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llvm-project/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
Sjoerd Meijer 233659c7ae [LoopFlatten] Enable it by default 
LoopFlatten has been in the code base off by default for years, but this
enables it to run by default. Downstream this has been running for
years, so it has been exposed to quite some code. Then around the time
we switched to the NPM, several fixes went in related to updating the
MemorySSA state and we moved it to a loop pass manager, which both
helped preventing rerunning certain analysis passes, and thus helped a
bit with compile-times.

About compile-times, adding a pass isn't free, but this should see only
very minor increases. The pass is relatively simple and there shouldn't
be anything algorithmically expensive because all it does is looking at
inner/outer loops and it checks assumptions on loop increments and
indices. If we see increases, I expect this to mainly come from
invalidation of analysis info, and perhaps subsequent passes to trigger
and do more. Despite its simplicity/restrictions, it triggers in most
code-bases, which makes it worth to enable this by default.

Differential Revision: https://reviews.llvm.org/D109958
2022-10-17 17:11:39 +05:30

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//===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the PassManagerBuilder class, which is used to set up a
// "standard" optimization sequence suitable for languages like C and C++.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
#include "llvm-c/Transforms/PassManagerBuilder.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Analysis/CFLAndersAliasAnalysis.h"
#include "llvm/Analysis/CFLSteensAliasAnalysis.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/ScopedNoAliasAA.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/TypeBasedAliasAnalysis.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Target/CGPassBuilderOption.h"
#include "llvm/Transforms/AggressiveInstCombine/AggressiveInstCombine.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Transforms/IPO/Attributor.h"
#include "llvm/Transforms/IPO/ForceFunctionAttrs.h"
#include "llvm/Transforms/IPO/FunctionAttrs.h"
#include "llvm/Transforms/IPO/InferFunctionAttrs.h"
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Scalar/GVN.h"
#include "llvm/Transforms/Scalar/LICM.h"
#include "llvm/Transforms/Scalar/LoopUnrollPass.h"
#include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h"
#include "llvm/Transforms/Utils.h"
#include "llvm/Transforms/Vectorize.h"
using namespace llvm;
namespace llvm {
cl::opt<bool> RunPartialInlining("enable-partial-inlining", cl::Hidden,
cl::desc("Run Partial inlinining pass"));
static cl::opt<bool>
UseGVNAfterVectorization("use-gvn-after-vectorization",
cl::init(false), cl::Hidden,
cl::desc("Run GVN instead of Early CSE after vectorization passes"));
cl::opt<bool> ExtraVectorizerPasses(
"extra-vectorizer-passes", cl::init(false), cl::Hidden,
cl::desc("Run cleanup optimization passes after vectorization."));
static cl::opt<bool>
RunLoopRerolling("reroll-loops", cl::Hidden,
cl::desc("Run the loop rerolling pass"));
cl::opt<bool> RunNewGVN("enable-newgvn", cl::init(false), cl::Hidden,
cl::desc("Run the NewGVN pass"));
// Experimental option to use CFL-AA
static cl::opt<::CFLAAType>
UseCFLAA("use-cfl-aa", cl::init(::CFLAAType::None), cl::Hidden,
cl::desc("Enable the new, experimental CFL alias analysis"),
cl::values(clEnumValN(::CFLAAType::None, "none", "Disable CFL-AA"),
clEnumValN(::CFLAAType::Steensgaard, "steens",
"Enable unification-based CFL-AA"),
clEnumValN(::CFLAAType::Andersen, "anders",
"Enable inclusion-based CFL-AA"),
clEnumValN(::CFLAAType::Both, "both",
"Enable both variants of CFL-AA")));
cl::opt<bool> EnableLoopInterchange(
"enable-loopinterchange", cl::init(false), cl::Hidden,
cl::desc("Enable the experimental LoopInterchange Pass"));
cl::opt<bool> EnableUnrollAndJam("enable-unroll-and-jam", cl::init(false),
cl::Hidden,
cl::desc("Enable Unroll And Jam Pass"));
cl::opt<bool> EnableLoopFlatten("enable-loop-flatten", cl::init(true),
cl::Hidden,
cl::desc("Enable the LoopFlatten Pass"));
cl::opt<bool> EnableDFAJumpThreading("enable-dfa-jump-thread",
cl::desc("Enable DFA jump threading."),
cl::init(false), cl::Hidden);
cl::opt<bool> EnableHotColdSplit("hot-cold-split",
cl::desc("Enable hot-cold splitting pass"));
cl::opt<bool> EnableIROutliner("ir-outliner", cl::init(false), cl::Hidden,
cl::desc("Enable ir outliner pass"));
static cl::opt<bool> UseLoopVersioningLICM(
"enable-loop-versioning-licm", cl::init(false), cl::Hidden,
cl::desc("Enable the experimental Loop Versioning LICM pass"));
cl::opt<bool>
DisablePreInliner("disable-preinline", cl::init(false), cl::Hidden,
cl::desc("Disable pre-instrumentation inliner"));
cl::opt<int> PreInlineThreshold(
"preinline-threshold", cl::Hidden, cl::init(75),
cl::desc("Control the amount of inlining in pre-instrumentation inliner "
"(default = 75)"));
cl::opt<bool>
EnableGVNHoist("enable-gvn-hoist",
cl::desc("Enable the GVN hoisting pass (default = off)"));
static cl::opt<bool>
DisableLibCallsShrinkWrap("disable-libcalls-shrinkwrap", cl::init(false),
cl::Hidden,
cl::desc("Disable shrink-wrap library calls"));
cl::opt<bool>
EnableGVNSink("enable-gvn-sink",
cl::desc("Enable the GVN sinking pass (default = off)"));
// This option is used in simplifying testing SampleFDO optimizations for
// profile loading.
cl::opt<bool>
EnableCHR("enable-chr", cl::init(true), cl::Hidden,
cl::desc("Enable control height reduction optimization (CHR)"));
cl::opt<bool> FlattenedProfileUsed(
"flattened-profile-used", cl::init(false), cl::Hidden,
cl::desc("Indicate the sample profile being used is flattened, i.e., "
"no inline hierachy exists in the profile. "));
cl::opt<bool> EnableOrderFileInstrumentation(
"enable-order-file-instrumentation", cl::init(false), cl::Hidden,
cl::desc("Enable order file instrumentation (default = off)"));
cl::opt<bool> EnableMatrix(
"enable-matrix", cl::init(false), cl::Hidden,
cl::desc("Enable lowering of the matrix intrinsics"));
cl::opt<bool> EnableConstraintElimination(
"enable-constraint-elimination", cl::init(false), cl::Hidden,
cl::desc(
"Enable pass to eliminate conditions based on linear constraints."));
cl::opt<bool> EnableFunctionSpecialization(
"enable-function-specialization", cl::init(false), cl::Hidden,
cl::desc("Enable Function Specialization pass"));
cl::opt<AttributorRunOption> AttributorRun(
"attributor-enable", cl::Hidden, cl::init(AttributorRunOption::NONE),
cl::desc("Enable the attributor inter-procedural deduction pass."),
cl::values(clEnumValN(AttributorRunOption::ALL, "all",
"enable all attributor runs"),
clEnumValN(AttributorRunOption::MODULE, "module",
"enable module-wide attributor runs"),
clEnumValN(AttributorRunOption::CGSCC, "cgscc",
"enable call graph SCC attributor runs"),
clEnumValN(AttributorRunOption::NONE, "none",
"disable attributor runs")));
extern cl::opt<bool> EnableKnowledgeRetention;
} // namespace llvm
PassManagerBuilder::PassManagerBuilder() {
OptLevel = 2;
SizeLevel = 0;
LibraryInfo = nullptr;
Inliner = nullptr;
DisableUnrollLoops = false;
SLPVectorize = false;
LoopVectorize = true;
LoopsInterleaved = true;
RerollLoops = RunLoopRerolling;
NewGVN = RunNewGVN;
LicmMssaOptCap = SetLicmMssaOptCap;
LicmMssaNoAccForPromotionCap = SetLicmMssaNoAccForPromotionCap;
DisableGVNLoadPRE = false;
ForgetAllSCEVInLoopUnroll = ForgetSCEVInLoopUnroll;
VerifyInput = false;
VerifyOutput = false;
MergeFunctions = false;
DivergentTarget = false;
CallGraphProfile = true;
}
PassManagerBuilder::~PassManagerBuilder() {
delete LibraryInfo;
delete Inliner;
}
/// Set of global extensions, automatically added as part of the standard set.
static ManagedStatic<
SmallVector<std::tuple<PassManagerBuilder::ExtensionPointTy,
PassManagerBuilder::ExtensionFn,
PassManagerBuilder::GlobalExtensionID>,
8>>
GlobalExtensions;
static PassManagerBuilder::GlobalExtensionID GlobalExtensionsCounter;
/// Check if GlobalExtensions is constructed and not empty.
/// Since GlobalExtensions is a managed static, calling 'empty()' will trigger
/// the construction of the object.
static bool GlobalExtensionsNotEmpty() {
return GlobalExtensions.isConstructed() && !GlobalExtensions->empty();
}
PassManagerBuilder::GlobalExtensionID
PassManagerBuilder::addGlobalExtension(PassManagerBuilder::ExtensionPointTy Ty,
PassManagerBuilder::ExtensionFn Fn) {
auto ExtensionID = GlobalExtensionsCounter++;
GlobalExtensions->push_back(std::make_tuple(Ty, std::move(Fn), ExtensionID));
return ExtensionID;
}
void PassManagerBuilder::removeGlobalExtension(
PassManagerBuilder::GlobalExtensionID ExtensionID) {
// RegisterStandardPasses may try to call this function after GlobalExtensions
// has already been destroyed; doing so should not generate an error.
if (!GlobalExtensions.isConstructed())
return;
auto GlobalExtension =
llvm::find_if(*GlobalExtensions, [ExtensionID](const auto &elem) {
return std::get<2>(elem) == ExtensionID;
});
assert(GlobalExtension != GlobalExtensions->end() &&
"The extension ID to be removed should always be valid.");
GlobalExtensions->erase(GlobalExtension);
}
void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
Extensions.push_back(std::make_pair(Ty, std::move(Fn)));
}
void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy,
legacy::PassManagerBase &PM) const {
if (GlobalExtensionsNotEmpty()) {
for (auto &Ext : *GlobalExtensions) {
if (std::get<0>(Ext) == ETy)
std::get<1>(Ext)(*this, PM);
}
}
for (const auto &[PT, Fn] : Extensions)
if (PT == ETy)
Fn(*this, PM);
}
void PassManagerBuilder::addInitialAliasAnalysisPasses(
legacy::PassManagerBase &PM) const {
switch (UseCFLAA) {
case ::CFLAAType::Steensgaard:
PM.add(createCFLSteensAAWrapperPass());
break;
case ::CFLAAType::Andersen:
PM.add(createCFLAndersAAWrapperPass());
break;
case ::CFLAAType::Both:
PM.add(createCFLSteensAAWrapperPass());
PM.add(createCFLAndersAAWrapperPass());
break;
default:
break;
}
// Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
// BasicAliasAnalysis wins if they disagree. This is intended to help
// support "obvious" type-punning idioms.
PM.add(createTypeBasedAAWrapperPass());
PM.add(createScopedNoAliasAAWrapperPass());
}
void PassManagerBuilder::populateFunctionPassManager(
legacy::FunctionPassManager &FPM) {
addExtensionsToPM(EP_EarlyAsPossible, FPM);
// Add LibraryInfo if we have some.
if (LibraryInfo)
FPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo));
// The backends do not handle matrix intrinsics currently.
// Make sure they are also lowered in O0.
// FIXME: A lightweight version of the pass should run in the backend
// pipeline on demand.
if (EnableMatrix && OptLevel == 0)
FPM.add(createLowerMatrixIntrinsicsMinimalPass());
if (OptLevel == 0) return;
addInitialAliasAnalysisPasses(FPM);
// Lower llvm.expect to metadata before attempting transforms.
// Compare/branch metadata may alter the behavior of passes like SimplifyCFG.
FPM.add(createLowerExpectIntrinsicPass());
FPM.add(createCFGSimplificationPass());
FPM.add(createSROAPass());
FPM.add(createEarlyCSEPass());
}
void PassManagerBuilder::addFunctionSimplificationPasses(
legacy::PassManagerBase &MPM) {
// Start of function pass.
// Break up aggregate allocas, using SSAUpdater.
assert(OptLevel >= 1 && "Calling function optimizer with no optimization level!");
MPM.add(createSROAPass());
MPM.add(createEarlyCSEPass(true /* Enable mem-ssa. */)); // Catch trivial redundancies
if (EnableKnowledgeRetention)
MPM.add(createAssumeSimplifyPass());
if (OptLevel > 1) {
if (EnableGVNHoist)
MPM.add(createGVNHoistPass());
if (EnableGVNSink) {
MPM.add(createGVNSinkPass());
MPM.add(createCFGSimplificationPass(
SimplifyCFGOptions().convertSwitchRangeToICmp(true)));
}
}
if (EnableConstraintElimination)
MPM.add(createConstraintEliminationPass());
if (OptLevel > 1) {
// Speculative execution if the target has divergent branches; otherwise nop.
MPM.add(createSpeculativeExecutionIfHasBranchDivergencePass());
MPM.add(createJumpThreadingPass()); // Thread jumps.
MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
}
MPM.add(
createCFGSimplificationPass(SimplifyCFGOptions().convertSwitchRangeToICmp(
true))); // Merge & remove BBs
// Combine silly seq's
if (OptLevel > 2)
MPM.add(createAggressiveInstCombinerPass());
MPM.add(createInstructionCombiningPass());
if (SizeLevel == 0 && !DisableLibCallsShrinkWrap)
MPM.add(createLibCallsShrinkWrapPass());
addExtensionsToPM(EP_Peephole, MPM);
// TODO: Investigate the cost/benefit of tail call elimination on debugging.
if (OptLevel > 1)
MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
MPM.add(
createCFGSimplificationPass(SimplifyCFGOptions().convertSwitchRangeToICmp(
true))); // Merge & remove BBs
MPM.add(createReassociatePass()); // Reassociate expressions
// The matrix extension can introduce large vector operations early, which can
// benefit from running vector-combine early on.
if (EnableMatrix)
MPM.add(createVectorCombinePass());
// Begin the loop pass pipeline.
// The simple loop unswitch pass relies on separate cleanup passes. Schedule
// them first so when we re-process a loop they run before other loop
// passes.
MPM.add(createLoopInstSimplifyPass());
MPM.add(createLoopSimplifyCFGPass());
// Try to remove as much code from the loop header as possible,
// to reduce amount of IR that will have to be duplicated. However,
// do not perform speculative hoisting the first time as LICM
// will destroy metadata that may not need to be destroyed if run
// after loop rotation.
// TODO: Investigate promotion cap for O1.
MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap,
/*AllowSpeculation=*/false));
// Rotate Loop - disable header duplication at -Oz
MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1, false));
// TODO: Investigate promotion cap for O1.
MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap,
/*AllowSpeculation=*/true));
MPM.add(createSimpleLoopUnswitchLegacyPass(OptLevel == 3));
// FIXME: We break the loop pass pipeline here in order to do full
// simplifycfg. Eventually loop-simplifycfg should be enhanced to replace the
// need for this.
MPM.add(createCFGSimplificationPass(
SimplifyCFGOptions().convertSwitchRangeToICmp(true)));
MPM.add(createInstructionCombiningPass());
// We resume loop passes creating a second loop pipeline here.
if (EnableLoopFlatten) {
MPM.add(createLoopFlattenPass()); // Flatten loops
MPM.add(createLoopSimplifyCFGPass());
}
MPM.add(createLoopIdiomPass()); // Recognize idioms like memset.
MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars
addExtensionsToPM(EP_LateLoopOptimizations, MPM);
MPM.add(createLoopDeletionPass()); // Delete dead loops
if (EnableLoopInterchange)
MPM.add(createLoopInterchangePass()); // Interchange loops
// Unroll small loops and perform peeling.
MPM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops,
ForgetAllSCEVInLoopUnroll));
addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
// This ends the loop pass pipelines.
// Break up allocas that may now be splittable after loop unrolling.
MPM.add(createSROAPass());
if (OptLevel > 1) {
MPM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds
MPM.add(NewGVN ? createNewGVNPass()
: createGVNPass(DisableGVNLoadPRE)); // Remove redundancies
}
MPM.add(createSCCPPass()); // Constant prop with SCCP
if (EnableConstraintElimination)
MPM.add(createConstraintEliminationPass());
// Delete dead bit computations (instcombine runs after to fold away the dead
// computations, and then ADCE will run later to exploit any new DCE
// opportunities that creates).
MPM.add(createBitTrackingDCEPass()); // Delete dead bit computations
// Run instcombine after redundancy elimination to exploit opportunities
// opened up by them.
MPM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, MPM);
if (OptLevel > 1) {
if (EnableDFAJumpThreading && SizeLevel == 0)
MPM.add(createDFAJumpThreadingPass());
MPM.add(createJumpThreadingPass()); // Thread jumps
MPM.add(createCorrelatedValuePropagationPass());
}
MPM.add(createAggressiveDCEPass()); // Delete dead instructions
MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
// TODO: Investigate if this is too expensive at O1.
if (OptLevel > 1) {
MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap,
/*AllowSpeculation=*/true));
}
addExtensionsToPM(EP_ScalarOptimizerLate, MPM);
if (RerollLoops)
MPM.add(createLoopRerollPass());
// Merge & remove BBs and sink & hoist common instructions.
MPM.add(createCFGSimplificationPass(
SimplifyCFGOptions().hoistCommonInsts(true).sinkCommonInsts(true)));
// Clean up after everything.
MPM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, MPM);
}
/// FIXME: Should LTO cause any differences to this set of passes?
void PassManagerBuilder::addVectorPasses(legacy::PassManagerBase &PM,
bool IsFullLTO) {
PM.add(createLoopVectorizePass(!LoopsInterleaved, !LoopVectorize));
if (IsFullLTO) {
// The vectorizer may have significantly shortened a loop body; unroll
// again. Unroll small loops to hide loop backedge latency and saturate any
// parallel execution resources of an out-of-order processor. We also then
// need to clean up redundancies and loop invariant code.
// FIXME: It would be really good to use a loop-integrated instruction
// combiner for cleanup here so that the unrolling and LICM can be pipelined
// across the loop nests.
// We do UnrollAndJam in a separate LPM to ensure it happens before unroll
if (EnableUnrollAndJam && !DisableUnrollLoops)
PM.add(createLoopUnrollAndJamPass(OptLevel));
PM.add(createLoopUnrollPass(OptLevel, DisableUnrollLoops,
ForgetAllSCEVInLoopUnroll));
PM.add(createWarnMissedTransformationsPass());
}
if (!IsFullLTO) {
// Eliminate loads by forwarding stores from the previous iteration to loads
// of the current iteration.
PM.add(createLoopLoadEliminationPass());
}
// Cleanup after the loop optimization passes.
PM.add(createInstructionCombiningPass());
if (OptLevel > 1 && ExtraVectorizerPasses) {
// At higher optimization levels, try to clean up any runtime overlap and
// alignment checks inserted by the vectorizer. We want to track correlated
// runtime checks for two inner loops in the same outer loop, fold any
// common computations, hoist loop-invariant aspects out of any outer loop,
// and unswitch the runtime checks if possible. Once hoisted, we may have
// dead (or speculatable) control flows or more combining opportunities.
PM.add(createEarlyCSEPass());
PM.add(createCorrelatedValuePropagationPass());
PM.add(createInstructionCombiningPass());
PM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap,
/*AllowSpeculation=*/true));
PM.add(createSimpleLoopUnswitchLegacyPass());
PM.add(createCFGSimplificationPass(
SimplifyCFGOptions().convertSwitchRangeToICmp(true)));
PM.add(createInstructionCombiningPass());
}
// Now that we've formed fast to execute loop structures, we do further
// optimizations. These are run afterward as they might block doing complex
// analyses and transforms such as what are needed for loop vectorization.
// Cleanup after loop vectorization, etc. Simplification passes like CVP and
// GVN, loop transforms, and others have already run, so it's now better to
// convert to more optimized IR using more aggressive simplify CFG options.
// The extra sinking transform can create larger basic blocks, so do this
// before SLP vectorization.
PM.add(createCFGSimplificationPass(SimplifyCFGOptions()
.forwardSwitchCondToPhi(true)
.convertSwitchRangeToICmp(true)
.convertSwitchToLookupTable(true)
.needCanonicalLoops(false)
.hoistCommonInsts(true)
.sinkCommonInsts(true)));
if (IsFullLTO) {
PM.add(createSCCPPass()); // Propagate exposed constants
PM.add(createInstructionCombiningPass()); // Clean up again
PM.add(createBitTrackingDCEPass());
}
// Optimize parallel scalar instruction chains into SIMD instructions.
if (SLPVectorize) {
PM.add(createSLPVectorizerPass());
if (OptLevel > 1 && ExtraVectorizerPasses)
PM.add(createEarlyCSEPass());
}
// Enhance/cleanup vector code.
PM.add(createVectorCombinePass());
if (!IsFullLTO) {
addExtensionsToPM(EP_Peephole, PM);
PM.add(createInstructionCombiningPass());
if (EnableUnrollAndJam && !DisableUnrollLoops) {
// Unroll and Jam. We do this before unroll but need to be in a separate
// loop pass manager in order for the outer loop to be processed by
// unroll and jam before the inner loop is unrolled.
PM.add(createLoopUnrollAndJamPass(OptLevel));
}
// Unroll small loops
PM.add(createLoopUnrollPass(OptLevel, DisableUnrollLoops,
ForgetAllSCEVInLoopUnroll));
if (!DisableUnrollLoops) {
// LoopUnroll may generate some redundency to cleanup.
PM.add(createInstructionCombiningPass());
// Runtime unrolling will introduce runtime check in loop prologue. If the
// unrolled loop is a inner loop, then the prologue will be inside the
// outer loop. LICM pass can help to promote the runtime check out if the
// checked value is loop invariant.
PM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap,
/*AllowSpeculation=*/true));
}
PM.add(createWarnMissedTransformationsPass());
}
// After vectorization and unrolling, assume intrinsics may tell us more
// about pointer alignments.
PM.add(createAlignmentFromAssumptionsPass());
if (IsFullLTO)
PM.add(createInstructionCombiningPass());
}
void PassManagerBuilder::populateModulePassManager(
legacy::PassManagerBase &MPM) {
MPM.add(createAnnotation2MetadataLegacyPass());
// Allow forcing function attributes as a debugging and tuning aid.
MPM.add(createForceFunctionAttrsLegacyPass());
// If all optimizations are disabled, just run the always-inline pass and,
// if enabled, the function merging pass.
if (OptLevel == 0) {
if (Inliner) {
MPM.add(Inliner);
Inliner = nullptr;
}
// FIXME: The BarrierNoopPass is a HACK! The inliner pass above implicitly
// creates a CGSCC pass manager, but we don't want to add extensions into
// that pass manager. To prevent this we insert a no-op module pass to reset
// the pass manager to get the same behavior as EP_OptimizerLast in non-O0
// builds. The function merging pass is
if (MergeFunctions)
MPM.add(createMergeFunctionsPass());
else if (GlobalExtensionsNotEmpty() || !Extensions.empty())
MPM.add(createBarrierNoopPass());
addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
MPM.add(createAnnotationRemarksLegacyPass());
return;
}
// Add LibraryInfo if we have some.
if (LibraryInfo)
MPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo));
addInitialAliasAnalysisPasses(MPM);
// Infer attributes about declarations if possible.
MPM.add(createInferFunctionAttrsLegacyPass());
// Infer attributes on declarations, call sites, arguments, etc.
if (AttributorRun & AttributorRunOption::MODULE)
MPM.add(createAttributorLegacyPass());
addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);
if (OptLevel > 2)
MPM.add(createCallSiteSplittingPass());
// Propage constant function arguments by specializing the functions.
if (OptLevel > 2 && EnableFunctionSpecialization)
MPM.add(createFunctionSpecializationPass());
MPM.add(createIPSCCPPass()); // IP SCCP
MPM.add(createCalledValuePropagationPass());
MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
// Promote any localized global vars.
MPM.add(createPromoteMemoryToRegisterPass());
MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
MPM.add(createInstructionCombiningPass()); // Clean up after IPCP & DAE
addExtensionsToPM(EP_Peephole, MPM);
MPM.add(
createCFGSimplificationPass(SimplifyCFGOptions().convertSwitchRangeToICmp(
true))); // Clean up after IPCP & DAE
// We add a module alias analysis pass here. In part due to bugs in the
// analysis infrastructure this "works" in that the analysis stays alive
// for the entire SCC pass run below.
MPM.add(createGlobalsAAWrapperPass());
// Start of CallGraph SCC passes.
bool RunInliner = false;
if (Inliner) {
MPM.add(Inliner);
Inliner = nullptr;
RunInliner = true;
}
// Infer attributes on declarations, call sites, arguments, etc. for an SCC.
if (AttributorRun & AttributorRunOption::CGSCC)
MPM.add(createAttributorCGSCCLegacyPass());
// Try to perform OpenMP specific optimizations. This is a (quick!) no-op if
// there are no OpenMP runtime calls present in the module.
if (OptLevel > 1)
MPM.add(createOpenMPOptCGSCCLegacyPass());
MPM.add(createPostOrderFunctionAttrsLegacyPass());
addExtensionsToPM(EP_CGSCCOptimizerLate, MPM);
addFunctionSimplificationPasses(MPM);
// FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC
// pass manager that we are specifically trying to avoid. To prevent this
// we must insert a no-op module pass to reset the pass manager.
MPM.add(createBarrierNoopPass());
if (RunPartialInlining)
MPM.add(createPartialInliningPass());
if (OptLevel > 1)
// Remove avail extern fns and globals definitions if we aren't
// compiling an object file for later LTO. For LTO we want to preserve
// these so they are eligible for inlining at link-time. Note if they
// are unreferenced they will be removed by GlobalDCE later, so
// this only impacts referenced available externally globals.
// Eventually they will be suppressed during codegen, but eliminating
// here enables more opportunity for GlobalDCE as it may make
// globals referenced by available external functions dead
// and saves running remaining passes on the eliminated functions.
MPM.add(createEliminateAvailableExternallyPass());
MPM.add(createReversePostOrderFunctionAttrsPass());
// The inliner performs some kind of dead code elimination as it goes,
// but there are cases that are not really caught by it. We might
// at some point consider teaching the inliner about them, but it
// is OK for now to run GlobalOpt + GlobalDCE in tandem as their
// benefits generally outweight the cost, making the whole pipeline
// faster.
if (RunInliner) {
MPM.add(createGlobalOptimizerPass());
MPM.add(createGlobalDCEPass());
}
// Scheduling LoopVersioningLICM when inlining is over, because after that
// we may see more accurate aliasing. Reason to run this late is that too
// early versioning may prevent further inlining due to increase of code
// size. By placing it just after inlining other optimizations which runs
// later might get benefit of no-alias assumption in clone loop.
if (UseLoopVersioningLICM) {
MPM.add(createLoopVersioningLICMPass()); // Do LoopVersioningLICM
MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap,
/*AllowSpeculation=*/true));
}
// We add a fresh GlobalsModRef run at this point. This is particularly
// useful as the above will have inlined, DCE'ed, and function-attr
// propagated everything. We should at this point have a reasonably minimal
// and richly annotated call graph. By computing aliasing and mod/ref
// information for all local globals here, the late loop passes and notably
// the vectorizer will be able to use them to help recognize vectorizable
// memory operations.
//
// Note that this relies on a bug in the pass manager which preserves
// a module analysis into a function pass pipeline (and throughout it) so
// long as the first function pass doesn't invalidate the module analysis.
// Thus both Float2Int and LoopRotate have to preserve AliasAnalysis for
// this to work. Fortunately, it is trivial to preserve AliasAnalysis
// (doing nothing preserves it as it is required to be conservatively
// correct in the face of IR changes).
MPM.add(createGlobalsAAWrapperPass());
MPM.add(createFloat2IntPass());
MPM.add(createLowerConstantIntrinsicsPass());
if (EnableMatrix) {
MPM.add(createLowerMatrixIntrinsicsPass());
// CSE the pointer arithmetic of the column vectors. This allows alias
// analysis to establish no-aliasing between loads and stores of different
// columns of the same matrix.
MPM.add(createEarlyCSEPass(false));
}
addExtensionsToPM(EP_VectorizerStart, MPM);
// Re-rotate loops in all our loop nests. These may have fallout out of
// rotated form due to GVN or other transformations, and the vectorizer relies
// on the rotated form. Disable header duplication at -Oz.
MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1, false));
// Distribute loops to allow partial vectorization. I.e. isolate dependences
// into separate loop that would otherwise inhibit vectorization. This is
// currently only performed for loops marked with the metadata
// llvm.loop.distribute=true or when -enable-loop-distribute is specified.
MPM.add(createLoopDistributePass());
addVectorPasses(MPM, /* IsFullLTO */ false);
// FIXME: We shouldn't bother with this anymore.
MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
// GlobalOpt already deletes dead functions and globals, at -O2 try a
// late pass of GlobalDCE. It is capable of deleting dead cycles.
if (OptLevel > 1) {
MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
MPM.add(createConstantMergePass()); // Merge dup global constants
}
// See comment in the new PM for justification of scheduling splitting at
// this stage (\ref buildModuleSimplificationPipeline).
if (EnableHotColdSplit)
MPM.add(createHotColdSplittingPass());
if (EnableIROutliner)
MPM.add(createIROutlinerPass());
if (MergeFunctions)
MPM.add(createMergeFunctionsPass());
// LoopSink pass sinks instructions hoisted by LICM, which serves as a
// canonicalization pass that enables other optimizations. As a result,
// LoopSink pass needs to be a very late IR pass to avoid undoing LICM
// result too early.
MPM.add(createLoopSinkPass());
// Get rid of LCSSA nodes.
MPM.add(createInstSimplifyLegacyPass());
// This hoists/decomposes div/rem ops. It should run after other sink/hoist
// passes to avoid re-sinking, but before SimplifyCFG because it can allow
// flattening of blocks.
MPM.add(createDivRemPairsPass());
// LoopSink (and other loop passes since the last simplifyCFG) might have
// resulted in single-entry-single-exit or empty blocks. Clean up the CFG.
MPM.add(createCFGSimplificationPass(
SimplifyCFGOptions().convertSwitchRangeToICmp(true)));
addExtensionsToPM(EP_OptimizerLast, MPM);
MPM.add(createAnnotationRemarksLegacyPass());
}
LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate() {
PassManagerBuilder *PMB = new PassManagerBuilder();
return wrap(PMB);
}
void LLVMPassManagerBuilderDispose(LLVMPassManagerBuilderRef PMB) {
PassManagerBuilder *Builder = unwrap(PMB);
delete Builder;
}
void
LLVMPassManagerBuilderSetOptLevel(LLVMPassManagerBuilderRef PMB,
unsigned OptLevel) {
PassManagerBuilder *Builder = unwrap(PMB);
Builder->OptLevel = OptLevel;
}
void
LLVMPassManagerBuilderSetSizeLevel(LLVMPassManagerBuilderRef PMB,
unsigned SizeLevel) {
PassManagerBuilder *Builder = unwrap(PMB);
Builder->SizeLevel = SizeLevel;
}
void
LLVMPassManagerBuilderSetDisableUnitAtATime(LLVMPassManagerBuilderRef PMB,
LLVMBool Value) {
// NOTE: The DisableUnitAtATime switch has been removed.
}
void
LLVMPassManagerBuilderSetDisableUnrollLoops(LLVMPassManagerBuilderRef PMB,
LLVMBool Value) {
PassManagerBuilder *Builder = unwrap(PMB);
Builder->DisableUnrollLoops = Value;
}
void
LLVMPassManagerBuilderSetDisableSimplifyLibCalls(LLVMPassManagerBuilderRef PMB,
LLVMBool Value) {
// NOTE: The simplify-libcalls pass has been removed.
}
void
LLVMPassManagerBuilderUseInlinerWithThreshold(LLVMPassManagerBuilderRef PMB,
unsigned Threshold) {
PassManagerBuilder *Builder = unwrap(PMB);
Builder->Inliner = createFunctionInliningPass(Threshold);
}
void
LLVMPassManagerBuilderPopulateFunctionPassManager(LLVMPassManagerBuilderRef PMB,
LLVMPassManagerRef PM) {
PassManagerBuilder *Builder = unwrap(PMB);
legacy::FunctionPassManager *FPM = unwrap<legacy::FunctionPassManager>(PM);
Builder->populateFunctionPassManager(*FPM);
}
void
LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
LLVMPassManagerRef PM) {
PassManagerBuilder *Builder = unwrap(PMB);
legacy::PassManagerBase *MPM = unwrap(PM);
Builder->populateModulePassManager(*MPM);
}
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