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Partial fix for fp,min/fp.max models

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This commit is contained in:
Christoph M. Wintersteiger 2015-10-13 14:29:08 +01:00
parent e3ed0159a8
commit 099775947e
9 changed files with 115 additions and 148 deletions
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64
src/ast/fpa/fpa2bv_converter.cpp
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@ -35,7 +35,11 @@ fpa2bv_converter::fpa2bv_converter(ast_manager & m) :
m_arith_util(m),
m_mpf_manager(m_util.fm()),
m_mpz_manager(m_mpf_manager.mpz_manager()),
m_hi_fp_unspecified(true),
m_hi_fp_unspecified(true),
m_min_pn_zeros(0, m),
m_min_np_zeros(0, m),
m_max_pn_zeros(0, m),
m_max_np_zeros(0, m),
m_extra_assertions(m) {
m_plugin = static_cast<fpa_decl_plugin*>(m.get_plugin(m.mk_family_id("fpa")));
}
@ -1064,7 +1068,7 @@ void fpa2bv_converter::mk_abs(func_decl * f, unsigned num, expr * const * args,
mk_fp(m_bv_util.mk_numeral(0, 1), e, s, result);
}
void fpa2bv_converter::mk_min(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
void fpa2bv_converter::mk_min_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
SASSERT(num == 2);
expr * x = args[0], * y = args[1];
@ -1086,16 +1090,11 @@ void fpa2bv_converter::mk_min(func_decl * f, unsigned num, expr * const * args,
sgn_diff = m.mk_not(m.mk_eq(x_sgn, y_sgn));
expr_ref lt(m);
mk_float_lt(f, num, args, lt);
expr_ref zz(m);
zz = mk_min_unspecified(f, x, y);
TRACE("fpa2bv", tout << "min = " << mk_ismt2_pp(zz, m) << std::endl;);
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), zz, result, result);
mk_ite(y_is_nan, x, result, result);
mk_ite(x_is_nan, y, result, result);
@ -1111,33 +1110,40 @@ expr_ref fpa2bv_converter::mk_min_unspecified(func_decl * f, expr * x, expr * y)
if (m_hi_fp_unspecified)
// The hardware interpretation is -0.0.
mk_nzero(f, res);
mk_nzero(f, res);
else {
app_ref pn_nondet(m), np_nondet(m);
pn_nondet = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
np_nondet = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
m_decls_to_hide.insert(pn_nondet->get_decl());
m_decls_to_hide.insert(np_nondet->get_decl());
if (m_min_pn_zeros.get() == 0) m_min_pn_zeros = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
if (m_min_np_zeros.get() == 0) m_min_np_zeros = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
expr_ref pn(m), np(m);
mk_fp(pn_nondet,
mk_fp(m_min_pn_zeros,
m_bv_util.mk_numeral(0, ebits),
m_bv_util.mk_numeral(0, sbits - 1),
pn);
mk_fp(np_nondet,
mk_fp(m_min_np_zeros,
m_bv_util.mk_numeral(0, ebits),
m_bv_util.mk_numeral(0, sbits - 1),
np);
expr_ref x_is_pzero(m), x_is_nzero(m);
expr_ref x_is_pzero(m), x_is_nzero(m), ite(m);
mk_is_pzero(x, x_is_pzero);
mk_is_nzero(y, x_is_nzero);
mk_ite(m.mk_and(x_is_pzero, x_is_nzero), pn, np, res);
mk_ite(m.mk_and(x_is_pzero, x_is_nzero), pn, np, ite);
expr * args[] = { x, y };
mk_uninterpreted_function(f, 2, args, res);
expr_ref pzero(m), nzero(m), extra(m);
mk_pzero(f, pzero);
mk_nzero(f, nzero);
extra = m.mk_or(m.mk_eq(ite, pzero), m.mk_eq(ite, nzero));
m_extra_assertions.push_back(extra);
}
return res;
}
void fpa2bv_converter::mk_max(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
void fpa2bv_converter::mk_max_i(func_decl * f, unsigned num, expr * const * args, expr_ref & result) {
SASSERT(num == 2);
expr * x = args[0], *y = args[1];
@ -1160,14 +1166,10 @@ void fpa2bv_converter::mk_max(func_decl * f, unsigned num, expr * const * args,
expr_ref gt(m);
mk_float_gt(f, num, args, gt);
expr_ref zz(m);
zz = mk_max_unspecified(f, x, y);
result = y;
mk_ite(gt, x, result, result);
mk_ite(both_zero, y, result, result);
mk_ite(m.mk_and(both_zero, sgn_diff), zz, result, result);
mk_ite(both_zero, y, result, result);
mk_ite(y_is_nan, x, result, result);
mk_ite(x_is_nan, y, result, result);
@ -1185,21 +1187,19 @@ expr_ref fpa2bv_converter::mk_max_unspecified(func_decl * f, expr * x, expr * y)
// The hardware interpretation is +0.0.
mk_pzero(f, res);
else {
app_ref pn_nondet(m), np_nondet(m);
pn_nondet = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
np_nondet = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
m_decls_to_hide.insert(pn_nondet->get_decl());
m_decls_to_hide.insert(np_nondet->get_decl());
if (m_max_pn_zeros.get() == 0) m_max_pn_zeros = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
if (m_max_np_zeros.get() == 0) m_max_np_zeros = m.mk_fresh_const(0, m_bv_util.mk_sort(1));
expr_ref pn(m), np(m);
mk_fp(pn_nondet,
mk_fp(m_max_pn_zeros,
m_bv_util.mk_numeral(0, ebits),
m_bv_util.mk_numeral(0, sbits - 1),
pn);
mk_fp(np_nondet,
mk_fp(m_max_np_zeros,
m_bv_util.mk_numeral(0, ebits),
m_bv_util.mk_numeral(0, sbits - 1),
np);
expr_ref x_is_pzero(m), x_is_nzero(m);
mk_is_pzero(x, x_is_pzero);
mk_is_nzero(y, x_is_nzero);