gcc/testsuite/gcc.dg/tree-ssa/pr64183.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -fno-tree-vectorize -fdisable-tree-sccp -fdump-tree-cunroll-details" } */
   3
   4 int bits;
   5 unsigned int size;
   6 int max_code;
   7
   8 void
   9 test ()
  10 {
  11  int code = 0;
  12
  13  while (code < max_code)
  14    code |= ((unsigned int) (size >> (--bits)));
  15
  16  while (bits < (unsigned int)25)
  17    bits += 8;
  18 }
  19
  20 /* { dg-final { scan-tree-dump "Loop 2 iterates at most 3 times" "cunroll"} } */