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ensure also negative lt are constrained

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-06-30 07:44:06 +03:00
parent 1f0d162b7f
commit 85b0722df0
3 changed files with 25 additions and 4 deletions
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9
src/ast/rewriter/seq_rewriter.cpp
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@ -518,6 +518,10 @@ br_status seq_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
SASSERT(num_args == 2);
st = mk_str_in_regexp(args[0], args[1], result);
break;
case OP_STRING_LE:
SASSERT(num_args == 2);
st = mk_str_le(args[0], args[1], result);
break;
case OP_STRING_CONST:
return BR_FAILED;
case OP_STRING_ITOS:
@ -1237,6 +1241,11 @@ br_status seq_rewriter::mk_seq_suffix(expr* a, expr* b, expr_ref& result) {
return BR_FAILED;
}
br_status seq_rewriter::mk_str_le(expr* a, expr* b, expr_ref& result) {
result = m.mk_not(m_util.str.mk_lex_lt(b, a));
return BR_DONE;
}
br_status seq_rewriter::mk_str_itos(expr* a, expr_ref& result) {
rational r;
if (m_autil.is_numeral(a, r)) {