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fix #3235 - return early during lookaehad, avoid checking invariant when context is inconsistent

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-03-11 10:55:56 -07:00
parent 59acd1093d
commit 36cddd0c46
3 changed files with 24 additions and 17 deletions
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8
src/smt/smt_lookahead.cpp
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@ -82,7 +82,10 @@ namespace smt {
unsigned nf = 0, nc = 0, ns = 0, bound = 2000, n = 0;
for (bool_var v : vars) {
if (!ctx.bool_var2expr(v)) continue;
literal lit(v, false);
literal lit(v, false);
ctx.propagate();
if (ctx.inconsistent())
return expr_ref(m.mk_false(), m);
ctx.push_scope();
ctx.assign(lit, b_justification::mk_axiom(), true);
ctx.propagate();
@ -96,6 +99,9 @@ namespace smt {
continue;
}
ctx.propagate();
if (ctx.inconsistent())
return expr_ref(m.mk_false(), m);
ctx.push_scope();
ctx.assign(~lit, b_justification::mk_axiom(), true);
ctx.propagate();