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Post placement optimization for CY

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This commit is contained in:
Miodrag Milanovic 2024-06-17 10:05:25 +02:00
parent cfbd6f1967
commit 936d658283
2 changed files with 47 additions and 2 deletions
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1
himbaechel/uarch/ng-ultra/ng_ultra.h
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@ -45,6 +45,7 @@ struct NgUltraImpl : HimbaechelAPI
// Flow management
void pack() override;
void postPlace() override;
void preRoute() override;
void postRoute() override;

48
himbaechel/uarch/ng-ultra/pack.cc
View File

@ -20,6 +20,7 @@
#include "pack.h"
#include <algorithm>
#include <boost/algorithm/string.hpp>
#include <boost/optional.hpp>
#include <iterator>
#include <queue>
@ -73,13 +74,16 @@ void NgUltraPacker::pack_constants(void)
h.replace_constants(CellTypePort(id_BEYOND_FE, id_LO), CellTypePort(id_BEYOND_FE, id_LO), vcc_params, gnd_params);
}
void NgUltraPacker::remove_constants()
void remove_constants(Context *ctx)
{
log_info("Removing constants..\n");
auto fnd_cell = ctx->cells.find(ctx->id("$PACKER_VCC_DRV"));
if (fnd_cell != ctx->cells.end()) {
auto fnd_net = ctx->nets.find(ctx->id("$PACKER_VCC"));
if (fnd_net != ctx->nets.end() && fnd_net->second->users.entries()==0) {
BelId bel = (*fnd_cell).second.get()->bel;
if (bel != BelId())
ctx->unbindBel(bel);
ctx->cells.erase(fnd_cell);
ctx->nets.erase(fnd_net);
log_info(" Removed unused VCC cell\n");
@ -89,6 +93,9 @@ void NgUltraPacker::remove_constants()
if (fnd_cell != ctx->cells.end()) {
auto fnd_net = ctx->nets.find(ctx->id("$PACKER_GND"));
if (fnd_net != ctx->nets.end() && fnd_net->second->users.entries()==0) {
BelId bel = (*fnd_cell).second.get()->bel;
if (bel != BelId())
ctx->unbindBel(bel);
ctx->cells.erase(fnd_cell);
ctx->nets.erase(fnd_net);
log_info(" Removed unused GND cell\n");
@ -1261,10 +1268,47 @@ void NgUltraImpl::pack()
packer.pack_cys();
packer.pack_lut_dffs();
packer.pack_dffs();
packer.remove_constants();
packer.promote_globals();
}
void NgUltraImpl::postPlace()
{
log_break();
log_info("Limiting routing...\n");
for (auto &cell : ctx->cells) {
CellInfo &ci = *cell.second;
if (!ci.type.in(id_CY))
continue;
// In case A input is actually used, but it is connectd to GND
// it is considered that signal is comming from RI1 crossbar.
// We need to prevent router to use that crossbar output for
// any other signal.
Loc loc = ctx->getBelLocation(ci.bel);
for (int i=1;i<=4;i++) {
IdString port = ctx->idf("A%d",i);
NetInfo *net = ci.getPort(port);
if (!net)
continue;
if (net->name.in(ctx->id("$PACKER_GND"))) {
BelId bel = ctx->getBelByLocation(loc);
WireId dwire = ctx->getBelPinWire(bel, port);
for (PipId pip : ctx->getPipsUphill(dwire)) {
WireId src = ctx->getPipSrcWire(pip);
std::string src_name = ctx->getWireName(src)[1].c_str(ctx);
if (boost::starts_with(src_name,"RI1")) {
for (PipId pip2 : ctx->getPipsDownhill(src)) {
blocked_pips.emplace(pip2);
}
}
}
ci.disconnectPort(port); // Disconnect A
}
}
}
remove_constants(ctx);
}
void NgUltraImpl::route_clocks()
{
log_info("Routing global clocks...\n");