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https://github.com/c64scene-ar/llvm-6502.git
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2da8bc8a5f
DAG scheduling during isel. Most new functionality is currently guarded by -enable-sched-cycles and -enable-sched-hazard. Added InstrItineraryData::IssueWidth field, currently derived from ARM itineraries, but could be initialized differently on other targets. Added ScheduleHazardRecognizer::MaxLookAhead to indicate whether it is active, and if so how many cycles of state it holds. Added SchedulingPriorityQueue::HasReadyFilter to allowing gating entry into the scheduler's available queue. ScoreboardHazardRecognizer now accesses the ScheduleDAG in order to get information about it's SUnits, provides RecedeCycle for bottom-up scheduling, correctly computes scoreboard depth, tracks IssueCount, and considers potential stall cycles when checking for hazards. ScheduleDAGRRList now models machine cycles and hazards (under flags). It tracks MinAvailableCycle, drives the hazard recognizer and priority queue's ready filter, manages a new PendingQueue, properly accounts for stall cycles, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122541 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
//===-- PPCHazardRecognizers.h - PowerPC Hazard Recognizers -----*- 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 defines hazard recognizers for scheduling on PowerPC processors.
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//
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//===----------------------------------------------------------------------===//
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#ifndef PPCHAZRECS_H
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#define PPCHAZRECS_H
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#include "llvm/CodeGen/ScheduleHazardRecognizer.h"
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include "PPCInstrInfo.h"
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namespace llvm {
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/// PPCHazardRecognizer970 - This class defines a finite state automata that
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/// models the dispatch logic on the PowerPC 970 (aka G5) processor. This
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/// promotes good dispatch group formation and implements noop insertion to
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/// avoid structural hazards that cause significant performance penalties (e.g.
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/// setting the CTR register then branching through it within a dispatch group),
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/// or storing then loading from the same address within a dispatch group.
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class PPCHazardRecognizer970 : public ScheduleHazardRecognizer {
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const TargetInstrInfo &TII;
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unsigned NumIssued; // Number of insts issued, including advanced cycles.
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// Various things that can cause a structural hazard.
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// HasCTRSet - If the CTR register is set in this group, disallow BCTRL.
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bool HasCTRSet;
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// StoredPtr - Keep track of the address of any store. If we see a load from
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// the same address (or one that aliases it), disallow the store. We can have
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// up to four stores in one dispatch group, hence we track up to 4.
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//
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// This is null if we haven't seen a store yet. We keep track of both
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// operands of the store here, since we support [r+r] and [r+i] addressing.
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SDValue StorePtr1[4], StorePtr2[4];
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unsigned StoreSize[4];
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unsigned NumStores;
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public:
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PPCHazardRecognizer970(const TargetInstrInfo &TII);
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virtual HazardType getHazardType(SUnit *SU, int Stalls);
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virtual void EmitInstruction(SUnit *SU);
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virtual void AdvanceCycle();
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private:
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/// EndDispatchGroup - Called when we are finishing a new dispatch group.
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///
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void EndDispatchGroup();
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/// GetInstrType - Classify the specified powerpc opcode according to its
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/// pipeline.
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PPCII::PPC970_Unit GetInstrType(unsigned Opcode,
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bool &isFirst, bool &isSingle,bool &isCracked,
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bool &isLoad, bool &isStore);
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bool isLoadOfStoredAddress(unsigned LoadSize,
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SDValue Ptr1, SDValue Ptr2) const;
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};
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} // end namespace llvm
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#endif
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