1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1988, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef _MATHIMPL_H_ 37 #define _MATHIMPL_H_ 38 39 #include <sys/cdefs.h> 40 #include <math.h> 41 42 #include "../src/math_private.h" 43 44 /* 45 * TRUNC() is a macro that sets the trailing 27 bits in the mantissa of an 46 * IEEE double variable to zero. It must be expression-like for syntactic 47 * reasons, and we implement this expression using an inline function 48 * instead of a pure macro to avoid depending on the gcc feature of 49 * statement-expressions. 50 */ 51 #define TRUNC(d) (_b_trunc(&(d))) 52 53 static __inline void 54 _b_trunc(volatile double *_dp) 55 { 56 uint32_t _lw; 57 58 GET_LOW_WORD(_lw, *_dp); 59 SET_LOW_WORD(*_dp, _lw & 0xf8000000); 60 } 61 62 struct Double { 63 double a; 64 double b; 65 }; 66 67 /* 68 * Functions internal to the math package, yet not static. 69 */ 70 double __exp__D(double, double); 71 struct Double __log__D(double); 72 73 #endif /* !_MATHIMPL_H_ */ 74