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Bugfix for special-case handling in fp.fma.

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Thanks to Florian Schanda for reporting this bug.

(+reversed accidental debug code commit).
This commit is contained in:
Christoph M. Wintersteiger 2016-12-09 15:03:31 +00:00
parent 56b1a8b086
commit 16b32ecf12
2 changed files with 24 additions and 24 deletions
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5
src/util/mpf.cpp
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@ -795,8 +795,9 @@ void mpf_manager::fma(mpf_rounding_mode rm, mpf const & x, mpf const & y, mpf co
set(o, z);
}
else if (is_zero(x) || is_zero(y)) {
if (is_zero(z) && rm != MPF_ROUND_TOWARD_NEGATIVE)
mk_pzero(x.ebits, x.sbits, o);
bool xy_sgn = is_neg(x) ^ is_neg(y);
if (is_zero(z) && xy_sgn ^ is_neg(z))
mk_zero(x.ebits, x.sbits, rm != MPF_ROUND_TOWARD_NEGATIVE, o);
else
set(o, z);
}