Re: QUery regarding target macros ELIMINABLE_REGS and CAN_ELIMINATE.

sumanth <sumanth.gundapneni@xxxxxxxxxxxxxxxxxx> · Wed, 22 Apr 2009 12:31:32 +0530

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@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] 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