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 /* { 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 #else
 101 # define DO_TEST 1
 102 #endif
 103
 104 extern void abort (void);
 105 extern void exit (int);
 106
 107 #if DO_TEST
 108
 109 #include <signal.h>
 110
 111 void
 112 sigfpe (int signum __attribute__ ((unused)))
 113 {
 114   exit (0);
 115 }
 116
 117 #endif
 118
 119 /* When optimizing, the compiler is smart enough to constant fold the
 120    static unset variables i and j to produce 0 / 0, but it can't
 121    eliminate the assignment to the global k.  */
 122 static int i;
 123 static int j;
 124 int k __attribute__ ((used));
 125
 126 int
 127 main ()
 128 {
 129 #if DO_TEST
 130   signal (SIGFPE, sigfpe);
 131   k = i / j;
 132   abort ();
 133 #else
 134   exit (0);
 135 #endif
 136 }