|
0
|
1 /* Internal testing support for rounding for decimal float.
|
|
|
2
|
|
145
|
3 Copyright (C) 2005-2020 Free Software Foundation, Inc.
|
|
0
|
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
|
|
|
9 the Free Software Foundation; either version 3, or (at your option)
|
|
|
10 any later version.
|
|
|
11
|
|
|
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
|
|
|
17 Under Section 7 of GPL version 3, you are granted additional
|
|
|
18 permissions described in the GCC Runtime Library Exception, version
|
|
|
19 3.1, as published by the Free Software Foundation.
|
|
|
20
|
|
|
21 You should have received a copy of the GNU General Public License and
|
|
|
22 a copy of the GCC Runtime Library Exception along with this program;
|
|
|
23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
|
24 <http://www.gnu.org/licenses/>. */
|
|
|
25
|
|
|
26 #include "dconfig.h"
|
|
|
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
|
|
|
40 static enum rounding __dfp_rounding_mode = DEC_ROUND_HALF_EVEN;
|
|
|
41
|
|
|
42 /* Set the decNumber rounding mode from the FE_DEC_* value in MODE. */
|
|
|
43
|
|
|
44 void
|
|
|
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
|
|
|
67 int
|
|
|
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
|
|
|
93 enum rounding
|
|
|
94 __decGetRound (void)
|
|
|
95 {
|
|
|
96 return __dfp_rounding_mode;
|
|
|
97 }
|
