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/cdefs.h> 35 36 #ifdef __cplusplus 37 extern "C" { 38 #endif 39 40 typedef int fenv_t; 41 typedef int fexcept_t; 42 43 /* Exception flags */ 44 #define FE_INEXACT 0x02000000 45 #define FE_DIVBYZERO 0x04000000 46 #define FE_UNDERFLOW 0x08000000 47 #define FE_OVERFLOW 0x10000000 48 #define FE_INVALID 0x20000000 /* all types of invalid FP ops */ 49 50 /* 51 * The PowerPC architecture has extra invalid flags that indicate the 52 * specific type of invalid operation occurred. These flags may be 53 * tested, set, and cleared---but not masked---separately. All of 54 * these bits are cleared when FE_INVALID is cleared, but only 55 * FE_VXSOFT is set when FE_INVALID is explicitly set in software. 56 */ 57 #define FE_VXCVI 0x00000100 /* invalid integer convert */ 58 #define FE_VXSQRT 0x00000200 /* square root of a negative */ 59 #define FE_VXSOFT 0x00000400 /* software-requested exception */ 60 #define FE_VXVC 0x00080000 /* ordered comparison involving NaN */ 61 #define FE_VXIMZ 0x00100000 /* inf * 0 */ 62 #define FE_VXZDZ 0x00200000 /* 0 / 0 */ 63 #define FE_VXIDI 0x00400000 /* inf / inf */ 64 #define FE_VXISI 0x00800000 /* inf - inf */ 65 #define FE_VXSNAN 0x01000000 /* operation on a signalling NaN */ 66 #define FE_ALL_INVALID (FE_VXCVI | FE_VXSQRT | FE_VXSOFT | FE_VXVC | \ 67 FE_VXIMZ | FE_VXZDZ | FE_VXIDI | FE_VXISI | \ 68 FE_VXSNAN | FE_INVALID) 69 #define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | \ 70 FE_ALL_INVALID | FE_OVERFLOW | FE_UNDERFLOW) 71 72 /* Rounding modes */ 73 #define FE_TONEAREST 0x0000 74 #define FE_TOWARDZERO 0x0001 75 #define FE_UPWARD 0x0002 76 #define FE_DOWNWARD 0x0003 77 #define _ROUND_MASK (FE_TONEAREST | FE_DOWNWARD | \ 78 FE_UPWARD | FE_TOWARDZERO) 79 80 81 82 /* Default floating-point environment */ 83 extern fenv_t _fe_dfl_env; 84 #define FE_DFL_ENV ((const fenv_t *) &_fe_dfl_env) 85 86 /* We need to be able to map status flag positions to mask flag positions */ 87 #define _FPUSW_SHIFT 22 88 #define _ENABLE_MASK ((FE_DIVBYZERO | FE_INEXACT | FE_INVALID | \ 89 FE_OVERFLOW | FE_UNDERFLOW) >> _FPUSW_SHIFT) 90 91 #ifndef _SOFT_FLOAT 92 #ifdef __SPE__ 93 #define __mffs(__env) \ 94 __asm __volatile("mfspr %0, 512" : "=r" ((__env)->__bits.__reg)) 95 #define __mtfsf(__env) \ 96 __asm __volatile("mtspr 512,%0;isync" :: "r" ((__env).__bits.__reg)) 97 #else 98 #define __mffs(__env) \ 99 __asm __volatile("mffs %0" : "=f" ((__env)->__d)) 100 #define __mtfsf(__env) \ 101 __asm __volatile("mtfsf 255,%0" :: "f" ((__env).__d)) 102 #endif 103 #else 104 #define __mffs(__env) 105 #define __mtfsf(__env) 106 #endif 107 108 union __fpscr { 109 double __d; 110 struct { 111 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ 112 fenv_t __reg; 113 __uint32_t __junk; 114 #else 115 __uint32_t __junk; 116 fenv_t __reg; 117 #endif 118 } __bits; 119 }; 120 121 #if !defined(__declare_fenv_inline) && defined(__declare_extern_inline) 122 #define __declare_fenv_inline(type) __declare_extern_inline(type) 123 #endif 124 125 #ifdef __declare_fenv_inline 126 #include <machine/fenv-fp.h> 127 #endif 128 129 #ifdef __cplusplus 130 } 131 #endif 132 133 #endif /* !_SYS_FENV_H_ */ 134
