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Annotation of nono/fpe/fpu_getexp.c, revision 1.1.1.1

1.1       root        1: /*     $NetBSD: fpu_getexp.c,v 1.5 2011/07/18 07:44:30 isaki Exp $     */
                      2: 
                      3: /*
                      4:  * Copyright (c) 1995  Ken Nakata
                      5:  *     All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. Neither the name of the author nor the names of its contributors
                     16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  *
                     31:  *     @(#)fpu_getexp.c        10/8/95
                     32:  */
                     33: 
                     34: #include "fpu_emulate.h"
                     35: 
                     36: struct fpn *
                     37: fpu_getexp(struct fpemu *fe)
                     38: {
                     39:        struct fpn *fp = &fe->fe_f2;
                     40: 
                     41:        fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
                     42: 
                     43:        if (fp->fp_class == FPC_INF) {
                     44:                fp = fpu_newnan(fe);
                     45:                fe->fe_fpsr |= FPSR_OPERR;
                     46:        } else if (fp->fp_class == FPC_NUM) { /* a number */
                     47:                fpu_explode(fe, &fe->fe_f3, FTYPE_LNG, &fp->fp_exp);
                     48:                fp = &fe->fe_f3;
                     49:        } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
                     50:                fe->fe_fpsr |= FPSR_SNAN;
                     51:        } /* else if fp == zero or fp == quiet NaN, return itself */
                     52:        return fp;
                     53: }
                     54: 
                     55: struct fpn *
                     56: fpu_getman(struct fpemu *fe)
                     57: {
                     58:        struct fpn *fp = &fe->fe_f2;
                     59: 
                     60:        fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
                     61: 
                     62:        if (fp->fp_class == FPC_INF) {
                     63:                fp = fpu_newnan(fe);
                     64:                fe->fe_fpsr |= FPSR_OPERR;
                     65:        } else if (fp->fp_class == FPC_NUM) { /* a number */
                     66:                fp->fp_exp = 0;
                     67:        } else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
                     68:                fe->fe_fpsr |= FPSR_SNAN;
                     69:        } /* else if fp == zero or fp == quiet NaN, return itself */
                     70:        return fp;
                     71: }

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