Index: llvm/trunk/lib/CodeGen/GlobalISel/IRTranslator.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/GlobalISel/IRTranslator.cpp
+++ llvm/trunk/lib/CodeGen/GlobalISel/IRTranslator.cpp
@@ -817,6 +817,10 @@
   auto TII = MF->getTarget().getIntrinsicInfo();
   const Function *F = CI.getCalledFunction();
 
+  // FIXME: support Windows dllimport function calls.
+  if (F && F->hasDLLImportStorageClass())
+    return false;
+
   if (CI.isInlineAsm())
     return translateInlineAsm(CI, MIRBuilder);
 
Index: llvm/trunk/test/CodeGen/AArch64/dllimport.ll
===================================================================
--- llvm/trunk/test/CodeGen/AArch64/dllimport.ll
+++ llvm/trunk/test/CodeGen/AArch64/dllimport.ll
@@ -1,5 +1,6 @@
 ; RUN: llc -mtriple aarch64-unknown-windows-msvc -filetype asm -o - %s | FileCheck %s -check-prefixes=CHECK,DAG-ISEL
 ; RUN: llc -mtriple aarch64-unknown-windows-msvc -fast-isel -filetype asm -o - %s | FileCheck %s -check-prefixes=CHECK,FAST-ISEL
+; RUN: llc -mtriple aarch64-unknown-windows-msvc -O0 -filetype asm -o - %s | FileCheck %s -check-prefixes=CHECK,GLOBAL-ISEL,GLOBAL-ISEL-FALLBACK
 
 @var = external dllimport global i32
 @ext = external global i32
@@ -27,6 +28,8 @@
 ; DAG-ISEL: ldr w0, [x8, ext]
 ; FAST-ISEL: add x8, x8, ext
 ; FAST-ISEL: ldr w0, [x8]
+; GLOBAL-ISEL-FALLBACK: add x8, x8, ext
+; GLOBAL-ISEL-FALLBACK: ldr w0, [x8]
 ; CHECK: ret
 
 define i32* @get_var_pointer() {
@@ -54,4 +57,6 @@
 }
 
 ; CHECK-LABEL: call_internal
-; CHECK: b internal
+; DAG-ISEL: b internal
+; FAST-ISEL: b internal
+; GLOBAL-ISEL: bl internal