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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)mathimpl.h 8.1 (Berkeley) 6/4/93 34 * $FreeBSD$ 35 */ 36 37 #ifndef _MATHIMPL_H_ 38 #define _MATHIMPL_H_ 39 40 #include <sys/cdefs.h> 41 #include <math.h> 42 43 #include "../src/math_private.h" 44 45 /* 46 * TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an 47 * IEEE double variable to zero. It must be expression-like for syntactic 48 * reasons, and we implement this expression using an inline function 49 * instead of a pure macro to avoid depending on the gcc feature of 50 * statement-expressions. 51 */ 52 #define TRUNC(d) (_b_trunc(&(d))) 53 54 static __inline void 55 _b_trunc(volatile double *_dp) 56 { 57 uint32_t _lw; 58 59 GET_LOW_WORD(_lw, *_dp); 60 SET_LOW_WORD(*_dp, _lw & 0xf8000000); 61 } 62 63 struct Double { 64 double a; 65 double b; 66 }; 67 68 /* 69 * Functions internal to the math package, yet not static. 70 */ 71 double __exp__D(double, double); 72 struct Double __log__D(double); 73 74 #endif /* !_MATHIMPL_H_ */ 75