virtual stack regs.

[Seongbae Park (박성배, 朴成培)]

On 6/19/07, Rask Ingemann Lambertsen <rask@sygehus.dk> wrote:
..
>    Hmm, how do you handle arg_pointer_rtx, frame_pointer_rtx and the like?
> The are all uninitialized until the prologue is emitted, which is some time
> after reload.

ARG_POINTER_REGNUM is included in the artificial defs of all blocks
(which I think is overly conservative - just having them
in the entry block def should be enough).
Hence, from dataflow point of view, they are always considered initialized.

I think we should probably do something similar
for VIRTUAL_STACK_*_REGNUM.

> > 5) How can I tell if a reg is a virtual_stack_reg?
>
>    FIRST_VIRTUAL_REGISTER <= regno <= LAST_VIRTUAL_REGISTER
>
> --
> Rask Ingemann Lambertsen

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