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array rewriter: expand select of store with const array into an ite

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This:
(simplify (select (store ((as const (Array (_ BitVec 4) (_ BitVec 4))) #x0) x #x1) y))
=>
(ite (= x y) #x1 #x0)
This commit is contained in:
Nuno Lopes 2023-01-03 11:08:57 +00:00
parent e508ef17f6
commit e448191212
1 changed files with 5 additions and 2 deletions
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7
src/ast/rewriter/array_rewriter.cpp
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@ -228,14 +228,17 @@ br_status array_rewriter::mk_select_core(unsigned num_args, expr * const * args,
} }
return true; return true;
}; };
expr *array = to_app(args[0])->get_arg(0);
bool is_leaf = m_util.is_const(array);
bool should_expand = bool should_expand =
m_blast_select_store || m_blast_select_store ||
is_leaf ||
are_values() || are_values() ||
(m_expand_select_store && to_app(args[0])->get_arg(0)->get_ref_count() == 1); (m_expand_select_store && array->get_ref_count() == 1);
if (should_expand) { if (should_expand) {
// select(store(a, I, v), J) --> ite(I=J, v, select(a, J)) // select(store(a, I, v), J) --> ite(I=J, v, select(a, J))
ptr_buffer<expr> new_args; ptr_buffer<expr> new_args;
new_args.push_back(to_app(args[0])->get_arg(0)); new_args.push_back(array);
new_args.append(num_args-1, args+1); new_args.append(num_args-1, args+1);
expr * sel_a_j = m().mk_app(get_fid(), OP_SELECT, num_args, new_args.data()); expr * sel_a_j = m().mk_app(get_fid(), OP_SELECT, num_args, new_args.data());
expr * v = to_app(args[0])->get_arg(num_args); expr * v = to_app(args[0])->get_arg(num_args);