#include "llvm/CodeGen/RegAllocRegistry.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
cl::desc("Disable Stack Slot Coloring"));
static cl::opt<bool> DisableMachineDCE("disable-machine-dce", cl::Hidden,
cl::desc("Disable Machine Dead Code Elimination"));
+static cl::opt<bool> DisableEarlyIfConversion("disable-early-ifcvt", cl::Hidden,
+ cl::desc("Disable Early If-conversion"));
static cl::opt<bool> DisableMachineLICM("disable-machine-licm", cl::Hidden,
cl::desc("Disable Machine LICM"));
static cl::opt<bool> DisableMachineCSE("disable-machine-cse", cl::Hidden,
cl::desc("Print machine instrs"),
cl::value_desc("pass-name"), cl::init("option-unspecified"));
+// Experimental option to run live inteerval analysis early.
+static cl::opt<bool> EarlyLiveIntervals("early-live-intervals", cl::Hidden,
+ cl::desc("Run live interval analysis earlier in the pipeline"));
+
/// Allow standard passes to be disabled by command line options. This supports
/// simple binary flags that either suppress the pass or do nothing.
/// i.e. -disable-mypass=false has no effect.
/// These should be converted to boolOrDefault in order to use applyOverride.
-static AnalysisID applyDisable(AnalysisID ID, bool Override) {
+static AnalysisID applyDisable(AnalysisID PassID, bool Override) {
if (Override)
- return &NoPassID;
- return ID;
+ return 0;
+ return PassID;
}
/// Allow Pass selection to be overriden by command line options. This supports
case cl::BOU_UNSET:
return TargetID;
case cl::BOU_TRUE:
- if (TargetID != &NoPassID)
+ if (TargetID)
return TargetID;
- if (StandardID == &NoPassID)
+ if (StandardID == 0)
report_fatal_error("Target cannot enable pass");
return StandardID;
case cl::BOU_FALSE:
- return &NoPassID;
+ return 0;
}
llvm_unreachable("Invalid command line option state");
}
if (StandardID == &DeadMachineInstructionElimID)
return applyDisable(TargetID, DisableMachineDCE);
+ if (StandardID == &EarlyIfConverterID)
+ return applyDisable(TargetID, DisableEarlyIfConversion);
+
if (StandardID == &MachineLICMID)
return applyDisable(TargetID, DisableMachineLICM);
"Target Pass Configuration", false, false)
char TargetPassConfig::ID = 0;
-static char NoPassIDAnchor = 0;
-char &llvm::NoPassID = NoPassIDAnchor;
-
// Pseudo Pass IDs.
char TargetPassConfig::EarlyTailDuplicateID = 0;
char TargetPassConfig::PostRAMachineLICMID = 0;
// that are part of a standard pass pipeline without overridding the entire
// pipeline. This mechanism allows target options to inherit a standard pass's
// user interface. For example, a target may disable a standard pass by
- // default by substituting NoPass, and the user may still enable that standard
- // pass with an explicit command line option.
+ // default by substituting a pass ID of zero, and the user may still enable
+ // that standard pass with an explicit command line option.
DenseMap<AnalysisID,AnalysisID> TargetPasses;
/// Store the pairs of <AnalysisID, AnalysisID> of which the second pass
// Out of line constructor provides default values for pass options and
// registers all common codegen passes.
TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm)
- : ImmutablePass(ID), TM(tm), PM(&pm), Impl(0), Initialized(false),
+ : ImmutablePass(ID), PM(&pm), StartAfter(0), StopAfter(0),
+ Started(true), Stopped(false), TM(tm), Impl(0), Initialized(false),
DisableVerify(false),
EnableTailMerge(true) {
initializeCodeGen(*PassRegistry::getPassRegistry());
// Substitute Pseudo Pass IDs for real ones.
- substitutePass(EarlyTailDuplicateID, TailDuplicateID);
- substitutePass(PostRAMachineLICMID, MachineLICMID);
+ substitutePass(&EarlyTailDuplicateID, &TailDuplicateID);
+ substitutePass(&PostRAMachineLICMID, &MachineLICMID);
+
+ // Disable early if-conversion. Targets that are ready can enable it.
+ disablePass(&EarlyIfConverterID);
// Temporarily disable experimental passes.
- substitutePass(MachineSchedulerID, NoPassID);
+ substitutePass(&MachineSchedulerID, 0);
}
/// Insert InsertedPassID pass after TargetPassID.
-void TargetPassConfig::insertPass(const char &TargetPassID,
- const char &InsertedPassID) {
- assert(&TargetPassID != &InsertedPassID && "Insert a pass after itself!");
- std::pair<AnalysisID, AnalysisID> P(&TargetPassID, &InsertedPassID);
+void TargetPassConfig::insertPass(AnalysisID TargetPassID,
+ AnalysisID InsertedPassID) {
+ assert(TargetPassID != InsertedPassID && "Insert a pass after itself!");
+ std::pair<AnalysisID, AnalysisID> P(TargetPassID, InsertedPassID);
Impl->InsertedPasses.push_back(P);
}
Opt = Val;
}
-void TargetPassConfig::substitutePass(char &StandardID, char &TargetID) {
- Impl->TargetPasses[&StandardID] = &TargetID;
+void TargetPassConfig::substitutePass(AnalysisID StandardID,
+ AnalysisID TargetID) {
+ Impl->TargetPasses[StandardID] = TargetID;
}
AnalysisID TargetPassConfig::getPassSubstitution(AnalysisID ID) const {
return I->second;
}
-/// Add a CodeGen pass at this point in the pipeline after checking for target
-/// and command line overrides.
-AnalysisID TargetPassConfig::addPass(char &ID) {
+/// Add a pass to the PassManager if that pass is supposed to be run. If the
+/// Started/Stopped flags indicate either that the compilation should start at
+/// a later pass or that it should stop after an earlier pass, then do not add
+/// the pass. Finally, compare the current pass against the StartAfter
+/// and StopAfter options and change the Started/Stopped flags accordingly.
+void TargetPassConfig::addPass(Pass *P) {
assert(!Initialized && "PassConfig is immutable");
- AnalysisID TargetID = getPassSubstitution(&ID);
- AnalysisID FinalID = overridePass(&ID, TargetID);
- if (FinalID == &NoPassID)
+ // Cache the Pass ID here in case the pass manager finds this pass is
+ // redundant with ones already scheduled / available, and deletes it.
+ // Fundamentally, once we add the pass to the manager, we no longer own it
+ // and shouldn't reference it.
+ AnalysisID PassID = P->getPassID();
+
+ if (Started && !Stopped)
+ PM->add(P);
+ if (StopAfter == PassID)
+ Stopped = true;
+ if (StartAfter == PassID)
+ Started = true;
+ if (Stopped && !Started)
+ report_fatal_error("Cannot stop compilation after pass that is not run");
+}
+
+/// Add a CodeGen pass at this point in the pipeline after checking for target
+/// and command line overrides.
+AnalysisID TargetPassConfig::addPass(AnalysisID PassID) {
+ AnalysisID TargetID = getPassSubstitution(PassID);
+ AnalysisID FinalID = overridePass(PassID, TargetID);
+ if (FinalID == 0)
return FinalID;
Pass *P = Pass::createPass(FinalID);
if (!P)
llvm_unreachable("Pass ID not registered");
- PM->add(P);
+ addPass(P);
// Add the passes after the pass P if there is any.
for (SmallVector<std::pair<AnalysisID, AnalysisID>, 4>::iterator
I = Impl->InsertedPasses.begin(), E = Impl->InsertedPasses.end();
I != E; ++I) {
- if ((*I).first == &ID) {
+ if ((*I).first == PassID) {
assert((*I).second && "Illegal Pass ID!");
Pass *NP = Pass::createPass((*I).second);
assert(NP && "Pass ID not registered");
- PM->add(NP);
+ addPass(NP);
}
}
return FinalID;
}
-void TargetPassConfig::printAndVerify(const char *Banner) const {
+void TargetPassConfig::printAndVerify(const char *Banner) {
if (TM->shouldPrintMachineCode())
- PM->add(createMachineFunctionPrinterPass(dbgs(), Banner));
+ addPass(createMachineFunctionPrinterPass(dbgs(), Banner));
if (VerifyMachineCode)
- PM->add(createMachineVerifierPass(Banner));
+ addPass(createMachineVerifierPass(Banner));
}
/// Add common target configurable passes that perform LLVM IR to IR transforms
// Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
// BasicAliasAnalysis wins if they disagree. This is intended to help
// support "obvious" type-punning idioms.
- PM->add(createTypeBasedAliasAnalysisPass());
- PM->add(createBasicAliasAnalysisPass());
+ addPass(createTypeBasedAliasAnalysisPass());
+ addPass(createBasicAliasAnalysisPass());
// Before running any passes, run the verifier to determine if the input
// coming from the front-end and/or optimizer is valid.
if (!DisableVerify)
- PM->add(createVerifierPass());
+ addPass(createVerifierPass());
// Run loop strength reduction before anything else.
if (getOptLevel() != CodeGenOpt::None && !DisableLSR) {
- PM->add(createLoopStrengthReducePass(getTargetLowering()));
+ addPass(createLoopStrengthReducePass());
if (PrintLSR)
- PM->add(createPrintFunctionPass("\n\n*** Code after LSR ***\n", &dbgs()));
+ addPass(createPrintFunctionPass("\n\n*** Code after LSR ***\n", &dbgs()));
}
- PM->add(createGCLoweringPass());
+ addPass(createGCLoweringPass());
// Make sure that no unreachable blocks are instruction selected.
- PM->add(createUnreachableBlockEliminationPass());
+ addPass(createUnreachableBlockEliminationPass());
+}
+
+/// Turn exception handling constructs into something the code generators can
+/// handle.
+void TargetPassConfig::addPassesToHandleExceptions() {
+ switch (TM->getMCAsmInfo()->getExceptionHandlingType()) {
+ case ExceptionHandling::SjLj:
+ // SjLj piggy-backs on dwarf for this bit. The cleanups done apply to both
+ // Dwarf EH prepare needs to be run after SjLj prepare. Otherwise,
+ // catch info can get misplaced when a selector ends up more than one block
+ // removed from the parent invoke(s). This could happen when a landing
+ // pad is shared by multiple invokes and is also a target of a normal
+ // edge from elsewhere.
+ addPass(createSjLjEHPreparePass(TM->getTargetLowering()));
+ // FALLTHROUGH
+ case ExceptionHandling::DwarfCFI:
+ case ExceptionHandling::ARM:
+ case ExceptionHandling::Win64:
+ addPass(createDwarfEHPass(TM));
+ break;
+ case ExceptionHandling::None:
+ addPass(createLowerInvokePass());
+
+ // The lower invoke pass may create unreachable code. Remove it.
+ addPass(createUnreachableBlockEliminationPass());
+ break;
+ }
}
/// Add common passes that perform LLVM IR to IR transforms in preparation for
/// instruction selection.
void TargetPassConfig::addISelPrepare() {
if (getOptLevel() != CodeGenOpt::None && !DisableCGP)
- PM->add(createCodeGenPreparePass(getTargetLowering()));
+ addPass(createCodeGenPreparePass(getTargetLowering()));
- PM->add(createStackProtectorPass(getTargetLowering()));
+ addPass(createStackProtectorPass(getTargetLowering()));
addPreISel();
if (PrintISelInput)
- PM->add(createPrintFunctionPass("\n\n"
+ addPass(createPrintFunctionPass("\n\n"
"*** Final LLVM Code input to ISel ***\n",
&dbgs()));
// All passes which modify the LLVM IR are now complete; run the verifier
// to ensure that the IR is valid.
if (!DisableVerify)
- PM->add(createVerifierPass());
+ addPass(createVerifierPass());
}
/// Add the complete set of target-independent postISel code generator passes.
/// TODO: We could use a single addPre/Post(ID) hook to allow pass injection
/// before/after any target-independent pass. But it's currently overkill.
void TargetPassConfig::addMachinePasses() {
- // Print the instruction selected machine code...
- printAndVerify("After Instruction Selection");
-
// Insert a machine instr printer pass after the specified pass.
// If -print-machineinstrs specified, print machineinstrs after all passes.
if (StringRef(PrintMachineInstrs.getValue()).equals(""))
const PassInfo *TPI = PR->getPassInfo(PrintMachineInstrs.getValue());
const PassInfo *IPI = PR->getPassInfo(StringRef("print-machineinstrs"));
assert (TPI && IPI && "Pass ID not registered!");
- const char *TID = (char *)(TPI->getTypeInfo());
- const char *IID = (char *)(IPI->getTypeInfo());
- insertPass(*TID, *IID);
+ const char *TID = (const char *)(TPI->getTypeInfo());
+ const char *IID = (const char *)(IPI->getTypeInfo());
+ insertPass(TID, IID);
}
+ // Print the instruction selected machine code...
+ printAndVerify("After Instruction Selection");
+
// Expand pseudo-instructions emitted by ISel.
- addPass(ExpandISelPseudosID);
+ if (addPass(&ExpandISelPseudosID))
+ printAndVerify("After ExpandISelPseudos");
// Add passes that optimize machine instructions in SSA form.
if (getOptLevel() != CodeGenOpt::None) {
else {
// If the target requests it, assign local variables to stack slots relative
// to one another and simplify frame index references where possible.
- addPass(LocalStackSlotAllocationID);
+ addPass(&LocalStackSlotAllocationID);
}
// Run pre-ra passes.
printAndVerify("After PostRegAlloc passes");
// Insert prolog/epilog code. Eliminate abstract frame index references...
- addPass(PrologEpilogCodeInserterID);
+ addPass(&PrologEpilogCodeInserterID);
printAndVerify("After PrologEpilogCodeInserter");
/// Add passes that optimize machine instructions after register allocation.
addMachineLateOptimization();
// Expand pseudo instructions before second scheduling pass.
- addPass(ExpandPostRAPseudosID);
+ addPass(&ExpandPostRAPseudosID);
printAndVerify("After ExpandPostRAPseudos");
// Run pre-sched2 passes.
// Second pass scheduler.
if (getOptLevel() != CodeGenOpt::None) {
- addPass(PostRASchedulerID);
+ addPass(&PostRASchedulerID);
printAndVerify("After PostRAScheduler");
}
// GC
- addPass(GCMachineCodeAnalysisID);
+ addPass(&GCMachineCodeAnalysisID);
if (PrintGCInfo)
- PM->add(createGCInfoPrinter(dbgs()));
+ addPass(createGCInfoPrinter(dbgs()));
// Basic block placement.
if (getOptLevel() != CodeGenOpt::None)
/// Add passes that optimize machine instructions in SSA form.
void TargetPassConfig::addMachineSSAOptimization() {
// Pre-ra tail duplication.
- if (addPass(EarlyTailDuplicateID) != &NoPassID)
+ if (addPass(&EarlyTailDuplicateID))
printAndVerify("After Pre-RegAlloc TailDuplicate");
// Optimize PHIs before DCE: removing dead PHI cycles may make more
// instructions dead.
- addPass(OptimizePHIsID);
+ addPass(&OptimizePHIsID);
+
+ // This pass merges large allocas. StackSlotColoring is a different pass
+ // which merges spill slots.
+ addPass(&StackColoringID);
// If the target requests it, assign local variables to stack slots relative
// to one another and simplify frame index references where possible.
- addPass(LocalStackSlotAllocationID);
+ addPass(&LocalStackSlotAllocationID);
// With optimization, dead code should already be eliminated. However
// there is one known exception: lowered code for arguments that are only
// used by tail calls, where the tail calls reuse the incoming stack
// arguments directly (see t11 in test/CodeGen/X86/sibcall.ll).
- addPass(DeadMachineInstructionElimID);
+ addPass(&DeadMachineInstructionElimID);
printAndVerify("After codegen DCE pass");
- addPass(MachineLICMID);
- addPass(MachineCSEID);
- addPass(MachineSinkingID);
+ addPass(&EarlyIfConverterID);
+ addPass(&MachineLICMID);
+ addPass(&MachineCSEID);
+ addPass(&MachineSinkingID);
printAndVerify("After Machine LICM, CSE and Sinking passes");
- addPass(PeepholeOptimizerID);
+ addPass(&PeepholeOptimizerID);
printAndVerify("After codegen peephole optimization pass");
}
/// Add the minimum set of target-independent passes that are required for
/// register allocation. No coalescing or scheduling.
void TargetPassConfig::addFastRegAlloc(FunctionPass *RegAllocPass) {
- addPass(PHIEliminationID);
- addPass(TwoAddressInstructionPassID);
+ addPass(&PHIEliminationID);
+ addPass(&TwoAddressInstructionPassID);
- PM->add(RegAllocPass);
+ addPass(RegAllocPass);
printAndVerify("After Register Allocation");
}
/// optimized register allocation, including coalescing, machine instruction
/// scheduling, and register allocation itself.
void TargetPassConfig::addOptimizedRegAlloc(FunctionPass *RegAllocPass) {
- addPass(ProcessImplicitDefsID);
+ addPass(&ProcessImplicitDefsID);
// LiveVariables currently requires pure SSA form.
//
// LiveVariables can be removed completely, and LiveIntervals can be directly
// computed. (We still either need to regenerate kill flags after regalloc, or
// preferably fix the scavenger to not depend on them).
- addPass(LiveVariablesID);
+ addPass(&LiveVariablesID);
// Add passes that move from transformed SSA into conventional SSA. This is a
// "copy coalescing" problem.
//
if (!EnableStrongPHIElim) {
// Edge splitting is smarter with machine loop info.
- addPass(MachineLoopInfoID);
- addPass(PHIEliminationID);
+ addPass(&MachineLoopInfoID);
+ addPass(&PHIEliminationID);
}
- addPass(TwoAddressInstructionPassID);
+
+ // Eventually, we want to run LiveIntervals before PHI elimination.
+ if (EarlyLiveIntervals)
+ addPass(&LiveIntervalsID);
+
+ addPass(&TwoAddressInstructionPassID);
if (EnableStrongPHIElim)
- addPass(StrongPHIEliminationID);
+ addPass(&StrongPHIEliminationID);
- addPass(RegisterCoalescerID);
+ addPass(&RegisterCoalescerID);
// PreRA instruction scheduling.
- if (addPass(MachineSchedulerID) != &NoPassID)
+ if (addPass(&MachineSchedulerID))
printAndVerify("After Machine Scheduling");
// Add the selected register allocation pass.
- PM->add(RegAllocPass);
- printAndVerify("After Register Allocation");
+ addPass(RegAllocPass);
+ printAndVerify("After Register Allocation, before rewriter");
+
+ // Allow targets to change the register assignments before rewriting.
+ if (addPreRewrite())
+ printAndVerify("After pre-rewrite passes");
// Finally rewrite virtual registers.
- addPass(VirtRegRewriterID);
+ addPass(&VirtRegRewriterID);
printAndVerify("After Virtual Register Rewriter");
// FinalizeRegAlloc is convenient until MachineInstrBundles is more mature,
//
// FIXME: Re-enable coloring with register when it's capable of adding
// kill markers.
- addPass(StackSlotColoringID);
+ addPass(&StackSlotColoringID);
// Run post-ra machine LICM to hoist reloads / remats.
//
// FIXME: can this move into MachineLateOptimization?
- addPass(PostRAMachineLICMID);
+ addPass(&PostRAMachineLICMID);
printAndVerify("After StackSlotColoring and postra Machine LICM");
}
/// Add passes that optimize machine instructions after register allocation.
void TargetPassConfig::addMachineLateOptimization() {
// Branch folding must be run after regalloc and prolog/epilog insertion.
- if (addPass(BranchFolderPassID) != &NoPassID)
+ if (addPass(&BranchFolderPassID))
printAndVerify("After BranchFolding");
// Tail duplication.
- if (addPass(TailDuplicateID) != &NoPassID)
+ if (addPass(&TailDuplicateID))
printAndVerify("After TailDuplicate");
// Copy propagation.
- if (addPass(MachineCopyPropagationID) != &NoPassID)
+ if (addPass(&MachineCopyPropagationID))
printAndVerify("After copy propagation pass");
}
/// Add standard basic block placement passes.
void TargetPassConfig::addBlockPlacement() {
- AnalysisID ID = &NoPassID;
+ AnalysisID PassID = 0;
if (!DisableBlockPlacement) {
// MachineBlockPlacement is a new pass which subsumes the functionality of
// CodPlacementOpt. The old code placement pass can be restored by
// disabling block placement, but eventually it will be removed.
- ID = addPass(MachineBlockPlacementID);
+ PassID = addPass(&MachineBlockPlacementID);
} else {
- ID = addPass(CodePlacementOptID);
+ PassID = addPass(&CodePlacementOptID);
}
- if (ID != &NoPassID) {
+ if (PassID) {
// Run a separate pass to collect block placement statistics.
if (EnableBlockPlacementStats)
- addPass(MachineBlockPlacementStatsID);
+ addPass(&MachineBlockPlacementStatsID);
printAndVerify("After machine block placement.");
}
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