llvm/polly/lib/External/isl/test_inputs/codegen/cloog/dot2.c

for (int c0 = 1; c0 <= min(M, N); c0 += 1) {
  S1(c0);
  for (int c1 = 1; c1 <= M; c1 += 1)
    S2(c0, c1);
}
for (int c0 = N + 1; c0 <= M; c0 += 1)
  S1(c0);
for (int c0 = M + 1; c0 <= N; c0 += 1)
  for (int c1 = 1; c1 <= M; c1 += 1)
    S2(c0, c1);