extern void *memset(void *s, int c, __SIZE_TYPE__ n); extern void abort (void); #define ASIZE 1028 #define HALF (ASIZE/2) int main() { unsigned int array[ASIZE]; int i; memset(array, 0, sizeof(array)); /* initialize first half of the array */ for (i = 0; i < HALF; i++) array[i] = i; /* fill second half of array in by summing earlier elements of the array gcc 4.5.1 and 4.5.2 incorrectly vectorize this loop! aray[1025] is left at 0 for ASIZE=1028 */ for (i = 0; i < HALF-1; i++) array[HALF+i] = array[2*i] + array[2*i + 1]; /* see if we have any failures */ for (i = 0; i < HALF - 1; i++) if (array[HALF+i] != array[2*i] + array[2*i + 1]) abort (); return 0; } /* { dg-final { cleanup-tree-dump "vect" } } */