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Fixed renormalization in fp.mul. Relates to #872.

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This commit is contained in:
Christoph M. Wintersteiger 2017-07-31 18:34:46 +01:00
parent 175f042db8
commit a59907170d
2 changed files with 7 additions and 3 deletions
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src/util/mpf.cpp
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@ -919,7 +919,7 @@ void mpf_manager::fma(mpf_rounding_mode rm, mpf const & x, mpf const & y, mpf co
mpf_exp_t min_exp = mk_min_exp(x.ebits);
unsigned sig_width = m_mpz_manager.prev_power_of_two(res.get().significand) + 1;
mpf_exp_t sig_lz = 2 * x.sbits - sig_width; // want << lz
mpf_exp_t sig_lz = 2 * x.sbits - sig_width;
mpf_exp_t max_exp_delta = res.exponent() - min_exp;
unsigned renorm_delta = (unsigned) std::max((mpf_exp_t)0, std::min(sig_lz, max_exp_delta));
res.get().exponent -= renorm_delta;