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Fixed overflow problem in fp.to_?bv. Thanks to Florian Schanda for reporting this bug.

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This commit is contained in:
Christoph M. Wintersteiger 2018-04-05 15:26:25 +01:00
parent 793642f48d
commit 328ad248b6
1 changed files with 7 additions and 5 deletions
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12
src/ast/fpa/fpa2bv_converter.cpp
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@ -3241,18 +3241,20 @@ void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args
dbg_decouple("fpa2bv_to_bv_inc", inc);
dbg_decouple("fpa2bv_to_bv_pre_rounded", pre_rounded);
pre_rounded = m.mk_ite(x_is_neg, m_bv_util.mk_bv_neg(pre_rounded), pre_rounded);
expr_ref ll(m), ul(m), in_range(m);
expr_ref ul(m), ovfl(m), in_range(m);
if (!is_signed) {
ll = m_bv_util.mk_numeral(0, bv_sz+3);
ul = m_bv_util.mk_zero_extend(3, m_bv_util.mk_numeral(-1, bv_sz));
in_range = m.mk_and(m.mk_not(x_is_neg), m_bv_util.mk_ule(pre_rounded, ul));
}
else {
expr_ref ll(m);
ll = m_bv_util.mk_sign_extend(3, m_bv_util.mk_concat(bv1, m_bv_util.mk_numeral(0, bv_sz-1)));
ul = m_bv_util.mk_zero_extend(4, m_bv_util.mk_numeral(-1, bv_sz-1));
pre_rounded = m.mk_ite(x_is_neg, m_bv_util.mk_bv_neg(pre_rounded), pre_rounded);
in_range = m.mk_and(m.mk_not(ovfl), m_bv_util.mk_sle(ll, pre_rounded), m_bv_util.mk_sle(pre_rounded, ul));
dbg_decouple("fpa2bv_to_bv_in_range_ll", ll);
}
in_range = m.mk_and(m_bv_util.mk_sle(ll, pre_rounded), m_bv_util.mk_sle(pre_rounded, ul));
dbg_decouple("fpa2bv_to_bv_in_range_ul", ul);
dbg_decouple("fpa2bv_to_bv_in_range", in_range);
expr_ref rounded(m);