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Fixed missing bit of precision in fp.to_ubv/fp.to_sbv. Thanks to Youcheng Sun for reporting this bug.

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This commit is contained in:
Christoph M. Wintersteiger 2018-02-03 15:16:23 +00:00
parent ad3b0ecad0
commit 8689921e9c
1 changed files with 4 additions and 3 deletions
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7
src/ast/fpa/fpa2bv_converter.cpp
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@ -3139,6 +3139,7 @@ void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args
unsigned bv_sz = (unsigned)f->get_parameter(0).get_int();
expr_ref bv0(m), bv1(m);
bv0 = m_bv_util.mk_numeral(0, 1);
bv1 = m_bv_util.mk_numeral(1, 1);
expr_ref x_is_nan(m), x_is_inf(m), x_is_zero(m), x_is_neg(m), x_is_nzero(m);
@ -3188,9 +3189,9 @@ void fpa2bv_converter::mk_to_bv(func_decl * f, unsigned num, expr * const * args
exp_m_lz = m_bv_util.mk_bv_sub(m_bv_util.mk_sign_extend(2, exp),
m_bv_util.mk_zero_extend(2, lz));
// big_sig is +- [... bv_sz+2 bits ...].[r][g][ ... sbits-1 ... ]
big_sig = m_bv_util.mk_zero_extend(bv_sz+2, sig);
unsigned big_sig_sz = sig_sz+bv_sz+2;
// big_sig is +- [... bv_sz+2 bits ...][1].[r][ ... sbits-1 ... ]
big_sig = m_bv_util.mk_concat(m_bv_util.mk_zero_extend(bv_sz + 2, sig), bv0);
unsigned big_sig_sz = sig_sz+1+bv_sz+2;
SASSERT(m_bv_util.get_bv_size(big_sig) == big_sig_sz);
is_neg_shift = m_bv_util.mk_sle(exp_m_lz, m_bv_util.mk_numeral(0, ebits+2));