gcc/testsuite/gcc.dg/vect/wrapv-vect-reduc-pattern-2c.c

   1 /* { dg-additional-options "-fwrapv" } */
   2 /* { dg-require-effective-target vect_int } */
   3
   4 #include <stdarg.h>
   5 #include "tree-vect.h"
   6
   7 #define N 16
   8 signed char data_ch[N] =
   9   { 0, 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 };
  10 #define SUM 210
  11
  12 __attribute__ ((noinline)) int
  13 foo ()
  14 {
  15   int i;
  16   signed short shortsum = 0;
  17
  18   /* widenning sum: sum chars into short.  */
  19
  20   for (i = 0; i < N; i++)
  21     {
  22       shortsum += data_ch[i];
  23     }
  24
  25   /* check results:  */
  26   if (shortsum != SUM)
  27     abort ();
  28
  29   return 0;
  30 }
  31
  32 int
  33 main (void)
  34 {
  35   check_vect ();
  36   return foo ();
  37 }
  38
  39 /* { dg-final { scan-tree-dump "vect_recog_widen_sum_pattern: detected" "vect" } } */
  40 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { target vect_widen_sum_qi_to_hi } } } */
  41 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 0 "vect" { target { ! vect_widen_sum_qi_to_hi } } } } */