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Fixed RNA FP rounding mode semantics. Fixes #1190 and bugs reported by Youcheng Sun.

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This commit is contained in:
Christoph M. Wintersteiger 2018-02-03 16:44:44 +00:00
parent 8689921e9c
commit c3ed986031
2 changed files with 2 additions and 6 deletions
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6
src/ast/fpa/fpa2bv_converter.cpp
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@ -3746,14 +3746,10 @@ expr_ref fpa2bv_converter::mk_rounding_decision(expr * rm, expr * sgn, expr * la
expr * nround_lors[2] = { not_round, not_lors };
expr * pos_args[2] = { sgn, not_rors };
expr * neg_args[2] = { not_sgn, not_rors };
expr * nl_r[2] = { last, not_round };
expr * nl_nr_sn[3] = { not_last, not_round, not_sticky };
expr_ref inc_teven(m), inc_taway(m), inc_pos(m), inc_neg(m);
inc_teven = m_bv_util.mk_bv_not(m_bv_util.mk_bv_or(2, nround_lors));
expr *taway_args[2] = { m_bv_util.mk_bv_not(m_bv_util.mk_bv_or(2, nl_r)),
m_bv_util.mk_bv_not(m_bv_util.mk_bv_or(3, nl_nr_sn)) };
inc_taway = m_bv_util.mk_bv_or(2, taway_args);
inc_taway = round;
inc_pos = m_bv_util.mk_bv_not(m_bv_util.mk_bv_or(2, pos_args));
inc_neg = m_bv_util.mk_bv_not(m_bv_util.mk_bv_or(2, neg_args));

2
src/util/mpf.cpp
View file

@ -2045,7 +2045,7 @@ void mpf_manager::round(mpf_rounding_mode rm, mpf & o) {
bool inc = false;
switch (rm) {
case MPF_ROUND_NEAREST_TEVEN: inc = round && (last || sticky); break;
case MPF_ROUND_NEAREST_TAWAY: inc = round && (!last || sticky); break;
case MPF_ROUND_NEAREST_TAWAY: inc = round; break;
case MPF_ROUND_TOWARD_POSITIVE: inc = (!o.sign && (round || sticky)); break;
case MPF_ROUND_TOWARD_NEGATIVE: inc = (o.sign && (round || sticky)); break;
case MPF_ROUND_TOWARD_ZERO: inc = false; break;