126 lines
4.3 KiB
C
126 lines
4.3 KiB
C
/* $NetBSD: mathimpl.h,v 1.10 2011/11/02 02:34:56 christos Exp $ */
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/*
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mathimpl.h 8.1 (Berkeley) 6/4/93
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*/
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#ifndef _NOIEEE_SRC_MATHIMPL_H_
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#define _NOIEEE_SRC_MATHIMPL_H_
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#include <sys/cdefs.h>
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#include <math.h>
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#include <stdint.h>
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#if defined(__vax__) || defined(tahoe)
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/* Deal with different ways to concatenate in cpp */
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#define cat3(a,b,c) a ## b ## c
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/* Deal with vax/tahoe byte order issues */
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# ifdef __vax__
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# define cat3t(a,b,c) cat3(a,b,c)
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# else
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# define cat3t(a,b,c) cat3(a,c,b)
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# endif
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# define vccast(name) (cat3(__,name,x).d)
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/*
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* Define a constant to high precision on a Vax or Tahoe.
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*
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* Args are the name to define, the decimal floating point value,
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* four 16-bit chunks of the float value in hex
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* (because the vax and tahoe differ in float format!), the power
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* of 2 of the hex-float exponent, and the hex-float mantissa.
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* Most of these arguments are not used at compile time; they are
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* used in a post-check to make sure the constants were compiled
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* correctly.
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*
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* People who want to use the constant will have to do their own
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* #define foo vccast(foo)
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* since CPP cannot do this for them from inside another macro (sigh).
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* We define "vccast" if this needs doing.
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*/
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#ifdef _LIBM_DECLARE
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# define vc(name, value, x1,x2,x3,x4, bexp, xval) \
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const union { uint32_t l[2]; double d; } cat3(__,name,x) = { \
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.l = { [0] = cat3t(0x,x1,x2), [1] = cat3t(0x,x3,x4) } };
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#elif defined(_LIBM_STATIC)
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# define vc(name, value, x1,x2,x3,x4, bexp, xval) \
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static const union { uint32_t l[2]; double d; } cat3(__,name,x) = { \
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.l = { [0] = cat3t(0x,x1,x2), [1] = cat3t(0x,x3,x4) } };
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#else
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# define vc(name, value, x1,x2,x3,x4, bexp, xval) \
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extern const union { uint32_t l[2]; double d; } cat3(__,name,x);
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#endif
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# define ic(name, value, bexp, xval)
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#else /* __vax__ or tahoe */
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/* Hooray, we have an IEEE machine */
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# undef vccast
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# define vc(name, value, x1,x2,x3,x4, bexp, xval)
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#ifdef _LIBM_DECLARE
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# define ic(name, value, bexp, xval) \
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const double __CONCAT(__,name) = value;
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#elif _LIBM_STATIC
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# define ic(name, value, bexp, xval) \
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static const double __CONCAT(__,name) = value;
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#else
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# define ic(name, value, bexp, xval) \
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extern const double __CONCAT(__,name);
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#endif
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#endif /* defined(__vax__)||defined(tahoe) */
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#ifdef __vax__
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#include <machine/float.h>
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#define _TINY DBL_EPSILON
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#define _TINYER DBL_EPSILON
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#define _HUGE DBL_MAX
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#else
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#define _TINY 1e-300
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#define _TINYER 1e-308
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#define _HUGE 1e+300
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#endif
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/*
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* Functions internal to the math package, yet not static.
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*/
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extern double __exp__E(double, double);
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extern double __log__L(double);
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extern int infnan(int);
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struct Double {double a, b;};
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double __exp__D(double, double);
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struct Double __log__D(double);
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#endif /* _NOIEEE_SRC_MATHIMPL_H_ */
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