Abt RTL expression

[Mohamed Shafi]

hello all,

Sorry i am asking this kind of question.This might be weird to most of you but 
i am new to GCC.
Can somebody tell me how to analyze the below instruction pattern

(insn 8 6 9 1 (parallel [
            (set (reg/f:SI 32)
                (symbol_ref:SI ("t") <var_decl 0x402270b0 t>))
            (clobber (reg:CC 21 cc))
        ]) -1 (nil)
    (nil))

Will i be able to find this pattern in .md files?
what does insn 8 6 9 1 mean?
reg/f ?
 for varible declaration why is it needed to clobber CC?

Hope somebody will help me.

Thanks in advance.

Regards,
Shafi