Don't use PN->replaceUsesOfWith() to change a PHINode's incoming blocks,

because it won't work after my phi operand changes, because the incoming
blocks will no longer be Uses.

llvm-svn: 133512

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopDeletion.cpp b/llvm/lib/Transforms/Scalar/LoopDeletion.cpp
index 753a558cfe8..f7f32981baa 100644
--- a/llvm/lib/Transforms/Scalar/LoopDeletion.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopDeletion.cpp
@@ -190,7 +190,9 @@ bool LoopDeletion::runOnLoop(Loop* L, LPPassManager& LPM) {
   BasicBlock* exitingBlock = exitingBlocks[0];
   BasicBlock::iterator BI = exitBlock->begin();
   while (PHINode* P = dyn_cast<PHINode>(BI)) {
-    P->replaceUsesOfWith(exitingBlock, preheader);
+    int j = P->getBasicBlockIndex(exitingBlock);
+    assert(j >= 0 && "Can't find exiting block in exit block's phi node!");
+    P->setIncomingBlock(j, preheader);
     for (unsigned i = 1; i < exitingBlocks.size(); ++i)
       P->removeIncomingValue(exitingBlocks[i]);
     ++BI;