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 #ifdef __GNUCLIKE_ASM 48 49 static __inline fp_rnd_t 50 fpgetround(void) 51 { 52 unsigned short _cw; 53 54 __fnstcw(&_cw); 55 return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF)); 56 } 57 58 static __inline fp_rnd_t 59 fpsetround(fp_rnd_t _m) 60 { 61 fp_rnd_t _p; 62 unsigned short _cw, _newcw; 63 64 __fnstcw(&_cw); 65 _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF); 66 _newcw = _cw & ~FP_RND_FLD; 67 _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD; 68 __fnldcw(_cw, _newcw); 69 return (_p); 70 } 71 72 static __inline fp_prec_t 73 fpgetprec(void) 74 { 75 unsigned short _cw; 76 77 __fnstcw(&_cw); 78 return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF)); 79 } 80 81 static __inline fp_prec_t 82 fpsetprec(fp_prec_t _m) 83 { 84 fp_prec_t _p; 85 unsigned short _cw, _newcw; 86 87 __fnstcw(&_cw); 88 _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF); 89 _newcw = _cw & ~FP_PRC_FLD; 90 _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD; 91 __fnldcw(_cw, _newcw); 92 return (_p); 93 } 94 95 /* 96 * Get or set the exception mask. 97 * Note that the x87 mask bits are inverted by the API -- a mask bit of 1 98 * means disable for x87 and SSE, but for fp*mask() it means enable. 99 */ 100 101 static __inline fp_except_t 102 fpgetmask(void) 103 { 104 unsigned short _cw; 105 106 __fnstcw(&_cw); 107 return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF); 108 } 109 110 static __inline fp_except_t 111 fpsetmask(fp_except_t _m) 112 { 113 fp_except_t _p; 114 unsigned short _cw, _newcw; 115 116 __fnstcw(&_cw); 117 _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF; 118 _newcw = _cw & ~FP_MSKS_FLD; 119 _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD; 120 __fnldcw(_cw, _newcw); 121 return (_p); 122 } 123 124 static __inline fp_except_t 125 fpgetsticky(void) 126 { 127 unsigned _ex; 128 unsigned short _sw; 129 130 __fnstsw(&_sw); 131 _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF; 132 return ((fp_except_t)_ex); 133 } 134 135 static __inline fp_except_t 136 fpresetsticky(fp_except_t _m) 137 { 138 struct { 139 unsigned _cw; 140 unsigned _sw; 141 unsigned _other[5]; 142 } _env; 143 fp_except_t _p; 144 145 _m &= FP_STKY_FLD >> FP_STKY_OFF; 146 _p = fpgetsticky(); 147 if ((_p & ~_m) == _p) 148 return (_p); 149 if ((_p & ~_m) == 0) { 150 __fnclex(); 151 return (_p); 152 } 153 __fnstenv(&_env); 154 _env._sw &= ~_m; 155 __fldenv(&_env); 156 return (_p); 157 } 158 159 #endif /* __GNUCLIKE_ASM */ 160 161 #endif /* !_MACHINE_IEEEFP_H_ */ 162