Imported gcc-4.4.3

[msp430-gcc.git] / libdecnumber / decRound.c

diff --git a/libdecnumber/decRound.c b/libdecnumber/decRound.c
new file mode 100644 (file)
index 0000000..811bea8
--- /dev/null
+++ b/libdecnumber/decRound.c
@@ -0,0 +1,97 @@
+/* Internal testing support for rounding for decimal float.
+
+   Copyright (C) 2005, 2006, 2009 Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC 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 General Public
+   License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "dconfig.h"
+#include "decContext.h"
+#include "decRound.h"
+
+/* Internal, non-documented functions for testing libgcc functions.
+   This support is not sufficient for application use.  */
+
+#define FE_DEC_DOWNWARD 0
+#define FE_DEC_TONEAREST 1
+#define FE_DEC_TONEARESTFROMZERO 2
+#define FE_DEC_TOWARDZERO 3
+#define FE_DEC_UPWARD 4
+#define FE_DEC_MAX 5
+
+static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN;
+
+/* Set the decNumber rounding mode from the FE_DEC_* value in MODE.  */ 
+
+void
+__dfp_set_round (int mode)
+{
+  switch (mode)
+    {
+    case FE_DEC_DOWNWARD:
+      __dfp_rounding_mode = DEC_ROUND_FLOOR; break;
+    case FE_DEC_TONEAREST:
+      __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
+    case FE_DEC_TONEARESTFROMZERO:
+      __dfp_rounding_mode = DEC_ROUND_HALF_UP; break;
+    case FE_DEC_TOWARDZERO:
+      __dfp_rounding_mode = DEC_ROUND_DOWN; break;
+    case FE_DEC_UPWARD:
+      __dfp_rounding_mode = DEC_ROUND_CEILING; break;
+    default:
+     /* We can't use assert in libgcc, so just return the default mode.  */
+      __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
+    }
+}
+
+/* Return the decNumber rounding mode as an FE_DEC_* value.  */
+
+int
+__dfp_get_round (void)
+{
+  int mode;
+
+  switch (__dfp_rounding_mode)
+    {
+    case DEC_ROUND_FLOOR:
+      mode = FE_DEC_DOWNWARD; break;
+    case DEC_ROUND_HALF_EVEN:
+      mode = FE_DEC_TONEAREST; break;
+    case DEC_ROUND_HALF_UP:
+      mode = FE_DEC_TONEARESTFROMZERO; break;
+    case DEC_ROUND_DOWN:
+      mode = FE_DEC_TOWARDZERO; break;
+    case DEC_ROUND_CEILING:
+      mode = FE_DEC_UPWARD; break;
+    default:
+      /* We shouldn't get here, but can't use assert in libgcc.  */
+      mode = -1;
+    }
+  return mode;
+}
+
+/* Return the decNumber version of the current rounding mode.  */
+
+enum rounding
+__decGetRound (void)
+{
+  return __dfp_rounding_mode;
+}