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Using a deque to manage the stack of nodes is faster here.

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Vector is slow due to many reallocations as the size regularly changes in
  unpredictable ways. See the investigation provided on the mailing list for
  more information:

http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120116/135228.html


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218182 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lenny Maiorani 2014-09-20 13:29:20 +00:00
parent 3f34ae97b9
commit 31235e5b94
1 changed files with 6 additions and 2 deletions
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8
lib/Transforms/Scalar/EarlyCSE.cpp
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@ -26,7 +26,7 @@
#include "llvm/Support/RecyclingAllocator.h"
#include "llvm/Target/TargetLibraryInfo.h"
#include "llvm/Transforms/Utils/Local.h"
#include <vector>
#include <deque>
using namespace llvm;
#define DEBUG_TYPE "early-cse"
@ -560,7 +560,11 @@ bool EarlyCSE::runOnFunction(Function &F) {
if (skipOptnoneFunction(F))
return false;
std::vector<StackNode *> nodesToProcess;
// Note, deque is being used here because there is significant performance gains
// over vector when the container becomes very large due to the specific access
// patterns. For more information see the mailing list discussion on this:
// http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20120116/135228.html
std::deque<StackNode *> nodesToProcess;
DataLayoutPass *DLP = getAnalysisIfAvailable<DataLayoutPass>();
DL = DLP ? &DLP->getDataLayout() : nullptr;