llvm/polly/lib/External/isl/test_inputs/codegen/cloog/forwardsub-3-1-2.c

S3(2, 1);
S1(3, 1);
for (int c0 = 4; c0 <= M + 1; c0 += 1) {
  S1(c0, 1);
  for (int c1 = 2; c1 < (c0 + 1) / 2; c1 += 1)
    S2(c0, c1);
  if (c0 % 2 == 0)
    S4(c0, c0 / 2);
}
for (int c0 = M + 2; c0 <= 2 * M; c0 += 1) {
  for (int c1 = -M + c0; c1 < (c0 + 1) / 2; c1 += 1)
    S2(c0, c1);
  if (c0 % 2 == 0)
    S4(c0, c0 / 2);
}