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