From 43ce7f2e75ba31af1167a6d1faf58588d9bb25ea Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Mon, 1 Jun 1998 14:24:49 +0000 Subject: [PATCH] IEEE 754 float support for strange ARMs. --- sysdeps/arm/fpu/ieee754.h | 115 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 115 insertions(+) create mode 100644 sysdeps/arm/fpu/ieee754.h diff --git a/sysdeps/arm/fpu/ieee754.h b/sysdeps/arm/fpu/ieee754.h new file mode 100644 index 0000000..73f7d6a --- /dev/null +++ b/sysdeps/arm/fpu/ieee754.h @@ -0,0 +1,115 @@ +/* Copyright (C) 1992, 1995, 1996, 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#ifndef _IEEE754_H + +#define _IEEE754_H 1 +#include + +#include + +__BEGIN_DECLS + +union ieee754_float + { + float f; + + /* This is the IEEE 754 single-precision format. */ + struct + { + unsigned int mantissa:23; + unsigned int exponent:8; + unsigned int negative:1; + } ieee; + + /* This format makes it easier to see if a NaN is a signalling NaN. */ + struct + { + unsigned int mantissa:22; + unsigned int quiet_nan:1; + unsigned int exponent:8; + unsigned int negative:1; + } ieee_nan; + }; + +#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */ + + +union ieee754_double + { + double d; + + /* This is the IEEE 754 double-precision format. */ + struct + { + unsigned int mantissa0:20; + unsigned int exponent:11; + unsigned int negative:1; + unsigned int mantissa1:32; + } ieee; + + /* This format makes it easier to see if a NaN is a signalling NaN. */ + struct + { + unsigned int mantissa0:19; + unsigned int quiet_nan:1; + unsigned int exponent:11; + unsigned int negative:1; + unsigned int mantissa1:32; + } ieee_nan; + }; + +#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */ + + +/* The following two structures are correct for `new' floating point systems but + wrong for the old FPPC. The only solution seems to be to avoid their use on + old hardware. */ + +union ieee854_long_double + { + long double d; + + /* This is the IEEE 854 double-extended-precision format. */ + struct + { + unsigned int exponent:15; + unsigned int empty:16; + unsigned int negative:1; + unsigned int mantissa1:32; + unsigned int mantissa0:32; + } ieee; + + /* This is for NaNs in the IEEE 854 double-extended-precision format. */ + struct + { + unsigned int exponent:15; + unsigned int empty:16; + unsigned int negative:1; + unsigned int mantissa1:32; + unsigned int mantissa0:30; + unsigned int quiet_nan:1; + unsigned int one:1; + } ieee_nan; + }; + +#define IEEE854_LONG_DOUBLE_BIAS 0x3fff + +__END_DECLS + +#endif /* ieee754.h */ -- 2.7.4