From: Dale Johannesen <dalej@apple.com>
Date: Tue, 8 May 2007 01:01:04 +0000 (+0000)
Subject: Don't generate branch to entry block.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=6603a1bff0e25e1d9f7be08c65c7b584c7bb84d7;p=oota-llvm.git

Don't generate branch to entry block.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36917 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp
index cb7d1e8221e..9fa044e4c76 100644
--- a/lib/Transforms/Scalar/CodeGenPrepare.cpp
+++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp
@@ -280,7 +280,9 @@ static void SplitEdgeNicely(TerminatorInst *TI, unsigned SuccNum, Pass *P) {
     BranchInst *PredBr = dyn_cast<BranchInst>(Pred->getTerminator());
     if (!PredBr || !PredBr->isUnconditional() ||
         // Must be empty other than the branch.
-        &Pred->front() != PredBr)
+        &Pred->front() != PredBr ||
+        // Cannot be the entry block; its label does not get emitted.
+        Pred == &(Dest->getParent()->getEntryBlock()))
       continue;
     
     // Finally, since we know that Dest has phi nodes in it, we have to make