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add rewriting option to simplify store equalities

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2013-05-13 11:43:30 -07:00
parent 5eed106ffe
commit e35fd58968
5 changed files with 47 additions and 1 deletions
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38
src/ast/rewriter/array_rewriter.cpp
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@ -25,6 +25,7 @@ void array_rewriter::updt_params(params_ref const & _p) {
array_rewriter_params p(_p);
m_sort_store = p.sort_store();
m_expand_select_store = p.expand_select_store();
m_expand_store_eq = p.expand_store_eq();
}
void array_rewriter::get_param_descrs(param_descrs & r) {
@ -365,3 +366,40 @@ br_status array_rewriter::mk_set_subset(expr * arg1, expr * arg2, expr_ref & res
return BR_REWRITE3;
}
br_status array_rewriter::mk_eq_core(expr * lhs, expr * rhs, expr_ref & result) {
if (!m_expand_store_eq) {
return BR_FAILED;
}
expr* lhs1 = lhs;
while (m_util.is_store(lhs1)) {
lhs1 = to_app(lhs1)->get_arg(0);
}
expr* rhs1 = rhs;
while (m_util.is_store(rhs1)) {
rhs1 = to_app(rhs1)->get_arg(0);
}
if (lhs1 != rhs1) {
return BR_FAILED;
}
ptr_buffer<expr> fmls, args;
expr* e;
expr_ref tmp1(m()), tmp2(m());
#define MK_EQ() \
while (m_util.is_store(e)) { \
args.push_back(lhs); \
args.append(to_app(e)->get_num_args()-2,to_app(e)->get_args()+1); \
mk_select(args.size(), args.c_ptr(), tmp1); \
args[0] = rhs; \
mk_select(args.size(), args.c_ptr(), tmp2); \
fmls.push_back(m().mk_eq(tmp1, tmp2)); \
e = to_app(e)->get_arg(0); \
args.reset(); \
} \
e = lhs;
MK_EQ();
e = rhs;
MK_EQ();
result = m().mk_and(fmls.size(), fmls.c_ptr());
return BR_REWRITE_FULL;
}