Index: lib/Driver/Tools.cpp
===================================================================
--- lib/Driver/Tools.cpp
+++ lib/Driver/Tools.cpp
@@ -4930,6 +4930,8 @@
       case llvm::Triple::x86_64:
       case llvm::Triple::arm:
       case llvm::Triple::aarch64:
+      case llvm::Triple::mips:
+      case llvm::Triple::mipsel:
         // Supported.
         break;
       default:
Index: test/CodeGen/xray-attributes-supported-mips.cpp
===================================================================
--- /dev/null
+++ test/CodeGen/xray-attributes-supported-mips.cpp
@@ -0,0 +1,14 @@
+// RUN: %clang_cc1 %s -fxray-instrument -std=c++11 -x c++ -emit-llvm -o - -triple mips-unknown-linux-gnu | FileCheck %s
+// RUN: %clang_cc1 %s -fxray-instrument -std=c++11 -x c++ -emit-llvm -o - -triple mipsel-unknown-linux-gnu | FileCheck %s
+
+// Make sure that the LLVM attribute for XRay-annotated functions do show up.
+[[clang::xray_always_instrument]] void foo() {
+// CHECK: define void @_Z3foov() #0
+};
+
+[[clang::xray_never_instrument]] void bar() {
+// CHECK: define void @_Z3barv() #1
+};
+
+// CHECK: #0 = {{.*}}"function-instrument"="xray-always"
+// CHECK: #1 = {{.*}}"function-instrument"="xray-never"