gcc/testsuite/gcc.dg/vect/vect-reduc-mul_1.c

   1 /* { dg-require-effective-target vect_int_mult } */
   2 /* { dg-require-effective-target whole_vector_shift } */
   3
   4 /* Write a reduction loop to be reduced using vector shifts.  */
   5
   6 #include "tree-vect.h"
   7
   8 extern void abort(void);
   9
  10 unsigned char in[16];
  11
  12 int
  13 main (unsigned char argc, char **argv)
  14 {
  15   unsigned char i = 0;
  16   unsigned char sum = 1;
  17
  18   check_vect ();
  19
  20   for (i = 0; i < 16; i++)
  21     in[i] = i + i + 1;
  22
  23   /* Prevent constant propagation of the entire loop below.  */
  24   asm volatile ("" : : : "memory");
  25
  26   for (i = 0; i < 16; i++)
  27     sum *= in[i];
  28
  29   if (sum != 33)
  30     {
  31       __builtin_printf("Failed %d\n", sum);
  32       abort();
  33     }
  34
  35   return 0;
  36 }
  37
  38 /* { dg-final { scan-tree-dump "Reduce using vector shifts" "vect" } } */
  39