1 /*- 2 * Copyright (c) 2004-2005 David Schultz <das (at) FreeBSD.ORG> 3 * 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 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #pragma once 28 29 #include <sys/types.h> 30 31 __BEGIN_DECLS 32 33 /* 34 * Each symbol representing a floating point exception expands to an integer 35 * constant expression with values, such that bitwise-inclusive ORs of _all 36 * combinations_ of the constants result in distinct values. 37 * 38 * We use such values that allow direct bitwise operations on FPU/SSE registers. 39 */ 40 #define FE_INVALID 0x01 41 #define FE_DENORMAL 0x02 42 #define FE_DIVBYZERO 0x04 43 #define FE_OVERFLOW 0x08 44 #define FE_UNDERFLOW 0x10 45 #define FE_INEXACT 0x20 46 47 /* 48 * The following symbol is simply the bitwise-inclusive OR of all floating-point 49 * exception constants defined above. 50 */ 51 #define FE_ALL_EXCEPT (FE_INVALID | FE_DENORMAL | FE_DIVBYZERO | \ 52 FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT) 53 54 /* 55 * Each symbol representing the rounding direction, expands to an integer 56 * constant expression whose value is distinct non-negative value. 57 * 58 * We use such values that allow direct bitwise operations on FPU/SSE registers. 59 */ 60 #define FE_TONEAREST 0x000 61 #define FE_DOWNWARD 0x400 62 #define FE_UPWARD 0x800 63 #define FE_TOWARDZERO 0xc00 64 65 /* 66 * fenv_t represents the entire floating-point environment. 67 */ 68 typedef struct { 69 struct { 70 __uint32_t __control; /* Control word register */ 71 __uint32_t __status; /* Status word register */ 72 __uint32_t __tag; /* Tag word register */ 73 __uint32_t __others[4]; /* EIP, Pointer Selector, etc */ 74 } __x87; 75 __uint32_t __mxcsr; /* Control, status register */ 76 } fenv_t; 77 78 /* 79 * fexcept_t represents the floating-point status flags collectively, including 80 * any status the implementation associates with the flags. 81 * 82 * A floating-point status flag is a system variable whose value is set (but 83 * never cleared) when a floating-point exception is raised, which occurs as a 84 * side effect of exceptional floating-point arithmetic to provide auxiliary 85 * information. 86 * 87 * A floating-point control mode is a system variable whose value may be set by 88 * the user to affect the subsequent behavior of floating-point arithmetic. 89 */ 90 typedef __uint32_t fexcept_t; 91 92 __END_DECLS 93
