gcc/testsuite/gcc.dg/tree-ssa/peel1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -fno-tree-vectorize -fdump-tree-cunroll-details" } */
   3 struct foo {int b; int a[3];} foo;
   4 void add(struct foo *a,int l)
   5 {
   6   int i;
   7   for (i=0;i<l;i++)
   8     a->a[i]++;
   9 }
  10 /* { dg-final { scan-tree-dump "Loop 1 likely iterates at most 3 times." "cunroll"} } */
  11 /* { dg-final { scan-tree-dump "Peeled loop 1, 4 times." "cunroll"} } */