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Added extraction of uint64 significand bits from FP numerals.

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This commit is contained in:
Christoph M. Wintersteiger 2015-06-09 12:28:23 +01:00
parent 624cc8a874
commit d39969f0a0
2 changed files with 37 additions and 0 deletions
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23
src/api/api_fpa.cpp
View file

@ -765,7 +765,30 @@ extern "C" {
mpqm.display_decimal(ss, q, sbits);
return mk_c(c)->mk_external_string(ss.str());
Z3_CATCH_RETURN("");
}
Z3_bool Z3_API Z3_fpa_get_numeral_significand_uint64(__in Z3_context c, __in Z3_ast t, __out __uint64 * n) {
Z3_TRY;
LOG_Z3_fpa_get_numeral_significand_uint64(c, t, n);
RESET_ERROR_CODE();
ast_manager & m = mk_c(c)->m();
mpf_manager & mpfm = mk_c(c)->fpautil().fm();
unsynch_mpz_manager & mpzm = mpfm.mpz_manager();
fpa_decl_plugin * plugin = (fpa_decl_plugin*)m.get_plugin(mk_c(c)->get_fpa_fid());
scoped_mpf val(mpfm);
bool r = plugin->is_numeral(to_expr(t), val);
if (!r) {
SET_ERROR_CODE(Z3_INVALID_ARG);
return 0;
}
const mpz & z = mpfm.sig(val);
if (!mpzm.is_uint64(z)) {
SET_ERROR_CODE(Z3_INVALID_ARG);
return 0;
}
*n = mpzm.get_uint64(z);
return 1;
Z3_CATCH_RETURN(0);
}
Z3_string Z3_API Z3_fpa_get_numeral_exponent_string(__in Z3_context c, __in Z3_ast t) {

14
src/api/z3_fpa.h
View file

@ -858,6 +858,20 @@ extern "C" {
*/
Z3_string Z3_API Z3_fpa_get_numeral_significand_string(__in Z3_context c, __in Z3_ast t);
/**
\brief Return the significand value of a floating-point numeral as a uint64.
\param c logical context
\param t a floating-point numeral
Remarks: This function extracts the significand bits in `t`, without the
hidden bit or normalization. Sets the Z3_INVALID_ARG error code if the
signicand does not fit into a uint64.
def_API('Z3_fpa_get_numeral_significand_uint64', BOOL, (_in(CONTEXT), _in(AST)))
*/
Z3_bool Z3_API Z3_fpa_get_numeral_significand_uint64(__in Z3_context c, __in Z3_ast t, __out __uint64 * n);
/**
\brief Return the exponent value of a floating-point numeral as a string