From 9cee42f10dbc5b33866ff137b926a74abd7c1a5b Mon Sep 17 00:00:00 2001
From: Eric Andersen <andersen@codepoet.org>
Date: Fri, 1 Mar 2002 20:46:26 +0000
Subject: Major rework of the include files to eliminate redundancy and to
 better support each arch.  This is a really big patch...  -Erik

---
 libc/sysdeps/linux/common/bits/huge_val.h | 103 ++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 libc/sysdeps/linux/common/bits/huge_val.h

(limited to 'libc/sysdeps/linux/common/bits/huge_val.h')

diff --git a/libc/sysdeps/linux/common/bits/huge_val.h b/libc/sysdeps/linux/common/bits/huge_val.h
new file mode 100644
index 000000000..b33974364
--- /dev/null
+++ b/libc/sysdeps/linux/common/bits/huge_val.h
@@ -0,0 +1,103 @@
+/* `HUGE_VAL' constants for IEEE 754 machines (where it is infinity).
+   Used by <stdlib.h> and <math.h> functions for overflow.
+   Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000 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 _MATH_H
+# error "Never use <bits/huge_val.h> directly; include <math.h> instead."
+#endif
+
+#include <features.h>
+
+/* IEEE positive infinity (-HUGE_VAL is negative infinity).  */
+
+#ifdef	__GNUC__
+
+# if __GNUC_PREREQ(2,96)
+
+#  define HUGE_VAL (__extension__ 0x1.0p2047)
+
+# else
+
+#  define HUGE_VAL \
+  (__extension__							      \
+   ((union { unsigned __l __attribute__((__mode__(__DI__))); double __d; })   \
+    { __l: 0x7ff0000000000000ULL }).__d)
+
+# endif
+
+#else /* not GCC */
+
+# include <endian.h>
+
+typedef union { unsigned char __c[8]; double __d; } __huge_val_t;
+
+# if __BYTE_ORDER == __BIG_ENDIAN
+#  define __HUGE_VAL_bytes	{ 0x7f, 0xf0, 0, 0, 0, 0, 0, 0 }
+# endif
+# if __BYTE_ORDER == __LITTLE_ENDIAN
+#  define __HUGE_VAL_bytes	{ 0, 0, 0, 0, 0, 0, 0xf0, 0x7f }
+# endif
+
+static __huge_val_t __huge_val = { __HUGE_VAL_bytes };
+# define HUGE_VAL	(__huge_val.__d)
+
+#endif	/* GCC.  */
+
+
+/* ISO C99 extensions: (float) HUGE_VALF and (long double) HUGE_VALL.  */
+
+#ifdef __USE_ISOC99
+
+# ifdef __GNUC__
+
+#  if __GNUC_PREREQ(2,96)
+
+#   define HUGE_VALF (__extension__ 0x1.0p255f)
+
+#  else
+
+#   define HUGE_VALF \
+  (__extension__							      \
+   ((union { unsigned __l __attribute__((__mode__(__SI__))); float __d; })    \
+    { __l: 0x7f800000UL }).__d)
+
+#  endif
+
+# else /* not GCC */
+
+typedef union { unsigned char __c[4]; float __f; } __huge_valf_t;
+
+#  if __BYTE_ORDER == __BIG_ENDIAN
+#   define __HUGE_VALF_bytes	{ 0x7f, 0x80, 0, 0 }
+#  endif
+#  if __BYTE_ORDER == __LITTLE_ENDIAN
+#   define __HUGE_VALF_bytes	{ 0, 0, 0x80, 0x7f }
+#  endif
+
+static __huge_valf_t __huge_valf = { __HUGE_VALF_bytes };
+#  define HUGE_VALF	(__huge_valf.__f)
+
+# endif	/* GCC.  */
+
+
+/* Generally there is no separate `long double' format and it is the
+   same as `double'.  */
+# define HUGE_VALL HUGE_VAL
+
+#endif /* __USE_ISOC99.  */
-- 
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