diff --git a/llvm/include/llvm/CodeGen/CallingConvLower.h b/llvm/include/llvm/CodeGen/CallingConvLower.h
--- a/llvm/include/llvm/CodeGen/CallingConvLower.h
+++ b/llvm/include/llvm/CodeGen/CallingConvLower.h
@@ -434,7 +434,9 @@
   }
 
   // FIXME: Deprecate this function when transition to Align is over.
-  unsigned AllocateStack(unsigned Size, unsigned Alignment) {
+  LLVM_ATTRIBUTE_DEPRECATED(unsigned AllocateStack(unsigned Size,
+                                                   unsigned Alignment),
+                            "Use the version that takes Align instead.") {
     return AllocateStack(Size, Align(Alignment));
   }
 
@@ -444,7 +446,10 @@
   }
 
   /// Version of AllocateStack with extra register to be shadowed.
-  unsigned AllocateStack(unsigned Size, unsigned Align, unsigned ShadowReg) {
+  LLVM_ATTRIBUTE_DEPRECATED(unsigned AllocateStack(unsigned Size,
+                                                   unsigned Align,
+                                                   unsigned ShadowReg),
+                            "Use the version that takes Align instead.") {
     MarkAllocated(ShadowReg);
     return AllocateStack(Size, Align);
   }
diff --git a/llvm/lib/CodeGen/CallingConvLower.cpp b/llvm/lib/CodeGen/CallingConvLower.cpp
--- a/llvm/lib/CodeGen/CallingConvLower.cpp
+++ b/llvm/lib/CodeGen/CallingConvLower.cpp
@@ -54,7 +54,7 @@
   MF.getSubtarget().getTargetLowering()->HandleByVal(this, Size,
                                                      Alignment.value());
   Size = unsigned(alignTo(Size, MinAlign));
-  unsigned Offset = AllocateStack(Size, Alignment.value());
+  unsigned Offset = AllocateStack(Size, Alignment);
   addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
 }