some help with avr-gcc ssa tree

[Sandeep K Chaudhary <babbusandy2006@xxxxxxxxx>]

Hi guys,

For the following simple sample program

=================================
#include <avr/io.h>
int main( void )
                              {
PORTB   = 0xFF;
    DDRB    = 0x1;
}
================================

I get the following ssa form when doing "avr-gcc -mmcu=atmega8 -O3
-fdump-tree-all program.c"

-----------------------------------------------
;; Function main (main, funcdef_no=0, decl_uid=1495, cgraph_uid=0)

main ()
{
  volatile uint8_t * _1;
  volatile uint8_t * _4;

  <bb 2>:
  _1 = 56B;
  *_1 ={v} 255;
  _4 = 55B;
  *_4 ={v} 1;
  return;
}
--------------------------------------------------

When looking at this ssa tree through a gcc plugin, I wish to be able
to get the register names PORTB and DDRB when dealing with the
statements in basic block 2.

How can I do that? Can I somehow get back to the register names with
the help of 56B and 55B?

Please help me with it.

Thanks and regards,
Sandeep.