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Fix bug in fp.round_to_integral #7060

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Dec 15, 2023
Merged

Fix bug in fp.round_to_integral #7060

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8 changes: 7 additions & 1 deletion src/ast/fpa/fpa2bv_converter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2189,7 +2189,13 @@ void fpa2bv_converter::mk_round_to_integral(sort * s, expr_ref & rm, expr_ref &
renorm_delta = m.mk_ite(m_bv_util.mk_ule(zero_e2, sig_lz_capped), sig_lz_capped, zero_e2);
SASSERT(m_bv_util.get_bv_size(renorm_delta) == ebits + 2);
res_exp = m_bv_util.mk_bv_sub(res_exp, renorm_delta);
res_sig = m_bv_util.mk_bv_shl(res_sig, m_bv_util.mk_zero_extend(sbits-ebits-2, renorm_delta));
if (sbits >= ebits+2)
res_sig = m_bv_util.mk_bv_shl(res_sig, m_bv_util.mk_zero_extend(sbits-ebits-2, renorm_delta));
else {
// should not overflow because renorm_delta is logarithmic to the size of the leading zero bits
res_sig = m_bv_util.mk_bv_shl(m_bv_util.mk_zero_extend(ebits+2-sbits, res_sig), renorm_delta);
res_sig = m_bv_util.mk_extract(sbits-1, 0, res_sig);
}
dbg_decouple("fpa2bv_r2i_renorm_delta", renorm_delta);
dbg_decouple("fpa2bv_r2i_sig_lz", sig_lz);
dbg_decouple("fpa2bv_r2i_sig_lz_capped", sig_lz_capped);
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