! X8 Indirect result location register
! X9 - X15 Temporary registers
! X16 - X17 Intra-procedure call temporary
-! X18 Platform register, otherwise temporary
+! X18 Platform register, otherwise temporary, DONT USE
! X19 - X29 Callee-saved register Must preserve
+! X29 - frame pointer register, must always be valid
! X30 Link Register Can Corrupt
+! 16-byte stack alignment
: arg1 ( -- reg ) X0 ;
: arg2 ( -- reg ) X1 ;
: arg3 ( -- reg ) X2 ;
: arg4 ( -- reg ) X3 ;
-: red-zone-size ( -- n ) 16 ;
+: red-zone-size ( -- n ) 128 ;
: shift-arg ( -- reg ) X1 ;
: div-arg ( -- reg ) X0 ;