1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 2003 Peter Wemm. 5 * Copyright (c) 1990 Andrew Moore, Talke Studio 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 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 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#) ieeefp.h 1.0 (Berkeley) 9/23/93 37 * $FreeBSD$ 38 */ 39 40 #ifndef _MACHINE_IEEEFP_H_ 41 #define _MACHINE_IEEEFP_H_ 42 43 /* Deprecated historical FPU control interface */ 44 45 #include <x86/x86_ieeefp.h> 46 47 static __inline fp_rnd_t 48 fpgetround(void) 49 { 50 unsigned short _cw; 51 52 __fnstcw(&_cw); 53 return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF)); 54 } 55 56 static __inline fp_rnd_t 57 fpsetround(fp_rnd_t _m) 58 { 59 fp_rnd_t _p; 60 unsigned short _cw, _newcw; 61 62 __fnstcw(&_cw); 63 _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF); 64 _newcw = _cw & ~FP_RND_FLD; 65 _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD; 66 __fnldcw(_cw, _newcw); 67 return (_p); 68 } 69 70 static __inline fp_prec_t 71 fpgetprec(void) 72 { 73 unsigned short _cw; 74 75 __fnstcw(&_cw); 76 return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF)); 77 } 78 79 static __inline fp_prec_t 80 fpsetprec(fp_prec_t _m) 81 { 82 fp_prec_t _p; 83 unsigned short _cw, _newcw; 84 85 __fnstcw(&_cw); 86 _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF); 87 _newcw = _cw & ~FP_PRC_FLD; 88 _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD; 89 __fnldcw(_cw, _newcw); 90 return (_p); 91 } 92 93 /* 94 * Get or set the exception mask. 95 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1 96 * means disable for x87 and SSE, but for fp*mask() it means enable. 97 */ 98 99 static __inline fp_except_t 100 fpgetmask(void) 101 { 102 unsigned short _cw; 103 104 __fnstcw(&_cw); 105 return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF); 106 } 107 108 static __inline fp_except_t 109 fpsetmask(fp_except_t _m) 110 { 111 fp_except_t _p; 112 unsigned short _cw, _newcw; 113 114 __fnstcw(&_cw); 115 _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF; 116 _newcw = _cw & ~FP_MSKS_FLD; 117 _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD; 118 __fnldcw(_cw, _newcw); 119 return (_p); 120 } 121 122 static __inline fp_except_t 123 fpgetsticky(void) 124 { 125 unsigned _ex; 126 unsigned short _sw; 127 128 __fnstsw(&_sw); 129 _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF; 130 return ((fp_except_t)_ex); 131 } 132 133 static __inline fp_except_t 134 fpresetsticky(fp_except_t _m) 135 { 136 struct { 137 unsigned _cw; 138 unsigned _sw; 139 unsigned _other[5]; 140 } _env; 141 fp_except_t _p; 142 143 _m &= FP_STKY_FLD >> FP_STKY_OFF; 144 _p = fpgetsticky(); 145 if ((_p & ~_m) == _p) 146 return (_p); 147 if ((_p & ~_m) == 0) { 148 __fnclex(); 149 return (_p); 150 } 151 __fnstenv(&_env); 152 _env._sw &= ~_m; 153 __fldenv(&_env); 154 return (_p); 155 } 156 157 #endif /* !_MACHINE_IEEEFP_H_ */ 158