FreeBSD/Linux Kernel Cross Reference
sys/i386/include/ieeefp.h

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 2003 Peter Wemm.
      * Copyright (c) 1990 Andrew Moore, Talke Studio
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#) ieeefp.h     1.0 (Berkeley) 9/23/93
     * $FreeBSD$
     */
    
    #ifndef _MACHINE_IEEEFP_H_
    #define _MACHINE_IEEEFP_H_
    
    /* Deprecated historical FPU control interface */
    
    #include <x86/x86_ieeefp.h>
    
    static __inline fp_rnd_t
    fpgetround(void)
    {
            unsigned short _cw;
    
            __fnstcw(&_cw);
            return ((fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF));
    }
    
    static __inline fp_rnd_t
    fpsetround(fp_rnd_t _m)
    {
            fp_rnd_t _p;
            unsigned short _cw, _newcw;
    
            __fnstcw(&_cw);
            _p = (fp_rnd_t)((_cw & FP_RND_FLD) >> FP_RND_OFF);
            _newcw = _cw & ~FP_RND_FLD;
            _newcw |= (_m << FP_RND_OFF) & FP_RND_FLD;
            __fnldcw(_cw, _newcw);
            return (_p);
    }
    
    static __inline fp_prec_t
    fpgetprec(void)
    {
            unsigned short _cw;
    
            __fnstcw(&_cw);
            return ((fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF));
    }
    
    static __inline fp_prec_t
    fpsetprec(fp_prec_t _m)
    {
            fp_prec_t _p;
            unsigned short _cw, _newcw;
    
            __fnstcw(&_cw);
            _p = (fp_prec_t)((_cw & FP_PRC_FLD) >> FP_PRC_OFF);
            _newcw = _cw & ~FP_PRC_FLD;
            _newcw |= (_m << FP_PRC_OFF) & FP_PRC_FLD;
            __fnldcw(_cw, _newcw);
            return (_p);
    }
    
    /*
     * Get or set the exception mask.
     * Note that the x87 mask bits are inverted by the API -- a mask bit of 1
     * means disable for x87 and SSE, but for fp*mask() it means enable.
     */
    
    static __inline fp_except_t
   fpgetmask(void)
   {
           unsigned short _cw;
   
           __fnstcw(&_cw);
           return ((~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF);
   }
   
   static __inline fp_except_t
   fpsetmask(fp_except_t _m)
   {
           fp_except_t _p;
           unsigned short _cw, _newcw;
   
           __fnstcw(&_cw);
           _p = (~_cw & FP_MSKS_FLD) >> FP_MSKS_OFF;
           _newcw = _cw & ~FP_MSKS_FLD;
           _newcw |= (~_m << FP_MSKS_OFF) & FP_MSKS_FLD;
           __fnldcw(_cw, _newcw);
           return (_p);
   }
   
   static __inline fp_except_t
   fpgetsticky(void)
   {
           unsigned _ex;
           unsigned short _sw;
   
           __fnstsw(&_sw);
           _ex = (_sw & FP_STKY_FLD) >> FP_STKY_OFF;
           return ((fp_except_t)_ex);
   }
   
   static __inline fp_except_t
   fpresetsticky(fp_except_t _m)
   {
           struct {
                   unsigned _cw;
                   unsigned _sw;
                   unsigned _other[5];
           } _env;
           fp_except_t _p;
   
           _m &= FP_STKY_FLD >> FP_STKY_OFF;
           _p = fpgetsticky();
           if ((_p & ~_m) == _p)
                   return (_p);
           if ((_p & ~_m) == 0) {
                   __fnclex();
                   return (_p);
           }
           __fnstenv(&_env);
           _env._sw &= ~_m;
           __fldenv(&_env);
           return (_p);
   }
   
   #endif /* !_MACHINE_IEEEFP_H_ */

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