Improve comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42132 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 07eb252..3a7d101 100644 (file)
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -8939,8 +8939,9 @@ static bool isSafeToLoadUnconditionally(Value *V, Instruction *ScanFrom) {
   // If it is an alloca it is always safe to load from.
   if (isa<AllocaInst>(V)) return true;
 
-  // Don't try to evaluate aliases.  External weak GV can be null.
+  // If it is a global variable it is mostly safe to load from.
   if (const GlobalValue *GV = dyn_cast<GlobalVariable>(V))
+    // Don't try to evaluate aliases.  External weak GV can be null.
     return !isa<GlobalAlias>(GV) && !GV->hasExternalWeakLinkage();
 
   // Otherwise, be a little bit agressive by scanning the local block where we