| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame] | 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: src/lib/msun/bsdsrc/mathimpl.h,v 1.7 2005/11/18 05:03:12 bde Exp $ |
| 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_ */ |