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purify

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-08-27 11:57:13 -07:00
parent b8a81bcb09
commit 3bfc3437f1
8 changed files with 44 additions and 101 deletions
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15
src/tactic/arith/purify_arith_tactic.cpp
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@ -297,11 +297,11 @@ struct purify_arith_proc {
push_cnstr(OR(EQ(y, mk_real_zero()),
EQ(u().mk_mul(y, k), x)));
push_cnstr_pr(result_pr);
if (complete()) {
rational r;
if (complete() && (!u().is_numeral(y, r) || r.is_zero())) {
// y != 0 \/ k = div-0(x)
push_cnstr(OR(NOT(EQ(y, mk_real_zero())),
EQ(k, u().mk_div0(x))));
EQ(k, u().mk_div(x, mk_real_zero()))));
push_cnstr_pr(result_pr);
}
}
@ -348,11 +348,12 @@ struct purify_arith_proc {
push_cnstr(OR(u().mk_ge(y, zero), u().mk_lt(k2, u().mk_mul(u().mk_numeral(rational(-1), true), y))));
push_cnstr_pr(mod_pr);
if (complete()) {
push_cnstr(OR(NOT(EQ(y, zero)), EQ(k1, u().mk_idiv0(x))));
rational r;
if (complete() && (!u().is_numeral(y, r) || r.is_zero())) {
push_cnstr(OR(NOT(EQ(y, zero)), EQ(k1, u().mk_idiv(x, zero))));
push_cnstr_pr(result_pr);
push_cnstr(OR(NOT(EQ(y, zero)), EQ(k2, u().mk_mod0(x))));
push_cnstr(OR(NOT(EQ(y, zero)), EQ(k2, u().mk_mod(x, zero))));
push_cnstr_pr(mod_pr);
}
}
@ -414,7 +415,7 @@ struct purify_arith_proc {
// (^ x 0) --> k | x != 0 implies k = 1, x = 0 implies k = 0^0
push_cnstr(OR(EQ(x, zero), EQ(k, one)));
push_cnstr_pr(result_pr);
push_cnstr(OR(NOT(EQ(x, zero)), EQ(k, is_int ? u().mk_0_pw_0_int() : u().mk_0_pw_0_real())));
push_cnstr(OR(NOT(EQ(x, zero)), EQ(k, u().mk_power(zero, zero))));
push_cnstr_pr(result_pr);
}
else if (!is_int) {