1  /* { dg-require-effective-target vect_int } */
       2  /* { dg-require-effective-target vect_shift } */
       3  /* { dg-require-effective-target vect_pack_trunc } */
       4  /* { dg-require-effective-target vect_unpack } */
       5  
       6  #include "tree-vect.h"
       7  
       8  #ifndef SIGNEDNESS
       9  #define SIGNEDNESS signed
      10  #define BASE_B -128
      11  #define BASE_C -100
      12  #endif
      13  
      14  #define N 50
      15  
      16  /* Both range analysis and backward propagation from the truncation show
      17     that these calculations can be done in SIGNEDNESS short.  */
      18  void __attribute__ ((noipa))
      19  f (SIGNEDNESS char *restrict a, SIGNEDNESS char *restrict b,
      20     SIGNEDNESS char *restrict c)
      21  {
      22    /* Deliberate use of signed >>.  */
      23    for (int i = 0; i < N; ++i)
      24      a[i] = (b[i] + c[i]) >> 1;
      25  }
      26  
      27  int
      28  main (void)
      29  {
      30    check_vect ();
      31  
      32    SIGNEDNESS char a[N], b[N], c[N];
      33    for (int i = 0; i < N; ++i)
      34      {
      35        b[i] = BASE_B + i * 5;
      36        c[i] = BASE_C + i * 4;
      37        asm volatile ("" ::: "memory");
      38      }
      39    f (a, b, c);
      40    for (int i = 0; i < N; ++i)
      41      if (a[i] != (BASE_B + BASE_C + i * 9) >> 1)
      42        __builtin_abort ();
      43  
      44    return 0;
      45  }
      46  
      47  /* { dg-final { scan-tree-dump {Splitting statement} "vect" } } */
      48  /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* \+ } "vect" } } */
      49  /* { dg-final { scan-tree-dump {vect_recog_over_widening_pattern: detected:[^\n]* >> 1} "vect" } } */
      50  /* { dg-final { scan-tree-dump {vect_recog_cast_forwprop_pattern: detected:[^\n]* \(signed char\)} "vect" } } */
      51  /* { dg-final { scan-tree-dump-not {vector[^ ]* int} "vect" } } */
      52  /* { dg-final { scan-tree-dump-times "vectorized 1 loop" 1 "vect" } } */