llvm-6502/lib/CodeGen/CMakeLists.txt

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CMake
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add_llvm_library(LLVMCodeGen
AggressiveAntiDepBreaker.cpp
AllocationOrder.cpp
Analysis.cpp
BranchFolding.cpp
CalcSpillWeights.cpp
CallingConvLower.cpp
CodeGen.cpp
CodePlacementOpt.cpp
CriticalAntiDepBreaker.cpp
DeadMachineInstructionElim.cpp
DFAPacketizer.cpp
Add a new codegen pass that normalizes dwarf exception handling code in preparation for code generation. The main thing it does is handle the case when eh.exception calls (and, in a future patch, eh.selector calls) are far away from landing pads. Right now in practice you only find eh.exception calls close to landing pads: either in a landing pad (the common case) or in a landing pad successor, due to loop passes shifting them about. However future exception handling improvements will result in calls far from landing pads: (1) Inlining of rewinds. Consider the following case: In function @f: ... invoke @g to label %normal unwind label %unwinds ... unwinds: %ex = call i8* @llvm.eh.exception() ... In function @g: ... invoke @something to label %continue unwind label %handler ... handler: %ex = call i8* @llvm.eh.exception() ... perform cleanups ... "rethrow exception" Now inline @g into @f. Currently this is turned into: In function @f: ... invoke @something to label %continue unwind label %handler ... handler: %ex = call i8* @llvm.eh.exception() ... perform cleanups ... invoke "rethrow exception" to label %normal unwind label %unwinds unwinds: %ex = call i8* @llvm.eh.exception() ... However we would like to simplify invoke of "rethrow exception" into a branch to the %unwinds label. Then %unwinds is no longer a landing pad, and the eh.exception call there is then far away from any landing pads. (2) Using the unwind instruction for cleanups. It would be nice to have codegen handle the following case: invoke @something to label %continue unwind label %run_cleanups ... handler: ... perform cleanups ... unwind This requires turning "unwind" into a library call, which necessarily takes a pointer to the exception as an argument (this patch also does this unwind lowering). But that means you are using eh.exception again far from a landing pad. (3) Bugpoint simplifications. When bugpoint is simplifying exception handling code it often generates eh.exception calls far from a landing pad, which then causes codegen to assert. Bugpoint then latches on to this assertion and loses sight of the original problem. Note that it is currently rare for this pass to actually do anything. And in fact it normally shouldn't do anything at all given the code coming out of llvm-gcc! But it does fire a few times in the testsuite. As far as I can see this is almost always due to the LoopStrengthReduce codegen pass introducing pointless loop preheader blocks which are landing pads and only contain a branch to another block. This other block contains an eh.exception call. So probably by tweaking LoopStrengthReduce a bit this can be avoided. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72276 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-22 20:36:31 +00:00
DwarfEHPrepare.cpp
EarlyIfConversion.cpp
EdgeBundles.cpp
ExecutionDepsFix.cpp
ExpandISelPseudos.cpp
ExpandPostRAPseudos.cpp
GCMetadata.cpp
GCMetadataPrinter.cpp
GCStrategy.cpp
IfConversion.cpp
InlineSpiller.cpp
InterferenceCache.cpp
IntrinsicLowering.cpp
JITCodeEmitter.cpp
LLVMTargetMachine.cpp
LatencyPriorityQueue.cpp
LexicalScopes.cpp
LiveDebugVariables.cpp
LiveInterval.cpp
LiveIntervalAnalysis.cpp
LiveIntervalUnion.cpp
LiveRegMatrix.cpp
LiveStackAnalysis.cpp
LiveVariables.cpp
LiveRangeCalc.cpp
LiveRangeEdit.cpp
LocalStackSlotAllocation.cpp
MachineBasicBlock.cpp
MachineBlockFrequencyInfo.cpp
Implement a block placement pass based on the branch probability and block frequency analyses. This differs substantially from the existing block-placement pass in LLVM: 1) It operates on the Machine-IR in the CodeGen layer. This exposes much more (and more precise) information and opportunities. Also, the results are more stable due to fewer transforms ocurring after the pass runs. 2) It uses the generalized probability and frequency analyses. These can model static heuristics, code annotation derived heuristics as well as eventual profile loading. By basing the optimization on the analysis interface it can work from any (or a combination) of these inputs. 3) It uses a more aggressive algorithm, both building chains from tho bottom up to maximize benefit, and using an SCC-based walk to layout chains of blocks in a profitable ordering without O(N^2) iterations which the old pass involves. The pass is currently gated behind a flag, and not enabled by default because it still needs to grow some important features. Most notably, it needs to support loop aligning and careful layout of loop structures much as done by hand currently in CodePlacementOpt. Once it supports these, and has sufficient testing and quality tuning, it should replace both of these passes. Thanks to Nick Lewycky and Richard Smith for help authoring & debugging this, and to Jakob, Andy, Eric, Jim, and probably a few others I'm forgetting for reviewing and answering all my questions. Writing a backend pass is *sooo* much better now than it used to be. =D git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@142641 91177308-0d34-0410-b5e6-96231b3b80d8
2011-10-21 06:46:38 +00:00
MachineBlockPlacement.cpp
MachineBranchProbabilityInfo.cpp
MachineCodeEmitter.cpp
MachineCopyPropagation.cpp
MachineCSE.cpp
MachineDominators.cpp
MachinePostDominators.cpp
MachineFunction.cpp
MachineFunctionAnalysis.cpp
MachineFunctionPass.cpp
MachineFunctionPrinterPass.cpp
MachineInstr.cpp
MachineInstrBundle.cpp
MachineLICM.cpp
MachineLoopInfo.cpp
MachineLoopRanges.cpp
MachineModuleInfo.cpp
MachineModuleInfoImpls.cpp
MachinePassRegistry.cpp
MachineRegisterInfo.cpp
MachineSSAUpdater.cpp
MachineScheduler.cpp
MachineSink.cpp
MachineTraceMetrics.cpp
MachineVerifier.cpp
OcamlGC.cpp
OptimizePHIs.cpp
PHIElimination.cpp
PHIEliminationUtils.cpp
Passes.cpp
PeepholeOptimizer.cpp
PostRASchedulerList.cpp
ProcessImplicitDefs.cpp
PrologEpilogInserter.cpp
PseudoSourceValue.cpp
RegAllocBase.cpp
RegAllocBasic.cpp
RegAllocFast.cpp
RegAllocGreedy.cpp
RegAllocPBQP.cpp
RegisterClassInfo.cpp
RegisterCoalescer.cpp
RegisterPressure.cpp
RegisterScavenging.cpp
ScheduleDAG.cpp
ScheduleDAGInstrs.cpp
ScheduleDAGPrinter.cpp
ScoreboardHazardRecognizer.cpp
ShadowStackGC.cpp
ShrinkWrapping.cpp
SjLjEHPrepare.cpp
SlotIndexes.cpp
Spiller.cpp
SpillPlacement.cpp
SplitKit.cpp
StackProtector.cpp
StackSlotColoring.cpp
StackColoring.cpp
StrongPHIElimination.cpp
TailDuplication.cpp
TargetFrameLoweringImpl.cpp
TargetInstrInfoImpl.cpp
TargetLoweringObjectFileImpl.cpp
TargetOptionsImpl.cpp
TargetSchedule.cpp
TwoAddressInstructionPass.cpp
UnreachableBlockElim.cpp
VirtRegMap.cpp
)
add_dependencies(LLVMCodeGen intrinsics_gen)
add_subdirectory(SelectionDAG)
add_subdirectory(AsmPrinter)