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yosys/passes/opt/wreduce.cc
Robert O'Callahan 5600eb2e5b Update passes/opt to avoid bits()
2025-09-16 03:17:23 +00:00

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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
*
* 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"
#include "kernel/modtools.h"
#include "kernel/ffinit.h"
#include "kernel/utils.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct WreduceConfig
{
pool<IdString> supported_cell_types;
bool keepdc = false;
bool mux_undef = false;
WreduceConfig()
{
supported_cell_types = pool<IdString>({
ID($not), ID($pos), ID($neg),
ID($and), ID($or), ID($xor), ID($xnor),
ID($shl), ID($shr), ID($sshl), ID($sshr), ID($shift), ID($shiftx),
ID($lt), ID($le), ID($eq), ID($ne), ID($eqx), ID($nex), ID($ge), ID($gt),
ID($add), ID($sub), ID($mul), // ID($div), ID($mod), ID($divfloor), ID($modfloor), ID($pow),
ID($mux), ID($pmux),
ID($dff), ID($dffe), ID($adff), ID($adffe), ID($sdff), ID($sdffe), ID($sdffce),
ID($dlatch), ID($adlatch),
});
}
};
struct WreduceWorker
{
WreduceConfig *config;
Module *module;
ModIndex mi;
std::set<Cell*, IdString::compare_ptr_by_name<Cell>> work_queue_cells;
std::set<SigBit> work_queue_bits;
pool<SigBit> keep_bits;
FfInitVals initvals;
WreduceWorker(WreduceConfig *config, Module *module) :
config(config), module(module), mi(module) { }
void run_cell_mux(Cell *cell)
{
// Reduce size of MUX if inputs agree on a value for a bit or a output bit is unused
SigSpec sig_a = mi.sigmap(cell->getPort(ID::A));
SigSpec sig_b = mi.sigmap(cell->getPort(ID::B));
SigSpec sig_s = mi.sigmap(cell->getPort(ID::S));
SigSpec sig_y = mi.sigmap(cell->getPort(ID::Y));
std::vector<SigBit> bits_removed;
if (sig_y.has_const())
return;
for (int i = GetSize(sig_y)-1; i >= 0; i--)
{
auto info = mi.query(sig_y[i]);
if (!info->is_output && GetSize(info->ports) <= 1 && !keep_bits.count(mi.sigmap(sig_y[i]))) {
bits_removed.push_back(State::Sx);
continue;
}
SigBit ref = sig_a[i];
for (int k = 0; k < GetSize(sig_s); k++) {
if ((config->keepdc || !config->mux_undef || (ref != State::Sx && sig_b[k*GetSize(sig_a) + i] != State::Sx)) && ref != sig_b[k*GetSize(sig_a) + i])
goto no_match_ab;
if (sig_b[k*GetSize(sig_a) + i] != State::Sx)
ref = sig_b[k*GetSize(sig_a) + i];
}
if (0)
no_match_ab:
break;
bits_removed.push_back(ref);
}
if (bits_removed.empty())
return;
SigSpec sig_removed;
for (int i = GetSize(bits_removed)-1; i >= 0; i--)
sig_removed.append(bits_removed[i]);
if (GetSize(bits_removed) == GetSize(sig_y)) {
log("Removed cell %s.%s (%s).\n", log_id(module), log_id(cell), log_id(cell->type));
module->connect(sig_y, sig_removed);
module->remove(cell);
return;
}
log("Removed top %d bits (of %d) from mux cell %s.%s (%s).\n",
GetSize(sig_removed), GetSize(sig_y), log_id(module), log_id(cell), log_id(cell->type));
int n_removed = GetSize(sig_removed);
int n_kept = GetSize(sig_y) - GetSize(sig_removed);
SigSpec new_work_queue_bits;
new_work_queue_bits.append(sig_a.extract(n_kept, n_removed));
new_work_queue_bits.append(sig_y.extract(n_kept, n_removed));
SigSpec new_sig_a = sig_a.extract(0, n_kept);
SigSpec new_sig_y = sig_y.extract(0, n_kept);
SigSpec new_sig_b;
for (int k = 0; k < GetSize(sig_s); k++) {
new_sig_b.append(sig_b.extract(k*GetSize(sig_a), n_kept));
new_work_queue_bits.append(sig_b.extract(k*GetSize(sig_a) + n_kept, n_removed));
}
for (auto bit : new_work_queue_bits)
work_queue_bits.insert(bit);
cell->setPort(ID::A, new_sig_a);
cell->setPort(ID::B, new_sig_b);
cell->setPort(ID::Y, new_sig_y);
cell->fixup_parameters();
module->connect(sig_y.extract(n_kept, n_removed), sig_removed);
}
void run_cell_dff(Cell *cell)
{
// Reduce size of FF if inputs are just sign/zero extended or output bit is not used
SigSpec sig_d = mi.sigmap(cell->getPort(ID::D));
SigSpec sig_q = mi.sigmap(cell->getPort(ID::Q));
bool has_reset = false;
Const initval = initvals(sig_q), rst_value;
int width_before = GetSize(sig_q);
if (width_before == 0)
return;
if (cell->parameters.count(ID::ARST_VALUE)) {
rst_value = cell->parameters[ID::ARST_VALUE];
has_reset = true;
} else if (cell->parameters.count(ID::SRST_VALUE)) {
rst_value = cell->parameters[ID::SRST_VALUE];
has_reset = true;
}
bool zero_ext = sig_d[GetSize(sig_d)-1] == State::S0;
bool sign_ext = !zero_ext;
for (int i = GetSize(sig_q)-1; i >= 0; i--)
{
if (zero_ext && sig_d[i] == State::S0 && (initval[i] == State::S0 || (!config->keepdc && initval[i] == State::Sx)) &&
(!has_reset || i >= GetSize(rst_value) || rst_value[i] == State::S0 || (!config->keepdc && rst_value[i] == State::Sx))) {
module->connect(sig_q[i], State::S0);
initvals.remove_init(sig_q[i]);
sig_d.remove(i);
sig_q.remove(i);
continue;
}
if (sign_ext && i > 0 && sig_d[i] == sig_d[i-1] && initval[i] == initval[i-1] && (!config->keepdc || initval[i] != State::Sx) &&
(!has_reset || i >= GetSize(rst_value) || (rst_value[i] == rst_value[i-1] && (!config->keepdc || rst_value[i] != State::Sx)))) {
module->connect(sig_q[i], sig_q[i-1]);
initvals.remove_init(sig_q[i]);
sig_d.remove(i);
sig_q.remove(i);
continue;
}
auto info = mi.query(sig_q[i]);
if (info == nullptr)
return;
if (!info->is_output && GetSize(info->ports) == 1 && !keep_bits.count(mi.sigmap(sig_q[i]))) {
initvals.remove_init(sig_q[i]);
sig_d.remove(i);
sig_q.remove(i);
zero_ext = false;
sign_ext = false;
continue;
}
break;
}
if (width_before == GetSize(sig_q))
return;
if (GetSize(sig_q) == 0) {
log("Removed cell %s.%s (%s).\n", log_id(module), log_id(cell), log_id(cell->type));
module->remove(cell);
return;
}
log("Removed top %d bits (of %d) from FF cell %s.%s (%s).\n", width_before - GetSize(sig_q), width_before,
log_id(module), log_id(cell), log_id(cell->type));
for (auto bit : sig_d)
work_queue_bits.insert(bit);
for (auto bit : sig_q)
work_queue_bits.insert(bit);
// Narrow ARST_VALUE parameter to new size.
if (cell->parameters.count(ID::ARST_VALUE)) {
rst_value.resize(GetSize(sig_q), State::S0);
cell->setParam(ID::ARST_VALUE, rst_value);
} else if (cell->parameters.count(ID::SRST_VALUE)) {
rst_value.resize(GetSize(sig_q), State::S0);
cell->setParam(ID::SRST_VALUE, rst_value);
}
cell->setPort(ID::D, sig_d);
cell->setPort(ID::Q, sig_q);
cell->fixup_parameters();
}
void run_reduce_inport(Cell *cell, char port, int max_port_size, bool &port_signed, bool &did_something)
{
port_signed = cell->getParam(stringf("\\%c_SIGNED", port)).as_bool();
SigSpec sig = mi.sigmap(cell->getPort(stringf("\\%c", port)));
if (port == 'B' && cell->type.in(ID($shl), ID($shr), ID($sshl), ID($sshr)))
port_signed = false;
int bits_removed = 0;
if (GetSize(sig) > max_port_size) {
bits_removed = GetSize(sig) - max_port_size;
for (auto bit : sig.extract(max_port_size, bits_removed))
work_queue_bits.insert(bit);
sig = sig.extract(0, max_port_size);
}
if (port_signed) {
while (GetSize(sig) > 1 && sig[GetSize(sig)-1] == sig[GetSize(sig)-2])
work_queue_bits.insert(sig[GetSize(sig)-1]), sig.remove(GetSize(sig)-1), bits_removed++;
} else {
while (GetSize(sig) > 1 && sig[GetSize(sig)-1] == State::S0)
work_queue_bits.insert(sig[GetSize(sig)-1]), sig.remove(GetSize(sig)-1), bits_removed++;
}
if (bits_removed) {
log("Removed top %d bits (of %d) from port %c of cell %s.%s (%s).\n",
bits_removed, GetSize(sig) + bits_removed, port, log_id(module), log_id(cell), log_id(cell->type));
cell->setPort(stringf("\\%c", port), sig);
did_something = true;
}
}
int reduced_opsize(const SigSpec &inp, bool signed_)
{
int size = GetSize(inp);
if (signed_) {
while (size >= 2 && inp[size - 1] == inp[size - 2])
size--;
} else {
while (size >= 1 && inp[size - 1] == State::S0)
size--;
}
return size;
}
void run_cell(Cell *cell)
{
bool did_something = false;
if (!config->supported_cell_types.count(cell->type))
return;
if (cell->type.in(ID($mux), ID($pmux)))
return run_cell_mux(cell);
if (cell->type.in(ID($dff), ID($dffe), ID($adff), ID($adffe), ID($sdff), ID($sdffe), ID($sdffce), ID($dlatch), ID($adlatch)))
return run_cell_dff(cell);
SigSpec sig = mi.sigmap(cell->getPort(ID::Y));
if (sig.has_const())
return;
// Reduce size of ports A and B based on constant input bits and size of output port
int max_port_a_size = cell->hasPort(ID::A) ? GetSize(cell->getPort(ID::A)) : -1;
int max_port_b_size = cell->hasPort(ID::B) ? GetSize(cell->getPort(ID::B)) : -1;
if (cell->type.in(ID($not), ID($pos), ID($neg), ID($and), ID($or), ID($xor), ID($add), ID($sub))) {
max_port_a_size = min(max_port_a_size, GetSize(sig));
max_port_b_size = min(max_port_b_size, GetSize(sig));
}
bool port_a_signed = false;
bool port_b_signed = false;
// For some operations if the output is no wider than either of the inputs
// we are free to choose the signedness of the operands
if (cell->type.in(ID($mul), ID($add), ID($sub)) &&
max_port_a_size == GetSize(sig) &&
max_port_b_size == GetSize(sig)) {
SigSpec sig_a = mi.sigmap(cell->getPort(ID::A)), sig_b = mi.sigmap(cell->getPort(ID::B));
// Remove top bits from sig_a and sig_b which are not visible on the output
sig_a.extend_u0(max_port_a_size);
sig_b.extend_u0(max_port_b_size);
int signed_cost, unsigned_cost;
if (cell->type == ID($mul)) {
signed_cost = reduced_opsize(sig_a, true) * reduced_opsize(sig_b, true);
unsigned_cost = reduced_opsize(sig_a, false) * reduced_opsize(sig_b, false);
} else {
signed_cost = max(reduced_opsize(sig_a, true), reduced_opsize(sig_b, true));
unsigned_cost = max(reduced_opsize(sig_a, false), reduced_opsize(sig_b, false));
}
if (!port_a_signed && !port_b_signed && signed_cost < unsigned_cost) {
log("Converting cell %s.%s (%s) from unsigned to signed.\n",
log_id(module), log_id(cell), log_id(cell->type));
cell->setParam(ID::A_SIGNED, 1);
cell->setParam(ID::B_SIGNED, 1);
port_a_signed = true;
port_b_signed = true;
did_something = true;
} else if (port_a_signed && port_b_signed && unsigned_cost < signed_cost) {
log("Converting cell %s.%s (%s) from signed to unsigned.\n",
log_id(module), log_id(cell), log_id(cell->type));
cell->setParam(ID::A_SIGNED, 0);
cell->setParam(ID::B_SIGNED, 0);
port_a_signed = false;
port_b_signed = false;
did_something = true;
}
}
if (max_port_a_size >= 0 && cell->type != ID($shiftx))
run_reduce_inport(cell, 'A', max_port_a_size, port_a_signed, did_something);
if (max_port_b_size >= 0)
run_reduce_inport(cell, 'B', max_port_b_size, port_b_signed, did_something);
if (cell->hasPort(ID::A) && cell->hasPort(ID::B) && port_a_signed && port_b_signed) {
SigSpec sig_a = mi.sigmap(cell->getPort(ID::A)), sig_b = mi.sigmap(cell->getPort(ID::B));
if (GetSize(sig_a) > 0 && sig_a[GetSize(sig_a)-1] == State::S0 &&
GetSize(sig_b) > 0 && sig_b[GetSize(sig_b)-1] == State::S0) {
log("Converting cell %s.%s (%s) from signed to unsigned.\n",
log_id(module), log_id(cell), log_id(cell->type));
cell->setParam(ID::A_SIGNED, 0);
cell->setParam(ID::B_SIGNED, 0);
port_a_signed = false;
port_b_signed = false;
did_something = true;
}
}
if (cell->hasPort(ID::A) && !cell->hasPort(ID::B) && port_a_signed) {
SigSpec sig_a = mi.sigmap(cell->getPort(ID::A));
if (GetSize(sig_a) > 0 && sig_a[GetSize(sig_a)-1] == State::S0) {
log("Converting cell %s.%s (%s) from signed to unsigned.\n",
log_id(module), log_id(cell), log_id(cell->type));
cell->setParam(ID::A_SIGNED, 0);
port_a_signed = false;
did_something = true;
}
}
// Reduce size of port Y based on sizes for A and B and unused bits in Y
int bits_removed = 0;
if (port_a_signed && cell->type == ID($shr)) {
// do not reduce size of output on $shr cells with signed A inputs
} else {
while (GetSize(sig) > 0)
{
auto bit = sig[GetSize(sig)-1];
if (keep_bits.count(bit))
break;
auto info = mi.query(bit);
if (info->is_output || GetSize(info->ports) > 1)
break;
sig.remove(GetSize(sig)-1);
bits_removed++;
}
}
if (cell->type.in(ID($pos), ID($add), ID($mul), ID($and), ID($or), ID($xor), ID($sub)))
{
bool is_signed = cell->getParam(ID::A_SIGNED).as_bool() || cell->type == ID($sub);
int a_size = 0, b_size = 0;
if (cell->hasPort(ID::A)) a_size = GetSize(cell->getPort(ID::A));
if (cell->hasPort(ID::B)) b_size = GetSize(cell->getPort(ID::B));
int max_y_size = max(a_size, b_size);
if (cell->type.in(ID($add), ID($sub)))
max_y_size++;
if (cell->type == ID($mul))
max_y_size = a_size + b_size;
max_y_size = std::max(max_y_size, 1);
if (GetSize(sig) > max_y_size) {
SigSpec extra_bits = sig.extract(max_y_size, GetSize(sig) - max_y_size);
bits_removed += GetSize(extra_bits);
sig.remove(max_y_size, GetSize(extra_bits));
SigBit padbit = is_signed ? sig[GetSize(sig)-1] : State::S0;
module->connect(extra_bits, SigSpec(padbit, GetSize(extra_bits)));
}
}
if (GetSize(sig) == 0) {
log("Removed cell %s.%s (%s).\n", log_id(module), log_id(cell), log_id(cell->type));
module->remove(cell);
return;
}
if (bits_removed) {
log("Removed top %d bits (of %d) from port Y of cell %s.%s (%s).\n",
bits_removed, GetSize(sig) + bits_removed, log_id(module), log_id(cell), log_id(cell->type));
cell->setPort(ID::Y, sig);
did_something = true;
}
if (did_something) {
cell->fixup_parameters();
run_cell(cell);
}
}
static int count_nontrivial_wire_attrs(RTLIL::Wire *w)
{
int count = w->attributes.size();
count -= w->attributes.count(ID::src);
count -= w->attributes.count(ID::unused_bits);
return count;
}
void run()
{
// create a copy as mi.sigmap will be updated as we process the module
SigMap init_attr_sigmap = mi.sigmap;
initvals.set(&init_attr_sigmap, module);
for (auto w : module->wires()) {
if (w->get_bool_attribute(ID::keep))
for (auto bit : mi.sigmap(w))
keep_bits.insert(bit);
}
for (auto c : module->selected_cells())
work_queue_cells.insert(c);
while (!work_queue_cells.empty())
{
work_queue_bits.clear();
for (auto c : work_queue_cells)
run_cell(c);
work_queue_cells.clear();
for (auto bit : work_queue_bits)
for (auto port : mi.query_ports(bit))
if (module->selected(port.cell))
work_queue_cells.insert(port.cell);
}
pool<SigSpec> complete_wires;
for (auto w : module->wires())
complete_wires.insert(mi.sigmap(w));
for (auto w : module->selected_wires())
{
int unused_top_bits = 0;
if (w->port_id > 0 || count_nontrivial_wire_attrs(w) > 0)
continue;
for (int i = GetSize(w)-1; i >= 0; i--) {
SigBit bit(w, i);
auto info = mi.query(bit);
if (info && (info->is_input || info->is_output || GetSize(info->ports) > 0))
break;
unused_top_bits++;
}
if (unused_top_bits == 0 || unused_top_bits == GetSize(w))
continue;
if (complete_wires[mi.sigmap(w).extract(0, GetSize(w) - unused_top_bits)])
continue;
log("Removed top %d bits (of %d) from wire %s.%s.\n", unused_top_bits, GetSize(w), log_id(module), log_id(w));
Wire *nw = module->addWire(NEW_ID, GetSize(w) - unused_top_bits);
module->connect(nw, SigSpec(w).extract(0, GetSize(nw)));
module->swap_names(w, nw);
}
}
};
struct WreducePass : public Pass {
WreducePass() : Pass("wreduce", "reduce the word size of operations if possible") { }
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" wreduce [options] [selection]\n");
log("\n");
log("This command reduces the word size of operations. For example it will replace\n");
log("the 32 bit adders in the following code with adders of more appropriate widths:\n");
log("\n");
log(" module test(input [3:0] a, b, c, output [7:0] y);\n");
log(" assign y = a + b + c + 1;\n");
log(" endmodule\n");
log("\n");
log("Options:\n");
log("\n");
log(" -memx\n");
log(" Do not change the width of memory address ports. Use this options in\n");
log(" flows that use the 'memory_memx' pass.\n");
log("\n");
log(" -mux_undef\n");
log(" remove 'undef' inputs from $mux, $pmux and $_MUX_ cells\n");
log("\n");
log(" -keepdc\n");
log(" Do not optimize explicit don't-care values.\n");
log("\n");
}
void execute(std::vector<std::string> args, Design *design) override
{
WreduceConfig config;
bool opt_memx = false;
log_header(design, "Executing WREDUCE pass (reducing word size of cells).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-memx") {
opt_memx = true;
continue;
}
if (args[argidx] == "-keepdc") {
config.keepdc = true;
continue;
}
if (args[argidx] == "-mux_undef") {
config.mux_undef = true;
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
{
if (module->has_processes_warn())
continue;
for (auto c : module->selected_cells())
{
if (c->type.in(ID($reduce_and), ID($reduce_or), ID($reduce_xor), ID($reduce_xnor), ID($reduce_bool),
ID($lt), ID($le), ID($eq), ID($ne), ID($eqx), ID($nex), ID($ge), ID($gt),
ID($logic_not), ID($logic_and), ID($logic_or)) && GetSize(c->getPort(ID::Y)) > 1) {
SigSpec sig = c->getPort(ID::Y);
if (!sig.has_const()) {
c->setPort(ID::Y, sig[0]);
c->setParam(ID::Y_WIDTH, 1);
sig.remove(0);
module->connect(sig, Const(0, GetSize(sig)));
}
}
if (c->type.in(ID($div), ID($mod), ID($divfloor), ID($modfloor), ID($pow)))
{
SigSpec A = c->getPort(ID::A);
int original_a_width = GetSize(A);
if (c->getParam(ID::A_SIGNED).as_bool()) {
while (GetSize(A) > 1 && A[GetSize(A)-1] == State::S0 && A[GetSize(A)-2] == State::S0)
A.remove(GetSize(A)-1, 1);
} else {
while (GetSize(A) > 0 && A[GetSize(A)-1] == State::S0)
A.remove(GetSize(A)-1, 1);
}
if (original_a_width != GetSize(A)) {
log("Removed top %d bits (of %d) from port A of cell %s.%s (%s).\n",
original_a_width-GetSize(A), original_a_width, log_id(module), log_id(c), log_id(c->type));
c->setPort(ID::A, A);
c->setParam(ID::A_WIDTH, GetSize(A));
}
SigSpec B = c->getPort(ID::B);
int original_b_width = GetSize(B);
if (c->getParam(ID::B_SIGNED).as_bool()) {
while (GetSize(B) > 1 && B[GetSize(B)-1] == State::S0 && B[GetSize(B)-2] == State::S0)
B.remove(GetSize(B)-1, 1);
} else {
while (GetSize(B) > 0 && B[GetSize(B)-1] == State::S0)
B.remove(GetSize(B)-1, 1);
}
if (original_b_width != GetSize(B)) {
log("Removed top %d bits (of %d) from port B of cell %s.%s (%s).\n",
original_b_width-GetSize(B), original_b_width, log_id(module), log_id(c), log_id(c->type));
c->setPort(ID::B, B);
c->setParam(ID::B_WIDTH, GetSize(B));
}
}
if (!opt_memx && c->type.in(ID($memrd), ID($memrd_v2), ID($memwr), ID($memwr_v2), ID($meminit), ID($meminit_v2))) {
IdString memid = c->getParam(ID::MEMID).decode_string();
RTLIL::Memory *mem = module->memories.at(memid);
if (mem->start_offset >= 0) {
int cur_addrbits = c->getParam(ID::ABITS).as_int();
int max_addrbits = ceil_log2(mem->start_offset + mem->size);
if (cur_addrbits > max_addrbits) {
log("Removed top %d address bits (of %d) from memory %s port %s.%s (%s).\n",
cur_addrbits-max_addrbits, cur_addrbits,
c->type == ID($memrd) ? "read" : c->type == ID($memwr) ? "write" : "init",
log_id(module), log_id(c), log_id(memid));
c->setParam(ID::ABITS, max_addrbits);
c->setPort(ID::ADDR, c->getPort(ID::ADDR).extract(0, max_addrbits));
}
}
}
}
WreduceWorker worker(&config, module);
worker.run();
}
}
} WreducePass;
PRIVATE_NAMESPACE_END
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