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This commit is contained in:
Eddie Hung 2019-03-15 19:13:40 -07:00
parent e7ef7fa443
commit 06f8f2654a
3 changed files with 470 additions and 310 deletions
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655
passes/techmap/shregmap.cc
View File

@ -26,7 +26,9 @@ PRIVATE_NAMESPACE_BEGIN
struct ShregmapTech
{
virtual ~ShregmapTech() { }
virtual bool analyze(vector<int> &taps) = 0;
virtual void init(const Module * /*module*/, const SigMap &/*sigmap*/) {}
virtual void non_chain_user(const SigBit &/*bit*/, const Cell* /*cell*/, IdString /*port*/) {}
virtual bool analyze(vector<int> &taps, const vector<SigBit> &qbits) = 0;
virtual bool fixup(Cell *cell, dict<int, SigBit> &taps) = 0;
};
@ -54,7 +56,7 @@ struct ShregmapOptions
struct ShregmapTechGreenpak4 : ShregmapTech
{
bool analyze(vector<int> &taps)
bool analyze(vector<int> &taps, const vector<SigBit> &/*qbits*/)
{
if (GetSize(taps) > 2 && taps[0] == 0 && taps[2] < 17) {
taps.clear();
@ -91,302 +93,423 @@ struct ShregmapTechGreenpak4 : ShregmapTech
}
};
struct ShregmapTechXilinx7 : ShregmapTech
{
dict<SigBit, Cell*> sigbit_to_shiftx;
const ShregmapOptions &opts;
ShregmapTechXilinx7(const ShregmapOptions &opts) : opts(opts) {}
virtual void init(const Module* module, const SigMap &sigmap) override
{
for (auto i : module->cells_) {
auto cell = i.second;
if (cell->type != "$shiftx") continue;
if (cell->getParam("\\Y_WIDTH") != 1) continue;
for (auto bit : sigmap(cell->getPort("\\A")))
sigbit_to_shiftx[bit] = cell;
}
}
virtual void non_chain_user(const SigBit &bit, const Cell *cell, IdString port) override
{
auto it = sigbit_to_shiftx.find(bit);
if (it == sigbit_to_shiftx.end())
return;
if (cell->type == "$shiftx" && port == "\\A")
return;
it->second = nullptr;
}
virtual bool analyze(vector<int> &taps, const vector<SigBit> &qbits) override
{
if (GetSize(taps) == 1)
return taps[0] >= opts.minlen-1;
if (taps.back() < opts.minlen-1)
return false;
Cell *shiftx = nullptr;
int offset = 0;
for (int i = 0; i < GetSize(taps); ++i) {
// Check taps are sequential
if (i != taps[i])
return false;
// Check taps are not connected to a shift register,
// or sequential to the same shift register
auto it = sigbit_to_shiftx.find(qbits[i]);
if (i == 0) {
if (it != sigbit_to_shiftx.end()) {
shiftx = it->second;
// NULL indicates there are non-shiftx users
if (shiftx == nullptr)
return false;
offset = qbits[i].offset;
}
}
else {
if (it == sigbit_to_shiftx.end()) {
if (shiftx != nullptr)
return false;
}
else {
if (shiftx != it->second)
return false;
if (qbits[i].offset != offset + i)
return false;
}
}
}
return true;
}
virtual bool fixup(Cell *cell, dict<int, SigBit> &taps) override
{
const auto &tap = *taps.begin();
auto bit = tap.second;
auto it = sigbit_to_shiftx.find(bit);
if (it == sigbit_to_shiftx.end())
return true;
Cell* shiftx = it->second;
auto module = cell->module;
auto cell_q = cell->getPort("\\Q").as_bit();
auto shiftx_a = shiftx->getPort("\\A").bits();
int offset = 0;
for (auto bit : shiftx_a) {
if (bit == cell_q)
break;
++offset;
}
offset -= taps.size() - 1;
log_assert(offset >= 0);
for (size_t i = offset; i < offset + taps.size(); ++i)
shiftx_a[i] = cell_q;
// FIXME: Hack to ensure that $shiftx gets optimised away
// Without this, Yosys will refuse to optimise away a $shiftx
// where \\A 's width is not perfectly \\B_WIDTH ** 2
auto shiftx_bwidth = shiftx->getParam("\\B_WIDTH").as_int();
shiftx_a.resize(1 << shiftx_bwidth, shiftx_a.back());
shiftx->setPort("\\A", shiftx_a);
shiftx->setParam("\\A_WIDTH", shiftx_a.size());
auto length = module->addWire(NEW_ID, ceil(log2(taps.size())));
module->addSub(NEW_ID, shiftx->getPort("\\B"), RTLIL::Const(offset, ceil(log2(offset))), length);
cell->setPort("\\L", length);
return true;
}
};
struct ShregmapWorker
{
Module *module;
SigMap sigmap;
Module *module;
SigMap sigmap;
const ShregmapOptions &opts;
int dff_count, shreg_count;
const ShregmapOptions &opts;
int dff_count, shreg_count;
pool<Cell*> remove_cells;
pool<SigBit> remove_init;
pool<Cell*> remove_cells;
pool<SigBit> remove_init;
dict<SigBit, bool> sigbit_init;
dict<SigBit, Cell*> sigbit_chain_next;
dict<SigBit, Cell*> sigbit_chain_prev;
pool<SigBit> sigbit_with_non_chain_users;
pool<Cell*> chain_start_cells;
dict<SigBit, bool> sigbit_init;
dict<SigBit, Cell*> sigbit_chain_next;
dict<SigBit, Cell*> sigbit_chain_prev;
pool<SigBit> sigbit_with_non_chain_users;
pool<Cell*> chain_start_cells;
void make_sigbit_chain_next_prev()
void make_sigbit_chain_next_prev()
{
for (auto wire : module->wires())
{
for (auto wire : module->wires())
{
if (wire->port_output || wire->get_bool_attribute("\\keep")) {
for (auto bit : sigmap(wire))
sigbit_with_non_chain_users.insert(bit);
}
if (wire->port_output || wire->get_bool_attribute("\\keep")) {
for (auto bit : sigmap(wire))
sigbit_with_non_chain_users.insert(bit);
}
if (wire->attributes.count("\\init")) {
SigSpec initsig = sigmap(wire);
Const initval = wire->attributes.at("\\init");
for (int i = 0; i < GetSize(initsig) && i < GetSize(initval); i++)
if (initval[i] == State::S0 && !opts.zinit)
sigbit_init[initsig[i]] = false;
else if (initval[i] == State::S1)
sigbit_init[initsig[i]] = true;
}
}
for (auto cell : module->cells())
{
if (opts.ffcells.count(cell->type) && !cell->get_bool_attribute("\\keep"))
{
IdString d_port = opts.ffcells.at(cell->type).first;
IdString q_port = opts.ffcells.at(cell->type).second;
SigBit d_bit = sigmap(cell->getPort(d_port).as_bit());
SigBit q_bit = sigmap(cell->getPort(q_port).as_bit());
if (opts.init || sigbit_init.count(q_bit) == 0)
{
if (sigbit_chain_next.count(d_bit)) {
sigbit_with_non_chain_users.insert(d_bit);
} else
sigbit_chain_next[d_bit] = cell;
sigbit_chain_prev[q_bit] = cell;
continue;
}
}
for (auto conn : cell->connections())
if (cell->input(conn.first))
for (auto bit : sigmap(conn.second))
sigbit_with_non_chain_users.insert(bit);
}
if (wire->attributes.count("\\init")) {
SigSpec initsig = sigmap(wire);
Const initval = wire->attributes.at("\\init");
for (int i = 0; i < GetSize(initsig) && i < GetSize(initval); i++)
if (initval[i] == State::S0 && !opts.zinit)
sigbit_init[initsig[i]] = false;
else if (initval[i] == State::S1)
sigbit_init[initsig[i]] = true;
}
}
void find_chain_start_cells()
for (auto cell : module->cells())
{
for (auto it : sigbit_chain_next)
if (opts.ffcells.count(cell->type) && !cell->get_bool_attribute("\\keep"))
{
IdString d_port = opts.ffcells.at(cell->type).first;
IdString q_port = opts.ffcells.at(cell->type).second;
SigBit d_bit = sigmap(cell->getPort(d_port).as_bit());
SigBit q_bit = sigmap(cell->getPort(q_port).as_bit());
if (opts.init || sigbit_init.count(q_bit) == 0)
{
if (opts.tech == nullptr && sigbit_with_non_chain_users.count(it.first))
goto start_cell;
if (sigbit_chain_next.count(d_bit)) {
sigbit_with_non_chain_users.insert(d_bit);
} else
sigbit_chain_next[d_bit] = cell;
if (sigbit_chain_prev.count(it.first) != 0)
{
Cell *c1 = sigbit_chain_prev.at(it.first);
Cell *c2 = it.second;
if (c1->type != c2->type)
goto start_cell;
if (c1->parameters != c2->parameters)
goto start_cell;
IdString d_port = opts.ffcells.at(c1->type).first;
IdString q_port = opts.ffcells.at(c1->type).second;
auto c1_conn = c1->connections();
auto c2_conn = c1->connections();
c1_conn.erase(d_port);
c1_conn.erase(q_port);
c2_conn.erase(d_port);
c2_conn.erase(q_port);
if (c1_conn != c2_conn)
goto start_cell;
continue;
}
start_cell:
chain_start_cells.insert(it.second);
sigbit_chain_prev[q_bit] = cell;
continue;
}
}
for (auto conn : cell->connections())
if (cell->input(conn.first))
for (auto bit : sigmap(conn.second)) {
sigbit_with_non_chain_users.insert(bit);
if (opts.tech) opts.tech->non_chain_user(bit, cell, conn.first);
}
}
}
void find_chain_start_cells()
{
for (auto it : sigbit_chain_next)
{
if (opts.tech == nullptr && sigbit_with_non_chain_users.count(it.first))
goto start_cell;
if (sigbit_chain_prev.count(it.first) != 0)
{
Cell *c1 = sigbit_chain_prev.at(it.first);
Cell *c2 = it.second;
if (c1->type != c2->type)
goto start_cell;
if (c1->parameters != c2->parameters)
goto start_cell;
IdString d_port = opts.ffcells.at(c1->type).first;
IdString q_port = opts.ffcells.at(c1->type).second;
auto c1_conn = c1->connections();
auto c2_conn = c1->connections();
c1_conn.erase(d_port);
c1_conn.erase(q_port);
c2_conn.erase(d_port);
c2_conn.erase(q_port);
if (c1_conn != c2_conn)
goto start_cell;
continue;
}
start_cell:
chain_start_cells.insert(it.second);
}
}
vector<Cell*> create_chain(Cell *start_cell)
{
vector<Cell*> chain;
Cell *c = start_cell;
while (c != nullptr)
{
chain.push_back(c);
IdString q_port = opts.ffcells.at(c->type).second;
SigBit q_bit = sigmap(c->getPort(q_port).as_bit());
if (sigbit_chain_next.count(q_bit) == 0)
break;
c = sigbit_chain_next.at(q_bit);
if (chain_start_cells.count(c) != 0)
break;
}
vector<Cell*> create_chain(Cell *start_cell)
{
vector<Cell*> chain;
return chain;
}
Cell *c = start_cell;
while (c != nullptr)
void process_chain(vector<Cell*> &chain)
{
if (GetSize(chain) < opts.keep_before + opts.minlen + opts.keep_after)
return;
int cursor = opts.keep_before;
while (cursor < GetSize(chain) - opts.keep_after)
{
int depth = GetSize(chain) - opts.keep_after - cursor;
if (opts.maxlen > 0)
depth = std::min(opts.maxlen, depth);
Cell *first_cell = chain[cursor];
IdString q_port = opts.ffcells.at(first_cell->type).second;
dict<int, SigBit> taps_dict;
if (opts.tech)
{
vector<SigBit> qbits;
vector<int> taps;
for (int i = 0; i < depth; i++)
{
chain.push_back(c);
Cell *cell = chain[cursor+i];
auto qbit = sigmap(cell->getPort(q_port));
qbits.push_back(qbit);
IdString q_port = opts.ffcells.at(c->type).second;
SigBit q_bit = sigmap(c->getPort(q_port).as_bit());
if (sigbit_chain_next.count(q_bit) == 0)
break;
c = sigbit_chain_next.at(q_bit);
if (chain_start_cells.count(c) != 0)
break;
if (sigbit_with_non_chain_users.count(qbit))
taps.push_back(i);
}
return chain;
}
void process_chain(vector<Cell*> &chain)
{
if (GetSize(chain) < opts.keep_before + opts.minlen + opts.keep_after)
return;
int cursor = opts.keep_before;
while (cursor < GetSize(chain) - opts.keep_after)
while (depth > 0)
{
int depth = GetSize(chain) - opts.keep_after - cursor;
if (taps.empty() || taps.back() < depth-1)
taps.push_back(depth-1);
if (opts.maxlen > 0)
depth = std::min(opts.maxlen, depth);
if (opts.tech->analyze(taps, qbits))
break;
Cell *first_cell = chain[cursor];
IdString q_port = opts.ffcells.at(first_cell->type).second;
dict<int, SigBit> taps_dict;
if (opts.tech)
{
vector<SigBit> qbits;
vector<int> taps;
for (int i = 0; i < depth; i++)
{
Cell *cell = chain[cursor+i];
auto qbit = sigmap(cell->getPort(q_port));
qbits.push_back(qbit);
if (sigbit_with_non_chain_users.count(qbit))
taps.push_back(i);
}
while (depth > 0)
{
if (taps.empty() || taps.back() < depth-1)
taps.push_back(depth-1);
if (opts.tech->analyze(taps))
break;
taps.pop_back();
depth--;
}
depth = 0;
for (auto tap : taps) {
taps_dict[tap] = qbits.at(tap);
log_assert(depth < tap+1);
depth = tap+1;
}
}
if (depth < 2) {
cursor++;
continue;
}
Cell *last_cell = chain[cursor+depth-1];
log("Converting %s.%s ... %s.%s to a shift register with depth %d.\n",
log_id(module), log_id(first_cell), log_id(module), log_id(last_cell), depth);
dff_count += depth;
shreg_count += 1;
string shreg_cell_type_str = "$__SHREG";
if (opts.params) {
shreg_cell_type_str += "_";
} else {
if (first_cell->type[1] != '_')
shreg_cell_type_str += "_";
shreg_cell_type_str += first_cell->type.substr(1);
}
if (opts.init) {
vector<State> initval;
for (int i = depth-1; i >= 0; i--) {
SigBit bit = sigmap(chain[cursor+i]->getPort(q_port).as_bit());
if (sigbit_init.count(bit) == 0)
initval.push_back(State::Sx);
else if (sigbit_init.at(bit))
initval.push_back(State::S1);
else
initval.push_back(State::S0);
remove_init.insert(bit);
}
first_cell->setParam("\\INIT", initval);
}
if (opts.zinit)
for (int i = depth-1; i >= 0; i--) {
SigBit bit = sigmap(chain[cursor+i]->getPort(q_port).as_bit());
remove_init.insert(bit);
}
if (opts.params)
{
int param_clkpol = -1;
int param_enpol = 2;
if (first_cell->type == "$_DFF_N_") param_clkpol = 0;
if (first_cell->type == "$_DFF_P_") param_clkpol = 1;
if (first_cell->type == "$_DFFE_NN_") param_clkpol = 0, param_enpol = 0;
if (first_cell->type == "$_DFFE_NP_") param_clkpol = 0, param_enpol = 1;
if (first_cell->type == "$_DFFE_PN_") param_clkpol = 1, param_enpol = 0;
if (first_cell->type == "$_DFFE_PP_") param_clkpol = 1, param_enpol = 1;
log_assert(param_clkpol >= 0);
first_cell->setParam("\\CLKPOL", param_clkpol);
if (opts.ffe) first_cell->setParam("\\ENPOL", param_enpol);
}
first_cell->type = shreg_cell_type_str;
first_cell->setPort(q_port, last_cell->getPort(q_port));
first_cell->setParam("\\DEPTH", depth);
if (opts.tech != nullptr && !opts.tech->fixup(first_cell, taps_dict))
remove_cells.insert(first_cell);
for (int i = 1; i < depth; i++)
remove_cells.insert(chain[cursor+i]);
cursor += depth;
taps.pop_back();
depth--;
}
}
void cleanup()
depth = 0;
for (auto tap : taps) {
taps_dict[tap] = qbits.at(tap);
log_assert(depth < tap+1);
depth = tap+1;
}
}
if (depth < 2) {
cursor++;
continue;
}
Cell *last_cell = chain[cursor+depth-1];
log("Converting %s.%s ... %s.%s to a shift register with depth %d.\n",
log_id(module), log_id(first_cell), log_id(module), log_id(last_cell), depth);
dff_count += depth;
shreg_count += 1;
string shreg_cell_type_str = "$__SHREG";
if (opts.params) {
shreg_cell_type_str += "_";
} else {
if (first_cell->type[1] != '_')
shreg_cell_type_str += "_";
shreg_cell_type_str += first_cell->type.substr(1);
}
if (opts.init) {
vector<State> initval;
for (int i = depth-1; i >= 0; i--) {
SigBit bit = sigmap(chain[cursor+i]->getPort(q_port).as_bit());
if (sigbit_init.count(bit) == 0)
initval.push_back(State::Sx);
else if (sigbit_init.at(bit))
initval.push_back(State::S1);
else
initval.push_back(State::S0);
remove_init.insert(bit);
}
first_cell->setParam("\\INIT", initval);
}
if (opts.zinit)
for (int i = depth-1; i >= 0; i--) {
SigBit bit = sigmap(chain[cursor+i]->getPort(q_port).as_bit());
remove_init.insert(bit);
}
if (opts.params)
{
int param_clkpol = -1;
int param_enpol = 2;
if (first_cell->type == "$_DFF_N_") param_clkpol = 0;
if (first_cell->type == "$_DFF_P_") param_clkpol = 1;
if (first_cell->type == "$_DFFE_NN_") param_clkpol = 0, param_enpol = 0;
if (first_cell->type == "$_DFFE_NP_") param_clkpol = 0, param_enpol = 1;
if (first_cell->type == "$_DFFE_PN_") param_clkpol = 1, param_enpol = 0;
if (first_cell->type == "$_DFFE_PP_") param_clkpol = 1, param_enpol = 1;
log_assert(param_clkpol >= 0);
first_cell->setParam("\\CLKPOL", param_clkpol);
if (opts.ffe) first_cell->setParam("\\ENPOL", param_enpol);
}
first_cell->type = shreg_cell_type_str;
first_cell->setPort(q_port, last_cell->getPort(q_port));
if (!first_cell->hasPort("\\L"))
first_cell->setPort("\\L", depth-1);
first_cell->setParam("\\DEPTH", depth);
if (opts.tech != nullptr && !opts.tech->fixup(first_cell, taps_dict))
remove_cells.insert(first_cell);
for (int i = 1; i < depth; i++)
remove_cells.insert(chain[cursor+i]);
cursor += depth;
}
}
void cleanup()
{
for (auto cell : remove_cells)
module->remove(cell);
for (auto wire : module->wires())
{
for (auto cell : remove_cells)
module->remove(cell);
if (wire->attributes.count("\\init") == 0)
continue;
for (auto wire : module->wires())
{
if (wire->attributes.count("\\init") == 0)
continue;
SigSpec initsig = sigmap(wire);
Const &initval = wire->attributes.at("\\init");
SigSpec initsig = sigmap(wire);
Const &initval = wire->attributes.at("\\init");
for (int i = 0; i < GetSize(initsig) && i < GetSize(initval); i++)
if (remove_init.count(initsig[i]))
initval[i] = State::Sx;
for (int i = 0; i < GetSize(initsig) && i < GetSize(initval); i++)
if (remove_init.count(initsig[i]))
initval[i] = State::Sx;
if (SigSpec(initval).is_fully_undef())
wire->attributes.erase("\\init");
}
remove_cells.clear();
sigbit_chain_next.clear();
sigbit_chain_prev.clear();
chain_start_cells.clear();
if (SigSpec(initval).is_fully_undef())
wire->attributes.erase("\\init");
}
ShregmapWorker(Module *module, const ShregmapOptions &opts) :
module(module), sigmap(module), opts(opts), dff_count(0), shreg_count(0)
{
make_sigbit_chain_next_prev();
find_chain_start_cells();
remove_cells.clear();
sigbit_chain_next.clear();
sigbit_chain_prev.clear();
chain_start_cells.clear();
}
for (auto c : chain_start_cells) {
vector<Cell*> chain = create_chain(c);
process_chain(chain);
}
ShregmapWorker(Module *module, const ShregmapOptions &opts) :
module(module), sigmap(module), opts(opts), dff_count(0), shreg_count(0)
{
if (opts.tech)
opts.tech->init(module, sigmap);
cleanup();
make_sigbit_chain_next_prev();
find_chain_start_cells();
for (auto c : chain_start_cells) {
vector<Cell*> chain = create_chain(c);
process_chain(chain);
}
cleanup();
}
};
struct ShregmapPass : public Pass {
@ -501,6 +624,12 @@ struct ShregmapPass : public Pass {
clkpol = "pos";
opts.zinit = true;
opts.tech = new ShregmapTechGreenpak4;
}
else if (tech == "xilinx") {
opts.init = true;
opts.params = true;
enpol = "any_or_none";
opts.tech = new ShregmapTechXilinx7(opts);
} else {
argidx--;
break;

109
techlibs/xilinx/cells_map.v
View File

@ -17,7 +17,7 @@
*
*/
module \$__SHREG_ (input C, input D, input E, output Q);
module \$__SHREG_ (input C, input D, input [31:0] L, input E, output Q);
parameter DEPTH = 0;
parameter [DEPTH-1:0] INIT = 0;
parameter CLKPOL = 1;
@ -36,6 +36,9 @@ module \$__SHREG_ (input C, input D, input E, output Q);
endfunction
localparam [DEPTH-1:0] INIT_R = brev(INIT);
parameter _TECHMAP_CONSTMSK_L_ = 0;
parameter _TECHMAP_CONSTVAL_L_ = 0;
generate
if (ENPOL == 0)
assign CE = ~E;
@ -44,60 +47,86 @@ module \$__SHREG_ (input C, input D, input E, output Q);
else
assign CE = 1'b1;
if (DEPTH == 1) begin
if (CLKPOL)
FDRE #(.INIT(INIT_R)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0));
else
FDRE_1 #(.INIT(INIT_R)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0));
wire _TECHMAP_FAIL_ = ~&_TECHMAP_CONSTMSK_L_ || _TECHMAP_CONSTVAL_L_ != 0;
if (CLKPOL)
FDRE #(.INIT(INIT_R)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0));
else
FDRE_1 #(.INIT(INIT_R)) _TECHMAP_REPLACE_ (.D(D), .Q(Q), .C(C), .CE(CE), .R(1'b0));
end else
if (DEPTH <= 16) begin
localparam [3:0] A = DEPTH - 1;
SRL16E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A0(A[0]), .A1(A[1]), .A2(A[2]), .A3(A[3]), .CE(CE), .CLK(C), .D(D), .Q(Q));
SRL16E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A0(L[0]), .A1(L[1]), .A2(L[2]), .A3(L[3]), .CE(CE), .CLK(C), .D(D), .Q(Q));
end else
if (DEPTH > 17 && DEPTH <= 32) begin
SRLC32E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A(DEPTH-1), .CE(CE), .CLK(C), .D(D), .Q(Q));
SRLC32E #(.INIT(INIT_R), .IS_CLK_INVERTED(~CLKPOL[0])) _TECHMAP_REPLACE_ (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(Q));
end else
if (DEPTH > 33 && DEPTH <= 64) begin
wire T0, T1, T2;
localparam [5:0] A = DEPTH-1;
SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
\$__SHREG_ #(.DEPTH(DEPTH-32), .INIT(INIT[DEPTH-32-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T1), .E(E), .Q(T2));
MUXF7 fpga_mux_0 (.O(Q), .I0(T0), .I1(T2), .S(A[5]));
SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
\$__SHREG_ #(.DEPTH(DEPTH-32), .INIT(INIT[DEPTH-32-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T1), .L(L), .E(E), .Q(T2));
if (&_TECHMAP_CONSTMSK_L_)
assign Q = T2;
else
MUXF7 fpga_mux_0 (.O(Q), .I0(T0), .I1(T2), .S(L[5]));
end else
if (DEPTH > 65 && DEPTH <= 96) begin
localparam [6:0] A = DEPTH-1;
wire T0, T1, T2, T3, T4, T5, T6;
SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
SRLC32E #(.INIT(INIT_R[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(A[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3));
\$__SHREG_ #(.DEPTH(DEPTH-64), .INIT(INIT[DEPTH-64-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_2 (.C(C), .D(T3), .E(E), .Q(T4));
MUXF7 fpga_mux_0 (.O(T5), .I0(T0), .I1(T2), .S(A[5]));
MUXF7 fpga_mux_1 (.O(T6), .I0(T4), .I1(1'b0 /* unused */), .S(A[5]));
MUXF8 fpga_mux_2 (.O(Q), .I0(T5), .I1(T6), .S(A[6]));
SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
SRLC32E #(.INIT(INIT_R[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(L[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3));
\$__SHREG_ #(.DEPTH(DEPTH-64), .INIT(INIT[DEPTH-64-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_2 (.C(C), .D(T3), .L(L[4:0]), .E(E), .Q(T4));
if (&_TECHMAP_CONSTMSK_L_)
assign Q = T4;
else begin
MUXF7 fpga_mux_0 (.O(T5), .I0(T0), .I1(T2), .S(L[5]));
MUXF7 fpga_mux_1 (.O(T6), .I0(T4), .I1(1'b0 /* unused */), .S(L[5]));
MUXF8 fpga_mux_2 (.O(Q), .I0(T5), .I1(T6), .S(L[6]));
end
end else
if (DEPTH > 97 && DEPTH <= 128) begin
localparam [6:0] A = DEPTH-1;
wire T0, T1, T2, T3, T4, T5, T6, T7, T8;
SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(A[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
SRLC32E #(.INIT(INIT_R[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(A[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3));
SRLC32E #(.INIT(INIT_R[96-1:64]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_2 (.A(A[4:0]), .CE(CE), .CLK(C), .D(T3), .Q(T4), .Q31(T5));
\$__SHREG_ #(.DEPTH(DEPTH-96), .INIT(INIT[DEPTH-96-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_3 (.C(C), .D(T5), .E(E), .Q(T6));
MUXF7 fpga_mux_0 (.O(T7), .I0(T0), .I1(T2), .S(A[5]));
MUXF7 fpga_mux_1 (.O(T8), .I0(T4), .I1(T6), .S(A[5]));
MUXF8 fpga_mux_2 (.O(Q), .I0(T7), .I1(T8), .S(A[6]));
SRLC32E #(.INIT(INIT_R[32-1:0]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_0 (.A(L[4:0]), .CE(CE), .CLK(C), .D(D), .Q(T0), .Q31(T1));
SRLC32E #(.INIT(INIT_R[64-1:32]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_1 (.A(L[4:0]), .CE(CE), .CLK(C), .D(T1), .Q(T2), .Q31(T3));
SRLC32E #(.INIT(INIT_R[96-1:64]), .IS_CLK_INVERTED(~CLKPOL[0])) fpga_srl_2 (.A(L[4:0]), .CE(CE), .CLK(C), .D(T3), .Q(T4), .Q31(T5));
\$__SHREG_ #(.DEPTH(DEPTH-96), .INIT(INIT[DEPTH-96-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_3 (.C(C), .D(T5), .L(L[4:0]), .E(E), .Q(T6));
if (&_TECHMAP_CONSTMSK_L_)
assign Q = T6;
else begin
MUXF7 fpga_mux_0 (.O(T7), .I0(T0), .I1(T2), .S(L[5]));
MUXF7 fpga_mux_1 (.O(T8), .I0(T4), .I1(T6), .S(L[5]));
MUXF8 fpga_mux_2 (.O(Q), .I0(T7), .I1(T8), .S(L[6]));
end
end
else if (DEPTH <= 129) begin
else if (DEPTH < 129 || (DEPTH <= 129 && &_TECHMAP_CONSTMSK_L_)) begin
// Handle cases where depth is just 1 over a convenient value,
// in which case use the flop
wire T0;
\$__SHREG_ #(.DEPTH(DEPTH-1), .INIT(INIT[DEPTH-1:1]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .E(E), .Q(T0));
\$__SHREG_ #(.DEPTH(1), .INIT(INIT[0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .E(E), .Q(Q));
end else
begin
// UG474 (v1.8, p34) states that:
// "There are no direct connections between slices to form longer shift
// registers, nor is the MC31 output at LUT B/C/D available."
wire T0;
\$__SHREG_ #(.DEPTH(128), .INIT(INIT[DEPTH-1:DEPTH-128]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .E(E), .Q(T0));
\$__SHREG_ #(.DEPTH(DEPTH-128), .INIT(INIT[DEPTH-128-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .E(E), .Q(Q));
if (&_TECHMAP_CONSTMSK_L_) begin
// For constant length, use the flop
wire T0;
\$__SHREG_ #(.DEPTH(DEPTH-1), .INIT(INIT[DEPTH-1:1]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .L(DEPTH-1-1), .E(E), .Q(T0));
\$__SHREG_ #(.DEPTH(1), .INIT(INIT[0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .L(0), .E(E), .Q(Q));
end
else begin
// For variable length, bump up to the next length
// because we can't access Q31
\$__SHREG_ #(.DEPTH(DEPTH+1), .INIT(INIT), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) _TECHMAP_REPLACE_ (.C(C), .D(D), .L(L), .E(E), .Q(Q));
end
end
else begin
if (&_TECHMAP_CONSTMSK_L_) begin
// UG474 (v1.8, p34) states that:
// "There are no direct connections between slices to form longer shift
// registers, nor is the MC31 output at LUT B/C/D available."
wire T0;
\$__SHREG_ #(.DEPTH(128), .INIT(INIT[DEPTH-1:DEPTH-128]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_0 (.C(C), .D(D), .L(127), .E(E), .Q(T0));
\$__SHREG_ #(.DEPTH(DEPTH-128), .INIT(INIT[DEPTH-128-1:0]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl_1 (.C(C), .D(T0), .L(DEPTH-1-128), .E(E), .Q(Q));
end
else begin
// No way to create variable length shift registers >128 bits as Q31
// cannot be output to the fabric...
wire [DEPTH-1:-1] c;
genvar i;
for (i = 0; i < DEPTH; i=i+1)
\$__SHREG_ #(.DEPTH(1), .INIT(INIT_R[i]), .CLKPOL(CLKPOL), .ENPOL(ENPOL)) fpga_srl (.C(C), .D(c[i-1]), .L(0), .E(E), .Q(c[i]));
assign { c[-1], Q } = { D, c[L] };
end
end
endgenerate
endmodule

16
techlibs/xilinx/synth_xilinx.cc
View File

@ -110,9 +110,8 @@ struct SynthXilinxPass : public Pass
log(" dffsr2dff\n");
log(" dff2dffe\n");
log(" opt -full\n");
log(" techmap -map +/techmap.v -map +/xilinx/arith_map.v\n");
log(" shregmap -init -params -enpol any_or_none\n");
log(" techmap -map +/xilinx/ff_map.v\n");
log(" shregmap -tech xilinx\n");
log(" techmap -map +/techmap.v -map +/xilinx/arith_map.v +/xilinx/ff_map.v\n");
log(" opt -fast\n");
log("\n");
log(" map_luts:\n");
@ -256,14 +255,17 @@ struct SynthXilinxPass : public Pass
Pass::call(design, "dff2dffe");
Pass::call(design, "opt -full");
Pass::call(design, "simplemap t:$dff*");
Pass::call(design, "shregmap -tech xilinx");
Pass::call(design, "techmap -map +/xilinx/cells_map.v t:$__SHREG_");
Pass::call(design, "opt -fast");
if (vpr) {
Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY");
Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v -map +/xilinx/ff_map.v -D _EXPLICIT_CARRY");
} else {
Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v");
Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v -map +/xilinx/ff_map.v");
}
Pass::call(design, "shregmap -init -params -enpol any_or_none");
Pass::call(design, "techmap -map +/xilinx/ff_map.v");
Pass::call(design, "opt -fast");
}