Index: lib/Sema/SemaDeclAttr.cpp
===================================================================
--- lib/Sema/SemaDeclAttr.cpp
+++ lib/Sema/SemaDeclAttr.cpp
@@ -4615,8 +4615,36 @@
   default: llvm_unreachable("unexpected attribute kind");
   }
 
+  TargetInfo::CallingConvCheckResult A = TargetInfo::CCCR_OK;
   const TargetInfo &TI = Context.getTargetInfo();
-  TargetInfo::CallingConvCheckResult A = TI.checkCallingConvention(CC);
+  auto *Aux = Context.getAuxTargetInfo();
+  if (LangOpts.CUDA) {
+    auto CudaTarget = IdentifyCUDATarget(FD);
+    bool CheckHost = false, CheckDevice = false;
+    switch (CudaTarget) {
+    case CFT_HostDevice:
+      CheckHost = true;
+      CheckDevice = true;
+      break;
+    case CFT_Host:
+      CheckHost = true;
+      break;
+    case CFT_Device:
+    case CFT_Global:
+      CheckDevice = true;
+      break;
+    case CFT_InvalidTarget:
+      llvm_unreachable("unexpected cuda target");
+    }
+    auto *HostTI = LangOpts.CUDAIsDevice ? Aux : &TI;
+    auto *DeviceTI = LangOpts.CUDAIsDevice ? &TI : Aux;
+    if (CheckHost && HostTI)
+      A = HostTI->checkCallingConvention(CC);
+    if (A == TargetInfo::CCCR_OK && CheckDevice && DeviceTI)
+      A = DeviceTI->checkCallingConvention(CC);
+  } else {
+    A = TI.checkCallingConvention(CC);
+  }
   if (A != TargetInfo::CCCR_OK) {
     if (A == TargetInfo::CCCR_Warning)
       Diag(Attrs.getLoc(), diag::warn_cconv_ignored) << Attrs;
Index: test/SemaCUDA/amdgpu-windows-vectorcall.cu
===================================================================
--- /dev/null
+++ test/SemaCUDA/amdgpu-windows-vectorcall.cu
@@ -0,0 +1,11 @@
+// RUN: %clang_cc1 -triple amdgcn-amd-amdhsa -aux-triple x86_64-pc-windows-msvc -fms-compatibility -fcuda-is-device -fsyntax-only -verify %s
+
+// expected-no-diagnostics
+template<class _Ty>
+ struct A
+ {
+ };
+
+template<class _Ret, class _Arg0, class _Types> struct A<_Ret (__cdecl _Arg0::*)(_Types) > { };
+template<class _Ret, class _Arg0, class _Types> struct A<_Ret (__vectorcall _Arg0::*)(_Types) > {};
+