1 files changed, 92 insertions, 0 deletions
diff --git a/libm/metag/fraiseexcpt.c b/libm/metag/fraiseexcpt.c
new file mode 100644
index 000000000..9ab39bbf6
--- /dev/null
+++ b/libm/metag/fraiseexcpt.c
@@ -0,0 +1,92 @@
+/* Raise given exceptions.
+   Copyright (C) 2013 Imagination Technologies Ltd.
+   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.  */
+
+#include <fenv.h>
+#include <math.h>
+
+libm_hidden_proto(feraiseexcept)
+
+int
+feraiseexcept (int excepts)
+{
+  /* Raise exceptions represented by EXPECTS.  But we must raise only
+     one signal at a time.  It is important that if the overflow/underflow
+     exception and the inexact exception are given at the same time,
+     the overflow/underflow exception follows the inexact exception.  */
+
+  /* First: invalid exception.  */
+  if ((FE_INVALID & excepts) != 0)
+    {
+      /* Reciprocal square root of a negative number is invalid. */
+      __asm__ volatile(
+		   "F MOV FX.0,#0xc000 ! -2\n"
+		   "F RSQ FX.1,FX.0\n"
+		   );
+    }
+
+  /* Next: division by zero.  */
+  if ((FE_DIVBYZERO & excepts) != 0)
+    {
+      __asm__ volatile(
+		   "F MOV FX.0,#0\n"
+		   "F RCP FX.1,FX.0\n"
+		   );
+    }
+
+  /* Next: overflow.  */
+  if ((FE_OVERFLOW & excepts) != 0)
+    {
+      /* Adding a large number in single precision can cause overflow. */
+      __asm__ volatile(
+		   "  MOVT D0.0,#0x7f7f\n"
+		   "  ADD  D0.0,D0.0,#0xffff\n"
+		   "F MOV  FX.0,D0.0\n"
+		   "F ADD  FX.1,FX.0,FX.0\n"
+		   );
+    }
+
+  /* Next: underflow.  */
+  if ((FE_UNDERFLOW & excepts) != 0)
+    {
+      /* Multiplying a small value by 0.5 will cause an underflow. */
+      __asm__ volatile(
+		   "  MOV  D0.0,#1\n"
+		   "F MOV  FX.0,D0.0\n"
+		   "  MOVT D0.0,#0x3f00\n"
+		   "F MOV  FX.1,D0.0\n"
+		   "F MUL  FX.2,FX.1,FX.0\n"
+		   );
+    }
+
+  /* Last: inexact.  */
+  if ((FE_INEXACT & excepts) != 0)
+    {
+      /* Converting a small single precision value to half precision
+	 can cause an inexact exception. */
+      __asm__ volatile(
+		   "  MOV  D0.0,#0x0001\n"
+		   "F MOV  FX.0,D0.0\n"
+		   "F FTOH FX.1,FX.0\n"
+		   );
+    }
+
+  /* Success.  */
+  return 0;
+}
+libm_hidden_def(feraiseexcept)