gcc/testsuite/gcc.c-torture/execute/20101011-1.c

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