gcc/testsuite/gcc.dg/Warray-bounds-10.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -Warray-bounds" } */
   3
   4 int f(unsigned len, int buflen)
   5 {
   6   unsigned taillen;
   7   unsigned slen;
   8   unsigned i;
   9   int b[17];            /* needed <= 17 to trigger Warning */
  10   int j = 0;            /* needed to trigger Warning */
  11
  12   b[0] = 0;
  13   taillen= buflen & 7;    /* taillen [0..7] */
  14
  15   if(taillen) {        /* taillen [1..7] */
  16       slen= 8 - taillen;    /* slen    [7..1] */
  17       if (len<slen)        /* needed to trigger Warning  */
  18         slen=len;        /* slen' < slen  */
  19       for(i=0; i<slen; i++) {
  20           j = b[taillen];    /* taillen + slen = [1..7] + [7..1] = 8 */
  21           taillen++;
  22       }
  23   }
  24   return j;
  25 }