1 /* $NetBSD: fenv.h,v 1.2 2017/01/14 12:00:13 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2004-2005 David Schultz <das@FreeBSD.ORG> 5 * 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD$ 29 */ 30 31 #ifndef _SYS_FENV_H_ 32 #define _SYS_FENV_H_ 33 34 #include <stdint.h> 35 36 #ifdef __arch64__ 37 typedef uint64_t fenv_t; 38 typedef uint64_t fexcept_t; 39 #else 40 typedef uint32_t fenv_t; 41 typedef uint32_t fexcept_t; 42 #endif 43 44 /* 45 * Exception flags 46 * 47 * Symbols are defined in such a way, to correspond to the accrued 48 * exception bits (aexc) fields of FSR. 49 */ 50 #define FE_INEXACT 0x00000020 /* 0000100000 */ 51 #define FE_DIVBYZERO 0x00000040 /* 0001000000 */ 52 #define FE_UNDERFLOW 0x00000080 /* 0010000000 */ 53 #define FE_OVERFLOW 0x00000100 /* 0100000000 */ 54 #define FE_INVALID 0x00000200 /* 1000000000 */ 55 56 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 57 FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 58 59 /* 60 * Rounding modes 61 * 62 * We can't just use the hardware bit values here, because that would 63 * make FE_UPWARD and FE_DOWNWARD negative, which is not allowed. 64 */ 65 #define FE_TONEAREST 0 /* round to nearest representable number */ 66 #define FE_TOWARDZERO 1 /* round to zero (truncate) */ 67 #define FE_UPWARD 2 /* round toward positive infinity */ 68 #define FE_DOWNWARD 3 /* round toward negative infinity */ 69 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 70 FE_UPWARD | FE_TOWARDZERO) 71 #define _ROUND_SHIFT 30 72 73 74 75 /* We need to be able to map status flag positions to mask flag positions */ 76 #define _FPUSW_SHIFT 18 77 #define _ENABLE_MASK (FE_ALL_EXCEPT << _FPUSW_SHIFT) 78 79 80 81 #endif /* !_SYS_FENV_H_ */ 82
