This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: Stack offset computation for incoming arguments.


> As advised given by you ,we defind the following marcos like
> 
> #define ARG_POINTER_REGNUM 9
> #define FRAME_POINTER_REGNUM 8

ARG_POINTER_REGNUM and FRAME_POINTER_REGNUM need to be pseudo-registers if 
they do not represent real registers.

> #define STACK_POINTER_REGNUM 10
> 
> 
> #define ELIMINABLE_REGS                                 \
>  {{ ARG_POINTER_REGNUM, STACK_POINTER_REGNUM},          \
>   { FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}        \
> 
> #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
>  (OFFSET) = tlcs_initial_elimination_offset (FROM, TO)
> 
> #define CAN_ELIMINATE 1
> 
> #define FIRST_PARM_OFFSET 3
> 
> With -O0 or by default options the frame and arg regs  are not
> replaced by stack reg and the  same  replaced  with -O1 and above
> optimisation.

Only pseudo-registers are always eliminated I think.

-- 
Eric Botcazou


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]