Index: include/llvm/ADT/Triple.h
===================================================================
--- include/llvm/ADT/Triple.h
+++ include/llvm/ADT/Triple.h
@@ -179,7 +179,8 @@
     WatchOS,    // Apple watchOS
     Mesa3D,
     Contiki,
-    LastOSType = Contiki
+    AMDPAL,     // AMD PAL Runtime
+    LastOSType = AMDPAL
   };
   enum EnvironmentType {
     UnknownEnvironment,
Index: lib/Support/Triple.cpp
===================================================================
--- lib/Support/Triple.cpp
+++ lib/Support/Triple.cpp
@@ -207,6 +207,7 @@
   case WatchOS: return "watchos";
   case Mesa3D: return "mesa3d";
   case Contiki: return "contiki";
+  case AMDPAL: return "amdpal";
   }
 
   llvm_unreachable("Invalid OSType");
@@ -498,6 +499,7 @@
     .StartsWith("watchos", Triple::WatchOS)
     .StartsWith("mesa3d", Triple::Mesa3D)
     .StartsWith("contiki", Triple::Contiki)
+    .StartsWith("amdpal", Triple::AMDPAL)
     .Default(Triple::UnknownOS);
 }
 
Index: lib/Target/AMDGPU/AMDGPUSubtarget.h
===================================================================
--- lib/Target/AMDGPU/AMDGPUSubtarget.h
+++ lib/Target/AMDGPU/AMDGPUSubtarget.h
@@ -214,6 +214,10 @@
            TargetTriple.getEnvironmentName() == "amdgizcl";
   }
 
+  bool isAmdPalOS() const {
+    return TargetTriple.getOS() == Triple::AMDPAL;
+  }
+
   Generation getGeneration() const {
     return Gen;
   }