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wreduce: Refactor to use FfInitVals.

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This commit is contained in:
Marcelina Kościelnicka 2020-07-19 02:19:23 +02:00
parent 7b1a4fc1e6
commit 4d9105ccb0
1 changed files with 7 additions and 37 deletions
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44
passes/opt/wreduce.cc
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@ -20,6 +20,7 @@
#include "kernel/yosys.h"
#include "kernel/sigtools.h"
#include "kernel/modtools.h"
#include "kernel/ffinit.h"
USING_YOSYS_NAMESPACE
@ -54,8 +55,7 @@ struct WreduceWorker
std::set<Cell*, IdString::compare_ptr_by_name<Cell>> work_queue_cells;
std::set<SigBit> work_queue_bits;
pool<SigBit> keep_bits;
dict<SigBit, State> init_bits;
pool<SigBit> remove_init_bits;
FfInitVals initvals;
WreduceWorker(WreduceConfig *config, Module *module) :
config(config), module(module), mi(module) { }
@ -145,7 +145,7 @@ struct WreduceWorker
SigSpec sig_d = mi.sigmap(cell->getPort(ID::D));
SigSpec sig_q = mi.sigmap(cell->getPort(ID::Q));
bool has_reset = false;
Const initval, rst_value;
Const initval = initvals(sig_q), rst_value;
int width_before = GetSize(sig_q);
@ -163,20 +163,12 @@ struct WreduceWorker
bool zero_ext = sig_d[GetSize(sig_d)-1] == State::S0;
bool sign_ext = !zero_ext;
for (int i = 0; i < GetSize(sig_q); i++) {
SigBit bit = sig_q[i];
if (init_bits.count(bit))
initval.bits.push_back(init_bits.at(bit));
else
initval.bits.push_back(State::Sx);
}
for (int i = GetSize(sig_q)-1; i >= 0; i--)
{
if (zero_ext && sig_d[i] == State::S0 && (initval[i] == State::S0 || initval[i] == State::Sx) &&
(!has_reset || i >= GetSize(rst_value) || rst_value[i] == State::S0 || rst_value[i] == State::Sx)) {
module->connect(sig_q[i], State::S0);
remove_init_bits.insert(sig_q[i]);
initvals.remove_init(sig_q[i]);
sig_d.remove(i);
sig_q.remove(i);
continue;
@ -185,7 +177,7 @@ struct WreduceWorker
if (sign_ext && i > 0 && sig_d[i] == sig_d[i-1] && initval[i] == initval[i-1] &&
(!has_reset || i >= GetSize(rst_value) || rst_value[i] == rst_value[i-1])) {
module->connect(sig_q[i], sig_q[i-1]);
remove_init_bits.insert(sig_q[i]);
initvals.remove_init(sig_q[i]);
sig_d.remove(i);
sig_q.remove(i);
continue;
@ -195,7 +187,7 @@ struct WreduceWorker
if (info == nullptr)
return;
if (!info->is_output && GetSize(info->ports) == 1 && !keep_bits.count(mi.sigmap(sig_q[i]))) {
remove_init_bits.insert(sig_q[i]);
initvals.remove_init(sig_q[i]);
sig_d.remove(i);
sig_q.remove(i);
zero_ext = false;
@ -409,18 +401,12 @@ struct WreduceWorker
{
// 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);
if (w->attributes.count(ID::init)) {
Const initval = w->attributes.at(ID::init);
SigSpec initsig = init_attr_sigmap(w);
int width = std::min(GetSize(initval), GetSize(initsig));
for (int i = 0; i < width; i++)
init_bits[initsig[i]] = initval[i];
}
}
for (auto c : module->selected_cells())
@ -469,22 +455,6 @@ struct WreduceWorker
module->connect(nw, SigSpec(w).extract(0, GetSize(nw)));
module->swap_names(w, nw);
}
if (!remove_init_bits.empty()) {
for (auto w : module->wires()) {
if (w->attributes.count(ID::init)) {
Const initval = w->attributes.at(ID::init);
Const new_initval(State::Sx, GetSize(w));
SigSpec initsig = init_attr_sigmap(w);
int width = std::min(GetSize(initval), GetSize(initsig));
for (int i = 0; i < width; i++) {
if (!remove_init_bits.count(initsig[i]))
new_initval[i] = initval[i];
}
w->attributes.at(ID::init) = new_initval;
}
}
}
}
};