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Change data structure to memorize computed result in ScalarEvolution

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Replace std::map with SmallVector to memorize the cached result since SCEV usually belongs to little Loop/BB
Linear scan on SmallVector is faster than std::map.

Code reviewer : Andrew Trick.
Test result   : Pass Unit Test & LLVM Test Suite

401.bzip2	0.425721	0.419981	101.37%
403.gcc		24.53855	24.2667		101.12%
429.mcf		0.060847	0.059944	101.51%
433.milc	0.646009	0.636119	101.55%
444.namd	1.383928	1.370614	100.97%
445.gobmk	5.836575	5.800225	100.63%
450.soplex	1.911257	1.895963	100.81%
456.hmmer	1.039565	1.032534	100.68%
458.sjeng	0.897401	0.885567	101.34%
464.h264ref	3.645908	3.577991	101.90%
470.lbm		0.049456	0.048398	102.19%
471.omnetpp	5.638575	5.60435		100.61%
bitmnp01	0.045738	0.045291	100.99%
cjpegv2data	0.304359	0.302833	100.50%
idctrn01	0.046433	0.045763	101.46%
quake2		4.534416	4.4952		100.87%
quake		2.688566	2.659208	101.10%
xcsoar		12.42545	12.30385	100.99%
linpack		0.038739	0.03803		101.86%
matrix01	0.053564	0.0528		101.45%
nbench		0.402867	0.395803	101.78%
tblook01	0.021265	0.021015	101.19%
ttsprk01	0.066384	0.065566	101.25%

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194459 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Wan Xiaofei 2013-11-12 09:40:41 +00:00
parent e26299d76e
commit 3cda2d3885
2 changed files with 45 additions and 25 deletions
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6
include/llvm/Analysis/ScalarEvolution.h
View File

@ -361,18 +361,18 @@ namespace llvm {
/// that we attempt to compute getSCEVAtScope information for, which can
/// be expensive in extreme cases.
DenseMap<const SCEV *,
std::map<const Loop *, const SCEV *> > ValuesAtScopes;
SmallVector<std::pair<const Loop *, const SCEV *>, 2> > ValuesAtScopes;
/// LoopDispositions - Memoized computeLoopDisposition results.
DenseMap<const SCEV *,
std::map<const Loop *, LoopDisposition> > LoopDispositions;
SmallVector<std::pair<const Loop *, LoopDisposition>, 2> > LoopDispositions;
/// computeLoopDisposition - Compute a LoopDisposition value.
LoopDisposition computeLoopDisposition(const SCEV *S, const Loop *L);
/// BlockDispositions - Memoized computeBlockDisposition results.
DenseMap<const SCEV *,
std::map<const BasicBlock *, BlockDisposition> > BlockDispositions;
SmallVector<std::pair<const BasicBlock *, BlockDisposition>, 2> > BlockDispositions;
/// computeBlockDisposition - Compute a BlockDisposition value.
BlockDisposition computeBlockDisposition(const SCEV *S, const BasicBlock *BB);

64
lib/Analysis/ScalarEvolution.cpp
View File

@ -5059,15 +5059,21 @@ const SCEV *ScalarEvolution::ComputeExitCountExhaustively(const Loop *L,
/// original value V is returned.
const SCEV *ScalarEvolution::getSCEVAtScope(const SCEV *V, const Loop *L) {
// Check to see if we've folded this expression at this loop before.
std::map<const Loop *, const SCEV *> &Values = ValuesAtScopes[V];
std::pair<std::map<const Loop *, const SCEV *>::iterator, bool> Pair =
Values.insert(std::make_pair(L, static_cast<const SCEV *>(0)));
if (!Pair.second)
return Pair.first->second ? Pair.first->second : V;
SmallVector<std::pair<const Loop *, const SCEV *>, 2> &Values = ValuesAtScopes[V];
for (unsigned u = 0; u < Values.size(); u++) {
if (Values[u].first == L)
return Values[u].second ? Values[u].second : V;
}
Values.push_back(std::make_pair(L, static_cast<const SCEV *>(0)));
// Otherwise compute it.
const SCEV *C = computeSCEVAtScope(V, L);
ValuesAtScopes[V][L] = C;
SmallVector<std::pair<const Loop *, const SCEV *>, 2> &Values2 = ValuesAtScopes[V];
for (unsigned u = Values2.size(); u > 0; u--) {
if (Values2[u - 1].first == L) {
Values2[u - 1].second = C;
break;
}
}
return C;
}
@ -6727,7 +6733,7 @@ ScalarEvolution::SCEVCallbackVH::SCEVCallbackVH(Value *V, ScalarEvolution *se)
//===----------------------------------------------------------------------===//
ScalarEvolution::ScalarEvolution()
: FunctionPass(ID), FirstUnknown(0) {
: FunctionPass(ID), ValuesAtScopes(64), LoopDispositions(64), BlockDispositions(64), FirstUnknown(0) {
initializeScalarEvolutionPass(*PassRegistry::getPassRegistry());
}
@ -6865,14 +6871,21 @@ void ScalarEvolution::print(raw_ostream &OS, const Module *) const {
ScalarEvolution::LoopDisposition
ScalarEvolution::getLoopDisposition(const SCEV *S, const Loop *L) {
std::map<const Loop *, LoopDisposition> &Values = LoopDispositions[S];
std::pair<std::map<const Loop *, LoopDisposition>::iterator, bool> Pair =
Values.insert(std::make_pair(L, LoopVariant));
if (!Pair.second)
return Pair.first->second;
SmallVector<std::pair<const Loop *, LoopDisposition>, 2> &Values = LoopDispositions[S];
for (unsigned u = 0; u < Values.size(); u++) {
if (Values[u].first == L)
return Values[u].second;
}
Values.push_back(std::make_pair(L, LoopVariant));
LoopDisposition D = computeLoopDisposition(S, L);
return LoopDispositions[S][L] = D;
SmallVector<std::pair<const Loop *, LoopDisposition>, 2> &Values2 = LoopDispositions[S];
for (unsigned u = Values2.size(); u > 0; u--) {
if (Values2[u - 1].first == L) {
Values2[u - 1].second = D;
break;
}
}
return D;
}
ScalarEvolution::LoopDisposition
@ -6964,14 +6977,21 @@ bool ScalarEvolution::hasComputableLoopEvolution(const SCEV *S, const Loop *L) {
ScalarEvolution::BlockDisposition
ScalarEvolution::getBlockDisposition(const SCEV *S, const BasicBlock *BB) {
std::map<const BasicBlock *, BlockDisposition> &Values = BlockDispositions[S];
std::pair<std::map<const BasicBlock *, BlockDisposition>::iterator, bool>
Pair = Values.insert(std::make_pair(BB, DoesNotDominateBlock));
if (!Pair.second)
return Pair.first->second;
SmallVector<std::pair<const BasicBlock *, BlockDisposition>, 2> &Values = BlockDispositions[S];
for (unsigned u = 0; u < Values.size(); u++) {
if (Values[u].first == BB)
return Values[u].second;
}
Values.push_back(std::make_pair(BB, DoesNotDominateBlock));
BlockDisposition D = computeBlockDisposition(S, BB);
return BlockDispositions[S][BB] = D;
SmallVector<std::pair<const BasicBlock *, BlockDisposition>, 2> &Values2 = BlockDispositions[S];
for (unsigned u = Values2.size(); u > 0; u--) {
if (Values2[u - 1].first == BB) {
Values2[u - 1].second = D;
break;
}
}
return D;
}
ScalarEvolution::BlockDisposition