71 lines
2.5 KiB
C
71 lines
2.5 KiB
C
/*
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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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* $FreeBSD: src/lib/msun/bsdsrc/mathimpl.h,v 1.7 2005/11/18 05:03:12 bde Exp $
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*/
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#ifndef _MATHIMPL_H_
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#define _MATHIMPL_H_
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#include "cdefs-compat.h"
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#include "math_private.h"
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/*
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* TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an
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* IEEE double variable to zero. It must be expression-like for syntactic
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* reasons, and we implement this expression using an inline function
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* instead of a pure macro to avoid depending on the gcc feature of
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* statement-expressions.
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*/
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#define TRUNC(d) (_b_trunc(&(d)))
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static __inline void
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_b_trunc(volatile double *_dp)
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{
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//VBS
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//u_int32_t _lw;
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u_int32_t _lw;
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GET_LOW_WORD(_lw, *_dp);
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SET_LOW_WORD(*_dp, _lw & 0xf8000000);
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}
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struct Double {
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double a;
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double b;
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};
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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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double __exp__D(double, double);
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struct Double __log__D(double);
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#endif /* !_MATHIMPL_H_ */
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