modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/execute/20101011-1.c (about)

     1  /* { dg-options "-fnon-call-exceptions" } */
     2  /* With -fnon-call-exceptions 0 / 0 should not be eliminated.  */
     3  
     4  #ifdef SIGNAL_SUPPRESS
     5  # define DO_TEST 0
     6  #elif defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) || defined (__POWERPC__) || defined (__ppc)
     7    /* On PPC division by zero does not trap.  */
     8  # define DO_TEST 0
     9  #elif defined (__SPU__)
    10    /* On SPU division by zero does not trap.  */
    11  # define DO_TEST 0
    12  #elif defined (__sh__)
    13    /* On SH division by zero does not trap.  */
    14  # define DO_TEST 0
    15  #elif defined (__v850__)
    16    /* On V850 division by zero does not trap.  */
    17  # define DO_TEST 0
    18  #elif defined (__MSP430__)
    19    /* On MSP430 division by zero does not trap.  */
    20  # define DO_TEST 0
    21  #elif defined (__RL78__)
    22    /* On RL78 division by zero does not trap.  */
    23  # define DO_TEST 0
    24  #elif defined (__RX__)
    25    /* On RX division by zero does not trap.  */
    26  # define DO_TEST 0
    27  #elif defined (__aarch64__)
    28    /* On AArch64 integer division by zero does not trap.  */
    29  # define DO_TEST 0
    30  #elif defined (__TMS320C6X__)
    31    /* On TI C6X division by zero does not trap.  */
    32  # define DO_TEST 0
    33  #elif defined (__VISIUM__)
    34    /* On Visium division by zero does not trap.  */
    35  # define DO_TEST 0
    36  #elif defined (__mips__) && !defined(__linux__)
    37    /* MIPS divisions do trap by default, but libgloss targets do not
    38       intercept the trap and raise a SIGFPE.  The same is probably
    39       true of other bare-metal environments, so restrict the test to
    40       systems that use the Linux kernel.  */
    41  # define DO_TEST 0
    42  #elif defined (__mips16) && defined(__linux__)
    43    /* Not all Linux kernels deal correctly the breakpoints generated by
    44       MIPS16 divisions by zero.  They show up as a SIGTRAP instead.  */
    45  # define DO_TEST 0
    46  #elif defined (__MICROBLAZE__)
    47  /* We cannot rely on division by zero generating a trap. */
    48  # define DO_TEST 0
    49  #elif defined (__epiphany__)
    50    /* Epiphany does not have hardware division, and the software implementation
    51       has truly undefined behavior for division by 0.  */
    52  # define DO_TEST 0
    53  #elif defined (__m68k__) && !defined(__linux__)
    54    /* Attempting to trap division-by-zero in this way isn't likely to work on 
    55       bare-metal m68k systems.  */
    56  # define DO_TEST 0
    57  #elif defined (__CRIS__)
    58    /* No SIGFPE for CRIS integer division.  */
    59  # define DO_TEST 0
    60  #elif defined (__MMIX__)
    61  /* By default we emit a sequence with DIVU, which "never signals an
    62     exceptional condition, even when dividing by zero".  */
    63  # define DO_TEST 0
    64  #elif defined (__arc__)
    65    /* No SIGFPE for ARC integer division.  */
    66  # define DO_TEST 0
    67  #elif defined (__arm__) && defined (__ARM_EABI__)
    68  # ifdef __ARM_ARCH_EXT_IDIV__
    69    /* Hardware division instructions may not trap, and handle trapping
    70       differently anyway.  Skip the test if we have those instructions.  */
    71  #  define DO_TEST 0
    72  # else
    73  #  include <signal.h>
    74    /* ARM division-by-zero behavior is to call a helper function, which
    75       can do several different things, depending on requirements.  Emulate
    76       the behavior of other targets here by raising SIGFPE.  */
    77  int __attribute__((used))
    78  __aeabi_idiv0 (int return_value)
    79  {
    80    raise (SIGFPE);
    81    return return_value;
    82  }
    83  #  define DO_TEST 1
    84  # endif
    85  #elif defined (__nios2__)
    86    /* Nios II requires both hardware support and user configuration to
    87       raise an exception on divide by zero.  */
    88  # define DO_TEST 0
    89  #elif defined (__nvptx__)
    90  /* There isn't even a signal function.  */
    91  # define DO_TEST 0
    92  #else
    93  # define DO_TEST 1
    94  #endif
    95  
    96  extern void abort (void);
    97  extern void exit (int);
    98  
    99  #if DO_TEST
   100  
   101  #include <signal.h>
   102  
   103  void
   104  sigfpe (int signum __attribute__ ((unused)))
   105  {
   106    exit (0);
   107  }
   108  
   109  #endif
   110  
   111  /* When optimizing, the compiler is smart enough to constant fold the
   112     static unset variables i and j to produce 0 / 0, but it can't
   113     eliminate the assignment to the global k.  */
   114  static int i;
   115  static int j;
   116  int k __attribute__ ((used));
   117  
   118  int
   119  main ()
   120  {
   121  #if DO_TEST
   122    signal (SIGFPE, sigfpe);
   123    k = i / j;
   124    abort ();
   125  #else
   126    exit (0);
   127  #endif
   128  }