(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

2 files changed, 2 insertions, 0 deletions

diff --git a/lib/Transforms/InstCombine/InstCombineCasts.cpp b/lib/Transforms/InstCombine/InstCombineCasts.cpp
index dcf7be1..9976d82 100644
--- a/lib/Transforms/InstCombine/InstCombineCasts.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCasts.cpp
@@ -197,6 +197,7 @@ Value *InstCombiner::EvaluateInDifferentType(Value *V, const Type *Ty,
   case Instruction::PHI: {
     PHINode *OPN = cast<PHINode>(I);
     PHINode *NPN = PHINode::Create(Ty);
+    NPN->reserveOperandSpace(OPN->getNumIncomingValues());
     for (unsigned i = 0, e = OPN->getNumIncomingValues(); i != e; ++i) {
       Value *V =EvaluateInDifferentType(OPN->getIncomingValue(i), Ty, isSigned);
       NPN->addIncoming(V, OPN->getIncomingBlock(i));
diff --git a/lib/Transforms/InstCombine/InstCombinePHI.cpp b/lib/Transforms/InstCombine/InstCombinePHI.cpp
index 2c0714b..9e2e181 100644
--- a/lib/Transforms/InstCombine/InstCombinePHI.cpp
+++ b/lib/Transforms/InstCombine/InstCombinePHI.cpp
@@ -700,6 +700,7 @@ Instruction *InstCombiner::SliceUpIllegalIntegerPHI(PHINode &FirstPhi) {
       
       // Otherwise, Create the new PHI node for this user.
       EltPHI = PHINode::Create(Ty, PN->getName()+".off"+Twine(Offset), PN);
+      EltPHI->reserveOperandSpace(PN->getNumIncomingValues());
       assert(EltPHI->getType() != PN->getType() &&
              "Truncate didn't shrink phi?");