* libdecnumber: Import decNumber sources from the dfp-branch.

From-SVN: r107629

1 files changed, 92 insertions, 0 deletions

diff --git a/libdecnumber/decRound.c b/libdecnumber/decRound.c
new file mode 100644
index 00000000000..d3726665e13
--- /dev/null
+++ b/libdecnumber/decRound.c
@@ -0,0 +1,92 @@
+/* Temporary support for a libc-like fp environment for decimal float.
+   Copyright (C) 2005 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 2, 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.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING.  If not, write to the Free
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA.  */
+
+#include "decContext.h"
+
+#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
+
+extern void __dfp_set_round (int);
+extern int __dfp_get_round (void);
+extern enum rounding __decGetRound (void);
+
+/* FIXME: these should be in thread-local storage for runtime support.  */
+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;
+}