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FPA division bugfix

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Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>
This commit is contained in:
Christoph M. Wintersteiger 2014-04-10 19:33:34 +01:00
parent 64bfbb657c
commit 52b54f395b
1 changed files with 12 additions and 1 deletions
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13
src/tactic/fpa/fpa2bv_converter.cpp
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@ -872,8 +872,19 @@ void fpa2bv_converter::mk_div(func_decl * f, unsigned num, expr * const * args,
sticky = m.mk_app(m_bv_util.get_fid(), OP_BREDOR, m_bv_util.mk_extract(extra_bits-2, 0, quotient));
res_sig = m_bv_util.mk_concat(m_bv_util.mk_extract(extra_bits+sbits+1, extra_bits-1, quotient), sticky);
SASSERT(m_bv_util.get_bv_size(res_sig) == (sbits + 4));
SASSERT(m_bv_util.get_bv_size(res_sig) == (sbits + 4));
expr_ref res_sig_lz(m);
mk_leading_zeros(res_sig, sbits + 4, res_sig_lz);
dbg_decouple("fpa2bv_div_res_sig_lz", res_sig_lz);
expr_ref res_sig_shift_amount(m);
res_sig_shift_amount = m_bv_util.mk_bv_sub(res_sig_lz, m_bv_util.mk_numeral(1, sbits + 4));
dbg_decouple("fpa2bv_div_res_sig_shift_amount", res_sig_shift_amount);
expr_ref shift_cond(m);
shift_cond = m_bv_util.mk_ule(res_sig_lz, m_bv_util.mk_numeral(1, sbits + 4));
m_simp.mk_ite(shift_cond, res_sig, m_bv_util.mk_bv_shl(res_sig, res_sig_shift_amount), res_sig);
m_simp.mk_ite(shift_cond, res_exp, m_bv_util.mk_bv_sub(res_exp, m_bv_util.mk_extract(ebits+1, 0, res_sig_shift_amount)), res_exp);
round(f->get_range(), rm, res_sgn, res_sig, res_exp, v8);
// And finally, we tie them together.