1 files changed, 72 insertions, 0 deletions
diff --git a/sysdeps/alpha/fpu/fraiseexcpt.c b/sysdeps/alpha/fpu/fraiseexcpt.c
new file mode 100644
index 0000000000..6a53e55e7d
--- /dev/null
+++ b/sysdeps/alpha/fpu/fraiseexcpt.c
@@ -0,0 +1,72 @@
+/* Raise given exceptions.
+   Copyright (C) 1997 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Richard Henderson <rth@tamu.edu>, 1997.
+
+   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>
+
+void
+feraiseexcept (int excepts)
+{
+  double tmp;
+
+  /* Raise exceptions represented by EXPECTS.  But we must raise only
+     one signal at a time.  It is important the if the overflow/underflow
+     exception and the inexact exception are given at the same time,
+     the overflow/underflow exception precedes the inexact exception.  */
+
+  /* We do these bits in assembly to be certain GCC doesn't optimize
+     away something important.  */
+
+  /* First: invalid exception.  */
+  if (FE_INVALID & excepts)
+    {
+      /* One example of a invalid operation is 0 * Infinity.  */
+      __asm__ __volatile__("mult/sui $f31,%1,%0; trapb"
+			   : "=f"(tmp) : "f"(HUGE_VAL));
+    }
+
+  /* Next: division by zero.  */
+  if (FE_DIVBYZERO & excepts)
+    {
+      __asm__ __volatile__("cmpteq $f31,$f31,%0; divt/sui %0,$f31,%0; trapb"
+			   : "=f"(tmp));
+    }
+
+  /* Next: overflow.  */
+  if (FE_OVERFLOW & excepts)
+    {
+      __asm__ __volatile__("mult/sui %1,%1,%0; trapb"
+			   : "=f"(tmp) : "f"(DBL_MAX));
+    }
+
+  /* Next: underflow.  */
+  if (FE_UNDERFLOW & excepts)
+    {
+      __asm__ __volatile__("divt/sui %1,%2,%0; trapb"
+			   : "=f"(tmp) : "f"(DBL_MIN), "f"(16.0));
+    }
+
+  /* Last: inexact.  */
+  if (FE_INEXACT & excepts)
+    {
+      __asm__ __volatile__("divt/sui %1,%2,%0; trapb"
+			   : "=f"(tmp) : "f"(1.0), "f"(M_PI));
+    }
+}