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fix subtraction

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-12-27 15:49:54 -08:00
parent dd07d21f6c
commit 1e99059a5d
3 changed files with 37 additions and 33 deletions
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18
src/test/pdd_grobner.cpp
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@ -28,21 +28,23 @@ namespace dd {
grobner gb(lim, m);
gb.add(v1*v2 + v1*v3);
gb.add(v1 - 1);
print_eqs(gb.equations());
gb.display(std::cout);
gb.saturate();
print_eqs(gb.equations());
gb.display(std::cout);
gb.reset();
gb.add(v1*v1*v2 + v2*v3);
gb.add(v1*v1*v2 + v2*v1);
gb.display(std::cout);
gb.saturate();
print_eqs(gb.equations());
gb.display(std::cout);
gb.reset();
gb.add(v1*v1*v2 + v2*v1);
gb.add(v1*v1*v2 + v2*v1);
gb.display(std::cout);
gb.saturate();
print_eqs(gb.equations());
gb.display(std::cout);
gb.reset();
// stop early on contradiction
@ -52,7 +54,7 @@ namespace dd {
gb.add(v3*v1 + v1*v2 + v2*v3 + v1);
gb.add(v3*v1 + v1*v2 + v2*v3 + v2);
gb.saturate();
print_eqs(gb.equations());
gb.display(std::cout << "early contradiction\n");
gb.reset();
// result is v1 = 0, v2 = 0.
@ -61,15 +63,15 @@ namespace dd {
gb.add(v3*v1 + v1*v2 + v2*v3 + v1);
gb.add(v3*v1 + v1*v2 + v2*v3 + v2);
gb.saturate();
print_eqs(gb.equations());
gb.display(std::cout << "v1 = v2 = 0\n");
gb.reset();
// everything rewrites to a multiple of v0
gb.add(v3 - 2*v2);
gb.add(v2 - 2*v1);
gb.add(v1 - 2*v0);
gb.saturate();
print_eqs(gb.equations());
gb.saturate();
gb.display(std::cout << "multiple of v0\n");
gb.reset();
//