Check alignment of loads when deciding whether it is safe to execute them

unconditionally.  Besides checking the offset, also check that the underlying
object is aligned as much as the load itself.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94875 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/TailRecursionElimination.cpp

@@ -211,7 +211,8 @@ bool TailCallElim::CanMoveAboveCall(Instruction *I, CallInst *CI) {
       // FIXME: Writes to memory only matter if they may alias the pointer
       // being loaded from.
       if (CI->mayWriteToMemory() ||
-          !isSafeToLoadUnconditionally(L->getPointerOperand(), L))
+          !isSafeToLoadUnconditionally(L->getPointerOperand(), L,
+                                       L->getAlignment()))
         return false;
     }
   }