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:
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