1  /* Check that eliminable compare-instructions are eliminated. */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O2" } */
       4  /* { dg-final { scan-assembler-not "\tcmp|\ttest" } } */
       5  /* { dg-final { scan-assembler "\tneg" } } */
       6  
       7  void foo(void);
       8  
       9  #ifndef op
      10  #define op(x) -(x)
      11  #endif
      12  
      13  #define f(k, T, T2)				\
      14  void f ## k (T *a, T2 *b)			\
      15  {						\
      16    T2 d = op(*a);				\
      17    *b = d;					\
      18    if (d != 0)					\
      19      foo();					\
      20  }
      21  
      22  #define ff(x, y) f(x, y, y)
      23  
      24  /* For NEG, gcc prefers to test the source (before the operation), but
      25     will settle for the destination.  For SImode, the destination is
      26     allocated to a different register than the source.  Not that
      27     important; just skip the "int" variant for now.  */
      28  #ifndef do_1
      29  #define do_1 0
      30  #endif
      31  
      32  #ifndef do_2
      33  #define do_2 1
      34  #endif
      35  #ifndef do_3
      36  #define do_3 1
      37  #endif
      38  
      39  #if do_1
      40  ff(1, int)
      41  #endif
      42  
      43  #if do_2
      44  ff(2, short int)
      45  #endif
      46  
      47  #if do_3
      48  ff(3, signed char)
      49  #endif