llvm/polly/lib/External/isl/test_inputs/convex9.polylib

4 4
1 1 0 0
1 -1 0 1
1 0 1 0
1 0 -1 10

2 4
1 1 0 -10
0 0 -1 5

3 4
1 1 0 0
1 0 1 0
1 0 -1 10