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simplify ""* to ""

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This commit is contained in:
Nikolaj Bjorner 2021-03-29 14:18:57 -07:00
parent 6d28b1a858
commit 5cc29bec14
1 changed files with 4 additions and 0 deletions
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4
src/ast/rewriter/seq_rewriter.cpp
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@ -4094,6 +4094,10 @@ br_status seq_rewriter::mk_re_star(expr* a, expr_ref& result) {
result = re().mk_to_re(str().mk_empty(seq_sort)); result = re().mk_to_re(str().mk_empty(seq_sort));
return BR_DONE; return BR_DONE;
} }
if (re().is_to_re(a, b) && str().is_empty(b)) {
result = a;
return BR_DONE;
}
if (re().is_plus(a, b)) { if (re().is_plus(a, b)) {
result = re().mk_star(b); result = re().mk_star(b);
return BR_DONE; return BR_DONE;