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-rw-r--r--sysdeps/vax/infnan.c62
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+/* Copyright (C) 1991, 1992, 1995 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., 675 Mass Ave,
+Cambridge, MA 02139, USA. */
+
+#ifndef __GNUC__
+ #error This file uses GNU C extensions; you must compile with GCC.
+#else
+
+#include <ansidecl.h>
+#include <errno.h>
+#include <math.h>
+
+/* Deal with an infinite or NaN result.
+ If ERROR is ERANGE, result is +Inf;
+ if ERROR is - ERANGE, result is -Inf;
+ otherwise result is NaN.
+ This will set `errno' to either ERANGE or EDOM,
+ and may return an infinity or NaN, or may do something else. */
+double
+DEFUN(__infnan, (error), int error)
+{
+ switch (error)
+ {
+ case ERANGE:
+ errno = ERANGE;
+ break;
+
+ case - ERANGE:
+ errno = ERANGE;
+ break;
+
+ default:
+ errno = EDOM;
+ break;
+ }
+
+ /* Trigger a reserved operand fault. */
+ {
+ double result;
+ asm volatile("emodd %1, %1, %2, %0, %0" : "=r" (result) :
+ "i" (0), "i" (0x8000));
+ return result;
+ }
+}
+
+#endif
+
+weak_alias (__infnan, infnan)