do not repeatedly dereference use_iterator

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107962 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
index c533d6e5e5f0dd7631024d72d77df953d63142b9..946c3ee0c7829277de4be16895ad9fd7470a0aaa 100644 (file)
--- a/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
+++ b/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp
@@ -365,10 +365,11 @@ DbgDeclareInst *InstCombiner::hasOneUsePlusDeclare(Value *V) {
     return 0;
   for (Value::use_iterator UI = V->use_begin(), E = V->use_end();
        UI != E; ++UI) {
-    if (DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(UI))
+    User *U = *UI;
+    if (DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(U))
       return DI;
-    if (isa<BitCastInst>(UI) && UI->hasOneUse()) {
-      if (DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(UI->use_begin()))
+    if (isa<BitCastInst>(U) && U->hasOneUse()) {
+      if (DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(U->use_begin()))
         return DI;
       }
   }