gcc/testsuite/gcc.dg/vect/vect-strided-u16-i4.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 128
   7
   8 typedef struct {
   9    unsigned short a;
  10    unsigned short b;
  11    unsigned short c;
  12    unsigned short d;
  13 } s;
  14
  15 volatile int y = 0;
  16
  17 __attribute__ ((noinline)) int
  18 main1 (s *arr)
  19 {
  20   int i;
  21   s *ptr = arr;
  22   s res[N];
  23   unsigned short x, y, z, w;
  24
  25   for (i = 0; i < N; i++)
  26     {
  27       x = ptr->b - ptr->a;
  28       y = ptr->d - ptr->c;
  29       res[i].c = x + y;
  30       z =  ptr->a + ptr->c;
  31       w = ptr->b + ptr->d;
  32       res[i].a = z + w;
  33       res[i].d = x + y;
  34       res[i].b = x + y;
  35       ptr++;
  36     }
  37
  38   /* check results:  */
  39   for (i = 0; i < N; i++)
  40     {
  41       if (res[i].c != arr[i].b - arr[i].a + arr[i].d - arr[i].c
  42           || res[i].a != arr[i].a + arr[i].c + arr[i].b + arr[i].d
  43           || res[i].d != arr[i].b - arr[i].a + arr[i].d - arr[i].c
  44           || res[i].b != arr[i].b - arr[i].a + arr[i].d - arr[i].c)
  45         abort ();
  46     }
  47
  48   return 0;
  49 }
  50
  51 int main (void)
  52 {
  53   int i;
  54   s arr[N];
  55
  56   check_vect ();
  57
  58   for (i = 0; i < N; i++)
  59     {
  60       arr[i].a = i;
  61       arr[i].b = i * 2;
  62       arr[i].c = 17;
  63       arr[i].d = i+34;
  64       if (y) /* Avoid vectorization.  */
  65         abort ();
  66     }
  67
  68   main1 (arr);
  69
  70   return 0;
  71 }
  72
  73 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect"  { target vect_strided4 } } } */
  74