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101 lines
2.9 KiB
C
101 lines
2.9 KiB
C
/* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity).
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Used by <stdlib.h> and <math.h> functions for overflow.
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Copyright (C) 1992, 1995, 1996, 1997, 1999 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _MATH_H
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# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
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#endif
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#include <features.h>
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#include <bits/wordsize.h>
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/* IEEE positive infinity (-HUGE_VAL is negative infinity). */
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#ifdef __GNUC__
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# define HUGE_VAL \
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(__extension__ \
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((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; }) \
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{ __l: 0x7ff0000000000000ULL }).__d)
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#else /* not GCC */
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typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
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# define __HUGE_VAL_bytes { 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }
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static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
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# define HUGE_VAL (__huge_val.__d)
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#endif /* GCC. */
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/* ISO C 9X extensions: (float) HUGE_VALF and (long double) HUGE_VALL. */
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#ifdef __USE_ISOC9X
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# ifdef __GNUC__
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# define HUGE_VALF \
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(__extension__ \
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((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; }) \
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{ __l: 0x7f800000UL }).__d)
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# else /* not GCC */
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typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
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# define __HUGE_VALF_bytes { 0x7f, 0x80, 0, 0 }
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static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
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# define HUGE_VALF (__huge_valf.__f)
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# endif /* GCC. */
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#if __WORDSIZE == 32
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/* Sparc32 has IEEE 754 64bit long double */
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# define HUGE_VALL HUGE_VAL
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#else
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/* Sparc64 uses IEEE 754 128bit long double */
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#ifdef __GNUC__
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# define HUGE_VALL \
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(__extension__ \
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((union { struct { unsigned long __h, __l; } __i; long double __d; }) \
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{ __i: { __h: 0x7fff000000000000UL, __l: 0 } }).__d)
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#else /* not GCC */
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typedef union { unsigned char __c[16]; long double __d; } __huge_vall_t;
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# define __HUGE_VALL_bytes { 0x7f, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }
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static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
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# define HUGE_VALL (__huge_vall.__d)
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#endif /* GCC. */
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#endif
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#endif /* __USE_ISOC9X. */
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