1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 <sys/_types.h> 35 #include <machine/endian.h> 36 37 #ifndef __fenv_static 38 #define __fenv_static static 39 #endif 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 typedef int fenv_t; 46 typedef int fexcept_t; 47 48 /* Exception flags */ 49 #define FE_INEXACT 0x02000000 50 #define FE_DIVBYZERO 0x04000000 51 #define FE_UNDERFLOW 0x08000000 52 #define FE_OVERFLOW 0x10000000 53 #define FE_INVALID 0x20000000 /* all types of invalid FP ops */ 54 55 /* 56 * The PowerPC architecture has extra invalid flags that indicate the 57 * specific type of invalid operation occurred. These flags may be 58 * tested, set, and cleared---but not masked---separately. All of 59 * these bits are cleared when FE_INVALID is cleared, but only 60 * FE_VXSOFT is set when FE_INVALID is explicitly set in software. 61 */ 62 #define FE_VXCVI 0x00000100 /* invalid integer convert */ 63 #define FE_VXSQRT 0x00000200 /* square root of a negative */ 64 #define FE_VXSOFT 0x00000400 /* software-requested exception */ 65 #define FE_VXVC 0x00080000 /* ordered comparison involving NaN */ 66 #define FE_VXIMZ 0x00100000 /* inf * 0 */ 67 #define FE_VXZDZ 0x00200000 /* 0 / 0 */ 68 #define FE_VXIDI 0x00400000 /* inf / inf */ 69 #define FE_VXISI 0x00800000 /* inf - inf */ 70 #define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */ 71 #define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \ 72 FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \ 73 FE_VXSNAN | FE_INVALID) 74 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 75 FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 76 77 /* Rounding modes */ 78 #define FE_TONEAREST 0x0000 79 #define FE_TOWARDZERO 0x0001 80 #define FE_UPWARD 0x0002 81 #define FE_DOWNWARD 0x0003 82 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 83 FE_UPWARD | FE_TOWARDZERO) 84 85 86 87 /* Default floating-point environment */ 88 extern fenv_t _fe_dfl_env; 89 #define FE_DFL_ENV ((const fenv_t *) &_fe_dfl_env) 90 91 /* We need to be able to map status flag positions to mask flag positions */ 92 #define _FPUSW_SHIFT 22 93 #define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ 94 FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT) 95 96 #ifndef _SOFT_FLOAT 97 #ifdef __SPE__ 98 #define __mffs(__env) \ 99 __asm __volatile("mfspr %0, 512" : "=r" ((__env)->__bits.__reg)) 100 #define __mtfsf(__env) \ 101 __asm __volatile("mtspr 512,%0;isync" :: "r" ((__env).__bits.__reg)) 102 #else 103 #define __mffs(__env) \ 104 __asm __volatile("mffs %0" : "=f" ((__env)->__d)) 105 #define __mtfsf(__env) \ 106 __asm __volatile("mtfsf 255,%0" :: "f" ((__env).__d)) 107 #endif 108 #else 109 #define __mffs(__env) 110 #define __mtfsf(__env) 111 #endif 112 113 union __fpscr { 114 double __d; 115 struct { 116 #if _BYTE_ORDER == _LITTLE_ENDIAN 117 fenv_t __reg; 118 __uint32_t __junk; 119 #else 120 __uint32_t __junk; 121 fenv_t __reg; 122 #endif 123 } __bits; 124 }; 125 126 127 #ifdef __cplusplus 128 } 129 #endif 130 131 132 #endif /* !_SYS_FENV_H_ */ 133
