llvm-project/llvm/lib/CodeGen
Matthias Braun 3ab9fcb98e Split TailDuplicatePass into pre- and post-RA variant; NFC
Split TailDuplicatePass into EarlyTailDuplicate and TailDuplicate. This
avoids playing games with fake pass IDs and using MRI::isSSA() to
determine pre-/post-RA state.

llvm-svn: 322926
2018-01-19 06:08:17 +00:00
..
AsmPrinter [CodeGen] Hoist common AsmPrinter code out of X86, ARM, and AArch64 2018-01-17 23:55:23 +00:00
GlobalISel [GISel] Make constrainSelectedInstRegOperands() available to the legalizer. NFC 2018-01-17 19:31:33 +00:00
MIRParser AArch64: Fix emergency spillslot being out of reach for large callframes 2018-01-19 03:16:36 +00:00
SelectionDAG [TargetLowering] add punctuation for readability; NFC 2018-01-18 15:25:32 +00:00
AggressiveAntiDepBreaker.cpp [CodeGen] Don't print "pred:" and "opt:" in -debug output 2018-01-09 17:31:07 +00:00
AggressiveAntiDepBreaker.h Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
AllocationOrder.cpp [CodeGen] Rename functions PrintReg* to printReg* 2017-11-28 12:42:37 +00:00
AllocationOrder.h [RegAlloc, SystemZ] Increase number of LOCRs by passing "hard" regalloc hints. 2017-11-10 08:46:26 +00:00
Analysis.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
AntiDepBreaker.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-09-29 21:55:49 +00:00
AtomicExpandPass.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
BasicTargetTransformInfo.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
BranchFolding.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
BranchFolding.h [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-10-10 22:33:29 +00:00
BranchRelaxation.cpp Changes in the branch relaxation algorithm. 2018-01-04 07:08:45 +00:00
BuiltinGCs.cpp Sort the remaining #include lines in include/... and lib/.... 2017-06-06 11:49:48 +00:00
CMakeLists.txt LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
CalcSpillWeights.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
CallingConvLower.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
CodeGen.cpp Split TailDuplicatePass into pre- and post-RA variant; NFC 2018-01-19 06:08:17 +00:00
CodeGenPrepare.cpp Revert [CGP] Re-enable Select in complex addressing mode 2018-01-19 04:52:39 +00:00
CriticalAntiDepBreaker.cpp [CodeGen] Don't print "pred:" and "opt:" in -debug output 2018-01-09 17:31:07 +00:00
CriticalAntiDepBreaker.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-09-29 21:55:49 +00:00
DFAPacketizer.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
DeadMachineInstructionElim.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
DetectDeadLanes.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
DwarfEHPrepare.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
EarlyIfConversion.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
EdgeBundles.cpp [CodeGen] Unify MBB reference format in both MIR and debug output 2017-12-04 17:18:51 +00:00
ExecutionDepsFix.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
ExpandISelPseudos.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
ExpandMemCmp.cpp [x86, MemCmpExpansion] allow 2 pairs of loads per block (PR33325) 2018-01-06 16:16:04 +00:00
ExpandPostRAPseudos.cpp [CodeGen] Use MachineOperand::print in the MIRPrinter for MO_Register. 2017-12-07 10:40:31 +00:00
ExpandReductions.cpp [IR] redefine 'UnsafeAlgebra' / 'reassoc' fast-math-flags and add 'trans' fast-math-flag 2017-11-06 16:27:15 +00:00
FEntryInserter.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
FaultMaps.cpp Sort the remaining #include lines in include/... and lib/.... 2017-06-06 11:49:48 +00:00
FuncletLayout.cpp Sort the remaining #include lines in include/... and lib/.... 2017-06-06 11:49:48 +00:00
GCMetadata.cpp [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-06-07 23:53:32 +00:00
GCMetadataPrinter.cpp [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-06-07 23:53:32 +00:00
GCRootLowering.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
GCStrategy.cpp
GlobalMerge.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
IfConversion.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
ImplicitNullChecks.cpp [NFC] fix trivial typos in comments 2018-01-17 12:29:38 +00:00
InlineSpiller.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
InterferenceCache.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
InterferenceCache.h [CodeGen] Fix build bots which uses old Clang broken in r314046. (NFC) 2017-09-22 23:55:32 +00:00
InterleavedAccessPass.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
IntrinsicLowering.cpp [CodeGen] fix documentation comments; NFC 2017-12-15 18:34:45 +00:00
LLVMBuild.txt LLVMCodeGen: Add ProfileData into deps corresponding to r300277. 2017-04-14 00:36:06 +00:00
LLVMTargetMachine.cpp Thread MCSubtargetInfo through Target::createMCAsmBackend 2018-01-03 08:53:05 +00:00
LatencyPriorityQueue.cpp Assert correct removal of SUnit in LatencyPriorityQueue 2017-11-16 10:18:07 +00:00
LazyMachineBlockFrequencyInfo.cpp
LexicalScopes.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
LiveDebugValues.cpp [LiveDebugValues] recognize spilled reg killed in instruction after spill 2018-01-16 14:46:05 +00:00
LiveDebugVariables.cpp [MachineOperand] Fix LiveDebugVariables code after isRenamable change. 2017-12-29 21:01:09 +00:00
LiveDebugVariables.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-08-24 21:21:39 +00:00
LiveInterval.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
LiveIntervalUnion.cpp [CodeGen] Rename functions PrintReg* to printReg* 2017-11-28 12:42:37 +00:00
LiveIntervals.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
LivePhysRegs.cpp [CodeGen] Rename functions PrintReg* to printReg* 2017-11-28 12:42:37 +00:00
LiveRangeCalc.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
LiveRangeCalc.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-08-24 21:21:39 +00:00
LiveRangeEdit.cpp LiveRangeEdit: Inline markDeadRemat() into only user; NFC 2018-01-10 22:36:26 +00:00
LiveRangeShrink.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
LiveRangeUtils.h
LiveRegMatrix.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
LiveRegUnits.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
LiveStacks.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
LiveVariables.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
LocalStackSlotAllocation.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
LowLevelType.cpp [GlobalISel] Support vector-of-pointers in LLT 2017-04-19 07:23:57 +00:00
LowerEmuTLS.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
MIRCanonicalizerPass.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
MIRPrinter.cpp [CodeGen][NFC] Rename IsVerbose to IsStandalone in Machine*::print 2018-01-18 18:05:15 +00:00
MIRPrintingPass.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
MachineBasicBlock.cpp [CodeGen][NFC] Rename IsVerbose to IsStandalone in Machine*::print 2018-01-18 18:05:15 +00:00
MachineBlockFrequencyInfo.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
MachineBlockPlacement.cpp Add hasProfileData() to check if a function has profile data. NFC. 2017-12-22 01:33:52 +00:00
MachineBranchProbabilityInfo.cpp [CodeGen] Unify MBB reference format in both MIR and debug output 2017-12-04 17:18:51 +00:00
MachineCSE.cpp GlobalISel: Make MachineCSE runnable in the middle of the GlobalISel 2018-01-18 02:06:56 +00:00
MachineCombiner.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
MachineCopyPropagation.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
MachineDominanceFrontier.cpp [Dominators] Make IsPostDominator a template parameter 2017-07-14 18:26:09 +00:00
MachineDominators.cpp [[Machine]Dominators] Improved printout when verifyDomTree fails [NFC] 2017-12-06 09:27:48 +00:00
MachineFrameInfo.cpp MachineFrameInfo: Cleanup some parameter naming inconsistencies; NFC 2017-12-05 01:18:15 +00:00
MachineFunction.cpp [CodeGen][NFC] Rename IsVerbose to IsStandalone in Machine*::print 2018-01-18 18:05:15 +00:00
MachineFunctionPass.cpp CodeGen: Refactor MIR parsing 2017-06-06 00:44:35 +00:00
MachineFunctionPrinterPass.cpp Sort the remaining #include lines in include/... and lib/.... 2017-06-06 11:49:48 +00:00
MachineInstr.cpp [CodeGen][NFC] Rename IsVerbose to IsStandalone in Machine*::print 2018-01-18 18:05:15 +00:00
MachineInstrBundle.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
MachineLICM.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
MachineLoopInfo.cpp Reverting r315590; it did not include changes for llvm-tblgen, which is causing link errors for several people. 2017-10-15 14:32:27 +00:00
MachineModuleInfo.cpp MachineFunction: Slight refactoring; NFC 2017-12-15 22:22:46 +00:00
MachineModuleInfoImpls.cpp [MachineModuleInfoImpls] Replace qsort with array_pod_sort 2017-10-26 16:07:20 +00:00
MachineOperand.cpp [CodeGen][NFC] Rename IsVerbose to IsStandalone in Machine*::print 2018-01-18 18:05:15 +00:00
MachineOptimizationRemarkEmitter.cpp [CodeGen][NFC] Rename IsVerbose to IsStandalone in Machine*::print 2018-01-18 18:05:15 +00:00
MachineOutliner.cpp [MachineOutliner] Add DISubprograms to outlined functions. 2018-01-18 00:00:58 +00:00
MachinePassRegistry.cpp
MachinePipeliner.cpp [NFC] fix trivial typos in comments 2018-01-17 12:29:38 +00:00
MachinePostDominators.cpp [Dominators] Make IsPostDominator a template parameter 2017-07-14 18:26:09 +00:00
MachineRegionInfo.cpp Reverting r315590; it did not include changes for llvm-tblgen, which is causing link errors for several people. 2017-10-15 14:32:27 +00:00
MachineRegisterInfo.cpp GlobalISel: Make MachineCSE runnable in the middle of the GlobalISel 2018-01-18 02:06:56 +00:00
MachineSSAUpdater.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
MachineScheduler.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
MachineSink.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
MachineTraceMetrics.cpp [CodeGen] Unify MBB reference format in both MIR and debug output 2017-12-04 17:18:51 +00:00
MachineVerifier.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
MacroFusion.cpp [CodeGen] Improve the consistency of instruction fusion* 2017-12-11 21:09:27 +00:00
OptimizePHIs.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
PHIElimination.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
PHIEliminationUtils.cpp
PHIEliminationUtils.h
ParallelCG.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
PatchableFunction.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
PeepholeOptimizer.cpp PeepholeOpt cleanup/refactor; NFC 2018-01-11 22:59:33 +00:00
PostRAHazardRecognizer.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
PostRASchedulerList.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
PreISelIntrinsicLowering.cpp [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-09-13 21:15:20 +00:00
ProcessImplicitDefs.cpp [CodeGen] Unify MBB reference format in both MIR and debug output 2017-12-04 17:18:51 +00:00
PrologEpilogInserter.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
PseudoSourceValue.cpp Target/TargetInstrInfo.h -> CodeGen/TargetInstrInfo.h to match layering 2017-11-08 01:01:31 +00:00
README.txt LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
RegAllocBase.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
RegAllocBase.h [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-09-13 21:15:20 +00:00
RegAllocBasic.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
RegAllocFast.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
RegAllocGreedy.cpp [NFC] fix trivial typos in comments 2018-01-17 12:29:38 +00:00
RegAllocPBQP.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
RegUsageInfoCollector.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
RegUsageInfoPropagate.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
RegisterClassInfo.cpp [CodeGen] Rename functions PrintReg* to printReg* 2017-11-28 12:42:37 +00:00
RegisterCoalescer.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
RegisterCoalescer.h [CodeGen] Fix some Clang-tidy modernize-use-default-member-init and Include What You Use warnings; other minor fixes (NFC). 2017-09-22 23:46:57 +00:00
RegisterPressure.cpp [NFC] fix trivial typos in comments 2018-01-17 12:29:38 +00:00
RegisterScavenging.cpp [CodeGen] Use MachineOperand::print in the MIRPrinter for MO_Register. 2017-12-07 10:40:31 +00:00
RegisterUsageInfo.cpp [CodeGen] Always use `printReg` to print registers in both MIR and debug 2017-11-30 16:12:24 +00:00
RenameIndependentSubregs.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
ResetMachineFunctionPass.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
SafeStack.cpp Generalize llvm::replaceDbgDeclare and actually support the use-case that 2017-12-08 21:58:18 +00:00
SafeStackColoring.cpp Reverting r315590; it did not include changes for llvm-tblgen, which is causing link errors for several people. 2017-10-15 14:32:27 +00:00
SafeStackColoring.h [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-10-10 22:33:29 +00:00
SafeStackLayout.cpp [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-10-10 22:33:29 +00:00
SafeStackLayout.h [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-10-10 22:33:29 +00:00
ScalarizeMaskedMemIntrin.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
ScheduleDAG.cpp [CodeGen] Rename functions PrintReg* to printReg* 2017-11-28 12:42:37 +00:00
ScheduleDAGInstrs.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
ScheduleDAGPrinter.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
ScoreboardHazardRecognizer.cpp Target/TargetInstrInfo.h -> CodeGen/TargetInstrInfo.h to match layering 2017-11-08 01:01:31 +00:00
ShadowStackGCLowering.cpp [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 2017-09-13 21:15:20 +00:00
ShrinkWrap.cpp [CodeGen] Skip some instructions that shouldn't affect shrink-wrapping 2018-01-16 18:55:26 +00:00
SjLjEHPrepare.cpp [SjLj] Replace recursive block marking algorithm with iterative algorithm 2017-07-12 23:05:15 +00:00
SlotIndexes.cpp Remove redundant includes from lib/CodeGen. 2017-12-13 21:30:47 +00:00
SpillPlacement.cpp [CodeGen] Fix some Clang-tidy modernize-use-bool-literals and Include What You Use warnings; other minor fixes (NFC). 2017-09-21 23:20:16 +00:00
SpillPlacement.h [CodeGen] Fix some Clang-tidy modernize-use-bool-literals and Include What You Use warnings; other minor fixes (NFC). 2017-09-21 23:20:16 +00:00
Spiller.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-08-29 22:32:07 +00:00
SplitKit.cpp Rename LiveIntervalAnalysis.h to LiveIntervals.h 2017-12-13 02:51:04 +00:00
SplitKit.h [CodeGen] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC). 2017-08-29 22:32:07 +00:00
StackColoring.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
StackMapLivenessAnalysis.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
StackMaps.cpp Mark all library options as hidden. 2017-12-01 00:53:10 +00:00
StackProtector.cpp Re-commit r319490 "XOR the frame pointer with the stack cookie when protecting the stack" 2017-12-05 20:22:20 +00:00
StackSlotColoring.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
TailDuplication.cpp Split TailDuplicatePass into pre- and post-RA variant; NFC 2018-01-19 06:08:17 +00:00
TailDuplicator.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
TargetFrameLoweringImpl.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
TargetInstrInfo.cpp PeepholeOptimizer: Fix for vregs without defs 2018-01-11 22:30:43 +00:00
TargetLoweringBase.cpp Add support for emitting libcalls for x86_fp80 -> fp128 and vice-versa 2018-01-17 22:29:16 +00:00
TargetLoweringObjectFileImpl.cpp [WebAssembly] Add COMDAT support 2018-01-09 23:43:14 +00:00
TargetOptionsImpl.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
TargetPassConfig.cpp Split TailDuplicatePass into pre- and post-RA variant; NFC 2018-01-19 06:08:17 +00:00
TargetRegisterInfo.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
TargetSchedule.cpp Fix a bunch more layering of CodeGen headers that are in Target 2017-11-17 01:07:10 +00:00
TargetSubtargetInfo.cpp AArch64: Fix emergency spillslot being out of reach for large callframes 2018-01-19 03:16:36 +00:00
TwoAddressInstructionPass.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00
UnreachableBlockElim.cpp Target/TargetInstrInfo.h -> CodeGen/TargetInstrInfo.h to match layering 2017-11-08 01:01:31 +00:00
VirtRegMap.cpp LiveStacks: Rename LiveStack.{h|cpp} to LiveStacks.{h|cpp}; NFC 2017-12-18 23:19:44 +00:00
WinEHPrepare.cpp Use phi ranges to simplify code. No functionality change intended. 2017-12-30 15:27:33 +00:00
XRayInstrumentation.cpp MachineFunction: Return reference from getFunction(); NFC 2017-12-15 22:22:58 +00:00

README.txt

//===---------------------------------------------------------------------===//

Common register allocation / spilling problem:

        mul lr, r4, lr
        str lr, [sp, #+52]
        ldr lr, [r1, #+32]
        sxth r3, r3
        ldr r4, [sp, #+52]
        mla r4, r3, lr, r4

can be:

        mul lr, r4, lr
        mov r4, lr
        str lr, [sp, #+52]
        ldr lr, [r1, #+32]
        sxth r3, r3
        mla r4, r3, lr, r4

and then "merge" mul and mov:

        mul r4, r4, lr
        str r4, [sp, #+52]
        ldr lr, [r1, #+32]
        sxth r3, r3
        mla r4, r3, lr, r4

It also increase the likelihood the store may become dead.

//===---------------------------------------------------------------------===//

bb27 ...
        ...
        %reg1037 = ADDri %reg1039, 1
        %reg1038 = ADDrs %reg1032, %reg1039, %noreg, 10
    Successors according to CFG: 0x8b03bf0 (#5)

bb76 (0x8b03bf0, LLVM BB @0x8b032d0, ID#5):
    Predecessors according to CFG: 0x8b0c5f0 (#3) 0x8b0a7c0 (#4)
        %reg1039 = PHI %reg1070, mbb<bb76.outer,0x8b0c5f0>, %reg1037, mbb<bb27,0x8b0a7c0>

Note ADDri is not a two-address instruction. However, its result %reg1037 is an
operand of the PHI node in bb76 and its operand %reg1039 is the result of the
PHI node. We should treat it as a two-address code and make sure the ADDri is
scheduled after any node that reads %reg1039.

//===---------------------------------------------------------------------===//

Use local info (i.e. register scavenger) to assign it a free register to allow
reuse:
        ldr r3, [sp, #+4]
        add r3, r3, #3
        ldr r2, [sp, #+8]
        add r2, r2, #2
        ldr r1, [sp, #+4]  <==
        add r1, r1, #1
        ldr r0, [sp, #+4]
        add r0, r0, #2

//===---------------------------------------------------------------------===//

LLVM aggressively lift CSE out of loop. Sometimes this can be negative side-
effects:

R1 = X + 4
R2 = X + 7
R3 = X + 15

loop:
load [i + R1]
...
load [i + R2]
...
load [i + R3]

Suppose there is high register pressure, R1, R2, R3, can be spilled. We need
to implement proper re-materialization to handle this:

R1 = X + 4
R2 = X + 7
R3 = X + 15

loop:
R1 = X + 4  @ re-materialized
load [i + R1]
...
R2 = X + 7 @ re-materialized
load [i + R2]
...
R3 = X + 15 @ re-materialized
load [i + R3]

Furthermore, with re-association, we can enable sharing:

R1 = X + 4
R2 = X + 7
R3 = X + 15

loop:
T = i + X
load [T + 4]
...
load [T + 7]
...
load [T + 15]
//===---------------------------------------------------------------------===//

It's not always a good idea to choose rematerialization over spilling. If all
the load / store instructions would be folded then spilling is cheaper because
it won't require new live intervals / registers. See 2003-05-31-LongShifts for
an example.

//===---------------------------------------------------------------------===//

With a copying garbage collector, derived pointers must not be retained across
collector safe points; the collector could move the objects and invalidate the
derived pointer. This is bad enough in the first place, but safe points can
crop up unpredictably. Consider:

        %array = load { i32, [0 x %obj] }** %array_addr
        %nth_el = getelementptr { i32, [0 x %obj] }* %array, i32 0, i32 %n
        %old = load %obj** %nth_el
        %z = div i64 %x, %y
        store %obj* %new, %obj** %nth_el

If the i64 division is lowered to a libcall, then a safe point will (must)
appear for the call site. If a collection occurs, %array and %nth_el no longer
point into the correct object.

The fix for this is to copy address calculations so that dependent pointers
are never live across safe point boundaries. But the loads cannot be copied
like this if there was an intervening store, so may be hard to get right.

Only a concurrent mutator can trigger a collection at the libcall safe point.
So single-threaded programs do not have this requirement, even with a copying
collector. Still, LLVM optimizations would probably undo a front-end's careful
work.

//===---------------------------------------------------------------------===//

The ocaml frametable structure supports liveness information. It would be good
to support it.

//===---------------------------------------------------------------------===//

The FIXME in ComputeCommonTailLength in BranchFolding.cpp needs to be
revisited. The check is there to work around a misuse of directives in inline
assembly.

//===---------------------------------------------------------------------===//

It would be good to detect collector/target compatibility instead of silently
doing the wrong thing.

//===---------------------------------------------------------------------===//

It would be really nice to be able to write patterns in .td files for copies,
which would eliminate a bunch of explicit predicates on them (e.g. no side 
effects).  Once this is in place, it would be even better to have tblgen 
synthesize the various copy insertion/inspection methods in TargetInstrInfo.

//===---------------------------------------------------------------------===//

Stack coloring improvements:

1. Do proper LiveStacks analysis on all stack objects including those which are
   not spill slots.
2. Reorder objects to fill in gaps between objects.
   e.g. 4, 1, <gap>, 4, 1, 1, 1, <gap>, 4 => 4, 1, 1, 1, 1, 4, 4

//===---------------------------------------------------------------------===//

The scheduler should be able to sort nearby instructions by their address. For
example, in an expanded memset sequence it's not uncommon to see code like this:

  movl $0, 4(%rdi)
  movl $0, 8(%rdi)
  movl $0, 12(%rdi)
  movl $0, 0(%rdi)

Each of the stores is independent, and the scheduler is currently making an
arbitrary decision about the order.

//===---------------------------------------------------------------------===//

Another opportunitiy in this code is that the $0 could be moved to a register:

  movl $0, 4(%rdi)
  movl $0, 8(%rdi)
  movl $0, 12(%rdi)
  movl $0, 0(%rdi)

This would save substantial code size, especially for longer sequences like
this. It would be easy to have a rule telling isel to avoid matching MOV32mi
if the immediate has more than some fixed number of uses. It's more involved
to teach the register allocator how to do late folding to recover from
excessive register pressure.