z3-z3-4.13.0.src.test.expr_substitution.cpp Maven / Gradle / Ivy
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/*++
Copyright (c) 2015 Microsoft Corporation
--*/
#include "ast/expr_substitution.h"
#include "smt/params/smt_params.h"
#include "ast/substitution/substitution.h"
#include "ast/substitution/unifier.h"
#include "ast/bv_decl_plugin.h"
#include "ast/ast_pp.h"
#include "ast/arith_decl_plugin.h"
#include "ast/reg_decl_plugins.h"
#include "ast/rewriter/th_rewriter.h"
#include
expr* mk_bv_xor(bv_util& bv, expr* a, expr* b) {
expr* args[2];
args[0] = a;
args[1] = b;
return bv.mk_bv_xor(2, args);
}
expr* mk_bv_and(bv_util& bv, expr* a, expr* b) {
expr* args[2];
args[0] = a;
args[1] = b;
ast_manager& m = bv.get_manager();
return m.mk_app(bv.get_family_id(), OP_BAND, 2, args);
}
void tst_expr_substitution() {
memory::initialize(0);
ast_manager m;
reg_decl_plugins(m);
bv_util bv(m);
expr_ref a(m), b(m), c(m), d(m);
expr_ref x(m);
expr_ref new_a(m);
proof_ref pr(m);
x = m.mk_const(symbol("x"), bv.mk_sort(8));
a = mk_bv_and(bv, mk_bv_xor(bv, x,bv.mk_numeral(8,8)), mk_bv_xor(bv,x,x));
b = x;
c = bv.mk_bv_sub(x, bv.mk_numeral(4, 8));
expr_substitution subst(m);
th_rewriter rw(m);
std::cout << mk_pp(c, m) << "\n";
// normalizing c does not help.
rw(c, d, pr);
std::cout << mk_pp(d, m) << "\n";
// This portion diverges. It attempts to replace x by (bvadd #xfc x), which contains x.
// subst.insert(b, d);
// std::cout << mk_pp(a, m) << "\n";
// rw.set_substitution(&subst);
// enable_trace("th_rewriter_step");
// rw(a, new_a, pr);
// std::cout << mk_pp(new_a, m) << "\n";
}