ppc64-fp.c revision 117395 
1/* Functions needed for soft-float on powerpc64-linux, copied from
2   libgcc2.c with macros expanded to force the use of specific types.
3
4   Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
5   2000, 2001, 2002, 2003  Free Software Foundation, Inc.
6
7This file is part of GCC.
8
9GCC is free software; you can redistribute it and/or modify it under
10the terms of the GNU General Public License as published by the Free
11Software Foundation; either version 2, or (at your option) any later
12version.
13
14In addition to the permissions in the GNU General Public License, the
15Free Software Foundation gives you unlimited permission to link the
16compiled version of this file into combinations with other programs,
17and to distribute those combinations without any restriction coming
18from the use of this file.  (The General Public License restrictions
19do apply in other respects; for example, they cover modification of
20the file, and distribution when not linked into a combine
21executable.)
22
23GCC is distributed in the hope that it will be useful, but WITHOUT ANY
24WARRANTY; without even the implied warranty of MERCHANTABILITY or
25FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
26for more details.
27
28You should have received a copy of the GNU General Public License
29along with GCC; see the file COPYING.  If not, write to the Free
30Software Foundation, 59 Temple Place - Suite 330, Boston, MA
3102111-1307, USA.  */
32
33#if defined(__powerpc64__)
34#include "fp-bit.h"
35
36extern DItype __fixdfdi (DFtype);
37extern DItype __fixsfdi (SFtype);
38extern USItype __fixunsdfsi (DFtype);
39extern USItype __fixunssfsi (SFtype);
40extern DFtype __floatdidf (DItype);
41extern SFtype __floatdisf (DItype);
42
43static DItype local_fixunssfdi (SFtype);
44static DItype local_fixunsdfdi (DFtype);
45
46DItype
47__fixdfdi (DFtype a)
48{
49  if (a < 0)
50    return - local_fixunsdfdi (-a);
51  return local_fixunsdfdi (a);
52}
53
54DItype
55__fixsfdi (SFtype a)
56{
57  if (a < 0)
58    return - local_fixunssfdi (-a);
59  return local_fixunssfdi (a);
60}
61
62USItype
63__fixunsdfsi (DFtype a)
64{
65  if (a >= - (DFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
66    return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
67                       - (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
68  return (SItype) a;
69}
70
71USItype
72__fixunssfsi (SFtype a)
73{
74  if (a >= - (SFtype) (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
75    return (SItype) (a + (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1))
76                       - (- ((SItype)(((USItype)1 << ((4 * 8) - 1)) - 1)) - 1);
77  return (SItype) a;
78}
79
80DFtype
81__floatdidf (DItype u)
82{
83  DFtype d;
84
85  d = (SItype) (u >> (sizeof (SItype) * 8));
86  d *= (((UDItype) 1) << ((sizeof (SItype) * 8) / 2));
87  d *= (((UDItype) 1) << ((sizeof (SItype) * 8) / 2));
88  d += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
89
90  return d;
91}
92
93SFtype
94__floatdisf (DItype u)
95{
96  DFtype f;
97
98  if (53 < (sizeof (DItype) * 8)
99      && 53 > ((sizeof (DItype) * 8) - 53 + 24))
100    {
101      if (! (- ((DItype) 1 << 53) < u
102             && u < ((DItype) 1 << 53)))
103        {
104          if ((UDItype) u & (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1))
105            {
106              u &= ~ (((UDItype) 1 << ((sizeof (DItype) * 8) - 53)) - 1);
107              u |= ((UDItype) 1 << ((sizeof (DItype) * 8) - 53));
108            }
109        }
110    }
111  f = (SItype) (u >> (sizeof (SItype) * 8));
112  f *= (((UDItype) 1) << ((sizeof (SItype) * 8) / 2));
113  f *= (((UDItype) 1) << ((sizeof (SItype) * 8) / 2));
114  f += (USItype) (u & ((((UDItype) 1) << (sizeof (SItype) * 8)) - 1));
115
116  return (SFtype) f;
117}
118
119/* This version is needed to prevent recursion; fixunsdfdi in libgcc
120   calls fixdfdi, which in turn calls calls fixunsdfdi.  */
121
122static DItype
123local_fixunsdfdi (DFtype a)
124{
125  USItype hi, lo;
126
127  hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
128  lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
129  return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
130}
131
132/* This version is needed to prevent recursion; fixunssfdi in libgcc
133   calls fixsfdi, which in turn calls calls fixunssfdi.  */
134
135static DItype
136local_fixunssfdi (SFtype original_a)
137{
138  DFtype a = original_a;
139  USItype hi, lo;
140
141  hi = a / (((UDItype) 1) << (sizeof (SItype) * 8));
142  lo = (a - ((DFtype) hi) * (((UDItype) 1) << (sizeof (SItype) * 8)));
143  return ((UDItype) hi << (sizeof (SItype) * 8)) | lo;
144}
145
146#endif /* __powerpc64__ */
147