commit 049cb4482ff89e90533fc78fc55fddb3f798d2c9
author Chris Lattner <sabre@nondot.org> Mon Sep 19 23:57:04 2005 +0000
committer Chris Lattner <sabre@nondot.org> Mon Sep 19 23:57:04 2005 +0000
tree c9d5df266a7e367d572f1fd7b93c5c7a3b950958
parent a160924d57b21c7eddba08f695e0ebe5beb139d3

Reject a case we don't handle yet

llvm-svn: 23393

llvm/lib/Transforms/Utils/SimplifyCFG.cpp

diff --git a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
index 08403ae..c0cb2f4 100644
--- a/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
+++ b/llvm/lib/Transforms/Utils/SimplifyCFG.cpp
@@ -897,7 +897,9 @@
 static bool FoldCondBranchOnPHI(BranchInst *BI) {
   BasicBlock *BB = BI->getParent();
   PHINode *PN = dyn_cast<PHINode>(BI->getCondition());
-  if (!PN || PN->getParent() != BB) return false;
+  // NOTE: we currently cannot transform this case if the PHI node is used
+  // outside of the block.
+  if (!PN || PN->getParent() != BB || !PN->hasOneUse()) return false;
   
   // Degenerate case of a single entry PHI.
   if (PN->getNumIncomingValues() == 1) {