Mercurial > hg > CbC > CbC_gcc

comparison libgcc/config/s390/32/_fixunsdfdi.c @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
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children 04ced10e8804
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52:c156f1bd5cd9 55:77e2b8dfacca
1 /* Definitions of target machine for GNU compiler, for IBM S/390
2 Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009
3 Free Software Foundation, Inc.
4 Contributed by Hartmut Penner (hpenner@de.ibm.com) and
5 Ulrich Weigand (uweigand@de.ibm.com).
6
7 This file is part of GCC.
8
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
12 version.
13
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 for more details.
18
19 Under Section 7 of GPL version 3, you are granted additional
20 permissions described in the GCC Runtime Library Exception, version
21 3.1, as published by the Free Software Foundation.
22
23 You should have received a copy of the GNU General Public License and
24 a copy of the GCC Runtime Library Exception along with this program;
25 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
26 <http://www.gnu.org/licenses/>. */
27
28 #define EXPD(fp) (((fp.l.upper) >> 20) & 0x7FF)
29 #define EXCESSD 1022
30 #define SIGNBIT 0x80000000
31 #define SIGND(fp) ((fp.l.upper) & SIGNBIT)
32 #define MANTD_LL(fp) ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
33 #define FRACD_LL(fp) (fp.ll & (HIDDEND_LL-1))
34 #define HIDDEND_LL ((UDItype_x)1 << 52)
35
36 typedef int DItype_x __attribute__ ((mode (DI)));
37 typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
38 typedef int SItype_x __attribute__ ((mode (SI)));
39 typedef unsigned int USItype_x __attribute__ ((mode (SI)));
40
41 union double_long {
42 double d;
43 struct {
44 SItype_x upper;
45 USItype_x lower;
46 } l;
47 UDItype_x ll;
48 };
49
50 UDItype_x __fixunsdfdi (double a1);
51
52 /* convert double to unsigned int */
53 UDItype_x
54 __fixunsdfdi (double a1)
55 {
56 register union double_long dl1;
57 register int exp;
58 register UDItype_x l;
59
60 dl1.d = a1;
61
62 /* +/- 0, denormalized, negative */
63
64 if (!EXPD (dl1) || SIGND(dl1))
65 return 0;
66
67 exp = EXPD (dl1) - EXCESSD - 53;
68
69 /* number < 1 */
70
71 if (exp < -53)
72 return 0;
73
74 /* NaN */
75
76 if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */
77 return 0x0ULL;
78
79 /* Number big number & + inf */
80
81 if (exp >= 12) {
82 return 0xFFFFFFFFFFFFFFFFULL;
83 }
84
85 l = MANTD_LL(dl1);
86
87 /* shift down until exp < 12 or l = 0 */
88 if (exp > 0)
89 l <<= exp;
90 else
91 l >>= -exp;
92
93 return l;
94 }