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Bugfix for equality rewriting on floats.

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Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>
This commit is contained in:
Christoph M. Wintersteiger 2013-10-10 15:38:54 +01:00
parent 9a9f8bbb34
commit 65a202873f
1 changed files with 5 additions and 1 deletions
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6
src/ast/rewriter/float_rewriter.cpp
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@ -490,7 +490,11 @@ br_status float_rewriter::mk_is_sign_minus(expr * arg1, expr_ref & result) {
br_status float_rewriter::mk_eq_core(expr * arg1, expr * arg2, expr_ref & result) {
scoped_mpf v1(m_util.fm()), v2(m_util.fm());
if (m_util.is_value(arg1, v1) && m_util.is_value(arg2, v2)) {
result = (v1 == v2) ? m().mk_true() : m().mk_false();
// Note: == is the floats-equality, here we need normal equality.
result = (m_fm.is_nan(v1) && m_fm.is_nan(v2)) ? m().mk_true() :
(m_fm.is_zero(v1) && m_fm.is_zero(v2) && m_fm.sgn(v1)!=m_fm.sgn(v2)) ? m().mk_false() :
(v1 == v2) ? m().mk_true() :
m().mk_false();
return BR_DONE;
}