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1 | /* Internal testing support for rounding for decimal float. |
2 | ||
f57a3bca | 3 | Copyright (C) 2005-2018 Free Software Foundation, Inc. |
f5bc1778 DJ |
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) |
f5bc1778 DJ |
10 | any later version. |
11 | ||
f5bc1778 DJ |
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 | ||
168a2f77 DD |
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/>. */ | |
f5bc1778 | 25 | |
5f5dfcbe | 26 | #include "dconfig.h" |
f5bc1778 DJ |
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 | } |