gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s16b.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 64
   7
   8 #define DOT 43680
   9
  10 signed short X[N] __attribute__ ((__aligned__(16)));
  11 signed short Y[N] __attribute__ ((__aligned__(16)));
  12
  13 /* short->short->int dot product.  Should be vectorized on architectures
  14    supporting vectorized multiplication of two short args with short result,
  15    e.g "mulv4hi3" and widenning sum */
  16 __attribute__ ((noinline)) int
  17 foo (int len)
  18 {
  19   int i;
  20   int result = 0;
  21   short prod;
  22
  23   for (i = 0; i < len; i++)
  24     {
  25       prod = X[i] * Y[i];
  26       result += prod;
  27     }
  28   return result;
  29 }
  30
  31 int
  32 main (void)
  33 {
  34   int i, dot;
  35
  36   check_vect ();
  37
  38   for (i = 0; i < N; i++)
  39     {
  40       X[i] = i;
  41       Y[i] = 64 - 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 "vectorized 1 loops" 1 "vect" { target { vect_short_mult && vect_widen_sum_hi_to_si } } } } */
  52 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 0 "vect" { target { ! vect_short_mult } } } } */
  53 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 0 "vect" { target { ! vect_widen_sum_hi_to_si } } } } */
  54
  55 /* { dg-final { cleanup-tree-dump "vect" } } */
  56