blob: 34d03137e26e62b62810978adb5416cc7b454f4a (
plain)
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
|
/* { dg-options "-fnon-call-exceptions" } */
/* With -fnon-call-exceptions 0 / 0 should not be eliminated. */
#ifdef SIGNAL_SUPPRESS
# define DO_TEST 0
#elif defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) || defined (__POWERPC__) || defined (__ppc)
/* On PPC division by zero does not trap. */
# define DO_TEST 0
#elif defined (__SPU__)
/* On SPU division by zero does not trap. */
# define DO_TEST 0
#elif defined (__sh__)
/* On SH division by zero does not trap. */
# define DO_TEST 0
#elif defined (__aarch64__)
/* On AArch64 integer division by zero does not trap. */
# define DO_TEST 0
#elif defined (__TMS320C6X__)
/* On TI C6X division by zero does not trap. */
# define DO_TEST 0
#elif defined (__mips__) && !defined(__linux__)
/* MIPS divisions do trap by default, but libgloss targets do not
intercept the trap and raise a SIGFPE. The same is probably
true of other bare-metal environments, so restrict the test to
systems that use the Linux kernel. */
# define DO_TEST 0
#elif defined (__mips16) && defined(__linux__)
/* Not all Linux kernels deal correctly the breakpoints generated by
MIPS16 divisions by zero. They show up as a SIGTRAP instead. */
# define DO_TEST 0
#elif defined (__MICROBLAZE__)
/* We cannot rely on division by zero generating a trap. */
# define DO_TEST 0
#elif defined (__epiphany__)
/* Epiphany does not have hardware division, and the software implementation
has truly undefined behaviour for division by 0. */
# define DO_TEST 0
#elif defined (__m68k__) && !defined(__linux__)
/* Attempting to trap division-by-zero in this way isn't likely to work on
bare-metal m68k systems. */
# define DO_TEST 0
#elif defined (__CRIS__)
/* No SIGFPE for CRIS integer division. */
# define DO_TEST 0
#elif defined (__MMIX__)
/* By default we emit a sequence with DIVU, which "never signals an
exceptional condition, even when dividing by zero". */
# define DO_TEST 0
#elif defined (__arc__)
/* No SIGFPE for ARC integer division. */
# define DO_TEST 0
#elif defined (__arm__) && defined (__ARM_EABI__)
# ifdef __ARM_ARCH_EXT_IDIV__
/* Hardware division instructions may not trap, and handle trapping
differently anyway. Skip the test if we have those instructions. */
# define DO_TEST 0
# else
# include <signal.h>
/* ARM division-by-zero behaviour is to call a helper function, which
can do several different things, depending on requirements. Emulate
the behaviour of other targets here by raising SIGFPE. */
int __attribute__((used))
__aeabi_idiv0 (int return_value)
{
raise (SIGFPE);
return return_value;
}
# define DO_TEST 1
# endif
#elif defined (__nios2__)
/* Nios II requires both hardware support and user configuration to
raise an exception on divide by zero. */
# define DO_TEST 0
#elif defined (__nvptx__)
/* There isn't even a signal function. */
# define DO_TEST 0
#else
# define DO_TEST 1
#endif
extern void abort (void);
extern void exit (int);
#if DO_TEST
#include <signal.h>
void
sigfpe (int signum __attribute__ ((unused)))
{
exit (0);
}
#endif
/* When optimizing, the compiler is smart enough to constant fold the
static unset variables i and j to produce 0 / 0, but it can't
eliminate the assignment to the global k. */
static int i;
static int j;
int k __attribute__ ((used));
int
main ()
{
#if DO_TEST
signal (SIGFPE, sigfpe);
k = i / j;
abort ();
#else
exit (0);
#endif
}
|
