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Change NonLocalDeps to be a densemap of pointers to densemap

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instead of containing them by value.  This increases the density
(!) of NonLocalDeps as well as making the reallocation case 
faster.  This speeds up gvn on 403.gcc by 2% and makes room for
future improvements.

I'm not super thrilled with having to explicitly manage the new/delete
of the map, but it is necesary for the next change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60271 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-11-30 02:28:25 +00:00
parent cfbb634225
commit f68f310386
2 changed files with 60 additions and 35 deletions
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13
include/llvm/Analysis/MemoryDependenceAnalysis.h
View File

@ -111,9 +111,9 @@ namespace llvm {
Normal,
/// None - This dependence type indicates that the query does not depend
/// on any instructions, either because it scanned to the start of the
/// function or it scanned to the definition of the memory
/// (alloca/malloc).
/// on any instructions, either because it is not a memory instruction or
/// because it scanned to the definition of the memory (alloca/malloc)
/// being accessed.
None,
/// NonLocal - This marker indicates that the query has no dependency in
@ -128,9 +128,9 @@ namespace llvm {
LocalDepMapType LocalDeps;
// A map from instructions to their non-local dependencies.
// FIXME: DENSEMAP of DENSEMAP not a great idea.
typedef DenseMap<Instruction*,
DenseMap<BasicBlock*, DepResultTy> > NonLocalDepMapType;
// This is an owning pointer.
DenseMap<BasicBlock*, DepResultTy>*> NonLocalDepMapType;
NonLocalDepMapType NonLocalDeps;
// A reverse mapping from dependencies to the dependees. This is
@ -153,6 +153,9 @@ namespace llvm {
/// Clean up memory in between runs
void releaseMemory() {
LocalDeps.clear();
for (NonLocalDepMapType::iterator I = NonLocalDeps.begin(),
E = NonLocalDeps.end(); I != E; ++I)
delete I->second;
NonLocalDeps.clear();
ReverseLocalDeps.clear();
ReverseNonLocalDeps.clear();

58
lib/Analysis/MemoryDependenceAnalysis.cpp
View File

@ -227,7 +227,10 @@ getNonLocalDependency(Instruction *QueryInst,
MemDepResult> > &Result) {
assert(getDependency(QueryInst).isNonLocal() &&
"getNonLocalDependency should only be used on insts with non-local deps!");
DenseMap<BasicBlock*, DepResultTy> &Cache = NonLocalDeps[QueryInst];
DenseMap<BasicBlock*, DepResultTy>* &CacheP = NonLocalDeps[QueryInst];
if (CacheP == 0) CacheP = new DenseMap<BasicBlock*, DepResultTy>();
DenseMap<BasicBlock*, DepResultTy> &Cache = *CacheP;
/// DirtyBlocks - This is the set of blocks that need to be recomputed. In
/// the cached case, this can happen due to instructions being deleted etc. In
@ -271,9 +274,15 @@ getNonLocalDependency(Instruction *QueryInst,
// If the dirty entry has a pointer, start scanning from it so we don't have
// to rescan the entire block.
BasicBlock::iterator ScanPos = DirtyBB->end();
if (Instruction *Inst = DirtyBBEntry.getPointer())
if (Instruction *Inst = DirtyBBEntry.getPointer()) {
ScanPos = Inst;
// We're removing QueryInst's dependence on Inst.
SmallPtrSet<Instruction*, 4> &InstMap = ReverseNonLocalDeps[Inst];
InstMap.erase(QueryInst);
if (InstMap.empty()) ReverseNonLocalDeps.erase(Inst);
}
// Find out if this block has a local dependency for QueryInst.
DirtyBBEntry = getDependencyFromInternal(QueryInst, ScanPos, DirtyBB);
@ -305,11 +314,16 @@ getNonLocalDependency(Instruction *QueryInst,
void MemoryDependenceAnalysis::removeInstruction(Instruction *RemInst) {
// Walk through the Non-local dependencies, removing this one as the value
// for any cached queries.
NonLocalDepMapType::iterator NLDI = NonLocalDeps.find(RemInst);
if (NLDI != NonLocalDeps.end()) {
DenseMap<BasicBlock*, DepResultTy> &BlockMap = *NLDI->second;
for (DenseMap<BasicBlock*, DepResultTy>::iterator DI =
NonLocalDeps[RemInst].begin(), DE = NonLocalDeps[RemInst].end();
DI != DE; ++DI)
BlockMap.begin(), DE = BlockMap.end(); DI != DE; ++DI)
if (Instruction *Inst = DI->second.getPointer())
ReverseNonLocalDeps[Inst].erase(RemInst);
delete &BlockMap;
NonLocalDeps.erase(NLDI);
}
// If we have a cached local dependence query for this instruction, remove it.
//
@ -347,10 +361,8 @@ void MemoryDependenceAnalysis::removeInstruction(Instruction *RemInst) {
for (SmallPtrSet<Instruction*, 4>::iterator I = ReverseDeps.begin(),
E = ReverseDeps.end(); I != E; ++I) {
Instruction *InstDependingOnRemInst = *I;
// If we thought the instruction depended on itself (possible for
// unconfirmed dependencies) ignore the update.
if (InstDependingOnRemInst == RemInst) continue;
assert(InstDependingOnRemInst != RemInst &&
"Already removed our local dep info");
LocalDeps[InstDependingOnRemInst] = DepResultTy(NewDepInst, Dirty);
@ -374,11 +386,16 @@ void MemoryDependenceAnalysis::removeInstruction(Instruction *RemInst) {
if (ReverseDepIt != ReverseNonLocalDeps.end()) {
SmallPtrSet<Instruction*, 4>& set = ReverseDepIt->second;
for (SmallPtrSet<Instruction*, 4>::iterator I = set.begin(), E = set.end();
I != E; ++I)
I != E; ++I) {
assert(*I != RemInst && "Already removed NonLocalDep info for RemInst");
DenseMap<BasicBlock*, DepResultTy> &INLD = *NonLocalDeps[*I];
assert(&INLD != 0 && "Reverse mapping out of date?");
for (DenseMap<BasicBlock*, DepResultTy>::iterator
DI = NonLocalDeps[*I].begin(), DE = NonLocalDeps[*I].end();
DI != DE; ++DI)
if (DI->second.getPointer() == RemInst) {
DI = INLD.begin(), DE = INLD.end(); DI != DE; ++DI) {
if (DI->second.getPointer() != RemInst) continue;
// Convert to a dirty entry for the subsequent instruction.
DI->second.setInt(Dirty);
if (RemInst->isTerminator())
@ -386,10 +403,10 @@ void MemoryDependenceAnalysis::removeInstruction(Instruction *RemInst) {
else {
Instruction *NextI = next(BasicBlock::iterator(RemInst));
DI->second.setPointer(NextI);
assert(NextI != RemInst);
ReverseDepsToAdd.push_back(std::make_pair(NextI, *I));
}
}
}
ReverseNonLocalDeps.erase(ReverseDepIt);
@ -401,7 +418,7 @@ void MemoryDependenceAnalysis::removeInstruction(Instruction *RemInst) {
}
}
NonLocalDeps.erase(RemInst);
assert(!NonLocalDeps.count(RemInst) && "RemInst got reinserted?");
getAnalysis<AliasAnalysis>().deleteValue(RemInst);
DEBUG(verifyRemoved(RemInst));
}
@ -419,21 +436,26 @@ void MemoryDependenceAnalysis::verifyRemoved(Instruction *D) const {
for (NonLocalDepMapType::const_iterator I = NonLocalDeps.begin(),
E = NonLocalDeps.end(); I != E; ++I) {
assert(I->first != D && "Inst occurs in data structures");
for (DenseMap<BasicBlock*, DepResultTy>::iterator II = I->second.begin(),
EE = I->second.end(); II != EE; ++II)
DenseMap<BasicBlock*, DepResultTy> &INLD = *I->second;
for (DenseMap<BasicBlock*, DepResultTy>::iterator II = INLD.begin(),
EE = INLD.end(); II != EE; ++II)
assert(II->second.getPointer() != D && "Inst occurs in data structures");
}
for (ReverseDepMapType::const_iterator I = ReverseLocalDeps.begin(),
E = ReverseLocalDeps.end(); I != E; ++I)
E = ReverseLocalDeps.end(); I != E; ++I) {
assert(I->first != D && "Inst occurs in data structures");
for (SmallPtrSet<Instruction*, 4>::const_iterator II = I->second.begin(),
EE = I->second.end(); II != EE; ++II)
assert(*II != D && "Inst occurs in data structures");
}
for (ReverseDepMapType::const_iterator I = ReverseNonLocalDeps.begin(),
E = ReverseNonLocalDeps.end();
I != E; ++I)
I != E; ++I) {
assert(I->first != D && "Inst occurs in data structures");
for (SmallPtrSet<Instruction*, 4>::const_iterator II = I->second.begin(),
EE = I->second.end(); II != EE; ++II)
assert(*II != D && "Inst occurs in data structures");
}
}