X-Git-Url: https://scm.cri.ensmp.fr/git/linpy.git/blobdiff_plain/454a26a54cc7ff563ab278567f3bbad9c6ff42bb..e9edace5958076df71291b81a03c04f545392afd:/examples/nsad2010.py diff --git a/examples/nsad2010.py b/examples/nsad2010.py index 9359315..4b73eef 100755 --- a/examples/nsad2010.py +++ b/examples/nsad2010.py @@ -1,5 +1,13 @@ #!/usr/bin/env python3 +# This is an implementation of the algorithm described in +# +# [ACI10] C. Ancourt, F. Coelho and F. Irigoin, A modular static analysis +# approach to affine loop invariants detection (2010), pp. 3 - 16, NSAD 2010. +# +# to compute the transitive closure of an affine transformer. A refined version +# of this algorithm is implemented in PIPS. + from linpy import * @@ -39,8 +47,8 @@ class Transformer: if __name__ == '__main__': - i, iprime, j, jprime = symbols("i i' j j'") - transformer = Transformer(Eq(iprime, i + 2) & Eq(jprime, j + 1), - [i, j], [iprime, jprime]) + i0, i, j0, j = symbols('i0 i j0 j') + transformer = Transformer(Eq(i, i0 + 2) & Eq(j, j0 + 1), + [i0, j0], [i, j]) print('T =', transformer.polyhedron) print('T* =', transformer.star().polyhedron)