1  /* { dg-do run { target { ! avr_tiny } } } */
       2  /* { dg-options { -fno-peephole2 } } */
       3  
       4  #include <stdlib.h>
       5  
       6  typedef __UINT16_TYPE__ uint16_t;
       7  typedef __INT16_TYPE__  int16_t;
       8  typedef __UINT8_TYPE__  uint8_t;
       9  
      10  uint8_t __attribute__((noinline,noclone))
      11  fun_inc (uint8_t c0)
      12  {
      13    register uint8_t c asm ("r15") = c0;
      14  
      15    /* Force target value into R15 (lower register)  */
      16    asm ("" : "+l" (c));
      17  
      18    c++;
      19    if (c >= 0x80)
      20      c = 0;
      21    
      22    asm ("" : "+l" (c));
      23  
      24    return c;
      25  }
      26  
      27  uint8_t __attribute__((noinline,noclone))
      28  fun_dec (uint8_t c0)
      29  {
      30    register uint8_t c asm ("r15") = c0;
      31  
      32    /* Force target value into R15 (lower register)  */
      33    asm ("" : "+l" (c));
      34  
      35    c--;
      36    if (c < 0x80)
      37      c = 0;
      38    
      39    asm ("" : "+l" (c));
      40  
      41    return c;
      42  }
      43  
      44  
      45  uint8_t __attribute__((noinline,noclone))
      46  fun_neg (uint8_t c0)
      47  {
      48    register uint8_t c asm ("r15") = c0;
      49  
      50    c = -c;
      51    if (c >= 0x80)
      52      c = 0;
      53  
      54    return c;
      55  }
      56  
      57  uint16_t __attribute__((noinline,noclone))
      58  fun_adiw (uint16_t c0)
      59  {
      60    register uint16_t c asm ("r24") = c0;
      61  
      62    /* Force target value into R24 (for ADIW) */
      63    asm ("" : "+r" (c));
      64  
      65    c += 2;
      66    if (c >= 0x8000)
      67      c = 0;
      68  
      69    asm ("" : "+r" (c));
      70    
      71    return c;
      72  }
      73  
      74  
      75  int main()
      76  {
      77    if (fun_inc (0x7f) != 0)
      78      abort();
      79    
      80    if (fun_neg (0x80) != 0)
      81      abort();
      82    
      83    if (fun_adiw (0x7ffe) != 0)
      84      abort();
      85  
      86    exit (0);
      87    return 0;
      88  }