77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
/* $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 "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;
|
|
}
|
|
|