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opt_expr: do not group by X, more fixes

This commit is contained in:
Eddie Hung 2020-04-23 18:15:07 -07:00
parent b84415094c
commit 90b71eb84b
3 changed files with 61 additions and 20 deletions
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77
passes/opt/opt_expr.cc
View File

@ -132,7 +132,7 @@ void replace_cell(SigMap &assign_map, RTLIL::Module *module, RTLIL::Cell *cell,
did_something = true;
}
bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutative, SigMap &sigmap)
bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutative, SigMap &sigmap, bool keepdc)
{
IdString b_name = cell->hasPort(ID::B) ? ID::B : ID::A;
@ -148,7 +148,7 @@ bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutativ
std::vector<RTLIL::SigBit> bits_a = sig_a, bits_b = sig_b, bits_y = sig_y;
enum { GRP_DYN, GRP_CONST_A, GRP_CONST_B, GRP_CONST_AB, GRP_CONST_X, GRP_N };
enum { GRP_DYN, GRP_CONST_A, GRP_CONST_B, GRP_CONST_AB, GRP_N };
std::map<std::pair<RTLIL::SigBit, RTLIL::SigBit>, std::set<RTLIL::SigBit>> grouped_bits[GRP_N];
for (int i = 0; i < GetSize(bits_y); i++)
@ -162,14 +162,16 @@ bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutativ
if (cell->type == ID($and) && (bit_a == RTLIL::State::S0 || bit_b == RTLIL::State::S0))
bit_a = bit_b = RTLIL::State::S0;
if (bit_a.wire == NULL && bit_b.wire == NULL)
group_idx = GRP_CONST_AB;
else if (bit_a.wire == NULL)
group_idx = (bit_a == State::S0 || bit_a == State::S1 ? GRP_CONST_A : GRP_CONST_X);
else if (bit_b.wire == NULL && commutative)
group_idx = (bit_b == State::S0 || bit_b == State::S1 ? GRP_CONST_A : GRP_CONST_X), std::swap(bit_a, bit_b);
else if (bit_b.wire == NULL)
group_idx = GRP_CONST_B;
if (!keepdc || (bit_a != State::Sx && bit_a != State::Sz && bit_a != State::Sx && bit_a != State::Sx)) {
if (bit_a.wire == NULL && bit_b.wire == NULL)
group_idx = GRP_CONST_AB;
else if (bit_a.wire == NULL)
group_idx = GRP_CONST_A;
else if (bit_b.wire == NULL && commutative)
group_idx = GRP_CONST_A, std::swap(bit_a, bit_b);
else if (bit_b.wire == NULL)
group_idx = GRP_CONST_B;
}
grouped_bits[group_idx][std::pair<RTLIL::SigBit, RTLIL::SigBit>(bit_a, bit_b)].insert(bits_y[i]);
}
@ -186,26 +188,64 @@ bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutativ
if (grouped_bits[i].empty())
continue;
RTLIL::Wire *new_y = module->addWire(NEW_ID, GetSize(grouped_bits[i]));
RTLIL::SigSpec new_y = module->addWire(NEW_ID, GetSize(grouped_bits[i]));
RTLIL::SigSpec new_a, new_b;
RTLIL::SigSig new_conn;
for (auto &it : grouped_bits[i]) {
for (auto &bit : it.second) {
new_conn.first.append(bit);
new_conn.second.append(RTLIL::SigBit(new_y, new_a.size()));
new_conn.second.append(new_y[new_a.size()]);
}
new_a.append(it.first.first);
new_b.append(it.first.second);
}
if (cell->type.in(ID($and), ID($or)) && i == GRP_CONST_A) {
if (cell->type == ID($and))
new_a.replace(dict<SigBit,SigBit>{{State::Sx, State::S0}, {State::Sz, State::S0}}, &new_b);
else if (cell->type == ID($or))
new_a.replace(dict<SigBit,SigBit>{{State::Sx, State::S1}, {State::Sz, State::S1}}, &new_b);
else log_abort();
log_debug(" Direct Connection: %s (%s with %s)\n", log_signal(new_b), log_id(cell->type), log_signal(new_a));
module->connect(new_y, new_b);
module->connect(new_conn);
continue;
}
if (!keepdc && cell->type.in(ID($xor), ID($xnor)) && i == GRP_CONST_A) {
SigSpec undef_a, undef_y, undef_b;
SigSpec def_y, def_a, def_b;
for (int i = 0; i < GetSize(new_y); i++)
if (new_a[i] == State::Sx || new_a[i] == State::Sz) {
undef_a.append(new_a[i]);
if (cell->type == ID($xor))
undef_b.append(State::S0);
// For consistency with gate-level which does $xnor -> $_XOR_ + $_NOT_
else if (cell->type == ID($xnor))
undef_b.append(State::S1);
else log_abort();
undef_y.append(new_y[i]);
}
else {
def_a.append(new_a[i]);
def_b.append(new_b[i]);
def_y.append(new_y[i]);
}
if (!undef_y.empty()) {
log_debug(" Direct Connection: %s (%s with %s)\n", log_signal(undef_b), log_id(cell->type), log_signal(undef_a));
module->connect(undef_y, undef_b);
}
if (def_y.empty()) {
module->connect(new_conn);
continue;
}
new_a = std::move(def_a);
new_b = std::move(def_b);
new_y = std::move(def_y);
}
RTLIL::Cell *c = module->addCell(NEW_ID, cell->type);
c->setPort(ID::A, new_a);
@ -219,7 +259,7 @@ bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutativ
}
c->setPort(ID::Y, new_y);
c->parameters[ID::Y_WIDTH] = new_y->width;
c->parameters[ID::Y_WIDTH] = GetSize(new_y);
c->check();
module->connect(new_conn);
@ -499,7 +539,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
{
SigBit sig_a = assign_map(cell->getPort(ID::A));
SigBit sig_b = assign_map(cell->getPort(ID::B));
if (sig_a == sig_b) {
if (!keepdc && (sig_a == sig_b || sig_a == State::Sx || sig_a == State::Sz || sig_b == State::Sx || sig_b == State::Sz)) {
if (cell->type.in(ID($xor), ID($_XOR_))) {
cover("opt.opt_expr.const_xor");
replace_cell(assign_map, module, cell, "const_xor", ID::Y, RTLIL::State::S0);
@ -507,6 +547,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
}
if (cell->type.in(ID($xnor), ID($_XNOR_))) {
cover("opt.opt_expr.const_xnor");
// For consistency with gate-level which does $xnor -> $_XOR_ + $_NOT_
replace_cell(assign_map, module, cell, "const_xnor", ID::Y, RTLIL::State::S1);
goto next_cell;
}
@ -515,7 +556,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
if (!sig_a.wire)
std::swap(sig_a, sig_b);
if (!sig_b.wire && (sig_b == State::S0 || sig_b == State::S1 || !keepdc)) {
if (sig_b == State::S0 || sig_b == State::S1) {
if (cell->type.in(ID($xor), ID($_XOR_))) {
cover("opt.opt_expr.xor_buffer");
SigSpec sig_y;
@ -564,7 +605,7 @@ void replace_const_cells(RTLIL::Design *design, RTLIL::Module *module, bool cons
if (do_fine)
{
if (cell->type.in(ID($not), ID($pos), ID($and), ID($or), ID($xor), ID($xnor)))
if (group_cell_inputs(module, cell, true, assign_map))
if (group_cell_inputs(module, cell, true, assign_map, keepdc))
goto next_cell;
if (cell->type.in(ID($logic_not), ID($logic_and), ID($logic_or), ID($reduce_or), ID($reduce_and), ID($reduce_bool)))
@ -895,8 +936,8 @@ skip_fine_alu:
if (input.match("10")) ACTION_DO_Y(1);
if (input.match("11")) ACTION_DO_Y(0);
if (!keepdc) {
if (input.match(" *")) ACTION_DO(ID::Y, input.extract(0, 1));
if (input.match("* ")) ACTION_DO(ID::Y, input.extract(1, 1));
if (input.match(" *")) ACTION_DO_Y(0);
if (input.match("* ")) ACTION_DO_Y(0);
}
}

2
tests/opt/opt_expr_xnor.ys
View File

@ -80,6 +80,6 @@ select -assert-count t c:$_XOR_
cd
miter -equiv -flatten -make_assert -make_outputs gold coarse_keepdc miter3
sat -verify -prove-asserts -show-ports -enable_undef -set-def in_i miter3
sat -verify -prove-asserts -show-ports -enable_undef miter3
miter -equiv -flatten -make_assert -make_outputs coarse_keepdc fine_keepdc miter4
sat -verify -prove-asserts -show-ports -enable_undef miter4

2
tests/opt/opt_expr_xor.ys
View File

@ -136,6 +136,6 @@ select -assert-count t c:$_XOR_
cd
miter -equiv -flatten -make_assert -make_outputs gold coarse_keepdc miter3
sat -verify -prove-asserts -show-ports -enable_undef -set-def in_i miter3
sat -verify -prove-asserts -show-ports -enable_undef miter3
miter -equiv -flatten -make_assert -make_outputs coarse_keepdc fine_keepdc miter4
sat -verify -prove-asserts -show-ports -enable_undef miter4