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Merge pull request #552 from MikolasJanota/bug_fix

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Avoiding adding spurious +0 in poly_rewriter::cancel_monomials.
This commit is contained in:
Christoph M. Wintersteiger 2016-04-05 19:06:19 +01:00
parent c454b81b2c 05ce886afe
commit efd923b826
1 changed files with 10 additions and 8 deletions
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18
src/ast/rewriter/poly_rewriter_def.h
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@ -825,15 +825,17 @@ br_status poly_rewriter<Config>::cancel_monomials(expr * lhs, expr * rhs, bool m
if (c_at_rhs) {
c.neg();
normalize(c);
new_rhs_monomials[0] = mk_numeral(c);
lhs_result = mk_add_app(new_lhs_monomials.size() - 1, new_lhs_monomials.c_ptr() + 1);
rhs_result = mk_add_app(new_rhs_monomials.size(), new_rhs_monomials.c_ptr());
}
else {
new_lhs_monomials[0] = mk_numeral(c);
lhs_result = mk_add_app(new_lhs_monomials.size(), new_lhs_monomials.c_ptr());
rhs_result = mk_add_app(new_rhs_monomials.size() - 1, new_rhs_monomials.c_ptr() + 1);
}
// When recreating the lhs and rhs also insert coefficient on the appropriate side.
// Ignore coefficient if it's 0 and there are no other summands.
const bool insert_c_lhs = !c_at_rhs && (new_lhs_monomials.size() == 1 || !c.is_zero());
const bool insert_c_rhs = c_at_rhs && (new_rhs_monomials.size() == 1 || !c.is_zero());
const unsigned lhs_offset = insert_c_lhs ? 0 : 1;
const unsigned rhs_offset = insert_c_rhs ? 0 : 1;
new_rhs_monomials[0] = insert_c_rhs ? mk_numeral(c) : NULL;
new_lhs_monomials[0] = insert_c_lhs ? mk_numeral(c) : NULL;
lhs_result = mk_add_app(new_lhs_monomials.size() - lhs_offset, new_lhs_monomials.c_ptr() + lhs_offset);
rhs_result = mk_add_app(new_rhs_monomials.size() - rhs_offset, new_rhs_monomials.c_ptr() + rhs_offset);
return BR_DONE;
}