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MPF bugfix

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Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>
This commit is contained in:
Christoph M. Wintersteiger 2014-12-31 14:48:06 +00:00
parent defb6158fe
commit 2258988b37
1 changed files with 15 additions and 7 deletions
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22
src/util/mpf.cpp
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@ -301,28 +301,36 @@ void mpf_manager::set(mpf & o, unsigned ebits, unsigned sbits, mpf_rounding_mode
m_mpq_manager.mul(sig, 2, sig);
m_mpz_manager.dec(exp);
}
// 1.0 <= sig < 2.0
SASSERT((m_mpq_manager.le(1, sig) && m_mpq_manager.lt(sig, 2)));
TRACE("mpf_dbg", tout << "sig = " << m_mpq_manager.to_string(sig) << " exp = " << m_mpz_manager.to_string(exp) << std::endl;);
TRACE("mpf_dbg", tout << "sig = " << m_mpq_manager.to_string(sig) <<
" exp = " << m_mpz_manager.to_string(exp) << std::endl;);
m_mpz_manager.set(o.significand, 0);
for (unsigned i = 0; i < (sbits+3); i++) {
m_mpz_manager.mul2k(o.significand, 1);
if (!m_mpq_manager.lt(sig, 1)) {
m_mpz_manager.inc(o.significand);
if (m_mpq_manager.ge(sig, 1)) {
m_mpz_manager.inc(o.significand);
m_mpq_manager.dec(sig);
}
m_mpq_manager.mul(sig, 2, sig);
m_mpq_manager.mul(sig, mpq(2), sig);
}
// sticky
if (!m_mpq_manager.is_zero(sig) && m_mpz_manager.is_even(o.significand))
m_mpz_manager.inc(o.significand);
TRACE("mpf_dbg", tout << "sig = " << m_mpz_manager.to_string(o.significand) <<
" exp = " << o.exponent << std::endl;);
if (m_mpz_manager.is_small(exp)) {
o.exponent = m_mpz_manager.get_int64(exp);
round(rm, o);
}
else
mk_inf(ebits, sbits, o.sign, o); // CMW: output warning message? throw exception?
mk_inf(ebits, sbits, o.sign, o);
}
TRACE("mpf_dbg", tout << "set: res = " << to_string(o) << std::endl;);