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//===---------------------- FetchStage.cpp ----------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \file
///
/// This file defines the Fetch stage of an instruction pipeline. Its sole
/// purpose in life is to produce instructions for the rest of the pipeline.
///
//===----------------------------------------------------------------------===//
#include "FetchStage.h"
namespace mca {
bool FetchStage::hasWorkToComplete() const { return SM.hasNext(); }
bool FetchStage::execute(InstRef &IR) {
if (!SM.hasNext())
return false;
const SourceRef SR = SM.peekNext();
std::unique_ptr<Instruction> I = IB.createInstruction(*SR.second);
IR = InstRef(SR.first, I.get());
Instructions[IR.getSourceIndex()] = std::move(I);
return true;
}
void FetchStage::postExecute() { SM.updateNext(); }
void FetchStage::cycleEnd() {
// Find the first instruction which hasn't been retired.
const InstMap::iterator It =
llvm::find_if(Instructions, [](const InstMap::value_type &KeyValuePair) {
return !KeyValuePair.second->isRetired();
});
// Erase instructions up to the first that hasn't been retired.
if (It != Instructions.begin())
Instructions.erase(Instructions.begin(), It);
}
} // namespace mca
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