Skip ptr-to-ptr bitcasts when counting in another case.

llvm-svn: 66000

1 files changed, 4 insertions, 4 deletions

diff --git a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
index fd7b7da76fb..97460bf1add 100644
--- a/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
+++ b/llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
@@ -477,10 +477,10 @@ Value *llvm::FindAvailableLoadedValue(Value *Ptr, BasicBlock *ScanBB,
     Instruction *Inst = --ScanFrom;
     if (isa<DbgInfoIntrinsic>(Inst))
       continue;
-    // Likewise, we skip bitcasts that feed into a llvm.dbg.declare; these are
-    // not present when debugging is off.
-    if (isa<BitCastInst>(Inst) && Inst->hasOneUse() &&
-        isa<DbgDeclareInst>(Inst->use_begin()))
+    // We skip pointer-to-pointer bitcasts, which are NOPs.
+    // It is necessary for correctness to skip those that feed into a
+    // llvm.dbg.declare, as these are not present when debugging is off.
+    if (isa<BitCastInst>(Inst) && isa<PointerType>(Inst->getType()))
       continue;
 
     // Restore ScanFrom to expected value in case next test succeeds