-pprUserReg = pprReg IF_ARCH_i386(II32,) IF_ARCH_x86_64(II64,)
-
-#else
-pprUserReg :: Reg -> Doc
-pprUserReg = panic "X86.Ppr.pprUserReg: not defined"
-
-#endif
+pprUserReg
+ | cTargetArch == I386 = pprReg II32
+ | cTargetArch == X86_64 = pprReg II64
+ | otherwise = panic "X86.Ppr.pprUserReg: not defined"