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RTL help needed


hi all
I need to learn RTL .but the documentation given in the gcc site
is not clear and vivid.Can some one explain me the following RTL
code so that I can extend them to other programs and learn them myself

the c code
=======================
#include<stdio.h>
main()
{
	int a=10;
}
=======================


the corresponding RTL code
********************************************************

 ;; Function main
      
       (note 2 0 6 NOTE_INSN_DELETED)
      
       (insn 6 2 8 (parallel[ (set (reg/f:SI 7 esp) (and:SI (reg/f:SI 7 
esp)    (const_int -16 [0xfffffff0])))
                   (clobber (reg:CC 17 flags))
                   ] ) -1 (nil)
          (nil))
     
      (insn 8 6 10 (set (reg:SI 59) (const_int 0 [0x0])) -1 (nil)
          (expr_list:REG_EQUAL (const_int 0 [0x0])
              (nil)))
     
      (insn 10 8 12 (parallel[ (set (reg/f:SI 7 esp) (minus:SI (reg/f:SI 
7 esp) (reg:SI 59)))
                  (clobber (reg:CC 17 flags))
              ] ) -1 (nil)
          (nil))
     
      (insn 12 10 3 (set (reg/f:SI 60) (reg/f:SI 55 
virtual-stack-dynamic)) -1 (nil)
          (nil))
     
      (note 3 12 4 NOTE_INSN_FUNCTION_BEG)
     
      (note 4 3 13 NOTE_INSN_DELETED)
     
      (note 13 4 14 0x401bc680 NOTE_INSN_BLOCK_BEG)
     
      (note 14 13 17 NOTE_INSN_DELETED)
     
      (insn 17 14 18 (set (mem/f:SI (plus:SI (reg/f:SI 54 
virtual-stack-vars) (const_int -4 [0xfffffffc])) [0 a+0 S4 A32])
              (const_int 10 [0xa])) -1 (nil)
          (nil))
     
      (note 18 17 19 0x401bc680 NOTE_INSN_BLOCK_END)
     
      (note 19 18 24 NOTE_INSN_FUNCTION_END)
     
      (insn 24 19 25 (clobber (reg/i:SI 0 eax)) -1 (nil)
          (nil))
     
      (insn 25 24 21 (clobber (reg:SI 58)) -1 (nil)
         (nil))
     
      (code_label 21 25 23 1 "" "" [0 uses])
     
      (insn 23 21 26 (set (reg/i:SI 0 eax) (reg:SI 58)) -1 (nil)
          (nil))
     
      (insn 26 23 0 (use (reg/i:SI 0 eax)) -1 (nil)
          (nil))

************************************************************

thnks in advance
-- 


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