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fix #2812

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-12-20 17:12:44 -08:00
parent 918846a97e
commit 4389ed0f58
1 changed files with 16 additions and 0 deletions
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16
src/ast/rewriter/bool_rewriter.cpp
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@ -763,6 +763,22 @@ br_status bool_rewriter::mk_distinct_core(unsigned num_args, expr * const * args
return BR_DONE;
}
bool all_diff = true, some_eq = false;
for (unsigned i = 0; all_diff && !some_eq && i < num_args; i++) {
for (unsigned j = i + 1; all_diff && !some_eq && j < num_args; j++) {
all_diff = m().are_distinct(args[i], args[j]);
some_eq = m().are_equal(args[i], args[j]);
}
}
if (all_diff) {
result = m().mk_true();
return BR_DONE;
}
if (some_eq) {
result = m().mk_false();
return BR_DONE;
}
if (m_blast_distinct && num_args < m_blast_distinct_threshold) {
ptr_buffer<expr> new_diseqs;
for (unsigned i = 0; i < num_args; i++) {