From: Jeffrey A Law <law@cygnus.com>
To: Richard Henderson <rth@cygnus.com>
Cc: Jim Wilson <wilson@cygnus.com>, kkaempf@progis.de, egcs@cygnus.com
Subject: Re: egcs 2.91.14: packed-1 failure on openvms/alpha, more info
Date: Mon, 30 Mar 1998 16:18:00 -0000 [thread overview]
Message-ID: <7059.891298872@hurl.cygnus.com> (raw)
In-Reply-To: <19980330145218.21981@dot.cygnus.com>
In message < 19980330145218.21981@dot.cygnus.com >you write:
> On Thu, Mar 26, 1998 at 04:33:54PM -0700, Jeffrey A Law wrote:
> > Who knows, that code might even be totally useless now that we
> > propagate alias information better.
>
> Is that the same code that records "known alignment" of pointers
> in registers? That information is still useful, though the way
> we keep track of it seems truely ugly.
I don't think it records known alignment at that particular time;
just the fact that if A is a pointer, then A + C is a pointer
(not strictly true, but for most machines that's good enough).
It may be the case that we propagate alignment stuff after we
set REGNO_POINTER_FLAG on these "derived" pointers, but I haven't
looked.
That is something we might want to do as part of the alias analysis
code though....
jeff
next prev parent reply other threads:[~1998-03-30 16:18 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1998-03-18 14:08 kkaempf
1998-03-25 17:22 ` Jim Wilson
1998-03-27 15:18 ` Jeffrey A Law
1998-03-26 14:38 ` Jim Wilson
1998-03-26 18:14 ` Jeffrey A Law
1998-03-30 16:18 ` Richard Henderson
1998-03-30 16:18 ` Jeffrey A Law [this message]
1998-04-02 11:32 ` Jim Wilson
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