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/* PR middle-end/17813 */

/* Origin: Tom Hughes <tom@compton.nu> */

/* { dg-do run { target i?86-*-linux* x86_64-*-linux* } } */

/* { dg-options "-O -fomit-frame-pointer" } */

/* { dg-options "-O -fomit-frame-pointer -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */

#include <setjmp.h>

#include <signal.h>

#include <stdlib.h>

static jmp_buf segv_jmpbuf;

static void segv_handler(int seg)

{

   __builtin_longjmp(segv_jmpbuf, 1);

}

static int is_addressable(void *p, size_t size)

{

   volatile char * volatile cp = (volatile char *)p;

   volatile int ret;

   struct sigaction sa, origsa;

   sigset_t mask;

   sa.sa_handler = segv_handler;

   sa.sa_flags = 0;

   sigfillset(&sa.sa_mask);

   sigaction(SIGSEGV, &sa, &origsa);

   sigprocmask(SIG_SETMASK, NULL, &mask);

   if (__builtin_setjmp(segv_jmpbuf) == 0) {

      while(size--)

         *cp++;

      ret = 1;

    } else

      ret = 0;

   sigaction(SIGSEGV, &origsa, NULL);

   sigprocmask(SIG_SETMASK, &mask, NULL);

   return ret;

}

int main(int argc, char **argv)

{

   is_addressable(0x0, 1);

   return 0;

}