gcc/testsuite/gcc.dg/pr33742.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-vectorize" } */
   3
   4 typedef unsigned short ush;
   5 extern ush prev[];
   6
   7 void fill_window ()
   8 {
   9   register unsigned n, m;
  10
  11   for (n = 0; n < 32768; n++)
  12     {
  13       m = prev[n];
  14       prev[n] = (ush) (m >= 0x8000 ? m - 0x8000 : 0);
  15     }
  16 }