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 37 #ifndef _MACHINE_IEEEFP_H_ 38 #define _MACHINE_IEEEFP_H_ 39 40 /* Deprecated historical FPU control interface */ 41 42 #include <x86/x86_ieeefp.h> 43 44 static __inline fp_rnd_t 45 fpgetround(void) 46 { 47 unsigned short _cw; 48 49 __fnstcw(&_cw); 50 return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF)); 51 } 52 53 static __inline fp_rnd_t 54 fpsetround(fp_rnd_t _m) 55 { 56 fp_rnd_t _p; 57 unsigned short _cw, _newcw; 58 59 __fnstcw(&_cw); 60 _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF); 61 _newcw = _cw & ~FP_RND_FLD; 62 _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD; 63 __fnldcw(_cw, _newcw); 64 return (_p); 65 } 66 67 static __inline fp_prec_t 68 fpgetprec(void) 69 { 70 unsigned short _cw; 71 72 __fnstcw(&_cw); 73 return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF)); 74 } 75 76 static __inline fp_prec_t 77 fpsetprec(fp_prec_t _m) 78 { 79 fp_prec_t _p; 80 unsigned short _cw, _newcw; 81 82 __fnstcw(&_cw); 83 _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF); 84 _newcw = _cw & ~FP_PRC_FLD; 85 _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD; 86 __fnldcw(_cw, _newcw); 87 return (_p); 88 } 89 90 /* 91 * Get or set the exception mask. 92 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1 93 * means disable for x87 and SSE, but for fp*mask() it means enable. 94 */ 95 96 static __inline fp_except_t 97 fpgetmask(void) 98 { 99 unsigned short _cw; 100 101 __fnstcw(&_cw); 102 return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF); 103 } 104 105 static __inline fp_except_t 106 fpsetmask(fp_except_t _m) 107 { 108 fp_except_t _p; 109 unsigned short _cw, _newcw; 110 111 __fnstcw(&_cw); 112 _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF; 113 _newcw = _cw & ~FP_MSKS_FLD; 114 _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD; 115 __fnldcw(_cw, _newcw); 116 return (_p); 117 } 118 119 static __inline fp_except_t 120 fpgetsticky(void) 121 { 122 unsigned _ex; 123 unsigned short _sw; 124 125 __fnstsw(&_sw); 126 _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF; 127 return ((fp_except_t)_ex); 128 } 129 130 static __inline fp_except_t 131 fpresetsticky(fp_except_t _m) 132 { 133 struct { 134 unsigned _cw; 135 unsigned _sw; 136 unsigned _other[5]; 137 } _env; 138 fp_except_t _p; 139 140 _m &= FP_STKY_FLD >> FP_STKY_OFF; 141 _p = fpgetsticky(); 142 if ((_p & ~_m) == _p) 143 return (_p); 144 if ((_p & ~_m) == 0) { 145 __fnclex(); 146 return (_p); 147 } 148 __fnstenv(&_env); 149 _env._sw &= ~_m; 150 __fldenv(&_env); 151 return (_p); 152 } 153 154 #endif /* !_MACHINE_IEEEFP_H_ */ 155