forked from OSchip/llvm-project
344 lines
12 KiB
C++
344 lines
12 KiB
C++
//===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the PassManagerBuilder class, which is used to set up a
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// "standard" optimization sequence suitable for languages like C and C++.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/IPO/PassManagerBuilder.h"
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#include "llvm-c/Transforms/PassManagerBuilder.h"
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#include "llvm/PassManager.h"
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#include "llvm/DefaultPasses.h"
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#include "llvm/PassManager.h"
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#include "llvm/Analysis/Passes.h"
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#include "llvm/Analysis/Verifier.h"
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#include "llvm/Target/TargetLibraryInfo.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/ManagedStatic.h"
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using namespace llvm;
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PassManagerBuilder::PassManagerBuilder() {
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OptLevel = 2;
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SizeLevel = 0;
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LibraryInfo = 0;
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Inliner = 0;
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DisableSimplifyLibCalls = false;
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DisableUnitAtATime = false;
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DisableUnrollLoops = false;
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}
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PassManagerBuilder::~PassManagerBuilder() {
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delete LibraryInfo;
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delete Inliner;
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}
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/// Set of global extensions, automatically added as part of the standard set.
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static ManagedStatic<SmallVector<std::pair<PassManagerBuilder::ExtensionPointTy,
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PassManagerBuilder::ExtensionFn>, 8> > GlobalExtensions;
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void PassManagerBuilder::addGlobalExtension(
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PassManagerBuilder::ExtensionPointTy Ty,
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PassManagerBuilder::ExtensionFn Fn) {
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GlobalExtensions->push_back(std::make_pair(Ty, Fn));
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}
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void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
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Extensions.push_back(std::make_pair(Ty, Fn));
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}
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void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy,
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PassManagerBase &PM) const {
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for (unsigned i = 0, e = GlobalExtensions->size(); i != e; ++i)
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if ((*GlobalExtensions)[i].first == ETy)
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(*GlobalExtensions)[i].second(*this, PM);
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for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
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if (Extensions[i].first == ETy)
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Extensions[i].second(*this, PM);
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}
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void
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PassManagerBuilder::addInitialAliasAnalysisPasses(PassManagerBase &PM) const {
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// Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
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// BasicAliasAnalysis wins if they disagree. This is intended to help
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// support "obvious" type-punning idioms.
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PM.add(createTypeBasedAliasAnalysisPass());
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PM.add(createBasicAliasAnalysisPass());
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}
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void PassManagerBuilder::populateFunctionPassManager(FunctionPassManager &FPM) {
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addExtensionsToPM(EP_EarlyAsPossible, FPM);
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// Add LibraryInfo if we have some.
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if (LibraryInfo) FPM.add(new TargetLibraryInfo(*LibraryInfo));
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if (OptLevel == 0) return;
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addInitialAliasAnalysisPasses(FPM);
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FPM.add(createCFGSimplificationPass());
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FPM.add(createScalarReplAggregatesPass());
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FPM.add(createEarlyCSEPass());
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FPM.add(createLowerExpectIntrinsicPass());
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}
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void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
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// If all optimizations are disabled, just run the always-inline pass.
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if (OptLevel == 0) {
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if (Inliner) {
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MPM.add(Inliner);
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Inliner = 0;
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}
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return;
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}
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// Add LibraryInfo if we have some.
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if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));
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addInitialAliasAnalysisPasses(MPM);
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if (!DisableUnitAtATime) {
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MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
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MPM.add(createIPSCCPPass()); // IP SCCP
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MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
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MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
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MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
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}
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// Start of CallGraph SCC passes.
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if (!DisableUnitAtATime)
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MPM.add(createPruneEHPass()); // Remove dead EH info
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if (Inliner) {
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MPM.add(Inliner);
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Inliner = 0;
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}
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if (!DisableUnitAtATime)
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MPM.add(createFunctionAttrsPass()); // Set readonly/readnone attrs
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if (OptLevel > 2)
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MPM.add(createArgumentPromotionPass()); // Scalarize uninlined fn args
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// Start of function pass.
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// Break up aggregate allocas, using SSAUpdater.
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MPM.add(createScalarReplAggregatesPass(-1, false));
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MPM.add(createEarlyCSEPass()); // Catch trivial redundancies
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if (!DisableSimplifyLibCalls)
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MPM.add(createSimplifyLibCallsPass()); // Library Call Optimizations
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MPM.add(createJumpThreadingPass()); // Thread jumps.
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MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createInstructionCombiningPass()); // Combine silly seq's
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MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createReassociatePass()); // Reassociate expressions
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MPM.add(createLoopRotatePass()); // Rotate Loop
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MPM.add(createLICMPass()); // Hoist loop invariants
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MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
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MPM.add(createInstructionCombiningPass());
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MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars
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MPM.add(createLoopIdiomPass()); // Recognize idioms like memset.
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MPM.add(createLoopDeletionPass()); // Delete dead loops
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if (!DisableUnrollLoops)
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MPM.add(createLoopUnrollPass()); // Unroll small loops
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addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
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if (OptLevel > 1)
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MPM.add(createGVNPass()); // Remove redundancies
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MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
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MPM.add(createSCCPPass()); // Constant prop with SCCP
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// Run instcombine after redundancy elimination to exploit opportunities
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// opened up by them.
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MPM.add(createInstructionCombiningPass());
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MPM.add(createJumpThreadingPass()); // Thread jumps
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MPM.add(createCorrelatedValuePropagationPass());
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MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
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addExtensionsToPM(EP_ScalarOptimizerLate, MPM);
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MPM.add(createAggressiveDCEPass()); // Delete dead instructions
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createInstructionCombiningPass()); // Clean up after everything.
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if (!DisableUnitAtATime) {
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// FIXME: We shouldn't bother with this anymore.
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MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
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// GlobalOpt already deletes dead functions and globals, at -O3 try a
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// late pass of GlobalDCE. It is capable of deleting dead cycles.
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if (OptLevel > 2)
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MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
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if (OptLevel > 1)
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MPM.add(createConstantMergePass()); // Merge dup global constants
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}
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}
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void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
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bool Internalize,
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bool RunInliner) {
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// Provide AliasAnalysis services for optimizations.
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addInitialAliasAnalysisPasses(PM);
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// Now that composite has been compiled, scan through the module, looking
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// for a main function. If main is defined, mark all other functions
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// internal.
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if (Internalize)
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PM.add(createInternalizePass(true));
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// Propagate constants at call sites into the functions they call. This
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// opens opportunities for globalopt (and inlining) by substituting function
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// pointers passed as arguments to direct uses of functions.
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PM.add(createIPSCCPPass());
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// Now that we internalized some globals, see if we can hack on them!
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PM.add(createGlobalOptimizerPass());
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// Linking modules together can lead to duplicated global constants, only
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// keep one copy of each constant.
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PM.add(createConstantMergePass());
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// Remove unused arguments from functions.
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PM.add(createDeadArgEliminationPass());
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// Reduce the code after globalopt and ipsccp. Both can open up significant
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// simplification opportunities, and both can propagate functions through
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// function pointers. When this happens, we often have to resolve varargs
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// calls, etc, so let instcombine do this.
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PM.add(createInstructionCombiningPass());
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// Inline small functions
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if (RunInliner)
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PM.add(createFunctionInliningPass());
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PM.add(createPruneEHPass()); // Remove dead EH info.
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// Optimize globals again if we ran the inliner.
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if (RunInliner)
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PM.add(createGlobalOptimizerPass());
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PM.add(createGlobalDCEPass()); // Remove dead functions.
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// If we didn't decide to inline a function, check to see if we can
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// transform it to pass arguments by value instead of by reference.
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PM.add(createArgumentPromotionPass());
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// The IPO passes may leave cruft around. Clean up after them.
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PM.add(createInstructionCombiningPass());
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PM.add(createJumpThreadingPass());
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// Break up allocas
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PM.add(createScalarReplAggregatesPass());
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// Run a few AA driven optimizations here and now, to cleanup the code.
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PM.add(createFunctionAttrsPass()); // Add nocapture.
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PM.add(createGlobalsModRefPass()); // IP alias analysis.
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PM.add(createLICMPass()); // Hoist loop invariants.
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PM.add(createGVNPass()); // Remove redundancies.
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PM.add(createMemCpyOptPass()); // Remove dead memcpys.
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// Nuke dead stores.
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PM.add(createDeadStoreEliminationPass());
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// Cleanup and simplify the code after the scalar optimizations.
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PM.add(createInstructionCombiningPass());
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PM.add(createJumpThreadingPass());
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// Delete basic blocks, which optimization passes may have killed.
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PM.add(createCFGSimplificationPass());
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// Now that we have optimized the program, discard unreachable functions.
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PM.add(createGlobalDCEPass());
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}
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LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate(void) {
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PassManagerBuilder *PMB = new PassManagerBuilder();
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return wrap(PMB);
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}
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void LLVMPassManagerBuilderDispose(LLVMPassManagerBuilderRef PMB) {
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PassManagerBuilder *Builder = unwrap(PMB);
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delete Builder;
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}
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void
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LLVMPassManagerBuilderSetOptLevel(LLVMPassManagerBuilderRef PMB,
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unsigned OptLevel) {
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PassManagerBuilder *Builder = unwrap(PMB);
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Builder->OptLevel = OptLevel;
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}
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void
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LLVMPassManagerBuilderSetSizeLevel(LLVMPassManagerBuilderRef PMB,
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unsigned SizeLevel) {
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PassManagerBuilder *Builder = unwrap(PMB);
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Builder->SizeLevel = SizeLevel;
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}
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void
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LLVMPassManagerBuilderSetDisableUnitAtATime(LLVMPassManagerBuilderRef PMB,
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LLVMBool Value) {
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PassManagerBuilder *Builder = unwrap(PMB);
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Builder->DisableUnitAtATime = Value;
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}
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void
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LLVMPassManagerBuilderSetDisableUnrollLoops(LLVMPassManagerBuilderRef PMB,
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LLVMBool Value) {
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PassManagerBuilder *Builder = unwrap(PMB);
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Builder->DisableUnrollLoops = Value;
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}
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void
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LLVMPassManagerBuilderSetDisableSimplifyLibCalls(LLVMPassManagerBuilderRef PMB,
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LLVMBool Value) {
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PassManagerBuilder *Builder = unwrap(PMB);
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Builder->DisableSimplifyLibCalls = Value;
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}
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void
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LLVMPassManagerBuilderUseInlinerWithThreshold(LLVMPassManagerBuilderRef PMB,
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unsigned Threshold) {
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PassManagerBuilder *Builder = unwrap(PMB);
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Builder->Inliner = createFunctionInliningPass(Threshold);
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}
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void
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LLVMPassManagerBuilderPopulateFunctionPassManager(LLVMPassManagerBuilderRef PMB,
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LLVMPassManagerRef PM) {
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PassManagerBuilder *Builder = unwrap(PMB);
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FunctionPassManager *FPM = unwrap<FunctionPassManager>(PM);
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Builder->populateFunctionPassManager(*FPM);
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}
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void
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LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
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LLVMPassManagerRef PM) {
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PassManagerBuilder *Builder = unwrap(PMB);
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PassManagerBase *MPM = unwrap(PM);
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Builder->populateModulePassManager(*MPM);
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}
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void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
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LLVMPassManagerRef PM,
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bool Internalize,
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bool RunInliner) {
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PassManagerBuilder *Builder = unwrap(PMB);
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PassManagerBase *LPM = unwrap(PM);
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Builder->populateLTOPassManager(*LPM, Internalize, RunInliner);
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}
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