gcc/testsuite/gcc.dg/vect/pr65947-11.c

   1 /* { dg-require-effective-target vect_condition } */
   2
   3 #include "tree-vect.h"
   4
   5 extern void abort (void) __attribute__ ((noreturn));
   6
   7 #define N 37
   8
   9 /* Re-use the result of the condition inside the loop.  Will fail to
  10    vectorize.  */
  11
  12 unsigned int
  13 condition_reduction (unsigned int *a, unsigned int min_v, unsigned int *b)
  14 {
  15   unsigned int last = N + 65;
  16
  17   for (unsigned int i = 0; i < N; i++)
  18     {
  19       if (b[i] < min_v)
  20         last = i;
  21       a[i] = last;
  22     }
  23   return last;
  24 }
  25
  26 int
  27 main (void)
  28 {
  29   unsigned int a[N] = {
  30   31, 32, 33, 34, 35, 36, 37,
  31   1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
  32   21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
  33   11, 12, 13, 14, 15, 16, 17, 18, 19, 20
  34   };
  35   unsigned int b[N] = {
  36   11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
  37   21, 22, 23, 24, 25, 26, 27, 28, 29, 30,
  38   1, 2, 3, 4, 5, 6, 7, 8, 9, 10,
  39   31, 32, 33, 34, 35, 36, 37
  40   };
  41
  42   check_vect ();
  43
  44   unsigned int ret = condition_reduction (a, 16, b);
  45
  46   if (ret != 29)
  47     abort ();
  48
  49   return 0;
  50 }
  51
  52 /* { dg-final { scan-tree-dump-not "LOOP VECTORIZED" "vect" } } */