summaryrefslogtreecommitdiff
path: root/lib/Transforms/IPO/PassManagerBuilder.cpp
blob: 97698caa516aca71c8f6223a978d3b27381a9533 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
//===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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/PassManager.h"
#include "llvm/DefaultPasses.h"
#include "llvm/PassManager.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/Verifier.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Transforms/Vectorize.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/ManagedStatic.h"

using namespace llvm;

static cl::opt<bool>
RunVectorization("vectorize", cl::desc("Run vectorization passes"));

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"));

static cl::opt<bool> UseNewSROA("use-new-sroa",
  cl::init(true), cl::Hidden,
  cl::desc("Enable the new, experimental SROA pass"));

PassManagerBuilder::PassManagerBuilder() {
    OptLevel = 2;
    SizeLevel = 0;
    LibraryInfo = 0;
    Inliner = 0;
    DisableSimplifyLibCalls = false;
    DisableUnitAtATime = false;
    DisableUnrollLoops = false;
    Vectorize = RunVectorization;
}

PassManagerBuilder::~PassManagerBuilder() {
  delete LibraryInfo;
  delete Inliner;
}

/// Set of global extensions, automatically added as part of the standard set.
static ManagedStatic<SmallVector<std::pair<PassManagerBuilder::ExtensionPointTy,
   PassManagerBuilder::ExtensionFn>, 8> > GlobalExtensions;

void PassManagerBuilder::addGlobalExtension(
    PassManagerBuilder::ExtensionPointTy Ty,
    PassManagerBuilder::ExtensionFn Fn) {
  GlobalExtensions->push_back(std::make_pair(Ty, Fn));
}

void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
  Extensions.push_back(std::make_pair(Ty, Fn));
}

void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy,
                                           PassManagerBase &PM) const {
  for (unsigned i = 0, e = GlobalExtensions->size(); i != e; ++i)
    if ((*GlobalExtensions)[i].first == ETy)
      (*GlobalExtensions)[i].second(*this, PM);
  for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
    if (Extensions[i].first == ETy)
      Extensions[i].second(*this, PM);
}

void
PassManagerBuilder::addInitialAliasAnalysisPasses(PassManagerBase &PM) const {
  // 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());
}

void PassManagerBuilder::populateFunctionPassManager(FunctionPassManager &FPM) {
  addExtensionsToPM(EP_EarlyAsPossible, FPM);

  // Add LibraryInfo if we have some.
  if (LibraryInfo) FPM.add(new TargetLibraryInfo(*LibraryInfo));

  if (OptLevel == 0) return;

  addInitialAliasAnalysisPasses(FPM);

  FPM.add(createCFGSimplificationPass());
  if (UseNewSROA)
    FPM.add(createSROAPass());
  else
    FPM.add(createScalarReplAggregatesPass());
  FPM.add(createEarlyCSEPass());
  FPM.add(createLowerExpectIntrinsicPass());
}

void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
  // If all optimizations are disabled, just run the always-inline pass.
  if (OptLevel == 0) {
    if (Inliner) {
      MPM.add(Inliner);
      Inliner = 0;
    }
    addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
    return;
  }

  // Add LibraryInfo if we have some.
  if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));

  addInitialAliasAnalysisPasses(MPM);

  if (!DisableUnitAtATime) {
    addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);

    MPM.add(createGlobalOptimizerPass());     // Optimize out global vars

    MPM.add(createIPSCCPPass());              // IP SCCP
    MPM.add(createDeadArgEliminationPass());  // Dead argument elimination

    MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
    MPM.add(createCFGSimplificationPass());   // Clean up after IPCP & DAE
  }

  // Start of CallGraph SCC passes.
  if (!DisableUnitAtATime)
    MPM.add(createPruneEHPass());             // Remove dead EH info
  if (Inliner) {
    MPM.add(Inliner);
    Inliner = 0;
  }
  if (!DisableUnitAtATime)
    MPM.add(createFunctionAttrsPass());       // Set readonly/readnone attrs
  if (OptLevel > 2)
    MPM.add(createArgumentPromotionPass());   // Scalarize uninlined fn args

  // Start of function pass.
  // Break up aggregate allocas, using SSAUpdater.
  if (UseNewSROA)
    MPM.add(createSROAPass(/*RequiresDomTree*/ false));
  else
    MPM.add(createScalarReplAggregatesPass(-1, false));
  MPM.add(createEarlyCSEPass());              // Catch trivial redundancies
  if (!DisableSimplifyLibCalls)
    MPM.add(createSimplifyLibCallsPass());    // Library Call Optimizations
  MPM.add(createJumpThreadingPass());         // Thread jumps.
  MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
  MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
  MPM.add(createInstructionCombiningPass());  // Combine silly seq's

  MPM.add(createTailCallEliminationPass());   // Eliminate tail calls
  MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
  MPM.add(createReassociatePass());           // Reassociate expressions
  MPM.add(createLoopRotatePass());            // Rotate Loop
  MPM.add(createLICMPass());                  // Hoist loop invariants
  MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
  MPM.add(createInstructionCombiningPass());
  MPM.add(createIndVarSimplifyPass());        // Canonicalize indvars
  MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
  MPM.add(createLoopDeletionPass());          // Delete dead loops

  if (Vectorize) {
    MPM.add(createLoopVectorizePass());
    MPM.add(createLICMPass());
  }

  if (!DisableUnrollLoops)
    MPM.add(createLoopUnrollPass());          // Unroll small loops
  addExtensionsToPM(EP_LoopOptimizerEnd, MPM);

  if (OptLevel > 1)
    MPM.add(createGVNPass());                 // Remove redundancies
  MPM.add(createMemCpyOptPass());             // Remove memcpy / form memset
  MPM.add(createSCCPPass());                  // Constant prop with SCCP

  // Run instcombine after redundancy elimination to exploit opportunities
  // opened up by them.
  MPM.add(createInstructionCombiningPass());
  MPM.add(createJumpThreadingPass());         // Thread jumps
  MPM.add(createCorrelatedValuePropagationPass());
  MPM.add(createDeadStoreEliminationPass());  // Delete dead stores

  addExtensionsToPM(EP_ScalarOptimizerLate, MPM);

  if (Vectorize) {
    MPM.add(createBBVectorizePass());
    MPM.add(createInstructionCombiningPass());
    if (OptLevel > 1 && UseGVNAfterVectorization)
      MPM.add(createGVNPass());                   // Remove redundancies
    else
      MPM.add(createEarlyCSEPass());              // Catch trivial redundancies
  }

  MPM.add(createAggressiveDCEPass());         // Delete dead instructions
  MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
  MPM.add(createInstructionCombiningPass());  // Clean up after everything.

  if (!DisableUnitAtATime) {
    // 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
    }
  }
  addExtensionsToPM(EP_OptimizerLast, MPM);
}

void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
                                                bool Internalize,
                                                bool RunInliner,
                                                bool DisableGVNLoadPRE) {
  // Provide AliasAnalysis services for optimizations.
  addInitialAliasAnalysisPasses(PM);

  // Now that composite has been compiled, scan through the module, looking
  // for a main function.  If main is defined, mark all other functions
  // internal.
  if (Internalize)
    PM.add(createInternalizePass(true));

  // Propagate constants at call sites into the functions they call.  This
  // opens opportunities for globalopt (and inlining) by substituting function
  // pointers passed as arguments to direct uses of functions.
  PM.add(createIPSCCPPass());

  // Now that we internalized some globals, see if we can hack on them!
  PM.add(createGlobalOptimizerPass());

  // Linking modules together can lead to duplicated global constants, only
  // keep one copy of each constant.
  PM.add(createConstantMergePass());

  // Remove unused arguments from functions.
  PM.add(createDeadArgEliminationPass());

  // Reduce the code after globalopt and ipsccp.  Both can open up significant
  // simplification opportunities, and both can propagate functions through
  // function pointers.  When this happens, we often have to resolve varargs
  // calls, etc, so let instcombine do this.
  PM.add(createInstructionCombiningPass());

  // Inline small functions
  if (RunInliner)
    PM.add(createFunctionInliningPass());

  PM.add(createPruneEHPass());   // Remove dead EH info.

  // Optimize globals again if we ran the inliner.
  if (RunInliner)
    PM.add(createGlobalOptimizerPass());
  PM.add(createGlobalDCEPass()); // Remove dead functions.

  // If we didn't decide to inline a function, check to see if we can
  // transform it to pass arguments by value instead of by reference.
  PM.add(createArgumentPromotionPass());

  // The IPO passes may leave cruft around.  Clean up after them.
  PM.add(createInstructionCombiningPass());
  PM.add(createJumpThreadingPass());
  // Break up allocas
  if (UseNewSROA)
    PM.add(createSROAPass());
  else
    PM.add(createScalarReplAggregatesPass());

  // Run a few AA driven optimizations here and now, to cleanup the code.
  PM.add(createFunctionAttrsPass()); // Add nocapture.
  PM.add(createGlobalsModRefPass()); // IP alias analysis.

  PM.add(createLICMPass());                 // Hoist loop invariants.
  PM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies.
  PM.add(createMemCpyOptPass());            // Remove dead memcpys.
  // Nuke dead stores.
  PM.add(createDeadStoreEliminationPass());

  // Cleanup and simplify the code after the scalar optimizations.
  PM.add(createInstructionCombiningPass());

  PM.add(createJumpThreadingPass());

  // Delete basic blocks, which optimization passes may have killed.
  PM.add(createCFGSimplificationPass());

  // Now that we have optimized the program, discard unreachable functions.
  PM.add(createGlobalDCEPass());
}

LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate(void) {
  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) {
  PassManagerBuilder *Builder = unwrap(PMB);
  Builder->DisableUnitAtATime = Value;
}

void
LLVMPassManagerBuilderSetDisableUnrollLoops(LLVMPassManagerBuilderRef PMB,
                                            LLVMBool Value) {
  PassManagerBuilder *Builder = unwrap(PMB);
  Builder->DisableUnrollLoops = Value;
}

void
LLVMPassManagerBuilderSetDisableSimplifyLibCalls(LLVMPassManagerBuilderRef PMB,
                                                 LLVMBool Value) {
  PassManagerBuilder *Builder = unwrap(PMB);
  Builder->DisableSimplifyLibCalls = Value;
}

void
LLVMPassManagerBuilderUseInlinerWithThreshold(LLVMPassManagerBuilderRef PMB,
                                              unsigned Threshold) {
  PassManagerBuilder *Builder = unwrap(PMB);
  Builder->Inliner = createFunctionInliningPass(Threshold);
}

void
LLVMPassManagerBuilderPopulateFunctionPassManager(LLVMPassManagerBuilderRef PMB,
                                                  LLVMPassManagerRef PM) {
  PassManagerBuilder *Builder = unwrap(PMB);
  FunctionPassManager *FPM = unwrap<FunctionPassManager>(PM);
  Builder->populateFunctionPassManager(*FPM);
}

void
LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
                                                LLVMPassManagerRef PM) {
  PassManagerBuilder *Builder = unwrap(PMB);
  PassManagerBase *MPM = unwrap(PM);
  Builder->populateModulePassManager(*MPM);
}

void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
                                                  LLVMPassManagerRef PM,
                                                  bool Internalize,
                                                  bool RunInliner) {
  PassManagerBuilder *Builder = unwrap(PMB);
  PassManagerBase *LPM = unwrap(PM);
  Builder->populateLTOPassManager(*LPM, Internalize, RunInliner);
}