[llvm] r238462 - Add BranchProbabilityInfo::releaseMemory to clear the Weights field.

[Pete Cooper]

Author: pete
Date: Thu May 28 14:43:06 2015
New Revision: 238462

URL: http://llvm.org/viewvc/llvm-project?rev=238462&view=rev
Log:
Add BranchProbabilityInfo::releaseMemory to clear the Weights field.

BranchProbabilityInfo was leaking 3MB of memory when running 'opt -O2 verify-uselistorder.lto.bc'.  This was due to the Weights member not being cleared once the pass is no longer needed.

This adds the releaseMemory override to clear that field.  The other fields are cleared at the end of runOnFunction so can stay there.

Modified:
    llvm/trunk/include/llvm/Analysis/BranchProbabilityInfo.h
    llvm/trunk/lib/Analysis/BranchProbabilityInfo.cpp

Modified: llvm/trunk/include/llvm/Analysis/BranchProbabilityInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Analysis/BranchProbabilityInfo.h?rev=238462&r1=238461&r2=238462&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Analysis/BranchProbabilityInfo.h (original)
+++ llvm/trunk/include/llvm/Analysis/BranchProbabilityInfo.h Thu May 28 14:43:06 2015
@@ -47,6 +47,9 @@ public:
 
   void getAnalysisUsage(AnalysisUsage &AU) const override;
   bool runOnFunction(Function &F) override;
+
+  void releaseMemory() override;
+
   void print(raw_ostream &OS, const Module *M = nullptr) const override;
 
   /// \brief Get an edge's probability, relative to other out-edges of the Src.

Modified: llvm/trunk/lib/Analysis/BranchProbabilityInfo.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/BranchProbabilityInfo.cpp?rev=238462&r1=238461&r2=238462&view=diff
==============================================================================
--- llvm/trunk/lib/Analysis/BranchProbabilityInfo.cpp (original)
+++ llvm/trunk/lib/Analysis/BranchProbabilityInfo.cpp Thu May 28 14:43:06 2015
@@ -543,6 +543,10 @@ bool BranchProbabilityInfo::runOnFunctio
   return false;
 }
 
+void BranchProbabilityInfo::releaseMemory() {
+  Weights.clear();
+}
+
 void BranchProbabilityInfo::print(raw_ostream &OS, const Module *) const {
   OS << "---- Branch Probabilities ----\n";
   // We print the probabilities from the last function the analysis ran over,