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More implementation of fp.to_ieee_bv for unspecified input/output

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Relates to #507
This commit is contained in:
Christoph M. Wintersteiger 2016-03-15 15:11:37 +00:00
parent a9df4a208f
commit 371573cbff
3 changed files with 40 additions and 19 deletions
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26
src/util/mpf.cpp
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@ -1190,18 +1190,28 @@ void mpf_manager::to_sbv_mpq(mpf_rounding_mode rm, const mpf & x, scoped_mpq & o
}
void mpf_manager::to_ieee_bv_mpz(const mpf & x, scoped_mpz & o) {
SASSERT(!is_nan(x) && !is_inf(x));
SASSERT(!is_nan(x));
SASSERT(exp(x) < INT_MAX);
unsigned sbits = x.get_sbits();
unsigned ebits = x.get_ebits();
scoped_mpz biased_exp(m_mpz_manager);
m_mpz_manager.set(biased_exp, bias_exp(ebits, exp(x)));
m_mpz_manager.set(o, sgn(x));
m_mpz_manager.mul2k(o, ebits);
m_mpz_manager.add(o, biased_exp, o);
m_mpz_manager.mul2k(o, sbits - 1);
m_mpz_manager.add(o, sig(x), o);
if (is_inf(x)) {
m_mpz_manager.set(o, sgn(x));
m_mpz_manager.mul2k(o, ebits);
const mpz & exp = m_powers2.m1(ebits);
m_mpz_manager.add(o, exp, o);
m_mpz_manager.mul2k(o, sbits - 1);
}
else {
scoped_mpz biased_exp(m_mpz_manager);
m_mpz_manager.set(biased_exp, bias_exp(ebits, exp(x)));
m_mpz_manager.set(o, sgn(x));
m_mpz_manager.mul2k(o, ebits);
m_mpz_manager.add(o, biased_exp, o);
m_mpz_manager.mul2k(o, sbits - 1);
m_mpz_manager.add(o, sig(x), o);
}
}
void mpf_manager::rem(mpf const & x, mpf const & y, mpf & o) {