1 /* 2 (c) Copyright 2019 Joel Sherrill <joel@rtems.org 3 (c) Copyright 2019 Craig Howlang <craig.howland@caci.com> 4 All rights reserved. 5 6 Redistribution and use in source and binary forms, with or without 7 modification, are permitted provided that the following conditions 8 are met: 9 10 1. Redistributions of source code must retain the above copyright 11 notice, this list of conditions and the following disclaimer. 12 13 2. Redistributions in binary form must reproduce the above copyright 14 notice, this list of conditions and the following disclaimer in the 15 documentation and/or other materials provided with the distribution. 16 17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 */ 29 30 #ifndef _SYS_FENV_H_ 31 #define _SYS_FENV_H_ 32 33 /******************************************************************************* 34 * THIS FILE IS A TEMPLATE, INTENDED TO BE USED AS A STARTING POINT FOR 35 * TARGET-SPECIFIC FLOATING-POINT IMPLEMENTATIONS. NOTES BELOW HIGHLIGHT THE 36 * BASICS OF WHAT NEEDS TO BE DEFINED. THE DEFAULT IMPLEMTATION IS 37 * DEGENERATE, WITH ALL FUNCTIONS RETURNING ERROR AND NO EXCEPTIONS AND NO 38 * ROUNDING MODES DEFINED (SINCE NONE ARE SUPPORTED). 39 * THE MACRO VALUES ARE EXAMPLES ONLY, ALTHOUGH TAKEN FROM A WORKING 40 * IMPLEMENTATION. 41 * REMOVE THIS NOTICE WHEN COPYING TO A REAL IMPLEMENTATION, REPLACING IT WITH 42 * ANY TARGET-SPECIFIC NOTES OF INTEREST. THE FENV FUNCTION MAN PAGES POINT TO 43 * THIS FILE AS A MEANS OF DETERMINING A FUNCTIONAL VS. NON-FUNCTIONAL 44 * IMPLEMENTATION. 45 ******************************************************************************/ 46 /* 47 * The following macros are to be defined if the respective exception is 48 * supported by the implementation, each with a unique bit mask: 49 * 50 * FE_DIVBYZERO 51 * FE_INEXACT 52 * FE_INVALID 53 * FE_OVERFLOW 54 * FE_UNDERFLOW 55 * 56 * Other implementation-specific exceptions may be defined, and must start 57 * with FE_ followed by a capital letter. 58 * 59 * FE_ALL_EXCEPT must be defined as the logical OR of all exceptions. 60 */ 61 62 /* 63 #define FE_DIVBYZERO 0x00000001 64 #define FE_INEXACT 0x00000002 65 #define FE_INVALID 0x00000004 66 #define FE_OVERFLOW 0x00000008 67 #define FE_UNDERFLOW 0x00000010 68 69 #define FE_ALL_EXCEPT \ 70 (FE_DIVBYZERO|FE_INEXACT|FE_INVALID|FE_OVERFLOW|FE_UNDERFLOW) 71 */ 72 73 /* 74 * The following macros are to be defined if the respective rounding 75 * direction is supported by the implementation via the fegetround() and 76 * fesetround() functions, each with a unique positive value. 77 * 78 * FE_DOWNWARD 79 * FE_TONEAREST 80 * FE_TOWARDZERO 81 * FE_UPWARD 82 * 83 * Other implementation-specific rounding modes may be defined, and must start 84 * with FE_ followed by a capital letter. 85 */ 86 /* 87 #define FE_DOWNWARD 1 88 #define FE_TONEAREST 2 89 #define FE_TOWARDZERO 3 90 #define FE_UPWARD 4 91 */ 92 93 /* 94 * The following typedefs are required. These should be defined properly 95 * to support the architecture specific implementation. See the C and 96 * POSIX standards for details: 97 * 98 * fenv_t 99 * fexcept_t 100 */ 101 typedef int fenv_t; 102 typedef int fexcept_t; 103 104 #endif /* _SYS_FENV_H_ */ 105
