RE: QUery regarding target macros ELIMINABLE_REGS and CAN_ELIMINATE.

["venkat" <venkat at acmet dot com>]

Then please check INITIAL_ELIMINATION_OFFSET macro definitions.

(Snip from GCC internals)
This macro is similar to INITIAL_FRAME_POINTER_OFFSET. It specifies the
initial difference between the specified pair of registers. This macro must
be defined if ELIMINABLE_REGS is defined.
(Snip)

> -----Original Message-----
> From: gcc-help-owner@gcc.gnu.org [mailto:gcc-help-owner@gcc.gnu.org] On
> Behalf Of sumanth
> Sent: Wednesday, April 22, 2009 12:32 PM
> To: venkat
> Cc: 'gnu'
> Subject: Re: QUery regarding target macros ELIMINABLE_REGS and
> CAN_ELIMINATE.
> 
> hi venkat,
>                 and still the problem is same.
> venkat wrote:
> > I faced similar problem.
> >
> > I have set 'flag_omit_frame_pointer = TRUE' in the function written for
> the
> > macro OVERRIDE_OPTIONS.
> >
> >
> >
> >> -----Original Message-----
> >> From: gcc-help-owner@gcc.gnu.org [mailto:gcc-help-owner@gcc.gnu.org] On
> >> Behalf Of sumanth
> >> Sent: Wednesday, April 22, 2009 10:51 AM
> >> To: gnu
> >> Subject: QUery regarding target macros ELIMINABLE_REGS and
> CAN_ELIMINATE.
> >>
> >> Hi,
> >>     I have a doubt regarding target macros ELIMINABLE_REGS and
> >> CAN_ELIMINATE.
> >>     I defined eliminable regs as
> >>     #define ELIMINABLE_REGS  { \
> >>         {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM} , \
> >>         {FRAME_POINTER_REGNUM, HARD_FRAME_POINTER_REGNUM} , \
> >>         {HARD_FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM} }
> >>    and CAN_ELIMINATE(FROM, TO) as if it has to replace
> >> FRAME_POINTER_REGNUM  with HARD_FRAME_POINTER_REGNUM
> >>    whenever !(frame_pointer_needed).
> >>
> >>    But, my code generated is not according to CAN_ELIMINATE . It is not
> >> replacing FRAME_POINTER_REGNUM  with HARD_FRAME_POINTER_REGNUM.
> >>
> >>  Can any one point me to solution.
> >>
> >> Thanks in advance,
> >> Sumanth
> >>
> >
> >
> >
> >
> >