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//===---------------------- RetireStage.cpp ---------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines the retire stage of an instruction pipeline.
/// The RetireStage represents the process logic that interacts with the
/// simulated RetireControlUnit hardware.
///
//===----------------------------------------------------------------------===//
#include "llvm/MCA/Stages/RetireStage.h"
#include "llvm/MCA/HWEventListener.h"
#include "llvm/Support/Debug.h"
#define DEBUG_TYPE "llvm-mca"
namespace llvm {
namespace mca {
llvm::Error RetireStage::cycleStart() {
if (RCU.isEmpty())
return llvm::ErrorSuccess();
const unsigned MaxRetirePerCycle = RCU.getMaxRetirePerCycle();
unsigned NumRetired = 0;
while (!RCU.isEmpty()) {
if (MaxRetirePerCycle != 0 && NumRetired == MaxRetirePerCycle)
break;
const RetireControlUnit::RUToken &Current = RCU.peekCurrentToken();
if (!Current.Executed)
break;
RCU.consumeCurrentToken();
notifyInstructionRetired(Current.IR);
NumRetired++;
}
return llvm::ErrorSuccess();
}
llvm::Error RetireStage::execute(InstRef &IR) {
RCU.onInstructionExecuted(IR.getInstruction()->getRCUTokenID());
return llvm::ErrorSuccess();
}
void RetireStage::notifyInstructionRetired(const InstRef &IR) const {
LLVM_DEBUG(llvm::dbgs() << "[E] Instruction Retired: #" << IR << '\n');
llvm::SmallVector<unsigned, 4> FreedRegs(PRF.getNumRegisterFiles());
const Instruction &Inst = *IR.getInstruction();
for (const WriteState &WS : Inst.getDefs())
PRF.removeRegisterWrite(WS, FreedRegs);
notifyEvent<HWInstructionEvent>(HWInstructionRetiredEvent(IR, FreedRegs));
}
} // namespace mca
} // namespace llvm
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