gcc/testsuite/gcc.dg/vect/pr48172.c

   1 #include "tree-vect.h"
   2
   3 extern void *memset(void *s, int c, __SIZE_TYPE__ n);
   4 extern void abort (void);
   5
   6 #define ASIZE 1028
   7 #define HALF (ASIZE/2)
   8
   9 int main() {
  10   unsigned int array[ASIZE];
  11   int i;
  12
  13   check_vect ();
  14
  15   memset(array, 0, sizeof(array));
  16
  17   /* initialize first half of the array */
  18   for (i = 0; i < HALF; i++)
  19     array[i] = i;
  20
  21   /* fill second half of array in by summing earlier elements of the array
  22      gcc 4.5.1 and 4.5.2 incorrectly vectorize this loop!  aray[1025] is left
  23      at 0 for ASIZE=1028 */
  24   for (i = 0; i < HALF-1; i++)
  25     array[HALF+i] = array[2*i] + array[2*i + 1];
  26
  27   /* see if we have any failures */
  28 #pragma GCC novector
  29   for (i = 0; i < HALF - 1; i++)
  30     if (array[HALF+i] != array[2*i] + array[2*i + 1])
  31       abort ();
  32
  33   return 0;
  34 }
  35