merge from gcc
[deliverable/binutils-gdb.git] / libdecnumber / bid / decimal128.c
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168a2f77 1/* Copyright (C) 2007, 2009
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2 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
168a2f77 8Software Foundation; either version 3, or (at your option) any later
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9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14for more details.
15
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16Under Section 7 of GPL version 3, you are granted additional
17permissions described in the GCC Runtime Library Exception, version
183.1, as published by the Free Software Foundation.
f5bc1778 19
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20You should have received a copy of the GNU General Public License and
21a copy of the GCC Runtime Library Exception along with this program;
22see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23<http://www.gnu.org/licenses/>. */
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24
25#define decimal128FromString __dpd128FromString
26#define decimal128ToString __dpd128ToString
27#define decimal128ToEngString __dpd128ToEngString
28#define decimal128FromNumber __dpd128FromNumber
29#define decimal128ToNumber __dpd128ToNumber
30
31#include "dpd/decimal128.c"
32
33#undef decimal128FromString
34#undef decimal128ToString
35#undef decimal128ToEngString
36#undef decimal128FromNumber
37#undef decimal128ToNumber
38
39#include "bid-dpd.h"
40
41#ifdef IN_LIBGCC2
42#define decimal128FromString __decimal128FromString
43#define decimal128ToString __decimal128ToString
44#define decimal128ToEngString __decimal128ToEngString
45#define decimal128FromNumber __decimal128FromNumber
46#define decimal128ToNumber __decimal128ToNumber
47#endif
48
49decimal128 *decimal128FromString (decimal128 *, const char *, decContext *);
50char *decimal128ToString (const decimal128 *, char *);
51char *decimal128ToEngString (const decimal128 *, char *);
52decimal128 *decimal128FromNumber (decimal128 *, const decNumber *, decContext *);
53decNumber *decimal128ToNumber (const decimal128 *, decNumber *);
54
55void __host_to_ieee_128 (_Decimal128 in, decimal128 *out);
56void __ieee_to_host_128 (decimal128 in, _Decimal128 *out);
57
58decimal128 *
59decimal128FromNumber (decimal128 *d128, const decNumber *dn,
60 decContext *set)
61{
62 /* decimal128 and _Decimal128 are different types. */
63 union
64 {
65 _Decimal128 _Dec;
66 decimal128 dec;
67 } u;
68
69 __dpd128FromNumber (d128, dn, set);
70
71 /* __dpd128FromNumber returns in big endian. But _dpd_to_bid128 takes
72 host endian. */
73 __ieee_to_host_128 (*d128, &u._Dec);
74
75 /* Convert DPD to BID. */
76 _dpd_to_bid128 (&u._Dec, &u._Dec);
77
78 /* dfp.c is in bid endian. */
79 __host_to_ieee_128 (u._Dec, &u.dec);
80
81 /* d128 is returned as a pointer to _Decimal128 here. */
82 *d128 = u.dec;
83
84 return d128;
85}
86
87decNumber *
88decimal128ToNumber (const decimal128 *bid128, decNumber *dn)
89{
90 /* decimal128 and _Decimal128 are different types. */
91 union
92 {
93 _Decimal128 _Dec;
94 decimal128 dec;
95 } u;
96
97 /* bid128 is a pointer to _Decimal128 in bid endian. But _bid_to_dpd128
98 takes host endian. */
99 __ieee_to_host_128 (*bid128, &u._Dec);
100
101 /* Convert BID to DPD. */
102 _bid_to_dpd128 (&u._Dec, &u._Dec);
103
104 /* __dpd128ToNumber is in bid endian. */
105 __host_to_ieee_128 (u._Dec, &u.dec);
106
107 return __dpd128ToNumber (&u.dec, dn);
108}
109
110char *
111decimal128ToString (const decimal128 *d128, char *string)
112{
113 decNumber dn; /* work */
114 decimal128ToNumber (d128, &dn);
115 decNumberToString (&dn, string);
116 return string;
117}
118
119char *
120decimal128ToEngString (const decimal128 *d128, char *string)
121{
122 decNumber dn; /* work */
123 decimal128ToNumber (d128, &dn);
124 decNumberToEngString (&dn, string);
125 return string;
126}
127
128decimal128 *
129decimal128FromString (decimal128 *result, const char *string,
130 decContext *set)
131{
132 decContext dc; /* work */
133 decNumber dn; /* .. */
134
135 decContextDefault (&dc, DEC_INIT_DECIMAL128); /* no traps, please */
136 dc.round = set->round; /* use supplied rounding */
137
138 decNumberFromString (&dn, string, &dc); /* will round if needed */
139 decimal128FromNumber (result, &dn, &dc);
140 if (dc.status != 0)
141 { /* something happened */
142 decContextSetStatus (set, dc.status); /* .. pass it on */
143 }
144 return result;
145}
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