1 //===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the PassManagerBuilder class, which is used to set up a
11 // "standard" optimization sequence suitable for languages like C and C++.
13 //===----------------------------------------------------------------------===//
16 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
18 #include "llvm-c/Transforms/PassManagerBuilder.h"
20 #include "llvm/PassManager.h"
21 #include "llvm/DefaultPasses.h"
22 #include "llvm/PassManager.h"
23 #include "llvm/Analysis/Passes.h"
24 #include "llvm/Target/TargetLibraryInfo.h"
25 #include "llvm/Transforms/Scalar.h"
26 #include "llvm/Transforms/IPO.h"
27 #include "llvm/ADT/SmallVector.h"
28 #include "llvm/Support/ManagedStatic.h"
32 PassManagerBuilder::PassManagerBuilder() {
37 DisableSimplifyLibCalls = false;
38 DisableUnitAtATime = false;
39 DisableUnrollLoops = false;
42 PassManagerBuilder::~PassManagerBuilder() {
47 /// Set of global extensions, automatically added as part of the standard set.
48 static ManagedStatic<SmallVector<std::pair<PassManagerBuilder::ExtensionPointTy,
49 PassManagerBuilder::ExtensionFn>, 8> > GlobalExtensions;
51 void PassManagerBuilder::addGlobalExtension(
52 PassManagerBuilder::ExtensionPointTy Ty,
53 PassManagerBuilder::ExtensionFn Fn) {
54 GlobalExtensions->push_back(std::make_pair(Ty, Fn));
57 void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
58 Extensions.push_back(std::make_pair(Ty, Fn));
61 void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy,
62 PassManagerBase &PM) const {
63 for (unsigned i = 0, e = GlobalExtensions->size(); i != e; ++i)
64 if ((*GlobalExtensions)[i].first == ETy)
65 (*GlobalExtensions)[i].second(*this, PM);
66 for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
67 if (Extensions[i].first == ETy)
68 Extensions[i].second(*this, PM);
72 PassManagerBuilder::addInitialAliasAnalysisPasses(PassManagerBase &PM) const {
73 // Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
74 // BasicAliasAnalysis wins if they disagree. This is intended to help
75 // support "obvious" type-punning idioms.
76 PM.add(createTypeBasedAliasAnalysisPass());
77 PM.add(createBasicAliasAnalysisPass());
80 void PassManagerBuilder::populateFunctionPassManager(FunctionPassManager &FPM) {
81 addExtensionsToPM(EP_EarlyAsPossible, FPM);
83 // Add LibraryInfo if we have some.
84 if (LibraryInfo) FPM.add(new TargetLibraryInfo(*LibraryInfo));
86 if (OptLevel == 0) return;
88 addInitialAliasAnalysisPasses(FPM);
90 FPM.add(createCFGSimplificationPass());
91 FPM.add(createScalarReplAggregatesPass());
92 FPM.add(createEarlyCSEPass());
93 FPM.add(createLowerExpectIntrinsicPass());
96 void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
97 // If all optimizations are disabled, just run the always-inline pass.
103 addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
107 // Add LibraryInfo if we have some.
108 if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));
110 addInitialAliasAnalysisPasses(MPM);
112 if (!DisableUnitAtATime) {
113 MPM.add(createGlobalOptimizerPass()); // Optimize out global vars
115 MPM.add(createIPSCCPPass()); // IP SCCP
116 MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
118 MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
119 MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
122 // Start of CallGraph SCC passes.
123 if (!DisableUnitAtATime)
124 MPM.add(createPruneEHPass()); // Remove dead EH info
129 if (!DisableUnitAtATime)
130 MPM.add(createFunctionAttrsPass()); // Set readonly/readnone attrs
132 MPM.add(createArgumentPromotionPass()); // Scalarize uninlined fn args
134 // Start of function pass.
135 // Break up aggregate allocas, using SSAUpdater.
136 MPM.add(createScalarReplAggregatesPass(-1, false));
137 MPM.add(createEarlyCSEPass()); // Catch trivial redundancies
138 if (!DisableSimplifyLibCalls)
139 MPM.add(createSimplifyLibCallsPass()); // Library Call Optimizations
140 MPM.add(createJumpThreadingPass()); // Thread jumps.
141 MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
142 MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
143 MPM.add(createInstructionCombiningPass()); // Combine silly seq's
145 MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
146 MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
147 MPM.add(createReassociatePass()); // Reassociate expressions
148 MPM.add(createLoopRotatePass()); // Rotate Loop
149 MPM.add(createLICMPass()); // Hoist loop invariants
150 MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
151 MPM.add(createInstructionCombiningPass());
152 MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars
153 MPM.add(createLoopIdiomPass()); // Recognize idioms like memset.
154 MPM.add(createLoopDeletionPass()); // Delete dead loops
155 if (!DisableUnrollLoops)
156 MPM.add(createLoopUnrollPass()); // Unroll small loops
157 addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
160 MPM.add(createGVNPass()); // Remove redundancies
161 MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
162 MPM.add(createSCCPPass()); // Constant prop with SCCP
164 // Run instcombine after redundancy elimination to exploit opportunities
165 // opened up by them.
166 MPM.add(createInstructionCombiningPass());
167 MPM.add(createJumpThreadingPass()); // Thread jumps
168 MPM.add(createCorrelatedValuePropagationPass());
169 MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
171 addExtensionsToPM(EP_ScalarOptimizerLate, MPM);
173 MPM.add(createAggressiveDCEPass()); // Delete dead instructions
174 MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
175 MPM.add(createInstructionCombiningPass()); // Clean up after everything.
177 if (!DisableUnitAtATime) {
178 // FIXME: We shouldn't bother with this anymore.
179 MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
181 // GlobalOpt already deletes dead functions and globals, at -O3 try a
182 // late pass of GlobalDCE. It is capable of deleting dead cycles.
184 MPM.add(createGlobalDCEPass()); // Remove dead fns and globals.
187 MPM.add(createConstantMergePass()); // Merge dup global constants
191 void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
194 // Provide AliasAnalysis services for optimizations.
195 addInitialAliasAnalysisPasses(PM);
197 // Now that composite has been compiled, scan through the module, looking
198 // for a main function. If main is defined, mark all other functions
201 PM.add(createInternalizePass(true));
203 // Propagate constants at call sites into the functions they call. This
204 // opens opportunities for globalopt (and inlining) by substituting function
205 // pointers passed as arguments to direct uses of functions.
206 PM.add(createIPSCCPPass());
208 // Now that we internalized some globals, see if we can hack on them!
209 PM.add(createGlobalOptimizerPass());
211 // Linking modules together can lead to duplicated global constants, only
212 // keep one copy of each constant.
213 PM.add(createConstantMergePass());
215 // Remove unused arguments from functions.
216 PM.add(createDeadArgEliminationPass());
218 // Reduce the code after globalopt and ipsccp. Both can open up significant
219 // simplification opportunities, and both can propagate functions through
220 // function pointers. When this happens, we often have to resolve varargs
221 // calls, etc, so let instcombine do this.
222 PM.add(createInstructionCombiningPass());
224 // Inline small functions
226 PM.add(createFunctionInliningPass());
228 PM.add(createPruneEHPass()); // Remove dead EH info.
230 // Optimize globals again if we ran the inliner.
232 PM.add(createGlobalOptimizerPass());
233 PM.add(createGlobalDCEPass()); // Remove dead functions.
235 // If we didn't decide to inline a function, check to see if we can
236 // transform it to pass arguments by value instead of by reference.
237 PM.add(createArgumentPromotionPass());
239 // The IPO passes may leave cruft around. Clean up after them.
240 PM.add(createInstructionCombiningPass());
241 PM.add(createJumpThreadingPass());
243 PM.add(createScalarReplAggregatesPass());
245 // Run a few AA driven optimizations here and now, to cleanup the code.
246 PM.add(createFunctionAttrsPass()); // Add nocapture.
247 PM.add(createGlobalsModRefPass()); // IP alias analysis.
249 PM.add(createLICMPass()); // Hoist loop invariants.
250 PM.add(createGVNPass()); // Remove redundancies.
251 PM.add(createMemCpyOptPass()); // Remove dead memcpys.
253 PM.add(createDeadStoreEliminationPass());
255 // Cleanup and simplify the code after the scalar optimizations.
256 PM.add(createInstructionCombiningPass());
258 PM.add(createJumpThreadingPass());
260 // Delete basic blocks, which optimization passes may have killed.
261 PM.add(createCFGSimplificationPass());
263 // Now that we have optimized the program, discard unreachable functions.
264 PM.add(createGlobalDCEPass());
267 LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate(void) {
268 PassManagerBuilder *PMB = new PassManagerBuilder();
272 void LLVMPassManagerBuilderDispose(LLVMPassManagerBuilderRef PMB) {
273 PassManagerBuilder *Builder = unwrap(PMB);
278 LLVMPassManagerBuilderSetOptLevel(LLVMPassManagerBuilderRef PMB,
280 PassManagerBuilder *Builder = unwrap(PMB);
281 Builder->OptLevel = OptLevel;
285 LLVMPassManagerBuilderSetSizeLevel(LLVMPassManagerBuilderRef PMB,
286 unsigned SizeLevel) {
287 PassManagerBuilder *Builder = unwrap(PMB);
288 Builder->SizeLevel = SizeLevel;
292 LLVMPassManagerBuilderSetDisableUnitAtATime(LLVMPassManagerBuilderRef PMB,
294 PassManagerBuilder *Builder = unwrap(PMB);
295 Builder->DisableUnitAtATime = Value;
299 LLVMPassManagerBuilderSetDisableUnrollLoops(LLVMPassManagerBuilderRef PMB,
301 PassManagerBuilder *Builder = unwrap(PMB);
302 Builder->DisableUnrollLoops = Value;
306 LLVMPassManagerBuilderSetDisableSimplifyLibCalls(LLVMPassManagerBuilderRef PMB,
308 PassManagerBuilder *Builder = unwrap(PMB);
309 Builder->DisableSimplifyLibCalls = Value;
313 LLVMPassManagerBuilderUseInlinerWithThreshold(LLVMPassManagerBuilderRef PMB,
314 unsigned Threshold) {
315 PassManagerBuilder *Builder = unwrap(PMB);
316 Builder->Inliner = createFunctionInliningPass(Threshold);
320 LLVMPassManagerBuilderPopulateFunctionPassManager(LLVMPassManagerBuilderRef PMB,
321 LLVMPassManagerRef PM) {
322 PassManagerBuilder *Builder = unwrap(PMB);
323 FunctionPassManager *FPM = unwrap<FunctionPassManager>(PM);
324 Builder->populateFunctionPassManager(*FPM);
328 LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
329 LLVMPassManagerRef PM) {
330 PassManagerBuilder *Builder = unwrap(PMB);
331 PassManagerBase *MPM = unwrap(PM);
332 Builder->populateModulePassManager(*MPM);
335 void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
336 LLVMPassManagerRef PM,
339 PassManagerBuilder *Builder = unwrap(PMB);
340 PassManagerBase *LPM = unwrap(PM);
341 Builder->populateLTOPassManager(*LPM, Internalize, RunInliner);