From 93508d58dafbbffcedffa70b21a197b6fca8bb30 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marcelina=20Ko=C5=9Bcielnicka?= <mwk@0x04.net>
Date: Mon, 24 Jan 2022 16:02:29 +0100
Subject: Add $bmux and $demux cells.
---
backends/btor/btor.cc | 5 ++
backends/cxxrtl/cxxrtl.h | 36 +++++++++++++
backends/cxxrtl/cxxrtl_backend.cc | 18 ++++++-
backends/firrtl/firrtl.cc | 6 ++-
backends/smt2/smt2.cc | 5 ++
backends/smv/smv.cc | 5 ++
backends/verilog/verilog_backend.cc | 4 ++
kernel/calc.cc | 51 ++++++++++++++++++
kernel/celledges.cc | 40 +++++++++++++++
kernel/celltypes.h | 29 +++++------
kernel/consteval.h | 35 ++++++++++++-
kernel/qcsat.cc | 2 +-
kernel/rtlil.cc | 47 ++++++++++++++++-
kernel/rtlil.h | 7 +++
kernel/satgen.cc | 100 ++++++++++++++++++++++++++++++++++++
passes/cmds/clean_zerowidth.cc | 2 +-
passes/cmds/stat.cc | 4 ++
passes/sat/sim.cc | 6 +++
passes/techmap/Makefile.inc | 2 +
passes/techmap/bmuxmap.cc | 76 +++++++++++++++++++++++++++
passes/techmap/demuxmap.cc | 80 +++++++++++++++++++++++++++++
passes/techmap/simplemap.cc | 26 +++++++++-
passes/tests/test_cell.cc | 46 ++++++++++++++++-
techlibs/common/simlib.v | 72 +++++++++++++++++---------
techlibs/common/techmap.v | 39 +++++++++++++-
25 files changed, 694 insertions(+), 49 deletions(-)
create mode 100644 passes/techmap/bmuxmap.cc
create mode 100644 passes/techmap/demuxmap.cc
diff --git a/backends/btor/btor.cc b/backends/btor/btor.cc
index 96df54a2c..d62cc4c3d 100644
--- a/backends/btor/btor.cc
+++ b/backends/btor/btor.cc
@@ -1399,6 +1399,11 @@ struct BtorBackend : public Backend {
log_header(design, "Executing BTOR backend.\n");
+ log_push();
+ Pass::call(design, "bmuxmap");
+ Pass::call(design, "demuxmap");
+ log_pop();
+
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
diff --git a/backends/cxxrtl/cxxrtl.h b/backends/cxxrtl/cxxrtl.h
index 3e1357498..b4ffa87cd 100644
--- a/backends/cxxrtl/cxxrtl.h
+++ b/backends/cxxrtl/cxxrtl.h
@@ -457,6 +457,42 @@ struct value : public expr_base<value<Bits>> {
return shr<AmountBits, /*Signed=*/true>(amount);
}
+ template<size_t ResultBits, size_t SelBits>
+ value<ResultBits> bmux(const value<SelBits> &sel) const {
+ static_assert(ResultBits << SelBits == Bits, "invalid sizes used in bmux()");
+ size_t amount = sel.data[0] * ResultBits;
+ size_t shift_chunks = amount / chunk::bits;
+ size_t shift_bits = amount % chunk::bits;
+ value<ResultBits> result;
+ chunk::type carry = 0;
+ if (ResultBits % chunk::bits + shift_bits > chunk::bits)
+ carry = data[result.chunks + shift_chunks] << (chunk::bits - shift_bits);
+ for (size_t n = 0; n < result.chunks; n++) {
+ result.data[result.chunks - 1 - n] = carry | (data[result.chunks + shift_chunks - 1 - n] >> shift_bits);
+ carry = (shift_bits == 0) ? 0
+ : data[result.chunks + shift_chunks - 1 - n] << (chunk::bits - shift_bits);
+ }
+ return result;
+ }
+
+ template<size_t ResultBits, size_t SelBits>
+ value<ResultBits> demux(const value<SelBits> &sel) const {
+ static_assert(Bits << SelBits == ResultBits, "invalid sizes used in demux()");
+ size_t amount = sel.data[0] * Bits;
+ size_t shift_chunks = amount / chunk::bits;
+ size_t shift_bits = amount % chunk::bits;
+ value<ResultBits> result;
+ chunk::type carry = 0;
+ for (size_t n = 0; n < chunks; n++) {
+ result.data[shift_chunks + n] = (data[n] << shift_bits) | carry;
+ carry = (shift_bits == 0) ? 0
+ : data[n] >> (chunk::bits - shift_bits);
+ }
+ if (Bits % chunk::bits + shift_bits > chunk::bits)
+ result.data[shift_chunks + chunks] = carry;
+ return result;
+ }
+
size_t ctpop() const {
size_t count = 0;
for (size_t n = 0; n < chunks; n++) {
diff --git a/backends/cxxrtl/cxxrtl_backend.cc b/backends/cxxrtl/cxxrtl_backend.cc
index 7a336f8c1..404755b1e 100644
--- a/backends/cxxrtl/cxxrtl_backend.cc
+++ b/backends/cxxrtl/cxxrtl_backend.cc
@@ -198,7 +198,7 @@ bool is_extending_cell(RTLIL::IdString type)
bool is_inlinable_cell(RTLIL::IdString type)
{
return is_unary_cell(type) || is_binary_cell(type) || type.in(
- ID($mux), ID($concat), ID($slice), ID($pmux));
+ ID($mux), ID($concat), ID($slice), ID($pmux), ID($bmux), ID($demux));
}
bool is_ff_cell(RTLIL::IdString type)
@@ -1154,6 +1154,22 @@ struct CxxrtlWorker {
for (int part = 0; part < s_width; part++) {
f << ")";
}
+ // Big muxes
+ } else if (cell->type == ID($bmux)) {
+ dump_sigspec_rhs(cell->getPort(ID::A), for_debug);
+ f << ".bmux<";
+ f << cell->getParam(ID::WIDTH).as_int();
+ f << ">(";
+ dump_sigspec_rhs(cell->getPort(ID::S), for_debug);
+ f << ").val()";
+ // Demuxes
+ } else if (cell->type == ID($demux)) {
+ dump_sigspec_rhs(cell->getPort(ID::A), for_debug);
+ f << ".demux<";
+ f << GetSize(cell->getPort(ID::Y));
+ f << ">(";
+ dump_sigspec_rhs(cell->getPort(ID::S), for_debug);
+ f << ").val()";
// Concats
} else if (cell->type == ID($concat)) {
dump_sigspec_rhs(cell->getPort(ID::B), for_debug);
diff --git a/backends/firrtl/firrtl.cc b/backends/firrtl/firrtl.cc
index 7abe584c9..85c44824f 100644
--- a/backends/firrtl/firrtl.cc
+++ b/backends/firrtl/firrtl.cc
@@ -1188,6 +1188,8 @@ struct FirrtlBackend : public Backend {
log("Write a FIRRTL netlist of the current design.\n");
log("The following commands are executed by this command:\n");
log(" pmuxtree\n");
+ log(" bmuxmap\n");
+ log(" demuxmap\n");
log("\n");
}
void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) override
@@ -1210,7 +1212,9 @@ struct FirrtlBackend : public Backend {
log_header(design, "Executing FIRRTL backend.\n");
log_push();
- Pass::call(design, stringf("pmuxtree"));
+ Pass::call(design, "pmuxtree");
+ Pass::call(design, "bmuxmap");
+ Pass::call(design, "demuxmap");
namecache.clear();
autoid_counter = 0;
diff --git a/backends/smt2/smt2.cc b/backends/smt2/smt2.cc
index f2fa003bc..a928419a1 100644
--- a/backends/smt2/smt2.cc
+++ b/backends/smt2/smt2.cc
@@ -1531,6 +1531,11 @@ struct Smt2Backend : public Backend {
log_header(design, "Executing SMT2 backend.\n");
+ log_push();
+ Pass::call(design, "bmuxmap");
+ Pass::call(design, "demuxmap");
+ log_pop();
+
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
diff --git a/backends/smv/smv.cc b/backends/smv/smv.cc
index 7bace6912..7d4f94adc 100644
--- a/backends/smv/smv.cc
+++ b/backends/smv/smv.cc
@@ -741,6 +741,11 @@ struct SmvBackend : public Backend {
log_header(design, "Executing SMV backend.\n");
+ log_push();
+ Pass::call(design, "bmuxmap");
+ Pass::call(design, "demuxmap");
+ log_pop();
+
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
diff --git a/backends/verilog/verilog_backend.cc b/backends/verilog/verilog_backend.cc
index e4781ef3e..32003cf54 100644
--- a/backends/verilog/verilog_backend.cc
+++ b/backends/verilog/verilog_backend.cc
@@ -2300,7 +2300,11 @@ struct VerilogBackend : public Backend {
extmem_prefix = filename.substr(0, filename.rfind('.'));
}
+ log_push();
+ Pass::call(design, "bmuxmap");
+ Pass::call(design, "demuxmap");
Pass::call(design, "clean_zerowidth");
+ log_pop();
design->sort();
diff --git a/kernel/calc.cc b/kernel/calc.cc
index 1e6410f7d..0865db526 100644
--- a/kernel/calc.cc
+++ b/kernel/calc.cc
@@ -609,5 +609,56 @@ RTLIL::Const RTLIL::const_neg(const RTLIL::Const &arg1, const RTLIL::Const&, boo
return RTLIL::const_sub(zero, arg1_ext, true, signed1, result_len);
}
+RTLIL::Const RTLIL::const_bmux(const RTLIL::Const &arg1, const RTLIL::Const &arg2)
+{
+ std::vector<RTLIL::State> t = arg1.bits;
+
+ for (int i = GetSize(arg2)-1; i >= 0; i--)
+ {
+ RTLIL::State sel = arg2.bits.at(i);
+ std::vector<RTLIL::State> new_t;
+ if (sel == State::S0)
+ new_t = std::vector<RTLIL::State>(t.begin(), t.begin() + GetSize(t)/2);
+ else if (sel == State::S1)
+ new_t = std::vector<RTLIL::State>(t.begin() + GetSize(t)/2, t.end());
+ else
+ for (int j = 0; j < GetSize(t)/2; j++)
+ new_t.push_back(t[j] == t[j + GetSize(t)/2] ? t[j] : RTLIL::Sx);
+ t.swap(new_t);
+ }
+
+ return t;
+}
+
+RTLIL::Const RTLIL::const_demux(const RTLIL::Const &arg1, const RTLIL::Const &arg2)
+{
+ int width = GetSize(arg1);
+ int s_width = GetSize(arg2);
+ std::vector<RTLIL::State> res;
+ for (int i = 0; i < (1 << s_width); i++)
+ {
+ bool ne = false;
+ bool x = false;
+ for (int j = 0; j < s_width; j++) {
+ bool bit = i & 1 << j;
+ if (arg2[j] == (bit ? RTLIL::S0 : RTLIL::S1))
+ ne = true;
+ else if (arg2[j] != RTLIL::S0 && arg2[j] != RTLIL::S1)
+ x = true;
+ }
+ if (ne) {
+ for (int j = 0; j < width; j++)
+ res.push_back(State::S0);
+ } else if (x) {
+ for (int j = 0; j < width; j++)
+ res.push_back(arg1.bits[j] == State::S0 ? State::S0 : State::Sx);
+ } else {
+ for (int j = 0; j < width; j++)
+ res.push_back(arg1.bits[j]);
+ }
+ }
+ return res;
+}
+
YOSYS_NAMESPACE_END
diff --git a/kernel/celledges.cc b/kernel/celledges.cc
index af07d26b3..c43ba8db3 100644
--- a/kernel/celledges.cc
+++ b/kernel/celledges.cc
@@ -142,6 +142,36 @@ void mux_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
}
}
+void bmux_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
+{
+ int width = GetSize(cell->getPort(ID::Y));
+ int a_width = GetSize(cell->getPort(ID::A));
+ int s_width = GetSize(cell->getPort(ID::S));
+
+ for (int i = 0; i < width; i++)
+ {
+ for (int k = i; k < a_width; k += width)
+ db->add_edge(cell, ID::A, k, ID::Y, i, -1);
+
+ for (int k = 0; k < s_width; k++)
+ db->add_edge(cell, ID::S, k, ID::Y, i, -1);
+ }
+}
+
+void demux_op(AbstractCellEdgesDatabase *db, RTLIL::Cell *cell)
+{
+ int width = GetSize(cell->getPort(ID::Y));
+ int a_width = GetSize(cell->getPort(ID::A));
+ int s_width = GetSize(cell->getPort(ID::S));
+
+ for (int i = 0; i < width; i++)
+ {
+ db->add_edge(cell, ID::A, i % a_width, ID::Y, i, -1);
+ for (int k = 0; k < s_width; k++)
+ db->add_edge(cell, ID::S, k, ID::Y, i, -1);
+ }
+}
+
PRIVATE_NAMESPACE_END
bool YOSYS_NAMESPACE_PREFIX AbstractCellEdgesDatabase::add_edges_from_cell(RTLIL::Cell *cell)
@@ -187,6 +217,16 @@ bool YOSYS_NAMESPACE_PREFIX AbstractCellEdgesDatabase::add_edges_from_cell(RTLIL
return true;
}
+ if (cell->type == ID($bmux)) {
+ bmux_op(this, cell);
+ return true;
+ }
+
+ if (cell->type == ID($demux)) {
+ demux_op(this, cell);
+ return true;
+ }
+
// FIXME: $mul $div $mod $divfloor $modfloor $slice $concat
// FIXME: $lut $sop $alu $lcu $macc $fa
diff --git a/kernel/celltypes.h b/kernel/celltypes.h
index 879ac0edc..7e9cfb38d 100644
--- a/kernel/celltypes.h
+++ b/kernel/celltypes.h
@@ -127,6 +127,9 @@ struct CellTypes
for (auto type : std::vector<RTLIL::IdString>({ID($mux), ID($pmux)}))
setup_type(type, {ID::A, ID::B, ID::S}, {ID::Y}, true);
+ for (auto type : std::vector<RTLIL::IdString>({ID($bmux), ID($demux)}))
+ setup_type(type, {ID::A, ID::S}, {ID::Y}, true);
+
setup_type(ID($lcu), {ID::P, ID::G, ID::CI}, {ID::CO}, true);
setup_type(ID($alu), {ID::A, ID::B, ID::CI, ID::BI}, {ID::X, ID::Y, ID::CO}, true);
setup_type(ID($fa), {ID::A, ID::B, ID::C}, {ID::X, ID::Y}, true);
@@ -411,6 +414,16 @@ struct CellTypes
return ret;
}
+ if (cell->type == ID($bmux))
+ {
+ return const_bmux(arg1, arg2);
+ }
+
+ if (cell->type == ID($demux))
+ {
+ return const_demux(arg1, arg2);
+ }
+
if (cell->type == ID($lut))
{
int width = cell->parameters.at(ID::WIDTH).as_int();
@@ -420,21 +433,7 @@ struct CellTypes
t.push_back(State::S0);
t.resize(1 << width);
- for (int i = width-1; i >= 0; i--) {
- RTLIL::State sel = arg1.bits.at(i);
- std::vector<RTLIL::State> new_t;
- if (sel == State::S0)
- new_t = std::vector<RTLIL::State>(t.begin(), t.begin() + GetSize(t)/2);
- else if (sel == State::S1)
- new_t = std::vector<RTLIL::State>(t.begin() + GetSize(t)/2, t.end());
- else
- for (int j = 0; j < GetSize(t)/2; j++)
- new_t.push_back(t[j] == t[j + GetSize(t)/2] ? t[j] : RTLIL::Sx);
- t.swap(new_t);
- }
-
- log_assert(GetSize(t) == 1);
- return t;
+ return const_bmux(t, arg1);
}
if (cell->type == ID($sop))
diff --git a/kernel/consteval.h b/kernel/consteval.h
index 3edfc490c..642eb42b2 100644
--- a/kernel/consteval.h
+++ b/kernel/consteval.h
@@ -135,8 +135,6 @@ struct ConstEval
if (cell->hasPort(ID::S)) {
sig_s = cell->getPort(ID::S);
- if (!eval(sig_s, undef, cell))
- return false;
}
if (cell->hasPort(ID::A))
@@ -151,6 +149,9 @@ struct ConstEval
int count_maybe_set_s_bits = 0;
int count_set_s_bits = 0;
+ if (!eval(sig_s, undef, cell))
+ return false;
+
for (int i = 0; i < sig_s.size(); i++)
{
RTLIL::State s_bit = sig_s.extract(i, 1).as_const().bits.at(0);
@@ -198,6 +199,36 @@ struct ConstEval
else
set(sig_y, y_values.front());
}
+ else if (cell->type == ID($bmux))
+ {
+ if (!eval(sig_s, undef, cell))
+ return false;
+
+ if (sig_s.is_fully_def()) {
+ int sel = sig_s.as_int();
+ int width = GetSize(sig_y);
+ SigSpec res = sig_a.extract(sel * width, width);
+ if (!eval(res, undef, cell))
+ return false;
+ set(sig_y, res.as_const());
+ } else {
+ if (!eval(sig_a, undef, cell))
+ return false;
+ set(sig_y, const_bmux(sig_a.as_const(), sig_s.as_const()));
+ }
+ }
+ else if (cell->type == ID($demux))
+ {
+ if (!eval(sig_a, undef, cell))
+ return false;
+ if (sig_a.is_fully_zero()) {
+ set(sig_y, Const(0, GetSize(sig_y)));
+ } else {
+ if (!eval(sig_s, undef, cell))
+ return false;
+ set(sig_y, const_demux(sig_a.as_const(), sig_s.as_const()));
+ }
+ }
else if (cell->type == ID($fa))
{
RTLIL::SigSpec sig_c = cell->getPort(ID::C);
diff --git a/kernel/qcsat.cc b/kernel/qcsat.cc
index b7da958db..aaee984fb 100644
--- a/kernel/qcsat.cc
+++ b/kernel/qcsat.cc
@@ -84,7 +84,7 @@ int QuickConeSat::cell_complexity(RTLIL::Cell *cell)
ID($reduce_xnor), ID($reduce_bool),
ID($logic_not), ID($logic_and), ID($logic_or),
ID($eq), ID($ne), ID($eqx), ID($nex), ID($fa),
- ID($mux), ID($pmux), ID($lut), ID($sop),
+ ID($mux), ID($pmux), ID($bmux), ID($demux), ID($lut), ID($sop),
ID($_NOT_), ID($_AND_), ID($_NAND_), ID($_OR_), ID($_NOR_),
ID($_XOR_), ID($_XNOR_), ID($_ANDNOT_), ID($_ORNOT_),
ID($_MUX_), ID($_NMUX_), ID($_MUX4_), ID($_MUX8_), ID($_MUX16_),
diff --git a/kernel/rtlil.cc b/kernel/rtlil.cc
index cd0f5ab12..a89edd992 100644
--- a/kernel/rtlil.cc
+++ b/kernel/rtlil.cc
@@ -1251,6 +1251,22 @@ namespace {
return;
}
+ if (cell->type == ID($bmux)) {
+ port(ID::A, param(ID::WIDTH) << param(ID::S_WIDTH));
+ port(ID::S, param(ID::S_WIDTH));
+ port(ID::Y, param(ID::WIDTH));
+ check_expected();
+ return;
+ }
+
+ if (cell->type == ID($demux)) {
+ port(ID::A, param(ID::WIDTH));
+ port(ID::S, param(ID::S_WIDTH));
+ port(ID::Y, param(ID::WIDTH) << param(ID::S_WIDTH));
+ check_expected();
+ return;
+ }
+
if (cell->type == ID($lut)) {
param(ID::LUT);
port(ID::A, param(ID::WIDTH));
@@ -2444,6 +2460,26 @@ DEF_METHOD(Mux, ID($mux), 0)
DEF_METHOD(Pmux, ID($pmux), 1)
#undef DEF_METHOD
+#define DEF_METHOD(_func, _type, _demux) \
+ RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_s, const RTLIL::SigSpec &sig_y, const std::string &src) { \
+ RTLIL::Cell *cell = addCell(name, _type); \
+ cell->parameters[ID::WIDTH] = _demux ? sig_a.size() : sig_y.size(); \
+ cell->parameters[ID::S_WIDTH] = sig_s.size(); \
+ cell->setPort(ID::A, sig_a); \
+ cell->setPort(ID::S, sig_s); \
+ cell->setPort(ID::Y, sig_y); \
+ cell->set_src_attribute(src); \
+ return cell; \
+ } \
+ RTLIL::SigSpec RTLIL::Module::_func(RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_s, const std::string &src) { \
+ RTLIL::SigSpec sig_y = addWire(NEW_ID, _demux ? sig_a.size() << sig_s.size() : sig_a.size() >> sig_s.size()); \
+ add ## _func(name, sig_a, sig_s, sig_y, src); \
+ return sig_y; \
+ }
+DEF_METHOD(Bmux, ID($bmux), 0)
+DEF_METHOD(Demux, ID($demux), 1)
+#undef DEF_METHOD
+
#define DEF_METHOD_2(_func, _type, _P1, _P2) \
RTLIL::Cell* RTLIL::Module::add ## _func(RTLIL::IdString name, const RTLIL::SigBit &sig1, const RTLIL::SigBit &sig2, const std::string &src) { \
RTLIL::Cell *cell = addCell(name, _type); \
@@ -3358,14 +3394,21 @@ void RTLIL::Cell::fixup_parameters(bool set_a_signed, bool set_b_signed)
type.begins_with("$verific$") || type.begins_with("$array:") || type.begins_with("$extern:"))
return;
- if (type == ID($mux) || type == ID($pmux)) {
+ if (type == ID($mux) || type == ID($pmux) || type == ID($bmux)) {
parameters[ID::WIDTH] = GetSize(connections_[ID::Y]);
- if (type == ID($pmux))
+ if (type != ID($mux))
parameters[ID::S_WIDTH] = GetSize(connections_[ID::S]);
check();
return;
}
+ if (type == ID($demux)) {
+ parameters[ID::WIDTH] = GetSize(connections_[ID::A]);
+ parameters[ID::S_WIDTH] = GetSize(connections_[ID::S]);
+ check();
+ return;
+ }
+
if (type == ID($lut) || type == ID($sop)) {
parameters[ID::WIDTH] = GetSize(connections_[ID::A]);
return;
diff --git a/kernel/rtlil.h b/kernel/rtlil.h
index a562d253c..d8300f159 100644
--- a/kernel/rtlil.h
+++ b/kernel/rtlil.h
@@ -485,6 +485,9 @@ namespace RTLIL
RTLIL::Const const_pos (const RTLIL::Const &arg1, const RTLIL::Const &arg2, bool signed1, bool signed2, int result_len);
RTLIL::Const const_neg (const RTLIL::Const &arg1, const RTLIL::Const &arg2, bool signed1, bool signed2, int result_len);
+ RTLIL::Const const_bmux (const RTLIL::Const &arg1, const RTLIL::Const &arg2);
+ RTLIL::Const const_demux (const RTLIL::Const &arg1, const RTLIL::Const &arg2);
+
// This iterator-range-pair is used for Design::modules(), Module::wires() and Module::cells().
// It maintains a reference counter that is used to make sure that the container is not modified while being iterated over.
@@ -1296,6 +1299,8 @@ public:
RTLIL::Cell* addMux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_b, const RTLIL::SigSpec &sig_s, const RTLIL::SigSpec &sig_y, const std::string &src = "");
RTLIL::Cell* addPmux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_b, const RTLIL::SigSpec &sig_s, const RTLIL::SigSpec &sig_y, const std::string &src = "");
+ RTLIL::Cell* addBmux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_s, const RTLIL::SigSpec &sig_y, const std::string &src = "");
+ RTLIL::Cell* addDemux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_s, const RTLIL::SigSpec &sig_y, const std::string &src = "");
RTLIL::Cell* addSlice (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_y, RTLIL::Const offset, const std::string &src = "");
RTLIL::Cell* addConcat (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_b, const RTLIL::SigSpec &sig_y, const std::string &src = "");
@@ -1421,6 +1426,8 @@ public:
RTLIL::SigSpec Mux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_b, const RTLIL::SigSpec &sig_s, const std::string &src = "");
RTLIL::SigSpec Pmux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_b, const RTLIL::SigSpec &sig_s, const std::string &src = "");
+ RTLIL::SigSpec Bmux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_s, const std::string &src = "");
+ RTLIL::SigSpec Demux (RTLIL::IdString name, const RTLIL::SigSpec &sig_a, const RTLIL::SigSpec &sig_s, const std::string &src = "");
RTLIL::SigBit BufGate (RTLIL::IdString name, const RTLIL::SigBit &sig_a, const std::string &src = "");
RTLIL::SigBit NotGate (RTLIL::IdString name, const RTLIL::SigBit &sig_a, const std::string &src = "");
diff --git a/kernel/satgen.cc b/kernel/satgen.cc
index 214826f5a..9c40ec66d 100644
--- a/kernel/satgen.cc
+++ b/kernel/satgen.cc
@@ -252,6 +252,106 @@ bool SatGen::importCell(RTLIL::Cell *cell, int timestep)
return true;
}
+ if (cell->type == ID($bmux))
+ {
+ std::vector<int> a = importDefSigSpec(cell->getPort(ID::A), timestep);
+ std::vector<int> s = importDefSigSpec(cell->getPort(ID::S), timestep);
+ std::vector<int> y = importDefSigSpec(cell->getPort(ID::Y), timestep);
+ std::vector<int> undef_a, undef_s, undef_y;
+
+ if (model_undef)
+ {
+ undef_a = importUndefSigSpec(cell->getPort(ID::A), timestep);
+ undef_s = importUndefSigSpec(cell->getPort(ID::S), timestep);
+ undef_y = importUndefSigSpec(cell->getPort(ID::Y), timestep);
+ }
+
+ if (GetSize(s) == 0) {
+ ez->vec_set(a, y);
+ if (model_undef)
+ ez->vec_set(undef_a, undef_y);
+ } else {
+ for (int i = GetSize(s)-1; i >= 0; i--)
+ {
+ std::vector<int> out = (i == 0) ? y : ez->vec_var(a.size() / 2);
+ std::vector<int> yy = model_undef ? ez->vec_var(out.size()) : out;
+
+ std::vector<int> a0(a.begin(), a.begin() + a.size() / 2);
+ std::vector<int> a1(a.begin() + a.size() / 2, a.end());
+ ez->assume(ez->vec_eq(ez->vec_ite(s.at(i), a1, a0), yy));
+
+ if (model_undef)
+ {
+ std::vector<int> undef_out = (i == 0) ? undef_y : ez->vec_var(a.size() / 2);
+ std::vector<int> undef_a0(undef_a.begin(), undef_a.begin() + a.size() / 2);
+ std::vector<int> undef_a1(undef_a.begin() + a.size() / 2, undef_a.end());
+ std::vector<int> unequal_ab = ez->vec_not(ez->vec_iff(a0, a1));
+ std::vector<int> undef_ab = ez->vec_or(unequal_ab, ez->vec_or(undef_a0, undef_a1));
+ std::vector<int> yX = ez->vec_ite(undef_s.at(i), undef_ab, ez->vec_ite(s.at(i), undef_a1, undef_a0));
+ ez->assume(ez->vec_eq(yX, undef_out));
+ undefGating(out, yy, undef_out);
+
+ undef_a = undef_out;
+ }
+
+ a = out;
+ }
+ }
+ return true;
+ }
+
+ if (cell->type == ID($demux))
+ {
+ std::vector<int> a = importDefSigSpec(cell->getPort(ID::A), timestep);
+ std::vector<int> s = importDefSigSpec(cell->getPort(ID::S), timestep);
+ std::vector<int> y = importDefSigSpec(cell->getPort(ID::Y), timestep);
+ std::vector<int> yy = model_undef ? ez->vec_var(y.size()) : y;
+ std::vector<int> undef_a, undef_s, undef_y;
+
+ if (model_undef)
+ {
+ undef_a = importUndefSigSpec(cell->getPort(ID::A), timestep);
+ undef_s = importUndefSigSpec(cell->getPort(ID::S), timestep);
+ undef_y = importUndefSigSpec(cell->getPort(ID::Y), timestep);
+ }
+
+ if (GetSize(s) == 0) {
+ ez->vec_set(a, y);
+ if (model_undef)
+ ez->vec_set(undef_a, undef_y);
+ } else {
+ for (int i = 0; i < (1 << GetSize(s)); i++)
+ {
+ std::vector<int> ss;
+ for (int j = 0; j < GetSize(s); j++) {
+ if (i & 1 << j)
+ ss.push_back(s[j]);
+ else
+ ss.push_back(ez->NOT(s[j]));
+ }
+ int sss = ez->expression(ezSAT::OpAnd, ss);
+
+ for (int j = 0; j < GetSize(a); j++) {
+ ez->SET(ez->AND(sss, a[j]), yy.at(i * GetSize(a) + j));
+ }
+
+ if (model_undef)
+ {
+ int s0 = ez->expression(ezSAT::OpOr, ez->vec_and(ez->vec_not(ss), ez->vec_not(undef_s)));
+ int us = ez->AND(ez->NOT(s0), ez->expression(ezSAT::OpOr, undef_s));
+ for (int j = 0; j < GetSize(a); j++) {
+ int a0 = ez->AND(ez->NOT(a[j]), ez->NOT(undef_a[j]));
+ int yX = ez->AND(ez->OR(us, undef_a[j]), ez->NOT(ez->OR(s0, a0)));
+ ez->SET(yX, undef_y.at(i * GetSize(a) + j));
+ }
+ }
+ }
+ if (model_undef)
+ undefGating(y, yy, undef_y);
+ }
+ return true;
+ }
+
if (cell->type == ID($pmux))
{
std::vector<int> a = importDefSigSpec(cell->getPort(ID::A), timestep);
diff --git a/passes/cmds/clean_zerowidth.cc b/passes/cmds/clean_zerowidth.cc
index 4e7c68093..bac6b1521 100644
--- a/passes/cmds/clean_zerowidth.cc
+++ b/passes/cmds/clean_zerowidth.cc
@@ -80,7 +80,7 @@ struct CleanZeroWidthPass : public Pass {
if (GetSize(cell->getPort(ID::Q)) == 0) {
module->remove(cell);
}
- } else if (cell->type == ID($pmux)) {
+ } else if (cell->type.in(ID($pmux), ID($bmux), ID($demux))) {
// Remove altogether if WIDTH is 0, replace with
// a connection if S_WIDTH is 0.
if (cell->getParam(ID::WIDTH).as_int() == 0) {
diff --git a/passes/cmds/stat.cc b/passes/cmds/stat.cc
index 14a27ed99..fffdda48e 100644
--- a/passes/cmds/stat.cc
+++ b/passes/cmds/stat.cc
@@ -117,6 +117,10 @@ struct statdata_t
}
else if (cell_type.in(ID($mux), ID($pmux)))
cell_type = stringf("%s_%d", cell_type.c_str(), GetSize(cell->getPort(ID::Y)));
+ else if (cell_type == ID($bmux))
+ cell_type = stringf("%s_%d_%d", cell_type.c_str(), GetSize(cell->getPort(ID::Y)), GetSize(cell->getPort(ID::S)));
+ else if (cell_type == ID($demux))
+ cell_type = stringf("%s_%d_%d", cell_type.c_str(), GetSize(cell->getPort(ID::A)), GetSize(cell->getPort(ID::S)));
else if (cell_type.in(
ID($sr), ID($ff), ID($dff), ID($dffe), ID($dffsr), ID($dffsre),
ID($adff), ID($adffe), ID($sdff), ID($sdffe), ID($sdffce),
diff --git a/passes/sat/sim.cc b/passes/sat/sim.cc
index 4e158da62..8a44830d2 100644
--- a/passes/sat/sim.cc
+++ b/passes/sat/sim.cc
@@ -313,6 +313,12 @@ struct SimInstance
return;
}
+ // (A,S -> Y) cells
+ if (has_a && !has_b && !has_c && !has_d && has_s && has_y) {
+ set_state(sig_y, CellTypes::eval(cell, get_state(sig_a), get_state(sig_s)));
+ return;
+ }
+
// (A,B,S -> Y) cells
if (has_a && has_b && !has_c && !has_d && has_s && has_y) {
set_state(sig_y, CellTypes::eval(cell, get_state(sig_a), get_state(sig_b), get_state(sig_s)));
diff --git a/passes/techmap/Makefile.inc b/passes/techmap/Makefile.inc
index 035699603..98ccfc303 100644
--- a/passes/techmap/Makefile.inc
+++ b/passes/techmap/Makefile.inc
@@ -29,6 +29,8 @@ OBJS += passes/techmap/extract_reduce.o
OBJS += passes/techmap/alumacc.o
OBJS += passes/techmap/dffinit.o
OBJS += passes/techmap/pmuxtree.o
+OBJS += passes/techmap/bmuxmap.o
+OBJS += passes/techmap/demuxmap.o
OBJS += passes/techmap/muxcover.o
OBJS += passes/techmap/aigmap.o
OBJS += passes/techmap/tribuf.o
diff --git a/passes/techmap/bmuxmap.cc b/passes/techmap/bmuxmap.cc
new file mode 100644
index 000000000..03673c278
--- /dev/null
+++ b/passes/techmap/bmuxmap.cc
@@ -0,0 +1,76 @@
+/*
+ * yosys -- Yosys Open SYnthesis Suite
+ *
+ * Copyright (C) 2022 Marcelina Kościelnicka <mwk@0x04.net>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct BmuxmapPass : public Pass {
+ BmuxmapPass() : Pass("bmuxmap", "transform $bmux cells to trees of $mux cells") { }
+ void help() override
+ {
+ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+ log("\n");
+ log(" bmuxmap [selection]\n");
+ log("\n");
+ log("This pass transforms $bmux cells to trees of $mux cells.\n");
+ log("\n");
+ }
+ void execute(std::vector<std::string> args, RTLIL::Design *design) override
+ {
+ log_header(design, "Executing BMUXMAP pass.\n");
+
+ size_t argidx;
+ for (argidx = 1; argidx < args.size(); argidx++) {
+ break;
+ }
+ extra_args(args, argidx, design);
+
+ for (auto module : design->selected_modules())
+ for (auto cell : module->selected_cells())
+ {
+ if (cell->type != ID($bmux))
+ continue;
+
+ SigSpec sel = cell->getPort(ID::S);
+ SigSpec data = cell->getPort(ID::A);
+ int width = GetSize(cell->getPort(ID::Y));
+
+ for (int idx = 0; idx < GetSize(sel); idx++) {
+ SigSpec new_data = module->addWire(NEW_ID, GetSize(data)/2);
+ for (int i = 0; i < GetSize(new_data); i += width) {
+ RTLIL::Cell *mux = module->addMux(NEW_ID,
+ data.extract(i*2, width),
+ data.extract(i*2+width, width),
+ sel[idx],
+ new_data.extract(i, width));
+ mux->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
+ }
+ data = new_data;
+ }
+
+ module->connect(cell->getPort(ID::Y), data);
+ module->remove(cell);
+ }
+ }
+} BmuxmapPass;
+
+PRIVATE_NAMESPACE_END
diff --git a/passes/techmap/demuxmap.cc b/passes/techmap/demuxmap.cc
new file mode 100644
index 000000000..292b18bad
--- /dev/null
+++ b/passes/techmap/demuxmap.cc
@@ -0,0 +1,80 @@
+/*
+ * yosys -- Yosys Open SYnthesis Suite
+ *
+ * Copyright (C) 2022 Marcelina Kościelnicka <mwk@0x04.net>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct DemuxmapPass : public Pass {
+ DemuxmapPass() : Pass("demuxmap", "transform $demux cells to $eq + $mux cells") { }
+ void help() override
+ {
+ // |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+ log("\n");
+ log(" demuxmap [selection]\n");
+ log("\n");
+ log("This pass transforms $demux cells to a bunch of equality comparisons.\n");
+ log("\n");
+ }
+ void execute(std::vector<std::string> args, RTLIL::Design *design) override
+ {
+ log_header(design, "Executing DEMUXMAP pass.\n");
+
+ size_t argidx;
+ for (argidx = 1; argidx < args.size(); argidx++) {
+ break;
+ }
+ extra_args(args, argidx, design);
+
+ for (auto module : design->selected_modules())
+ for (auto cell : module->selected_cells())
+ {
+ if (cell->type != ID($demux))
+ continue;
+
+ SigSpec sel = cell->getPort(ID::S);
+ SigSpec data = cell->getPort(ID::A);
+ SigSpec out = cell->getPort(ID::Y);
+ int width = GetSize(cell->getPort(ID::A));
+
+ for (int i = 0; i < 1 << GetSize(sel); i++) {
+ if (width == 1 && data == State::S1) {
+ RTLIL::Cell *eq_cell = module->addEq(NEW_ID, sel, Const(i, GetSize(sel)), out[i]);
+ eq_cell->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
+ } else {
+ Wire *eq = module->addWire(NEW_ID);
+ RTLIL::Cell *eq_cell = module->addEq(NEW_ID, sel, Const(i, GetSize(sel)), eq);
+ eq_cell->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
+ RTLIL::Cell *mux = module->addMux(NEW_ID,
+ Const(State::S0, width),
+ data,
+ eq,
+ out.extract(i*width, width));
+ mux->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
+ }
+ }
+
+ module->remove(cell);
+ }
+ }
+} DemuxmapPass;
+
+PRIVATE_NAMESPACE_END
diff --git a/passes/techmap/simplemap.cc b/passes/techmap/simplemap.cc
index 68f44cf6d..7d8dba439 100644
--- a/passes/techmap/simplemap.cc
+++ b/passes/techmap/simplemap.cc
@@ -299,6 +299,30 @@ void simplemap_tribuf(RTLIL::Module *module, RTLIL::Cell *cell)
}
}
+void simplemap_bmux(RTLIL::Module *module, RTLIL::Cell *cell)
+{
+ SigSpec sel = cell->getPort(ID::S);
+ SigSpec data = cell->getPort(ID::A);
+ int width = GetSize(cell->getPort(ID::Y));
+
+ for (int idx = 0; idx < GetSize(sel); idx++) {
+ SigSpec new_data = module->addWire(NEW_ID, GetSize(data)/2);
+ for (int i = 0; i < GetSize(new_data); i += width) {
+ for (int k = 0; k < width; k++) {
+ RTLIL::Cell *gate = module->addCell(NEW_ID, ID($_MUX_));
+ gate->add_strpool_attribute(ID::src, cell->get_strpool_attribute(ID::src));
+ gate->setPort(ID::A, data[i*2+k]);
+ gate->setPort(ID::B, data[i*2+width+k]);
+ gate->setPort(ID::S, sel[idx]);
+ gate->setPort(ID::Y, new_data[i+k]);
+ }
+ }
+ data = new_data;
+ }
+
+ module->connect(cell->getPort(ID::Y), data);
+}
+
void simplemap_lut(RTLIL::Module *module, RTLIL::Cell *cell)
{
SigSpec lut_ctrl = cell->getPort(ID::A);
@@ -306,7 +330,6 @@ void simplemap_lut(RTLIL::Module *module, RTLIL::Cell *cell)
lut_data.extend_u0(1 << cell->getParam(ID::WIDTH).as_int());
for (int idx = 0; GetSize(lut_data) > 1; idx++) {
- SigSpec sig_s = lut_ctrl[idx];
SigSpec new_lut_data = module->addWire(NEW_ID, GetSize(lut_data)/2);
for (int i = 0; i < GetSize(lut_data); i += 2) {
RTLIL::Cell *gate = module->addCell(NEW_ID, ID($_MUX_));
@@ -400,6 +423,7 @@ void simplemap_get_mappers(dict<IdString, void(*)(RTLIL::Module*, RTLIL::Cell*)>
mappers[ID($nex)] = simplemap_eqne;
mappers[ID($mux)] = simplemap_mux;
mappers[ID($tribuf)] = simplemap_tribuf;
+ mappers[ID($bmux)] = simplemap_bmux;
mappers[ID($lut)] = simplemap_lut;
mappers[ID($sop)] = simplemap_sop;
mappers[ID($slice)] = simplemap_slice;
diff --git a/passes/tests/test_cell.cc b/passes/tests/test_cell.cc
index 4e437e409..e21ec452c 100644
--- a/passes/tests/test_cell.cc
+++ b/passes/tests/test_cell.cc
@@ -69,6 +69,48 @@ static void create_gold_module(RTLIL::Design *design, RTLIL::IdString cell_type,
cell->setPort(ID::Y, wire);
}
+ if (cell_type == ID($bmux))
+ {
+ int width = 1 + xorshift32(8);
+ int swidth = 1 + xorshift32(4);
+
+ wire = module->addWire(ID::A);
+ wire->width = width << swidth;
+ wire->port_input = true;
+ cell->setPort(ID::A, wire);
+
+ wire = module->addWire(ID::S);
+ wire->width = swidth;
+ wire->port_input = true;
+ cell->setPort(ID::S, wire);
+
+ wire = module->addWire(ID::Y);
+ wire->width = width;
+ wire->port_output = true;
+ cell->setPort(ID::Y, wire);
+ }
+
+ if (cell_type == ID($demux))
+ {
+ int width = 1 + xorshift32(8);
+ int swidth = 1 + xorshift32(6);
+
+ wire = module->addWire(ID::A);
+ wire->width = width;
+ wire->port_input = true;
+ cell->setPort(ID::A, wire);
+
+ wire = module->addWire(ID::S);
+ wire->width = swidth;
+ wire->port_input = true;
+ cell->setPort(ID::S, wire);
+
+ wire = module->addWire(ID::Y);
+ wire->width = width << swidth;
+ wire->port_output = true;
+ cell->setPort(ID::Y, wire);
+ }
+
if (cell_type == ID($fa))
{
int width = 1 + xorshift32(8);
@@ -855,8 +897,10 @@ struct TestCellPass : public Pass {
cell_types[ID($logic_and)] = "ABSY";
cell_types[ID($logic_or)] = "ABSY";
+ cell_types[ID($mux)] = "*";
+ cell_types[ID($bmux)] = "*";
+ cell_types[ID($demux)] = "*";
if (edges) {
- cell_types[ID($mux)] = "*";
cell_types[ID($pmux)] = "*";
}
diff --git a/techlibs/common/simlib.v b/techlibs/common/simlib.v
index e9129f690..b14488ff4 100644
--- a/techlibs/common/simlib.v
+++ b/techlibs/common/simlib.v
@@ -1292,6 +1292,33 @@ endmodule
// --------------------------------------------------------
+module \$bmux (A, S, Y);
+
+parameter WIDTH = 0;
+parameter S_WIDTH = 0;
+
+input [(WIDTH << S_WIDTH)-1:0] A;
+input [S_WIDTH-1:0] S;
+output [WIDTH-1:0] Y;
+
+wire [WIDTH-1:0] bm0_out, bm1_out;
+
+generate
+ if (S_WIDTH > 1) begin:muxlogic
+ \$bmux #(.WIDTH(WIDTH), .S_WIDTH(S_WIDTH-1)) bm0 (.A(A), .S(S[S_WIDTH-2:0]), .Y(bm0_out));
+ \$bmux #(.WIDTH(WIDTH), .S_WIDTH(S_WIDTH-1)) bm1 (.A(A[(WIDTH << S_WIDTH)-1:WIDTH << (S_WIDTH - 1)]), .S(S[S_WIDTH-2:0]), .Y(bm1_out));
+ assign Y = S[S_WIDTH-1] ? bm1_out : bm0_out;
+ end else if (S_WIDTH == 1) begin:simple
+ assign Y = S ? A[1] : A[0];
+ end else begin:passthru
+ assign Y = A;
+ end
+endgenerate
+
+endmodule
+
+// --------------------------------------------------------
+
module \$pmux (A, B, S, Y);
parameter WIDTH = 0;
@@ -1317,6 +1344,26 @@ end
endmodule
+// --------------------------------------------------------
+
+module \$demux (A, S, Y);
+
+parameter WIDTH = 1;
+parameter S_WIDTH = 1;
+
+input [WIDTH-1:0] A;
+input [S_WIDTH-1:0] S;
+output [(WIDTH << S_WIDTH)-1:0] Y;
+
+genvar i;
+generate
+ for (i = 0; i < (1 << S_WIDTH); i = i + 1) begin:slices
+ assign Y[i*WIDTH+:WIDTH] = (S == i) ? A : 0;
+ end
+endgenerate
+
+endmodule
+
// --------------------------------------------------------
`ifndef SIMLIB_NOLUT
@@ -1326,30 +1373,9 @@ parameter WIDTH = 0;
parameter LUT = 0;
input [WIDTH-1:0] A;
-output reg Y;
-
-wire lut0_out, lut1_out;
+output Y;
-generate
- if (WIDTH <= 1) begin:simple
- assign {lut1_out, lut0_out} = LUT;
- end else begin:complex
- \$lut #( .WIDTH(WIDTH-1), .LUT(LUT ) ) lut0 ( .A(A[WIDTH-2:0]), .Y(lut0_out) );
- \$lut #( .WIDTH(WIDTH-1), .LUT(LUT >> (2**(WIDTH-1))) ) lut1 ( .A(A[WIDTH-2:0]), .Y(lut1_out) );
- end
-
- if (WIDTH > 0) begin:lutlogic
- always @* begin
- casez ({A[WIDTH-1], lut0_out, lut1_out})
- 3'b?11: Y = 1'b1;
- 3'b?00: Y = 1'b0;
- 3'b0??: Y = lut0_out;
- 3'b1??: Y = lut1_out;
- default: Y = 1'bx;
- endcase
- end
- end
-endgenerate
+\$bmux #(.WIDTH(1), .S_WIDTH(WIDTH)) mux(.A(LUT), .S(A), .Y(Y));
endmodule
diff --git a/techlibs/common/techmap.v b/techlibs/common/techmap.v
index 667773e1b..91d385b80 100644
--- a/techlibs/common/techmap.v
+++ b/techlibs/common/techmap.v
@@ -59,7 +59,7 @@ module _90_simplemap_compare_ops;
endmodule
(* techmap_simplemap *)
-(* techmap_celltype = "$pos $slice $concat $mux $tribuf" *)
+(* techmap_celltype = "$pos $slice $concat $mux $tribuf $bmux" *)
module _90_simplemap_various;
endmodule
@@ -597,6 +597,43 @@ module _90_pmux (A, B, S, Y);
assign Y = |S ? Y_B : A;
endmodule
+// --------------------------------------------------------
+// Demultiplexers
+// --------------------------------------------------------
+
+(* techmap_celltype = "$demux" *)
+module _90_demux (A, S, Y);
+ parameter WIDTH = 1;
+ parameter S_WIDTH = 1;
+
+ (* force_downto *)
+ input [WIDTH-1:0] A;
+ (* force_downto *)
+ input [S_WIDTH-1:0] S;
+ (* force_downto *)
+ output [(WIDTH << S_WIDTH)-1:0] Y;
+
+ generate
+ if (S_WIDTH == 0) begin
+ assign Y = A;
+ end else if (S_WIDTH == 1) begin
+ assign Y[0+:WIDTH] = S ? 0 : A;
+ assign Y[WIDTH+:WIDTH] = S ? A : 0;
+ end else begin
+ localparam SPLIT = S_WIDTH / 2;
+ wire [(1 << (S_WIDTH-SPLIT))-1:0] YH;
+ wire [(1 << SPLIT)-1:0] YL;
+ $demux #(.WIDTH(1), .S_WIDTH(SPLIT)) lo (.A(1'b1), .S(S[SPLIT-1:0]), .Y(YL));
+ $demux #(.WIDTH(1), .S_WIDTH(S_WIDTH-SPLIT)) hi (.A(1'b1), .S(S[S_WIDTH-1:SPLIT]), .Y(YH));
+ genvar i;
+ for (i = 0; i < (1 << S_WIDTH); i = i + 1) begin
+ localparam [S_WIDTH-1:0] IDX = i;
+ assign Y[i*WIDTH+:WIDTH] = (YL[IDX[SPLIT-1:0]] & YH[IDX[S_WIDTH-1:SPLIT]]) ? A : 0;
+ end
+ end
+ endgenerate
+endmodule
+
// --------------------------------------------------------
// LUTs
--
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