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Eliminated unspecified operators for fp.to_*bv, fp.to_real. Also fixes #1191.

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This commit is contained in:
Christoph M. Wintersteiger 2017-09-12 19:43:45 +01:00
parent 85697dff3e
commit 31cfca0444
11 changed files with 118 additions and 337 deletions
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64
src/ast/rewriter/fpa_rewriter.cpp
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@ -103,57 +103,12 @@ br_status fpa_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_FPA_BVWRAP: SASSERT(num_args == 1); st = mk_bvwrap(args[0], result); break;
case OP_FPA_BV2RM: SASSERT(num_args == 1); st = mk_bv2rm(args[0], result); break;
case OP_FPA_TO_UBV_UNSPECIFIED:
case OP_FPA_TO_SBV_UNSPECIFIED:
case OP_FPA_TO_REAL_UNSPECIFIED:
case OP_FPA_TO_IEEE_BV_UNSPECIFIED:
st = BR_FAILED;
break;
default:
NOT_IMPLEMENTED_YET();
}
return st;
}
br_status fpa_rewriter::mk_to_ubv_unspecified(unsigned ebits, unsigned sbits, unsigned width, expr_ref & result) {
bv_util bu(m());
if (m_hi_fp_unspecified) {
// The "hardware interpretation" is 0.
result = bu.mk_numeral(0, width);
return BR_DONE;
}
else {
result = m_util.mk_to_ubv_unspecified(ebits, sbits, width);
return BR_REWRITE1;
}
}
br_status fpa_rewriter::mk_to_sbv_unspecified(unsigned ebits, unsigned sbits, unsigned width, expr_ref & result) {
bv_util bu(m());
if (m_hi_fp_unspecified) {
// The "hardware interpretation" is 0.
result = bu.mk_numeral(0, width);
return BR_DONE;
}
else {
result = m_util.mk_to_sbv_unspecified(ebits, sbits, width);
return BR_REWRITE1;
}
}
br_status fpa_rewriter::mk_to_real_unspecified(unsigned ebits, unsigned sbits, expr_ref & result) {
if (m_hi_fp_unspecified) {
// The "hardware interpretation" is 0.
result = m_util.au().mk_numeral(rational(0), false);
return BR_DONE;
}
else {
result = m_util.mk_to_real_unspecified(ebits, sbits);
return BR_REWRITE1;
}
}
br_status fpa_rewriter::mk_to_fp(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
SASSERT(f->get_num_parameters() == 2);
SASSERT(f->get_parameter(0).is_int());
@ -808,7 +763,7 @@ br_status fpa_rewriter::mk_to_ubv(func_decl * f, expr * arg1, expr * arg2, expr_
const mpf & x = v.get();
if (m_fm.is_nan(v) || m_fm.is_inf(v) || m_fm.is_neg(v))
return mk_to_ubv_unspecified(x.get_ebits(), x.get_sbits(), bv_sz, result);
return BR_FAILED;
bv_util bu(m());
scoped_mpq q(m_fm.mpq_manager());
@ -822,9 +777,6 @@ br_status fpa_rewriter::mk_to_ubv(func_decl * f, expr * arg1, expr * arg2, expr_
result = bu.mk_numeral(r, bv_sz);
return BR_DONE;
}
else
return mk_to_ubv_unspecified(x.get_ebits(), x.get_sbits(), bv_sz, result);
}
return BR_FAILED;
@ -842,7 +794,7 @@ br_status fpa_rewriter::mk_to_sbv(func_decl * f, expr * arg1, expr * arg2, expr_
const mpf & x = v.get();
if (m_fm.is_nan(v) || m_fm.is_inf(v))
return mk_to_sbv_unspecified(x.get_ebits(), x.get_sbits(), bv_sz, result);
return BR_FAILED;
bv_util bu(m());
scoped_mpq q(m_fm.mpq_manager());
@ -856,8 +808,6 @@ br_status fpa_rewriter::mk_to_sbv(func_decl * f, expr * arg1, expr * arg2, expr_
result = bu.mk_numeral(r, bv_sz);
return BR_DONE;
}
else
return mk_to_sbv_unspecified(x.get_ebits(), x.get_sbits(), bv_sz, result);
}
return BR_FAILED;
@ -881,7 +831,7 @@ br_status fpa_rewriter::mk_to_ieee_bv(func_decl * f, expr * arg, expr_ref & resu
result = bu.mk_concat(4, args);
}
else
result = m_util.mk_to_ieee_bv_unspecified(x.get_ebits(), x.get_sbits());
return BR_FAILED;
return BR_REWRITE1;
}
@ -900,16 +850,12 @@ br_status fpa_rewriter::mk_to_real(expr * arg, expr_ref & result) {
scoped_mpf v(m_fm);
if (m_util.is_numeral(arg, v)) {
if (m_fm.is_nan(v) || m_fm.is_inf(v)) {
const mpf & x = v.get();
result = m_util.mk_to_real_unspecified(x.get_ebits(), x.get_sbits());
}
else {
if (!m_fm.is_nan(v) && !m_fm.is_inf(v)) {
scoped_mpq r(m_fm.mpq_manager());
m_fm.to_rational(v, r);
result = m_util.au().mk_numeral(r.get(), false);
return BR_DONE;
}
return BR_DONE;
}
return BR_FAILED;