-/* IEEE754 fp format.
- Copyright (C) 1995, 1996 Christian von Roques */
-
-/* $Id$ */
-
-/* This file was derived from the GNU C Library's ieee754.h which
- carried the following copyright notice:
-
-Copyright (C) 1992 Free Software Foundation, Inc.
-
-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., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
-
-/* @@@ This is completely non-portable! ISO/IEC DIS 9899, section
- 3.5.2.1: An implementation may allocate any addressable storage
- unit large enough to hold a bit-field. If enough space remains, a
- bit-field that immediately follows another bit-field in a structure
- shall be packed into adjacent bits of the same unit. If
- insufficient space remains, whether a bit-field that does not fit
- is put into the next unit or overlaps adjacent units is
- implementation-defined. The order of allocation of bit-fields
- within a unit (high-order to low-order or low-order to high-order)
- is implementation-defined. */
-
-/* Floating point definitions in ieee standard number 754
- only used in target values (/libfirm/ir/tv/tv.c). */
+/* Copyright (C) 1992, 1995, 1996, 1999 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 Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; 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
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#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
+ {
+#if __BYTE_ORDER == __BIG_ENDIAN
+ unsigned int negative:1;
+ unsigned int exponent:8;
+ unsigned int mantissa:23;
+#endif /* Big endian. */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ unsigned int mantissa:23;
+ unsigned int exponent:8;
+ unsigned int negative:1;
+#endif /* Little endian. */
+ } ieee;
+
+ /* This format makes it easier to see if a NaN is a signalling NaN. */
+ struct
+ {
+#if __BYTE_ORDER == __BIG_ENDIAN
+ unsigned int negative:1;
+ unsigned int exponent:8;
+ unsigned int quiet_nan:1;
+ unsigned int mantissa:22;
+#endif /* Big endian. */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+ unsigned int mantissa:22;
+ unsigned int quiet_nan:1;
+ unsigned int exponent:8;
+ unsigned int negative:1;
+#endif /* Little endian. */
+ } ieee_nan;
+ };
+
+#define IEEE754_FLOAT_BIAS 0x7f /* Added to exponent. */
union ieee754_double
/* This is the IEEE 754 double-precision format. */
struct
{
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
unsigned int negative:1;
unsigned int exponent:11;
+ /* Together these comprise the mantissa. */
unsigned int mantissa0:20;
unsigned int mantissa1:32;
-#else
+#endif /* Big endian. */
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
+ unsigned int mantissa0:20;
+ unsigned int exponent:11;
+ unsigned int negative:1;
+ unsigned int mantissa1:32;
+# else
+ /* Together these comprise the mantissa. */
unsigned int mantissa1:32;
unsigned int mantissa0:20;
unsigned int exponent:11;
unsigned int negative:1;
-#endif
+# endif
+#endif /* Little endian. */
} ieee;
+
+ /* This format makes it easier to see if a NaN is a signalling NaN. */
struct
{
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
unsigned int negative:1;
unsigned int exponent:11;
unsigned int quiet_nan:1;
+ /* Together these comprise the mantissa. */
unsigned int mantissa0:19;
unsigned int mantissa1:32;
#else
+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
+ unsigned int mantissa0:19;
+ unsigned int quiet_nan:1;
+ unsigned int exponent:11;
+ unsigned int negative:1;
+ unsigned int mantissa1:32;
+# else
+ /* Together these comprise the mantissa. */
unsigned int mantissa1:32;
unsigned int mantissa0:19;
unsigned int quiet_nan:1;
unsigned int exponent:11;
unsigned int negative:1;
+# endif
#endif
} ieee_nan;
};
-/* bias added to exponent of ieee754_double */
-#define _IEEE754_DOUBLE_BIAS 0x3ff
+#define IEEE754_DOUBLE_BIAS 0x3ff /* Added to exponent. */
-union ieee754_float
+union ieee854_long_double
{
- float f;
+ long double d;
- /* This is the ieee754 single-precision format. */
+ /* This is the IEEE 854 double-extended-precision format. */
struct
{
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
unsigned int negative:1;
- unsigned int exponent:8;
- unsigned int mantissa:23;
-#else
- unsigned int mantissa:23;
- unsigned int exponent:8;
+ unsigned int exponent:15;
+ unsigned int empty:16;
+ unsigned int mantissa0:32;
+ unsigned int mantissa1:32;
+#endif
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
+ unsigned int exponent:15;
+ unsigned int negative:1;
+ unsigned int empty:16;
+ unsigned int mantissa0:32;
+ unsigned int mantissa1:32;
+# else
+ unsigned int mantissa1:32;
+ unsigned int mantissa0:32;
+ unsigned int exponent:15;
unsigned int negative:1;
+ unsigned int empty:16;
+# endif
#endif
} ieee;
- /* This is for extracting information about NaNs. */
+
+ /* This is for NaNs in the IEEE 854 double-extended-precision format. */
struct
{
-#ifdef WORDS_BIGENDIAN
+#if __BYTE_ORDER == __BIG_ENDIAN
unsigned int negative:1;
- unsigned int exponent:8;
+ unsigned int exponent:15;
+ unsigned int empty:16;
+ unsigned int one:1;
unsigned int quiet_nan:1;
- unsigned int mantissa:22;
-#else
- unsigned int mantissa:22;
+ unsigned int mantissa0:30;
+ unsigned int mantissa1:32;
+#endif
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+# if __FLOAT_WORD_ORDER == BIG_ENDIAN
+ unsigned int exponent:15;
+ unsigned int negative:1;
+ unsigned int empty:16;
+ unsigned int mantissa0:30;
unsigned int quiet_nan:1;
- unsigned int exponent:8;
+ unsigned int one:1;
+ unsigned int mantissa1:32;
+# else
+ unsigned int mantissa1:32;
+ unsigned int mantissa0:30;
+ unsigned int quiet_nan:1;
+ unsigned int one:1;
+ unsigned int exponent:15;
unsigned int negative:1;
+ unsigned int empty:16;
+# endif
#endif
} ieee_nan;
};
-/* bias added to exponent of ieee_float */
-#define _IEEE754_FLOAT_BIAS 0x7f
+#define IEEE854_LONG_DOUBLE_BIAS 0x3fff
+
+__END_DECLS
-#endif /* _IEEE754_H */
+#endif /* ieee754.h */
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