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fix #2238

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-05-08 10:15:57 +02:00
parent 3e059a3a3b
commit f79dccccfe
4 changed files with 36 additions and 17 deletions
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9
src/tactic/arith/purify_arith_tactic.cpp
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@ -401,15 +401,18 @@ struct purify_arith_proc {
return BR_DONE;
bool is_int = u().is_int(args[0]);
expr * x = args[0];
rational xr;
if (u().is_numeral(x, xr) && xr.is_zero())
return BR_FAILED;
expr * k = mk_fresh_var(is_int);
result = k;
mk_def_proof(k, t, result_pr);
cache_result(t, result, result_pr);
expr * x = args[0];
expr * zero = u().mk_numeral(rational(0), is_int);
expr * one = u().mk_numeral(rational(1), is_int);
expr_ref zero(u().mk_numeral(rational(0), is_int), m());
expr_ref one(u().mk_numeral(rational(1), is_int), m());
if (y.is_zero()) {
// (^ x 0) --> k | x != 0 implies k = 1, x = 0 implies k = 0^0
push_cnstr(OR(EQ(x, zero), EQ(k, one)));