(Almost) always call reserveOperandSpace() on newly created PHINodes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128535 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 2 deletions

diff --git a/lib/Transforms/Instrumentation/PathProfiling.cpp b/lib/Transforms/Instrumentation/PathProfiling.cpp
index 6449b39cfc..ca2c6fbd95 100644
--- a/lib/Transforms/Instrumentation/PathProfiling.cpp
+++ b/lib/Transforms/Instrumentation/PathProfiling.cpp
@@ -929,14 +929,16 @@ BasicBlock::iterator PathProfiler::getInsertionPoint(BasicBlock* block, Value*
 void PathProfiler::preparePHI(BLInstrumentationNode* node) {
   BasicBlock* block = node->getBlock();
   BasicBlock::iterator insertPoint = block->getFirstNonPHI();
+  pred_iterator PB = pred_begin(node->getBlock()),
+          PE = pred_end(node->getBlock());
   PHINode* phi = PHINode::Create(Type::getInt32Ty(*Context), "pathNumber",
                                  insertPoint );
+  phi->reserveOperandSpace(std::distance(PB, PE));
   node->setPathPHI(phi);
   node->setStartingPathNumber(phi);
   node->setEndingPathNumber(phi);
 
-  for(pred_iterator predIt = pred_begin(node->getBlock()),
-        end = pred_end(node->getBlock()); predIt != end; predIt++) {
+  for(pred_iterator predIt = PB; predIt != PE; predIt++) {
     BasicBlock* pred = (*predIt);
 
     if(pred != NULL)