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iopadmap: Refactor and fix tristate buffer mapping. (#1527)

Browse source 
The previous code for rerouting wires when inserting tristate buffers
was overcomplicated and didn't handle all cases correctly (in
particular, only cell connections were rewired — internal connections
were not).
This commit is contained in:
Marcin Kościelnicki 2019-12-04 08:44:08 +01:00 • committed by GitHub
parent 10014e2643
commit 2abe38e73e
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 196 additions and 146 deletions
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243
passes/techmap/iopadmap.cc
View file

@ -87,11 +87,11 @@ struct IopadmapPass : public Pass {
{
log_header(design, "Executing IOPADMAP pass (mapping inputs/outputs to IO-PAD cells).\n");
std::string inpad_celltype, inpad_portname, inpad_portname2;
std::string outpad_celltype, outpad_portname, outpad_portname2;
std::string inoutpad_celltype, inoutpad_portname, inoutpad_portname2;
std::string toutpad_celltype, toutpad_portname, toutpad_portname2, toutpad_portname3;
std::string tinoutpad_celltype, tinoutpad_portname, tinoutpad_portname2, tinoutpad_portname3, tinoutpad_portname4;
std::string inpad_celltype, inpad_portname_o, inpad_portname_pad;
std::string outpad_celltype, outpad_portname_i, outpad_portname_pad;
std::string inoutpad_celltype, inoutpad_portname_io, inoutpad_portname_pad;
std::string toutpad_celltype, toutpad_portname_oe, toutpad_portname_i, toutpad_portname_pad;
std::string tinoutpad_celltype, tinoutpad_portname_oe, tinoutpad_portname_o, tinoutpad_portname_i, tinoutpad_portname_pad;
std::string widthparam, nameparam;
pool<pair<IdString, IdString>> ignore;
bool flag_bits = false;
@ -102,35 +102,35 @@ struct IopadmapPass : public Pass {
std::string arg = args[argidx];
if (arg == "-inpad" && argidx+2 < args.size()) {
inpad_celltype = args[++argidx];
inpad_portname = args[++argidx];
split_portname_pair(inpad_portname, inpad_portname2);
inpad_portname_o = args[++argidx];
split_portname_pair(inpad_portname_o, inpad_portname_pad);
continue;
}
if (arg == "-outpad" && argidx+2 < args.size()) {
outpad_celltype = args[++argidx];
outpad_portname = args[++argidx];
split_portname_pair(outpad_portname, outpad_portname2);
outpad_portname_i = args[++argidx];
split_portname_pair(outpad_portname_i, outpad_portname_pad);
continue;
}
if (arg == "-inoutpad" && argidx+2 < args.size()) {
inoutpad_celltype = args[++argidx];
inoutpad_portname = args[++argidx];
split_portname_pair(inoutpad_portname, inoutpad_portname2);
inoutpad_portname_io = args[++argidx];
split_portname_pair(inoutpad_portname_io, inoutpad_portname_pad);
continue;
}
if (arg == "-toutpad" && argidx+2 < args.size()) {
toutpad_celltype = args[++argidx];
toutpad_portname = args[++argidx];
split_portname_pair(toutpad_portname, toutpad_portname2);
split_portname_pair(toutpad_portname2, toutpad_portname3);
toutpad_portname_oe = args[++argidx];
split_portname_pair(toutpad_portname_oe, toutpad_portname_i);
split_portname_pair(toutpad_portname_i, toutpad_portname_pad);
continue;
}
if (arg == "-tinoutpad" && argidx+2 < args.size()) {
tinoutpad_celltype = args[++argidx];
tinoutpad_portname = args[++argidx];
split_portname_pair(tinoutpad_portname, tinoutpad_portname2);
split_portname_pair(tinoutpad_portname2, tinoutpad_portname3);
split_portname_pair(tinoutpad_portname3, tinoutpad_portname4);
tinoutpad_portname_oe = args[++argidx];
split_portname_pair(tinoutpad_portname_oe, tinoutpad_portname_o);
split_portname_pair(tinoutpad_portname_o, tinoutpad_portname_i);
split_portname_pair(tinoutpad_portname_i, tinoutpad_portname_pad);
continue;
}
if (arg == "-ignore" && argidx+2 < args.size()) {
@ -161,16 +161,16 @@ struct IopadmapPass : public Pass {
}
extra_args(args, argidx, design);
if (!inpad_portname2.empty())
ignore.insert(make_pair(RTLIL::escape_id(inpad_celltype), RTLIL::escape_id(inpad_portname2)));
if (!outpad_portname2.empty())
ignore.insert(make_pair(RTLIL::escape_id(outpad_celltype), RTLIL::escape_id(outpad_portname2)));
if (!inoutpad_portname2.empty())
ignore.insert(make_pair(RTLIL::escape_id(inoutpad_celltype), RTLIL::escape_id(inoutpad_portname2)));
if (!toutpad_portname3.empty())
ignore.insert(make_pair(RTLIL::escape_id(toutpad_celltype), RTLIL::escape_id(toutpad_portname3)));
if (!tinoutpad_portname4.empty())
ignore.insert(make_pair(RTLIL::escape_id(tinoutpad_celltype), RTLIL::escape_id(tinoutpad_portname4)));
if (!inpad_portname_pad.empty())
ignore.insert(make_pair(RTLIL::escape_id(inpad_celltype), RTLIL::escape_id(inpad_portname_pad)));
if (!outpad_portname_pad.empty())
ignore.insert(make_pair(RTLIL::escape_id(outpad_celltype), RTLIL::escape_id(outpad_portname_pad)));
if (!inoutpad_portname_pad.empty())
ignore.insert(make_pair(RTLIL::escape_id(inoutpad_celltype), RTLIL::escape_id(inoutpad_portname_pad)));
if (!toutpad_portname_pad.empty())
ignore.insert(make_pair(RTLIL::escape_id(toutpad_celltype), RTLIL::escape_id(toutpad_portname_pad)));
if (!tinoutpad_portname_pad.empty())
ignore.insert(make_pair(RTLIL::escape_id(tinoutpad_celltype), RTLIL::escape_id(tinoutpad_portname_pad)));
for (auto module : design->modules())
if (module->get_blackbox_attribute())
@ -180,34 +180,25 @@ struct IopadmapPass : public Pass {
for (auto module : design->selected_modules())
{
dict<IdString, pool<int>> skip_wires;
pool<SigBit> skip_wire_bits;
SigMap sigmap(module);
dict<Wire *, dict<int, pair<Cell *, IdString>>> rewrite_bits;
for (auto cell : module->cells())
for (auto port : cell->connections())
if (ignore.count(make_pair(cell->type, port.first)))
for (auto bit : sigmap(port.second))
for (auto bit : port.second)
skip_wire_bits.insert(bit);
if (!toutpad_celltype.empty() || !tinoutpad_celltype.empty())
{
dict<SigBit, pair<IdString, pool<IdString>>> tbuf_bits;
pool<pair<IdString, IdString>> norewrites;
SigMap rewrites;
dict<SigBit, Cell *> tbuf_bits;
for (auto cell : module->cells())
if (cell->type == ID($_TBUF_)) {
SigBit bit = sigmap(cell->getPort(ID::Y).as_bit());
tbuf_bits[bit].first = cell->name;
SigBit bit = cell->getPort(ID::Y).as_bit();
tbuf_bits[bit] = cell;
}
for (auto cell : module->cells())
for (auto port : cell->connections())
for (auto bit : sigmap(port.second))
if (tbuf_bits.count(bit))
tbuf_bits.at(bit).second.insert(cell->name);
for (auto wire : module->selected_wires())
{
if (!wire->port_output)
@ -216,16 +207,11 @@ struct IopadmapPass : public Pass {
for (int i = 0; i < GetSize(wire); i++)
{
SigBit wire_bit(wire, i);
SigBit mapped_wire_bit = sigmap(wire_bit);
if (tbuf_bits.count(mapped_wire_bit) == 0)
if (tbuf_bits.count(wire_bit) == 0)
continue;
if (skip_wire_bits.count(mapped_wire_bit))
continue;
auto &tbuf_cache = tbuf_bits.at(mapped_wire_bit);
Cell *tbuf_cell = module->cell(tbuf_cache.first);
Cell *tbuf_cell = tbuf_bits.at(wire_bit);
if (tbuf_cell == nullptr)
continue;
@ -238,37 +224,16 @@ struct IopadmapPass : public Pass {
log("Mapping port %s.%s[%d] using %s.\n", log_id(module), log_id(wire), i, tinoutpad_celltype.c_str());
Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(tinoutpad_celltype));
Wire *owire = module->addWire(NEW_ID);
cell->setPort(RTLIL::escape_id(tinoutpad_portname), en_sig);
cell->setPort(RTLIL::escape_id(tinoutpad_portname2), owire);
cell->setPort(RTLIL::escape_id(tinoutpad_portname3), data_sig);
cell->setPort(RTLIL::escape_id(tinoutpad_portname4), wire_bit);
cell->setPort(RTLIL::escape_id(tinoutpad_portname_oe), en_sig);
cell->setPort(RTLIL::escape_id(tinoutpad_portname_o), wire_bit);
cell->setPort(RTLIL::escape_id(tinoutpad_portname_i), data_sig);
cell->attributes[ID::keep] = RTLIL::Const(1);
for (auto cn : tbuf_cache.second) {
auto c = module->cell(cn);
if (c == nullptr)
continue;
for (auto port : c->connections()) {
SigSpec sig = port.second;
bool newsig = false;
for (auto &bit : sig)
if (sigmap(bit) == mapped_wire_bit) {
bit = owire;
newsig = true;
}
if (newsig)
c->setPort(port.first, sig);
}
}
module->remove(tbuf_cell);
skip_wires[wire->name].insert(i);
norewrites.insert(make_pair(cell->name, RTLIL::escape_id(tinoutpad_portname4)));
rewrites.add(sigmap(wire_bit), owire);
skip_wire_bits.insert(wire_bit);
if (!tinoutpad_portname_pad.empty())
rewrite_bits[wire][i] = make_pair(cell, RTLIL::escape_id(tinoutpad_portname_pad));
continue;
}
@ -278,50 +243,19 @@ struct IopadmapPass : public Pass {
Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(toutpad_celltype));
cell->setPort(RTLIL::escape_id(toutpad_portname), en_sig);
cell->setPort(RTLIL::escape_id(toutpad_portname2), data_sig);
cell->setPort(RTLIL::escape_id(toutpad_portname3), wire_bit);
cell->setPort(RTLIL::escape_id(toutpad_portname_oe), en_sig);
cell->setPort(RTLIL::escape_id(toutpad_portname_i), data_sig);
cell->attributes[ID::keep] = RTLIL::Const(1);
for (auto cn : tbuf_cache.second) {
auto c = module->cell(cn);
if (c == nullptr)
continue;
for (auto port : c->connections()) {
SigSpec sig = port.second;
bool newsig = false;
for (auto &bit : sig)
if (sigmap(bit) == mapped_wire_bit) {
bit = data_sig;
newsig = true;
}
if (newsig)
c->setPort(port.first, sig);
}
}
module->remove(tbuf_cell);
skip_wires[wire->name].insert(i);
module->connect(wire_bit, data_sig);
skip_wire_bits.insert(wire_bit);
if (!toutpad_portname_pad.empty())
rewrite_bits[wire][i] = make_pair(cell, RTLIL::escape_id(toutpad_portname_pad));
continue;
}
}
}
if (GetSize(norewrites))
{
for (auto cell : module->cells())
for (auto port : cell->connections())
{
if (norewrites.count(make_pair(cell->name, port.first)))
continue;
SigSpec orig_sig = sigmap(port.second);
SigSpec new_sig = rewrites(orig_sig);
if (orig_sig != new_sig)
cell->setPort(port.first, new_sig);
}
}
}
for (auto wire : module->selected_wires())
@ -329,17 +263,11 @@ struct IopadmapPass : public Pass {
if (!wire->port_id)
continue;
std::string celltype, portname, portname2;
std::string celltype, portname_int, portname_pad;
pool<int> skip_bit_indices;
if (skip_wires.count(wire->name)) {
if (!flag_bits)
continue;
skip_bit_indices = skip_wires.at(wire->name);
}
for (int i = 0; i < GetSize(wire); i++)
if (skip_wire_bits.count(sigmap(SigBit(wire, i))))
if (skip_wire_bits.count(SigBit(wire, i)))
skip_bit_indices.insert(i);
if (GetSize(wire) == GetSize(skip_bit_indices))
@ -351,8 +279,8 @@ struct IopadmapPass : public Pass {
continue;
}
celltype = inpad_celltype;
portname = inpad_portname;
portname2 = inpad_portname2;
portname_int = inpad_portname_o;
portname_pad = inpad_portname_pad;
} else
if (!wire->port_input && wire->port_output) {
if (outpad_celltype.empty()) {
@ -360,8 +288,8 @@ struct IopadmapPass : public Pass {
continue;
}
celltype = outpad_celltype;
portname = outpad_portname;
portname2 = outpad_portname2;
portname_int = outpad_portname_i;
portname_pad = outpad_portname_pad;
} else
if (wire->port_input && wire->port_output) {
if (inoutpad_celltype.empty()) {
@ -369,8 +297,8 @@ struct IopadmapPass : public Pass {
continue;
}
celltype = inoutpad_celltype;
portname = inoutpad_portname;
portname2 = inoutpad_portname2;
portname_int = inoutpad_portname_io;
portname_pad = inoutpad_portname_pad;
} else
log_abort();
@ -381,29 +309,20 @@ struct IopadmapPass : public Pass {
log("Mapping port %s.%s using %s.\n", RTLIL::id2cstr(module->name), RTLIL::id2cstr(wire->name), celltype.c_str());
RTLIL::Wire *new_wire = NULL;
if (!portname2.empty()) {
new_wire = module->addWire(NEW_ID, wire);
module->swap_names(new_wire, wire);
wire->attributes.clear();
}
if (flag_bits)
{
for (int i = 0; i < wire->width; i++)
{
if (skip_bit_indices.count(i)) {
if (wire->port_output)
module->connect(SigSpec(new_wire, i), SigSpec(wire, i));
else
module->connect(SigSpec(wire, i), SigSpec(new_wire, i));
if (skip_bit_indices.count(i))
continue;
}
SigBit wire_bit(wire, i);
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(celltype));
cell->setPort(RTLIL::escape_id(portname), RTLIL::SigSpec(wire, i));
if (!portname2.empty())
cell->setPort(RTLIL::escape_id(portname2), RTLIL::SigSpec(new_wire, i));
cell->setPort(RTLIL::escape_id(portname_int), wire_bit);
if (!portname_pad.empty())
rewrite_bits[wire][i] = make_pair(cell, RTLIL::escape_id(portname_pad));
if (!widthparam.empty())
cell->parameters[RTLIL::escape_id(widthparam)] = RTLIL::Const(1);
if (!nameparam.empty())
@ -414,9 +333,15 @@ struct IopadmapPass : public Pass {
else
{
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(celltype));
cell->setPort(RTLIL::escape_id(portname), RTLIL::SigSpec(wire));
if (!portname2.empty())
cell->setPort(RTLIL::escape_id(portname2), RTLIL::SigSpec(new_wire));
cell->setPort(RTLIL::escape_id(portname_int), RTLIL::SigSpec(wire));
if (!portname_pad.empty()) {
RTLIL::Wire *new_wire = NULL;
new_wire = module->addWire(NEW_ID, wire);
module->swap_names(new_wire, wire);
wire->attributes.clear();
cell->setPort(RTLIL::escape_id(portname_pad), RTLIL::SigSpec(new_wire));
}
if (!widthparam.empty())
cell->parameters[RTLIL::escape_id(widthparam)] = RTLIL::Const(wire->width);
if (!nameparam.empty())
@ -424,6 +349,32 @@ struct IopadmapPass : public Pass {
cell->attributes[ID::keep] = RTLIL::Const(1);
}
if (!rewrite_bits.count(wire)) {
wire->port_id = 0;
wire->port_input = false;
wire->port_output = false;
}
}
for (auto &it : rewrite_bits) {
RTLIL::Wire *wire = it.first;
RTLIL::Wire *new_wire = module->addWire(NEW_ID, wire);
module->swap_names(new_wire, wire);
wire->attributes.clear();
for (int i = 0; i < wire->width; i++)
{
SigBit wire_bit(wire, i);
if (!it.second.count(i)) {
if (wire->port_output)
module->connect(SigSpec(new_wire, i), SigSpec(wire, i));
else
module->connect(SigSpec(wire, i), SigSpec(new_wire, i));
} else {
auto &new_conn = it.second.at(i);
new_conn.first->setPort(new_conn.second, RTLIL::SigSpec(new_wire, i));
}
}
wire->port_id = 0;
wire->port_input = false;
wire->port_output = false;

99
tests/techmap/iopadmap.ys Normal file
View file

@ -0,0 +1,99 @@
read_verilog << EOT
module ibuf ((* iopad_external_pin *) input i, output o); endmodule
module obuf (input i, (* iopad_external_pin *) output o); endmodule
module obuft (input i, input oe, (* iopad_external_pin *) output o); endmodule
module iobuf (input i, input oe, output o, (* iopad_external_pin *) inout io); endmodule
module a(input i, output o);
assign o = i;
endmodule
module b(input i, output o);
assign o = i;
ibuf b (.i(i), .o(o));
endmodule
module c(input i, output o);
obuf b (.i(i), .o(o));
endmodule
module d(input i, oe, output o, o2, o3);
assign o = oe ? i : 1'bz;
assign o2 = o;
assign o3 = ~o;
endmodule
module e(input i, oe, inout io, output o2, o3);
assign io = oe ? i : 1'bz;
assign o2 = io;
assign o3 = ~io;
endmodule
EOT
opt_clean
tribuf
simplemap
iopadmap -bits -inpad ibuf o:i -outpad obuf i:o -toutpad obuft oe:i:o -tinoutpad iobuf oe:o:i:io
opt_clean
select -assert-count 1 a/t:ibuf
select -assert-count 1 a/t:obuf
select -set ib w:i %a %co a/t:ibuf %i
select -set ob w:o %a %ci a/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @ob
select -assert-count 1 @ib %co %co @ob %i
select -assert-count 1 b/t:ibuf
select -assert-count 1 b/t:obuf
select -set ib w:i %a %co b/t:ibuf %i
select -set ob w:o %a %ci b/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @ob
select -assert-count 1 @ib %co %co @ob %i
select -assert-count 1 c/t:ibuf
select -assert-count 1 c/t:obuf
select -set ib w:i %a %co c/t:ibuf %i
select -set ob w:o %a %ci c/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @ob
select -assert-count 1 @ib %co %co @ob %i
select -assert-count 2 d/t:ibuf
select -assert-count 2 d/t:obuf
select -assert-count 1 d/t:obuft
select -set ib w:i %a %co d/t:ibuf %i
select -set oeb w:oe %a %co d/t:ibuf %i
select -set ob w:o %a %ci d/t:obuft %i
select -set o2b w:o2 %a %ci d/t:obuf %i
select -set o3b w:o3 %a %ci d/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @oeb
select -assert-count 1 @ob
select -assert-count 1 @o2b
select -assert-count 1 @o3b
select -assert-count 1 @ib %co %co @ob %i
select -assert-count 1 @oeb %co %co @ob %i
select -assert-count 1 @ib %co %co @o2b %i
select -assert-count 1 @ib %co %co t:$_NOT_ %i
select -assert-count 1 @o3b %ci %ci t:$_NOT_ %i
select -assert-count 2 e/t:ibuf
select -assert-count 2 e/t:obuf
select -assert-count 1 e/t:iobuf
select -set ib w:i %a %co e/t:ibuf %i
select -set oeb w:oe %a %co e/t:ibuf %i
select -set iob w:io %a %ci e/t:iobuf %i
select -set o2b w:o2 %a %ci e/t:obuf %i
select -set o3b w:o3 %a %ci e/t:obuf %i
select -assert-count 1 @ib
select -assert-count 1 @oeb
select -assert-count 1 @iob
select -assert-count 1 @o2b
select -assert-count 1 @o3b
select -assert-count 1 @ib %co %co @iob %i
select -assert-count 1 @oeb %co %co @iob %i
select -assert-count 1 @iob %co %co @o2b %i
select -assert-count 1 @iob %co %co t:$_NOT_ %i
select -assert-count 1 @o3b %ci %ci t:$_NOT_ %i