gcc/testsuite/gcc.dg/vect/vect-reduc-dot-u16a.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 DOT1 43680
   9 #define DOT2 43680
  10
  11 unsigned short X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  12 unsigned short Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  13
  14 /* short->short->int dot product.
  15    Not detected as a dot-product pattern.
  16    Requires support for non-widneing multiplication and widening-summation.  */
  17 __attribute__ ((noinline)) unsigned int
  18 foo1(int len) {
  19   int i;
  20   unsigned int result = 0;
  21   unsigned short prod;
  22
  23   for (i=0; i<len; i++) {
  24     prod = X[i] * Y[i];
  25     result += prod;
  26   }
  27   return result;
  28 }
  29
  30 int main (void)
  31 {
  32   unsigned int dot1;
  33   unsigned short i;
  34
  35   check_vect ();
  36
  37   for (i=0; i<N; i++) {
  38     X[i] = i;
  39     Y[i] = 64-i;
  40   }
  41
  42   dot1 = foo1 (N);
  43   if (dot1 != DOT1)
  44     abort ();
  45
  46   return 0;
  47 }
  48
  49 /* The initialization loop in main also gets vectorized.  */
  50 /* { dg-final { scan-tree-dump-times "vect_recog_dot_prod_pattern: detected" 1 "vect" { xfail *-*-* } } } */
  51 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 2 "vect" { target { vect_short_mult && vect_widen_sum_hi_to_si } } } } */