Dear Eric,
Really Appreciate your reply here and made the following changes like
#define ARG_POINTER_REGNUM 8 //Fake hard reg
#define FRAME _POINTER_REGNUM 9 // Fake hard reg
#define SP_REG 10
#define ELIMINABLE_REGS { {ARG_POINTER_REGNUM,STACK_POINTER_REGNUM}, \
{ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
{FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM} }
The ARG and FRAME reg are not marked as fixed regs ,but marked as
call used regs respectively.
The reload pass is eliminating the arg and fp regs to sp ,when the
sample is run with -fomit-frame-pointer option, i.e
$t-gcc -S -fomit-frame-pointer sample.c
But without the –fomit-frame-pointer option the arg and fp is not
replaced with sp.
Please help us regrading with any hints ??
Thank you
~Umesh
On Fri, May 30, 2014 at 4:24 PM, Eric Botcazou <ebotca...@adacore.com> wrote:
>> ARG_POINTER_REGNUM and FRAME_POINTER_REGNUM need to be pseudo-registers if
>> they do not represent real registers.
>
> The wording "pseudo registers" is obviously a bit confusing in this context...
>
> If ARG_POINTER_REGNUM and FRAME_POINTER_REGNUM do not represent real registers
> then they need to be fake hard registers, i.e. hard registers according to the
> FIRST_PSEUDO_REGISTER macro but with an arbitrary REGNUM (typically just below
> the FIRST_PSEUDO_REGISTER macro). See the numerous examples in the tree.
>
> --
> Eric Botcazou
