[src/trunk]: src/sys/arch Add ieee.h.

[mycroft <mycroft%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/e3613b6bedd6
branches:  trunk
changeset: 475900:e3613b6bedd6
user:      mycroft <mycroft%NetBSD.org@localhost>
date:      Sun Aug 29 18:21:20 1999 +0000

description:
Add ieee.h.

diffstat:

 sys/arch/mips/include/ieee.h     |  135 +++++++++++++++++++++++++++++++++++++++
 sys/arch/newsmips/include/ieee.h |    1 +
 sys/arch/pica/include/ieee.h     |    1 +
 sys/arch/pmax/include/ieee.h     |    1 +
 4 files changed, 138 insertions(+), 0 deletions(-)

diffs (154 lines):

diff -r 3b74ca1f7017 -r e3613b6bedd6 sys/arch/mips/include/ieee.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/mips/include/ieee.h      Sun Aug 29 18:21:20 1999 +0000
@@ -0,0 +1,135 @@
+/*     $NetBSD: ieee.h,v 1.1 1999/08/29 18:21:20 mycroft 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.  It does *not* define (yet?) any of the rounding
+ * mode bits, exceptions, and so forth.
+ */
+#include <machine/endian.h>
+
+/*
+ * 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
+
+struct ieee_single {
+#if BYTE_ORDER == LITTLE_ENDIAN
+       u_int   sng_frac:23;
+       u_int   sng_exp:8;
+       u_int   sng_sign:1;
+#else
+       u_int   sng_sign:1;
+       u_int   sng_exp:8;
+       u_int   sng_frac:23;
+#endif
+};
+
+struct ieee_double {
+#if BYTE_ORDER == LITTLE_ENDIAN
+       u_int   dbl_fracl;
+       u_int   dbl_frach:20;
+       u_int   dbl_exp:11;
+       u_int   dbl_sign:1;
+#else
+       u_int   dbl_sign:1;
+       u_int   dbl_exp:11;
+       u_int   dbl_frach:20;
+       u_int   dbl_fracl;
+#endif
+};
+
+/*
+ * 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
+
+#if 0
+#define        SNG_QUIETNAN    (1 << 22)
+#define        DBL_QUIETNAN    (1 << 19)
+#endif
+
+/*
+ * Exponent biases.
+ */
+#define        SNG_EXP_BIAS    127
+#define        DBL_EXP_BIAS    1023
diff -r 3b74ca1f7017 -r e3613b6bedd6 sys/arch/newsmips/include/ieee.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/newsmips/include/ieee.h  Sun Aug 29 18:21:20 1999 +0000
@@ -0,0 +1,1 @@
+#include <mips/ieee.h>
diff -r 3b74ca1f7017 -r e3613b6bedd6 sys/arch/pica/include/ieee.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/pica/include/ieee.h      Sun Aug 29 18:21:20 1999 +0000
@@ -0,0 +1,1 @@
+#include <mips/ieee.h>
diff -r 3b74ca1f7017 -r e3613b6bedd6 sys/arch/pmax/include/ieee.h
--- /dev/null   Thu Jan 01 00:00:00 1970 +0000
+++ b/sys/arch/pmax/include/ieee.h      Sun Aug 29 18:21:20 1999 +0000
@@ -0,0 +1,1 @@
+#include <mips/ieee.h>