gcc/testsuite/gcc.dg/vect/vect-strided-a-mult.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 } s;
  12
  13 typedef struct {
  14    unsigned int a;
  15    unsigned int b;
  16 } ii;
  17
  18 __attribute__ ((noinline)) int
  19 main1 ()
  20 {
  21   s arr[N];
  22   s *ptr = arr;
  23   ii iarr[N];
  24   ii *iptr = iarr;
  25   s res[N];
  26   ii ires[N];
  27   int i;
  28
  29   for (i = 0; i < N; i++)
  30     {
  31       arr[i].a = i;
  32       arr[i].b = i * 2;
  33       iarr[i].a = i;
  34       iarr[i].b = i * 3;
  35       asm volatile ("" ::: "memory");
  36     }
  37
  38   for (i = 0; i < N; i++)
  39     {
  40       ires[i].a = iptr->b - iptr->a;
  41       ires[i].b = iptr->b + iptr->a;
  42       res[i].b = ptr->b - ptr->a;
  43       res[i].a = ptr->b + ptr->a;
  44       iptr++;
  45       ptr++;
  46     }
  47
  48   /* check results:  */
  49 #pragma GCC novector
  50   for (i = 0; i < N; i++)
  51     {
  52       if (res[i].b != arr[i].b - arr[i].a
  53           || ires[i].a != iarr[i].b - iarr[i].a
  54           || res[i].a != arr[i].b + arr[i].a
  55           || ires[i].b != iarr[i].b +  iarr[i].a
  56 )
  57         abort ();
  58     }
  59
  60   return 0;
  61 }
  62
  63 int main (void)
  64 {
  65   int i;
  66
  67   check_vect ();
  68
  69   main1 ();
  70
  71   return 0;
  72 }
  73
  74 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect"  { target vect_strided2 } } } */
  75