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 */ 38 39 #ifndef _MACHINE_IEEEFP_H_ 40 #define _MACHINE_IEEEFP_H_ 41 42 /* Deprecated historical FPU control interface */ 43 44 #include <x86/x86_ieeefp.h> 45 46 static __inline fp_rnd_t 47 fpgetround(void) 48 { 49 unsigned short _cw; 50 51 __fnstcw(&_cw); 52 return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF)); 53 } 54 55 static __inline fp_rnd_t 56 fpsetround(fp_rnd_t _m) 57 { 58 fp_rnd_t _p; 59 unsigned short _cw, _newcw; 60 61 __fnstcw(&_cw); 62 _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF); 63 _newcw = _cw & ~FP_RND_FLD; 64 _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD; 65 __fnldcw(_cw, _newcw); 66 return (_p); 67 } 68 69 static __inline fp_prec_t 70 fpgetprec(void) 71 { 72 unsigned short _cw; 73 74 __fnstcw(&_cw); 75 return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF)); 76 } 77 78 static __inline fp_prec_t 79 fpsetprec(fp_prec_t _m) 80 { 81 fp_prec_t _p; 82 unsigned short _cw, _newcw; 83 84 __fnstcw(&_cw); 85 _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF); 86 _newcw = _cw & ~FP_PRC_FLD; 87 _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD; 88 __fnldcw(_cw, _newcw); 89 return (_p); 90 } 91 92 /* 93 * Get or set the exception mask. 94 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1 95 * means disable for x87 and SSE, but for fp*mask() it means enable. 96 */ 97 98 static __inline fp_except_t 99 fpgetmask(void) 100 { 101 unsigned short _cw; 102 103 __fnstcw(&_cw); 104 return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF); 105 } 106 107 static __inline fp_except_t 108 fpsetmask(fp_except_t _m) 109 { 110 fp_except_t _p; 111 unsigned short _cw, _newcw; 112 113 __fnstcw(&_cw); 114 _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF; 115 _newcw = _cw & ~FP_MSKS_FLD; 116 _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD; 117 __fnldcw(_cw, _newcw); 118 return (_p); 119 } 120 121 static __inline fp_except_t 122 fpgetsticky(void) 123 { 124 unsigned _ex; 125 unsigned short _sw; 126 127 __fnstsw(&_sw); 128 _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF; 129 return ((fp_except_t)_ex); 130 } 131 132 static __inline fp_except_t 133 fpresetsticky(fp_except_t _m) 134 { 135 struct { 136 unsigned _cw; 137 unsigned _sw; 138 unsigned _other[5]; 139 } _env; 140 fp_except_t _p; 141 142 _m &= FP_STKY_FLD >> FP_STKY_OFF; 143 _p = fpgetsticky(); 144 if ((_p & ~_m) == _p) 145 return (_p); 146 if ((_p & ~_m) == 0) { 147 __fnclex(); 148 return (_p); 149 } 150 __fnstenv(&_env); 151 _env._sw &= ~_m; 152 __fldenv(&_env); 153 return (_p); 154 } 155 156 #endif /* !_MACHINE_IEEEFP_H_ */ 157