gcc/testsuite/gcc.dg/vect/vect-widen-mult-sum.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 SUM 0
   8
   9 /* Require widening-mult or data-unpacking (for the type promotion).  */
  10 __attribute__ ((noinline)) int
  11 main1 (short *in, int off, short scale, int n)
  12 {
  13  int i;
  14  int sum = 0;
  15
  16  for (i = 0; i < n; i++) {
  17    sum += ((int) in[i] * (int) in[i+off]) >> scale;
  18  }
  19
  20  return sum;
  21 }
  22
  23 int main (void)
  24 {
  25   int i;
  26   int sum;
  27   short X[N];
  28
  29   check_vect ();
  30
  31   for (i=0; i<N; i++) {
  32     X[i] = 16-i;
  33   }
  34
  35   sum = main1 (X, 1, 16, N-1);
  36
  37   if (sum != SUM)
  38     abort ();
  39
  40   return 0;
  41 }
  42
  43
  44 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_mult_hi_to_si } } } */
  45 /* { dg-final { scan-tree-dump-times "vect_recog_widen_mult_pattern: detected" 1 "vect" } } */
  46 /* { dg-final { cleanup-tree-dump "vect" } } */