gcc/testsuite/gcc.dg/vect/vect-reduc-dot-s8c.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 DOT3 43680
   9
  10 signed char X[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  11 signed char Y[N] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  12
  13 /* char->int->int dot product.
  14    Not detected as a dot-product pattern.  */
  15 __attribute__ ((noinline)) int
  16 foo3(int len) {
  17   int i;
  18   int result = 0;
  19
  20   for (i=0; i<len; i++) {
  21     result += (X[i] * Y[i]);
  22   }
  23   return result;
  24 }
  25
  26 int main (void)
  27 {
  28   int i, dot3;
  29
  30   check_vect ();
  31
  32   for (i=0; i<N; i++) {
  33     X[i] = i;
  34     Y[i] = 64-i;
  35     __asm__ volatile ("");
  36   }
  37
  38   dot3 = foo3 (N);
  39   if (dot3 != DOT3)
  40     abort ();
  41
  42   return 0;
  43 }
  44
  45 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_unpack } } } */