Index: lib/Target/AMDGPU/SIRegisterInfo.cpp
===================================================================
--- lib/Target/AMDGPU/SIRegisterInfo.cpp
+++ lib/Target/AMDGPU/SIRegisterInfo.cpp
@@ -1122,6 +1122,8 @@
 unsigned SIRegisterInfo::getNumReservedSGPRs(const SISubtarget &ST) const {
   if (ST.getGeneration() >= AMDGPUSubtarget::VOLCANIC_ISLANDS)
     return 6; // VCC, FLAT_SCRATCH, XNACK.
+  if (ST.getGeneration() >= AMDGPUSubtarget::SEA_ISLANDS)
+    return 4; // VCC, FLAT_SCRATCH.
   return 2; // VCC.
 }