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FPA min/max -+0.0 special cases changed to +0.0 instead of second argument.

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Fixes #68
This commit is contained in:
Christoph M. Wintersteiger 2015-05-28 12:19:55 +01:00
parent 3d2ef8bb4a
commit 7619d609f9
2 changed files with 25 additions and 6 deletions
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12
src/ast/fpa/fpa2bv_converter.cpp
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@ -1071,7 +1071,7 @@ void fpa2bv_converter::mk_min(func_decl * f, unsigned num, expr * const * args,
split_fp(x, x_sgn, x_exp, x_sig);
split_fp(y, y_sgn, y_exp, y_sig);
expr_ref x_is_nan(m), y_is_nan(m), x_is_zero(m), y_is_zero(m), both_zero(m), pzero(m);
expr_ref x_is_nan(m), y_is_nan(m), x_is_zero(m), y_is_zero(m), both_zero(m), pzero(m);
mk_is_zero(x, x_is_zero);
mk_is_zero(y, y_is_zero);
m_simp.mk_and(x_is_zero, y_is_zero, both_zero);
@ -1079,12 +1079,16 @@ void fpa2bv_converter::mk_min(func_decl * f, unsigned num, expr * const * args,
mk_is_nan(y, y_is_nan);
mk_pzero(f, pzero);
expr_ref sgn_diff(m);
sgn_diff = m.mk_not(m.mk_eq(x_sgn, y_sgn));
expr_ref lt(m);
mk_float_lt(f, num, args, lt);
result = y;
mk_ite(lt, x, result, result);
mk_ite(both_zero, y, result, result);
mk_ite(m.mk_and(both_zero, sgn_diff), pzero, result, result); // min(-0.0, +0.0) = min(+0.0, -0.0) = +0.0
mk_ite(y_is_nan, x, result, result);
mk_ite(x_is_nan, y, result, result);
@ -1109,12 +1113,16 @@ void fpa2bv_converter::mk_max(func_decl * f, unsigned num, expr * const * args,
mk_is_nan(y, y_is_nan);
mk_pzero(f, pzero);
expr_ref sgn_diff(m);
sgn_diff = m.mk_not(m.mk_eq(x_sgn, y_sgn));
expr_ref gt(m);
mk_float_gt(f, num, args, gt);
result = y;
mk_ite(gt, x, result, result);
mk_ite(both_zero, y, result, result);
mk_ite(both_zero, y, result, result);
mk_ite(m.mk_and(both_zero, sgn_diff), pzero, result, result); // max(-0.0, +0.0) = max(+0.0, -0.0) = +0.0
mk_ite(y_is_nan, x, result, result);
mk_ite(x_is_nan, y, result, result);