gcc-4.9/gcc/testsuite/gcc.dg/unroll_1.c


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/* { dg-do compile } */
/* { dg-options "-O2 -fdump-rtl-loop2_unroll=stderr -fno-peel-loops -fno-tree-vrp -fdisable-tree-cunroll -fdisable-tree-cunrolli -fenable-rtl-loop2 -fenable-rtl-loop2_unroll" } */

unsigned a[100], b[100];
inline void bar()
{
 a[10] = b[10];
}

int foo(void)
{
  int i;
  bar();
  for (i = 0; i < 2; i++) /* { dg-message "note: loop turned into non-loop; it never loops" } */
  {
     a[i]= b[i] + 1;
  }
  return 1;
}

int foo2(void)
{
  int i;
  for (i = 0; i < 2; i++) /* { dg-message "note: loop turned into non-loop; it never loops" } */
  {
     a[i]= b[i] + 1;
  }
  return 1;
}
/* { dg-prune-output ".*" } */