1  /* The RTL loop optimizer used to replace the output register of the
       2     inline assembly with a pseudo although the variable is declared as
       3     register asm ("0").  */
       4  
       5  /* { dg-do run } */
       6  /* { dg-options "-O2 -Wno-attributes -Wno-implicit-function-declaration" } */
       7  
       8  extern void abort (void);
       9  
      10  static unsigned char __attribute__ ((always_inline))
      11  mytoupper (unsigned char c)
      12  {
      13    if (c >= 'a' && c <= 'z')
      14      c -= 'a' - 'A';
      15    return c;
      16  }
      17  
      18  static unsigned long __attribute__ ((always_inline))
      19  strlen (const char *s)
      20  {
      21    register unsigned long r0 asm ("0");
      22    const char *tmp = s;
      23  
      24    asm (
      25  #ifdef __s390x__
      26         "  lghi  %0, 0\n"
      27  #else
      28         "  lhi   %0, 0\n"
      29  #endif
      30         "0:srst  %0,%1\n"
      31         "  jo    0b"
      32         : "=d" (r0), "+a" (tmp)
      33         :
      34         :"cc");
      35    return r0 - (unsigned long) s;
      36  }
      37  
      38  char boot_command_line[] = "this is a test";
      39  
      40  void __attribute__ ((noinline))
      41  foo (char *str)
      42  {
      43    if (strcmp (str, "THIS IS A TEST") != 0)
      44      abort ();
      45  }
      46  
      47  int
      48  main ()
      49  {
      50    char upper_command_line[1024];
      51    int i;
      52  
      53    for (i = 0; i < strlen (boot_command_line); i++)
      54      upper_command_line[i] = mytoupper (boot_command_line[i]);
      55  
      56    upper_command_line[strlen (boot_command_line)] = 0;
      57    foo (upper_command_line);
      58  
      59    return 0;
      60  }