modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/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  /* { dg-additional-options "-DSIGNAL_SUPPRESS" { target { ! signal } } } */
     4  
     5  #ifdef SIGNAL_SUPPRESS
     6  # define DO_TEST 0
     7  #elif defined (__powerpc__) || defined (__PPC__) || defined (__ppc__) || defined (__POWERPC__) || defined (__ppc)
     8    /* On PPC division by zero does not trap.  */
     9  # define DO_TEST 0
    10  #elif defined (__riscv)
    11    /* On RISC-V division by zero does not trap.  */
    12  # define DO_TEST 0
    13  #elif defined (__SPU__)
    14    /* On SPU division by zero does not trap.  */
    15  # define DO_TEST 0
    16  #elif defined (__sh__)
    17    /* On SH division by zero does not trap.  */
    18  # define DO_TEST 0
    19  #elif defined (__v850__)
    20    /* On V850 division by zero does not trap.  */
    21  # define DO_TEST 0
    22  #elif defined (__MSP430__)
    23    /* On MSP430 division by zero does not trap.  */
    24  # define DO_TEST 0
    25  #elif defined (__RL78__)
    26    /* On RL78 division by zero does not trap.  */
    27  # define DO_TEST 0
    28  #elif defined (__RX__)
    29    /* On RX division by zero does not trap.  */
    30  # define DO_TEST 0
    31  #elif defined (__aarch64__)
    32    /* On AArch64 integer division by zero does not trap.  */
    33  # define DO_TEST 0
    34  #elif defined (__TMS320C6X__)
    35    /* On TI C6X division by zero does not trap.  */
    36  # define DO_TEST 0
    37  #elif defined (__VISIUM__)
    38    /* On Visium division by zero does not trap.  */
    39  # define DO_TEST 0
    40  #elif defined (__mips__) && !defined(__linux__)
    41    /* MIPS divisions do trap by default, but libgloss targets do not
    42       intercept the trap and raise a SIGFPE.  The same is probably
    43       true of other bare-metal environments, so restrict the test to
    44       systems that use the Linux kernel.  */
    45  # define DO_TEST 0
    46  #elif defined (__mips16) && defined(__linux__)
    47    /* Not all Linux kernels deal correctly the breakpoints generated by
    48       MIPS16 divisions by zero.  They show up as a SIGTRAP instead.  */
    49  # define DO_TEST 0
    50  #elif defined (__MICROBLAZE__)
    51  /* We cannot rely on division by zero generating a trap. */
    52  # define DO_TEST 0
    53  #elif defined (__epiphany__)
    54    /* Epiphany does not have hardware division, and the software implementation
    55       has truly undefined behavior for division by 0.  */
    56  # define DO_TEST 0
    57  #elif defined (__m68k__) && !defined(__linux__)
    58    /* Attempting to trap division-by-zero in this way isn't likely to work on 
    59       bare-metal m68k systems.  */
    60  # define DO_TEST 0
    61  #elif defined (__CRIS__)
    62    /* No SIGFPE for CRIS integer division.  */
    63  # define DO_TEST 0
    64  #elif defined (__MMIX__)
    65  /* By default we emit a sequence with DIVU, which "never signals an
    66     exceptional condition, even when dividing by zero".  */
    67  # define DO_TEST 0
    68  #elif defined (__arc__)
    69    /* No SIGFPE for ARC integer division.  */
    70  # define DO_TEST 0
    71  #elif defined (__arm__) && defined (__ARM_EABI__)
    72  # ifdef __ARM_ARCH_EXT_IDIV__
    73    /* Hardware division instructions may not trap, and handle trapping
    74       differently anyway.  Skip the test if we have those instructions.  */
    75  #  define DO_TEST 0
    76  # else
    77  #  include <signal.h>
    78    /* ARM division-by-zero behavior is to call a helper function, which
    79       can do several different things, depending on requirements.  Emulate
    80       the behavior of other targets here by raising SIGFPE.  */
    81  int __attribute__((used))
    82  __aeabi_idiv0 (int return_value)
    83  {
    84    raise (SIGFPE);
    85    return return_value;
    86  }
    87  #  define DO_TEST 1
    88  # endif
    89  #elif defined (__nios2__)
    90    /* Nios II requires both hardware support and user configuration to
    91       raise an exception on divide by zero.  */
    92  # define DO_TEST 0
    93  #elif defined (__nvptx__)
    94  /* There isn't even a signal function.  */
    95  # define DO_TEST 0
    96  #elif defined (__csky__)
    97    /* This presently doesn't raise SIGFPE even on csky-linux-gnu, much
    98       less bare metal.  See the implementation of __divsi3 in libgcc.  */
    99  # define DO_TEST 0
   100  #elif defined (__moxie__)
   101    /* Not all moxie configurations may raise exceptions.  */
   102  # define DO_TEST 0
   103  #elif defined (__or1k__)
   104    /* On OpenRISC division by zero does not trap.  */
   105  # define DO_TEST 0
   106  #else
   107  # define DO_TEST 1
   108  #endif
   109  
   110  extern void abort (void);
   111  extern void exit (int);
   112  
   113  #if DO_TEST
   114  
   115  #include <signal.h>
   116  
   117  void
   118  sigfpe (int signum __attribute__ ((unused)))
   119  {
   120    exit (0);
   121  }
   122  
   123  #endif
   124  
   125  /* When optimizing, the compiler is smart enough to constant fold the
   126     static unset variables i and j to produce 0 / 0, but it can't
   127     eliminate the assignment to the global k.  */
   128  static int i;
   129  static int j;
   130  int k __attribute__ ((used));
   131  
   132  int
   133  main ()
   134  {
   135  #if DO_TEST
   136    signal (SIGFPE, sigfpe);
   137    k = i / j;
   138    abort ();
   139  #else
   140    exit (0);
   141  #endif
   142  }