1for (int c0 = 1; c0 < M; c0 += 1)
2 for (int c1 = c0 + 1; c1 <= M; c1 += 1) {
3 for (int c3 = 1; c3 < c0; c3 += 1)
4 S1(c0, c3, c1);
5 for (int c3 = c0 + 1; c3 <= M; c3 += 1)
6 S2(c0, c3, c1);
7 }
8

source code of polly/lib/External/isl/test_inputs/codegen/cloog/gauss.c