diff options
Diffstat (limited to 'lib/float.in.h')
| -rw-r--r-- | lib/float.in.h | 138 |
1 files changed, 6 insertions, 132 deletions
diff --git a/lib/float.in.h b/lib/float.in.h index dab2a2b..ad99af3 100644 --- a/lib/float.in.h +++ b/lib/float.in.h @@ -1,6 +1,6 @@ /* A correct <float.h>. - Copyright (C) 2007-2015 Free Software Foundation, Inc. + Copyright (C) 2007-2010 Free Software Foundation, Inc. This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by @@ -15,21 +15,19 @@ You should have received a copy of the GNU Lesser General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ -#ifndef _@GUARD_PREFIX@_FLOAT_H +#ifndef _GL_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 +#ifndef _GL_FLOAT_H +#define _GL_FLOAT_H /* 'long double' properties. */ - #if defined __i386__ && (defined __BEOS__ || defined __OpenBSD__) /* Number of mantissa units, in base FLT_RADIX. */ # undef LDBL_MANT_DIG @@ -60,129 +58,5 @@ # 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 */ +#endif /* _GL_FLOAT_H */ +#endif /* _GL_FLOAT_H */ |