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Annotation of sys/arch/m68k/fpe/fpu_getexp.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: fpu_getexp.c,v 1.3 2006/06/11 20:43:28 miod Exp $     */
                      2: /*     $NetBSD: fpu_getexp.c,v 1.1 1995/11/03 04:47:11 briggs Exp $    */
                      3:
                      4: /*
                      5:  * Copyright (c) 1995  Ken Nakata
                      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. Neither the name of the author nor the names of its contributors
                     17:  *    may be used to endorse or promote products derived from this software
                     18:  *    without specific prior written permission.
                     19:  *
                     20:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     21:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     22:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     23:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     24:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     25:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     26:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     27:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     28:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     29:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     30:  * SUCH DAMAGE.
                     31:  *
                     32:  *     @(#)fpu_getexp.c        10/8/95
                     33:  */
                     34:
                     35: #include <sys/types.h>
                     36:
                     37: #include <m68k/fpe/fpu_emulate.h>
                     38:
                     39: struct fpn *
                     40: fpu_getexp(fe)
                     41:      struct fpemu *fe;
                     42: {
                     43:   struct fpn *fp = &fe->fe_f2;
                     44:
                     45:   fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
                     46:
                     47:   if (fp->fp_class == FPC_INF) {
                     48:     fp = fpu_newnan(fe);
                     49:     fe->fe_fpsr |= FPSR_OPERR;
                     50:   } else if (fp->fp_class == FPC_NUM) { /* a number */
                     51:     fpu_explode(fe, &fe->fe_f3, FTYPE_LNG, &fp->fp_exp);
                     52:     fp = &fe->fe_f3;
                     53:   } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
                     54:     fe->fe_fpsr |= FPSR_SNAN;
                     55:   } /* else if fp == zero or fp == quiet NaN, return itself */
                     56:   return fp;
                     57: }
                     58:
                     59: struct fpn *
                     60: fpu_getman(fe)
                     61:      struct fpemu *fe;
                     62: {
                     63:   struct fpn *fp = &fe->fe_f2;
                     64:
                     65:   fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
                     66:
                     67:   if (fp->fp_class == FPC_INF) {
                     68:     fp = fpu_newnan(fe);
                     69:     fe->fe_fpsr |= FPSR_OPERR;
                     70:   } else if (fp->fp_class == FPC_NUM) { /* a number */
                     71:     fp->fp_exp = 0;
                     72:   } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
                     73:     fe->fe_fpsr |= FPSR_SNAN;
                     74:   } /* else if fp == zero or fp == quiet NaN, return itself */
                     75:   return fp;
                     76: }
                     77: