gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s16a.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 64
   7 #define DOT 43680
   8
   9 signed short X[N] __attribute__ ((__aligned__(16)));
  10 signed short Y[N] __attribute__ ((__aligned__(16)));
  11
  12 /* short->int->int dot product.
  13    Detected as a dot-product pattern.
  14    Vectorized on targets that support dot-product for signed shorts.  */
  15
  16 __attribute__ ((noinline)) int
  17 foo (int len)
  18 {
  19   int i;
  20   int result = 0;
  21
  22   for (i = 0; i < len; i++)
  23     {
  24       result += (X[i] * Y[i]);
  25     }
  26   return result;
  27 }
  28
  29
  30 int
  31 main (void)
  32 {
  33   int i;
  34   int dot;
  35
  36   check_vect ();
  37
  38   for (i = 0; i < N; i++)
  39     {
  40       X[i] = i;
  41       Y[i] = N - i;
  42     }
  43
  44   dot = foo (N);
  45   if (dot != DOT)
  46     abort ();
  47
  48   return 0;
  49 }
  50
  51 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" } } */
  52 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_sdot_hi } } } */
  53 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_mult_hi_to_si } } } */
  54 /* { dg-final { cleanup-tree-dump "vect" } } */
  55