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FPA API: reintroduced to_ieee_bv

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Signed-off-by: Christoph M. Wintersteiger <cwinter@microsoft.com>
This commit is contained in:
Christoph M. Wintersteiger 2014-12-11 12:05:52 +00:00
parent 72dbb2a513
commit d6ac98a494
6 changed files with 74 additions and 5 deletions
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11
src/api/api_fpa.cpp
View file

@ -398,4 +398,15 @@ extern "C" {
RETURN_Z3(r);
Z3_CATCH_RETURN(0);
}
Z3_ast Z3_API Z3_mk_fpa_to_ieee_bv(__in Z3_context c, __in Z3_ast t) {
Z3_TRY;
LOG_Z3_mk_fpa_to_ieee_bv(c, t);
RESET_ERROR_CODE();
api::context * ctx = mk_c(c);
Z3_ast r = of_ast(ctx->float_util().mk_float_to_ieee_bv(to_expr(t)));
RETURN_Z3(r);
Z3_CATCH_RETURN(0);
}
};

13
src/api/z3_fpa.h
View file

@ -555,6 +555,19 @@ extern "C" {
*/
Z3_ast Z3_API Z3_mk_fpa_convert(__in Z3_context c, __in Z3_sort s, __in Z3_ast rm, __in Z3_ast t);
/**
\brief Conversion of a floating point term to a bit-vector term in IEEE754 format.
\param c logical context.
\param t floating-point term.
t must have floating point sort. The size of the resulting bit-vector is automatically determined.
def_API('Z3_mk_fpa_to_ieee_bv', AST, (_in(CONTEXT),_in(AST)))
*/
Z3_ast Z3_API Z3_mk_fpa_to_ieee_bv(__in Z3_context c, __in Z3_ast t);
/*@}*/
/*@}*/

20
src/ast/float_decl_plugin.cpp
View file

@ -565,6 +565,21 @@ func_decl * float_decl_plugin::mk_to_real(decl_kind k, unsigned num_parameters,
return m_manager->mk_func_decl(name, 1, domain, m_real_sort, func_decl_info(m_family_id, k));
}
func_decl * float_decl_plugin::mk_float_to_ieee_bv(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range) {
if (arity != 1)
m_manager->raise_exception("invalid number of arguments to asIEEEBV");
if (!is_float_sort(domain[0]))
m_manager->raise_exception("sort mismatch, expected argument of FloatingPoint sort");
unsigned float_sz = domain[0]->get_parameter(0).get_int() + domain[0]->get_parameter(1).get_int();
parameter ps[] = { parameter(float_sz) };
sort * bv_srt = m_bv_plugin->mk_sort(m_bv_fid, 1, ps);
symbol name("to_ieee_bv");
return m_manager->mk_func_decl(name, 1, domain, bv_srt, func_decl_info(m_family_id, k, num_parameters, parameters));
}
func_decl * float_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range) {
switch (k) {
@ -629,6 +644,8 @@ func_decl * float_decl_plugin::mk_func_decl(decl_kind k, unsigned num_parameters
return mk_to_fp(k, num_parameters, parameters, arity, domain, range);
case OP_FLOAT_TO_FP_UNSIGNED:
return mk_to_fp_unsigned(k, num_parameters, parameters, arity, domain, range);
case OP_FLOAT_TO_IEEE_BV:
return mk_float_to_ieee_bv(k, num_parameters, parameters, arity, domain, range);
default:
m_manager->raise_exception("unsupported floating point operator");
return 0;
@ -687,6 +704,9 @@ void float_decl_plugin::get_op_names(svector<builtin_name> & op_names, symbol co
op_names.push_back(builtin_name("to_fp", OP_FLOAT_TO_FP));
op_names.push_back(builtin_name("to_fp_unsigned", OP_FLOAT_TO_FP_UNSIGNED));
/* Extensions */
op_names.push_back(builtin_name("to_ieee_bv", OP_FLOAT_TO_IEEE_BV));
}
void float_decl_plugin::get_sort_names(svector<builtin_name> & sort_names, symbol const & logic) {

15
src/ast/float_decl_plugin.h
View file

@ -82,6 +82,9 @@ enum float_op_kind {
OP_FLOAT_TO_UBV,
OP_FLOAT_TO_SBV,
OP_FLOAT_TO_REAL,
/* Extensions */
OP_FLOAT_TO_IEEE_BV,
LAST_FLOAT_OP
};
@ -139,12 +142,14 @@ class float_decl_plugin : public decl_plugin {
func_decl * mk_to_fp_unsigned(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
func_decl * mk_to_ubv(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
unsigned arity, sort * const * domain, sort * range);
func_decl * mk_to_sbv(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
unsigned arity, sort * const * domain, sort * range);
func_decl * mk_to_real(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
unsigned arity, sort * const * domain, sort * range);
func_decl * mk_float_to_ieee_bv(decl_kind k, unsigned num_parameters, parameter const * parameters,
unsigned arity, sort * const * domain, sort * range);
virtual void set_manager(ast_manager * m, family_id id);
unsigned mk_id(mpf const & v);
void recycled_id(unsigned id);
@ -276,6 +281,8 @@ public:
app * mk_is_negative(expr * arg1) { return m().mk_app(m_fid, OP_FLOAT_IS_NEGATIVE, arg1); }
bool is_neg(expr * a) { return is_app_of(a, m_fid, OP_FLOAT_NEG); }
app * mk_float_to_ieee_bv(expr * arg1) { return m().mk_app(m_fid, OP_FLOAT_TO_IEEE_BV, arg1); }
};
#endif

1
src/ast/rewriter/float_rewriter.cpp
View file

@ -68,6 +68,7 @@ br_status float_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * c
case OP_FLOAT_TO_UBV: SASSERT(num_args == 2); st = mk_to_ubv(args[0], args[1], result); break;
case OP_FLOAT_TO_SBV: SASSERT(num_args == 2); st = mk_to_sbv(args[0], args[1], result); break;
case OP_FLOAT_TO_REAL: SASSERT(num_args == 1); st = mk_to_real(args[0], result); break;
case OP_FLOAT_TO_IEEE_BV: SASSERT(num_args == 1); st = mk_to_ieee_bv(args[0], result); break;
}
return st;
}

19
src/smt/theory_fpa.cpp
View file

@ -135,7 +135,13 @@ namespace smt {
simp(a->get_arg(2), exp, pr_exp);
m_converter.mk_triple(sgn, sig, exp, bv_term);
}
}
else if (term->get_decl_kind() == OP_FLOAT_TO_IEEE_BV) {
SASSERT(is_app(t));
expr_ref bv_e(m);
proof_ref bv_pr(m);
simp(t, bv_term, bv_pr);
}
else
NOT_IMPLEMENTED_YET();
@ -414,6 +420,17 @@ namespace smt {
ctx.mark_as_relevant(bv_sig);
ctx.mark_as_relevant(bv_exp);
}
else if (n->get_decl()->get_decl_kind() == OP_FLOAT_TO_IEEE_BV) {
expr_ref eq(m);
app * ex_a = to_app(ex);
if (n->get_id() > ex_a->get_id())
std::swap(n, ex_a);
eq = m.mk_eq(n, ex_a);
ctx.internalize(eq, false);
literal l = ctx.get_literal(eq);
ctx.mk_th_axiom(get_id(), 1, &l);
ctx.mark_as_relevant(l);
}
else
NOT_IMPLEMENTED_YET();
}