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Bugfix for fp.roundToIntegral.

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Fixes #69
This commit is contained in:
Christoph M. Wintersteiger 2015-05-21 18:12:14 +01:00
parent c422b48bf4
commit 8c18bdcca9
2 changed files with 25 additions and 16 deletions
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28
src/util/mpf.cpp
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@ -1006,11 +1006,22 @@ void mpf_manager::round_to_integral(mpf_rounding_mode rm, mpf const & x, mpf & o
else if (is_zero(x))
mk_zero(x.ebits, x.sbits, x.sign, o); // -0.0 -> -0.0, says IEEE754, Sec 5.9.
else if (x.exponent < 0) {
if (rm == MPF_ROUND_TOWARD_ZERO ||
rm == MPF_ROUND_TOWARD_NEGATIVE)
if (rm == MPF_ROUND_TOWARD_ZERO)
mk_zero(x.ebits, x.sbits, x.sign, o);
else if (rm == MPF_ROUND_NEAREST_TEVEN ||
rm == MPF_ROUND_NEAREST_TAWAY) {
else if (rm == MPF_ROUND_TOWARD_NEGATIVE) {
if (x.sign)
mk_one(x.ebits, x.sbits, true, o);
else
mk_zero(x.ebits, x.sbits, false, o);
}
else if (rm == MPF_ROUND_TOWARD_POSITIVE) {
if (x.sign)
mk_zero(x.ebits, x.sbits, true, o);
else
mk_one(x.ebits, x.sbits, false, o);
}
else {
SASSERT(rm == MPF_ROUND_NEAREST_TEVEN || rm == MPF_ROUND_NEAREST_TAWAY);
bool tie = m_mpz_manager.is_zero(x.significand) && x.exponent == -1;
TRACE("mpf_dbg", tout << "tie = " << tie << std::endl;);
if (tie && rm == MPF_ROUND_NEAREST_TEVEN)
@ -1019,15 +1030,8 @@ void mpf_manager::round_to_integral(mpf_rounding_mode rm, mpf const & x, mpf & o
mk_one(x.ebits, x.sbits, x.sign, o);
else if (x.exponent < -1)
mk_zero(x.ebits, x.sbits, x.sign, o);
else
mk_one(x.ebits, x.sbits, x.sign, o);
}
else {
SASSERT(rm == MPF_ROUND_TOWARD_POSITIVE);
if (x.sign)
mk_nzero(x.ebits, x.sbits, o);
else
mk_one(x.ebits, x.sbits, false, o);
mk_one(x.ebits, x.sbits, x.sign, o);
}
}
else if (x.exponent >= x.sbits - 1)