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/* $OpenBSD: fpu_getexp.c,v 1.3 2006/06/11 20:43:28 miod Exp $ */
/* $NetBSD: fpu_getexp.c,v 1.1 1995/11/03 04:47:11 briggs Exp $ */
/*
* Copyright (c) 1995 Ken Nakata
* 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. Neither the name of the author 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 AUTHOR 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 AUTHOR 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.
*
* @(#)fpu_getexp.c 10/8/95
*/
#include <sys/types.h>
#include <m68k/fpe/fpu_emulate.h>
struct fpn *
fpu_getexp(fe)
struct fpemu *fe;
{
struct fpn *fp = &fe->fe_f2;
fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
if (fp->fp_class == FPC_INF) {
fp = fpu_newnan(fe);
fe->fe_fpsr |= FPSR_OPERR;
} else if (fp->fp_class == FPC_NUM) { /* a number */
fpu_explode(fe, &fe->fe_f3, FTYPE_LNG, &fp->fp_exp);
fp = &fe->fe_f3;
} else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
fe->fe_fpsr |= FPSR_SNAN;
} /* else if fp == zero or fp == quiet NaN, return itself */
return fp;
}
struct fpn *
fpu_getman(fe)
struct fpemu *fe;
{
struct fpn *fp = &fe->fe_f2;
fe->fe_fpsr &= ~FPSR_EXCP; /* clear all exceptions */
if (fp->fp_class == FPC_INF) {
fp = fpu_newnan(fe);
fe->fe_fpsr |= FPSR_OPERR;
} else if (fp->fp_class == FPC_NUM) { /* a number */
fp->fp_exp = 0;
} else if (fp->fp_class == FPC_SNAN) { /* signaling NaN */
fe->fe_fpsr |= FPSR_SNAN;
} /* else if fp == zero or fp == quiet NaN, return itself */
return fp;
}
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