llvm/polly/lib/External/isl/test_inputs/codegen/cloog/nul_basic2.c

for (int c0 = 2; c0 <= n; c0 += 2) {
  if (c0 % 4 == 0)
    S2(c0, c0 / 4);
  S1(c0, c0 / 2);
}