Index: llvm/trunk/lib/Object/IRObjectFile.cpp
===================================================================
--- llvm/trunk/lib/Object/IRObjectFile.cpp
+++ llvm/trunk/lib/Object/IRObjectFile.cpp
@@ -198,6 +198,9 @@
     return std::error_code();
   }
 
+  if (GV->hasDLLImportStorageClass())
+    OS << "__imp_";
+
   if (Mang)
     Mang->getNameWithPrefix(OS, GV, false);
   else
Index: llvm/trunk/test/CodeGen/X86/dllimport.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/dllimport.ll
+++ llvm/trunk/test/CodeGen/X86/dllimport.ll
@@ -57,3 +57,7 @@
 
   ret void
 }
+
+; CHECK: _fp:
+; CHECK-NEXT: .long _fun
+@fp = constant void ()* @fun
Index: llvm/trunk/test/Object/dllimport.ll
===================================================================
--- llvm/trunk/test/Object/dllimport.ll
+++ llvm/trunk/test/Object/dllimport.ll
@@ -0,0 +1,17 @@
+; RUN: llvm-as %s -o - | llvm-nm - | FileCheck %s
+
+target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-pc-windows-msvc"
+
+; CHECK: U __imp_f
+; CHECK: U __imp_v
+; CHECK: T g
+
+declare dllimport void @f()
+@v = external dllimport global i32
+
+define void @g() {
+  call void @f()
+  store i32 42, i32* @v
+  ret void
+}