--- /dev/null
+/* Raise given exceptions.
+ Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by David Huggins-Daines <dhd@debian.org>
+
+ 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. */
+
+#include <fenv.h>
+#include <math.h>
+
+int
+feraiseexcept (int excepts)
+{
+ /* Raise exceptions represented by EXCEPTS. But we must raise only one
+ signal at a time. It is important that if the overflow/underflow
+ exception and the divide by zero exception are given at the same
+ time, the overflow/underflow exception follows the divide by zero
+ exception. */
+
+ /* We do these bits in assembly to be certain GCC doesn't optimize
+ away something important, and so we can force delayed traps to
+ occur. */
+
+ /* FIXME: These all need verification! */
+
+ /* First: invalid exception. */
+ if (excepts & FE_INVALID)
+ {
+ /* One example of a invalid operation is 0 * Infinity. */
+ double d = HUGE_VAL;
+ __asm__ __volatile__ ("fmpy,dbl %1,%%fr0,%0\n\t"
+ /* FIXME: is this a proper trap barrier? */
+ "fcpy,dbl %%fr0,%%fr0" : "=f" (d) : "0" (d));
+ }
+
+ /* Next: division by zero. */
+ if (excepts & FE_DIVBYZERO)
+ {
+ double d = 1.0;
+ __asm__ __volatile__ ("fdiv,dbl %1,%%fr0,%0\n\t"
+ "fcpy,dbl %%fr0,%%fr0" : "=f" (d) : "0" (d));
+ }
+
+ /* Next: overflow. */
+ /* FIXME: Compare with IA-64 - do we have the same problem? */
+ if (excepts & FE_OVERFLOW)
+ {
+ double d = DBL_MAX;
+
+ __asm__ __volatile__ ("fmpy,dbl %1,%1,%0\n\t"
+ "fcpy,dbl %%fr0,%%fr0" : "=f" (d) : "0" (d));
+ }
+
+ /* Next: underflow. */
+ if (excepts & FE_UNDERFLOW)
+ {
+ double d = DBL_MIN;
+ double e = 69.69;
+
+ __asm__ __volatile__ ("fdiv,dbl %1,%2,%0\n\t"
+ "fcpy,dbl %%fr0,%%fr0" : "=f" (d) : "0" (d), "f" (e));
+ }
+
+ /* Last: inexact. */
+ if (excepts & FE_INEXACT)
+ {
+ double d = 1.0;
+ double e = M_PI;
+
+ __asm__ __volatile__ ("fdiv,dbl %1,%2,%0\n\t"
+ "fcpy,dbl %%fr0,%%fr0" : "=f" (d) : "0" (d), "f" (e));
+ }
+
+ /* Success. */
+ return 0;
+}