127 lines
3.5 KiB
C++
127 lines
3.5 KiB
C++
// OpenSTA, Static Timing Analyzer
|
|
// Copyright (c) 2026, Parallax Software, Inc.
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
//
|
|
// The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software.
|
|
//
|
|
// Altered source versions must be plainly marked as such, and must not be
|
|
// misrepresented as being the original software.
|
|
//
|
|
// This notice may not be removed or altered from any source distribution.
|
|
|
|
#pragma once
|
|
|
|
#include <vector>
|
|
|
|
#include "MinMax.hh"
|
|
#include "NetworkClass.hh"
|
|
#include "SdcClass.hh"
|
|
#include "Sta.hh"
|
|
#include "BoundedHeap.hh"
|
|
|
|
namespace sta {
|
|
|
|
class StaState;
|
|
|
|
class FanoutCheck
|
|
{
|
|
public:
|
|
FanoutCheck();
|
|
FanoutCheck(const Pin *pin,
|
|
float fanout,
|
|
float limit,
|
|
float slack,
|
|
const Mode *mode);
|
|
bool isNull() { return pin_ == nullptr; }
|
|
const Pin *pin() const { return pin_; }
|
|
float fanout() const { return fanout_; }
|
|
float limit() const { return limit_; }
|
|
float slack() const { return slack_; }
|
|
const Mode *mode() const { return mode_; }
|
|
|
|
private:
|
|
const Pin *pin_;
|
|
float fanout_;
|
|
float limit_;
|
|
float slack_;
|
|
const Mode *mode_;
|
|
};
|
|
|
|
class FanoutCheckSlackLess
|
|
{
|
|
public:
|
|
FanoutCheckSlackLess(const StaState *sta);
|
|
bool operator()(const FanoutCheck &check1,
|
|
const FanoutCheck &check2) const;
|
|
|
|
private:
|
|
const StaState *sta_;
|
|
};
|
|
|
|
using FanoutCheckSeq = std::vector<FanoutCheck>;
|
|
using FanoutCheckHeap = BoundedHeap<FanoutCheck, FanoutCheckSlackLess>;
|
|
|
|
class CheckFanouts
|
|
{
|
|
public:
|
|
CheckFanouts(const Sta *sta);
|
|
void clear();
|
|
// Return pins with the min/max fanout limit slack.
|
|
// net=null check all nets
|
|
FanoutCheckSeq &check(const Net *net,
|
|
size_t max_count,
|
|
bool violators,
|
|
const ModeSeq &modes,
|
|
const MinMax *min_max);
|
|
FanoutCheck check(const Pin *pin,
|
|
const Mode*mode,
|
|
const MinMax *min_max) const;
|
|
|
|
protected:
|
|
void checkNet(const Net *net,
|
|
bool violators,
|
|
const ModeSeq &modes,
|
|
const MinMax *min_max);
|
|
void checkAll(bool violators,
|
|
const ModeSeq &modes,
|
|
const MinMax *min_max);
|
|
void checkInst(const Instance *inst,
|
|
bool violators,
|
|
const ModeSeq &modes,
|
|
const MinMax *min_max);
|
|
void checkPin(const Pin *pin,
|
|
bool violators,
|
|
const ModeSeq &modes,
|
|
const MinMax *min_max);
|
|
bool checkPin(const Pin *pin,
|
|
const Mode *mode) const;
|
|
|
|
void findLimit(const Pin *pin,
|
|
const Sdc *sdc,
|
|
const MinMax *min_max,
|
|
// Return values.
|
|
float &limit,
|
|
bool &limit_exists) const;
|
|
float fanoutLoad(const Pin *pin) const;
|
|
|
|
const Sta *sta_;
|
|
FanoutCheckSeq checks_;
|
|
FanoutCheckHeap heap_;
|
|
};
|
|
|
|
} // namespace
|
|
|