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Integrate fixes from #5512

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Pull request #5512 identifies a in line 1139 where the const-case-multiplier constructor returns false and does useless work.
In this update we also remove mk_const_multiplier because code path is subsumed by mk_const_case_multiplier.
This commit is contained in:
Nikolaj Bjorner 2021-08-28 10:46:45 -07:00
parent 992daa6d2e
commit e3a83dd0dd
2 changed files with 13 additions and 53 deletions
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1
src/ast/rewriter/bit_blaster/bit_blaster_tpl.h
View file

@ -117,7 +117,6 @@ public:
void mk_comp(unsigned sz, expr * const * a_bits, expr * const * b_bits, expr_ref_vector & out_bits);
void mk_carry_save_adder(unsigned sz, expr * const * a_bits, expr * const * b_bits, expr * const * c_bits, expr_ref_vector & sum_bits, expr_ref_vector & carry_bits);
bool mk_const_multiplier(unsigned sz, expr * const * a_bits, expr * const * b_bits, expr_ref_vector & out_bits);
bool mk_const_case_multiplier(unsigned sz, expr * const * a_bits, expr * const * b_bits, expr_ref_vector & out_bits);
void mk_const_case_multiplier(bool is_a, unsigned i, unsigned sz, ptr_buffer<expr, 128>& a_bits, ptr_buffer<expr, 128>& b_bits, expr_ref_vector & out_bits);

65
src/ast/rewriter/bit_blaster/bit_blaster_tpl_def.h
View file

@ -195,11 +195,11 @@ void bit_blaster_tpl<Cfg>::mk_multiplier(unsigned sz, expr * const * a_bits, exp
return;
}
if (mk_const_multiplier(sz, a_bits, b_bits, out_bits)) {
if (mk_const_case_multiplier(sz, a_bits, b_bits, out_bits)) {
SASSERT(sz == out_bits.size());
return;
}
if (mk_const_multiplier(sz, b_bits, a_bits, out_bits)) {
if (mk_const_case_multiplier(sz, b_bits, a_bits, out_bits)) {
SASSERT(sz == out_bits.size());
return;
}
@ -1136,14 +1136,18 @@ bool bit_blaster_tpl<Cfg>::mk_const_case_multiplier(unsigned sz, expr * const *
ptr_buffer<expr, 128> nb_bits;
nb_bits.append(sz, b_bits);
mk_const_case_multiplier(true, 0, sz, na_bits, nb_bits, out_bits);
return false;
return true;
}
template<typename Cfg>
void bit_blaster_tpl<Cfg>::mk_const_case_multiplier(bool is_a, unsigned i, unsigned sz, ptr_buffer<expr, 128>& a_bits, ptr_buffer<expr, 128>& b_bits, expr_ref_vector & out_bits) {
while (is_a && i < sz && is_bool_const(a_bits[i])) ++i;
if (is_a && i == sz) { is_a = false; i = 0; }
while (!is_a && i < sz && is_bool_const(b_bits[i])) ++i;
if (is_a && i == sz) {
is_a = false;
i = 0;
}
while (!is_a && i < sz && is_bool_const(b_bits[i]))
++i;
if (i < sz) {
expr_ref_vector out1(m()), out2(m());
expr_ref x(m());
@ -1154,9 +1158,11 @@ void bit_blaster_tpl<Cfg>::mk_const_case_multiplier(bool is_a, unsigned i, unsig
mk_const_case_multiplier(is_a, i+1, sz, a_bits, b_bits, out2);
if (is_a) a_bits[i] = x; else b_bits[i] = x;
SASSERT(out_bits.empty());
expr_ref bit(m());
for (unsigned j = 0; j < sz; ++j) {
out_bits.push_back(m().mk_ite(x, out1[j].get(), out2[j].get()));
}
mk_ite(x, out1.get(j), out2.get(j), bit);
out_bits.push_back(bit);
}
}
else {
numeral n_a, n_b;
@ -1168,48 +1174,3 @@ void bit_blaster_tpl<Cfg>::mk_const_case_multiplier(bool is_a, unsigned i, unsig
}
SASSERT(out_bits.size() == sz);
}
template<typename Cfg>
bool bit_blaster_tpl<Cfg>::mk_const_multiplier(unsigned sz, expr * const * a_bits, expr * const * b_bits, expr_ref_vector & out_bits) {
numeral n_a;
if (!is_numeral(sz, a_bits, n_a)) {
return false;
}
SASSERT(out_bits.empty());
if (mk_const_case_multiplier(sz, a_bits, b_bits, out_bits)) {
SASSERT(sz == out_bits.size());
return true;
}
out_bits.reset();
expr_ref_vector minus_b_bits(m()), tmp(m());
mk_neg(sz, b_bits, minus_b_bits);
out_bits.resize(sz, m().mk_false());
bool last = false, now;
for (unsigned i = 0; i < sz; i++) {
now = m().is_true(a_bits[i]);
SASSERT(now || m().is_false(a_bits[i]));
tmp.reset();
if (now && !last) {
mk_adder(sz - i, out_bits.data() + i, minus_b_bits.data(), tmp);
for (unsigned j = 0; j < (sz - i); j++)
out_bits.set(i+j, tmp.get(j)); // do not use [], it does not work on Linux.
}
else if (!now && last) {
mk_adder(sz - i, out_bits.data() + i, b_bits, tmp);
for (unsigned j = 0; j < (sz - i); j++)
out_bits.set(i+j, tmp.get(j)); // do not use [], it does not work on Linux.
}
last = now;
}
TRACE("bit_blaster_tpl_booth", for (unsigned i=0; i<out_bits.size(); i++)
tout << "Booth encoding: " << mk_pp(out_bits[i].get(), m()) << "\n"; );
SASSERT(out_bits.size() == sz);
return true;
}