1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
|
dnl A function to check for the possibility to control the FPU.
dnl Copyright (C) 2001-2010 Roberto Bagnara <bagnara@cs.unipr.it>
dnl Copyright (C) 2010-2011 BUGSENG srl (http://bugseng.com)
dnl
dnl This file is part of the Parma Polyhedra Library (PPL).
dnl
dnl The PPL is free software; you can redistribute it and/or modify it
dnl under the terms of the GNU General Public License as published by the
dnl Free Software Foundation; either version 3 of the License, or (at your
dnl option) any later version.
dnl
dnl The PPL is distributed in the hope that it will be useful, but WITHOUT
dnl ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
dnl FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
dnl for more details.
dnl
dnl You should have received a copy of the GNU General Public License
dnl along with this program; if not, write to the Free Software Foundation,
dnl Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
dnl
dnl For the most up-to-date information see the Parma Polyhedra Library
dnl site: http://www.cs.unipr.it/ppl/ .
AC_DEFUN([AC_CHECK_FPU_CONTROL],
[
AC_LANG_PUSH(C++)
AC_CHECK_HEADERS([fenv.h ieeefp.h])
AC_MSG_CHECKING([if it is possible to control the FPU])
AC_RUN_IFELSE([AC_LANG_SOURCE([[
#if i386
int
main() {
return 0;
}
#elif defined(HAVE_FENV_H)
# include <fenv.h>
# if !defined(FE_UPWARD) || !defined(FE_DOWNWARD)
choke me
# elif defined(__arm__) \
&& (!defined(PPL_ARM_CAN_CONTROL_FPU) || !PPL_ARM_CAN_CONTROL_FPU)
choke me
#else
float nf1 = -3, pf1 = 3, f2 = 5;
double nd1 = -7, pd1 = 7, d2 = 11;
long double nl1 = -13, pl1 = 13, l2 = 17;
float nf[2], pf[2];
double nd[2], pd[2];
long double nl[2], pl[2];
int
ppl_check_function() {
int r = 0;
if (nf[0] == nf[1] || pf[0] == pf[1] || -nf[0] != pf[1] || -nf[1] != pf[0])
r |= 1;
if (nd[0] == nd[1] || pd[0] == pd[1] || -nd[0] != pd[1] || -nd[1] != pd[0])
r |= 2;
if (nl[0] == nl[1] || pl[0] == pl[1] || -nl[0] != pl[1] || -nl[1] != pl[0])
r |= 4;
return r;
}
int
ppl_setround_function(int rounding_mode) {
return fesetround(rounding_mode);
}
int (* volatile ppl_check_function_p)() = ppl_check_function;
int (* volatile ppl_setround_function_p)(int) = ppl_setround_function;
int
main() {
if ((*ppl_setround_function_p)(FE_DOWNWARD) != 0)
return 255;
nf[0] = nf1 / f2;
nd[0] = nd1 / d2;
nl[0] = nl1 / l2;
pf[0] = pf1 / f2;
pd[0] = pd1 / d2;
pl[0] = pl1 / l2;
if ((*ppl_setround_function_p)(FE_UPWARD) != 0)
return 255;
nf[1] = nf1 / f2;
nd[1] = nd1 / d2;
nl[1] = nl1 / l2;
pf[1] = pf1 / f2;
pd[1] = pd1 / d2;
pl[1] = pl1 / l2;
return (*ppl_check_function_p)();
}
# endif
#elif sparc && defined(HAVE_IEEEFP_H)
int
main() {
return 0;
}
#else
choke me
#endif
]])],
AC_MSG_RESULT(yes)
ac_cv_can_control_fpu=1,
AC_MSG_RESULT(no)
ac_cv_can_control_fpu=0,
AC_COMPILE_IFELSE([AC_LANG_SOURCE([[
#if i386 || (sparc && defined(HAVE_IEEEFP_H))
int
main() {
return 0;
}
#else
choke me
#endif
]])],
AC_MSG_RESULT(yes)
ac_cv_can_control_fpu=1,
AC_MSG_RESULT(no)
ac_cv_can_control_fpu=0
)
)
AC_LANG_POP(C++)
])
|
