diff --git a/llvm/lib/Target/Sparc/SparcRegisterInfo.td b/llvm/lib/Target/Sparc/SparcRegisterInfo.td
--- a/llvm/lib/Target/Sparc/SparcRegisterInfo.td
+++ b/llvm/lib/Target/Sparc/SparcRegisterInfo.td
@@ -126,6 +126,7 @@
 def WSTATE : SparcCtrlReg<14, "WSTATE">;
 
 // Integer registers
+let isConstant = true in
 def G0 : Ri< 0, "G0">, DwarfRegNum<[0]>;
 def G1 : Ri< 1, "G1">, DwarfRegNum<[1]>;
 def G2 : Ri< 2, "G2">, DwarfRegNum<[2]>;