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;

}