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Re: virtual stack regs.
- From: "Seongbae Park (박성배, 朴成培)" <seongbae dot park at gmail dot com>
- To: "Rask Ingemann Lambertsen" <rask at sygehus dot dk>
- Cc: "Kenneth Zadeck" <zadeck at naturalbridge dot com>, ubizjak at gmail dot com, gcc at gcc dot gnu dot org
- Date: Tue, 19 Jun 2007 09:05:35 -0700
- Subject: Re: virtual stack regs.
- References: <46772329.5010500@naturalbridge.com> <20070619090455.GH5690@sygehus.dk>
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
--
#pragma ident "Seongbae Park, compiler, http://seongbae.blogspot.com";