gcc/testsuite/gcc.dg/vect/vect-iv-6.c

   1 /* { dg-require-effective-target vect_int_mult } */
   2 #include <stdarg.h>
   3 #include "tree-vect.h"
   4
   5 #define N 16
   6
   7 __attribute__ ((noinline)) int main1 (int X)
   8 {
   9   int arr1[N+1];
  10   int arr2[N+1];
  11   int k = X;
  12   int m, i=0;
  13
  14    /* Vectorization of induction with non-constant initial condition X.
  15       Also we have here two uses of the induction-variable k as defined
  16       by the loop-header phi (as opposed to the other uses of k that are
  17       defined in the loop), in which case we exercise the fact that we
  18       reuse the same vector def-use-cycle for both uses.
  19       Peeling to align the store is also applied. This peeling also aligns
  20       the load (as they have the same misalignment).  */
  21
  22    do {
  23         arr2[i+1] = 2*k;
  24         k = k + 2;
  25         arr1[i+1] = k;
  26         k = k + 4;
  27         i++;
  28    } while (i < N);
  29
  30   /* check results:  */
  31   for (i = 0; i < N; i++)
  32     {
  33       if (arr1[i+1] != X+6*i+2
  34           || arr2[i+1] != 2*(X+6*i))
  35         abort ();
  36     }
  37
  38   return 0;
  39 }
  40
  41 int main (void)
  42 {
  43   check_vect ();
  44
  45   return main1 (3);
  46 }
  47
  48 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */