From 62b52adc0e56651e618604bc8381b9fd400009a8 Mon Sep 17 00:00:00 2001 From: mark Date: Sun, 12 May 1996 21:26:20 +0000 Subject: [PATCH] Definitions of various contants and types for arm32 IEEE float point. --- sys/arch/arm32/include/ieee.h | 150 ++++++++++++++++++++++++++++++++ sys/arch/arm32/include/ieeefp.h | 25 ++++++ 2 files changed, 175 insertions(+) create mode 100644 sys/arch/arm32/include/ieee.h create mode 100644 sys/arch/arm32/include/ieeefp.h diff --git a/sys/arch/arm32/include/ieee.h b/sys/arch/arm32/include/ieee.h new file mode 100644 index 000000000000..1de6d3449b3a --- /dev/null +++ b/sys/arch/arm32/include/ieee.h @@ -0,0 +1,150 @@ +/* $NetBSD: ieee.h,v 1.1 1996/05/12 21:26:20 mark Exp $ */ + +/* + * Copyright (c) 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This software was developed by the Computer Systems Engineering group + * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and + * contributed to Berkeley. + * + * 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, Lawrence Berkeley Laboratory. + * + * 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. + * + * @(#)ieee.h 8.1 (Berkeley) 6/11/93 + */ + +/* + * ieee.h defines the machine-dependent layout of the machine's IEEE + * floating point. + */ + +/* + * Define the number of bits in each fraction and exponent. + * + * k k+1 + * Note that 1.0 x 2 == 0.1 x 2 and that denorms are represented + * + * (-exp_bias+1) + * as fractions that look like 0.fffff x 2 . This means that + * + * -126 + * the number 0.10000 x 2 , for instance, is the same as the normalized + * + * -127 -128 + * float 1.0 x 2 . Thus, to represent 2 , we need one leading zero + * + * -129 + * in the fraction; to represent 2 , we need two, and so on. This + * + * (-exp_bias-fracbits+1) + * implies that the smallest denormalized number is 2 + * + * for whichever format we are talking about: for single precision, for + * + * -126 -149 + * instance, we get .00000000000000000000001 x 2 , or 1.0 x 2 , and + * + * -149 == -127 - 23 + 1. + */ +#define SNG_EXPBITS 8 +#define SNG_FRACBITS 23 + +#define DBL_EXPBITS 11 +#define DBL_FRACBITS 52 + +#define E80_EXPBITS 15 +#define E80_FRACBITS 64 + +#define EXT_EXPBITS 15 +#define EXT_FRACBITS 112 + +struct ieee_single { + u_int sng_frac:23; + u_int sng_exponent:8; + u_int sng_sign:1; +}; + +struct ieee_double { + u_int dbl_frach:20; + u_int dbl_exp:11; + u_int dbl_sign:1; + u_int dbl_fracl; +}; + +struct ieee_e80 { + u_int e80_exp:15; + u_int e80_zero:16; + u_int e80_sign:1; + u_int e80_frach:31; + u_int e80_j:1; + u_int e80_fracl; +}; + +struct ieee_ext { + u_int ext_frach:16; + u_int ext_exp:15; + u_int ext_sign:1; + u_int ext_frachm; + u_int ext_fraclm; + u_int ext_fracl; +}; + +/* + * Floats whose exponent is in [1..INFNAN) (of whatever type) are + * `normal'. Floats whose exponent is INFNAN are either Inf or NaN. + * Floats whose exponent is zero are either zero (iff all fraction + * bits are zero) or subnormal values. + * + * A NaN is a `signalling NaN' if its QUIETNAN bit is clear in its + * high fraction; if the bit is set, it is a `quiet NaN'. + */ +#define SNG_EXP_INFNAN 255 +#define DBL_EXP_INFNAN 2047 +#define E80_EXP_INFNAN 32767 +#define EXT_EXP_INFNAN 32767 + +#if 0 +#define SNG_QUIETNAN (1 << 22) +#define DBL_QUIETNAN (1 << 19) +#define E80_QUIETNAN (1 << 15) +#define EXT_QUIETNAN (1 << 15) +#endif + +/* + * Exponent biases. + */ +#define SNG_EXP_BIAS 127 +#define DBL_EXP_BIAS 1023 +#define E80_EXP_BIAS 16383 +#define EXT_EXP_BIAS 16383 diff --git a/sys/arch/arm32/include/ieeefp.h b/sys/arch/arm32/include/ieeefp.h new file mode 100644 index 000000000000..9e89a8850143 --- /dev/null +++ b/sys/arch/arm32/include/ieeefp.h @@ -0,0 +1,25 @@ +/* $NetBSD: ieeefp.h,v 1.1 1996/05/12 21:26:24 mark Exp $ */ + +/* + * Written by J.T. Conklin, Apr 28, 1995 + * Public domain. + */ + +#ifndef _ARM32_IEEEFP_H_ +#define _ARM32_IEEEFP_H_ + +typedef int fp_except; +#define FP_X_INV 0x01 /* invalid operation exception */ +#define FP_X_DZ 0x02 /* divide-by-zero exception */ +#define FP_X_OFL 0x04 /* overflow exception */ +#define FP_X_UFL 0x08 /* underflow exception */ +#define FP_X_IMP 0x10 /* imprecise (loss of precision; "inexact") */ + +typedef enum { + FP_RN=0, /* round to nearest representable number */ + FP_RP=1, /* round toward positive infinity */ + FP_RM=2, /* round toward negative infinity */ + FP_RZ=3 /* round to zero (truncate) */ +} fp_rnd; + +#endif /* _ARM32_IEEEFP_H_ */