044340E-19L |
| /* Minimum e such that FLT_RADIX^(e-1) is a normalized number. */ |
| # undef LDBL_MIN_EXP |
| # define LDBL_MIN_EXP (-16381) |
| /* Maximum e such that FLT_RADIX^(e-1) is a representable finite number. */ |
| # undef LDBL_MAX_EXP |
| # define LDBL_MAX_EXP 16384 |
| /* Minimum positive normalized number. */ |
| # undef LDBL_MIN |
| # define LDBL_MIN 3.3621031431120935063E-4932L |
| /* Maximum representable finite number. */ |
| # undef LDBL_MAX |
| # define LDBL_MAX 1.1897314953572317650E+4932L |
| /* Minimum e such that 10^e is in the range of normalized numbers. */ |
| # undef LDBL_MIN_10_EXP |
| # define LDBL_MIN_10_EXP (-4931) |
| /* Maximum e such that 10^e is in the range of representable finite numbers. */ |
| # undef LDBL_MAX_10_EXP |
| # define LDBL_MAX_10_EXP 4932 |
| #endif |
| |
| /* On FreeBSD/x86 6.4, the 'long double' type really has only 53 bits of |
| precision in the compiler but 64 bits of precision at runtime. See |
| <http://lists.gnu.org/archive/html/bug-gnulib/2008-07/msg00063.html>. */ |
| #if defined __i386__ && defined __FreeBSD__ |
| /* Number of mantissa units, in base FLT_RADIX. */ |
| # undef LDBL_MANT_DIG |
| # define LDBL_MANT_DIG 64 |
| /* Number of decimal digits that is sufficient for representing a number. */ |
| # undef LDBL_DIG |
| # define LDBL_DIG 18 |
| /* x-1 where x is the smallest representable number > 1. */ |
| # undef LDBL_EPSILON |
| # define LDBL_EPSILON 1.084202172485504434007452800869941711426e-19L /* 2^-63 */ |
| /* Minimum e such that FLT_RADIX^(e-1) is a normalized number. */ |
| # undef LDBL_MIN_EXP |
| # define LDBL_MIN_EXP (-16381) |
| /* Maximum e such that FLT_RADIX^(e-1) is a representable finite number. */ |
| # undef LDBL_MAX_EXP |
| # define LDBL_MAX_EXP 16384 |
| /* Minimum positive normalized number. */ |
| # undef LDBL_MIN |
| # define LDBL_MIN 3.3621031431120935E-4932L /* = 0x1p-16382L */ |
| /* Maximum representable finite number. */ |
| # undef LDBL_MAX |
| /* LDBL_MAX is represented as { 0xFFFFFFFF, 0xFFFFFFFF, 32766 }. |
| But the largest literal that GCC allows us to write is |
| 0x0.fffffffffffff8p16384L = { 0xFFFFF800, 0xFFFFFFFF, 32766 }. |
| So, define it like this through a reference to an external variable |
| |
| const unsigned int LDBL_MAX[3] = { 0xFFFFFFFF, 0xFFFFFFFF, 32766 }; |
| extern const long double LDBL_MAX; |
| |
| Unfortunately, this is not a constant expression. */ |
| union gl_long_double_union |
| { |
| struct { unsigned int lo; unsigned int hi; unsigned int exponent; } xd; |
| long double ld; |
| }; |
| extern const union gl_long_double_union gl_LDBL_MAX; |
| # define LDBL_MAX (gl_LDBL_MAX.ld) |
| /* Minimum e such that 10^e is in the range of normalized numbers. */ |
| # undef LDBL_MIN_10_EXP |
| # define LDBL_MIN_10_EXP (-4931) |
| /* Maximum e such that 10^e is in the range of representable finite numbers. */ |
| # undef LDBL_MAX_10_EXP |
| # define LDBL_MAX_10_EXP 4932 |
| #endif |
| |
| /* On AIX 7.1 with gcc 4.2, the values of LDBL_MIN_EXP, LDBL_MIN, LDBL_MAX are |
| wrong. |
| On Linux/PowerPC with gcc 4.4, the value of LDBL_MAX is wrong. */ |
| #if (defined _ARCH_PPC || defined _POWER) && defined _AIX && (LDBL_MANT_DIG == 106) && defined __GNUC__ |
| # undef LDBL_MIN_EXP |
| # define LDBL_MIN_EXP DBL_MIN_EXP |
| # undef LDBL_MIN_10_EXP |
| # define LDBL_MIN_10_EXP DBL_MIN_10_EXP |
| # undef LDBL_MIN |
| # define LDBL_MIN 2.22507385850720138309023271733240406422e-308L /* DBL_MIN = 2^-1022 */ |
| #endif |
| #if (defined _ARCH_PPC || defined _POWER) && (defined _AIX || defined __linux__) && (LDBL_MANT_DIG == 106) && defined __GNUC__ |
| # undef LDBL_MAX |
| /* LDBL_MAX is represented as { 0x7FEFFFFF, 0xFFFFFFFF, 0x7C8FFFFF, 0xFFFFFFFF }. |
| It is not easy to define: |
| #define LDBL_MAX 1.79769313486231580793728971405302307166e308L |
| is too small, whereas |
| #define LDBL_MAX 1.79769313486231580793728971405302307167e308L |
| is too large. Apparently a bug in GCC decimal-to-binary conversion. |
| Also, I can't get values larger than |
| #define LDBL63 ((long double) (1ULL << 63)) |
| #define LDBL882 (LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63) |
| #define LDBL945 (LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63) |
| #define LDBL1008 (LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63 * LDBL63) |
| #define LDBL_MAX (LDBL1008 * 65535.0L + LDBL945 * (long double) 9223372036821221375ULL + LDBL882 * (long double) 4611686018427387904ULL) |
| which is represented as { 0x7FEFFFFF, 0xFFFFFFFF, 0x7C8FFFFF, 0xF8000000 }. |
| So, define it like this through a reference to an external variable |
| |
| const double LDBL_MAX[2] = { DBL_MAX, DBL_MAX / (double)134217728UL / (double)134217728UL }; |
| extern const long double LDBL_MAX; |
| |
| or through a pointer cast |
| |
| #define LDBL_MAX \ |
| (*(const long double *) (double[]) { DBL_MAX, DBL_MAX / (double)134217728UL / (double)134217728UL }) |
| |
| Unfortunately, this is not a constant expression, and the latter expression |
| does not work well when GCC is optimizing.. */ |
| union gl_long_double_union |
| { |
| struct { double hi; double lo; } dd; |
| long double ld; |
| }; |
| extern const union gl_long_double_union gl_LDBL_MAX; |
| # define LDBL_MAX (gl_LDBL_MAX.ld) |
| #endif |
| |
| /* On IRIX 6.5, with cc, the value of LDBL_MANT_DIG is wrong. |
| On IRIX 6.5, with gcc 4.2, the values of LDBL_MIN_EXP, LDBL_MIN, LDBL_EPSILON |
| are wrong. */ |
| #if defined __sgi && (LDBL_MANT_DIG >= 106) |
| # undef LDBL_MANT_DIG |
| # define LDBL_MANT_DIG 106 |
| # if defined __GNUC__ |
| # undef LDBL_MIN_EXP |
| # define LDBL_MIN_EXP DBL_MIN_EXP |
| # undef LDBL_MIN_10_EXP |
| # define LDBL_MIN_10_EXP DBL_MIN_10_EXP |
| # undef LDBL_MIN |
| # define LDBL_MIN 2.22507385850720138309023271733240406422e-308L /* DBL_MIN = 2^-1022 */ |
| # undef LDBL_EPSILON |
| # define LDBL_EPSILON 2.46519032881566189191165176650870696773e-32L /* 2^-105 */ |
| # endif |
| #endif |
| |
| #if @REPLACE_ITOLD@ |
| /* Pull in a function that fixes the 'int' to 'long double' conversion |
| of glibc 2.7. */ |
| extern |
| # ifdef __cplusplus |
| "C" |
| # endif |
| void _Qp_itoq (long double *, int); |
| static void (*_gl_float_fix_itold) (long double *, int) = _Qp_itoq; |
| #endif |
| |
| #endif /* _@GUARD_PREFIX@_FLOAT_H */ |
| #endif /* _@GUARD_PREFIX@_FLOAT_H */ |