1 /* $OpenBSD: fenv.h,v 1.3 2011/05/25 21:46:49 martynas Exp $ */ 2 3 /* 4 * Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org> 5 * 6 * Permission to use, copy, modify, and distribute this software for any 7 * purpose with or without fee is hereby granted, provided that the above 8 * copyright notice and this permission notice appear in all copies. 9 * 10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 17 */ 18 19 #ifndef _ALPHA_FENV_H_ 20 #define _ALPHA_FENV_H_ 21 22 /* 23 * Each symbol representing a floating point exception expands to an integer 24 * constant expression with values, such that bitwise-inclusive ORs of _all 25 * combinations_ of the constants result in distinct values. 26 * 27 * We use such values that allow direct bitwise operations on FPU registers. 28 */ 29 #define FE_INVALID 0x01 30 #define FE_DIVBYZERO 0x02 31 #define FE_OVERFLOW 0x04 32 #define FE_UNDERFLOW 0x08 33 #define FE_INEXACT 0x10 34 35 /* 36 * The following symbol is simply the bitwise-inclusive OR of all floating-point 37 * exception constants defined above. 38 */ 39 #define FE_ALL_EXCEPT (FE_INVALID | FE_DIVBYZERO | FE_OVERFLOW | \ 40 FE_UNDERFLOW) 41 42 /* 43 * Each symbol representing the rounding direction, expands to an integer 44 * constant expression whose value is distinct non-negative value. 45 * 46 * We use such values that allow direct bitwise operations on FPU registers. 47 */ 48 #define FE_TOWARDZERO 0x0 49 #define FE_DOWNWARD 0x1 50 #define FE_TONEAREST 0x2 51 #define FE_UPWARD 0x3 52 53 /* 54 * The following symbol is simply the bitwise-inclusive OR of all floating-point 55 * rounding direction constants defined above. 56 */ 57 #define _ROUND_MASK (FE_TOWARDZERO | FE_DOWNWARD | FE_TONEAREST | \ 58 FE_UPWARD) 59 #define _ROUND_SHIFT 58 60 61 /* 62 * fenv_t represents the entire floating-point environment. 63 */ 64 typedef struct { 65 unsigned int __sticky; 66 unsigned int __mask; 67 unsigned int __round; 68 } fenv_t; 69 70 /* 71 * The following constant represents the default floating-point environment 72 * (that is, the one installed at program startup) and has type pointer to 73 * const-qualified fenv_t. 74 * 75 * It can be used as an argument to the functions within the <fenv.h> header 76 * that manage the floating-point environment, namely fesetenv() and 77 * feupdateenv(). 78 */ 79 __BEGIN_DECLS 80 extern fenv_t __fe_dfl_env; 81 __END_DECLS 82 #define FE_DFL_ENV ((const fenv_t *)&__fe_dfl_env) 83 84 /* 85 * fexcept_t represents the floating-point status flags collectively, including 86 * any status the implementation associates with the flags. 87 * 88 * A floating-point status flag is a system variable whose value is set (but 89 * never cleared) when a floating-point exception is raised, which occurs as a 90 * side effect of exceptional floating-point arithmetic to provide auxiliary 91 * information. 92 * 93 * A floating-point control mode is a system variable whose value may be set by 94 * the user to affect the subsequent behavior of floating-point arithmetic. 95 */ 96 typedef unsigned int fexcept_t; 97 98 #endif /* !_ALPHA_FENV_H_ */ 99