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134b2a5907
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. llvm-svn: 122541
142 lines
3.5 KiB
C++
142 lines
3.5 KiB
C++
//===-- SPUHazardRecognizers.cpp - Cell Hazard Recognizer Impls -----------===//
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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 hazard recognizers for scheduling on Cell SPU
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// processors.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "sched"
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#include "SPUHazardRecognizers.h"
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#include "SPU.h"
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#include "SPUInstrInfo.h"
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#include "llvm/CodeGen/ScheduleDAG.h"
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#include "llvm/CodeGen/SelectionDAGNodes.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Cell SPU hazard recognizer
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//
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// This is the pipeline hazard recognizer for the Cell SPU processor. It does
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// very little right now.
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//===----------------------------------------------------------------------===//
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SPUHazardRecognizer::SPUHazardRecognizer(const TargetInstrInfo &tii) :
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TII(tii),
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EvenOdd(0)
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{
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}
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/// Return the pipeline hazard type encountered or generated by this
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/// instruction. Currently returns NoHazard.
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///
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/// \return NoHazard
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ScheduleHazardRecognizer::HazardType
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SPUHazardRecognizer::getHazardType(SUnit *SU, int Stalls)
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{
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// Initial thoughts on how to do this, but this code cannot work unless the
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// function's prolog and epilog code are also being scheduled so that we can
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// accurately determine which pipeline is being scheduled.
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#if 0
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assert(Stalls == 0 && "SPU hazards don't yet support scoreboard lookahead");
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const SDNode *Node = SU->getNode()->getFlaggedMachineNode();
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ScheduleHazardRecognizer::HazardType retval = NoHazard;
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bool mustBeOdd = false;
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switch (Node->getOpcode()) {
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case SPU::LQDv16i8:
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case SPU::LQDv8i16:
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case SPU::LQDv4i32:
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case SPU::LQDv4f32:
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case SPU::LQDv2f64:
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case SPU::LQDr128:
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case SPU::LQDr64:
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case SPU::LQDr32:
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case SPU::LQDr16:
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case SPU::LQAv16i8:
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case SPU::LQAv8i16:
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case SPU::LQAv4i32:
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case SPU::LQAv4f32:
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case SPU::LQAv2f64:
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case SPU::LQAr128:
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case SPU::LQAr64:
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case SPU::LQAr32:
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case SPU::LQXv4i32:
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case SPU::LQXr128:
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case SPU::LQXr64:
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case SPU::LQXr32:
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case SPU::LQXr16:
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case SPU::STQDv16i8:
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case SPU::STQDv8i16:
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case SPU::STQDv4i32:
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case SPU::STQDv4f32:
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case SPU::STQDv2f64:
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case SPU::STQDr128:
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case SPU::STQDr64:
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case SPU::STQDr32:
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case SPU::STQDr16:
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case SPU::STQDr8:
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case SPU::STQAv16i8:
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case SPU::STQAv8i16:
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case SPU::STQAv4i32:
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case SPU::STQAv4f32:
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case SPU::STQAv2f64:
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case SPU::STQAr128:
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case SPU::STQAr64:
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case SPU::STQAr32:
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case SPU::STQAr16:
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case SPU::STQAr8:
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case SPU::STQXv16i8:
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case SPU::STQXv8i16:
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case SPU::STQXv4i32:
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case SPU::STQXv4f32:
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case SPU::STQXv2f64:
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case SPU::STQXr128:
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case SPU::STQXr64:
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case SPU::STQXr32:
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case SPU::STQXr16:
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case SPU::STQXr8:
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case SPU::RET:
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mustBeOdd = true;
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break;
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default:
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// Assume that this instruction can be on the even pipe
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break;
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}
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if (mustBeOdd && !EvenOdd)
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retval = Hazard;
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DEBUG(errs() << "SPUHazardRecognizer EvenOdd " << EvenOdd << " Hazard "
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<< retval << "\n");
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EvenOdd ^= 1;
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return retval;
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#else
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return NoHazard;
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#endif
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}
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void SPUHazardRecognizer::EmitInstruction(SUnit *SU)
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{
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}
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void SPUHazardRecognizer::AdvanceCycle()
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{
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DEBUG(errs() << "SPUHazardRecognizer::AdvanceCycle\n");
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}
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void SPUHazardRecognizer::EmitNoop()
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{
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AdvanceCycle();
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}
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