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Remove the very substantial, largely unmaintained legacy PGO

Browse Source 
infrastructure.

This was essentially work toward PGO based on a design that had several
flaws, partially dating from a time when LLVM had a different
architecture, and with an effort to modernize it abandoned without being
completed. Since then, it has bitrotted for several years further. The
result is nearly unusable, and isn't helping any of the modern PGO
efforts. Instead, it is getting in the way, adding confusion about PGO
in LLVM and distracting everyone with maintenance on essentially dead
code. Removing it paves the way for modern efforts around PGO.

Among other effects, this removes the last of the runtime libraries from
LLVM. Those are being developed in the separate 'compiler-rt' project
now, with somewhat different licensing specifically more approriate for
runtimes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191835 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2013-10-02 15:42:23 +00:00
parent 6ffce6fa92
commit dd5d86d992
61 changed files with 12 additions and 8640 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
lib/Transforms/Instrumentation/CMakeLists.txt
View File

@@ -3,12 +3,9 @@ add_llvm_library(LLVMInstrumentation
BoundsChecking.cpp
DataFlowSanitizer.cpp
DebugIR.cpp
EdgeProfiling.cpp
GCOVProfiling.cpp
MemorySanitizer.cpp
Instrumentation.cpp
OptimalEdgeProfiling.cpp
PathProfiling.cpp
ProfilingUtils.cpp
ThreadSanitizer.cpp
)

117
lib/Transforms/Instrumentation/EdgeProfiling.cpp
View File

@@ -1,117 +0,0 @@
//===- EdgeProfiling.cpp - Insert counters for edge profiling -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass instruments the specified program with counters for edge profiling.
// Edge profiling can give a reasonable approximation of the hot paths through a
// program, and is used for a wide variety of program transformations.
//
// Note that this implementation is very naive. We insert a counter for *every*
// edge in the program, instead of using control flow information to prune the
// number of counters inserted.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "insert-edge-profiling"
#include "llvm/Transforms/Instrumentation.h"
#include "ProfilingUtils.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include <set>
using namespace llvm;
STATISTIC(NumEdgesInserted, "The # of edges inserted.");
namespace {
class EdgeProfiler : public ModulePass {
bool runOnModule(Module &M);
public:
static char ID; // Pass identification, replacement for typeid
EdgeProfiler() : ModulePass(ID) {
initializeEdgeProfilerPass(*PassRegistry::getPassRegistry());
}
virtual const char *getPassName() const {
return "Edge Profiler";
}
};
}
char EdgeProfiler::ID = 0;
INITIALIZE_PASS(EdgeProfiler, "insert-edge-profiling",
"Insert instrumentation for edge profiling", false, false)
ModulePass *llvm::createEdgeProfilerPass() { return new EdgeProfiler(); }
bool EdgeProfiler::runOnModule(Module &M) {
Function *Main = M.getFunction("main");
if (Main == 0) {
errs() << "WARNING: cannot insert edge profiling into a module"
<< " with no main function!\n";
return false; // No main, no instrumentation!
}
std::set<BasicBlock*> BlocksToInstrument;
unsigned NumEdges = 0;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
if (F->isDeclaration()) continue;
// Reserve space for (0,entry) edge.
++NumEdges;
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
// Keep track of which blocks need to be instrumented. We don't want to
// instrument blocks that are added as the result of breaking critical
// edges!
BlocksToInstrument.insert(BB);
NumEdges += BB->getTerminator()->getNumSuccessors();
}
}
Type *ATy = ArrayType::get(Type::getInt32Ty(M.getContext()), NumEdges);
GlobalVariable *Counters =
new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
Constant::getNullValue(ATy), "EdgeProfCounters");
NumEdgesInserted = NumEdges;
// Instrument all of the edges...
unsigned i = 0;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
if (F->isDeclaration()) continue;
// Create counter for (0,entry) edge.
IncrementCounterInBlock(&F->getEntryBlock(), i++, Counters);
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB)
if (BlocksToInstrument.count(BB)) { // Don't instrument inserted blocks
// Okay, we have to add a counter of each outgoing edge. If the
// outgoing edge is not critical don't split it, just insert the counter
// in the source or destination of the edge.
TerminatorInst *TI = BB->getTerminator();
for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
// If the edge is critical, split it.
SplitCriticalEdge(TI, s, this);
// Okay, we are guaranteed that the edge is no longer critical. If we
// only have a single successor, insert the counter in this block,
// otherwise insert it in the successor block.
if (TI->getNumSuccessors() == 1) {
// Insert counter at the start of the block
IncrementCounterInBlock(BB, i++, Counters, false);
} else {
// Insert counter at the start of the block
IncrementCounterInBlock(TI->getSuccessor(s), i++, Counters);
}
}
}
}
// Add the initialization call to main.
InsertProfilingInitCall(Main, "llvm_start_edge_profiling", Counters);
return true;
}

3
lib/Transforms/Instrumentation/Instrumentation.cpp
View File

@@ -24,10 +24,7 @@ void llvm::initializeInstrumentation(PassRegistry &Registry) {
initializeAddressSanitizerPass(Registry);
initializeAddressSanitizerModulePass(Registry);
initializeBoundsCheckingPass(Registry);
initializeEdgeProfilerPass(Registry);
initializeGCOVProfilerPass(Registry);
initializeOptimalEdgeProfilerPass(Registry);
initializePathProfilerPass(Registry);
initializeMemorySanitizerPass(Registry);
initializeThreadSanitizerPass(Registry);
initializeDataFlowSanitizerPass(Registry);

225
lib/Transforms/Instrumentation/OptimalEdgeProfiling.cpp
View File

@@ -1,225 +0,0 @@
//===- OptimalEdgeProfiling.cpp - Insert counters for opt. edge profiling -===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass instruments the specified program with counters for edge profiling.
// Edge profiling can give a reasonable approximation of the hot paths through a
// program, and is used for a wide variety of program transformations.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "insert-optimal-edge-profiling"
#include "llvm/Transforms/Instrumentation.h"
#include "MaximumSpanningTree.h"
#include "ProfilingUtils.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/Passes.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Analysis/ProfileInfoLoader.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
using namespace llvm;
STATISTIC(NumEdgesInserted, "The # of edges inserted.");
namespace {
class OptimalEdgeProfiler : public ModulePass {
bool runOnModule(Module &M);
public:
static char ID; // Pass identification, replacement for typeid
OptimalEdgeProfiler() : ModulePass(ID) {
initializeOptimalEdgeProfilerPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredID(ProfileEstimatorPassID);
AU.addRequired<ProfileInfo>();
}
virtual const char *getPassName() const {
return "Optimal Edge Profiler";
}
};
}
char OptimalEdgeProfiler::ID = 0;
INITIALIZE_PASS_BEGIN(OptimalEdgeProfiler, "insert-optimal-edge-profiling",
"Insert optimal instrumentation for edge profiling",
false, false)
INITIALIZE_PASS_DEPENDENCY(ProfileEstimatorPass)
INITIALIZE_AG_DEPENDENCY(ProfileInfo)
INITIALIZE_PASS_END(OptimalEdgeProfiler, "insert-optimal-edge-profiling",
"Insert optimal instrumentation for edge profiling",
false, false)
ModulePass *llvm::createOptimalEdgeProfilerPass() {
return new OptimalEdgeProfiler();
}
inline static void printEdgeCounter(ProfileInfo::Edge e,
BasicBlock* b,
unsigned i) {
DEBUG(dbgs() << "--Edge Counter for " << (e) << " in " \
<< ((b)?(b)->getName():"0") << " (# " << (i) << ")\n");
}
bool OptimalEdgeProfiler::runOnModule(Module &M) {
Function *Main = M.getFunction("main");
if (Main == 0) {
errs() << "WARNING: cannot insert edge profiling into a module"
<< " with no main function!\n";
return false; // No main, no instrumentation!
}
// NumEdges counts all the edges that may be instrumented. Later on its
// decided which edges to actually instrument, to achieve optimal profiling.
// For the entry block a virtual edge (0,entry) is reserved, for each block
// with no successors an edge (BB,0) is reserved. These edges are necessary
// to calculate a truly optimal maximum spanning tree and thus an optimal
// instrumentation.
unsigned NumEdges = 0;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
if (F->isDeclaration()) continue;
// Reserve space for (0,entry) edge.
++NumEdges;
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
// Keep track of which blocks need to be instrumented. We don't want to
// instrument blocks that are added as the result of breaking critical
// edges!
if (BB->getTerminator()->getNumSuccessors() == 0) {
// Reserve space for (BB,0) edge.
++NumEdges;
} else {
NumEdges += BB->getTerminator()->getNumSuccessors();
}
}
}
// In the profiling output a counter for each edge is reserved, but only few
// are used. This is done to be able to read back in the profile without
// calulating the maximum spanning tree again, instead each edge counter that
// is not used is initialised with -1 to signal that this edge counter has to
// be calculated from other edge counters on reading the profile info back
// in.
Type *Int32 = Type::getInt32Ty(M.getContext());
ArrayType *ATy = ArrayType::get(Int32, NumEdges);
GlobalVariable *Counters =
new GlobalVariable(M, ATy, false, GlobalValue::InternalLinkage,
Constant::getNullValue(ATy), "OptEdgeProfCounters");
NumEdgesInserted = 0;
std::vector<Constant*> Initializer(NumEdges);
Constant *Zero = ConstantInt::get(Int32, 0);
Constant *Uncounted = ConstantInt::get(Int32, ProfileInfoLoader::Uncounted);
// Instrument all of the edges not in MST...
unsigned i = 0;
for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
if (F->isDeclaration()) continue;
DEBUG(dbgs() << "Working on " << F->getName() << "\n");
// Calculate a Maximum Spanning Tree with the edge weights determined by
// ProfileEstimator. ProfileEstimator also assign weights to the virtual
// edges (0,entry) and (BB,0) (for blocks with no successors) and this
// edges also participate in the maximum spanning tree calculation.
// The third parameter of MaximumSpanningTree() has the effect that not the
// actual MST is returned but the edges _not_ in the MST.
ProfileInfo::EdgeWeights ECs =
getAnalysis<ProfileInfo>(*F).getEdgeWeights(F);
std::vector<ProfileInfo::EdgeWeight> EdgeVector(ECs.begin(), ECs.end());
MaximumSpanningTree<BasicBlock> MST(EdgeVector);
std::stable_sort(MST.begin(), MST.end());
// Check if (0,entry) not in the MST. If not, instrument edge
// (IncrementCounterInBlock()) and set the counter initially to zero, if
// the edge is in the MST the counter is initialised to -1.
BasicBlock *entry = &(F->getEntryBlock());
ProfileInfo::Edge edge = ProfileInfo::getEdge(0, entry);
if (!std::binary_search(MST.begin(), MST.end(), edge)) {
printEdgeCounter(edge, entry, i);
IncrementCounterInBlock(entry, i, Counters); ++NumEdgesInserted;
Initializer[i++] = (Zero);
} else{
Initializer[i++] = (Uncounted);
}
// InsertedBlocks contains all blocks that were inserted for splitting an
// edge, this blocks do not have to be instrumented.
DenseSet<BasicBlock*> InsertedBlocks;
for (Function::iterator BB = F->begin(), E = F->end(); BB != E; ++BB) {
// Check if block was not inserted and thus does not have to be
// instrumented.
if (InsertedBlocks.count(BB)) continue;
// Okay, we have to add a counter of each outgoing edge not in MST. If
// the outgoing edge is not critical don't split it, just insert the
// counter in the source or destination of the edge. Also, if the block
// has no successors, the virtual edge (BB,0) is processed.
TerminatorInst *TI = BB->getTerminator();
if (TI->getNumSuccessors() == 0) {
ProfileInfo::Edge edge = ProfileInfo::getEdge(BB, 0);
if (!std::binary_search(MST.begin(), MST.end(), edge)) {
printEdgeCounter(edge, BB, i);
IncrementCounterInBlock(BB, i, Counters); ++NumEdgesInserted;
Initializer[i++] = (Zero);
} else{
Initializer[i++] = (Uncounted);
}
}
for (unsigned s = 0, e = TI->getNumSuccessors(); s != e; ++s) {
BasicBlock *Succ = TI->getSuccessor(s);
ProfileInfo::Edge edge = ProfileInfo::getEdge(BB,Succ);
if (!std::binary_search(MST.begin(), MST.end(), edge)) {
// If the edge is critical, split it.
bool wasInserted = SplitCriticalEdge(TI, s, this);
Succ = TI->getSuccessor(s);
if (wasInserted)
InsertedBlocks.insert(Succ);
// Okay, we are guaranteed that the edge is no longer critical. If
// we only have a single successor, insert the counter in this block,
// otherwise insert it in the successor block.
if (TI->getNumSuccessors() == 1) {
// Insert counter at the start of the block
printEdgeCounter(edge, BB, i);
IncrementCounterInBlock(BB, i, Counters); ++NumEdgesInserted;
} else {
// Insert counter at the start of the block
printEdgeCounter(edge, Succ, i);
IncrementCounterInBlock(Succ, i, Counters); ++NumEdgesInserted;
}
Initializer[i++] = (Zero);
} else {
Initializer[i++] = (Uncounted);
}
}
}
}
// Check if the number of edges counted at first was the number of edges we
// considered for instrumentation.
assert(i == NumEdges && "the number of edges in counting array is wrong");
// Assign the now completely defined initialiser to the array.
Constant *init = ConstantArray::get(ATy, Initializer);
Counters->setInitializer(init);
// Add the initialization call to main.
InsertProfilingInitCall(Main, "llvm_start_opt_edge_profiling", Counters);
return true;
}

1424
lib/Transforms/Instrumentation/PathProfiling.cpp
View File

File diff suppressed because it is too large Load Diff

8
lib/Transforms/Scalar/CodeGenPrepare.cpp
View File

@@ -22,7 +22,6 @@
#include "llvm/Analysis/DominatorInternals.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Assembly/Writer.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
@@ -80,7 +79,6 @@ namespace {
const TargetLowering *TLI;
const TargetLibraryInfo *TLInfo;
DominatorTree *DT;
ProfileInfo *PFI;
/// CurInstIterator - As we scan instructions optimizing them, this is the
/// next instruction to optimize. Xforms that can invalidate this should
@@ -111,7 +109,6 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<DominatorTree>();
AU.addPreserved<ProfileInfo>();
AU.addRequired<TargetLibraryInfo>();
}
@@ -151,7 +148,6 @@ bool CodeGenPrepare::runOnFunction(Function &F) {
if (TM) TLI = TM->getTargetLowering();
TLInfo = &getAnalysis<TargetLibraryInfo>();
DT = getAnalysisIfAvailable<DominatorTree>();
PFI = getAnalysisIfAvailable<ProfileInfo>();
OptSize = F.getAttributes().hasAttribute(AttributeSet::FunctionIndex,
Attribute::OptimizeForSize);
@@ -442,10 +438,6 @@ void CodeGenPrepare::EliminateMostlyEmptyBlock(BasicBlock *BB) {
DT->changeImmediateDominator(DestBB, NewIDom);
DT->eraseNode(BB);
}
if (PFI) {
PFI->replaceAllUses(BB, DestBB);
PFI->removeEdge(ProfileInfo::getEdge(BB, DestBB));
}
BB->eraseFromParent();
++NumBlocksElim;

9
lib/Transforms/Utils/BreakCriticalEdges.cpp
View File

@@ -22,7 +22,6 @@
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Type.h"
@@ -45,7 +44,6 @@ namespace {
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addPreserved<DominatorTree>();
AU.addPreserved<LoopInfo>();
AU.addPreserved<ProfileInfo>();
// No loop canonicalization guarantees are broken by this pass.
AU.addPreservedID(LoopSimplifyID);
@@ -213,10 +211,9 @@ BasicBlock *llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
DominatorTree *DT = P->getAnalysisIfAvailable<DominatorTree>();
LoopInfo *LI = P->getAnalysisIfAvailable<LoopInfo>();
ProfileInfo *PI = P->getAnalysisIfAvailable<ProfileInfo>();
// If we have nothing to update, just return.
if (DT == 0 && LI == 0 && PI == 0)
if (DT == 0 && LI == 0)
return NewBB;
// Now update analysis information. Since the only predecessor of NewBB is
@@ -369,9 +366,5 @@ BasicBlock *llvm::SplitCriticalEdge(TerminatorInst *TI, unsigned SuccNum,
}
}
// Update ProfileInfo if it is around.
if (PI)
PI->splitEdge(TIBB, DestBB, NewBB, MergeIdenticalEdges);
return NewBB;
}

6
lib/Transforms/Utils/Local.cpp
View File

@@ -20,7 +20,6 @@
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/ProfileInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/DIBuilder.h"
#include "llvm/DebugInfo.h"
@@ -513,11 +512,6 @@ void llvm::MergeBasicBlockIntoOnlyPred(BasicBlock *DestBB, Pass *P) {
DT->changeImmediateDominator(DestBB, PredBBIDom);
DT->eraseNode(PredBB);
}
ProfileInfo *PI = P->getAnalysisIfAvailable<ProfileInfo>();
if (PI) {
PI->replaceAllUses(PredBB, DestBB);
PI->removeEdge(ProfileInfo::getEdge(PredBB, DestBB));
}
}
// Nuke BB.
PredBB->eraseFromParent();