REGCTXT = REG_R11 /* context for closures */
	REGTLS  = REG_R13 /* C ABI TLS base pointer */
	REGMAX  = REG_R27
	REGEXT  = REG_R30 /* external registers allocated from here down */
	REGG    = REG_R30 /* G */
	REGTMP  = REG_R31 /* used by the linker */
	FREGRET = REG_F0
	FREGMIN = REG_F17 /* first register variable */
	FREGMAX = REG_F26 /* last register variable for 9g only */