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Re: virtual stack regs.

From: Paolo Bonzini <bonzini at gnu dot org>
To: "Seongbae Park (ëìë, ææå)" <seongbae dot park at gmail dot com>
Cc: Rask Ingemann Lambertsen <rask at sygehus dot dk>, Kenneth Zadeck <zadeck at naturalbridge dot com>, ubizjak at gmail dot com, gcc at gcc dot gnu dot org
Date: Wed, 20 Jun 2007 07:14:43 +0200
Subject: Re: virtual stack regs.
References: <46772329.5010500@naturalbridge.com> <20070619090455.GH5690@sygehus.dk> <ab3a61990706190905o685d8d46o46a38a04091bdbed@mail.gmail.com>

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.

I think we should assert that we don't find virtual regs in dataflow, instead.

Paolo

References:
- virtual stack regs.
  - From: Kenneth Zadeck
- Re: virtual stack regs.
  - From: Rask Ingemann Lambertsen
- Re: virtual stack regs.
  - From: Seongbae Park (박성배, 朴成培)

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