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62 lines
2.1 KiB
C++
62 lines
2.1 KiB
C++
//=- llvm/CodeGen/ExactHazardRecognizer.h - Scheduling Support -*- C++ -*-=//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ExactHazardRecognizer class, which
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// implements hazard-avoidance heuristics for scheduling, based on the
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// scheduling itineraries specified for the target.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_EXACTHAZARDRECOGNIZER_H
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#define LLVM_CODEGEN_EXACTHAZARDRECOGNIZER_H
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#include "llvm/CodeGen/ScheduleHazardRecognizer.h"
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#include "llvm/CodeGen/ScheduleDAG.h"
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#include "llvm/Target/TargetInstrItineraries.h"
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namespace llvm {
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class ExactHazardRecognizer : public ScheduleHazardRecognizer {
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// Itinerary data for the target.
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const InstrItineraryData &ItinData;
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// Scoreboard to track function unit usage. Scoreboard[0] is a
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// mask of the FUs in use in the cycle currently being
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// schedule. Scoreboard[1] is a mask for the next cycle. The
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// Scoreboard is used as a circular buffer with the current cycle
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// indicated by ScoreboardHead.
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unsigned *Scoreboard;
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// The maximum number of cycles monitored by the Scoreboard. This
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// value is determined based on the target itineraries to ensure
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// that all hazards can be tracked.
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unsigned ScoreboardDepth;
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// Indices into the Scoreboard that represent the current cycle.
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unsigned ScoreboardHead;
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// Return the scoreboard index to use for 'offset' cycles in the
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// future. 'offset' of 0 returns ScoreboardHead.
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unsigned getFutureIndex(unsigned offset);
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// Print the scoreboard.
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void dumpScoreboard();
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public:
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ExactHazardRecognizer(const InstrItineraryData &ItinData);
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~ExactHazardRecognizer();
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virtual HazardType getHazardType(SUnit *SU);
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virtual void Reset();
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virtual void EmitInstruction(SUnit *SU);
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virtual void AdvanceCycle();
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};
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}
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#endif
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