summaryrefslogtreecommitdiff
path: root/sysdeps/arm/fpu/ieee754.h
diff options
context:
space:
mode:
Diffstat (limited to 'sysdeps/arm/fpu/ieee754.h')
-rw-r--r--sysdeps/arm/fpu/ieee754.h115
1 files changed, 115 insertions, 0 deletions
diff --git a/sysdeps/arm/fpu/ieee754.h b/sysdeps/arm/fpu/ieee754.h
new file mode 100644
index 0000000000..73f7d6a376
--- /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 <features.h>
+
+#include <endian.h>
+
+__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 */