//
//===---------------------------------------------------------------------===//
+#include "llvm/CodeGen/Passes.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/Verifier.h"
-#include "llvm/Transforms/Scalar.h"
-#include "llvm/PassManager.h"
+#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/CodeGen/GCStrategy.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/Passes.h"
#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/PassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Target/TargetLowering.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
+#include "llvm/Transforms/Scalar.h"
using namespace llvm;
static cl::opt<bool> DisableEarlyTailDup("disable-early-taildup", cl::Hidden,
cl::desc("Disable pre-register allocation tail duplication"));
static cl::opt<bool> DisableBlockPlacement("disable-block-placement",
- cl::Hidden, cl::desc("Disable the probability-driven block placement, and "
- "re-enable the old code placement pass"));
+ cl::Hidden, cl::desc("Disable probability-driven block placement"));
static cl::opt<bool> EnableBlockPlacementStats("enable-block-placement-stats",
cl::Hidden, cl::desc("Collect probability-driven block placement stats"));
-static cl::opt<bool> DisableCodePlace("disable-code-place", cl::Hidden,
- cl::desc("Disable code placement"));
static cl::opt<bool> DisableSSC("disable-ssc", cl::Hidden,
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 interval 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 PassID, bool Override) {
+static IdentifyingPassPtr applyDisable(IdentifyingPassPtr PassID,
+ bool Override) {
if (Override)
- return 0;
+ return IdentifyingPassPtr();
return PassID;
}
/// flags with ternary conditions. TargetID is passed through by default. The
/// pass is suppressed when the option is false. When the option is true, the
/// StandardID is selected if the target provides no default.
-static AnalysisID applyOverride(AnalysisID TargetID, cl::boolOrDefault Override,
- AnalysisID StandardID) {
+static IdentifyingPassPtr applyOverride(IdentifyingPassPtr TargetID,
+ cl::boolOrDefault Override,
+ AnalysisID StandardID) {
switch (Override) {
case cl::BOU_UNSET:
return TargetID;
case cl::BOU_TRUE:
- if (TargetID)
+ if (TargetID.isValid())
return TargetID;
if (StandardID == 0)
report_fatal_error("Target cannot enable pass");
return StandardID;
case cl::BOU_FALSE:
- return 0;
+ return IdentifyingPassPtr();
}
llvm_unreachable("Invalid command line option state");
}
/// StandardID may be a pseudo ID. In that case TargetID is the name of the real
/// pass to run. This allows multiple options to control a single pass depending
/// on where in the pipeline that pass is added.
-static AnalysisID overridePass(AnalysisID StandardID, AnalysisID TargetID) {
+static IdentifyingPassPtr overridePass(AnalysisID StandardID,
+ IdentifyingPassPtr TargetID) {
if (StandardID == &PostRASchedulerID)
return applyDisable(TargetID, DisablePostRA);
return applyDisable(TargetID, DisableEarlyTailDup);
if (StandardID == &MachineBlockPlacementID)
- return applyDisable(TargetID, DisableCodePlace);
-
- if (StandardID == &CodePlacementOptID)
- return applyDisable(TargetID, DisableCodePlace);
+ return applyDisable(TargetID, DisableBlockPlacement);
if (StandardID == &StackSlotColoringID)
return applyDisable(TargetID, DisableSSC);
if (StandardID == &DeadMachineInstructionElimID)
return applyDisable(TargetID, DisableMachineDCE);
+ if (StandardID == &EarlyIfConverterID)
+ return applyDisable(TargetID, DisableEarlyIfConversion);
+
if (StandardID == &MachineLICMID)
return applyDisable(TargetID, DisableMachineLICM);
// user interface. For example, a target may disable a standard pass by
// 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;
+ DenseMap<AnalysisID,IdentifyingPassPtr> TargetPasses;
/// Store the pairs of <AnalysisID, AnalysisID> of which the second pass
/// is inserted after each instance of the first one.
- SmallVector<std::pair<AnalysisID, AnalysisID>, 4> InsertedPasses;
+ SmallVector<std::pair<AnalysisID, IdentifyingPassPtr>, 4> InsertedPasses;
};
} // namespace llvm
// Out of line constructor provides default values for pass options and
// registers all common codegen passes.
TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm)
- : ImmutablePass(ID), PM(&pm), TM(tm), 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) {
substitutePass(&PostRAMachineLICMID, &MachineLICMID);
// Temporarily disable experimental passes.
- substitutePass(&MachineSchedulerID, 0);
+ const TargetSubtargetInfo &ST = TM->getSubtarget<TargetSubtargetInfo>();
+ if (!ST.enableMachineScheduler())
+ disablePass(&MachineSchedulerID);
}
/// Insert InsertedPassID pass after TargetPassID.
void TargetPassConfig::insertPass(AnalysisID TargetPassID,
- AnalysisID InsertedPassID) {
- assert(TargetPassID != InsertedPassID && "Insert a pass after itself!");
- std::pair<AnalysisID, AnalysisID> P(TargetPassID, InsertedPassID);
+ IdentifyingPassPtr InsertedPassID) {
+ assert(((!InsertedPassID.isInstance() &&
+ TargetPassID != InsertedPassID.getID()) ||
+ (InsertedPassID.isInstance() &&
+ TargetPassID != InsertedPassID.getInstance()->getPassID())) &&
+ "Insert a pass after itself!");
+ std::pair<AnalysisID, IdentifyingPassPtr> P(TargetPassID, InsertedPassID);
Impl->InsertedPasses.push_back(P);
}
}
void TargetPassConfig::substitutePass(AnalysisID StandardID,
- AnalysisID TargetID) {
+ IdentifyingPassPtr TargetID) {
Impl->TargetPasses[StandardID] = TargetID;
}
-AnalysisID TargetPassConfig::getPassSubstitution(AnalysisID ID) const {
- DenseMap<AnalysisID, AnalysisID>::const_iterator
+IdentifyingPassPtr TargetPassConfig::getPassSubstitution(AnalysisID ID) const {
+ DenseMap<AnalysisID, IdentifyingPassPtr>::const_iterator
I = Impl->TargetPasses.find(ID);
if (I == Impl->TargetPasses.end())
return ID;
return I->second;
}
-/// Add a pass to the PassManager.
+/// 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");
- PM->add(P);
+ // 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);
+ else
+ delete 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.
+///
+/// addPass cannot return a pointer to the pass instance because is internal the
+/// PassManager and the instance we create here may already be freed.
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");
- addPass(P);
+ IdentifyingPassPtr TargetID = getPassSubstitution(PassID);
+ IdentifyingPassPtr FinalPtr = overridePass(PassID, TargetID);
+ if (!FinalPtr.isValid())
+ return 0;
+
+ Pass *P;
+ if (FinalPtr.isInstance())
+ P = FinalPtr.getInstance();
+ else {
+ P = Pass::createPass(FinalPtr.getID());
+ if (!P)
+ llvm_unreachable("Pass ID not registered");
+ }
+ AnalysisID FinalID = P->getPassID();
+ addPass(P); // Ends the lifetime of P.
+
// Add the passes after the pass P if there is any.
- for (SmallVector<std::pair<AnalysisID, AnalysisID>, 4>::iterator
+ for (SmallVectorImpl<std::pair<AnalysisID, IdentifyingPassPtr> >::iterator
I = Impl->InsertedPasses.begin(), E = Impl->InsertedPasses.end();
I != E; ++I) {
if ((*I).first == PassID) {
- assert((*I).second && "Illegal Pass ID!");
- Pass *NP = Pass::createPass((*I).second);
- assert(NP && "Pass ID not registered");
+ assert((*I).second.isValid() && "Illegal Pass ID!");
+ Pass *NP;
+ if ((*I).second.isInstance())
+ NP = (*I).second.getInstance();
+ else {
+ NP = Pass::createPass((*I).second.getID());
+ assert(NP && "Pass ID not registered");
+ }
addPass(NP);
}
}
// Run loop strength reduction before anything else.
if (getOptLevel() != CodeGenOpt::None && !DisableLSR) {
- addPass(createLoopStrengthReducePass(getTargetLowering()));
+ addPass(createLoopStrengthReducePass());
if (PrintLSR)
addPass(createPrintFunctionPass("\n\n*** Code after LSR ***\n", &dbgs()));
}
// 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()));
+ addPass(createSjLjEHPreparePass(TM));
// FALLTHROUGH
case ExceptionHandling::DwarfCFI:
case ExceptionHandling::ARM:
addPass(createDwarfEHPass(TM));
break;
case ExceptionHandling::None:
- addPass(createLowerInvokePass(TM->getTargetLowering()));
+ addPass(createLowerInvokePass(TM));
// The lower invoke pass may create unreachable code. Remove it.
addPass(createUnreachableBlockEliminationPass());
}
}
+/// Add pass to prepare the LLVM IR for code generation. This should be done
+/// before exception handling preparation passes.
+void TargetPassConfig::addCodeGenPrepare() {
+ if (getOptLevel() != CodeGenOpt::None && !DisableCGP)
+ addPass(createCodeGenPreparePass(TM));
+}
+
/// Add common passes that perform LLVM IR to IR transforms in preparation for
/// instruction selection.
void TargetPassConfig::addISelPrepare() {
- if (getOptLevel() != CodeGenOpt::None && !DisableCGP)
- addPass(createCodeGenPreparePass(getTargetLowering()));
-
- addPass(createStackProtectorPass(getTargetLowering()));
+ addPass(createStackProtectorPass(TM));
addPreISel();
/// 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());
+ 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) {
addMachineSSAOptimization();
- }
- else {
+ } 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);
}
// GC
- addPass(&GCMachineCodeAnalysisID);
- if (PrintGCInfo)
- addPass(createGCInfoPrinter(dbgs()));
+ if (addGCPasses()) {
+ if (PrintGCInfo)
+ addPass(createGCInfoPrinter(dbgs()));
+ }
// Basic block placement.
if (getOptLevel() != CodeGenOpt::None)
// instructions dead.
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(&DeadMachineInstructionElimID);
printAndVerify("After codegen DCE pass");
+ // Allow targets to insert passes that improve instruction level parallelism,
+ // like if-conversion. Such passes will typically need dominator trees and
+ // loop info, just like LICM and CSE below.
+ if (addILPOpts())
+ printAndVerify("After ILP optimizations");
+
addPass(&MachineLICMID);
addPass(&MachineCSEID);
addPass(&MachineSinkingID);
addPass(&MachineLoopInfoID);
addPass(&PHIEliminationID);
}
+
+ // Eventually, we want to run LiveIntervals before PHI elimination.
+ if (EarlyLiveIntervals)
+ addPass(&LiveIntervalsID);
+
addPass(&TwoAddressInstructionPassID);
if (EnableStrongPHIElim)
addPass(&VirtRegRewriterID);
printAndVerify("After Virtual Register Rewriter");
- // FinalizeRegAlloc is convenient until MachineInstrBundles is more mature,
- // but eventually, all users of it should probably be moved to addPostRA and
- // it can go away. Currently, it's the intended place for targets to run
- // FinalizeMachineBundles, because passes other than MachineScheduling an
- // RegAlloc itself may not be aware of bundles.
- if (addFinalizeRegAlloc())
- printAndVerify("After RegAlloc finalization");
-
// Perform stack slot coloring and post-ra machine LICM.
//
// FIXME: Re-enable coloring with register when it's capable of adding
printAndVerify("After copy propagation pass");
}
+/// Add standard GC passes.
+bool TargetPassConfig::addGCPasses() {
+ addPass(&GCMachineCodeAnalysisID);
+ return true;
+}
+
/// Add standard basic block placement passes.
void TargetPassConfig::addBlockPlacement() {
- 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.
- PassID = addPass(&MachineBlockPlacementID);
- } else {
- PassID = addPass(&CodePlacementOptID);
- }
- if (PassID) {
+ if (addPass(&MachineBlockPlacementID)) {
// Run a separate pass to collect block placement statistics.
if (EnableBlockPlacementStats)
addPass(&MachineBlockPlacementStatsID);