Index: include/llvm/Analysis/OptimizationDiagnosticInfo.h =================================================================== --- include/llvm/Analysis/OptimizationDiagnosticInfo.h +++ include/llvm/Analysis/OptimizationDiagnosticInfo.h @@ -282,5 +282,11 @@ /// \brief Run the analysis pass over a function and produce BFI. Result run(Function &F, FunctionAnalysisManager &AM); }; + +namespace yaml { +template <> struct MappingTraits { + static void mapping(IO &io, DiagnosticInfoOptimizationBase *&OptDiag); +}; +} } #endif // LLVM_IR_OPTIMIZATIONDIAGNOSTICINFO_H Index: include/llvm/CodeGen/MachineLoopInfo.h =================================================================== --- include/llvm/CodeGen/MachineLoopInfo.h +++ include/llvm/CodeGen/MachineLoopInfo.h @@ -60,6 +60,13 @@ /// multiple exiting blocks are present. MachineBasicBlock *findLoopControlBlock(); + /// Return the debug location of the start of this loop. + /// This looks for a BB terminating instruction with a known debug + /// location by looking at the preheader and header blocks. If it + /// cannot find a terminating instruction with location information, + /// it returns an unknown location. + DebugLoc getStartLoc() const; + void dump() const; private: Index: include/llvm/CodeGen/MachineOptimizationRemarkEmitter.h =================================================================== --- /dev/null +++ include/llvm/CodeGen/MachineOptimizationRemarkEmitter.h @@ -0,0 +1,188 @@ +//===- MachineOptimizationRemarkEmitter.h - Opt Diagnostics -*- C++ -*-----===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// \file +// Optimization diagnostic interfaces for machine passes. It's packaged as an +// analysis pass so that by using this service passes become dependent on MBFI +// as well. MBFI is used to compute the "hotness" of the diagnostic message. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_CODEGEN_MACHINEOPTIMIZATIONREMARKEMITTER_H +#define LLVM_CODEGEN_MACHINEOPTIMIZATIONREMARKEMITTER_H + +#include "llvm/Analysis/OptimizationDiagnosticInfo.h" +#include "llvm/CodeGen/MachineFunctionPass.h" + +namespace llvm { +class MachineBasicBlock; +class MachineBlockFrequencyInfo; + +/// \brief Common features for diagnostics dealing with optimization remarks +/// that are used by machine passes. +class DiagnosticInfoMIROptimization : public DiagnosticInfoOptimizationBase { +public: + DiagnosticInfoMIROptimization(enum DiagnosticKind Kind, const char *PassName, + StringRef RemarkName, const DebugLoc &DLoc, + MachineBasicBlock *MBB) + : DiagnosticInfoOptimizationBase(Kind, DS_Remark, PassName, RemarkName, + *MBB->getParent()->getFunction(), DLoc), + MBB(MBB) {} + + static bool classof(const DiagnosticInfo *DI) { + return DI->getKind() >= DK_FirstMachineRemark && + DI->getKind() <= DK_LastMachineRemark; + } + + const MachineBasicBlock *getBlock() const { return MBB; } + +private: + MachineBasicBlock *MBB; +}; + +/// Diagnostic information for applied optimization remarks. +class MachineOptimizationRemark : public DiagnosticInfoMIROptimization { +public: + /// \p PassName is the name of the pass emitting this diagnostic. If this name + /// matches the regular expression given in -Rpass=, then the diagnostic will + /// be emitted. \p RemarkName is a textual identifier for the remark. \p + /// DLoc is the debug location and \p MBB is the block that the optimization + /// operates in. + MachineOptimizationRemark(const char *PassName, StringRef RemarkName, + const DebugLoc &DLoc, MachineBasicBlock *MBB) + : DiagnosticInfoMIROptimization(DK_MachineOptimizationRemark, PassName, + RemarkName, DLoc, MBB) {} + + static bool classof(const DiagnosticInfo *DI) { + return DI->getKind() == DK_MachineOptimizationRemark; + } + + /// \see DiagnosticInfoOptimizationBase::isEnabled. + bool isEnabled() const override { + return OptimizationRemark::isEnabled(getPassName()); + } +}; + +/// Diagnostic information for missed-optimization remarks. +class MachineOptimizationRemarkMissed : public DiagnosticInfoMIROptimization { +public: + /// \p PassName is the name of the pass emitting this diagnostic. If this name + /// matches the regular expression given in -Rpass-missed=, then the + /// diagnostic will be emitted. \p RemarkName is a textual identifier for the + /// remark. \p DLoc is the debug location and \p MBB is the block that the + /// optimization operates in. + MachineOptimizationRemarkMissed(const char *PassName, StringRef RemarkName, + const DebugLoc &DLoc, MachineBasicBlock *MBB) + : DiagnosticInfoMIROptimization(DK_MachineOptimizationRemarkMissed, + PassName, RemarkName, DLoc, MBB) {} + + static bool classof(const DiagnosticInfo *DI) { + return DI->getKind() == DK_MachineOptimizationRemarkMissed; + } + + /// \see DiagnosticInfoOptimizationBase::isEnabled. + bool isEnabled() const override { + return OptimizationRemarkMissed::isEnabled(getPassName()); + } +}; + +/// Diagnostic information for optimization analysis remarks. +class MachineOptimizationRemarkAnalysis : public DiagnosticInfoMIROptimization { +public: + /// \p PassName is the name of the pass emitting this diagnostic. If this name + /// matches the regular expression given in -Rpass-analysis=, then the + /// diagnostic will be emitted. \p RemarkName is a textual identifier for the + /// remark. \p DLoc is the debug location and \p MBB is the block that the + /// optimization operates in. + MachineOptimizationRemarkAnalysis(const char *PassName, StringRef RemarkName, + const DebugLoc &DLoc, + MachineBasicBlock *MBB) + : DiagnosticInfoMIROptimization(DK_MachineOptimizationRemarkAnalysis, + PassName, RemarkName, DLoc, MBB) {} + + static bool classof(const DiagnosticInfo *DI) { + return DI->getKind() == DK_MachineOptimizationRemarkAnalysis; + } + + /// \see DiagnosticInfoOptimizationBase::isEnabled. + bool isEnabled() const override { + return OptimizationRemarkAnalysis::isEnabled(getPassName()); + } +}; + +/// The optimization diagnostic interface. +/// +/// It allows reporting when optimizations are performed and when they are not +/// along with the reasons for it. Hotness information of the corresponding +/// code region can be included in the remark if DiagnosticHotnessRequested is +/// enabled in the LLVM context. +class MachineOptimizationRemarkEmitter { +public: + MachineOptimizationRemarkEmitter(MachineFunction &MF, + MachineBlockFrequencyInfo *MBFI) + : MF(MF), MBFI(MBFI) {} + + /// Emit an optimization remark. + void emit(DiagnosticInfoOptimizationBase &OptDiag); + + /// \brief Whether we allow for extra compile-time budget to perform more + /// analysis to be more informative. + /// + /// This is useful to enable additional missed optimizations to be reported + /// that are normally too noisy. In this mode, we can use the extra analysis + /// (1) to filter trivial false positives or (2) to provide more context so + /// that non-trivial false positives can be quickly detected by the user. + bool allowExtraAnalysis() const { + // For now, only allow this with -fsave-optimization-record since the -Rpass + // options are handled in the front-end. + return MF.getFunction()->getContext().getDiagnosticsOutputFile(); + } + +private: + MachineFunction &MF; + + /// MBFI is only set if hotness is requested. + MachineBlockFrequencyInfo *MBFI; + + /// Compute hotness from IR value (currently assumed to be a block) if PGO is + /// available. + Optional computeHotness(const MachineBasicBlock *MBB); + + /// Similar but use value from \p OptDiag and update hotness there. + void computeHotness(DiagnosticInfoMIROptimization &Remark); + + /// \brief Only allow verbose messages if we know we're filtering by hotness + /// (BFI is only set in this case). + bool shouldEmitVerbose() { return MBFI != nullptr; } +}; + +/// The analysis pass +/// +/// Note that this pass shouldn't generally be marked as preserved by other +/// passes. It's holding onto BFI, so if the pass does not preserve BFI, BFI +/// could be freed. +class MachineOptimizationRemarkEmitterPass : public MachineFunctionPass { + std::unique_ptr ORE; + +public: + MachineOptimizationRemarkEmitterPass(); + + bool runOnMachineFunction(MachineFunction &MF) override; + + void getAnalysisUsage(AnalysisUsage &AU) const override; + + MachineOptimizationRemarkEmitter &getORE() { + assert(ORE && "pass not run yet"); + return *ORE; + } + + static char ID; +}; +} + +#endif Index: include/llvm/IR/DiagnosticInfo.h =================================================================== --- include/llvm/IR/DiagnosticInfo.h +++ include/llvm/IR/DiagnosticInfo.h @@ -69,6 +69,11 @@ DK_OptimizationFailure, DK_FirstRemark = DK_OptimizationRemark, DK_LastRemark = DK_OptimizationFailure, + DK_MachineOptimizationRemark, + DK_MachineOptimizationRemarkMissed, + DK_MachineOptimizationRemarkAnalysis, + DK_FirstMachineRemark = DK_MachineOptimizationRemark, + DK_LastMachineRemark = DK_MachineOptimizationRemarkAnalysis, DK_MIRParser, DK_PGOProfile, DK_Unsupported, @@ -440,8 +445,10 @@ bool isVerbose() const { return IsVerbose; } static bool classof(const DiagnosticInfo *DI) { - return DI->getKind() >= DK_FirstRemark && - DI->getKind() <= DK_LastRemark; + return (DI->getKind() >= DK_FirstRemark && + DI->getKind() <= DK_LastRemark) || + (DI->getKind() >= DK_FirstMachineRemark && + DI->getKind() <= DK_LastMachineRemark); } protected: @@ -529,6 +536,10 @@ Value *getCodeRegion() const { return CodeRegion; } + static bool classof(const DiagnosticInfo *DI) { + return DI->getKind() >= DK_FirstRemark && DI->getKind() <= DK_LastRemark; + } + private: /// The IR value (currently basic block) that the optimization operates on. /// This is currently used to provide run-time hotness information with PGO. @@ -569,8 +580,10 @@ return DI->getKind() == DK_OptimizationRemark; } + static bool isEnabled(StringRef PassName); + /// \see DiagnosticInfoOptimizationBase::isEnabled. - bool isEnabled() const override; + bool isEnabled() const override { return isEnabled(getPassName()); } }; /// Diagnostic information for missed-optimization remarks. @@ -607,8 +620,10 @@ return DI->getKind() == DK_OptimizationRemarkMissed; } + static bool isEnabled(StringRef PassName); + /// \see DiagnosticInfoOptimizationBase::isEnabled. - bool isEnabled() const override; + bool isEnabled() const override { return isEnabled(getPassName()); } }; /// Diagnostic information for optimization analysis remarks. @@ -656,8 +671,12 @@ return DI->getKind() == DK_OptimizationRemarkAnalysis; } + static bool isEnabled(StringRef PassName); + /// \see DiagnosticInfoOptimizationBase::isEnabled. - bool isEnabled() const override; + bool isEnabled() const override { + return shouldAlwaysPrint() || isEnabled(getPassName()); + } static const char *AlwaysPrint; Index: include/llvm/InitializePasses.h =================================================================== --- include/llvm/InitializePasses.h +++ include/llvm/InitializePasses.h @@ -231,6 +231,7 @@ void initializeMachineLICMPass(PassRegistry&); void initializeMachineLoopInfoPass(PassRegistry&); void initializeMachineModuleInfoPass(PassRegistry&); +void initializeMachineOptimizationRemarkEmitterPassPass(PassRegistry&); void initializeMachinePipelinerPass(PassRegistry&); void initializeMachinePostDominatorTreePass(PassRegistry&); void initializeMachineRegionInfoPassPass(PassRegistry&); Index: lib/Analysis/OptimizationDiagnosticInfo.cpp =================================================================== --- lib/Analysis/OptimizationDiagnosticInfo.cpp +++ lib/Analysis/OptimizationDiagnosticInfo.cpp @@ -67,44 +67,43 @@ namespace llvm { namespace yaml { -template <> struct MappingTraits { - static void mapping(IO &io, DiagnosticInfoOptimizationBase *&OptDiag) { - assert(io.outputting() && "input not yet implemented"); - - if (io.mapTag("!Passed", OptDiag->getKind() == DK_OptimizationRemark)) - ; - else if (io.mapTag("!Missed", - OptDiag->getKind() == DK_OptimizationRemarkMissed)) - ; - else if (io.mapTag("!Analysis", - OptDiag->getKind() == DK_OptimizationRemarkAnalysis)) - ; - else if (io.mapTag("!AnalysisFPCommute", - OptDiag->getKind() == - DK_OptimizationRemarkAnalysisFPCommute)) - ; - else if (io.mapTag("!AnalysisAliasing", - OptDiag->getKind() == - DK_OptimizationRemarkAnalysisAliasing)) - ; - else - llvm_unreachable("todo"); - - // These are read-only for now. - DebugLoc DL = OptDiag->getDebugLoc(); - StringRef FN = GlobalValue::getRealLinkageName( - OptDiag->getFunction().getName()); - - StringRef PassName(OptDiag->PassName); - io.mapRequired("Pass", PassName); - io.mapRequired("Name", OptDiag->RemarkName); - if (!io.outputting() || DL) - io.mapOptional("DebugLoc", DL); - io.mapRequired("Function", FN); - io.mapOptional("Hotness", OptDiag->Hotness); - io.mapOptional("Args", OptDiag->Args); - } -}; +void MappingTraits::mapping( + IO &io, DiagnosticInfoOptimizationBase *&OptDiag) { + assert(io.outputting() && "input not yet implemented"); + + if (io.mapTag("!Passed", OptDiag->getKind() == DK_OptimizationRemark)) + ; + else if (io.mapTag("!Missed", + OptDiag->getKind() == DK_OptimizationRemarkMissed)) + ; + else if (io.mapTag("!Analysis", + OptDiag->getKind() == DK_OptimizationRemarkAnalysis)) + ; + else if (io.mapTag("!AnalysisFPCommute", + OptDiag->getKind() == + DK_OptimizationRemarkAnalysisFPCommute)) + ; + else if (io.mapTag("!AnalysisAliasing", + OptDiag->getKind() == + DK_OptimizationRemarkAnalysisAliasing)) + ; + else + llvm_unreachable("todo"); + + // These are read-only for now. + DebugLoc DL = OptDiag->getDebugLoc(); + StringRef FN = + GlobalValue::getRealLinkageName(OptDiag->getFunction().getName()); + + StringRef PassName(OptDiag->PassName); + io.mapRequired("Pass", PassName); + io.mapRequired("Name", OptDiag->RemarkName); + if (!io.outputting() || DL) + io.mapOptional("DebugLoc", DL); + io.mapRequired("Function", FN); + io.mapOptional("Hotness", OptDiag->Hotness); + io.mapOptional("Args", OptDiag->Args); +} template <> struct MappingTraits { static void mapping(IO &io, DebugLoc &DL) { Index: lib/CodeGen/CMakeLists.txt =================================================================== --- lib/CodeGen/CMakeLists.txt +++ lib/CodeGen/CMakeLists.txt @@ -71,6 +71,7 @@ MachineLoopInfo.cpp MachineModuleInfo.cpp MachineModuleInfoImpls.cpp + MachineOptimizationRemarkEmitter.cpp MachinePassRegistry.cpp MachinePipeliner.cpp MachinePostDominators.cpp Index: lib/CodeGen/MachineLoopInfo.cpp =================================================================== --- lib/CodeGen/MachineLoopInfo.cpp +++ lib/CodeGen/MachineLoopInfo.cpp @@ -87,6 +87,22 @@ return nullptr; } +DebugLoc MachineLoop::getStartLoc() const { + // Try the pre-header first. + if (MachineBasicBlock *PHeadMBB = getLoopPreheader()) + if (const BasicBlock *PHeadBB = PHeadMBB->getBasicBlock()) + if (DebugLoc DL = PHeadBB->getTerminator()->getDebugLoc()) + return DL; + + // If we have no pre-header or there are no instructions with debug + // info in it, try the header. + if (MachineBasicBlock *HeadMBB = getHeader()) + if (const BasicBlock *HeadBB = HeadMBB->getBasicBlock()) + return HeadBB->getTerminator()->getDebugLoc(); + + return DebugLoc(); +} + MachineBasicBlock * MachineLoopInfo::findLoopPreheader(MachineLoop *L, bool SpeculativePreheader) const { Index: lib/CodeGen/MachineOptimizationRemarkEmitter.cpp =================================================================== --- /dev/null +++ lib/CodeGen/MachineOptimizationRemarkEmitter.cpp @@ -0,0 +1,90 @@ +//===- MachineOptimizationRemarkEmitter.cpp - Opt Diagnostic -*- C++ -*----===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// \file +// Optimization diagnostic interfaces for machine passes. It's packaged as an +// analysis pass so that by using this service passes become dependent on MBFI +// as well. MBFI is used to compute the "hotness" of the diagnostic message. +// +//===----------------------------------------------------------------------===// + +#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h" +#include "llvm/CodeGen/MachineBlockFrequencyInfo.h" +#include "llvm/IR/DebugInfo.h" +#include "llvm/IR/DiagnosticInfo.h" +#include "llvm/IR/LLVMContext.h" + +using namespace llvm; + +Optional +MachineOptimizationRemarkEmitter::computeHotness(const MachineBasicBlock *MBB) { + if (!MBFI) + return None; + + return MBFI->getBlockProfileCount(MBB); +} + +void MachineOptimizationRemarkEmitter::computeHotness( + DiagnosticInfoMIROptimization &Remark) { + const MachineBasicBlock *MBB = Remark.getBlock(); + if (MBB) + Remark.setHotness(computeHotness(MBB)); +} + +void MachineOptimizationRemarkEmitter::emit( + DiagnosticInfoOptimizationBase &OptDiagCommon) { + auto &OptDiag = cast(OptDiagCommon); + computeHotness(OptDiag); + + LLVMContext &Ctx = MF.getFunction()->getContext(); + yaml::Output *Out = Ctx.getDiagnosticsOutputFile(); + if (Out) { + auto *P = &const_cast(OptDiagCommon); + *Out << P; + } + // FIXME: now that IsVerbose is part of DI, filtering for this will be moved + // from here to clang. + if (!OptDiag.isVerbose() || shouldEmitVerbose()) + Ctx.diagnose(OptDiag); +} + +MachineOptimizationRemarkEmitterPass::MachineOptimizationRemarkEmitterPass() + : MachineFunctionPass(ID) { + initializeMachineOptimizationRemarkEmitterPassPass( + *PassRegistry::getPassRegistry()); +} + +bool MachineOptimizationRemarkEmitterPass::runOnMachineFunction( + MachineFunction &MF) { + MachineBlockFrequencyInfo *MBFI; + + if (MF.getFunction()->getContext().getDiagnosticHotnessRequested()) + MBFI = &getAnalysis(); + else + MBFI = nullptr; + + ORE = llvm::make_unique(MF, MBFI); + return false; +} + +void MachineOptimizationRemarkEmitterPass::getAnalysisUsage( + AnalysisUsage &AU) const { + AU.addRequired(); + AU.setPreservesAll(); + MachineFunctionPass::getAnalysisUsage(AU); +} + +char MachineOptimizationRemarkEmitterPass::ID = 0; +static const char ore_name[] = "Machine Optimization Remark Emitter"; +#define ORE_NAME "machine-opt-remark-emitter" + +INITIALIZE_PASS_BEGIN(MachineOptimizationRemarkEmitterPass, ORE_NAME, ore_name, + false, true) +INITIALIZE_PASS_DEPENDENCY(MachineBlockFrequencyInfo) +INITIALIZE_PASS_END(MachineOptimizationRemarkEmitterPass, ORE_NAME, ore_name, + false, true) Index: lib/CodeGen/RegAllocGreedy.cpp =================================================================== --- lib/CodeGen/RegAllocGreedy.cpp +++ lib/CodeGen/RegAllocGreedy.cpp @@ -29,8 +29,10 @@ #include "llvm/CodeGen/LiveStackAnalysis.h" #include "llvm/CodeGen/MachineBlockFrequencyInfo.h" #include "llvm/CodeGen/MachineDominators.h" +#include "llvm/CodeGen/MachineFrameInfo.h" #include "llvm/CodeGen/MachineFunctionPass.h" #include "llvm/CodeGen/MachineLoopInfo.h" +#include "llvm/CodeGen/MachineOptimizationRemarkEmitter.h" #include "llvm/CodeGen/MachineRegisterInfo.h" #include "llvm/CodeGen/Passes.h" #include "llvm/CodeGen/RegAllocRegistry.h" @@ -125,6 +127,7 @@ MachineBlockFrequencyInfo *MBFI; MachineDominatorTree *DomTree; MachineLoopInfo *Loops; + MachineOptimizationRemarkEmitter *ORE; EdgeBundles *Bundles; SpillPlacement *SpillPlacer; LiveDebugVariables *DebugVars; @@ -419,6 +422,23 @@ void collectHintInfo(unsigned, HintsInfo &); bool isUnusedCalleeSavedReg(unsigned PhysReg) const; + + /// Compute and report the number of spills and reloads for a loop. + void reportNumberOfSplillsReloads(MachineLoop *L, unsigned &Reloads, + unsigned &FoldedReloads, unsigned &Spills, + unsigned &FoldedSpills); + + /// Report the number of spills and reloads for each loop. + void reportNumberOfSplillsReloads() { + unsigned Reloads = 0; + unsigned FoldedReloads = 0; + unsigned Spills = 0; + unsigned FoldedSpills = 0; + + for (MachineLoop *L : *Loops) + reportNumberOfSplillsReloads(L, Reloads, FoldedReloads, Spills, + FoldedSpills); + } }; } // end anonymous namespace @@ -439,6 +459,7 @@ INITIALIZE_PASS_DEPENDENCY(LiveRegMatrix) INITIALIZE_PASS_DEPENDENCY(EdgeBundles) INITIALIZE_PASS_DEPENDENCY(SpillPlacement) +INITIALIZE_PASS_DEPENDENCY(MachineOptimizationRemarkEmitterPass) INITIALIZE_PASS_END(RAGreedy, "greedy", "Greedy Register Allocator", false, false) @@ -490,6 +511,7 @@ AU.addPreserved(); AU.addRequired(); AU.addRequired(); + AU.addRequired(); MachineFunctionPass::getAnalysisUsage(AU); } @@ -2611,6 +2633,54 @@ return 0; } +void RAGreedy::reportNumberOfSplillsReloads(MachineLoop *L, unsigned &Reloads, + unsigned &FoldedReloads, + unsigned &Spills, + unsigned &FoldedSpills) { + // Sum up the spill and reloads in subloops. + for (MachineLoop *SubLoop : *L) + reportNumberOfSplillsReloads(SubLoop, Reloads, FoldedReloads, Spills, + FoldedSpills); + + const MachineFrameInfo &MFI = MF->getFrameInfo(); + const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo(); + int FI; + + for (MachineBasicBlock *MBB : L->getBlocks()) + // Handle blocks that were not included in subloops. + if (Loops->getLoopFor(MBB) == L) + for (MachineInstr &MI : *MBB) { + const MachineMemOperand *MMO; + + if (TII->isLoadFromStackSlot(MI, FI) && MFI.isSpillSlotObjectIndex(FI)) + ++Reloads; + else if (TII->hasLoadFromStackSlot(MI, MMO, FI) && + MFI.isSpillSlotObjectIndex(FI)) + ++FoldedReloads; + else if (TII->isStoreToStackSlot(MI, FI) && + MFI.isSpillSlotObjectIndex(FI)) + ++Spills; + else if (TII->hasStoreToStackSlot(MI, MMO, FI) && + MFI.isSpillSlotObjectIndex(FI)) + ++FoldedSpills; + } + + if (Reloads || FoldedReloads || Spills || FoldedSpills) { + using namespace ore; + MachineOptimizationRemarkMissed R(DEBUG_TYPE, "LoopSpillReload", + L->getStartLoc(), L->getHeader()); + if (Spills) + R << NV("NumSpills", Spills) << " spills "; + if (FoldedSpills) + R << NV("NumFoldedSpills", FoldedSpills) << " folded spills "; + if (Reloads) + R << NV("NumReloads", Reloads) << " reloads "; + if (FoldedReloads) + R << NV("NumFoldedReloads", FoldedReloads) << " folded reloads "; + ORE->emit(R << "generated in loop"); + } +} + bool RAGreedy::runOnMachineFunction(MachineFunction &mf) { DEBUG(dbgs() << "********** GREEDY REGISTER ALLOCATION **********\n" << "********** Function: " << mf.getName() << '\n'); @@ -2633,6 +2703,7 @@ Indexes = &getAnalysis(); MBFI = &getAnalysis(); DomTree = &getAnalysis(); + ORE = &getAnalysis().getORE(); SpillerInstance.reset(createInlineSpiller(*this, *MF, *VRM)); Loops = &getAnalysis(); Bundles = &getAnalysis(); @@ -2658,6 +2729,7 @@ allocatePhysRegs(); tryHintsRecoloring(); postOptimization(); + reportNumberOfSplillsReloads(); releaseMemory(); return true; Index: lib/IR/DiagnosticInfo.cpp =================================================================== --- lib/IR/DiagnosticInfo.cpp +++ lib/IR/DiagnosticInfo.cpp @@ -222,9 +222,9 @@ RemarkName, *Inst->getParent()->getParent(), Inst->getDebugLoc(), Inst->getParent()) {} -bool OptimizationRemark::isEnabled() const { +bool OptimizationRemark::isEnabled(StringRef PassName) { return PassRemarksOptLoc.Pattern && - PassRemarksOptLoc.Pattern->match(getPassName()); + PassRemarksOptLoc.Pattern->match(PassName); } OptimizationRemarkMissed::OptimizationRemarkMissed(const char *PassName, @@ -243,9 +243,9 @@ *Inst->getParent()->getParent(), Inst->getDebugLoc(), Inst->getParent()) {} -bool OptimizationRemarkMissed::isEnabled() const { +bool OptimizationRemarkMissed::isEnabled(StringRef PassName) { return PassRemarksMissedOptLoc.Pattern && - PassRemarksMissedOptLoc.Pattern->match(getPassName()); + PassRemarksMissedOptLoc.Pattern->match(PassName); } OptimizationRemarkAnalysis::OptimizationRemarkAnalysis(const char *PassName, @@ -273,10 +273,9 @@ *cast(CodeRegion)->getParent(), DLoc, CodeRegion) {} -bool OptimizationRemarkAnalysis::isEnabled() const { - return shouldAlwaysPrint() || - (PassRemarksAnalysisOptLoc.Pattern && - PassRemarksAnalysisOptLoc.Pattern->match(getPassName())); +bool OptimizationRemarkAnalysis::isEnabled(StringRef PassName) { + return PassRemarksAnalysisOptLoc.Pattern && + PassRemarksAnalysisOptLoc.Pattern->match(PassName); } void DiagnosticInfoMIRParser::print(DiagnosticPrinter &DP) const { Index: test/CodeGen/AArch64/arm64-spill-remarks.ll =================================================================== --- /dev/null +++ test/CodeGen/AArch64/arm64-spill-remarks.ll @@ -0,0 +1,50 @@ +; RUN: llc < %s -mtriple=arm64-apple-ios7.0 -aarch64-neon-syntax=apple -pass-remarks-missed=regalloc 2>&1 | FileCheck -check-prefix=REMARK %s +; RUN: llc < %s -mtriple=arm64-apple-ios7.0 -aarch64-neon-syntax=apple 2>&1 | FileCheck -check-prefix=NO_REMARK %s + +; This has two nested loops, each with one value that has to be spilled and +; then reloaded. + +; REMARK: remark: /tmp/kk.c:3:20: 1 spills 1 reloads generated in loop +; REMARK: remark: /tmp/kk.c:2:20: 2 spills 2 reloads generated in loop + +; NO_REMARK-NOT: remark + +define void @fpr128(<4 x float>* %p) nounwind ssp { +entry: + br label %loop, !dbg !8 + +loop: + %i = phi i32 [ 0, %entry], [ %i.2, %end2 ] + br label %loop2, !dbg !9 + +loop2: + %j = phi i32 [ 0, %loop], [ %j.2, %loop2 ] + call void asm sideeffect "; inlineasm", "~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{q16},~{q17},~{q18},~{q19},~{q20},~{q21},~{q22},~{q23},~{q24},~{q25},~{q26},~{q27},~{q28},~{q29},~{q30},~{q31},~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{sp},~{memory}"() nounwind + %j.2 = add i32 %j, 1 + %c2 = icmp slt i32 %j.2, 100 + br i1 %c2, label %loop2, label %end2 + +end2: + call void asm sideeffect "; inlineasm", "~{q0},~{q1},~{q2},~{q3},~{q4},~{q5},~{q6},~{q7},~{q8},~{q9},~{q10},~{q11},~{q12},~{q13},~{q14},~{q15},~{q16},~{q17},~{q18},~{q19},~{q20},~{q21},~{q22},~{q23},~{q24},~{q25},~{q26},~{q27},~{q28},~{q29},~{q30},~{q31},~{x0},~{x1},~{x2},~{x3},~{x4},~{x5},~{x6},~{x7},~{x8},~{x9},~{x10},~{x11},~{x12},~{x13},~{x14},~{x15},~{x16},~{x17},~{x18},~{x19},~{x20},~{x21},~{x22},~{x23},~{x24},~{x25},~{x26},~{x27},~{x28},~{fp},~{lr},~{sp},~{memory}"() nounwind + %i.2 = add i32 %i, 1 + %c = icmp slt i32 %i.2, 100 + br i1 %c, label %loop, label %end + +end: + ret void +} + +!llvm.dbg.cu = !{!0} +!llvm.module.flags = !{!3, !4} +!llvm.ident = !{!5} + +!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: NoDebug, enums: !2) +!1 = !DIFile(filename: "/tmp/kk.c", directory: "/tmp") +!2 = !{} +!3 = !{i32 2, !"Debug Info Version", i32 3} +!4 = !{i32 1, !"PIC Level", i32 2} +!5 = !{!"clang version 3.9.0 "} +!6 = distinct !DISubprogram(name: "success", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2) +!7 = !DISubroutineType(types: !2) +!8 = !DILocation(line: 2, column: 20, scope: !6) +!9 = !DILocation(line: 3, column: 20, scope: !6) Index: tools/llc/llc.cpp =================================================================== --- tools/llc/llc.cpp +++ tools/llc/llc.cpp @@ -233,6 +233,10 @@ if (DI.getSeverity() == DS_Error) *HasError = true; + if (auto *Remark = dyn_cast(&DI)) + if (!Remark->isEnabled()) + return; + DiagnosticPrinterRawOStream DP(errs()); errs() << LLVMContext::getDiagnosticMessagePrefix(DI.getSeverity()) << ": "; DI.print(DP);