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Use a builtin __FOO__ for FOO if >= GCC 3.3 

If C99, use hex floating point.
This commit is contained in:
matt 2011-07-07 18:23:18 +00:00
parent 929391d8b0
commit d099c37fe4
1 changed files with 52 additions and 9 deletions
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61
sys/sys/float_ieee754.h
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@ -1,4 +1,4 @@
/* $NetBSD: float_ieee754.h,v 1.8 2005/12/11 12:25:20 christos Exp $ */
/* $NetBSD: float_ieee754.h,v 1.9 2011/07/07 18:23:18 matt Exp $ */
/*
* Copyright (c) 1992, 1993
@ -57,33 +57,72 @@ __END_DECLS
defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE)
#ifndef FLT_EVAL_METHOD
#if __GNUC_PREREQ__(3, 3)
#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
#define FLT_EVAL_METHOD __FLT_EVAL_METHOD__
#endif /* GCC >= 3.3 */
#endif /* defined(FLT_EVAL_METHOD) */
#endif /* !defined(_ANSI_SOURCE) && ... */
#if __GNUC_PREREQ__(3, 3)
/*
* GCC 3,3 and later provide builtins for the FLT, DBL, and LDBL constants.
*/
#define FLT_RADIX __FLT_RADIX__
#define FLT_MANT_DIG __FLT_MANT_DIG__
#define FLT_EPSILON __FLT_EPSILON__
#define FLT_DIG __FLT_DIG__
#define FLT_MIN_EXP __FLT_MIN_EXP__
#define FLT_MIN __FLT_MIN__
#define FLT_MIN_10_EXP __FLT_MIN_10_EXP__
#define FLT_MAX_EXP __FLT_MAX_EXP__
#define FLT_MAX __FLT_MAX__
#define FLT_MAX_10_EXP __FLT_MAX_10_EXP__
#define DBL_MANT_DIG __DBL_MANT_DIG__
#define DBL_EPSILON __DBL_EPSILON__
#define DBL_DIG __DBL_DIG__
#define DBL_MIN_EXP __DBL_MIN_EXP__
#define DBL_MIN __DBL_MIN__
#define DBL_MIN_10_EXP __DBL_MIN_10_EXP__
#define DBL_MAX_EXP __DBL_MAX_EXP__
#define DBL_MAX __DBL_MAX__
#define DBL_MAX_10_EXP __DBL_MAX_10_EXP__
#else /* GCC < 3.3 */
#define FLT_RADIX 2 /* b */
#define FLT_MANT_DIG 24 /* p */
#define FLT_EPSILON 1.19209290E-7F /* b**(1-p) */
#define FLT_DIG 6 /* floor((p-1)*log10(b))+(b == 10) */
#define FLT_MIN_EXP (-125) /* emin */
#define FLT_MIN 1.17549435E-38F /* b**(emin-1) */
#define FLT_MIN_10_EXP (-37) /* ceil(log10(b**(emin-1))) */
#define FLT_MAX_EXP 128 /* emax */
#define FLT_MAX 3.40282347E+38F /* (1-b**(-p))*b**emax */
#define FLT_MAX_10_EXP 38 /* floor(log10((1-b**(-p))*b**emax)) */
#if __STDC_VERSION__ >= 199901L
#define FLT_EPSILON 0x1.0p-23F
#define FLT_MIN 0x1.0p-126F
#define FLT_MAX 0x1.fffffep+127F
#else
#define FLT_EPSILON 1.19209290E-7F /* b**(1-p) */
#define FLT_MIN 1.17549435E-38F /* b**(emin-1) */
#define FLT_MAX 3.40282347E+38F /* (1-b**(-p))*b**emax */
#endif
#define DBL_MANT_DIG 53
#define DBL_EPSILON 2.2204460492503131E-16
#define DBL_DIG 15
#define DBL_MIN_EXP (-1021)
#define DBL_MIN 2.2250738585072014E-308
#define DBL_MIN_10_EXP (-307)
#define DBL_MAX_EXP 1024
#define DBL_MAX 1.7976931348623157E+308
#define DBL_MAX_10_EXP 308
#if __STDC_VERSION__ >= 199901L
#define DBL_EPSILON 0x1.0p-52
#define DBL_MIN 0x1.0p-1022
#define DBL_MAX 0x1.fffffffffffffp+1023
#else
#define DBL_EPSILON 2.2204460492503131E-16
#define DBL_MIN 2.2250738585072014E-308
#define DBL_MAX 1.7976931348623157E+308
#endif
#endif /* GCC < 3.3 */
/*
* If no extended-precision type is defined by the machine-dependent
* header including this, default to `long double' being double-precision.
@ -104,7 +143,11 @@ __END_DECLS
((_POSIX_C_SOURCE - 0) >= 200112L) || \
((_XOPEN_SOURCE - 0) >= 600) || \
defined(_ISOC99_SOURCE) || defined(_NETBSD_SOURCE)
#define DECIMAL_DIG 17 /* ceil((1+p*log10(b))-(b==10) */
#if __GNUC_PREREQ__(3, 3)
#define DECIMAL_DIG __DECIMAL_DIG__
#else
#define DECIMAL_DIG 17 /* ceil((1+p*log10(b))-(b==10) */
#endif
#endif /* !defined(_ANSI_SOURCE) && ... */
#endif /* LDBL_MANT_DIG */