[llvm-commits] CVS: llvm/lib/Transforms/Scalar/GVNPRE.cpp

[Owen Anderson]

Changes in directory llvm/lib/Transforms/Scalar:

GVNPRE.cpp updated: 1.4 -> 1.5
---
Log message:

Re-fix a bug, where I was now being too aggressive.


---
Diffs of the changes:  (+5 -1)

 GVNPRE.cpp |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)


Index: llvm/lib/Transforms/Scalar/GVNPRE.cpp
diff -u llvm/lib/Transforms/Scalar/GVNPRE.cpp:1.4 
llvm/lib/Transforms/Scalar/GVNPRE.cpp:1.5
--- llvm/lib/Transforms/Scalar/GVNPRE.cpp:1.4   Tue May 29 18:15:21 2007
+++ llvm/lib/Transforms/Scalar/GVNPRE.cpp       Tue May 29 18:26:30 2007
@@ -376,6 +376,8 @@
   
   // Second Phase of BuildSets - calculate ANTIC_IN
   
+  std::set<BasicBlock*> visited;
+  
   bool changed = true;
   unsigned iterations = 0;
   while (changed) {
@@ -388,6 +390,8 @@
          PDI != E; ++PDI) {
       BasicBlock* BB = PDI->getBlock();
       
+      visited.insert(BB);
+      
       std::set<Expression>& anticIn = anticipatedIn[BB];
       std::set<Expression> old (anticIn.begin(), anticIn.end());
       
@@ -397,7 +401,7 @@
         for (unsigned i = 0; i < BB->getTerminator()->getNumSuccessors(); ++i) 
{
           BasicBlock* currSucc = BB->getTerminator()->getSuccessor(i);
           std::set<Expression> temp;
-          if (i == 0)
+          if (visted.find(currSucc) == visited.end())
             temp.insert(maximalSet.begin(), maximalSet.end());
           else
             temp.insert(anticIn.begin(), anticIn.end());



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