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Annotation of nono/fpe/fpu_getexp.c, revision 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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