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glibc  2.9
mathdef.h
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00001 /* Copyright (C) 1997, 1998, 1999, 2000, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #if !defined _MATH_H && !defined _COMPLEX_H
00020 # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
00021 #endif
00022 
00023 #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
00024 # define _MATH_H_MATHDEF    1
00025 
00026 # if defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0
00027 /* When using -mfpmath=sse, values are computed with the precission of the
00028    used type.  */
00029 typedef float float_t;             /* `float' expressions are evaluated as `float'.  */
00030 typedef double double_t;    /* `double' expressions are evaluated as
00031                                `double'.  */
00032 # else
00033 /* The ix87 FPUs evaluate all values in the 80 bit floating-point format
00034    which is also available for the user as `long double'.  Therefore we
00035    define:  */
00036 typedef long double float_t;       /* `float' expressions are evaluated as
00037                                `long double'.  */
00038 typedef long double double_t;      /* `double' expressions are evaluated as
00039                                `long double'.  */
00040 # endif
00041 
00042 /* The values returned by `ilogb' for 0 and NaN respectively.  */
00043 # define FP_ILOGB0   (-2147483647 - 1)
00044 # define FP_ILOGBNAN (-2147483647 - 1)
00045 
00046 #endif /* ISO C99 */