rtx structure

[Bharati Bhole]

On 11/2/06, Daniel Berlin <dberlin@dberlin.org> wrote:
> > I want to know what part of rtx each field in this structure stores.
> > While tracing through gdb i tried to print the rtx, and i was not able
> > to understand that. Could u please explain me it with a sample RTX
> > that what value these fields have.
> >
>
> The macros used to access the rtl fields in rtl.h explain what part of
> each field they access and what they treat that object as.
>
> The definitions of rtl in rtl.def define what each portion of a piece
> of valid RTL is structured as.
> > Bharati.
> >
>

I have gone through the structure but i still dont get it.
Could anybody please tell me, if the following insn is  a sample insn,
how will the rtx structure look like -
        (define_insn "subsi3_carry_zext"
        [(set (match_operand:DI 0 "register_operand" "=rm,r")
                 (zero_extend:DI
	          (minus:SI (match_operand:SI 1 "register_operand" "0,0")
                          (plus:SI (match_operand:SI 3
"ix86_carry_flag_operator" "")
                              (match_operand:SI 2 "general_operand" "ri,rm")))))
          (clobber (reg:CC FLAGS_REG))]
       "TARGET_64BIT && ix86_binary_operator_ok (MINUS, SImode, operands)"
       "sbb{l}\t{%2, %k0|%k0, %2}"
      [(set_attr "type" "alu")
      (set_attr "pent_pair" "pu")
      (set_attr "mode" "SI")])

Bharati.