r284166 - [analyzer] Remove superquadratic behaviour from DataflowWorklist

[Alexander Shaposhnikov via cfe-commits]

Author: alexshap
Date: Thu Oct 13 16:31:46 2016
New Revision: 284166

URL: http://llvm.org/viewvc/llvm-project?rev=284166&view=rev
Log:
[analyzer] Remove superquadratic behaviour from DataflowWorklist

The class DataflowWorklist internally maintains a sorted list of pointers to CFGBlock
and the method enqueuePredecessors has to call sortWorklist to maintain the invariant. 
The implementation based on vector + sort works well for small sizes 
but gets infeasible for relatively large sizes. In particular the issue takes place 
for some cryptographic libraries which use code generation. 
The diff replaces vector + sort with priority queue.
For one of the implementations of AES this patch reduces 
the time for analysis from 204 seconds to 8 seconds.

Test plan: make -j8 check-clang

Differential revision: https://reviews.llvm.org/D25503

Modified:
    cfe/trunk/lib/Analysis/LiveVariables.cpp

Modified: cfe/trunk/lib/Analysis/LiveVariables.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Analysis/LiveVariables.cpp?rev=284166&r1=284165&r2=284166&view=diff
==============================================================================
--- cfe/trunk/lib/Analysis/LiveVariables.cpp (original)
+++ cfe/trunk/lib/Analysis/LiveVariables.cpp Thu Oct 13 16:31:46 2016
@@ -19,6 +19,7 @@
 #include "clang/Analysis/CFG.h"
 #include "llvm/ADT/DenseMap.h"
 #include "llvm/ADT/PostOrderIterator.h"
+#include "llvm/ADT/PriorityQueue.h"
 #include "llvm/Support/raw_ostream.h"
 #include <algorithm>
 #include <vector>
@@ -28,20 +29,21 @@ using namespace clang;
 namespace {
 
 class DataflowWorklist {
-  SmallVector<const CFGBlock *, 20> worklist;
   llvm::BitVector enqueuedBlocks;
   PostOrderCFGView *POV;
+  llvm::PriorityQueue<const CFGBlock *, SmallVector<const CFGBlock *, 20>,
+                      PostOrderCFGView::BlockOrderCompare> worklist;
+
 public:
   DataflowWorklist(const CFG &cfg, AnalysisDeclContext &Ctx)
     : enqueuedBlocks(cfg.getNumBlockIDs()),
-      POV(Ctx.getAnalysis<PostOrderCFGView>()) {}
+      POV(Ctx.getAnalysis<PostOrderCFGView>()),
+      worklist(POV->getComparator()) {}
   
   void enqueueBlock(const CFGBlock *block);
   void enqueuePredecessors(const CFGBlock *block);
 
   const CFGBlock *dequeue();
-
-  void sortWorklist();
 };
 
 }
@@ -49,31 +51,22 @@ public:
 void DataflowWorklist::enqueueBlock(const clang::CFGBlock *block) {
   if (block && !enqueuedBlocks[block->getBlockID()]) {
     enqueuedBlocks[block->getBlockID()] = true;
-    worklist.push_back(block);
+    worklist.push(block);
   }
 }
 
 void DataflowWorklist::enqueuePredecessors(const clang::CFGBlock *block) {
-  const unsigned OldWorklistSize = worklist.size();
   for (CFGBlock::const_pred_iterator I = block->pred_begin(),
        E = block->pred_end(); I != E; ++I) {
     enqueueBlock(*I);
   }
-  
-  if (OldWorklistSize == 0 || OldWorklistSize == worklist.size())
-    return;
-
-  sortWorklist();
-}
-
-void DataflowWorklist::sortWorklist() {
-  std::sort(worklist.begin(), worklist.end(), POV->getComparator());
 }
 
 const CFGBlock *DataflowWorklist::dequeue() {
   if (worklist.empty())
     return nullptr;
-  const CFGBlock *b = worklist.pop_back_val();
+  const CFGBlock *b = worklist.top();
+  worklist.pop();
   enqueuedBlocks[b->getBlockID()] = false;
   return b;
 }
@@ -528,8 +521,6 @@ LiveVariables::computeLiveness(AnalysisD
       }
   }
   
-  worklist.sortWorklist();
-  
   while (const CFGBlock *block = worklist.dequeue()) {
     // Determine if the block's end value has changed.  If not, we
     // have nothing left to do for this block.