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Bugfixes for fp.to_* operators

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This commit is contained in:
Christoph M. Wintersteiger 2017-09-15 19:56:15 +01:00
parent 4267f304a4
commit 05447d612a
4 changed files with 35 additions and 16 deletions
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20
src/ast/fpa/fpa2bv_converter.cpp
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@ -3312,11 +3312,11 @@ void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args
expr_ref big_sig_shifted(m), int_part(m), last(m), round(m), stickies(m), sticky(m);
big_sig_shifted = m.mk_ite(is_neg_shift, m_bv_util.mk_bv_lshr(big_sig, shift),
m_bv_util.mk_bv_shl(big_sig, shift));
int_part = m_bv_util.mk_extract(big_sig_sz-1, big_sig_sz-bv_sz-3, big_sig_shifted);
int_part = m_bv_util.mk_extract(big_sig_sz-1, big_sig_sz-(bv_sz+3), big_sig_shifted);
SASSERT(m_bv_util.get_bv_size(int_part) == bv_sz+3);
last = m_bv_util.mk_extract(big_sig_sz-bv_sz-4, big_sig_sz-bv_sz-4, big_sig_shifted);
round = m_bv_util.mk_extract(big_sig_sz-bv_sz-5, big_sig_sz-bv_sz-5, big_sig_shifted);
stickies = m_bv_util.mk_extract(big_sig_sz-bv_sz-6, 0, big_sig_shifted);
last = m_bv_util.mk_extract(big_sig_sz-(bv_sz+3), big_sig_sz-(bv_sz+3), big_sig_shifted);
round = m_bv_util.mk_extract(big_sig_sz-(bv_sz+4), big_sig_sz-(bv_sz+4), big_sig_shifted);
stickies = m_bv_util.mk_extract(big_sig_sz-(bv_sz+5), 0, big_sig_shifted);
sticky = m.mk_app(m_bv_util.get_fid(), OP_BREDOR, stickies);
dbg_decouple("fpa2bv_to_bv_big_sig_shifted", big_sig_shifted);
dbg_decouple("fpa2bv_to_bv_int_part", int_part);
@ -3335,25 +3335,25 @@ 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);
expr_ref out_of_range(m);
expr_ref in_range(m);
if (!is_signed) {
expr_ref ul(m);
ul = m_bv_util.mk_zero_extend(3, m_bv_util.mk_concat(bv1, m_bv_util.mk_numeral(0, bv_sz-1)));
out_of_range = m_bv_util.mk_ule(ul, pre_rounded);
ul = m_bv_util.mk_zero_extend(3, m_bv_util.mk_numeral(-1, bv_sz));
in_range = m_bv_util.mk_ule(pre_rounded, ul);
}
else {
expr_ref ll(m), ul(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));
out_of_range = m.mk_not(m.mk_and(m_bv_util.mk_sle(ll, pre_rounded), m_bv_util.mk_sle(pre_rounded, ul)));
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_out_of_range", out_of_range);
dbg_decouple("fpa2bv_to_bv_in_range", in_range);
expr_ref rounded(m);
rounded = m_bv_util.mk_extract(bv_sz-1, 0, pre_rounded);
dbg_decouple("fpa2bv_to_bv_rounded", rounded);
result = m.mk_ite(out_of_range, unspec_v, rounded);
result = m.mk_ite(m.mk_not(in_range), unspec_v, rounded);
result = m.mk_ite(c2, v2, result);
result = m.mk_ite(c1, v1, result);