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https://github.com/Z3Prover/z3
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@ -1122,12 +1122,13 @@ void fpa2bv_converter::mk_rem(sort * s, expr_ref & x, expr_ref & y, expr_ref & r
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a_lz_ext = m_bv_util.mk_zero_extend(2, a_lz);
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b_lz_ext = m_bv_util.mk_zero_extend(2, b_lz);
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expr_ref exp_diff(m), neg_exp_diff(m), exp_diff_is_neg(m);
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expr_ref exp_diff(m), neg_exp_diff(m), exp_diff_is_neg(m), exp_diff_is_zero(m);
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exp_diff = m_bv_util.mk_bv_sub(
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m_bv_util.mk_bv_sub(a_exp_ext, a_lz_ext),
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m_bv_util.mk_bv_sub(b_exp_ext, b_lz_ext));
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neg_exp_diff = m_bv_util.mk_bv_neg(exp_diff);
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exp_diff_is_neg = m_bv_util.mk_sle(exp_diff, m_bv_util.mk_numeral(0, ebits+2));
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exp_diff_is_zero = m.mk_eq(exp_diff, m_bv_util.mk_numeral(0, m_bv_util.get_bv_size(exp_diff)));
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dbg_decouple("fpa2bv_rem_exp_diff", exp_diff);
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// CMW: This creates _huge_ bit-vectors, which is potentially sub-optimal,
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@ -1153,7 +1154,7 @@ void fpa2bv_converter::mk_rem(sort * s, expr_ref & x, expr_ref & y, expr_ref & r
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expr_ref y_half(m), ny_half(m), zero_e(m), two_e(m);
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expr_ref y_half_is_zero(m), y_half_is_nz(m);
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expr_ref r_gt_y_half(m), r_gt_ny_half(m), r_lt_y_half(m), r_lt_ny_half(m);
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expr_ref r_ge_y_half(m), r_gt_ny_half(m), r_le_y_half(m), r_lt_ny_half(m);
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expr_ref r_ge_zero(m), r_le_zero(m);
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expr_ref rounded_sub_y(m), rounded_add_y(m);
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mpf zero, two;
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@ -1166,21 +1167,30 @@ void fpa2bv_converter::mk_rem(sort * s, expr_ref & x, expr_ref & y, expr_ref & r
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mk_is_zero(y_half, y_half_is_zero);
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y_half_is_nz = m.mk_not(y_half_is_zero);
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mk_float_gt(s, rndd, y_half, r_gt_y_half);
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mk_float_ge(s, rndd, y_half, r_ge_y_half);
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mk_float_gt(s, rndd, ny_half, r_gt_ny_half);
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mk_float_lt(s, rndd, y_half, r_lt_y_half);
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mk_float_le(s, rndd, y_half, r_le_y_half);
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mk_float_lt(s, rndd, ny_half, r_lt_ny_half);
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mk_sub(s, rne_bv, rndd, y, rounded_sub_y);
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mk_add(s, rne_bv, rndd, y, rounded_add_y);
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expr_ref sub_cnd(m), add_cnd(m);
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sub_cnd = m.mk_and(y_half_is_nz,
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m.mk_or(m.mk_and(y_is_pos, r_gt_y_half),
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m.mk_and(y_is_neg, r_lt_y_half)));
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add_cnd = m.mk_and(y_half_is_nz,
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sub_cnd = m.mk_and(exp_diff_is_zero,
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m.mk_and(y_half_is_nz,
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m.mk_or(m.mk_and(y_is_pos, r_ge_y_half),
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m.mk_and(y_is_neg, r_le_y_half))));
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add_cnd = m.mk_and(exp_diff_is_zero,
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m.mk_and(y_half_is_nz,
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m.mk_or(m.mk_and(y_is_pos, r_lt_ny_half),
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m.mk_and(y_is_neg, r_gt_ny_half)));
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m.mk_and(y_is_neg, r_gt_ny_half))));
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dbg_decouple("fpa2bv_rem_y_half", y_half);
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dbg_decouple("fpa2bv_rem_sub_cnd", sub_cnd);
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dbg_decouple("fpa2bv_rem_add_cnd", add_cnd);
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dbg_decouple("fpa2bv_rem_rounded_add_y", rounded_add_y);
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dbg_decouple("fpa2bv_rem_rounded_sub_y", rounded_sub_y);
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dbg_decouple("fpa2bv_rem_rndd", rndd);
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mk_ite(add_cnd, rounded_add_y, rndd, v7);
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mk_ite(sub_cnd, rounded_sub_y, v7, v7);
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