1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)mathimpl.h 8.1 (Berkeley) 6/4/93 30 * $FreeBSD: src/lib/msun/bsdsrc/mathimpl.h,v 1.7 2005/11/18 05:03:12 bde Exp $ 31 */ 32 33 #ifndef _MATHIMPL_H_ 34 #define _MATHIMPL_H_ 35 36 #include "cdefs-compat.h" 37 #include <openlibm.h> 38 39 #include "math_private.h" 40 41 /* 42 * TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an 43 * IEEE double variable to zero. It must be expression-like for syntactic 44 * reasons, and we implement this expression using an inline function 45 * instead of a pure macro to avoid depending on the gcc feature of 46 * statement-expressions. 47 */ 48 #define TRUNC(d) (_b_trunc(&(d))) 49 50 static __inline void 51 _b_trunc(volatile double *_dp) 52 { 53 //VBS 54 //u_int32_t _lw; 55 u_int32_t _lw; 56 57 GET_LOW_WORD(_lw, *_dp); 58 SET_LOW_WORD(*_dp, _lw & 0xf8000000); 59 } 60 61 struct Double { 62 double a; 63 double b; 64 }; 65 66 /* 67 * Functions internal to the math package, yet not static. 68 */ 69 double __exp__D(double, double); 70 struct Double __log__D(double); 71 72 #endif /* !_MATHIMPL_H_ */ 73