sys/sys/ieeefp.h

/*-
 * Copyright (c) 1990 Andrew Moore, Talke Studio
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *      from: @(#) ieeefp.h     1.0 (Berkeley) 9/23/93
 *      $Id$
 */

/*
 *      IEEE floating point type and constant definitions.
 */

#ifndef _IEEEFP_H_
#define _IEEEFP_H_

#ifdef __i386__

/*
 * FP rounding modes
 */
typedef enum {
        FP_RN=0,        /* round to nearest */
        FP_RM,          /* round down to minus infinity */
        FP_RP,          /* round up to plus infinity */
        FP_RZ           /* truncate */
} fp_rnd_t;

/*
 * FP precison modes
 */
typedef enum {
        FP_PS=0,        /* 24 bit (single-precsion) */
        FP_PRS,         /* reserved */
        FP_PD,          /* 53 bit (double-precision) */
        FP_PE           /* 64 bit (extended-precsion) */
} fp_prec_t;

#define fp_except_t     int

/*
 * FP exception masks
 */
#define FP_X_INV        0x01    /* invalid operation */
#define FP_X_DNML       0x02    /* denormal */
#define FP_X_DZ         0x04    /* zero divide */
#define FP_X_OFL        0x08    /* overflow */
#define FP_X_UFL        0x10    /* underflow */
#define FP_X_IMP        0x20    /* (im)precision */

/*
 * FP registers
 */
#define FP_MSKS_REG     0       /* exception masks */
#define FP_PRC_REG      0       /* precision */
#define FP_RND_REG      0       /* direction */
#define FP_STKY_REG     1       /* sticky flags */

/*
 * FP register bit field masks
 */
#define FP_MSKS_FLD     0x3f    /* exception masks field */
#define FP_PRC_FLD      0x300   /* precision control field */
#define FP_RND_FLD      0xc00   /* round control field */
#define FP_STKY_FLD     0x3f    /* sticky flags field */

/*
 * FP register bit field offsets
 */
#define FP_MSKS_OFF     0       /* exception masks offset */
#define FP_PRC_OFF      8       /* precision control offset */
#define FP_RND_OFF      10      /* round control offset */
#define FP_STKY_OFF     0       /* sticky flags offset */

#endif /* __i386__ */

#endif /* !_IEEEFP_H_ */