From: Evan Cheng Date: Thu, 20 May 2010 23:26:43 +0000 (+0000) Subject: Allow targets more controls on what nodes are scheduled by reg pressure, what for... X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1cc3984148be113c6e5e470f23c9ddbd37679c5f;p=oota-llvm.git Allow targets more controls on what nodes are scheduled by reg pressure, what for latency in hybrid mode. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104293 91177308-0d34-0410-b5e6-96231b3b80d8 --- diff --git a/include/llvm/CodeGen/ScheduleDAG.h b/include/llvm/CodeGen/ScheduleDAG.h index 3c59a5ac11e..9478806dcd5 100644 --- a/include/llvm/CodeGen/ScheduleDAG.h +++ b/include/llvm/CodeGen/ScheduleDAG.h @@ -16,6 +16,7 @@ #define LLVM_CODEGEN_SCHEDULEDAG_H #include "llvm/CodeGen/MachineBasicBlock.h" +#include "llvm/Target/TargetMachine.h" #include "llvm/ADT/DenseMap.h" #include "llvm/ADT/BitVector.h" #include "llvm/ADT/GraphTraits.h" @@ -238,7 +239,7 @@ namespace llvm { typedef SmallVector::iterator succ_iterator; typedef SmallVector::const_iterator const_pred_iterator; typedef SmallVector::const_iterator const_succ_iterator; - + unsigned NodeNum; // Entry # of node in the node vector. unsigned NodeQueueId; // Queue id of node. unsigned short Latency; // Node latency. @@ -255,6 +256,7 @@ namespace llvm { bool isScheduled : 1; // True once scheduled. bool isScheduleHigh : 1; // True if preferable to schedule high. bool isCloned : 1; // True if this node has been cloned. + Sched::Preference SchedulingPref; // Scheduling preference. SmallVector DbgInstrList; // dbg_values referencing this. private: @@ -275,6 +277,7 @@ namespace llvm { hasPhysRegDefs(false), hasPhysRegClobbers(false), isPending(false), isAvailable(false), isScheduled(false), isScheduleHigh(false), isCloned(false), + SchedulingPref(Sched::None), isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0), CopyDstRC(NULL), CopySrcRC(NULL) {} @@ -287,6 +290,7 @@ namespace llvm { hasPhysRegDefs(false), hasPhysRegClobbers(false), isPending(false), isAvailable(false), isScheduled(false), isScheduleHigh(false), isCloned(false), + SchedulingPref(Sched::None), isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0), CopyDstRC(NULL), CopySrcRC(NULL) {} @@ -298,6 +302,7 @@ namespace llvm { hasPhysRegDefs(false), hasPhysRegClobbers(false), isPending(false), isAvailable(false), isScheduled(false), isScheduleHigh(false), isCloned(false), + SchedulingPref(Sched::None), isDepthCurrent(false), isHeightCurrent(false), Depth(0), Height(0), CopyDstRC(NULL), CopySrcRC(NULL) {} @@ -390,7 +395,7 @@ namespace llvm { return true; return false; } - + void dump(const ScheduleDAG *G) const; void dumpAll(const ScheduleDAG *G) const; void print(raw_ostream &O, const ScheduleDAG *G) const; diff --git a/include/llvm/Target/TargetLowering.h b/include/llvm/Target/TargetLowering.h index b06a7b93040..5efebe637e1 100644 --- a/include/llvm/Target/TargetLowering.h +++ b/include/llvm/Target/TargetLowering.h @@ -149,6 +149,13 @@ public: return SchedPreferenceInfo; } + /// getSchedulingPreference - Some scheduler, e.g. hybrid, can switch to + /// different scheduling heuristics for different nodes. This function returns + /// the preference (or none) for the given node. + virtual Sched::Preference getSchedulingPreference(SDNode *N) const { + return Sched::None; + } + /// getRegClassFor - Return the register class that should be used for the /// specified value type. virtual TargetRegisterClass *getRegClassFor(EVT VT) const { diff --git a/include/llvm/Target/TargetMachine.h b/include/llvm/Target/TargetMachine.h index a89288d1a8f..bffba181391 100644 --- a/include/llvm/Target/TargetMachine.h +++ b/include/llvm/Target/TargetMachine.h @@ -72,6 +72,7 @@ namespace CodeGenOpt { namespace Sched { enum Preference { + None, // No preference Latency, // Scheduling for shortest total latency. RegPressure, // Scheduling for lowest register pressure. Hybrid // Scheduling for both latency and register pressure. diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp index 98dd34fe163..0728cef4377 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp @@ -1256,8 +1256,10 @@ bool src_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const { } bool hybrid_ls_rr_sort::operator()(const SUnit *left, const SUnit *right) const{ - bool LStall = SPQ->getCurCycle() < left->getHeight(); - bool RStall = SPQ->getCurCycle() < right->getHeight(); + bool LStall = left->SchedulingPref == Sched::Latency && + SPQ->getCurCycle() < left->getHeight(); + bool RStall = right->SchedulingPref == Sched::Latency && + SPQ->getCurCycle() < right->getHeight(); // If scheduling one of the node will cause a pipeline stall, delay it. // If scheduling either one of the node will cause a pipeline stall, sort them // according to their height. diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp index f765409d9e2..3185c88b82b 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp @@ -19,6 +19,7 @@ #include "llvm/CodeGen/SelectionDAG.h" #include "llvm/Target/TargetMachine.h" #include "llvm/Target/TargetInstrInfo.h" +#include "llvm/Target/TargetLowering.h" #include "llvm/Target/TargetRegisterInfo.h" #include "llvm/Target/TargetSubtarget.h" #include "llvm/ADT/DenseMap.h" @@ -44,6 +45,24 @@ void ScheduleDAGSDNodes::Run(SelectionDAG *dag, MachineBasicBlock *bb, ScheduleDAG::Run(bb, insertPos); } +/// NewSUnit - Creates a new SUnit and return a ptr to it. +/// +SUnit *ScheduleDAGSDNodes::NewSUnit(SDNode *N) { +#ifndef NDEBUG + const SUnit *Addr = 0; + if (!SUnits.empty()) + Addr = &SUnits[0]; +#endif + SUnits.push_back(SUnit(N, (unsigned)SUnits.size())); + assert((Addr == 0 || Addr == &SUnits[0]) && + "SUnits std::vector reallocated on the fly!"); + SUnits.back().OrigNode = &SUnits.back(); + SUnit *SU = &SUnits.back(); + const TargetLowering &TLI = DAG->getTargetLoweringInfo(); + SU->SchedulingPref = TLI.getSchedulingPreference(N); + return SU; +} + SUnit *ScheduleDAGSDNodes::Clone(SUnit *Old) { SUnit *SU = NewSUnit(Old->getNode()); SU->OrigNode = Old->OrigNode; @@ -52,6 +71,7 @@ SUnit *ScheduleDAGSDNodes::Clone(SUnit *Old) { SU->isCommutable = Old->isCommutable; SU->hasPhysRegDefs = Old->hasPhysRegDefs; SU->hasPhysRegClobbers = Old->hasPhysRegClobbers; + SU->SchedulingPref = Old->SchedulingPref; Old->isCloned = true; return SU; } diff --git a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h index 42c58c105b9..e8714ba8328 100644 --- a/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h +++ b/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h @@ -66,18 +66,7 @@ namespace llvm { /// NewSUnit - Creates a new SUnit and return a ptr to it. /// - SUnit *NewSUnit(SDNode *N) { -#ifndef NDEBUG - const SUnit *Addr = 0; - if (!SUnits.empty()) - Addr = &SUnits[0]; -#endif - SUnits.push_back(SUnit(N, (unsigned)SUnits.size())); - assert((Addr == 0 || Addr == &SUnits[0]) && - "SUnits std::vector reallocated on the fly!"); - SUnits.back().OrigNode = &SUnits.back(); - return &SUnits.back(); - } + SUnit *NewSUnit(SDNode *N); /// Clone - Creates a clone of the specified SUnit. It does not copy the /// predecessors / successors info nor the temporary scheduling states. diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp index 48f3bbfac90..340e8870443 100644 --- a/lib/Target/ARM/ARMISelLowering.cpp +++ b/lib/Target/ARM/ARMISelLowering.cpp @@ -466,6 +466,7 @@ ARMTargetLowering::ARMTargetLowering(TargetMachine &TM) setTargetDAGCombine(ISD::MUL); setStackPointerRegisterToSaveRestore(ARM::SP); + setSchedulingPreference(Sched::RegPressure); // FIXME: If-converter should use instruction latency to determine @@ -600,6 +601,15 @@ unsigned ARMTargetLowering::getFunctionAlignment(const Function *F) const { return getTargetMachine().getSubtarget().isThumb() ? 0 : 1; } +Sched::Preference ARMTargetLowering::getSchedulingPreference(SDNode *N) const { + for (unsigned i = 0, e = N->getNumValues(); i != e; ++i) { + EVT VT = N->getValueType(i); + if (VT.isFloatingPoint() || VT.isVector()) + return Sched::Latency; + } + return Sched::RegPressure; +} + //===----------------------------------------------------------------------===// // Lowering Code //===----------------------------------------------------------------------===// diff --git a/lib/Target/ARM/ARMISelLowering.h b/lib/Target/ARM/ARMISelLowering.h index 54dfb429c23..6a03d10fe48 100644 --- a/lib/Target/ARM/ARMISelLowering.h +++ b/lib/Target/ARM/ARMISelLowering.h @@ -247,6 +247,8 @@ namespace llvm { /// getFunctionAlignment - Return the Log2 alignment of this function. virtual unsigned getFunctionAlignment(const Function *F) const; + Sched::Preference getSchedulingPreference(SDNode *N) const; + bool isShuffleMaskLegal(const SmallVectorImpl &M, EVT VT) const; bool isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const;