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fix issue in #4655

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-08-24 17:45:50 -07:00
parent c722962124
commit 22aee4d08d
5 changed files with 83 additions and 41 deletions
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39
src/test/egraph.cpp
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@ -8,6 +8,7 @@ Copyright (c) 2020 Microsoft Corporation
#include "ast/euf/euf_egraph.h"
#include "ast/reg_decl_plugins.h"
#include "ast/ast_pp.h"
#include "ast/arith_decl_plugin.h"
static expr_ref mk_const(ast_manager& m, char const* name, sort* s) {
return expr_ref(m.mk_const(symbol(name), s), m);
@ -85,13 +86,47 @@ static void test2() {
static void test3() {
ast_manager m;
reg_decl_plugins(m);
arith_util a(m);
euf::egraph g(m);
sort_ref S(m.mk_uninterpreted_sort(symbol("S")), m);
sort_ref I(a.mk_int(), m);
expr_ref zero(a.mk_int(0), m);
expr_ref one(a.mk_int(1), m);
expr_ref x = mk_const(m, "x", I);
expr_ref y = mk_const(m, "y", I);
expr_ref z = mk_const(m, "z", I);
expr_ref u = mk_const(m, "u", I);
expr_ref fx = mk_app("f", x, I);
expr_ref fy = mk_app("f", y, I);
euf::enode* nx = g.mk(x, nullptr);
euf::enode* ny = g.mk(y, nullptr);
euf::enode* nz = g.mk(z, nullptr);
euf::enode* nu = g.mk(u, nullptr);
euf::enode* n0 = g.mk(zero, nullptr);
euf::enode* n1 = g.mk(one, nullptr);
euf::enode* nfx = g.mk(fx, &nx);
euf::enode* nfy = g.mk(fy, &ny);
int justifications[5] = { 1, 2, 3, 4, 5 };
g.merge(nfx, n0, justifications + 0);
g.merge(nfy, n1, justifications + 1);
g.merge(nx, nz, justifications + 2);
g.merge(nx, nu, justifications + 3);
g.propagate();
SASSERT(!g.inconsistent());
g.merge(nx, ny, justifications + 4);
std::cout << g << "\n";
g.propagate();
std::cout << g << "\n";
SASSERT(g.inconsistent());
ptr_vector<int> js;
g.explain<int>(js);
for (int* j : js) {
std::cout << "conflict: " << *j << "\n";
}
}
void tst_egraph() {
enable_trace("euf");
test3();
test1();
test2();
}