Index: lib/Target/AMDGPU/SIRegisterInfo.cpp
===================================================================
--- lib/Target/AMDGPU/SIRegisterInfo.cpp
+++ lib/Target/AMDGPU/SIRegisterInfo.cpp
@@ -348,7 +348,8 @@
     &AMDGPU::SReg_128RegClass,
     &AMDGPU::VReg_256RegClass,
     &AMDGPU::SReg_256RegClass,
-    &AMDGPU::VReg_512RegClass
+    &AMDGPU::VReg_512RegClass,
+    &AMDGPU::SReg_512RegClass
   };
 
   for (const TargetRegisterClass *BaseClass : BaseClasses) {