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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libdecnumber/decRound.c
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Diffstat (limited to 'libdecnumber/decRound.c')
-rw-r--r--libdecnumber/decRound.c97
1 files changed, 97 insertions, 0 deletions
diff --git a/libdecnumber/decRound.c b/libdecnumber/decRound.c
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+++ b/libdecnumber/decRound.c
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+/* 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;
+}