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Diffstat (limited to 'gl/isnan.c')
| -rw-r--r-- | gl/isnan.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/gl/isnan.c b/gl/isnan.c deleted file mode 100644 index d95e4bac77..0000000000 --- a/gl/isnan.c +++ /dev/null @@ -1,177 +0,0 @@ -/* Test for NaN that does not need libm. - Copyright (C) 2007-2013 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/>. */ - -/* Written by Bruno Haible <bruno@clisp.org>, 2007. */ - -#include <config.h> - -/* Specification. */ -#ifdef USE_LONG_DOUBLE -/* Specification found in math.h or isnanl-nolibm.h. */ -extern int rpl_isnanl (long double x) _GL_ATTRIBUTE_CONST; -#elif ! defined USE_FLOAT -/* Specification found in math.h or isnand-nolibm.h. */ -extern int rpl_isnand (double x); -#else /* defined USE_FLOAT */ -/* Specification found in math.h or isnanf-nolibm.h. */ -extern int rpl_isnanf (float x); -#endif - -#include <float.h> -#include <string.h> - -#include "float+.h" - -#ifdef USE_LONG_DOUBLE -# define FUNC rpl_isnanl -# define DOUBLE long double -# define MAX_EXP LDBL_MAX_EXP -# define MIN_EXP LDBL_MIN_EXP -# if defined LDBL_EXPBIT0_WORD && defined LDBL_EXPBIT0_BIT -# define KNOWN_EXPBIT0_LOCATION -# define EXPBIT0_WORD LDBL_EXPBIT0_WORD -# define EXPBIT0_BIT LDBL_EXPBIT0_BIT -# endif -# define SIZE SIZEOF_LDBL -# define L_(literal) literal##L -#elif ! defined USE_FLOAT -# define FUNC rpl_isnand -# define DOUBLE double -# define MAX_EXP DBL_MAX_EXP -# define MIN_EXP DBL_MIN_EXP -# if defined DBL_EXPBIT0_WORD && defined DBL_EXPBIT0_BIT -# define KNOWN_EXPBIT0_LOCATION -# define EXPBIT0_WORD DBL_EXPBIT0_WORD -# define EXPBIT0_BIT DBL_EXPBIT0_BIT -# endif -# define SIZE SIZEOF_DBL -# define L_(literal) literal -#else /* defined USE_FLOAT */ -# define FUNC rpl_isnanf -# define DOUBLE float -# define MAX_EXP FLT_MAX_EXP -# define MIN_EXP FLT_MIN_EXP -# if defined FLT_EXPBIT0_WORD && defined FLT_EXPBIT0_BIT -# define KNOWN_EXPBIT0_LOCATION -# define EXPBIT0_WORD FLT_EXPBIT0_WORD -# define EXPBIT0_BIT FLT_EXPBIT0_BIT -# endif -# define SIZE SIZEOF_FLT -# define L_(literal) literal##f -#endif - -#define EXP_MASK ((MAX_EXP - MIN_EXP) | 7) - -#define NWORDS \ - ((sizeof (DOUBLE) + sizeof (unsigned int) - 1) / sizeof (unsigned int)) -typedef union { DOUBLE value; unsigned int word[NWORDS]; } memory_double; - -int -FUNC (DOUBLE x) -{ -#ifdef KNOWN_EXPBIT0_LOCATION -# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE - /* Special CPU dependent code is needed to treat bit patterns outside the - IEEE 754 specification (such as Pseudo-NaNs, Pseudo-Infinities, - Pseudo-Zeroes, Unnormalized Numbers, and Pseudo-Denormals) as NaNs. - These bit patterns are: - - exponent = 0x0001..0x7FFF, mantissa bit 63 = 0, - - exponent = 0x0000, mantissa bit 63 = 1. - The NaN bit pattern is: - - exponent = 0x7FFF, mantissa >= 0x8000000000000001. */ - memory_double m; - unsigned int exponent; - - m.value = x; - exponent = (m.word[EXPBIT0_WORD] >> EXPBIT0_BIT) & EXP_MASK; -# ifdef WORDS_BIGENDIAN - /* Big endian: EXPBIT0_WORD = 0, EXPBIT0_BIT = 16. */ - if (exponent == 0) - return 1 & (m.word[0] >> 15); - else if (exponent == EXP_MASK) - return (((m.word[0] ^ 0x8000U) << 16) | m.word[1] | (m.word[2] >> 16)) != 0; - else - return 1 & ~(m.word[0] >> 15); -# else - /* Little endian: EXPBIT0_WORD = 2, EXPBIT0_BIT = 0. */ - if (exponent == 0) - return (m.word[1] >> 31); - else if (exponent == EXP_MASK) - return ((m.word[1] ^ 0x80000000U) | m.word[0]) != 0; - else - return (m.word[1] >> 31) ^ 1; -# endif -# else - /* Be careful to not do any floating-point operation on x, such as x == x, - because x may be a signaling NaN. */ -# if defined __SUNPRO_C || defined __ICC || defined _MSC_VER \ - || defined __DECC || defined __TINYC__ \ - || (defined __sgi && !defined __GNUC__) - /* The Sun C 5.0, Intel ICC 10.0, Microsoft Visual C/C++ 9.0, Compaq (ex-DEC) - 6.4, and TinyCC compilers don't recognize the initializers as constant - expressions. The Compaq compiler also fails when constant-folding - 0.0 / 0.0 even when constant-folding is not required. The Microsoft - Visual C/C++ compiler also fails when constant-folding 1.0 / 0.0 even - when constant-folding is not required. The SGI MIPSpro C compiler - complains about "floating-point operation result is out of range". */ - static DOUBLE zero = L_(0.0); - memory_double nan; - DOUBLE plus_inf = L_(1.0) / zero; - DOUBLE minus_inf = -L_(1.0) / zero; - nan.value = zero / zero; -# else - static memory_double nan = { L_(0.0) / L_(0.0) }; - static DOUBLE plus_inf = L_(1.0) / L_(0.0); - static DOUBLE minus_inf = -L_(1.0) / L_(0.0); -# endif - { - memory_double m; - - /* A NaN can be recognized through its exponent. But exclude +Infinity and - -Infinity, which have the same exponent. */ - m.value = x; - if (((m.word[EXPBIT0_WORD] ^ nan.word[EXPBIT0_WORD]) - & (EXP_MASK << EXPBIT0_BIT)) - == 0) - return (memcmp (&m.value, &plus_inf, SIZE) != 0 - && memcmp (&m.value, &minus_inf, SIZE) != 0); - else - return 0; - } -# endif -#else - /* The configuration did not find sufficient information. Give up about - the signaling NaNs, handle only the quiet NaNs. */ - if (x == x) - { -# if defined USE_LONG_DOUBLE && ((defined __ia64 && LDBL_MANT_DIG == 64) || (defined __x86_64__ || defined __amd64__) || (defined __i386 || defined __i386__ || defined _I386 || defined _M_IX86 || defined _X86_)) && !HAVE_SAME_LONG_DOUBLE_AS_DOUBLE - /* Detect any special bit patterns that pass ==; see comment above. */ - memory_double m1; - memory_double m2; - - memset (&m1.value, 0, SIZE); - memset (&m2.value, 0, SIZE); - m1.value = x; - m2.value = x + (x ? 0.0L : -0.0L); - if (memcmp (&m1.value, &m2.value, SIZE) != 0) - return 1; -# endif - return 0; - } - else - return 1; -#endif -} |