Subversion Repositories openrisc_2011-10-31

/* Test for reload failing to eliminate from argp to sp.  */
/* { dg-do run } */
/* { dg-require-effective-target ilp32 } */
/* { dg-require-effective-target nonpic } */
/* { dg-options "-O2 -fomit-frame-pointer" } */
 
static int ustrsize (const char *s);
static int (*ucwidth) (int c);
static int (*ugetxc) (const char **s);
static int (*usetc) (char *s, int c);
 
char *ustrzcat(char *dest, int size, const char *src)
{
   int pos = ustrsize(dest);
   int c;
 
   size -= pos + ucwidth(0);
 
   while ((c = ugetxc(&src)) != 0) {
      size -= ucwidth(c);
      if (size < 0)
         break;
 
      pos += usetc(dest+pos, c);
   }
 
   usetc(dest+pos, 0);
 
   return dest;
}
 
static int __attribute__((noinline))
ustrsize (const char *s)
{
  return 0;
}
 
static int
ucwidth_ (int c)
{
  return 1;
}
 
static int
ugetxc_ (const char **s)
{
  return '\0';
}
 
static int
usetc_ (char *s, int c)
{
  return 1;
}
 
int
main()
{
  ucwidth = ucwidth_;
  ugetxc = ugetxc_;
  usetc = usetc_;
 
  /* ??? It is impossible to explicitly modify the hard frame pointer.
     This will run afoul of code in flow.c that declines to mark regs
     in eliminate_regs in regs_ever_used.  Apparently, we have to wait
     for reload to decide that it won't need a frame pointer before a
     variable can be allocated to %ebp.
 
     So save, restore, and clobber %ebp by hand.  */
 
  asm ("pushl %%ebp\n\t"
       "movl $-1, %%ebp\n\t"
       "pushl $0\n\t"
       "pushl $0\n\t"
       "pushl $0\n\t"
       "call %P0\n\t"
       "addl $12, %%esp\n\t"
       "popl %%ebp"
       : : "i"(ustrzcat) : "memory" );
 
  return 0;
}