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1/* Internal testing support for rounding for decimal float.
2
f57a3bca 3 Copyright (C) 2005-2018 Free Software Foundation, Inc.
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4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by
168a2f77 9 the Free Software Foundation; either version 3, or (at your option)
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10 any later version.
11
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12 GCC is distributed in the hope that it will be useful, but WITHOUT
13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
15 License for more details.
16
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17Under Section 7 of GPL version 3, you are granted additional
18permissions described in the GCC Runtime Library Exception, version
193.1, as published by the Free Software Foundation.
20
21You should have received a copy of the GNU General Public License and
22a copy of the GCC Runtime Library Exception along with this program;
23see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
24<http://www.gnu.org/licenses/>. */
f5bc1778 25
5f5dfcbe 26#include "dconfig.h"
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27#include "decContext.h"
28#include "decRound.h"
29
30/* Internal, non-documented functions for testing libgcc functions.
31 This support is not sufficient for application use. */
32
33#define FE_DEC_DOWNWARD 0
34#define FE_DEC_TONEAREST 1
35#define FE_DEC_TONEARESTFROMZERO 2
36#define FE_DEC_TOWARDZERO 3
37#define FE_DEC_UPWARD 4
38#define FE_DEC_MAX 5
39
40static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN;
41
42/* Set the decNumber rounding mode from the FE_DEC_* value in MODE. */
43
44void
45__dfp_set_round (int mode)
46{
47 switch (mode)
48 {
49 case FE_DEC_DOWNWARD:
50 __dfp_rounding_mode = DEC_ROUND_FLOOR; break;
51 case FE_DEC_TONEAREST:
52 __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
53 case FE_DEC_TONEARESTFROMZERO:
54 __dfp_rounding_mode = DEC_ROUND_HALF_UP; break;
55 case FE_DEC_TOWARDZERO:
56 __dfp_rounding_mode = DEC_ROUND_DOWN; break;
57 case FE_DEC_UPWARD:
58 __dfp_rounding_mode = DEC_ROUND_CEILING; break;
59 default:
60 /* We can't use assert in libgcc, so just return the default mode. */
61 __dfp_rounding_mode = DEC_ROUND_HALF_EVEN; break;
62 }
63}
64
65/* Return the decNumber rounding mode as an FE_DEC_* value. */
66
67int
68__dfp_get_round (void)
69{
70 int mode;
71
72 switch (__dfp_rounding_mode)
73 {
74 case DEC_ROUND_FLOOR:
75 mode = FE_DEC_DOWNWARD; break;
76 case DEC_ROUND_HALF_EVEN:
77 mode = FE_DEC_TONEAREST; break;
78 case DEC_ROUND_HALF_UP:
79 mode = FE_DEC_TONEARESTFROMZERO; break;
80 case DEC_ROUND_DOWN:
81 mode = FE_DEC_TOWARDZERO; break;
82 case DEC_ROUND_CEILING:
83 mode = FE_DEC_UPWARD; break;
84 default:
85 /* We shouldn't get here, but can't use assert in libgcc. */
86 mode = -1;
87 }
88 return mode;
89}
90
91/* Return the decNumber version of the current rounding mode. */
92
93enum rounding
94__decGetRound (void)
95{
96 return __dfp_rounding_mode;
97}