Re: rtx structure

["Bharati Bhole" <bharati dot bhole at gmail dot com>]

On 01 Nov 2006 08:14:36 -0800, Ian Lance Taylor <iant@google.com> wrote:
> "Bharati Bhole" <bharati.bhole@gmail.com> writes:
>
> > I am not able to understand the structure of rtx_def fully its too complicated.
> > Could anybody please guide me. Its defined in rtl.h.
> > struct rtx_def GTY((chain_next ("RTX_NEXT (&%h)"),
> >                     chain_prev ("RTX_PREV (&%h)")))
> > {
> >    ENUM_BITFIELD(rtx_code) code: 16;
> >   ENUM_BITFIELD(machine_mode) mode : 8;
> >   unsigned int jump : 1;
> >   unsigned int call : 1;
> >   unsigned int unchanging : 1;
> >   unsigned int volatil : 1;
> >   unsigned int in_struct : 1;
> >    unsigned int used : 1;
> >   unsigned frame_related : 1;
> >   unsigned return_val : 1;
> >   union u {
> >     rtunion fld[1];
> >     HOST_WIDE_INT hwint[1];
> >   } GTY ((special ("rtx_def"), desc ("GET_CODE (&%0)"))) u;
> > };
>
> What is your specific question?
>
> The GTY construct is documented in gcc/doc/gty.texi.  Everything else
> is pretty standard.  You can find the definition of ENUM_BITFIELD by
> using grep.
>
> Ian

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.

Bharati.