huge_vall.h: add for i386,ia64,m68k,sparc

relevant only for gcc < 3.3 or non-gcc compiler

Signed-off-by: Peter S. Mazinger <ps.m@gmx.net>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

1 files changed, 43 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/i386/bits/huge_vall.h b/libc/sysdeps/linux/i386/bits/huge_vall.h
new file mode 100644
index 000000000..0678c7cd3
--- /dev/null
+++ b/libc/sysdeps/linux/i386/bits/huge_vall.h
@@ -0,0 +1,43 @@
+/* `HUGE_VALL' constant for ix86 (where it is infinity).
+   Used by <stdlib.h> and <math.h> functions for overflow.
+   Copyright (C) 1992, 1995, 1996, 1997, 1999, 2000, 2004
+   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_vall.h> directly; include <math.h> instead."
+#endif
+
+#if __GNUC_PREREQ(3,3)
+# define HUGE_VALL	(__builtin_huge_vall())
+#elif __GNUC_PREREQ(2,96)
+# define HUGE_VALL	(__extension__ 0x1.0p32767L)
+#else
+
+# define __HUGE_VALL_bytes	{ 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 }
+
+# define __huge_vall_t	union { unsigned char __c[12]; long double __ld; }
+# ifdef __GNUC__
+#  define HUGE_VALL	(__extension__ \
+			 ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld)
+# else	/* Not GCC.  */
+static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes };
+#  define HUGE_VALL	(__huge_vall.__ld)
+#  endif /* GCC.  */
+
+#endif /* GCC 2.95 */