import of gcc-4.2.1, the last gcc release under GPLv2

1 files changed, 102 insertions, 0 deletions

diff --git a/gnu/gcc/libdecnumber/decRound.c b/gnu/gcc/libdecnumber/decRound.c
new file mode 100644
index 00000000000..3749ecb384d
--- /dev/null
+++ b/gnu/gcc/libdecnumber/decRound.c
@@ -0,0 +1,102 @@
+/* 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.
+
+   In addition to the permissions in the GNU General Public License,
+   the Free Software Foundation gives you unlimited permission to link
+   the compiled version of this file into combinations with other
+   programs, and to distribute those combinations without any
+   restriction coming from the use of this file.  (The General Public
+   License restrictions do apply in other respects; for example, they
+   cover modification of the file, and distribution when not linked
+   into a combine executable.)
+
+   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 "config.h"
+#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;
+}